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These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance for more information. Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher. Annualized.The returns shown for periods prior to October 2, 2024 (including Since Fund Inception returns, if shown) include the returns of Class A. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. 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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES
Investment Company Act file number
811-21852
Columbia Funds Series Trust II
(Exact name of registrant as specified in charter)

290 Congress Street
Boston, MA 02210
(Address of principal executive offices) (Zip code)

Daniel J. Beckman
c/o Columbia Management Investment Advisers, LLC
290 Congress Street
Boston, MA 02210

Ryan C. Larrenaga, Esq.
c/o Columbia Management Investment Advisers, LLC
290 Congress Street
Boston, MA 02210

(Name and address of agent for service)
Registrant's telephone number, including area code:
(800) 345-6611
Date of fiscal year end:
Last Day of
 
May
Date of reporting period:
May 31, 2025
Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles.
A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 100
 
F Street, NE, Washington, DC 20549. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.
Item 1. Reports to Stockholders
Columbia Mortgage Opportunities Fund
Class A / CLMAX
FundLogo
Annual Shareholder Report | May 31, 2025
This annual shareholder report contains important information about Columbia Mortgage Opportunities Fund (the Fund) for the period of June 1, 2024 to May 31, 2025. You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
112
1.06
%
Management's Discussion of Fund Performance
The performance of Class A shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Fund Performance
The following shows the change in value of a hypothetical $10,000 investment in Class A shares of the Fund during the stated time period.
Growth of $10,000
Fund Performance - Growth of 10K
Average Annual Total Returns (%)1 year5 years10 years
Class A (excluding sales charges)12.793.513.54
Class A (including sales charges)9.422.883.22
FTSE One-Month U.S. Treasury Bill Index4.902.761.92
Bloomberg U.S. Aggregate Bond Index5.46(0.90
)
1.49
The Fund's past performance is not a good predictor of the Fund's future performance.
 Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. Performance results reflect the effect of any fee waivers/expense reimbursements, if applicable. All results shown assume reinvestment of distributions. Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Key Fund Statistics
Fund net assets
$
2,180,670,766
Total number of portfolio holdings
445
Management services fees
(represents 0.64% of Fund average net assets)
$
14,345,650
Portfolio turnover for the reporting period
706%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
26%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Derivative Exposure
Long
Credit Risk8.2
%
Interest Rate Risk110.7
%
Short
Credit Risk4.6
%
Interest Rate Risk283.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax inf
orm
ation and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Mortgage Opportunities Fund | Class A
 
|
 
ASR251_01_(07/25)
Columbia Mortgage Opportunities Fund
Class C / CLMCX
FundLogo
Annual Shareholder Report | May 31, 2025
This annual shareholder report contains important information about Columbia Mortgage Opportunities Fund (the Fund) for the period of June 1, 2024 to May 31, 2025. You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class C
$
191
1.81
%
Management's Discussion of Fund Performance
The performance of Class C shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Fund Performance
The following shows the change in value of a hypothetical $10,000 investment in Class C shares of the Fund during the stated time period.
Growth of $10,000
Fund Performance - Growth of 10K
Average Annual Total Returns (%)1 year5 years10 years
Class C (excluding sales charges)11.822.712.75
Class C (including sales charges)10.82 2.71 2.75
FTSE One-Month U.S. Treasury Bill Index4.902.761.92
Bloomberg U.S. Aggregate Bond Index5.46 (0.90
)
1.49
The Fund's past performance is not a good predictor of the Fund's future performance.
 Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. Performance results reflect the effect of any fee waivers/expense reimbursements, if applicable. All results shown assume reinvestment of distributions. Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Key Fund Statistics
Fund net assets
$
2,180,670,766
Total number of portfolio holdings
445
Management services fees
(represents 0.64% of Fund average net assets)
$
14,345,650
Portfolio turnover for the reporting period
706%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
26%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Derivative Exposure
Long
Credit Risk8.2
%
Interest Rate Risk110.7
%
Short
Credit Risk4.6
%
Interest Rate Risk283.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial in
formati
on, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Mortgage Opportunities Fund | Class C
 
|
 
ASR251_04_(07/25)
Columbia Mortgage Opportunities Fund
Institutional Class / CLMZX
FundLogo
Annual Shareholder Report | May 31, 2025
This annual shareholder report contains important information about Columbia Mortgage Opportunities Fund (the Fund) for the period of June 1, 2024 to May 31, 2025. You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
86
0.81
%
Management's Discussion of Fund Performance
The performance of Institutional Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Fund Performance
The following shows the change in value of a hypothetical $10,000 investment in Institutional Class shares of the Fund during the stated time period.
Growth of $10,000
Fund Performance - Growth of 10K
Average Annual Total Returns (%)1 year5 years10 years
Institutional Class12.943.753.78
FTSE One-Month U.S. Treasury Bill Index4.902.761.92
Bloomberg U.S. Aggregate Bond Index5.46(0.90
)
1.49
The Fund's past performance is not a good predictor of the Fund's future performance.
 Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. Performance results reflect the effect of any fee waivers/expense reimbursements, if applicable. All results shown assume reinvestment of distributions. Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Key Fund Statistics
Fund net assets
$
2,180,670,766
Total number of portfolio holdings
445
Management services fees
(represents 0.64% of Fund average net assets)
$
14,345,650
Portfolio turnover for the reporting period
706%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
26%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of F
u
nd net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Derivative Exposure
Long
Credit Risk8.2
%
Interest Rate Risk110.7
%
Short
Credit Risk4.6
%
Interest Rate Risk283.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Mortgage Opportunities Fund | Institutional Class
 
|
 
ASR251_08_(07/25)
Columbia Mortgage Opportunities Fund
Institutional 2 Class / CLMVX
FundLogo
Annual Shareholder Report | May 31, 2025
This annual shareholder report contains important information about Columbia Mortgage Opportunities Fund (the Fund) for the period of June 1, 2024 to May 31, 2025. You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
82
0.77
%
Management's Discussion of Fund Performance
The performance of Institutional 2 Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Fund Performance
The following shows the change in value of a hypothetical $10,000 investment in Institutional 2 Class shares of the Fund during the stated time period.
Growth of $10,000
Fund Performance - Growth of 10K
Average Annual Total Returns (%)1 year5 years10 years
Institutional 2 Class13.013.773.82
FTSE One-Month U.S. Treasury Bill Index4.902.761.92
Bloomberg U.S. Aggregate Bond Index5.46(0.90
)
1.49
The Fund's past performance is not a good predictor of the Fund's future performance.
 Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. Performance results reflect the effect of any fee waivers/expense reimbursements, if applicable. All results shown assume reinvestment of distributions. Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Key Fund Statistics
Fund net assets
$
2,180,670,766
Total number of portfolio holdings
445
Management services fees
(represents 0.64% of Fund average net assets)
$
14,345,650
Portfolio turnover for the reporting period
706%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
26%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of
Fu
nd net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Derivative Exposure
Long
Credit Risk8.2
%
Interest Rate Risk110.7
%
Short
Credit Risk4.6
%
Interest Rate Risk283.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Mortgage Opportunities Fund | Institutional 2 Class
 
|
 
ASR251_15_(07/25)
Columbia Mortgage Opportunities Fund
Institutional 3 Class / CMOYX
FundLogo
Annual Shareholder Report | May 31, 2025
This annual shareholder report contains important information about Columbia Mortgage Opportunities Fund (the Fund) for the period of June 1, 2024 to May 31, 2025. You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
76
0.72
%
Management's Discussion of Fund Performance
The performance of Institutional 3 Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Fund Performance
The following shows the change in value of a hypothetical $10,000 investment in Institutional 3 Class shares of the Fund during the stated time period.
Growth of $10,000
Fund Performance - Growth of 10K
Average Annual Total Returns (%)1 year5 years10 years
Institutional 3
Class
(a)
13.043.843.82
FTSE One-Month U.S. Treasury Bill Index4.902.761.92
Bloomberg U.S. Aggregate Bond Index5.46(0.90
)
1.49
(a)
The returns shown for periods prior to March 1, 2017 (including Since Fund Inception returns, if shown) include the returns of Class A. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance
for more information.
The Fund's past performance is not a good predictor of the Fund's future performance.
 Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. Performance results reflect the effect of any fee waivers/expense reimbursements, if applicable. All results shown assume reinvestment of distributions. Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Key Fund Statistics
Fund net assets
$
2,180,670,766
Total number of portfolio holdings
445
Management services fees
(represents 0.64% of Fund average net assets)
$
14,345,650
Portfolio turnover for the reporting period
706%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
26%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Deriv
ativ
es are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Derivative Exposure
Long
Credit Risk8.2
%
Interest Rate Risk110.7
%
Short
Credit Risk4.6
%
Interest Rate Risk283.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Mortgage Opportunities Fund | Institutional 3 Class
 
|
 
ASR251_17_(07/25)
Columbia Mortgage Opportunities Fund
Class S / CLMDX
FundLogo
Annual Shareholder Report | May 31, 2025
This annual shareholder report contains important information about Columbia Mortgage Opportunities Fund (the Fund) for the period of October 2, 2024 to May 31, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
54
(a)
0.81
%
(b)
(a)
Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
(b)
Annualized.
Management's Discussion of Fund Performance
The performance of Class S shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Fund Performance
The following shows the change in value of a hypothetical $10,000 investment in Class S shares of the Fund during the stated time period.
Growth of $10,000
Fund Performance - Growth of 10K
Average Annual Total Returns (%)1 year5 years10 years
Class
S
(a)
12.843.523.54
FTSE One-Month U.S. Treasury Bill Index4.902.761.92
Bloomberg U.S. Aggregate Bond Index5.46(0.90
)
1.49
(a)
The returns shown for periods prior to October 2, 2024 (including Since Fund Inception returns, if shown) include the returns of Class A. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance
for more information.
The Fund's past performance is not a good predictor of the Fund's future performance.
 Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares. Performance results reflect the effect of any fee waivers/expense reimbursements, if applicable. All results shown assume reinvestment of distributions. Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Key Fund Statistics
Fund net assets
$
2,180,670,766
Total number of portfolio holdings
445
Management services fees
(represents 0.64% of Fund average net assets)
$
14,345,650
Portfolio turnover for the reporting period
706%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
26%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Derivative Exposure
Long
Credit Risk8.2
%
Interest Rate Risk110.7
%
Short
Credit Risk4.6
%
Interest Rate Risk283.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial inf
orma
tion, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Mortgage Opportunities Fund | Class S
 
|
 
ASR251_16_(07/25)

Item 2. Code of Ethics.

The registrant has adopted a code of ethics (the “Code”) that applies to the registrant’s principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party. During the period covered by this report, there were not any amendments to a provision of the Code that relates to any element of the code of ethics definition enumerated in paragraph (b) of Item 2 of Form N-CSR. During the period covered by this report, there were no waivers, including any implicit waivers, from a provision of the Code that relates to one or more of the items set forth in paragraph (b) of Item 2 of Form N-CSR. A copy of the Code is attached hereto.


Item 3. Audit Committee Financial Expert.

The registrant’s Board of Trustees has determined that J. Kevin Connaughton, Brian J. Gallagher, Douglas A. Hacker, David M. Moffett and Sandra L. Yeager qualify as “audit committee financial experts,” as such term is defined in Form N-CSR. Mr. Connaughton, Mr. Gallagher, Mr. Hacker, Mr. Moffett and Ms. Yeager, are also each “independent” members of the Audit Committee pursuant to paragraph (a)(2) of Item 3 of Form N-CSR.


Item 4. Principal Accountant Fees and Services.

The Registrant has engaged its principal accountant to perform audit services, audit-related services, tax services and other services during the past two fiscal years. The following table details the aggregate fees billed or expected to be billed for each of the last two fiscal years for the series of the relevant registrant whose reports to shareholders are included in this annual filing.

Amount billed to the registrant ($) Amount billed to the registrant's
investment advisor ($)
May 31, 2025 May 31, 2024 May 31, 2025 May 31, 2024
Audit fees (a) 53,156 52,505 0 0
Audit-related fees (b) 0 0 0 0
Tax fees (c) 13,795 12,850 0 0
All other fees (d) 0 0 0 0
Non-audit fees (g) 0 0 474,000 581,000

(a)    Audit Fees include amounts related to the audit of the registrant’s annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years.

(b)    Audit-Related Fees include amounts for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant’s financial statements and are not reported in Audit Fees above.

(c)    Tax Fees include amounts for the review of annual tax returns, the review of required shareholder distribution calculations and typically include amounts for professional services by the principal accountant for tax compliance, tax advice, tax planning and foreign tax filings, if applicable.

(d)    All Other Fees include amounts for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) above and typically include SOC-1 reviews.

(e)(1) Audit Committee Pre-Approval Policies and Procedures
The registrant’s Audit Committee is required to pre-approve the engagement of the registrant’s independent auditors to provide audit and non-audit services to the registrant and non-audit services to its investment adviser (excluding any sub-adviser whose role is primarily portfolio management and is sub-contracted or overseen by another investment adviser (the “Adviser”) or any entity controlling, controlled by or under common control with the Adviser that provides ongoing services to the Fund (a “Control Affiliate”) if the engagement relates directly to the operations and financial reporting of the registrant.

The Audit Committee has adopted a Policy for Engagement of Independent Auditors for Audit and Non-Audit Services (the “Policy”). The Policy sets forth the understanding of the Audit Committee regarding the engagement of the registrant’s independent accountants to provide (i) audit and permissible audit-related, tax and other services to the registrant (“Fund Services”); (ii) non-audit services to the registrant’s Adviser and any Control Affiliates, that relates directly to the operations and financial reporting of a Fund (“Fund-related Adviser Services”); and (iii) certain other audit and non-audit services to the registrant’s Adviser and its Control Affiliates. A service will require specific pre-approval by the Audit Committee if it is to be provided by the Fund’s independent auditor; provided, however, that pre-approval of non-audit services to the Fund, the Adviser or Control Affiliates may be waived if certain de minimis requirements set forth in the SEC’s rules are met.

Under the Policy, the Audit Committee may delegate pre-approval authority to any pre-designated member or members who are independent board members.  The member(s) to whom such authority is delegated must report, for informational purposes only, any pre-approval decisions to the Audit Committee at its next regular meeting. The Audit Committee's responsibilities with respect to the pre-approval of services performed by the independent auditor may not be delegated to management.

On an annual basis, at a regularly scheduled Audit Committee meeting, the Fund’s Treasurer or other Fund officer shall submit to the Audit Committee a schedule of the types of Fund Services and Fund-related Adviser Services that are subject to specific pre-approval. This schedule will provide a description of each type of service that is subject to specific pre-approval, along with total projected fees for each service.  The pre-approval will generally cover a one-year period. The Audit Committee will review and approve the types of services and the projected fees for the next one-year period and may add to, or subtract from, the list of pre-approved services from time to time, based on subsequent determinations.  This specific approval acknowledges that the Audit Committee is in agreement with the specific types of services that the independent auditor will be permitted to perform and the projected fees for each service.

The Fund’s Treasurer or other Fund officer shall report to the Audit Committee at each of its regular meetings regarding all Fund Services or Fund-related Adviser Services provided since the last such report was rendered, including a description of the services, by category, with forecasted fees for the annual reporting period, proposed changes requiring specific pre-approval and a description of services provided by the independent auditor, by category, with actual fees during the current reporting period.

(e)(2) None, or 0%, of the Audit-Related Fees, Tax Fees and All Other Fees paid by the Fund or affiliated entities relating directly to the operations and financial reporting of the Registrant disclosed above were approved by the audit committee pursuant to paragraphs (c)(7)(i)(C) of Rule 2-01 of Regulation S-X (which permits audit committee approval after the start of the engagement with respect to services other than audit, review or attest services, if certain conditions are satisfied).

(f)    Not applicable.

(g)    The aggregate non-audit fees billed by the registrant’s accountant for services rendered to the registrant and rendered to the registrant’s investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant.

(h)    The registrant’s Audit Committee of the Board of Directors has considered whether the provision of non-audit services that were rendered to the registrant’s adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X, is compatible with maintaining the principal accountant’s independence.

(i)    Not applicable.

(j)    Not applicable.


Item 5. Audit Committee of Listed Registrants.

Not applicable.


Item 6. Investments.

(a) The registrant’s “Schedule I – Investments in securities of unaffiliated issuers” (as set forth in 17 CFR 210.12-12) is included in Item 7 of this Form N-CSR.

(b) Not applicable.


Item 7. Financial Statements and Financial Highlights for Open-End Management Investment Companies.


  
Columbia Mortgage Opportunities Fund
Annual Financial Statements and Additional Information
May 31, 2025 
  
Not FDIC or NCUA Insured
No Financial Institution Guarantee
May Lose Value

Table of Contents
 
3
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50
Columbia Mortgage Opportunities Fund | 2025

Portfolio of Investments
May 31, 2025
(Percentages represent value of investments compared to net assets)
Investments in securities
 
 
Asset-Backed Securities - Non-Agency 10.3%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Affirm Asset Securitization Trust(a),(b),(c)
Series 2024-X2 Class CERT
12/17/2029
0.000%
 
70,500
3,706,537
ARES CLO(a),(d)
Series 2021-60A Class E
3-month Term SOFR +
6.512%
Floor 6.250%
07/18/2034
10.781%
 
5,000,000
5,021,295
ARES XLIV CLO Ltd.(a),(d)
Series 2017-44A Class DR
3-month Term SOFR +
7.132%
Floor 6.870%
04/15/2034
11.388%
 
5,275,000
5,301,760
ASP WHCO Participation LP(a),(d),(e)
30-day Average SOFR +
2.400%
Floor 3.000%
03/29/2029
6.713%
 
18,000,000
18,000,000
Carlyle Global Market Strategies CLO Ltd.(a),(d)
Series 2013-3A Class BR
3-month Term SOFR +
1.962%
Floor 1.700%
10/15/2030
6.218%
 
11,000,000
11,006,864
Series 2015-4A Class CR
3-month Term SOFR +
3.962%
Floor 3.700%
07/20/2032
8.231%
 
7,500,000
7,511,227
EDGEX Issuer Trust(a)
Series 2025-1NN Class B
01/15/2031
6.850%
 
6,537,500
6,490,421
EDGEX Issuer Trust(a),(c)
Series 2025-1NN Class CERT
01/15/2031
0.000%
 
8,358,000
8,174,404
Elmwood CLO VIII Ltd.(a),(d)
Series 2024-1A Class ER
3-month Term SOFR +
6.250%
Floor 6.250%
04/20/2037
10.520%
 
2,500,000
2,476,877
LendingClub Receivables Trust(a),(c),(e)
Series 2020-2 Class R
02/15/2046
0.000%
 
865,000
86,500
LendingPoint Asset Securitization Trust(a),(e),(f)
Subordinated Series 2021-1 Class D
04/15/2027
7.226%
 
1,813,435
1,810,171
Asset-Backed Securities - Non-Agency (continued)
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Marlette Funding Trust(a)
Series 2021-1A Class D
06/16/2031
2.470%
 
212,314
210,811
MPOWER Education Trust(a)
Series 2025-A Class B
07/21/2042
8.470%
 
6,480,000
6,574,023
Subordinated Series 2024-A Class B
07/22/2041
8.350%
 
6,000,000
6,122,659
NetCredit Combined Receivables A LLC(a),(e)
Series 2025-A Class A
10/20/2031
7.290%
 
12,500,000
12,499,375
Netcredit Combined Receivables LLC(a)
Series 2023-A Class A
12/20/2027
7.780%
 
1,372,471
1,381,421
Octagon 54 Ltd.(a),(d)
Series 2021-1A Class E
3-month Term SOFR +
6.512%
Floor 6.250%
07/15/2034
10.768%
 
2,500,000
2,316,605
Oportun Funding Trust(a)
Subordinated Series 2024-3 Class C
08/15/2029
6.250%
 
1,800,000
1,804,499
Pagaya AI Debt Grantor Trust(a)
Subordinated Series 2024-5 Class C
10/15/2031
7.270%
 
4,837,561
4,880,412
Subordinated Series 2024-9 Class D
03/15/2032
6.174%
 
10,611,460
10,589,507
Pagaya AI Debt Selection Trust(a),(c)
Series 2020-3 Class CERT
05/17/2027
0.000%
 
23,803,550
392,468
Series 2021-1 Class CERT
11/15/2027
0.000%
 
1,901,904
0
Subordinated Series 2021-3 Class
05/15/2029
0.000%
 
12,925,852
402,601
Subordinated Series 2021-5 Class
08/15/2029
0.000%
 
12,321,273
416,822
Pagaya AI Debt Selection Trust(a)
Series 2021-2 Class NOTE
01/25/2029
3.000%
 
907,832
898,583
Pagaya AI Debt Trust(a),(g)
Series 2022-2 Class AB
01/15/2030
5.717%
 
97,353
97,389
Pagaya AI Debt Trust(a)
Series 2023-3 Class A
12/16/2030
7.600%
 
59,762
59,825
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
3

Portfolio of Investments (continued)
May 31, 2025
Asset-Backed Securities - Non-Agency (continued)
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Series 2023-6 Class D
06/16/2031
9.000%
 
