Class A

This semi-annual shareholder report contains important information about Columbia Convertible Securities Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class A	$57	1.08%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.08%

^[1]

125

Key Fund Statistics

Table Summary
Fund net assets	$1,731,833,120
Total number of portfolio holdings	125
Portfolio turnover for the reporting period	106%

Top Holdings

Table Summary
Alphabet, Inc. 6.250%	3.1%
Alphabet, Inc. 6.250%	3.0%
Boeing Co. (The) 6.000%	1.9%
Wells Fargo & Co. 7.500%	1.9%
NextEra Energy, Inc. 7.375%	1.8%
Live Nation Entertainment, Inc. 2.875% 01/15/2030	1.8%
Bank of America Corp. 7.250%	1.8%
ON Semiconductor Corp. 0.500% 03/01/2029	1.7%
Western Digital Corp.	1.4%
Microchip Technology, Inc. 0.000% 02/15/2030	1.4%

Class C

This semi-annual shareholder report contains important information about Columbia Convertible Securities Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class C	$97	1.83%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.83%

^[2]

125

Key Fund Statistics

Table Summary
Fund net assets	$1,731,833,120
Total number of portfolio holdings	125
Portfolio turnover for the reporting period	106%

Top Holdings

Table Summary
Alphabet, Inc. 6.250%	3.1%
Alphabet, Inc. 6.250%	3.0%
Boeing Co. (The) 6.000%	1.9%
Wells Fargo & Co. 7.500%	1.9%
NextEra Energy, Inc. 7.375%	1.8%
Live Nation Entertainment, Inc. 2.875% 01/15/2030	1.8%
Bank of America Corp. 7.250%	1.8%
ON Semiconductor Corp. 0.500% 03/01/2029	1.7%
Western Digital Corp.	1.4%
Microchip Technology, Inc. 0.000% 02/15/2030	1.4%

Institutional Class

This semi-annual shareholder report contains important information about Columbia Convertible Securities Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$44	0.83%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.83%

^[3]

125

Key Fund Statistics

Table Summary
Fund net assets	$1,731,833,120
Total number of portfolio holdings	125
Portfolio turnover for the reporting period	106%

Top Holdings

Table Summary
Alphabet, Inc. 6.250%	3.1%
Alphabet, Inc. 6.250%	3.0%
Boeing Co. (The) 6.000%	1.9%
Wells Fargo & Co. 7.500%	1.9%
NextEra Energy, Inc. 7.375%	1.8%
Live Nation Entertainment, Inc. 2.875% 01/15/2030	1.8%
Bank of America Corp. 7.250%	1.8%
ON Semiconductor Corp. 0.500% 03/01/2029	1.7%
Western Digital Corp.	1.4%
Microchip Technology, Inc. 0.000% 02/15/2030	1.4%

Institutional 2 Class

This semi-annual shareholder report contains important information about Columbia Convertible Securities Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 2 Class	$42	0.79%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.79%

^[4]

125

Key Fund Statistics

Table Summary
Fund net assets	$1,731,833,120
Total number of portfolio holdings	125
Portfolio turnover for the reporting period	106%

Top Holdings

Table Summary
Alphabet, Inc. 6.250%	3.1%
Alphabet, Inc. 6.250%	3.0%
Boeing Co. (The) 6.000%	1.9%
Wells Fargo & Co. 7.500%	1.9%
NextEra Energy, Inc. 7.375%	1.8%
Live Nation Entertainment, Inc. 2.875% 01/15/2030	1.8%
Bank of America Corp. 7.250%	1.8%
ON Semiconductor Corp. 0.500% 03/01/2029	1.7%
Western Digital Corp.	1.4%
Microchip Technology, Inc. 0.000% 02/15/2030	1.4%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Convertible Securities Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$40	0.75%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.75%

^[5]

125

Key Fund Statistics

Table Summary
Fund net assets	$1,731,833,120
Total number of portfolio holdings	125
Portfolio turnover for the reporting period	106%

Top Holdings

Table Summary
Alphabet, Inc. 6.250%	3.1%
Alphabet, Inc. 6.250%	3.0%
Boeing Co. (The) 6.000%	1.9%
Wells Fargo & Co. 7.500%	1.9%
NextEra Energy, Inc. 7.375%	1.8%
Live Nation Entertainment, Inc. 2.875% 01/15/2030	1.8%
Bank of America Corp. 7.250%	1.8%
ON Semiconductor Corp. 0.500% 03/01/2029	1.7%
Western Digital Corp.	1.4%
Microchip Technology, Inc. 0.000% 02/15/2030	1.4%

Class S

This semi-annual shareholder report contains important information about Columbia Convertible Securities Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class S	$44	0.83%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.83%

^[6]