10,909,752
11,006,269
Series 2025-R1 Class E
06/15/2032
12.105%
 
1,000,000
999,369
Subordinated Series 2022-2 Class B
01/15/2030
6.630%
 
333,067
333,284
Subordinated Series 2022-3 Class B
03/15/2030
8.050%
 
1,467,434
1,468,951
Subordinated Series 2022-5 Class B
06/17/2030
10.310%
 
4,057,914
4,215,788
Subordinated Series 2023-3 Class B
12/16/2030
9.570%
 
5,130,527
5,155,652
Subordinated Series 2023-7 Class B
07/15/2031
7.549%
 
881,584
882,808
Subordinated Series 2024-1 Class B
07/15/2031
7.109%
 
3,043,610
3,078,888
Subordinated Series 2024-1 Class C
07/15/2031
8.344%
 
2,213,115
2,239,884
Subordinated Series 2024-2 Class C
08/15/2031
7.573%
 
3,024,224
3,051,871
Subordinated Series 2024-3 Class B
10/15/2031
6.571%
 
5,486,604
5,539,959
Subordinated Series 2024-3 Class C
10/15/2031
7.297%
 
8,224,728
8,281,274
PAGAYA AI Debt Trust(a),(g)
Subordinated Series 2022-3 Class AB
03/15/2030
7.576%
 
958,129
959,119
Pagaya Point of Sale Holdings Grantor Trust(a)
Series 2025-1 Class A
01/20/2034
5.715%
 
8,200,000
8,225,625
Palmer Square CLO Ltd.(a),(d)
Series 2023-2A Class ER
3-month Term SOFR +
6.400%
07/20/2038
0.000%
 
2,000,000
2,008,036
Prosper Marketplace Issuance Trust(a)
Series 2024-1A Class A
08/15/2029
6.120%
 
1,451,287
1,453,400
Research-Driven Pagaya Motor Asset Trust IV(a)
Series 2021-2A Class A
03/25/2030
2.650%
 
3,459,917
3,379,461
RR 16 Ltd.(a),(d)
Series 2021-16A Class D
3-month Term SOFR +
6.512%
Floor 6.250%
07/15/2036
10.768%
 
3,733,333
3,714,957
Asset-Backed Securities - Non-Agency (continued)
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Theorem Funding Trust(a)
Series 2022-3A Class A
04/15/2029
7.600%
 
873,735
875,912
Upstart Asset Trust II Series(a),(c),(e),(f)
Series 2025-1GS Class CERT
02/20/2030
0.000%
 
49,723
17,106,204
Upstart Pass-Through Trust(a)
Series 2021-ST1 Class A
02/20/2027
2.750%
 
47,265
47,184
Upstart Securitization Trust(a)
Series 2025-1 Class C
04/20/2035
9.270%
 
10,850,000
10,623,399
Subordinated Series 2024-1 Class C
11/20/2034
8.680%
 
12,250,000
12,534,722
US Auto Funding(a)
Subordinated Series 2021-1A Class D
03/15/2027
4.360%
 
2,375,000
50,954
Total Asset-Backed Securities — Non-Agency
(Cost $242,752,621)
225,466,026
 
Commercial Mortgage-Backed Securities - Agency 0.2%
 
 
 
 
 
Government National Mortgage Association(g),(h)
Series 2017-30 Class IO
08/16/2058
0.573%
 
40,514,930
1,045,706
Series 2019-102 Class IB
03/16/2060
0.835%
 
12,022,706
583,468
Series 2020-19 Class IO
12/16/2061
0.719%
 
17,318,092
793,756
Series 2020-3 Class IO
02/16/2062
0.616%
 
17,527,253
673,127
Total Commercial Mortgage-Backed Securities - Agency
(Cost $11,329,007)
3,096,057
 
Commercial Mortgage-Backed Securities - Non-Agency 1.8%
 
 
 
 
 
BXP Trust(a),(g)
Subordinated Series 2021-601L Class E
01/15/2044
2.776%
 
15,400,000
10,922,810
Credit Suisse Mortgage Capital Certificates OA LLC(a)
Subordinated Series 2014-USA Class E
09/15/2037
4.373%
 
9,275,000
5,889,711
Subordinated Series 2014-USA Class F
09/15/2037
4.373%
 
18,400,000
8,096,171
Hilton USA Trust(a),(i)
Subordinated Series 2016-SFP Class F
11/05/2035
0.000%
 
27,400,000
550,965
Home Partners of America Trust(a)
Series 2019-2 Class F
10/19/2039
3.866%
 
2,747,554
2,616,058
The accompanying Notes to Financial Statements are an integral part of this statement.
4
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Commercial Mortgage-Backed Securities - Non-Agency (continued)
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Wells Fargo Commercial Mortgage Trust(a),(d)
Series 2021-FCMT Class E
1-month Term SOFR +
4.614%
Floor 4.500%
05/15/2031
8.943%
 
11,600,000
11,584,307
Total Commercial Mortgage-Backed Securities - Non-Agency
(Cost $79,984,707)
39,660,022
 
Residential Mortgage-Backed Securities - Agency 137.1%
 
 
 
 
 
Fannie Mae REMICS(d),(h)
CMO Series 2017-81 Class SM
-1.0 x 30-day Average SOFR
+ 6.086%
Cap 6.200%
10/25/2047
1.764%
 
23,469,573
2,867,278
CMO Series 2018-64 Class SE
-1.0 x 30-day Average SOFR
+ 6.086%
Cap 6.200%
09/25/2048
1.764%
 
20,991,140
2,580,915
CMO Series 2020-22 Class SA
-1.0 x 30-day Average SOFR
+ 6.214%
Cap 6.100%
04/25/2050
1.664%
 
29,768,255
3,759,683
CMO Series 2023-46 Class SD
-1.0 x 30-day Average SOFR
+ 5.886%
Cap 6.000%
06/25/2050
1.564%
 
58,946,026
6,367,709
Fannie Mae REMICS(g),(h)
CMO Series 2022-90 Class GS
07/25/2050
1.628%
 
39,003,981
4,824,913
Fannie Mae REMICS(d)
CMO Series 2025-10 Class FB
30-day Average SOFR +
0.850%
Floor 0.850%, Cap 6.000%
02/25/2055
5.172%
 
10,389,030
10,177,890
CMO Series 2025-12 Class LF
30-day Average SOFR +
3.950%
Cap 8.250%
03/25/2055
8.184%
 
23,294,183
23,478,936
CMO Series 2025-16 Class MA
30-day Average SOFR +
3.950%
Cap 8.250%
01/25/2055
8.184%
 
10,604,038
10,571,646
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Federal Home Loan Mortgage Corp.
11/01/2052
4.000%
 
23,456,173
21,612,928
12/01/2052
5.000%
 
20,121,701
19,891,802
09/01/2053
5.500%
 
21,564,911
21,536,342
Federal Home Loan Mortgage Corp.(d),(h)
CMO Series 2013-101 Class HS
-1.0 x 30-day Average SOFR
+ 6.386%
Cap 6.500%
10/25/2043
2.064%
 
9,156,098
1,197,286
CMO Series 3922 Class SH
-1.0 x 30-day Average SOFR
+ 5.786%
Cap 5.900%
09/15/2041
1.453%
 
1,814,114
154,797
CMO Series 4097 Class ST
-1.0 x 30-day Average SOFR
+ 5.936%
Cap 6.050%
08/15/2042
1.603%
 
683,578
83,231
CMO Series 4286 Class NS
-1.0 x 30-day Average SOFR
+ 5.786%
Cap 5.900%
12/15/2043
1.453%
 
838,544
99,600
CMO Series 4620 Class AS
-1.0 x 30-day Average SOFR
+ 0.554%
11/15/2042
2.098%
 
886,469
83,530
CMO Series 4704 Class SK
-1.0 x 30-day Average SOFR
+ 6.036%
Cap 6.150%
07/15/2047
1.703%
 
7,350,459
878,183
CMO Series 4826 Class KS
-1.0 x 30-day Average SOFR
+ 6.086%
Cap 6.200%
09/15/2048
1.753%
 
7,951,278
965,804
CMO Series 4926 Class ST
-1.0 x 30-day Average SOFR
+ 5.966%
Cap 6.080%
01/15/2040
1.633%
 
5,600,879
343,860
CMO Series 4987 Class KS
-1.0 x 30-day Average SOFR
+ 6.194%
Cap 6.080%
06/25/2050
1.644%
 
8,601,513
1,228,994
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
5

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 4993 Class MS
-1.0 x 30-day Average SOFR
+ 5.936%
Cap 6.050%
07/25/2050
1.614%
 
16,827,138
2,467,661
CMO STRIPS Series 309 Class S4
-1.0 x 30-day Average SOFR
+ 5.856%
Cap 5.970%
08/15/2043
1.523%
 
1,531,101
158,746
Federal Home Loan Mortgage Corp.(h)
CMO Series 4215 Class IL
07/15/2041
3.500%
 
140,283
3,727
CMO Series 5040 Class IH
11/25/2050
3.500%
 
10,278,108
1,730,497
CMO Series 5083 Class NI
12/25/2040
4.500%
 
8,612,176
1,519,536
CMO STRIPS Series 304 Class C67
12/15/2042
4.500%
 
1,243,154
174,343
Federal Home Loan Mortgage Corp. REMICS(d),(h)
CMO Series 4606 Class SL
-1.0 x 30-day Average SOFR
+ 5.886%
Cap 6.000%
12/15/2044
1.553%
 
37,481,022
4,019,307
CMO Series 5119 Class QS
-1.0 x 30-day Average SOFR
+ 6.300%
Cap 6.300%
06/25/2051
1.978%
 
34,417,796
4,859,851
CMO Series 5138 Class SA
-1.0 x 30-day Average SOFR
+ 5.986%
Cap 6.100%
09/25/2047
1.664%
 
25,206,274
3,011,131
Federal Home Loan Mortgage Corp. REMICS(h)
CMO Series 5105 Class ID
05/25/2051
3.000%
 
34,588,666
5,732,580
CMO Series 5105 Class JI
03/25/2045
3.000%
 
21,320,981
1,975,901
CMO Series 5183 Class IO
01/25/2052
3.000%
 
35,636,290
5,266,923
Federal National Mortgage Association
10/01/2051-
08/01/2052
4.000%
 
64,792,299
60,183,795
09/01/2052
5.000%
 
17,505,775
17,073,075
Federal National Mortgage Association(h)
CMO Series 2012-152 Class EI
07/25/2031
3.000%
 
22,574
2
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2021-3 Class TI
02/25/2051
2.500%
 
43,516,995
7,370,765
Federal National Mortgage Association(d),(h)
CMO Series 2013-101 Class CS
-1.0 x 30-day Average SOFR
+ 5.786%
Cap 5.900%
10/25/2043
1.464%
 
1,749,611
181,345
CMO Series 2014-93 Class ES
-1.0 x 30-day Average SOFR
+ 6.036%
Cap 6.150%
01/25/2045
1.714%
 
960,537
112,580
CMO Series 2015-27 Class AS
-1.0 x 30-day Average SOFR
+ 5.536%
Cap 5.650%
05/25/2045
1.214%
 
7,749,297
639,915
CMO Series 2016-31 Class VS
-1.0 x 30-day Average SOFR
+ 5.886%
Cap 6.000%
06/25/2046
1.564%
 
1,058,556
123,796
CMO Series 2017-50 Class SB
-1.0 x 30-day Average SOFR
+ 5.986%
Cap 6.100%
07/25/2047
1.664%
 
6,492,550
708,652
CMO Series 2017-72 Class S
-1.0 x 30-day Average SOFR
+ 3.836%
Cap 2.750%
09/25/2047
0.000%
 
16,996,118
585,630
CMO Series 2017-90 Class SP
-1.0 x 30-day Average SOFR
+ 6.036%
Cap 6.150%
11/25/2047
1.714%
 
6,602,399
789,569
CMO Series 2020-38 Class SE
-1.0 x 30-day Average SOFR
+ 5.936%
Cap 6.050%
06/25/2050
1.614%
 
4,852,774
573,082
CMO Series 2020-38 Class WS
-1.0 x 30-day Average SOFR
+ 4.886%
Cap 5.000%
06/25/2050
0.564%
 
19,806,688
1,610,123
The accompanying Notes to Financial Statements are an integral part of this statement.
6
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Federal National Mortgage Association REMICS(d),(h)
CMO Series 2018-3 Class SB
-1.0 x 30-day Average SOFR
+ 6.036%
Cap 6.150%
02/25/2048
1.714%
 
20,761,527
2,602,802
CMO Series 2019-5 Class SA
-1.0 x 30-day Average SOFR
+ 5.986%
Cap 6.100%
03/25/2049
1.664%
 
29,978,327
3,074,679
CMO Series 2020-34 Class S
-1.0 x 30-day Average SOFR
+ 5.936%
Cap 6.050%
06/25/2050
1.614%
 
29,999,456
3,825,390
CMO Series 2020-54 Class AS
-1.0 x 30-day Average SOFR
+ 6.036%
Cap 6.150%
08/25/2050
1.714%
 
20,938,368
2,479,136
CMO Series 2024-74 Class SD
-1.0 x 30-day Average SOFR
+ 6.600%
Cap 6.600%
10/25/2054
2.278%
 
28,761,925
3,599,863
Freddie Mac REMICS(d),(h)
CMO Series 4979 Class YS
-1.0 x 30-day Average SOFR
+ 5.936%
Cap 6.050%
06/25/2050
1.614%
 
19,733,376
2,685,016
Freddie Mac REMICS(d)
CMO Series 5513 Class MQ
30-day Average SOFR +
3.950%
Cap 8.250%
06/25/2054
8.184%
 
19,183,405
19,635,673
CMO Series 5513 Class MU
30-day Average SOFR +
3.950%
Cap 8.250%
11/25/2054
8.184%
 
33,455,734
33,979,574
CMO Series 5532 Class MB
30-day Average SOFR +
3.950%
Cap 8.250%
04/25/2055
8.184%
 
19,242,528
19,359,040
CMO Series 5542 Class F
30-day Average SOFR +
4.300%
05/25/2055
8.334%
 
12,859,799
12,910,668
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Freddie Mac REMICS(d),(e),(f),(h)
CMO Series 5544 Class SC
30-day Average SOFR +
7.000%
06/25/2055
2.649%
 
22,630,886
3,005,665
Freddie Mac REMICS(d),(e),(f)
CMO Series 5548 Class F
30-day Average SOFR +
4.600%
Cap 8.700%
06/25/2055
7.950%
 
20,500,000
20,602,500
Government National Mortgage Association(d),(h)
CMO Series 2010-9 Class XD
-1.0 x 1-month Term SOFR +
6.486%
Cap 6.600%
01/16/2040
2.157%
 
27,450,428
3,019,898
CMO Series 2014-6 Class SJ
-1.0 x 1-month Term SOFR +
5.986%
Cap 6.100%
01/20/2044
1.661%
 
7,928,269
814,826
CMO Series 2017-163 Class SD
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
11/20/2047
1.761%
 
8,158,977
1,187,522
CMO Series 2018-124 Class SG
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
09/20/2048
1.761%
 
8,057,570
1,007,545
CMO Series 2018-155 Class LS
-1.0 x 1-month Term SOFR +
6.036%
Cap 6.150%
11/20/2048
1.711%
 
6,733,337
742,325
CMO Series 2018-40 Class SC
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
03/20/2048
1.761%
 
5,279,012
604,238
CMO Series 2018-63 Class HS
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
04/20/2048
1.761%
 
7,062,524
809,939
CMO Series 2018-63 Class SH
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
04/20/2048
1.761%
 
6,668,905
688,322
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
7

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2018-78 Class SB
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
06/20/2048
1.761%
 
5,969,910
762,313
CMO Series 2018-94 Class SA
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
05/20/2048
1.761%
 
5,537,130
741,955
CMO Series 2019-103 Class SA
-1.0 x 1-month Term SOFR +
5.936%
Cap 6.050%
08/20/2049
1.611%
 
12,527,930
1,678,626
CMO Series 2019-128 Class YS
-1.0 x 1-month Term SOFR +
2.736%
Cap 2.850%
10/20/2049
0.000%
 
33,573,039
110,046
CMO Series 2019-21 Class QS
-1.0 x 1-month Term SOFR +
5.986%
Cap 6.100%
10/20/2046
1.661%
 
26,770,970
3,325,262
CMO Series 2019-43 Class NS
-1.0 x 1-month Term SOFR +
3.156%
Cap 3.270%
04/20/2049
0.000%
 
13,056,134
221,574
CMO Series 2020-104 Class SA
-1.0 x 1-month Term SOFR +
6.086%
Cap 6.200%
07/20/2050
1.761%
 
8,869,726
1,133,092
CMO Series 2020-133 Class DS
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
09/20/2050
1.861%
 
55,983,362
6,966,614
CMO Series 2020-148 Class SA
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
10/20/2050
1.861%
 
18,349,203
2,405,808
CMO Series 2020-160 Class AS
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
10/20/2050
1.861%
 
30,129,216
4,219,398
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2020-175 Class NS
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
11/20/2050
1.861%
 
20,961,530
2,949,440
CMO Series 2020-187 Class SE
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
12/20/2050
1.861%
 
16,459,151
2,304,047
CMO Series 2020-31 Class ES
-1.0 x 1-month Term SOFR +
5.936%
Cap 6.050%
03/20/2050
1.611%
 
17,087,389
1,769,900
CMO Series 2020-34 Class SA
-1.0 x 1-month Term SOFR +
5.936%
Cap 6.050%
03/20/2050
1.611%
 
19,491,269
2,565,681
CMO Series 2020-62 Class SK
-1.0 x 1-month Term SOFR +
6.036%
Cap 6.150%
05/20/2050
1.711%
 
8,495,630
1,087,149
CMO Series 2020-67 Class KS
-1.0 x 1-month Term SOFR +
5.836%
Cap 5.950%
05/20/2050
1.511%
 
17,182,878
2,024,949
CMO Series 2020-78 Class SD
-1.0 x 1-month Term SOFR +
6.036%
Cap 6.150%
06/20/2050
1.711%
 
22,182,934
2,684,404
CMO Series 2021-117 Class ES
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
07/20/2051
1.861%
 
29,525,613
4,101,311
CMO Series 2021-117 Class HS
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
07/20/2051
1.861%
 
23,766,273
3,131,855
CMO Series 2021-119 Class SC
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
07/20/2051
1.861%
 
25,164,497
3,324,361
The accompanying Notes to Financial Statements are an integral part of this statement.
8
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2021-122 Class SB
-1.0 x 1-month Term SOFR +
2.486%
Cap 2.600%
07/20/2051
0.000%
 
54,062,759
296,221
CMO Series 2021-122 Class SG
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
07/20/2051
1.861%
 
54,894,790
7,320,149
CMO Series 2021-142 Class SL
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
08/20/2051
1.861%
 
58,030,102
7,996,362
CMO Series 2021-155 Class SM
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
07/20/2051
1.861%
 
29,292,953
3,940,643
CMO Series 2021-156 Class SA
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
09/20/2051
1.861%
 
42,779,991
5,999,646
CMO Series 2021-160 Class S
-1.0 x 30-day Average SOFR
+ 2.650%
Cap 2.650%
09/20/2051
0.000%
 
73,938,973
438,643
CMO Series 2021-161 Class SL
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
09/20/2051
1.861%
 
35,826,066
4,982,668
CMO Series 2021-193 Class ES
30-day Average SOFR +
1.700%
11/20/2051
0.000%
 
252,508,488
881,154
CMO Series 2021-42 Class SD
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
11/20/2050
1.861%
 
35,695,197
5,045,559
CMO Series 2021-42 Class SG
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
03/20/2051
1.861%
 
30,599,007
4,056,091
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2021-96 Class US
-1.0 x 30-day Average SOFR
+ 3.250%
Cap 3.250%
06/20/2051
0.000%
 
41,797,619
588,335
CMO Series 2021-97 Class CS
-1.0 x 1-month Term SOFR +
6.186%
Cap 6.300%
06/20/2051
1.861%
 
41,084,082
5,578,315
CMO Series 2022-161 Class SQ
-1.0 x 30-day Average SOFR
+ 5.350%
Cap 5.350%
09/20/2052
1.022%
 
39,884,869
2,763,355
CMO Series 2022-168 Class ST
-1.0 x 30-day Average SOFR
+ 6.000%
Cap 6.000%
09/20/2052
1.672%
 
55,331,774
5,032,204
CMO Series 2022-46 Class SE
-1.0 x 30-day Average SOFR
+ 3.450%
Cap 3.450%
03/20/2052
0.000%
 
23,233,038
295,127
CMO Series 2022-83 Class AS
-1.0 x 1-month Term SOFR +
6.036%
Cap 6.150%
06/20/2050
1.711%
 
22,332,011
2,917,887
CMO Series 2022-90 Class SJ
-1.0 x 1-month Term SOFR +
5.936%
Cap 6.050%
01/20/2050
1.611%
 
31,129,182
3,227,965
CMO Series 2023-101 Class CS
-1.0 x 30-day Average SOFR
+ 6.000%
Cap 6.000%
07/20/2053
1.672%
 
80,639,546
5,264,416
CMO Series 2023-113 Class CS
-1.0 x 30-day Average SOFR
+ 5.730%
Cap 5.730%
08/20/2053
1.402%
 
14,960,775
1,192,019
CMO Series 2023-113 Class HS
1-month Term SOFR +
5.936%
Cap 6.050%
09/20/2049
1.611%
 
50,342,062
5,724,733
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
9

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2023-115 Class SM
-1.0 x 30-day Average SOFR
+ 5.900%
Cap 5.900%
08/20/2053
1.572%
 
46,267,189
2,571,197
CMO Series 2023-141 Class SQ
-1.0 x 1-month Term SOFR +
5.936%
Cap 6.050%
12/20/2049
1.611%
 
33,046,717
3,412,021
CMO Series 2023-173 Class SB
-1.0 x 30-day Average SOFR
+ 5.650%
Cap 5.650%
11/20/2053
1.322%
 
64,785,253
5,265,506
CMO Series 2023-47 Class AS
-1.0 x 30-day Average SOFR
+ 6.350%
Cap 6.350%
03/20/2053
2.022%
 
25,834,938
2,003,665
CMO Series 2023-66 Class BS
-1.0 x 30-day Average SOFR
+ 6.150%
Cap 6.150%
05/20/2053
1.822%
 
22,412,438
2,031,044
CMO Series 2023-66 Class SQ
-1.0 x 30-day Average SOFR
+ 5.400%
Cap 5.400%
05/20/2053
1.072%
 
58,144,911
2,475,043
CMO Series 2024-197 Class SV
-1.0 x 30-day Average SOFR
+ 6.050%
Cap 6.050%
12/20/2054
1.722%
 
19,865,086
2,342,576
CMO Series 2024-51 Class US
-1.0 x 30-day Average SOFR
+ 5.400%
Cap 5.400%
03/20/2054
1.072%
 
35,489,412
2,015,795
CMO Series 2024-64 Class DS
-1.0 x 30-day Average SOFR
+ 5.400%
Cap 5.400%
04/20/2054
1.072%
 
48,538,847
2,596,469
CMO Series 2024-64 Class SY
-1.0 x 30-day Average SOFR
+ 5.900%
Cap 5.900%
04/20/2054
1.550%
 
48,565,469
4,899,158
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2024-79 Class SH
-1.0 x 30-day Average SOFR
+ 7.250%
Cap 7.250%
05/20/2054
2.922%
 
22,049,710
3,243,645
CMO Series 2024-97 Class KS
-1.0 x 30-day Average SOFR
+ 7.300%
Cap 7.300%
06/20/2054
2.972%
 
28,254,625
4,655,780
Government National Mortgage Association(h)
CMO Series 2014-184 Class CI
11/16/2041
3.500%
 
4,022,717
409,638
CMO Series 2018-78 Class GI
04/20/2048
4.000%
 
5,319,636
789,552
CMO Series 2020-160 Class DI
10/20/2050
2.500%
 
16,376,153
2,446,579
CMO Series 2020-160 Class HI
10/20/2050
2.500%
 
13,323,264
1,711,645
CMO Series 2020-160 Class ID
10/20/2050
2.500%
 
11,838,576
1,761,291
CMO Series 2020-162 Class EI
10/20/2050
2.500%
 
12,333,339
1,835,573
CMO Series 2020-164 Class CI
11/20/2050
3.000%
 
15,051,634
2,358,736
CMO Series 2020-191 Class UC
12/20/2050
4.000%
 
18,516,395
3,764,365
CMO Series 2020-191 Class UM
12/20/2050
3.500%
 
27,602,449
4,346,845
CMO Series 2020-85 Class MI
06/20/2050
3.500%
 
11,264,857
2,342,427
CMO Series 2021-158 Class VI
09/20/2051
3.000%
 
30,020,315
4,798,537
CMO Series 2021-160 Class CI
09/20/2051
2.500%
 
61,866,719
8,555,660
CMO Series 2021-175 Class IJ
10/20/2051
3.000%
 
6,571,162
1,120,627
CMO Series 2021-24 Class MI
02/20/2051
3.000%
 
14,590,228
2,445,667
CMO Series 2021-29 Class HI
02/20/2051
3.500%
 
18,773,766
3,603,057
CMO Series 2021-44 Class CI
03/20/2051
3.000%
 
22,175,470
3,871,507
CMO Series 2021-44 Class MI
03/20/2051
3.000%
 
14,722,526
2,236,013
CMO Series 2021-58 Class IA
04/20/2051
3.500%
 
12,456,047
2,317,864
The accompanying Notes to Financial Statements are an integral part of this statement.
10
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Agency 137.1%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2021-7 Class IT
01/16/2051
3.000%
 
28,095,556
6,391,691
Government National Mortgage Association(d)
CMO Series 2025-39 Class M
30-day Average SOFR +
4.000%
Floor 4.000%, Cap 7.700%
03/20/2055
6.318%
 
9,780,258
9,788,382
Government National Mortgage Association TBA(j)
06/20/2054
4.500%
 
240,000,000
226,391,861
Uniform Mortgage-Backed Security TBA(j)
06/13/2054
3.000%
 
117,000,000
99,536,711
06/13/2054
4.000%
 
567,500,000
519,869,129
06/13/2054
4.500%
 
633,000,000
596,952,138
06/13/2054
5.500%
 
60,000,000
59,394,689
06/12/2055
3.500%
 
403,420,484
357,540,376
06/12/2055
5.000%
 
261,000,000
252,610,460
06/12/2055
6.000%
 
260,000,000
262,537,980
Total Residential Mortgage-Backed Securities - Agency
(Cost $3,066,690,473)
2,990,502,656
 
Residential Mortgage-Backed Securities - Non-Agency 47.2%
 
 
 
 
 
A&D Mortgage Trust(a),(k)
CMO Series 2024-NQM1 Class A1
02/25/2069
6.195%
 
3,490,981
3,505,620
A&D Mortgage Trust(a),(g)
Subordinated CMO Series 2024-NQM1 Class B1
02/25/2069
8.604%
 
5,600,000
5,649,783
Ajax Mortgage Loan Trust(a),(k)
CMO Series 2021-C Class A
01/25/2061
5.115%
 
3,398,823
3,369,864
Ajax Mortgage Loan Trust(a),(g)
Subordinated CMO Series 2021-E Class B2
12/25/2060
4.001%
 
8,617,660
4,726,611
AlphaFlow Transitional Mortgage Trust(a)
CMO Series 2021-WL1 Class A1
01/25/2026
3.280%
 
910,728
856,198
Angel Oak Mortgage Trust(a),(g)
CMO Series 2021-5 Class A3
07/25/2066
1.311%
 
3,667,310
3,165,128
Subordinated CMO Series 2019-6 Class B1
11/25/2059
3.941%
 
9,450,000
8,702,519
Angel Oak Mortgage Trust I LLC(a),(g)
Subordinated CMO Series 2019-2 Class B2
03/25/2049
6.286%
 
4,800,000
4,870,991
Barclays Mortgage Trust(a),(k)
CMO Series 2021-NPL1 Class B
11/25/2051
4.625%
 
3,548,267
3,574,541
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
BRAVO Residential Funding Trust(a),(g)
CMO Series 2020-NQM1 Class B1
05/25/2060
5.086%
 
2,200,000
2,142,204
CMO Series 2020-NQM1 Class B2
05/25/2060
5.998%
 
2,800,000
2,709,084
Subordinated CMO Series 2021-NQM2 Class B1
03/25/2060
3.044%
 
6,626,000
5,910,350
Subordinated CMO Series 2021-NQM2 Class B2
03/25/2060
4.099%
 
4,100,000
3,466,009
BRAVO Residential Funding Trust(a),(d)
CMO Series 2021-HE2 Class B1
30-day Average SOFR +
2.400%
11/25/2069
6.722%
 
6,000,000
5,981,909
Subordinated CMO Series 2021-HE1 Class B1
30-day Average SOFR +
2.500%
01/25/2070
6.458%
 
6,708,000
6,517,903
Subordinated CMO Series 2021-HE1 Class B2
30-day Average SOFR +
3.000%
01/25/2070
6.458%
 
4,129,000
3,921,358
Subordinated CMO Series 2021-HE2 Class B2
30-day Average SOFR +
3.400%
11/25/2069
7.722%
 
6,570,000
6,569,194
CAFL Issuer LP(a)
CMO Series 2025-RTL1 Class M1
05/28/2040
8.160%
 
3,000,000
2,999,972
CHNGE Mortgage Trust(a),(g)
CMO Series 2022-1 Class M1
01/25/2067
3.990%
 
4,650,000
3,912,554
CMO Series 2023-3 Class M1
07/25/2058
8.271%
 
8,900,000
9,016,974
Subordinated CMO Series 2022-1 Class B1
01/25/2067
4.548%
 
8,350,000
6,935,816
Subordinated CMO Series 2022-1 Class B2
01/25/2067
4.548%
 
7,431,000
5,453,158
Subordinated CMO Series 2022-2 Class B1
03/25/2067
4.621%
 
4,569,000
3,938,683
Subordinated CMO Series 2023-1 Class B1
03/25/2058
8.237%
 
5,373,000
5,369,308
Subordinated CMO Series 2023-1 Class B2
03/25/2058
8.237%
 
5,829,000
5,770,455
Subordinated CMO Series 2023-2 Class B1
06/25/2058
8.182%
 
4,942,000
4,946,222
Subordinated CMO Series 2023-3 Class B1
07/25/2058
8.271%
 
3,700,000
3,710,126
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
11

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CHNGE Mortgage Trust(a),(k)
CMO Series 2022-NQM1 Class M1
06/25/2067
5.820%
 
3,150,000
3,133,685
Citigroup Mortgage Loan Trust(a)
Subordinated CMO Series 2015-RP2 Class B5
01/25/2053
4.250%
 
13,205,608
9,436,317
Citigroup Mortgage Loan Trust(a),(l)
Subordinated CMO Series 2015-RP2 Class FB
01/25/2053
0.000%
 
1,335,276
535,802
Citigroup Mortgage Loan Trust(a),(g),(h)
Subordinated CMO Series 2015-RP2 Class XIO
01/25/2053
1.166%
 
34,235,924
1,055,504
Citigroup Mortgage Loan Trust(a),(g)
Subordinated CMO Series 2018-RP3 Class B3
03/25/2061
3.250%
 
10,497,650
7,409,078
COLT Mortgage Loan Trust(a),(g)
CMO Series 2020-2 Class M1
03/25/2065
5.250%
 
1,463,000
1,459,872
CMO Series 2021-3 Class A3
09/27/2066
1.419%
 
5,870,629
4,984,012
CMO Series 2023-1 Class B2
04/25/2068
8.019%
 
4,546,000
4,500,848
CMO Series 2025-5 Class B1
05/25/2070
7.439%
 
3,728,000
3,734,109
Subordinated CMO Series 2020-2 Class B1
03/25/2065
5.250%
 
3,716,000
3,688,050
Subordinated CMO Series 2021-4 Class B1
10/25/2066
3.764%
 
5,969,000
4,451,387
Subordinated CMO Series 2022-4 Class B2
03/25/2067
4.700%
 
4,993,000
4,455,350
Subordinated Series 2021-3 Class B1
09/27/2066
3.059%
 
2,502,000
1,704,627
COLT Mortgage Loan Trust(a),(k)
CMO Series 2025-5 Class A1
05/25/2070
5.536%
 
8,000,000
8,005,528
Connecticut Avenue Securities Trust(a),(d)
Subordinated CMO Series 2021-R03 Class 1B2
30-day Average SOFR +
5.500%
Floor 5.500%
12/25/2041
9.822%
 
7,059,000
7,366,063
Subordinated CMO Series 2022-R01 Class 1B2
30-day Average SOFR +
6.000%
12/25/2041
10.322%
 
10,350,000
10,863,718
Deephaven Residential Mortgage Trust(a),(g)
Subordinated CMO Series 2020-2 Class B3
05/25/2065
6.413%
 
4,911,000
4,895,260
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
EASY(a),(k)
CMO Series 2025-RTL1 Class A1
05/25/2040
6.456%
 
10,000,000
10,019,403
EASY(a),(g)
CMO Series 2025-RTL1 Class M
05/25/2040
9.116%
 
3,750,000
3,688,092
Fannie Mae Connecticut Avenue Securities(a),(d)
Subordinated CMO Series 2021-R02 Class 2B2
30-day Average SOFR +
6.200%
11/25/2041
10.522%
 
11,350,000
11,931,522
FIGRE Trust(a),(g)
CMO Series 2025-HE1 Class F
01/25/2055
9.083%
 
2,110,000
2,107,983
Subordinated CMO Series 2023-HE3 Class D
01/25/2042
7.747%
 
1,935,470
1,990,929
Subordinated CMO Series 2024-HE1 Class E
03/25/2054
8.323%
 
2,350,000
2,405,213
Subordinated CMO Series 2024-HE1 Class F
03/25/2054
10.029%
 
3,250,000
3,374,466
Subordinated CMO Series 2024-HE2 Class F
05/25/2054
9.790%
 
7,575,000
8,018,395
Subordinated CMO Series 2024-HE3 Class E
07/25/2054
7.551%
 
1,850,000
1,894,467
Subordinated CMO Series 2024-HE3 Class F
07/25/2054
9.261%
 
1,550,000
1,594,265
Subordinated CMO Series 2024-HE4 Class E
09/25/2054
6.809%
 
1,900,000
1,876,044
Subordinated CMO Series 2024-HE4 Class F
09/25/2054
8.482%
 
1,300,000
1,233,147
Subordinated CMO Series 2024-HE5 Class E
10/25/2054
7.010%
 
3,950,000
3,915,786
Subordinated CMO Series 2024-HE5 Class F
10/25/2054
8.630%
 
2,900,000
2,923,101
FMC GMSR Issuer Trust(a),(g)
CMO Series 2020-GT1 Class A
01/25/2026
4.450%
 
9,050,000
8,763,777
Freddie Mac STACR(d)
CMO Series 2020-CS02 Class M4
30-day Average SOFR +
0.114%
06/25/2033
4.454%
 
218,362
217,769
Freddie Mac STACR REMIC Trust(a),(d)
Subordinated CMO Series 2020-DNA6 Class B2
30-day Average SOFR +
5.650%
12/25/2050
9.972%
 
15,500,000
17,634,621
The accompanying Notes to Financial Statements are an integral part of this statement.
12
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Subordinated CMO Series 2021-DNA1 Class B2
30-day Average SOFR +
4.750%
01/25/2051
9.072%
 
14,000,000
15,393,164
Subordinated CMO Series 2021-DNA5 Class B2
30-day Average SOFR +
5.500%
01/25/2034
9.822%
 
23,300,000
26,546,589
Subordinated CMO Series 2021-DNA6 Class B2
30-day Average SOFR +
7.500%
10/25/2041
11.822%
 
7,450,000
7,929,653
Freddie Mac STACR Single Seller Risk Transfer Debt Notes(a),(d)
Subordinated CMO Series 2019-CS03 Class B2
30-day Average SOFR +
0.114%
10/25/2032
4.454%
 
7,345,104
6,760,291
Freddie Mac STACR Single Seller Risk Transfer Debt Notes(h)
Subordinated CMO Series 2019-CS03 Class IO
10/25/2029
0.270%
 
625,707,836
4,971,124
Freddie Mac Structured Agency Credit Risk Debt Notes(a),(d)
CMO Series 2019-CS02 Class B2
30-day Average SOFR +
0.114%
02/25/2032
4.454%
 
2,300,000
2,235,395
CMO Series 2019-CS02 Class B3
30-day Average SOFR +
0.114%
02/25/2032
4.454%
 
2,950,000
2,756,909
CMO Series 2020-CS01 Class B2
30-day Average SOFR +
0.114%
04/25/2033
4.454%
 
16,988,156
13,647,632
Subordinated CMO Series 2020-HQA5 Class B1
30-day Average SOFR +
4.000%
11/25/2050
8.322%
 
6,750,000
7,491,978
Subordinated CMO Series 2020-HQA5 Class B2
30-day Average SOFR +
7.400%
11/25/2050
11.722%
 
14,200,000
17,025,855
Freddie Mac Structured Agency Credit Risk Debt Notes(h)
CMO Series 2019-CS02 Class IO
02/25/2029
0.270%
 
255,378,536
1,819,776
CMO Series 2020-CS02 Class IO1
05/25/2030
0.090%
 
465,461,907
1,368,691
CMO Series 2020-CS02 Class IO2
06/25/2030
0.115%
 
465,461,907
1,748,833
Freddie Mac Structured Agency Credit Risk Debt Notes(a),(h)
CMO Series 2020-CS01 Class IO1
04/25/2030
0.080%
 
2,004,994,497
5,019,704
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2020-CS01 Class IO2
04/25/2030
0.125%
 
2,004,994,500
7,843,338
Freddie Mac Structured Agency Credit Risk Debt Notes(d)
Subordinated CMO Series 2020-CS02 Class B2
30-day Average SOFR +
0.114%
06/25/2033
4.454%
 
5,650,000
4,653,476
GCAT Trust(a),(g)
CMO Series 2019-NQM3 Class M1
11/25/2059
3.450%
 
5,650,000
5,137,991
Genworth Mortgage Insurance Corp.(a),(d)
CMO Series 2021-3 Class M1B
30-day Average SOFR +
2.900%
Floor 2.900%
02/25/2034
7.222%
 
11,186,182
11,241,195
Subordinated CMO Series 2021-3 Class B1
30-day Average SOFR +
4.950%
Floor 4.950%
02/25/2034
9.272%
 
7,500,000
7,668,994
GITSIT Mortgage Loan Trust(a),(k)
CMO Series 2025-NPL1 Class A1
02/25/2055
6.203%
 
5,601,292
5,599,889
Homeward Opportunities Fund I Trust(a),(g)
Subordinated CMO Series 2020-2 Class B1
05/25/2065
5.450%
 
3,750,000
3,789,966
Homeward Opportunities Fund Trust(a),(g)
CMO Series 2022-1 Class M1
07/25/2067
5.038%
 
3,000,000
2,923,690
HTAP(a)
CMO Series 2024-1 Class A
04/25/2037
7.000%
 
7,099,866
7,091,947
HTAP Issuer Trust(a)
CMO Series 2024-2 Class A
04/25/2042
6.500%
 
13,903,372
13,738,831
CMO Series 2025-1 Class A
11/25/2042
6.500%
 
6,899,905
6,761,156
Subordinated CMO Series 2024-2 Class B
04/25/2042
7.500%
 
4,700,000
4,498,443
Imperial Fund Mortgage Trust(a),(g)
Subordinated CMO Series 2021-NQM3 Class B1
11/25/2056
4.118%
 
7,384,000
5,753,053
Subordinated CMO Series 2022-NQM3 Class B1
05/25/2067
4.414%
 
4,489,000
3,566,084
Imperial Fund Mortgage Trust(a),(k)
Subordinated CMO Series 2022-NQM5 Class B2
08/25/2067
6.250%
 
3,000,000
2,899,667
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
13

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
LHOME Mortgage Trust(a),(k)
CMO Series 2023-RTL3 Class A2
08/25/2028
9.000%
 
8,400,000
8,443,918
CMO Series 2024-RTL1 Class A2
01/25/2029
9.165%
 
5,200,000
5,248,789
CMO Series 2024-RTL1 Class M
01/25/2029
11.949%
 
3,700,000
3,749,137
LHOME Mortgage Trust(a),(g)
CMO Series 2024-RTL5 Class M1
09/25/2039
6.823%
 
4,358,000
4,305,551
CMO Series 2025-RTL1 Class M1
01/25/2040
7.023%
 
5,368,000
5,302,353
Mello Mortgage Capital Acceptance(a),(k)
CMO Series 2024-SD1 Class M2
04/25/2054
4.000%
 
5,802,000
5,199,502
MFA Trust(a),(g)
CMO Series 2020-NQM3 Class M1
01/26/2065
2.654%
 
3,500,000
3,129,674
Subordinated CMO Series 2020-NQM3 Class B1
01/26/2065
3.661%
 
6,250,000
5,516,635
MFA Trust(k)
CMO Series 2024-NPL1 Class A1
09/25/2054
6.330%
 
16,927,984
16,988,923
New Residential Mortgage Loan Trust(a),(g),(h)
CMO Series 2014-1A Class AIO
01/25/2054
2.164%
 
3,034,797
137,115
New Residential Mortgage Loan Trust(a),(g)
Subordinated CMO Series 2019-RPL3 Class B4
07/25/2059
3.991%
 
9,250,000
6,513,887
Subordinated CMO Series 2022-NQM2 Class B1
03/27/2062
3.859%
 
2,887,000
2,022,682
Subordinated CMO Series 2024-RPL1 Class B4
01/25/2064
3.879%
 
6,748,000
4,192,431
Subordinated CMO Series 2024-RPL1 Class B5
01/25/2064
3.879%
 
5,287,000
2,829,621
NRZ Excess Spread-Collateralized Notes(a)
Series 2020-PLS1 Class A
12/25/2025
3.844%
 
1,674,029
1,653,009
NYMT Loan Trust(a),(k)
CMO Series 2024-BPL1 Class A1
02/25/2029
7.154%
 
6,850,000
6,869,114
NYMT Loan Trust(a),(g)
CMO Series 2024-CP1 Class A2
02/25/2068
3.963%
 
5,295,000
4,043,302
CMO Series 2024-CP1 Class M1
02/25/2068
3.963%
 
2,350,000
1,715,772
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
NYMT Loan Trust(a)
CMO Series 2025-R1 Class A
02/25/2030
6.381%
 
6,506,862
6,503,511
NYMT Trust(a),(k)
CMO Series 2024-RR1 Class A
05/25/2064
7.375%
 
13,903,286
13,947,053
Oaktown Re VI Ltd.(a),(d)
CMO Series 2021-1A Class B1
30-day Average SOFR +
5.500%
Floor 5.500%
10/25/2033
9.822%
 
2,373,000
2,432,710
CMO Series 2021-1A Class M2
30-day Average SOFR +
3.950%
Floor 3.950%
10/25/2033
8.272%
 
6,500,000
6,620,792
OBX Trust(a),(g)
CMO Series 2021-NQM2 Class A1
05/25/2061
1.101%
 
6,911,069
5,601,805
CMO Series 2021-NQM3 Class A1
07/25/2061
1.054%
 
5,019,315
4,058,864
OSAT Trust(a),(k)
CMO Series 2021-RPL1 Class A2
05/25/2065
6.967%
 
5,328,754
4,849,296
Point Securitization Trust(a),(g)
CMO Series 2021-1 Class A1
02/25/2052
3.228%
 
8,505,162
8,425,176
Point Securitization Trust(a)
CMO Series 2025-1 Class A1
06/25/2055
6.250%
 
7,750,000
7,659,416
Preston Ridge Partners Mortgage(a),(k)
CMO Series 2021-4 Class A2
04/25/2026
3.474%
 
5,758,991
5,735,092
Preston Ridge Partners Mortgage LLC(a),(k)
CMO Series 2020-4 Class A1
10/25/2025
2.610%
 
5,037,945
5,039,658
Preston Ridge Partners Mortgage Trust(a),(k)
CMO Series 2023-RCF1 Class M2
06/25/2053
4.000%
 
7,802,000
7,184,698
CMO Series 2023-RCF2 Class M1
11/25/2053
4.000%
 
1,724,000
1,622,033
CMO Series 2023-RCF2 Class M2
11/25/2053
4.000%
 
3,688,000
3,344,351
PRET LLC(a),(k)
CMO Series 2024-NPL4 Class A2
07/25/2054
9.437%
 
8,500,000
8,513,576
CMO Series 2024-NPL5 Class A1
09/25/2054
5.963%
 
9,845,871
9,825,656
The accompanying Notes to Financial Statements are an integral part of this statement.
14
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2024-NPL5 Class A2
09/25/2054
8.835%
 
5,000,000
4,959,524
CMO Series 2024-NPL6 Class A2
10/25/2054
8.716%
 
10,875,000
10,836,969
CMO Series 2024-NPL7 Class A2
10/25/2054
8.956%
 
10,000,000
10,079,470
CMO Series 2024-NPL9 Class A2
12/25/2054
8.595%
 
9,050,000
9,102,850
Pretium Mortgage Credit Partners LLC(a),(k)
CMO Series 2021-RN2 Class A1
07/25/2051
4.744%
 
2,536,420
2,525,478
PRKCM Trust(a),(g)
CMO Series 2022-AFC1 Class A3
04/25/2057
4.100%
 
5,893,575
5,544,520
PRPM LLC(a),(k)
CMO Series 2025-RPL1 Class M2
03/25/2055
4.000%
 
9,500,000
8,176,811
PRPM LLC(a),(k)
CMO Series 2024-2 Class A2
03/25/2029
10.037%
 
1,500,000
1,501,649
CMO Series 2024-5 Class A1
09/25/2029
5.689%
 
4,940,208
4,940,195
CMO Series 2024-5 Class A2
09/25/2029
9.076%
 
2,800,000
2,808,230
CMO Series 2024-7 Class A1
12/25/2029
5.870%
 
8,044,137
8,034,001
CMO Series 2024-8 Class A1
12/25/2029
5.897%
 
4,935,298
4,966,805
CMO Series 2024-8 Class A2
12/25/2029
8.836%
 
6,100,000
6,135,296
CMO Series 2024-RCF1 Class M1
01/25/2054
4.000%
 
1,850,000
1,729,938
CMO Series 2024-RCF1 Class M2
01/25/2054
4.000%
 
9,750,000
8,788,263
CMO Series 2024-RCF2 Class M1
03/25/2054
3.750%
 
2,800,000
2,586,980
CMO Series 2024-RCF2 Class M2
03/25/2054
3.750%
 
11,150,000
9,896,393
CMO Series 2024-RCF3 Class M2
05/25/2054
4.000%
 
2,250,000
2,004,015
CMO Series 2024-RCF4 Class M1
07/25/2054
4.000%
 
2,335,000
2,135,920
CMO Series 2024-RCF4 Class M2
07/25/2054
4.000%
 
1,910,000
1,690,537
CMO Series 2024-RCF6 Class M1
10/25/2054
4.000%
 
2,350,000
2,158,392
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2024-RCF6 Class M2
10/25/2054
4.000%
 
4,088,000
3,584,506
CMO Series 2024-RPL4 Class M1
12/25/2054
4.000%
 
4,700,000
4,343,161
CMO Series 2024-RPL4 Class M2
12/25/2054
4.000%
 
4,408,000
3,844,709
CMO Series 2025-2 Class A2
05/25/2030
9.560%
 
4,900,000
4,875,033
PRPM Trust(a),(g)
Subordinated CMO Series 2022-NQM1 Class B1
08/25/2067
5.432%
 
4,608,000
4,468,100
Subordinated CMO Series 2023-NQM1 Class B1
01/25/2068
6.328%
 
2,700,000
2,665,640
Subordinated CMO Series 2023-NQM3 Class B2
11/25/2068
7.459%
 
2,043,000
1,998,559
Radnor Re Ltd.(a),(d)
Subordinated CMO Series 2021-1 Class B1
30-day Average SOFR +
4.000%
Floor 4.000%
12/27/2033
8.322%
 
4,750,000
4,797,291
RCO VIII Mortgage LLC(a),(k)
CMO Series 2025-3 Class A1
05/25/2030
6.435%
 
7,000,000
6,991,361
RCO X Mortgage LLC(a),(k)
CMO Series 2025-1 Class A1
01/25/2030
5.875%
 
8,242,028
8,245,460
CMO Series 2025-1 Class A2
01/25/2030
8.353%
 
7,500,000
7,433,119
Residential Mortgage Loan Trust(a),(g)
Subordinated CMO Series 2020-1 Class B1
01/26/2060
3.946%
 
3,938,000
3,736,619
RUN Trust(a),(g)
CMO Series 2022-NQM1 Class M1
03/25/2067
4.038%
 
5,595,000
4,415,266
Saluda Grade Alternative Mortgage Trust(a),(g)
Subordinated CMO Series 2022-INV1 Class B1
04/25/2067
4.622%
 
5,198,000
3,907,857
Subordinated CMO Series 2022-INV1 Class B2
04/25/2067
4.622%
 
4,958,000
3,424,556
Subordinated CMO Series 2023-FIG3 Class CE
08/25/2053
3.989%
 
6,714,740
9,515,499
Subordinated CMO Series 2023-FIG4 Class CE
11/25/2053
49.381%
 
7,824,017
13,477,589
Stanwich Mortgage Loan Co. LLC(a),(k)
CMO Series 2021-NPB1 Class A1
10/16/2026
6.235%
 
537,064
536,760
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
15

Portfolio of Investments (continued)
May 31, 2025
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
CMO Series 2021-NPB1 Class A2
10/16/2026
4.375%
 
15,500,000
15,289,104
Starwood Mortgage Residential Trust(a),(g)
CMO Series 2020-3 Class B1
04/25/2065
4.750%
 
4,750,000
4,297,574
CMO Series 2021-3 Class A1
06/25/2056
1.127%
 
3,604,078
3,035,838
Starwood Mortgage Residential Trust(a)
Subordinated CMO Series 2020-INV1 Class B1
11/25/2055
3.257%
 
3,200,000
2,824,459
Subordinated CMO Series 2020-INV1 Class B2
11/25/2055
4.261%
 
1,400,000
1,238,019
Toorak Mortgage Trust(a),(g)
CMO Series 2024-RRTL2 Class M1
09/25/2039
7.257%
 
5,375,000
5,323,762
CMO Series 2025-RRTL1 Class B1
02/25/2040
8.342%
 
3,800,000
3,824,589
Subordinated CMO Series 2024-RRTL1 Class B1
02/25/2039
9.768%
 
5,700,000
5,783,097
Subordinated CMO Series 2024-RRTL2 Class B1
09/25/2039
8.178%
 
2,750,000
2,732,802
Triangle Re Ltd.(a),(d)
CMO Series 2021-2 Class M2
1-month Term SOFR +
5.614%
Floor 5.500%
10/25/2033
9.939%
 
10,000,000
10,244,674
Subordinated CMO Series 2021-2 Class B1
1-month Term SOFR +
7.614%
Floor 7.500%
10/25/2033
11.939%
 
7,100,000
7,440,808
VCAT LLC(a),(k)
CMO Series 2025-NPL2 Class A1
09/25/2054
5.977%
 
8,308,791
8,284,092
Vericrest Opportunity Loan Transferee(a),(k)
CMO Series 2021-NPL4 Class A1
03/27/2051
2.240%
 
2,039,549
2,034,755
Vericrest Opportunity Loan Transferee XCIV LLC(a),(k)
CMO Series 2021-NPL3 Class A1
02/27/2051
2.240%
 
1,292,263
1,292,069
Vericrest Opportunity Loan Transferee XCVI LLC(a),(k)
CMO Series 2021-NPL5 Class A1
03/27/2051
6.116%
 
1,672,372
1,671,350
Vericrest Opportunity Loan Transferee XCVII LLC(a),(k)
CMO Series 2021-NPL6 Class A1
04/25/2051
5.240%
 
2,995,983
2,991,310
Residential Mortgage-Backed Securities - Non-Agency 47.2%
Issuer
Coupon
Rate
 
Principal
Amount ($)
Value ($)
Verus Securitization Trust(a),(g)
CMO Series 2021-4 Class A1
07/25/2066
0.938%
 
7,564,094
6,237,074
Subordinated CMO Series 2020-1 Class B1
01/25/2060
3.624%
 
6,000,000
5,680,359
Subordinated CMO Series 2020-4 Class B2
05/25/2065
5.600%
 
2,000,000
1,978,624
Subordinated CMO Series 2022-2 Class B2
02/25/2067
4.272%
 
4,493,200
3,418,897
Subordinated CMO Series 2023-1 Class B1
12/25/2067
6.883%
 
7,000,000
6,936,250
Subordinated CMO Series 2023-INV1 Class B1
02/25/2068
7.495%
 
4,198,000
4,178,204
Subordinated Series 2021-5 Class B1
09/25/2066
3.037%
 
3,800,000
2,600,374
Subordinated Series 2021-5 Class B2
09/25/2066
3.941%
 
3,500,000
2,480,378
Verus Securitization Trust(a)
CMO Series 2021-R2 Class M1
02/25/2064
2.244%
 
3,781,000
3,297,524
Visio Trust(a),(g)
CMO Series 2019-2 Class M1
11/25/2054
3.260%
 
1,400,000
1,321,987
Subordinated CMO Series 2019-2 Class B1
11/25/2054
3.910%
 
1,200,000
1,139,944
Vista Point Securitization Trust(a),(g)
CMO Series 2024-CES3 Class B1
01/25/2055
7.833%
 
4,700,000
4,729,243
CMO Series 2024-CES3 Class B2
01/25/2055
9.492%
 
2,900,000
2,990,103
CMO Series 2025-CES1 Class B1
04/25/2055
7.621%
 
3,929,000
3,870,560
CMO Series 2025-CES1 Class B2
04/25/2055
8.956%
 
2,546,000
2,497,038
Subordinated CMO Series 2020-1 Class B1
03/25/2065
5.375%
 
2,000,000
1,962,101
Subordinated CMO Series 2024-CES2 Class B1
10/25/2054
7.498%
 
2,500,000
2,504,707
Total Residential Mortgage-Backed Securities - Non-Agency
(Cost $1,010,099,488)
1,029,064,130
 
Call Option Contracts Purchased 0.7%
 
 
 
 
Value ($)
(Cost $22,830,041)
14,002,677
 
Put Option Contracts Purchased 0.4%
 
 
 
 
 
(Cost $10,918,730)
8,750,824
The accompanying Notes to Financial Statements are an integral part of this statement.
16
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
 
Money Market Funds 8.5%
 
Shares
Value ($)
Columbia Short-Term Cash Fund, 4.495%(m),(n)
185,170,885
185,115,334
Total Money Market Funds
(Cost $185,097,222)
185,115,334
Total Investments in Securities
(Cost: $4,629,702,289)
4,495,657,726
Other Assets & Liabilities, Net
(2,314,986,960
)
Net Assets
2,180,670,766
At May 31, 2025, securities and/or cash totaling $74,409,880 were pledged as collateral.
Investments in derivatives 
Long futures contracts
Description
Number of
contracts
Expiration
date
Trading
currency
Notional
amount
Value/Unrealized
appreciation ($)
Value/Unrealized
depreciation ($)
3-Month SOFR
4,962
06/2026
USD
1,196,152,125
1,195,142
U.S. Treasury 5-Year Note
1,370
09/2025
USD
148,216,875
830,843
U.S. Treasury Ultra Bond
105
09/2025
USD
12,186,563
331,055
Total
 
 
 
2,357,040
 
Short futures contracts
Description
Number of
contracts
Expiration
date
Trading
currency
Notional
amount
Value/Unrealized
appreciation ($)
Value/Unrealized
depreciation ($)
3-Month SOFR
(4,962)
06/2025
USD
(1,186,600,275
)
3,214,851
U.S. Long Bond
(3,005)
09/2025
USD
(338,907,656
)
(7,715,581
)
U.S. Treasury 10-Year Note
(15,296)
09/2025
USD
(1,694,032,000
)
(18,918,781
)
U.S. Treasury 2-Year Note
(3,308)
09/2025
USD
(686,203,250
)
(869,686
)
Total
 
 
 
3,214,851
(27,504,048
)
 
Call option contracts purchased
Description
Counterparty
Trading
currency
Notional
amount
Number of
contracts
Exercise
price/Rate
Expiration
date
Cost ($)
Value ($)
10-Year OTC interest rate swap
with Citi to receive exercise
rate and pay SOFR
Citi
USD
212,000,000
212,000,000
3.70
06/12/2025
4,218,800
316,219
10-Year OTC interest rate swap
with Citi to receive exercise
rate and pay SOFR
Citi
USD
95,000,000
95,000,000
3.80
09/12/2025
2,018,750
1,401,355
10-Year OTC interest rate swap
with Citi to receive exercise
rate and pay SOFR
Citi
USD
285,000,000
285,000,000
3.80
10/14/2025
6,013,500
4,874,526
10-Year OTC interest rate swap
with Goldman Sachs
International to receive
exercise rate and pay SOFR
Goldman Sachs International
USD
100,000,000
100,000,000
3.25
08/19/2025
3,065,000
175,750
30-Year OTC interest rate swap
with Citi to receive exercise
rate and pay SOFR
Citi
USD
46,489,600
46,489,600
3.80
10/29/2025
2,277,991
1,114,267
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
17

Portfolio of Investments (continued)
May 31, 2025
Call option contracts purchased (continued)
Description
Counterparty
Trading
currency
Notional
amount
Number of
contracts
Exercise
price/Rate
Expiration
date
Cost ($)
Value ($)
5-Year OTC interest rate swap
with Citi to receive exercise
rate and pay SOFR
Citi
USD
118,000,000
118,000,000
3.90
07/02/2025
1,416,000
1,705,360
5-Year OTC interest rate swap
with Morgan Stanley to receive
exercise rate and pay SOFR
Morgan Stanley
USD
200,000,000
200,000,000
3.75
05/14/2026
3,820,000
4,415,200
Total
 
 
22,830,041
14,002,677
 
Put option contracts purchased
Description
Counterparty
Trading
currency
Notional
amount
Number of
contracts
Exercise
price/Rate
Expiration
date
Cost ($)
Value ($)
10-Year OTC interest rate swap
with Morgan Stanley to receive
SOFR and pay exercise rate
Morgan Stanley
USD
150,000,000
150,000,000
3.90
09/30/2025
2,767,500
2,594,790
5-Year OTC interest rate swap with
Citi to receive SOFR and pay
exercise rate
Citi
USD
190,000,000
190,000,000
4.05
09/05/2025
1,501,000
500,479
5-Year OTC interest rate swap with
Citi to receive SOFR and pay
exercise rate
Citi
USD
378,000,000
378,000,000
4.00
11/10/2025
2,627,100
1,978,301
5-Year OTC interest rate swap with
Citi to receive SOFR and pay
exercise rate
Citi
USD
140,000,000
140,000,000
4.00
11/21/2025
1,255,380
782,978
5-Year OTC interest rate swap with
Goldman Sachs International to
receive SOFR and pay exercise
rate
Goldman Sachs International
USD
113,000,000
113,000,000
3.50
10/03/2025
1,327,750
1,454,276
5-Year OTC interest rate swap with
Morgan Stanley to receive SOFR
and pay exercise rate
Morgan Stanley
USD
150,000,000
150,000,000
3.75
11/28/2025
1,440,000
1,440,000
Total
 
 
10,918,730
8,750,824
 
Call option contracts written
Description
Counterparty
Trading
currency
Notional
amount
Number of
contracts
Exercise
price/Rate
Expiration
date
Premium
received ($)
Value ($)
2-Year OTC interest rate swap with Citi to receive
SOFR and pay exercise rate
Citi
USD
(486,556,000
)
(486,556,000
)
3.25
07/29/2025
(2,150,578
)
(493,903
)
2-Year OTC interest rate swap with Citi to receive
SOFR and pay exercise rate
Citi
USD
(670,000,000
)
(670,000,000
)
3.10
08/01/2025
(2,881,000
)
(484,276
)
Total
 
 
(5,031,578
)
(978,179
)
 
Credit default swap contracts - buy protection
Reference
entity
Counterparty
Maturity
date
Pay
fixed
rate
(%)
Payment
frequency
Notional
currency
Notional
amount
Value
($)
Periodic
payments
receivable
(payable)
($)
Upfront
payments
($)
Upfront
receipts
($)
Unrealized
appreciation
($)
Unrealized
depreciation
($)
CMBX North America
Index, Series 11 BBB-
Citi
11/18/2054
3.000
Monthly
USD
10,000,000
1,297,442
(5,000
)
303,305
989,137
CMBX North America
Index, Series 11 BBB-
Citi
11/18/2054
3.000
Monthly
USD
10,000,000
1,297,442
(5,000
)
1,316,475
(24,033
)
CMBX North America
Index, Series 11 BBB-
Citi
11/18/2054
3.000
Monthly
USD
20,500,000
2,659,756
(10,250
)
4,855,835
(2,206,329
)
The accompanying Notes to Financial Statements are an integral part of this statement.
18
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Credit default swap contracts - buy protection (continued)
Reference
entity
Counterparty
Maturity
date
Pay
fixed
rate
(%)
Payment
frequency
Notional
currency
Notional
amount
Value
($)
Periodic
payments
receivable
(payable)
($)
Upfront
payments
($)
Upfront
receipts
($)
Unrealized
appreciation
($)
Unrealized
depreciation
($)
CMBX North America
Index, Series 11 BBB-
Citi
11/18/2054
3.000
Monthly
USD
50,000,000
6,487,210
(25,000
)
12,636,528
(6,174,318
)
CMBX North America
Index, Series 11 BBB-
Goldman Sachs
International
11/18/2054
3.000
Monthly
USD
10,000,000
1,297,442
(5,000
)
1,420,616
(128,174
)
Total
 
 
 
 
13,039,292
(50,250
)
20,532,759
989,137
(8,532,854
)
 
Credit default swap contracts - sell protection
Reference
entity
Counterparty
Maturity
date
Receive
fixed
rate
(%)
Payment
frequency
Implied
credit
spread
(%)*
Notional
currency
Notional
amount
Value
($)
Periodic
payments
receivable
(payable)
($)
Upfront
payments
($)
Upfront
receipts
($)
Unrealized
appreciation
($)
Unrealized
depreciation
($)
CMBX North
America Index,
Series 10 BBB-
Citi
11/17/2059
3.000
Monthly
20.251
USD
10,000,000
(1,971,880
)
5,000
(2,016,727
)
49,847
CMBX North
America Index,
Series 10 BBB-
Citi
11/17/2059
3.000
Monthly
20.251
USD
20,000,000
(3,943,760
)
10,000
(2,237,404
)
(1,696,356
)
CMBX North
America Index,
Series 16 BBB-
Goldman Sachs
International
04/17/2065
3.000
Monthly
7.048
USD
19,000,000
(3,247,402
)
9,500
(2,448,650
)
(789,252
)
CMBX North
America Index,
Series 17 BBB-
Goldman Sachs
International
12/15/2056
3.000
Monthly
5.728
USD
50,000,000
(6,530,400
)
25,000
(7,560,511
)
1,055,111
CMBX North
America Index,
Series 17 BBB-
Goldman Sachs
International
12/15/2056
3.000
Monthly
5.728
USD
9,500,000
(1,240,776
)
4,750
(1,702,958
)
466,932
CMBX North
America Index,
Series 17 BBB-
Goldman Sachs
International
12/15/2056
3.000
Monthly
5.728
USD
9,500,000
(1,240,776
)
4,750
(1,609,830
)
373,804
CMBX North
America Index,
Series 17 BBB-
Goldman Sachs
International
12/15/2056
3.000
Monthly
5.728
USD
5,000,000
(653,040
)
2,500
(754,636
)
104,096
CMBX North
America Index,
Series 17 BBB-
Goldman Sachs
International
12/15/2056
3.000
Monthly
5.728
USD
12,000,000
(1,567,296
)
6,000
(1,172,399
)
(388,897
)
CMBX North
America Index,
Series 10 BBB-
Morgan Stanley
11/17/2059
3.000
Monthly
20.251
USD
8,800,000
(1,735,255
)
4,400
(1,884,273
)
153,418
CMBX North
America Index,
Series 10 BBB-
Morgan Stanley
11/17/2059
3.000
Monthly
20.251
USD
16,500,000
(3,253,602
)
8,250
(3,015,248
)
(230,104
)
CMBX North
America Index,
Series 10 BBB-
Morgan Stanley
11/17/2059
3.000
Monthly
20.251
USD
13,000,000
(2,563,444
)
6,500
(1,892,099
)
(664,845
)
CMBX North
America Index,
Series 7 BBB-
Morgan Stanley
01/17/2047
3.000
Monthly
24.832
USD
1,102,690
(154,140
)
551
(80,770
)
(72,819
)
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
19

Portfolio of Investments (continued)
May 31, 2025
Credit default swap contracts - sell protection (continued)
Reference
entity
Counterparty
Maturity
date
Receive
fixed
rate
(%)
Payment
frequency
Implied
credit
spread
(%)*
Notional
currency
Notional
amount
Value
($)
Periodic
payments
receivable
(payable)
($)
Upfront
payments
($)
Upfront
receipts
($)
Unrealized
appreciation
($)
Unrealized
depreciation
($)
CMBX North
America Index,
Series 7 BBB-
Morgan Stanley
01/17/2047
3.000
Monthly
24.832
USD
2,162,138
(302,236
)
1,081
(103,972
)
(197,183
)
CMBX North
America Index,
Series 8 BBB-
Morgan Stanley
10/17/2057
3.000
Monthly
35.428
USD
2,171,471
(471,605
)
1,086
(415,728
)
(54,791
)
Total
 
 
 
 
(28,875,612
)
89,368
(26,895,205
)
2,203,208
(4,094,247
)
* Implied credit spreads, represented in absolute terms, utilized in determining the market value of credit default swap agreements on corporate or sovereign issues as of period end serve as an indicator of the current status of the payment/performance risk and represent the likelihood or risk of default for the credit derivative. The implied credit spread of a particular referenced entity reflects the cost of buying/selling protection and may include upfront payments required to be made to enter into the agreement. Wider credit spreads represent a deterioration of the referenced entity’s credit soundness and a greater likelihood or risk of default or other credit event occurring as defined under the terms of the agreement.
Notes to Portfolio of Investments 
(a)
Represents privately placed and other securities and instruments exempt from Securities and Exchange Commission registration (collectively, private placements), such as Section 4(a)(2) and Rule 144A eligible securities, which are often sold only to qualified institutional buyers. At May 31, 2025, the total value of these securities amounted to $1,262,421,586, which represents 57.89% of total net assets.
(b)
Principal amount represents ownership shares of the Trust.
(c)
Security represents a pool of loans that generate cash payments generally over fixed periods of time. Such securities entitle the security holders to receive distributions (i.e. principal and interest, net of fees and expenses) that are tied to the payments made by the borrower on the underlying loans. Due to the structure of the security the cash payments received are not known until the time of payment. The interest rate shown is the stated coupon rate as of May 31, 2025 and is not reflective of the cash flow payments.
(d)
Variable rate security. The interest rate shown was the current rate as of May 31, 2025.
(e)
Valuation based on significant unobservable inputs.
(f)
Represents fair value as determined in good faith under procedures approved by the Board of Trustees. At May 31, 2025, the total value of these securities amounted to $42,524,540, which represents 1.95% of total net assets.
(g)
Variable or floating rate security, the interest rate of which adjusts periodically based on changes in current interest rates and prepayments on the underlying pool of assets. The interest rate shown was the current rate as of May 31, 2025.
(h)
Represents interest only securities which have the right to receive the monthly interest payments on an underlying pool of mortgage loans.
(i)
Represents a security in default.
(j)
Represents a security purchased on a when-issued basis.
(k)
Represents a variable rate security with a step coupon where the rate adjusts according to a schedule for a series of periods, typically lower for an initial period and then increasing to a higher coupon rate thereafter. The interest rate shown was the current rate as of May 31, 2025.
(l)
Zero coupon bond.
(m)
The rate shown is the seven-day current annualized yield at May 31, 2025.
(n)
Under Section 2(a)(3) of the Investment Company Act of 1940, an affiliated company is one in which the Fund owns 5% or more of the company’s outstanding voting securities, or a company which is under common ownership or control with the Fund. The value of the holdings and transactions in these affiliated companies during the year ended May 31, 2025 are as follows:
 
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Realized gain
(loss)($)
Dividends($)
End of
period shares
Columbia Short-Term Cash Fund, 4.495%
 
122,883,619
1,737,012,164
(1,674,772,338
)
(8,111
)
185,115,334
10,760
7,360,475
185,170,885
The accompanying Notes to Financial Statements are an integral part of this statement.
20
Columbia Mortgage Opportunities Fund  | 2025

Portfolio of Investments (continued)
May 31, 2025
Abbreviation Legend 
CMO
Collateralized Mortgage Obligation
SOFR
Secured Overnight Financing Rate
STRIPS
Separate Trading of Registered Interest and Principal Securities
TBA
To Be Announced
Currency Legend 
USD
US Dollar
Fair value measurements  
The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
Fair value inputs are summarized in the three broad levels listed below:

 Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date.  Valuation adjustments are not applied to Level 1 investments.

 Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

 Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).
Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.
Investments falling into the Level 3 category, if any, are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.
The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.
The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.
The following table is a summary of the inputs used to value the Fund’s investments at May 31, 2025: 
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Investments in Securities
Asset-Backed Securities - Non-Agency
175,963,776
49,502,250
225,466,026
Commercial Mortgage-Backed Securities - Agency
3,096,057
3,096,057
Commercial Mortgage-Backed Securities - Non-Agency
39,660,022
39,660,022
Residential Mortgage-Backed Securities - Agency
2,966,894,491
23,608,165
2,990,502,656
Residential Mortgage-Backed Securities - Non-Agency
1,029,064,130
1,029,064,130
Call Option Contracts Purchased
14,002,677
14,002,677
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
21

Portfolio of Investments (continued)
May 31, 2025
Fair value measurements   (continued)
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Put Option Contracts Purchased
8,750,824
8,750,824
Money Market Funds
185,115,334
185,115,334
Total Investments in Securities
185,115,334
4,237,431,977
73,110,415
4,495,657,726
Investments in Derivatives
Asset
Futures Contracts
5,571,891
5,571,891
Swap Contracts
3,192,345
3,192,345
Liability
Futures Contracts
(27,504,048
)
(27,504,048
)
Call Option Contracts Written
(978,179
)
(978,179
)
Swap Contracts
(12,627,101
)
(12,627,101
)
Total
163,183,177
4,227,019,042
73,110,415
4,463,312,634
See the Portfolio of Investments for all investment classifications not indicated in the table.
The Fund’s assets assigned to the Level 2 input category are generally valued using the market approach, in which a security’s value is determined through reference to prices and information from market transactions for similar or identical assets.
Futures contracts and swap contracts are valued at unrealized appreciation (depreciation).
The following table is a reconciliation of Level 3 assets for which significant observable and unobservable inputs were used to determine fair value: 
 
Balance
as of
05/31/2024
($)
Increase
(decrease)
in accrued
discounts/
premiums
($)
Realized
gain (loss)
($)
Change
in unrealized
appreciation
(depreciation)(a)
($)
Purchases
($)
Sales
($)
Transfers
into
Level 3
($)
Transfers
out of
Level 3
($)
Balance
as of
05/31/2025
($)
Asset-Backed Securities —
Non-Agency
30,708,798
(3,340,857
)
(1,395,320
)
61,880
48,599,999
(19,859,829
)
-
(5,272,421
)
49,502,250
Residential Mortgage-Backed
Securities — Agency
-
(1,665
)
-
1,665
23,608,165
-
-
-
23,608,165
Residential Mortgage-Backed
Securities — Non-Agency
90,448,515
306,986
80,646
52,118
-
(63,784,945
)
-
(27,103,320
)
-
Total
121,157,313
(3,035,536
)
(1,314,674
)
115,663
72,208,164
(83,644,774
)
-
(32,375,741
)
73,110,415
(a) Change in unrealized appreciation (depreciation) relating to securities held at May 31, 2025 was $(16,630), which is comprised of Asset-Backed Securities — Non-Agency of $(18,295) and Residential Mortgage-Backed Securities — Agency of $1,665.
Financial assets were transferred from Level 3 to Level 2 as observable market inputs were utilized and management determined that there was sufficient, reliable and observable market data to value these assets as of period end.
The Fund’s assets assigned to the Level 3 category are valued utilizing the valuation technique deemed the most appropriate in the circumstances. The following table is a summary of valuation technique(s) used to value the Fund’s investments at May 31, 2025: 
 
Valuation Technique
Value ($)
Asset-Backed Securities - Non-Agency
Single Market Quotes from Broker
49,502,250
Residential Mortgage-Backed Securities - Agency
Single Market Quotes from Broker
23,608,165
Total
 
73,110,415
The appropriateness of fair values for these securities is monitored on an ongoing basis which may include results of back testing, manual price reviews and other control procedures. Significant increases (decreases) to any of these inputs would have resulted in a significantly higher (lower) fair value measurement.
The accompanying Notes to Financial Statements are an integral part of this statement.
22
Columbia Mortgage Opportunities Fund  | 2025

Statement of Assets and Liabilities
May 31, 2025
 
Assets
Investments in securities, at value
Unaffiliated issuers (cost $4,410,856,296)
$4,287,788,891
Affiliated issuers (cost $185,097,222)
185,115,334
Option contracts purchased (cost $33,748,771)
22,753,501
Cash
405,835
Cash collateral held at broker for:
TBA
11,890,758
Other(a)
12,301,000
Margin deposits on:
Futures contracts
50,218,122
Unrealized appreciation on swap contracts
3,192,345
Upfront payments on swap contracts
20,532,759
Receivable for:
Capital shares sold
1,962,902
Dividends
723,694
Interest
10,914,530
Variation margin for futures contracts
459,740
Expense reimbursement due from Investment Manager
815
Prepaid expenses
6,001
Other assets
5,569
Total assets
4,608,271,796
Liabilities
Option contracts written, at value (premiums received $5,031,578)
978,179
Unrealized depreciation on swap contracts
12,627,101
Upfront receipts on swap contracts
26,895,205
Payable for:
Investments purchased
1,440,001
Investments purchased on a delayed delivery basis
2,382,855,630
Capital shares redeemed
1,114,012
Variation margin for futures contracts
1,256,689
Management services fees
37,961
Distribution and/or service fees
4,412
Transfer agent fees
160,248
Compensation of board members
3,547
Other expenses
103,644
Deferred compensation of board members
124,401
Total liabilities
2,427,601,030
Net assets applicable to outstanding capital stock
$2,180,670,766
Represented by
Paid in capital
3,107,719,880
Total distributable earnings (loss)
(927,049,114
)
Total - representing net assets applicable to outstanding capital stock
$2,180,670,766
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
23

Statement of Assets and Liabilities (continued)
May 31, 2025
Class A
Net assets
$506,120,567
Shares outstanding
60,864,193
Net asset value per share
$8.32
Maximum sales charge
3.00%
Maximum offering price per share (calculated by dividing the net asset value per share by 1.0 minus the maximum sales charge for Class A shares)
$8.58
Class C
Net assets
$35,139,997
Shares outstanding
4,227,952
Net asset value per share
$8.31
Institutional Class
Net assets
$1,115,248,174
Shares outstanding
134,225,589
Net asset value per share
$8.31
Institutional 2 Class
Net assets
$310,590,352
Shares outstanding
37,415,437
Net asset value per share
$8.30
Institutional 3 Class
Net assets
$207,303,763
Shares outstanding
24,940,483
Net asset value per share
$8.31
Class S
Net assets
$6,267,913
Shares outstanding
754,207
Net asset value per share
$8.31
 
(a)
Includes collateral related to option contracts purchased and swap Contracts.
The accompanying Notes to Financial Statements are an integral part of this statement.
24
Columbia Mortgage Opportunities Fund  | 2025

Statement of Operations
Year Ended May 31, 2025
 
Net investment income
Income:
Dividends — affiliated issuers
$7,360,475
Interest
134,777,647
Interfund lending
1,516
Total income
142,139,638
Expenses:
Management services fees
14,345,650
Distribution and/or service fees
Class A
1,099,997
Class C
374,457
Transfer agent fees
Class A
452,019
Advisor Class
46,439
Class C
38,281
Institutional Class
1,136,269
Institutional 2 Class
228,474
Institutional 3 Class
10,921
Class S
4,843
Custodian fees
49,699
Printing and postage fees
121,368
Registration fees
143,973
Accounting services fees
54,565
Legal fees
43,195
Interest on collateral
1,631,035
Compensation of chief compliance officer
390
Compensation of board members
34,878
Deferred compensation of board members
15,557
Other
53,085
Total expenses
19,885,095
Fees waived or expenses reimbursed by Investment Manager and its affiliates
(470,882
)
Total net expenses
19,414,213
Net investment income
122,725,425
Realized and unrealized gain (loss) — net
Net realized gain (loss) on:
Investments — unaffiliated issuers
19,192,065
Investments — affiliated issuers
10,760
Futures contracts
45,484,220
Option contracts purchased
(15,747,365
)
Option contracts written
3,417,000
Swap contracts
16,456,179
Net realized gain
68,812,859
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated issuers
87,997,387
Investments — affiliated issuers
(8,111
)
Futures contracts
(29,802,888
)
Option contracts purchased
13,474,181
Option contracts written
4,053,399
Swap contracts
1,404,566
Net change in unrealized appreciation (depreciation)
77,118,534
Net realized and unrealized gain
145,931,393
Net increase in net assets resulting from operations
$268,656,818
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
25

Statement of Changes in Net Assets
 
 
Year Ended
May 31, 2025
Year Ended
May 31, 2024
Operations
Net investment income
$122,725,425
$146,588,467
Net realized gain (loss)
68,812,859
(207,530,983
)
Net change in unrealized appreciation (depreciation)
77,118,534
131,793,618
Net increase in net assets resulting from operations
268,656,818
70,851,102
Distributions to shareholders
Net investment income and net realized gains
Class A
(24,104,834
)
(23,110,478
)
Advisor Class
(2,857,185
)
(7,461,286
)
Class C
(1,761,197
)
(2,372,287
)
Institutional Class
(63,260,379
)
(77,074,074
)
Institutional 2 Class
(23,686,100
)
(32,329,358
)
Institutional 3 Class
(11,605,473
)
(13,654,627
)
Class S
(261,266
)
Total distributions to shareholders
(127,536,434
)
(156,002,110
)
Decrease in net assets from capital stock activity
(177,159,670
)
(204,834,427
)
Total decrease in net assets
(36,039,286
)
(289,985,435
)
Net assets at beginning of year
2,216,710,052
2,506,695,487
Net assets at end of year
$2,180,670,766
$2,216,710,052
The accompanying Notes to Financial Statements are an integral part of this statement.
26
Columbia Mortgage Opportunities Fund  | 2025

Statement of Changes in Net Assets  (continued)
 
 
Year Ended
Year Ended
 
May 31, 2025
May 31, 2024
 
Shares
Dollars ($)
Shares
Dollars ($)
Capital stock activity
Class A
Shares sold
17,376,006
143,611,861
8,577,622
67,302,962
Distributions reinvested
2,949,208
24,096,002
2,957,553
23,099,138
Shares redeemed
(6,873,532
)
(55,991,963
)
(7,893,149
)
(61,576,805
)
Net increase
13,451,682
111,715,900
3,642,026
28,825,295
Advisor Class
Shares sold
2,845,268
23,436,015
6,327,173
49,547,940
Distributions reinvested
351,002
2,857,185
957,392
7,455,804
Shares redeemed
(14,975,873
)
(121,044,213
)
(14,043,852
)
(108,896,040
)
Net decrease
(11,779,603
)
(94,751,013
)
(6,759,287
)
(51,892,296
)
Class C
Shares sold
528,799
4,345,285
663,519
5,247,208
Distributions reinvested
214,426
1,751,296
302,308
2,357,517
Shares redeemed
(1,342,869
)
(10,979,740
)
(2,446,178
)
(19,207,164
)
Net decrease
(599,644
)
(4,883,159
)
(1,480,351
)
(11,602,439
)
Institutional Class
Shares sold
55,551,651
454,050,327
68,544,782
540,415,458
Distributions reinvested
7,721,607
63,024,098
9,757,906
76,103,144
Shares redeemed
(66,061,380
)
(540,560,113
)
(108,389,949
)
(845,887,178
)
Net decrease
(2,788,122
)
(23,485,688
)
(30,087,261
)
(229,368,576
)
Institutional 2 Class
Shares sold
19,328,814
158,943,480
37,204,763
291,830,318
Distributions reinvested
2,901,113
23,647,514
4,135,752
32,223,277
Shares redeemed
(42,134,775
)
(343,177,256
)
(36,280,563
)
(283,925,279
)
Net increase (decrease)
(19,904,848
)
(160,586,262
)
5,059,952
40,128,316
Institutional 3 Class
Shares sold
5,357,975
44,107,335
8,582,439
67,605,908
Distributions reinvested
1,421,039
11,604,807
1,739,952
13,579,990
Shares redeemed
(8,208,648
)
(67,196,439
)
(7,963,771
)
(62,110,625
)
Net increase (decrease)
(1,429,634
)
(11,484,297
)
2,358,620
19,075,273
Class S
Shares sold
1,163,388
9,641,536
Distributions reinvested
32,027
261,230
Shares redeemed
(441,208
)
(3,587,917
)
Net increase
754,207
6,314,849
Total net decrease
(22,295,962
)
(177,159,670
)
(27,266,301
)
(204,834,427
)
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
27

Financial Highlights
The following table is intended to help you understand the Fund’s financial performance. Certain information reflects financial results for a single share of a class held for the periods shown. Per share net investment income (loss) amounts are calculated based on average shares outstanding during the period. Total return assumes reinvestment of all dividends and distributions, if any. Total return does not reflect payment of sales charges, if any. Total return and portfolio turnover are not annualized for periods of less than one year. The ratios of expenses and net investment income are annualized for periods of less than one year. The portfolio turnover rate is calculated without regard to purchase and sales transactions of short-term instruments and certain derivatives, if any. If such transactions were included, the Fund’s portfolio turnover rate may be higher.  
 
Net asset value,
beginning of
period
Net
investment
income
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class A
Year Ended 5/31/2025
$7.79
0.43
0.55
0.98
(0.45
)
(0.45
)
Year Ended 5/31/2024
$8.04
0.46
(0.21
)
0.25
(0.50
)
(0.50
)
Year Ended 5/31/2023
$9.59
0.56
(1.54
)
(0.98
)
(0.57
)
(0.57
)
Year Ended 5/31/2022
$10.87
0.48
(1.30
)
(0.82
)
(0.40
)
(0.06
)
(0.46
)
Year Ended 5/31/2021
$9.35
0.47
1.66
2.13
(0.43
)
(0.18
)
(0.61
)
Class C
Year Ended 5/31/2025
$7.79
0.37
0.54
0.91
(0.39
)
(0.39
)
Year Ended 5/31/2024
$8.04
0.41
(0.22
)
0.19
(0.44
)
(0.44
)
Year Ended 5/31/2023
$9.58
0.50
(1.53
)
(1.03
)
(0.51
)
(0.51
)
Year Ended 5/31/2022
$10.87
0.39
(1.30
)
(0.91
)
(0.32
)
(0.06
)
(0.38
)
Year Ended 5/31/2021
$9.35
0.40
1.65
2.05
(0.35
)
(0.18
)
(0.53
)
Institutional Class
Year Ended 5/31/2025
$7.79
0.45
0.54
0.99
(0.47
)
(0.47
)
Year Ended 5/31/2024
$8.03
0.49
(0.21
)
0.28
(0.52
)
(0.52
)
Year Ended 5/31/2023
$9.58
0.59
(1.55
)
(0.96
)
(0.59
)
(0.59
)
Year Ended 5/31/2022
$10.86
0.49
(1.28
)
(0.79
)
(0.43
)
(0.06
)
(0.49
)
Year Ended 5/31/2021
$9.35
0.50
1.65
2.15
(0.46
)
(0.18
)
(0.64
)
Institutional 2 Class
Year Ended 5/31/2025
$7.78
0.45
0.54
0.99
(0.47
)
(0.47
)
Year Ended 5/31/2024
$8.03
0.49
(0.22
)
0.27
(0.52
)
(0.52
)
Year Ended 5/31/2023
$9.58
0.59
(1.54
)
(0.95
)
(0.60
)
(0.60
)
Year Ended 5/31/2022
$10.86
0.50
(1.29
)
(0.79
)
(0.43
)
(0.06
)
(0.49
)
Year Ended 5/31/2021
$9.35
0.50
1.65
2.15
(0.46
)
(0.18
)
(0.64
)
The accompanying Notes to Financial Statements are an integral part of this statement.
28
Columbia Mortgage Opportunities Fund  | 2025

Financial Highlights (continued)
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class A
Year Ended 5/31/2025
$8.32
12.79%
1.08%
(c)
1.06%
(c)
5.27%
706%
$506,121
Year Ended 5/31/2024
$7.79
3.24%
1.06%
(c)
1.04%
(c)
5.91%
713%
$369,398
Year Ended 5/31/2023
$8.04
(10.26%
)
1.03%
(c)
1.03%
(c),(d)
6.60%
624%
$351,898
Year Ended 5/31/2022
$9.59
(7.79%
)
0.99%
(c)
0.99%
(c),(d)
4.58%
340%
$409,868
Year Ended 5/31/2021
$10.87
23.28%
1.01%
(c)
1.00%
(c),(d)
4.56%
496%
$191,161
Class C
Year Ended 5/31/2025
$8.31
11.82%
1.83%
(c)
1.81%
(c)
4.49%
706%
$35,140
Year Ended 5/31/2024
$7.79
2.47%
1.81%
(c)
1.79%
(c)
5.17%
713%
$37,592
Year Ended 5/31/2023
$8.04
(10.84%
)
1.78%
(c)
1.78%
(c),(d)
5.85%
624%
$50,691
Year Ended 5/31/2022
$9.58
(8.57%
)
1.74%
(c)
1.74%
(c),(d)
3.70%
340%
$76,327
Year Ended 5/31/2021
$10.87
22.37%
1.76%
(c)
1.75%
(c),(d)
3.82%
496%
$71,915
Institutional Class
Year Ended 5/31/2025
$8.31
12.94%
0.83%
(c)
0.81%
(c)
5.50%
706%
$1,115,248
Year Ended 5/31/2024
$7.79
3.64%
0.81%
(c)
0.79%
(c)
6.17%
713%
$1,066,730
Year Ended 5/31/2023
$8.03
(10.04%
)
0.78%
(c)
0.77%
(c),(d)
6.84%
624%
$1,342,560
Year Ended 5/31/2022
$9.58
(7.56%
)
0.74%
(c)
0.74%
(c),(d)
4.72%
340%
$2,150,404
Year Ended 5/31/2021
$10.86
23.48%
0.76%
(c)
0.75%
(c),(d)
4.80%
496%
$2,005,278
Institutional 2 Class
Year Ended 5/31/2025
$8.30
13.01%
0.79%
(c)
0.77%
(c)
5.48%
706%
$310,590
Year Ended 5/31/2024
$7.78
3.56%
0.77%
(c)
0.75%
(c)
6.21%
713%
$445,987
Year Ended 5/31/2023
$8.03
(10.01%
)
0.74%
(c)
0.74%
(c)
6.87%
624%
$419,706
Year Ended 5/31/2022
$9.58
(7.52%
)
0.70%
(c)
0.70%
(c)
4.76%
340%
$644,830
Year Ended 5/31/2021
$10.86
23.53%
0.72%
(c)
0.71%
(c)
4.82%
496%
$794,473
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
29

Financial Highlights (continued)
 
 
Net asset value,
beginning of
period
Net
investment
income
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Institutional 3 Class
Year Ended 5/31/2025
$7.79
0.46
0.53
0.99
(0.47
)
(0.47
)
Year Ended 5/31/2024
$8.04
0.49
(0.22
)
0.27
(0.52
)
(0.52
)
Year Ended 5/31/2023
$9.59
0.60
(1.55
)
(0.95
)
(0.60
)
(0.60
)
Year Ended 5/31/2022
$10.87
0.49
(1.27
)
(0.78
)
(0.44
)
(0.06
)
(0.50
)
Year Ended 5/31/2021
$9.35
0.51
1.66
2.17
(0.47
)
(0.18
)
(0.65
)
Class S
Year Ended 5/31/2025(e)
$8.43
0.29
(0.11
)(f)
0.18
(0.30
)
(0.30
)
 
Notes to Financial Highlights
(a)
In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)
Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)
Ratios include interest on collateral expense. For the periods indicated below, if interest on collateral expense had been excluded, expenses would have been lower by:
 
Class
5/31/2025
5/31/2024
5/31/2023
5/31/2022
5/31/2021
Class A
0.07%
0.05%
0.03%
less than 0.01%
less than 0.01%
Class C
0.07%
0.05%
0.03%
less than 0.01%
less than 0.01%
Institutional Class
0.07%
0.05%
0.02%
less than 0.01%
less than 0.01%
Institutional 2 Class
0.08%
0.05%
0.03%
less than 0.01%
less than 0.01%
Institutional 3 Class
0.07%
0.05%
0.02%
less than 0.01%
less than 0.01%
Class S
0.07%
—%
—%
—%
—%
 
(d)
The benefits derived from expense reductions had an impact of less than 0.01%.
(e)
Class S shares commenced operations on October 2, 2024. Per share data and total return reflect activity from that date.
(f)
Calculation of the net gain (loss) per share (both realized and unrealized) does not correlate to the aggregate realized and unrealized gain (loss) presented in the Statement of Operations due to timing of Fund shares sold and redeemed in relation to fluctuations in the market value of the portfolio. For a new share class, the difference may be due to the timing of the commencement of operations for the share class.
The accompanying Notes to Financial Statements are an integral part of this statement.
30
Columbia Mortgage Opportunities Fund  | 2025

Financial Highlights (continued)
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Institutional 3 Class
Year Ended 5/31/2025
$8.31
13.04%
0.74%
(c)
0.72%
(c)
5.59%
706%
$207,304
Year Ended 5/31/2024
$7.79
3.60%
0.72%
(c)
0.70%
(c)
6.25%
713%
$205,398
Year Ended 5/31/2023
$8.04
(9.95%
)
0.69%
(c)
0.68%
(c)
6.96%
624%
$193,010
Year Ended 5/31/2022
$9.59
(7.47%
)
0.65%
(c)
0.65%
(c)
4.65%
340%
$301,924
Year Ended 5/31/2021
$10.87
23.71%
0.67%
(c)
0.66%
(c)
4.92%
496%
$493,593
Class S
Year Ended 5/31/2025
(e)
$8.31
2.28%
0.84%
(c)
0.81%
(c)
5.52%
706%
$6,268
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Mortgage Opportunities Fund  | 2025
31

Notes to Financial Statements
May 31, 2025
Note 1. Organization
Columbia Mortgage Opportunities Fund (the Fund), a series of Columbia Funds Series Trust II (the Trust), is a diversified fund. The Trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Massachusetts business trust.
Fund shares
The Trust may issue an unlimited number of shares (without par value). The Fund offers each of the share classes listed in the Statement of Assets and Liabilities. Although all share classes generally have identical voting, dividend and liquidation rights, each share class votes separately when required by the Trust’s organizational documents or by law. Each share class has its own expense and sales charge structure. Different share classes may have different minimum initial investment amounts and pay different net investment income distribution amounts to the extent the expenses of distributing such share classes vary. Distributions to shareholders in a liquidation will be proportional to the net asset value of each share class.
As described in the Fund’s prospectus, Class A and Class C shares are offered to the general public for investment. Class C shares automatically convert to Class A shares after 8 years. Institutional Class, Institutional 2 Class, Institutional 3 Class and Class S shares are available for purchase through authorized investment professionals to omnibus retirement plans or to institutional investors and to certain other investors as also described in the Fund’s prospectus. Class S shares commenced operations on October 2, 2024.
The Board of Trustees of the Fund approved a proposal to permit the exchange of Institutional Class shares held by certain financial intermediaries and omnibus group retirement plans, with specific permission from Columbia Management Investment Distributors, Inc., for newly created Class S shares. Effective on October 4, 2024, shares held by those certain Institutional Class shareholders of the Fund were exchanged for Class S shares of the Fund. This was a tax-free transaction for existing Institutional Class shareholders.
In addition, the Board of Trustees of the Fund approved the conversion of all Advisor Class shares of the Fund to Institutional Class shares of the Fund and the subsequent elimination of Advisor Class shares. Effective on November 22, 2024, Advisor Class shares of the Fund were converted to Institutional Class shares of the Fund. This was a tax-free transaction for existing Advisor Class shareholders.
Note 2. Summary of significant accounting policies
Basis of preparation
The Fund is an investment company that applies the accounting and reporting guidance in the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946, Financial Services - Investment Companies (ASC 946). The financial statements are prepared in accordance with U.S. generally accepted accounting principles (GAAP), which requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates.
The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements.
Segment reporting
In this reporting period, the Fund adopted FASB Accounting Standards Update 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures (ASU 2023-07). Adoption of the new standard impacted financial statement disclosures only and did not affect the Fund’s financial position or its results of operations. The intent of the ASU 2023-07 is to enable investors to better understand an entity’s overall performance and to assess its potential future cash flows through improved segment disclosures.
32
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
The chief operating decision maker (CODM) for the Fund is Columbia Management Investment Advisers, LLC through its Investment Oversight Committee and Global Executive Group, which are responsible for assessing performance and making decisions about resource allocation. The CODM has determined that the Fund has a single operating segment because the CODM monitors the operating results of the Fund as a whole and the Fund’s long-term strategic asset allocation is pre-determined in accordance with the terms of its prospectus, based on a defined investment strategy which is executed by the Fund’s portfolio managers as a team. The financial information provided to and reviewed by the CODM is consistent with that presented within the Fund’s financial statements.
Security valuation
Asset- and mortgage-backed securities are generally valued by pricing services, which utilize pricing models that incorporate the securities’ cash flow and loan performance data. These models also take into account available market data, including trades, market quotations, and benchmark yield curves for identical or similar securities. Factors used to identify similar securities may include, but are not limited to, issuer, collateral type, vintage, prepayment speeds, collateral performance, credit ratings, credit enhancement and expected life. Asset-backed securities for which quotations are readily available may also be valued based upon an over-the-counter or exchange bid quote from an approved independent broker-dealer. Debt securities maturing in 60 days or less are valued primarily at amortized market value, unless this method results in a valuation that management believes does not approximate fair value.
Investments in open-end investment companies (other than exchange-traded funds (ETFs)), are valued at the latest net asset value reported by those companies as of the valuation time.
Futures and options on futures contracts are valued based upon the settlement price at the close of regular trading on their principal exchanges or, in the absence of a settlement price, at the mean of the latest quoted bid and ask prices.
Option contracts are valued at the mean of the latest quoted bid and ask prices on their primary exchanges. Option contracts, including over-the-counter option contracts, with no readily available market quotations are valued using mid-market evaluations from independent third-party vendors.
Swap transactions are valued through an independent pricing service or broker, or if neither is available, through an internal model based upon observable inputs.
Investments for which market quotations are not readily available, or that have quotations which management believes are not reflective of market value or reliable, are valued at fair value as determined in good faith under procedures approved by the Board of Trustees. If a security or class of securities (such as foreign securities) is valued at fair value, such value is likely to be different from the quoted or published price for the security, if available.
The determination of fair value often requires significant judgment. To determine fair value, management may use assumptions including but not limited to future cash flows and estimated risk premiums. Multiple inputs from various sources may be used to determine fair value.
GAAP requires disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category. This information is disclosed following the Fund’s Portfolio of Investments.
Derivative instruments
The Fund invests in certain derivative instruments, as detailed below, in seeking to meet its investment objectives. Derivatives are instruments whose values depend on, or are derived from, in whole or in part, the value of one or more securities, currencies, commodities, indices, or other assets or instruments. Derivatives may be used to increase investment flexibility (including to maintain cash reserves while maintaining desired exposure to certain assets), for risk management (hedging) purposes, to facilitate trading, to reduce transaction costs and to pursue higher investment returns. The Fund may also use derivative instruments to mitigate certain investment risks, such as foreign currency exchange rate risk, interest rate risk and credit risk. Derivatives may involve various risks, including the potential inability of the counterparty to fulfill its obligations under the terms of the contract, the potential for an illiquid secondary market (making it difficult for the Fund to sell or terminate, including at favorable prices) and the potential for market movements which may expose the Fund to gains
Columbia Mortgage Opportunities Fund  | 2025
33

Notes to Financial Statements (continued)
May 31, 2025
or losses in excess of the amount shown in the Statement of Assets and Liabilities. The notional exposure of a financial instrument is the nominal or face amount that is used to calculate payments made on that instrument and/or changes in value for the instrument. The notional exposure is a hypothetical underlying quantity upon which payment obligations are computed. Notional exposures provide a gauge for how the Fund may behave given changes in the underlying rate, asset or reference instrument and individual markets. The notional amounts of derivative instruments, if applicable, are not recorded in the financial statements.
A derivative instrument may suffer a marked-to-market loss if the value of the contract decreases due to an unfavorable change in the market rates or values of the underlying instrument. Losses can also occur if the counterparty does not perform its obligations under the contract. The Fund’s risk of loss from counterparty credit risk on over-the-counter derivatives is generally expected to be limited to the aggregate unrealized gain netted against any collateral held by the Fund and the amount of any variation margin held by the counterparty, plus any replacement costs or related amounts. With exchange-traded or centrally cleared derivatives, there is reduced counterparty credit risk to the Fund since the clearinghouse or central counterparty provides some protection in the case of clearing member default. The clearinghouse or central counterparty stands between the buyer and the seller of the contract; therefore, failure of the clearinghouse or central counterparty may pose additional counterparty credit risk. However, credit risk still exists in exchange-traded or centrally cleared derivatives with respect to initial and variation margin that is held in a broker’s customer account. While clearing brokers are required to segregate customer margin from their own assets, in the event that a clearing broker becomes insolvent or goes into bankruptcy and at that time there is a shortfall in the aggregate amount of margin held by the clearing broker for all its clients and such shortfall is remedied by the central counterparty or otherwise, U.S. bankruptcy laws will typically allocate that shortfall on a pro-rata basis across all the clearing broker’s customers (including the Fund), potentially resulting in losses to the Fund.
In order to better define its contractual rights and to secure rights that will help the Fund mitigate its counterparty risk in respect of over-the-counter derivatives, the Fund may enter into an International Swaps and Derivatives Association, Inc. Master Agreement (ISDA Master Agreement) or similar agreement with its derivatives counterparties. An ISDA Master Agreement is an agreement between the Fund and a counterparty that governs over-the-counter derivatives and foreign exchange forward contracts and contains, among other things, collateral posting terms and netting provisions in the event of a default and/or termination event. Under an ISDA Master Agreement, the Fund may, under certain circumstances, offset with the counterparty certain derivative instruments’ payables and/or receivables with collateral held and/or posted and create one single net payment. The provisions of the ISDA Master Agreement typically permit a single net payment in the event of default (close-out netting), including the bankruptcy or insolvency of the counterparty. Note, however, that bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against the right of offset or netting in bankruptcy, insolvency or other events.
Collateral (margin) requirements differ by type of derivative. Margin requirements are established by the clearinghouse or central counterparty for exchange-traded and centrally cleared derivatives. Brokers can ask for margin in excess of the minimum in certain circumstances. Collateral terms for most over-the-counter derivatives are subject to regulatory requirements to exchange variation margin with trading counterparties and may have contract specific margin terms as well. For over-the-counter derivatives traded under an ISDA Master Agreement, the collateral requirements are typically calculated by netting the marked-to-market amount for each transaction under such agreement and comparing that amount to the value of any variation margin currently pledged by the Fund and/or the counterparty. Generally, the amount of collateral due from or to a party has to exceed a minimum transfer amount threshold (e.g., $250,000) before a transfer has to be made. To the extent amounts due to the Fund from its counterparties are not fully collateralized, contractually or otherwise, the Fund bears the risk of loss from counterparty nonperformance. The Fund may also pay interest expense on cash collateral received from the broker or receive interest income on cash collateral pledged to the broker. The Fund attempts to mitigate counterparty risk by only entering into agreements with counterparties that it believes have the financial resources to honor their obligations and by monitoring the financial stability of those counterparties.
Certain ISDA Master Agreements allow counterparties of over-the-counter derivatives transactions to terminate derivatives contracts prior to maturity in the event the Fund’s net asset value declines by a stated percentage over a specified time period or if the Fund fails to meet certain terms of the ISDA Master Agreement, which would cause the Fund to accelerate payment of any net liability owed to the counterparty.  The Fund also has termination rights if the counterparty fails to meet
34
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
certain terms of the ISDA Master Agreement.  In determining whether to exercise such termination rights, the Fund would consider, in addition to counterparty credit risk, whether termination would result in a net liability owed from the counterparty.
For financial reporting purposes, the Fund does not offset derivative assets and derivative liabilities that are subject to netting arrangements in the Statement of Assets and Liabilities.
Futures contracts
Futures contracts are exchange-traded and represent commitments for the future purchase or sale of an asset at a specified price on a specified date. The Fund bought and sold futures contracts to manage the duration and yield curve exposure of the Fund versus the benchmark and to manage exposure to movements in interest rates. These instruments may be used for other purposes in future periods. Upon entering into futures contracts, the Fund bears risks that it may not achieve the anticipated benefits of the futures contracts and may realize a loss. Additional risks include counterparty credit risk, the possibility of an illiquid market, and that a change in the value of the contract or option may not correlate with changes in the value of the underlying asset.
Upon entering into a futures contract, the Fund deposits cash or securities with the broker, known as a futures commission merchant (FCM), in an amount sufficient to meet the initial margin requirement. The initial margin deposit must be maintained at an established level over the life of the contract. Cash deposited as initial margin is recorded in the Statement of Assets and Liabilities as margin deposits. Securities deposited as initial margin are designated in the Portfolio of Investments. Subsequent payments (variation margin) are made or received by the Fund each day. The variation margin payments are equal to the daily change in the contract value and are recorded as variation margin receivable or payable and are offset in unrealized gains or losses. The Fund generally expects to earn interest income on its margin deposits. The Fund recognizes a realized gain or loss when the contract is closed or expires. Futures contracts involve, to varying degrees, risk of loss in excess of the variation margin disclosed in the Statement of Assets and Liabilities.
Options contracts
Options are contracts which entitle the holder to purchase or sell securities or other identified assets at a specified price, or in the case of index option contracts, to receive or pay the difference between the index value and the strike price of the index option contract. Option contracts can be either exchange-traded or over-the-counter. The Fund purchased and has written option contracts to manage exposure to fluctuations in interest rates and to manage convexity risk. These instruments may be used for other purposes in future periods. Completion of transactions for option contracts traded in the over-the-counter market depends upon the performance of the other party. Collateral may be collected or posted by the Fund to secure over-the-counter option contract trades. Collateral held or posted by the Fund for such option contract trades must be returned to the broker or the Fund upon closure, exercise or expiration of the contract.
Options contracts purchased are recorded as investments. When the Fund writes an options contract, the premium received is recorded as an asset and an amount equivalent to the premium is recorded as a liability in the Statement of Assets and Liabilities and is subsequently adjusted to reflect the current fair value of the option written. Changes in the fair value of the written option are recorded as unrealized appreciation or depreciation until the contract is exercised or has expired. The Fund realizes a gain or loss when the option contract is closed or expires. When option contracts are exercised, the proceeds on sales for a written call or purchased put option contract, or the purchase cost for a written put or purchased call option contract, is adjusted by the amount of premium received or paid.
For over-the-counter options purchased, the Fund bears the risk of loss of the amount of the premiums paid plus the positive change in market values net of any collateral held by the Fund should the counterparty fail to perform under the contracts. Option contracts written by the Fund do not typically give rise to significant counterparty credit risk, as options written generally obligate the Fund and not the counterparty to perform. The risk in writing a call option contract is that the Fund gives up the opportunity for profit if the market price of the security increases above the strike price and the option contract is exercised. The risk in writing a put option contract is that the Fund may incur a loss if the market price of the security decreases below the strike price and the option contract is exercised. Exercise of a written option could result in the
Columbia Mortgage Opportunities Fund  | 2025
35

Notes to Financial Statements (continued)
May 31, 2025
Fund purchasing or selling a security or foreign currency when it otherwise would not, or at a price different from the current market value. In purchasing and writing options, the Fund bears the risk of an unfavorable change in the value of the underlying instrument or the risk that the Fund may not be able to enter into a closing transaction due to an illiquid market.
Interest rate swaption contracts
Interest rate swaption contracts entered into by the Fund typically represent an option that gives the purchaser the right, but not the obligation, to enter into an interest rate swap contract on a future date. Each interest rate swaption contract will specify if the buyer is entitled to receive the fixed or floating rate if the interest rate is exercised. Changes in the value of purchased interest rate swaption contracts are reported as unrealized appreciation or depreciation on options in the Statement of Assets and Liabilities. Gain or loss is recognized in the Statement of Operations when the interest rate swaption contract is closed or expires.
When the Fund writes an interest rate swaption contract, the premium received is recorded as an asset and an amount equivalent to the premium is recorded as a liability in the Statement of Assets and Liabilities and is subsequently adjusted to reflect the current fair value of the interest rate swaption contract written. Premiums received from writing interest rate swaption contracts that expire unexercised are recorded by the Fund on the expiration date as realized gains from options written in the Statement of Operations. The difference between the premium and the amount paid on effecting a closing purchase transaction, including brokerage commissions, is also recorded as realized gain, or if the premium is less than the amount paid for the closing purchase, as realized loss. These amounts are reflected as net realized gain (loss) on options written in the Statement of Operations.
Swap contracts
Swap contracts are negotiated in the over-the-counter market and are entered into bilaterally or centrally cleared (centrally cleared swap contract). In a centrally cleared swap contract, immediately following execution of the swap contract with a broker, the swap contract is novated to a central counterparty and the central counterparty becomes the Fund’s counterparty to the centrally cleared swap contract. The Fund is required to deposit initial margin with the futures commission merchant (FCM), which pledges it through to the central counterparty in the form of cash or securities in an amount that varies depending on the size and risk profile of the particular swap contract. Securities deposited as initial margin are designated in the Portfolio of Investments and cash deposited is recorded in the Statement of Assets and Liabilities as margin deposits. For a bilateral swap contract, the Fund has credit exposure to the broker, but exchanges daily variation margin with the broker based on the mark-to-market value of the swap contract to minimize that exposure. For centrally cleared swap contracts, there is less credit exposure to the FCM than in the case of an over-the-counter derivative, because the central counterparty stands between the Fund and the relevant buyer/seller on the other side of the contract. Swap contracts are marked-to-market daily and changes in value are recorded as unrealized appreciation (depreciation). The daily change in valuation of centrally cleared swap contracts, if any, is recorded as a receivable or payable for variation margin in the Statement of Assets and Liabilities.
Entering into these contracts involves, to varying degrees, elements of interest, liquidity and counterparty credit risk in excess of the amounts recognized in the Statement of Assets and Liabilities. Such risks involve the possibility that there may be unfavorable changes in interest rates, market conditions or other conditions, that it may be difficult to initiate a swap transaction or liquidate a position at an advantageous time or price which may result in significant losses, and that the bilateral counterparty, FCM or central counterparty, as applicable, may not fulfill its obligation under the contract.
Credit default swap contracts
The Fund entered into credit default swap contracts to increase or decrease its credit exposure to an index and to increase or decrease its credit exposure to a specific debt security or a basket of debt securities, as a protection buyer, to reduce overall credit exposure. These instruments may be used for other purposes in future periods. Credit default swap contracts are transactions in which one party pays fixed periodic payments to a counterparty in consideration for an agreement from the counterparty to make a specific payment should a specified credit event(s) take place. Although specified credit events are contract specific, credit events are typically bankruptcy, failure to pay, restructuring, obligation acceleration, obligation default, or repudiation/moratorium.
36
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
As the purchaser of a credit default swap contract, the Fund purchases protection by paying a periodic interest rate on the notional amount to the counterparty. The interest amount is accrued daily as a component of unrealized appreciation (depreciation) and is recorded as a realized loss upon payment. If a credit event as specified in the contract occurs, the Fund may have the option either to deliver the reference obligation to the seller in exchange for a cash payment of its par amount, or to receive a net cash settlement equal to the par amount less an agreed-upon value of the reference obligation as of the date of the credit event. The difference between the value of the obligation or cash delivered and the notional amount received will be recorded as a realized gain (loss).
As the seller of a credit default swap contract, the Fund sells protection to a buyer and will generally receive a periodic interest rate on a notional amount. The interest amount is accrued daily as a component of unrealized appreciation (depreciation) and is recorded as a realized gain upon receipt of the payment. If a credit event as specified in the contract with the counterparty occurs, the Fund may either be required to accept the reference obligation from the buyer in exchange for a cash payment of its notional amount, or to pay the buyer a net cash settlement equal to the notional amount less an agreed-upon value of the reference obligation (recovery value) as of the date of the credit event. The difference between the value of the obligation or cash received and the notional amount paid will be recorded as a realized gain (loss). The maximum potential amount of undiscounted future payments the Fund could be required to make as the seller of protection under a credit default swap contract is equal to the notional amount of the reference obligation. These potential amounts may be partially offset by any recovery values of the respective reference obligations or upfront receipts upon entering into the agreement. The notional amounts and market values of all credit default swap contracts in which the Fund is the seller of protection, if any, are disclosed in the Credit Default Swap Contracts Outstanding schedule following the Portfolio of Investments.
As a protection seller, the Fund bears the risk of loss from the credit events specified in the contract with the counterparty. For credit default swap contracts on credit indices, quoted market prices and resulting market values serve as an indicator of the current status of the payment/performance risk. Increasing market values, in absolute terms when compared to the notional amount of the swap, represent a deterioration of the reference entity’s credit soundness and a greater likelihood or risk of default or other credit event occurring as defined under the terms of the contract.
Any upfront payment or receipt by the Fund upon entering into a credit default swap contract is recorded as an asset or liability, respectively, and amortized daily as a component of realized gain (loss) in the Statement of Operations. Credit default swap contracts are valued daily, and the change in value is recorded as unrealized appreciation (depreciation) until the termination of the swap, at which time a realized gain (loss) is recorded.
Credit default swap contracts can involve greater risks than if a fund had invested in the reference obligation directly since, in addition to general market risks, credit default swaps are subject to other risks including counterparty credit risk, leverage risk, hedging risk, correlation risk and liquidity risk.
Interest rate and inflation rate swap contracts
The Fund entered into interest rate swap transactions or inflation rate swap contracts (together, rate swaps) to manage interest rate and market risk exposure to produce incremental earnings. These instruments may be used for other purposes in future periods. A rate swap is an agreement between two parties where there are two flows and payments are made between the two counterparties and the payments are dependent upon changes in an interest rate, inflation rate or inflation index calculated on a notional amount. Certain rate swaps are considered forward-starting, whereby the accrual for the exchange of cash flows does not begin until a specified date in the future. The net cash flow for a standard rate swap is generally the difference between a floating market interest rate or floating rate linked to an inflation index versus a fixed interest rate as applied to the notional amount.
Rate swaps are valued daily and unrealized appreciation (depreciation) is recorded. Certain rate swaps may accrue periodic interest on a daily basis as a component of unrealized appreciation (depreciation); the Fund will realize a gain or loss upon the payment or receipt of accrued interest. The Fund will realize a gain or a loss when the rate swap is terminated.
Columbia Mortgage Opportunities Fund  | 2025
37

Notes to Financial Statements (continued)
May 31, 2025
Effects of derivative transactions in the financial statements
The following tables are intended to provide additional information about the effect of derivatives on the financial statements of the Fund, including: the fair value of derivatives by risk category and the location of those fair values in the Statement of Assets and Liabilities; and the impact of derivative transactions over the period in the Statement of Operations, including realized and unrealized gains (losses). The derivative instrument schedules following the Portfolio of Investments present additional information regarding derivative instruments outstanding at the end of the period, if any.
The following table is a summary of the fair value of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) at May 31, 2025: 
 
Asset derivatives
 
Risk exposure
category
Statement
of assets and liabilities
location
Fair value ($)
Credit risk
Component of total distributable earnings (loss) — unrealized appreciation on swap contracts
3,192,345
*
Credit risk
Upfront payments on swap contracts
20,532,759
Interest rate risk
Component of total distributable earnings (loss) — unrealized appreciation on futures contracts
5,571,891
*
Interest rate risk
Investments, at value — Option contracts purchased
22,753,501
Total
 
52,050,496
 
 
Liability derivatives
 
Risk exposure
category
Statement
of assets and liabilities
location
Fair value ($)
Credit risk
Component of total distributable earnings (loss) — unrealized depreciation on swap contracts
12,627,101
*
Credit risk
Upfront receipts on swap contracts
26,895,205
Interest rate risk
Component of total distributable earnings (loss) — unrealized depreciation on futures contracts
27,504,048
*
Interest rate risk
Option contracts written, at value
978,179
Total
 
68,004,533
 
*
Includes cumulative appreciation (depreciation) as reported in the tables following the Portfolio of Investments. Only the current day’s variation margin for futures and centrally cleared swaps, if any, is reported in receivables or payables in the Statement of Assets and Liabilities.
The following table indicates the effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) in the Statement of Operations for the year ended May 31, 2025: 
Amount of realized gain (loss) on derivatives recognized in income
Risk exposure category
Futures
contracts
($)
Option
contracts
purchased
($)
Option
contracts
written
($)
Swap
contracts
($)
Total
($)
Credit risk
107,285
107,285
Interest rate risk
45,484,220
(15,747,365
)
3,417,000
16,348,894
49,502,749
Total
45,484,220
(15,747,365
)
3,417,000
16,456,179
49,610,034
 
Change in unrealized appreciation (depreciation) on derivatives recognized in income
Risk exposure category
Futures
contracts
($)
Option
contracts
purchased
($)
Option
contracts
written
($)
Swap
contracts
($)
Total
($)
Credit risk
1,404,566
1,404,566
Interest rate risk
(29,802,888
)
13,474,181
4,053,399
(12,275,308
)
Total
(29,802,888
)
13,474,181
4,053,399
1,404,566
(10,870,742
)
38
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
The following table is a summary of the average daily outstanding volume by derivative instrument for the year ended May 31, 2025: 
Derivative instrument
Average notional
amounts ($)
Futures contracts — long
1,779,143,097
Futures contracts — short
3,563,783,044
Credit default swap contracts — buy protection
156,686,813
Credit default swap contracts — sell protection
96,198,711
 
Derivative instrument
Average
value ($)
Option contracts purchased
31,017,958
Option contracts written
(208,872
)
 
Derivative instrument
Average unrealized
appreciation ($)
Average unrealized
depreciation ($)
Interest rate swap contracts
3,479,514
(75,381
)
Asset- and mortgage-backed securities
The Fund may invest in asset-backed and mortgage-backed securities. The maturity dates shown represent the original maturity of the underlying obligation. Actual maturity may vary based upon prepayment activity on these obligations. All, or a portion, of the obligation may be prepaid at any time because the underlying asset may be prepaid. As a result, decreasing market interest rates could result in an increased level of prepayment. An increased prepayment rate will have the effect of shortening the maturity of the security. Unless otherwise noted, the coupon rates presented are fixed rates.
Delayed delivery securities
The Fund may trade securities on other than normal settlement terms, including securities purchased or sold on a “when-issued” or "forward commitment" basis. This may increase risk to the Fund since the other party to the transaction may fail to deliver, which could cause the Fund to subsequently invest at less advantageous prices. The Fund designates cash or liquid securities in an amount equal to the delayed delivery commitment.
To be announced securities
The Fund may trade securities on a To Be Announced (TBA) basis. As with other delayed-delivery transactions, a seller agrees to issue a TBA security at a future date. However, the seller does not specify the particular securities to be delivered. Instead, the Fund agrees to accept any security that meets specified terms.
In some cases, Master Securities Forward Transaction Agreements (MSFTAs) may be used to govern transactions of certain forward-settling agency mortgage-backed securities, such as delayed-delivery and TBAs, between the Fund and counterparty. The MSFTA maintains provisions for, among other things, initiation and confirmation, payment and transfer, events of default, termination, and maintenance of collateral relating to such transactions.
Mortgage dollar roll transactions
The Fund may enter into mortgage “dollar rolls” in which the Fund sells securities for delivery in the current month and simultaneously contracts with the same counterparty to repurchase similar but not identical securities (same type, coupon and maturity) on a specified future date. These transactions may increase the Fund’s portfolio turnover rate. During the roll period, the Fund loses the right to receive principal and interest paid on the securities sold. However, the Fund may benefit because it receives negotiated amounts in the form of reductions of the purchase price for the future purchase plus the interest earned on the cash proceeds of the securities sold until the settlement date of the forward purchase. The Fund records the incremental difference between the forward purchase and sale of each forward roll as a realized gain or loss. Unless any realized gains exceed the income, capital appreciation, and gain or loss due to mortgage prepayments that would have been realized on the securities sold as part of the mortgage dollar roll, the use of this technique may diminish the investment performance of the Fund compared to what the performance would have been without the use of mortgage
Columbia Mortgage Opportunities Fund  | 2025
39

Notes to Financial Statements (continued)
May 31, 2025
dollar rolls. Mortgage dollar rolls involve the risk that the market value of the securities the Fund is obligated to repurchase may decline below the repurchase price, or that the counterparty may default on its obligations. All cash proceeds will be invested in instruments that are permissible investments for the Fund. The Fund identifies cash or liquid securities in an amount equal to the forward purchase price. The Fund does not currently enter into mortgage dollar rolls that are accounted for as financing transactions.
Interest only and principal only securities 
The Fund may invest in Interest Only (IO) or Principal Only (PO) securities. IOs are stripped securities entitled to receive all of the security’s interest, but none of its principal. IOs are particularly sensitive to changes in interest rates and therefore subject to greater fluctuations in price than typical interest bearing debt securities. IOs are also subject to credit risk because the Fund may not receive all or part of the interest payments if the issuer, obligor, guarantor or counterparty defaults on its obligation. Payments received for IOs are included in interest income in the Statement of Operations. Because no principal will be received at the maturity of an IO, adjustments are made to the cost of the security on a monthly basis until maturity. These adjustments are included in interest income in the Statement of Operations. POs are stripped securities entitled to receive the principal from the underlying obligation, but not the interest. POs are particularly sensitive to changes in interest rates and therefore are subject to fluctuations in price. POs are also subject to credit risk because the Fund may not receive all or part of its principal if the issuer, obligor, guarantor or counterparty defaults on its obligation. The Fund may also invest in IO or PO stripped mortgage-backed securities. Payments received for POs are treated as reductions to the cost and par value of the securities.
Offsetting of assets and liabilities
The following table presents the Fund’s gross and net amount of assets and liabilities available for offset under netting arrangements as well as any related collateral received or pledged by the Fund as of May 31, 2025: 
 
Citi ($)(a)
Citi ($)(a)
Goldman
Sachs
International ($)
Morgan
Stanley ($)
Total ($)
Assets
Call option contracts purchased
9,411,727
-
175,750
4,415,200
14,002,677
Put option contracts purchased
3,261,758
-
1,454,276
4,034,790
8,750,824
OTC credit default swap contracts (b)
-
20,151,127
3,420,559
153,418
23,725,104
Total assets
12,673,485
20,151,127
5,050,585
8,603,408
46,478,605
Liabilities
Call option contracts written
978,179
-
-
-
978,179
OTC credit default swap contracts (b)
-
14,355,167
16,555,307
8,611,832
39,522,306
Total liabilities
978,179
14,355,167
16,555,307
8,611,832
40,500,485
Total financial and derivative net assets
11,695,306
5,795,960
(11,504,722
)
(8,424
)
5,978,120
Total collateral received (pledged) (c)
11,695,306
5,538,000
(11,090,000
)
(8,424
)
6,134,882
Net amount (d)
-
257,960
(414,722
)
-
(156,762
)
 
(a)
Exposure can only be netted across transactions governed under the same master agreement with the same legal entity.
(b)
Over-the-Counter (OTC) swap contracts are presented at market value plus periodic payments receivable (payable), which is comprised of unrealized appreciation, unrealized depreciation, upfront payments and upfront receipts.
(c)
In some instances, the actual collateral received and/or pledged may be more than the amount shown due to overcollateralization.
(d)
Represents the net amount due from/(to) counterparties in the event of default.
Security transactions
Security transactions are accounted for on the trade date. Cost is determined and gains (losses) are based upon the specific identification method for both financial statement and federal income tax purposes.
40
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
Income recognition
Interest income is recorded on an accrual basis. Market premiums and discounts, including original issue discounts, are amortized and accreted, respectively, over the expected life of the security on all debt securities, unless otherwise noted. The Fund classifies gains and losses realized on prepayments received on mortgage-backed securities as adjustments to interest income.
The Fund may place a debt security on non-accrual status and reduce related interest income when it becomes probable that the interest will not be collected and the amount of uncollectible interest can be reasonably estimated. The Fund may also adjust accrual rates when it becomes probable the full interest will not be collected and a partial payment will be received. A defaulted debt security is removed from non-accrual status when the issuer resumes interest payments or when collectability of interest is reasonably assured.
Dividend income is recorded on the ex-dividend date.
Expenses
General expenses of the Trust are allocated to the Fund and other funds of the Trust based upon relative net assets or other expense allocation methodologies determined by the nature of the expense. Expenses directly attributable to the Fund are charged to the Fund. Expenses directly attributable to a specific class of shares are charged to that share class.
Determination of class net asset value
All income, expenses (other than class-specific expenses, which are charged to that share class, as shown in the Statement of Operations) and realized and unrealized gains (losses) are allocated to each class of the Fund on a daily basis, based on the relative net assets of each class, for purposes of determining the net asset value of each class.
Federal income tax status
The Fund intends to qualify each year as a regulated investment company under Subchapter M of the Internal Revenue Code, as amended, and will distribute substantially all of its investment company taxable income and net capital gain, if any, for its tax year, and as such will not be subject to federal income taxes. In addition, the Fund intends to distribute in each calendar year substantially all of its ordinary income, capital gain net income and certain other amounts, if any, such that the Fund should not be subject to federal excise tax. Therefore, no federal income or excise tax provision is recorded.
Distributions to shareholders
Distributions from net investment income, if any, are declared and paid monthly. Net realized capital gains, if any, are distributed at least annually. Income distributions and capital gain distributions are determined in accordance with federal income tax regulations, which may differ from GAAP.
Guarantees and indemnifications
Under the Trust’s organizational documents and, in some cases, by contract, its officers and trustees are indemnified against certain liabilities arising out of the performance of their duties to the Trust or its funds. In addition, certain of the Fund’s contracts with its service providers contain general indemnification clauses. The Fund’s maximum exposure under these arrangements is unknown since the amount of any future claims that may be made against the Fund cannot be determined, and the Fund has no historical basis for predicting the likelihood of any such claims.
Recent accounting pronouncements and regulatory updates
Accounting Standards Update 2023-09 Income Taxes (Topic 740)
In December 2023, the FASB issued Accounting Standards Update No. 2023-09 Income Taxes (Topic 740) Improvements to Income Tax Disclosures. The amendments were issued to enhance the transparency and decision usefulness of income tax disclosures primarily related to rate reconciliation and income taxes paid information. The amendments are effective for annual periods beginning after December 15, 2024, with early adoption permitted. Management expects that the adoption of the amendments will not have a material impact on its financial statements.
Columbia Mortgage Opportunities Fund  | 2025
41

Notes to Financial Statements (continued)
May 31, 2025
Note 3. Fees and other transactions with affiliates
Management services fees
The Fund has entered into a Management Agreement with Columbia Management Investment Advisers, LLC (the Investment Manager), a wholly-owned subsidiary of Ameriprise Financial, Inc. (Ameriprise Financial). Under the Management Agreement, the Investment Manager provides the Fund with investment research and advice, as well as administrative and accounting services. The management services fee is an annual fee that is equal to a percentage of the Fund’s daily net assets that declines from 0.65% to 0.535% as the Fund’s net assets increase. The effective management services fee rate for the year ended May 31, 2025 was 0.636% of the Fund’s average daily net assets.
Compensation of Board members
Members of the Board of Trustees who are not officers or employees of the Investment Manager or Ameriprise Financial are compensated for their services to the Fund as disclosed in the Statement of Operations. Under a Deferred Compensation Plan (the Deferred Plan), these members of the Board of Trustees may elect to defer payment of up to 100% of their compensation. Deferred amounts are treated as though equivalent dollar amounts had been invested in shares of certain funds managed by the Investment Manager. The Fund’s liability for these amounts is adjusted for market value changes and remains in the Fund until distributed in accordance with the Deferred Plan. All amounts payable under the Deferred Plan constitute a general unsecured obligation of the Fund. The expense for the Deferred Plan, which includes Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations, is included in "Deferred compensation of board members" in the Statement of Operations.
Compensation of Chief Compliance Officer
The Board of Trustees has appointed a Chief Compliance Officer for the Fund in accordance with federal securities regulations. As disclosed in the Statement of Operations, a portion of the Chief Compliance Officer’s total compensation is allocated to the Fund, along with other allocations to affiliated registered investment companies managed by the Investment Manager and its affiliates, based on relative net assets.
Transfer agency fees
Under a Transfer and Dividend Disbursing Agent Agreement, Columbia Management Investment Services Corp. (the Transfer Agent), an affiliate of the Investment Manager and a wholly-owned subsidiary of Ameriprise Financial, is responsible for providing transfer agency services to the Fund. The Transfer Agent has contracted with SS&C GIDS, Inc. (SS&C GIDS) to serve as sub-transfer agent. The Transfer Agent pays the fees of SS&C GIDS for services as sub-transfer agent and SS&C GIDS is not entitled to reimbursement for such fees from the Fund (with the exception of out-of-pocket fees).
The Fund pays the Transfer Agent a monthly transfer agency fee based on the number or the average value of accounts, depending on the type of account. In addition, the Fund pays the Transfer Agent a fee for shareholder services based on the number of accounts or on a percentage of the average aggregate value of the Fund’s shares maintained in omnibus accounts up to the lesser of the amount charged by the financial intermediary or a cap established by the Board of Trustees from time to time.
The Transfer Agent also receives compensation from the Fund for various shareholder services and reimbursements for certain out-of-pocket fees. Total transfer agency fees for Institutional 2 Class and Institutional 3 Class shares are subject to an annual limitation of not more than 0.07% and 0.02%, respectively, of the average daily net assets attributable to each share class.
42
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
For the year ended May 31, 2025, the Fund’s effective transfer agency fee rates as a percentage of average daily net assets of each class were as follows: 
 
Effective rate (%)
Class A
0.10
Advisor Class
0.05
(a)
Class C
0.10
Institutional Class
0.10
Institutional 2 Class
0.05
Institutional 3 Class
0.01
Class S
0.10
(b)
 
(a)
Unannualized.
(b)
Annualized.
An annual minimum account balance fee of $20 may apply to certain accounts with a value below the applicable share class’s initial minimum investment requirements to reduce the impact of small accounts on transfer agency fees. These minimum account balance fees are remitted to the Fund and recorded as part of expense reductions in the Statement of Operations. For the year ended May 31, 2025, no minimum account balance fees were charged by the Fund.
Distribution and service fees
The Fund has entered into an agreement with Columbia Management Investment Distributors, Inc. (the Distributor), an affiliate of the Investment Manager and a wholly-owned subsidiary of Ameriprise Financial, for distribution and shareholder services. Under a Plan and Agreement of Distribution, the Fund pays a fee at the maximum annual rates of up to 0.25% and 1.00% of the Fund’s average daily net assets attributable to Class A and Class C shares, respectively. For Class C shares, of the 1.00% fee, up to 0.75% can be reimbursed for distribution expenses and up to an additional 0.25% can be reimbursed for shareholder servicing expenses.
The amount of distribution and shareholder services expenses incurred by the Distributor and not yet reimbursed (unreimbursed expense) was approximately $293,000 for Class C shares. This amount is based on the most recent information available as of March 31, 2025, and may be recovered from future payments under the distribution plan or contingent deferred sales charges (CDSCs). To the extent the unreimbursed expense has been fully recovered, the distribution and/or shareholder services fee is reduced.
Sales charges (unaudited)
Sales charges, including front-end charges and CDSCs, received by the Distributor for distributing Fund shares for the year ended May 31, 2025, if any, are listed below: 
 
Front End (%)
CDSC (%)
Amount ($)
Class A
3.00
0.50 - 1.00
(a)
96,102
Class C
1.00
(b)
2,670
 
(a)
This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.
(b)
This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.
The Fund’s other share classes are not subject to sales charges.
Columbia Mortgage Opportunities Fund  | 2025
43

Notes to Financial Statements (continued)
May 31, 2025
Expenses waived/reimbursed by the Investment Manager and its affiliates
The Investment Manager and certain of its affiliates have contractually agreed to waive fees and/or reimburse expenses (excluding certain fees and expenses described below) for the period(s) disclosed below, unless sooner terminated at the sole discretion of the Board of Trustees, so that the Fund’s net operating expenses, after giving effect to fees waived/expenses reimbursed and any balance credits and/or overdraft charges from the Fund’s custodian, do not exceed the following annual rate(s) as a percentage of the classes’ average daily net assets: 
 
October 1, 2024
through
September 30, 2025 (%)
Prior to
October 1, 2024 (%)
Class A
0.99
0.99
Class C
1.74
1.74
Institutional Class
0.74
0.74
Institutional 2 Class
0.69
0.69
Institutional 3 Class
0.65
0.65
Class S
0.74
Under the agreement governing these fee waivers and/or expense reimbursement arrangements, the following fees and expenses are excluded from the waiver/reimbursement commitment, and therefore will be paid by the Fund, if applicable: taxes (including foreign transaction taxes), expenses associated with investments in affiliated and non-affiliated pooled investment vehicles (including mutual funds and exchange-traded funds), transaction costs and brokerage commissions, costs related to any securities lending program, dividend expenses associated with securities sold short, inverse floater program fees and expenses, transaction charges and interest on borrowed money, interest, costs associated with shareholder meetings, infrequent and/or unusual expenses and any other expenses the exclusion of which is specifically approved by the Board of Trustees. This agreement may be modified or amended only with approval from the Investment Manager, certain of its affiliates and the Fund. Any fees waived and/or expenses reimbursed under the expense reimbursement arrangements described above are not recoverable by the Investment Manager or its affiliates in future periods.
Note 4. Federal tax information
The timing and character of income and capital gain distributions are determined in accordance with income tax regulations, which may differ from GAAP because of temporary or permanent book to tax differences.
At May 31, 2025, these differences were primarily due to differing treatment for derivative investments, tax straddles, principal and/or interest from fixed income securities, defaulted securities/troubled debt, capital loss carryforwards, trustees’ deferred compensation and swap investments.  To the extent these differences were permanent, reclassifications were made among the components of the Fund’s net assets. Temporary differences do not require reclassifications.
The following reclassifications were made: 
Undistributed net
investment
income ($)
Accumulated
net realized
(loss) ($)
Paid in
capital ($)
1,581,553
(1,581,553
)
Net investment income (loss) and net realized gains (losses), as disclosed in the Statement of Operations, and net assets were not affected by this reclassification.
The tax character of distributions paid during the years indicated was as follows: 
Year Ended May 31, 2025
Year Ended May 31, 2024
Ordinary
income ($)
Long-term
capital gains ($)
Total ($)
Ordinary
income ($)
Long-term
capital gains ($)
Total ($)
127,536,434
127,536,434
156,002,110
156,002,110
44
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
Short-term capital gain distributions, if any, are considered ordinary income distributions for tax purposes.
At May 31, 2025, the components of distributable earnings on a tax basis were as follows: 
Undistributed
ordinary income ($)
Undistributed
long-term
capital gains ($)
Capital loss
carryforwards ($)
Net unrealized
(depreciation) ($)
5,523,768
(728,512,281
)
(203,936,197
)
At May 31, 2025, the cost of all investments for federal income tax purposes along with the aggregate gross unrealized appreciation and depreciation based on that cost was: 
Federal
tax cost ($)
Gross unrealized
appreciation ($)
Gross unrealized
(depreciation) ($)
Net unrealized
(depreciation) ($)
4,660,886,385
97,864,601
(301,800,798
)
(203,936,197
)
Tax cost of investments and unrealized appreciation/(depreciation) may also include timing differences that do not constitute adjustments to tax basis.
The following capital loss carryforwards, determined at May 31, 2025, may be available to reduce future net realized gains on investments, if any, to the extent permitted by the Internal Revenue Code. In addition, for the year ended May 31, 2025, capital loss carryforwards utilized, if any, were as follows: 
No expiration
short-term ($)
No expiration
long-term ($)
Total ($)
Utilized ($)
(415,274,387
)
(313,237,894
)
(728,512,281
)
89,255,937
Management of the Fund has concluded that there are no significant uncertain tax positions in the Fund that would require recognition in the financial statements. However, management’s conclusion may be subject to review and adjustment at a later date based on factors including, but not limited to, new tax laws, regulations, and administrative interpretations (including relevant court decisions). Generally, the Fund’s federal tax returns for the prior three fiscal years remain subject to examination by the Internal Revenue Service.
Note 5. Portfolio information
The cost of purchases and proceeds from sales of securities, excluding short-term investments and derivatives, if any, aggregated to $30,493,077,937 and $30,596,769,815, respectively, for the year ended May 31, 2025, of which $29,717,387,306 and $29,585,068,270, respectively, were U.S. government securities. The amount of purchase and sale activity impacts the portfolio turnover rate reported in the Financial Highlights.
Note 6. Affiliated money market fund
The Fund invests in Columbia Short-Term Cash Fund, an affiliated money market fund established for the exclusive use by the Fund and other affiliated funds (the Affiliated MMF). The income earned by the Fund from such investments is included as Dividends - affiliated issuers in the Statement of Operations. As an investing fund, the Fund indirectly bears its proportionate share of the expenses of the Affiliated MMF. The Affiliated MMF prices its shares with a floating net asset value. The Securities and Exchange Commission has adopted amendments to money market fund rules requiring institutional prime money market funds like the Affiliated MMF to be subject to a discretionary liquidity fee of up to 2% if the imposition of such a fee is determined to be in the best interest of the Affiliated MMF and to a mandatory liquidity fee if daily net redemptions exceed 5% of net assets.
Columbia Mortgage Opportunities Fund  | 2025
45

Notes to Financial Statements (continued)
May 31, 2025
Note 7. Interfund lending
Pursuant to an exemptive order granted by the Securities and Exchange Commission, the Fund participates in a program (the Interfund Program) allowing each participating Columbia Fund (each, a Participating Fund) to lend money directly to and, except for closed-end funds and money market funds, borrow money directly from other Participating Funds for temporary purposes. The amounts eligible for borrowing and lending under the Interfund Program are subject to certain restrictions.
Interfund loans are subject to the risk that the borrowing fund could be unable to repay the loan when due, and a delay in repayment to the lending fund could result in lost opportunities and/or additional lending costs. The exemptive order is subject to conditions intended to mitigate conflicts of interest arising from the Investment Manager’s relationship with each Participating Fund.
The Fund’s activity in the Interfund Program during the year ended May 31, 2025 was as follows: 
Borrower or lender
Average loan
balance ($)
Weighted average
interest rate (%)
Number of days
with outstanding loans
Lender
1,275,000
5.27
8
Interest income earned by the Fund is recorded as Interfund lending in the Statement of Operations. The Fund had no outstanding interfund loans at May 31, 2025.
Note 8. Line of credit
The Fund has access to a revolving credit facility with a syndicate of banks led by JPMorgan Chase Bank, N.A., Citibank, N.A. and Wells Fargo Bank, N.A. whereby the Fund may borrow for the temporary funding of shareholder redemptions or for other temporary or emergency purposes. Pursuant to an October 24, 2024 amendment and restatement, the credit facility, which is an agreement between the Fund and certain other funds managed by the Investment Manager or an affiliated investment manager, severally and not jointly, permits aggregate borrowings up to $900 million. Interest is currently charged to each participating fund based on its borrowings at a rate equal to the higher of (i) the federal funds effective rate, (ii) the secured overnight financing rate plus 0.10% and (iii) the overnight bank funding rate, plus 1.00% in each case. Each borrowing under the credit facility matures no later than 60 days after the date of borrowing. The Fund also pays a commitment fee equal to its pro rata share of the unused amount of the credit facility at a rate of 0.15% per annum. The commitment fee is included in other expenses in the Statement of Operations. This agreement expires annually in October unless extended or renewed. Prior to the October 24, 2024 amendment and restatement, the Fund had access to a revolving credit facility with a syndicate of banks led by JPMorgan Chase Bank, N.A., Citibank, N.A. and Wells Fargo Bank, N.A. which permitted collective borrowings up to $900 million. Interest was charged to each participating fund based on its borrowings at a rate equal to the higher of (i) the federal funds effective rate, (ii) the secured overnight financing rate plus 0.10% and (iii) the overnight bank funding rate, plus 1.00% in each case.
The Fund had no borrowings during the year ended May 31, 2025.
Note 9. Significant risks
Credit risk
Credit risk is the risk that the value of debt instruments in the Fund’s portfolio may decline because the issuer defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Credit rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Lower-rated or unrated debt instruments held by the Fund may present increased credit risk as compared to higher-rated debt instruments.
Derivatives risk
Losses involving derivative instruments may be substantial, because a relatively small movement in the underlying reference (which is generally the price, rate or other economic indicator associated with a security(ies), commodity, currency, index or other instrument or asset) may result in a substantial loss for the Fund. In addition to the potential for increased losses, the
46
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
use of derivative instruments may lead to increased volatility within the Fund. Derivatives will typically increase the Fund’s exposure to principal risks to which it is otherwise exposed, and may expose the Fund to additional risks, including correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk and pricing risk.
High-yield investments risk
Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called "high-yield" or "junk" bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.
Interest rate risk
Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. For example, a three-year duration means a bond is expected to decrease in value by 3% if interest rates rise 1% and increase in value by 3% if interest rates fall 1%. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. The Fund is subject to the risk that the income generated by its investments may not keep pace with inflation. Actions by governments and central banking authorities can result in increases or decreases in interest rates. Higher periods of inflation could lead such authorities to raise interest rates.  Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund’s performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease.  Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.
Leverage risk
Leverage occurs when the Fund increases its assets available for investment using borrowings, derivatives, or similar instruments or techniques. The use of leverage may produce volatility and may exaggerate changes in the Fund’s net asset value and in the return on the Fund’s portfolio, which may increase the risk that the Fund will lose more than it has invested. If the Fund uses leverage, through the purchase of particular instruments such as derivatives, the Fund may experience capital losses that exceed the net assets of the Fund. Leverage can create an interest expense that may lower the Fund’s overall returns. Leverage presents the opportunity for increased net income and capital gains, but may also exaggerate the Fund’s volatility and risk of loss. There can be no guarantee that a leveraging strategy will be successful.
Liquidity risk
Liquidity risk is the risk associated with any event, circumstance, or characteristic of an investment or market that negatively impacts the Fund’s ability to sell, or realize the proceeds from the sale of, an investment at a desirable time or price. Liquidity risk may arise because of, for example, a lack of marketability of the investment, which means that when seeking to sell its portfolio investments, the Fund could find that selling is more difficult than anticipated, especially during times of high market volatility. Market participants attempting to sell the same or a similar instrument at the same time as the Fund could exacerbate the Fund’s exposure to liquidity risk. The Fund may have to accept a lower selling price for the holding, sell other liquid or more liquid investments that it might otherwise prefer to hold (thereby increasing the proportion of the Fund’s investments in less liquid or illiquid securities), or forego another more appealing investment opportunity. The liquidity of Fund investments may change significantly over time and certain investments that were liquid when purchased by the Fund may later become illiquid, particularly in times of overall economic distress. Changing regulatory, market or other conditions or environments (for example, the interest rate or credit environments) may also adversely affect the liquidity and the price of the Fund’s investments. Judgment plays a larger role in valuing illiquid or less liquid investments as compared to valuing liquid or more liquid investments. Price volatility may be higher for illiquid or less liquid investments as a result of, for example, the relatively less frequent pricing of such securities (as compared to liquid or more liquid investments). Generally,
Columbia Mortgage Opportunities Fund  | 2025
47

Notes to Financial Statements (continued)
May 31, 2025
the less liquid the market at the time the Fund sells a portfolio investment, the greater the risk of loss or decline of value to the Fund. Overall market liquidity and other factors can lead to an increase in redemptions, which may negatively impact Fund performance and NAV, including, for example, if the Fund is forced to sell investments in a down market. 
Market risk
The Fund may incur losses due to declines in the value of one or more securities in which it invests. These declines may be due to factors affecting a particular issuer, or the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s) more generally. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively affect many issuers, which could adversely affect the Fund’s ability to price or value hard-to-value assets in thinly traded and closed markets and could cause significant redemptions and operational challenges. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies worldwide. As a result, local, regional or global events such as terrorism, war, other conflicts, natural disasters, disease/virus outbreaks and epidemics or other public health issues, recessions, depressions or other events – or the potential for such events – could have a significant negative impact on global economic and market conditions.
Mortgage- and other asset-backed securities risk
The value of any mortgage-backed and other asset-backed securities including collateralized debt obligations, if any, held by the Fund may be affected by, among other things, changes or perceived changes in: interest rates; factors concerning the interests in and structure of the issuer or the originator of the mortgages or other assets; the creditworthiness of the entities that provide any supporting letters of credit, surety bonds or other credit enhancements; or the market’s assessment of the quality of underlying assets. Payment of principal and interest on some mortgage-backed securities (but not the market value of the securities themselves) may be guaranteed by the full faith and credit of a particular U.S. Government agency, authority, enterprise or instrumentality, and some, but not all, are also insured or guaranteed by the U.S. Government. Mortgage-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) may entail greater risk than obligations guaranteed by the U.S. Government. Mortgage- and other asset-backed securities are subject to liquidity risk and prepayment risk. A decline or flattening of housing values may cause delinquencies in mortgages (especially sub-prime or non-prime mortgages) underlying mortgage-backed securities and thereby adversely affect the ability of the mortgage-backed securities issuer to make principal and/or interest payments to mortgage-backed securities holders, including the Fund. Rising or high interest rates tend to extend the duration of mortgage- and other asset-backed securities, making their prices more volatile and more sensitive to changes in interest rates.
Shareholder concentration risk
At May 31, 2025, one unaffiliated shareholder of record owned 31.0% of the outstanding shares of the Fund in one or more accounts. The Fund has no knowledge about whether any portion of those shares was owned beneficially. Fund shares sold to or redeemed by concentrated accounts may have a significant effect on the operations of the Fund. In the case of a large redemption, the Fund may be forced to sell investments at inopportune times, including its liquid positions, which may result in Fund losses and the Fund holding a higher percentage of less liquid positions. Large redemptions could result in decreased economies of scale and increased operating expenses for non-redeeming Fund shareholders.
Note 10. Subsequent events
Management has evaluated the events and transactions that have occurred through the date the financial statements were issued and noted no items requiring adjustment of the financial statements or additional disclosure.
Note 11. Information regarding pending and settled legal proceedings
Ameriprise Financial and certain of its affiliates are involved, in the normal course of business, in legal proceedings that include regulatory inquiries, arbitration and litigation (including class actions) concerning matters arising in connection with the conduct of their activities as part of a diversified financial services firm. Ameriprise Financial believes that the Fund is
48
Columbia Mortgage Opportunities Fund  | 2025

Notes to Financial Statements (continued)
May 31, 2025
not currently the subject of, and that neither Ameriprise Financial nor any of its affiliates are the subject of, any pending legal, arbitration or regulatory proceedings that are likely to have a material adverse effect on the Fund or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Fund. Ameriprise Financial is required to make quarterly (10-Q), annual (10-K) and, as necessary, 8-K filings with the Securities and Exchange Commission (SEC) on legal and regulatory matters that relate to Ameriprise Financial and its affiliates. Copies of these filings may be obtained by accessing the SEC website at www.sec.gov.
There can be no assurance that these matters, or the adverse publicity associated with them, will not result in increased Fund redemptions, reduced sale of Fund shares or other adverse consequences to the Fund. Further, although we believe proceedings are not likely to have a material adverse effect on the Fund or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Fund, these proceedings are subject to uncertainties and, as such, it is inherently difficult to determine whether any loss is probable or even reasonably possible, or to reasonably estimate the amount of any loss that may result from such matters. An adverse outcome in one or more of these proceedings could result in adverse judgments, settlements, fines, penalties or other relief, and may lead to further claims, examinations, adverse publicity or reputational damage, each of which could have a material adverse effect on the consolidated financial condition or results of operations or financial condition of Ameriprise Financial or one or more of its affiliates that provide services to the Fund.
Columbia Mortgage Opportunities Fund  | 2025
49

Report of Independent Registered Public Accounting Firm
To the Board of Trustees of Columbia Funds Series Trust II and Shareholders of Columbia Mortgage Opportunities Fund
Opinion on the Financial Statements
We have audited the accompanying statement of assets and liabilities, including the portfolio of investments, of Columbia Mortgage Opportunities Fund (one of the funds constituting Columbia Funds Series Trust II, referred to hereafter as the "Fund") as of May 31, 2025, the related statement of operations for the year ended May 31, 2025, the statement of changes in net assets for each of the two years in the period ended May 31, 2025, including the related notes, and the financial highlights for each of the periods indicated therein (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund as of May 31, 2025, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period ended May 31, 2025 and the financial highlights for each of the periods indicated therein in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits of these financial statements in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our procedures included confirmation of securities owned as of May 31, 2025 by correspondence with the custodian, transfer agent and brokers; when replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.
/s/PricewaterhouseCoopers LLP
Minneapolis, Minnesota
July 23, 2025
We have served as the auditor of one or more investment companies within the Columbia Funds Complex since 1977.
50
Columbia Mortgage Opportunities Fund  | 2025

[THIS PAGE INTENTIONALLY LEFT BLANK]

Columbia Mortgage Opportunities Fund
P.O. Box 219104
Kansas City, MO 64121-9104
  
Please read and consider the investment objectives, risks, charges and expenses for any fund carefully before investing. For a prospectus and summary prospectus, which contains this and other important information about the Fund, go to
columbiathreadneedleus.com/investor/. The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC.
Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
columbiathreadneedleus.com/investor/
ANN251_05_R01_(07/25)



Item 8. Changes in and Disagreements with Accountants for Open-End Management Investment Companies.

Not applicable.


Item 9. Proxy Disclosures for Open-End Management Investment Companies.

Not applicable.


Item 10. Remuneration Paid to Directors, Officers, and Others of Open-End Management Investment Companies.

The fees and expenses of the independent trustees are included in "Compensation of board members" and "Deferred compensation of board members" on each Fund's Statement of Operations as part of the Registrant's financial statements filed under Item 7 of this Form N-CSR.  Additionally, the compensation paid by the Trust to the Chief Compliance Officer is included in "Compensation of chief compliance officer" on each Fund's Statement of Operations as part of the Registrant's financial statements filed under Item 7 of this Form N-CSR.


Item 11. Statement Regarding Basis for Approval of Investment Advisory Contract.

Not applicable.


Item 12. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

Not applicable.


Item 13. Portfolio Managers of Closed-End Management Investment Companies.

Not applicable.


Item 14. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

Not applicable.


Item 15. Submission of Matters to a Vote of Security Holders.

There were no material changes to the procedures by which shareholders may recommend nominees to the registrant’s board of directors implemented since the registrant last provided disclosure as to such procedures in response to the requirements of Item 407(c)(2)(iv) of Regulation S-K or Item 15 of Form N-CSR.


Item 16. Controls and Procedures.

(a) The registrant’s principal executive officer and principal financial officer, based on their evaluation of the registrant’s disclosure controls and procedures as of a date within 90 days of the filing of this report, have concluded that such controls and procedures are adequately designed to ensure that information required to be disclosed by the registrant in Form N-CSR is accumulated and communicated to the registrant’s management, including the principal executive officer and principal financial officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

(b) There was no change in the registrant’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.


Item 17. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies.

Not applicable.


Item 18. Recovery of Erroneously Awarded Compensation.

Not applicable.


Item 19. Exhibits.

(a)(1) Code of ethics required to be disclosed under Item 2 of Form N-CSR attached hereto as Exhibit 99.CODE ETH.

(a)(2) Certifications pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) attached hereto as Exhibit 99.CERT.

(b) Certification pursuant to Rule 30a-2(b) under the Investment Company Act of 1940 (17 CFR 270.30a-2(b)) attached hereto as Exhibit 99.906CERT.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(registrant) Columbia Funds Series Trust II

By (Signature and Title) /s/ Daniel J. Beckman
Daniel J. Beckman, President and Principal Executive Officer

Date July 23, 2025

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title) /s/ Daniel J. Beckman
Daniel J. Beckman, President and Principal Executive Officer

Date July 23, 2025

By (Signature and Title) /s/ Michael G. Clarke
Michael G. Clarke, Chief Financial Officer,
Principal Financial Officer and Senior Vice President

Date July 23, 2025

By (Signature and Title) /s/ Charles H. Chiesa
Charles H. Chiesa, Treasurer, Chief Accounting
Officer and Principal Financial Officer

Date July 23, 2025


ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

CODE_OF_ETHICS

302_CERTIFICATION

906_CERTIFICATION

EX-101.SCH

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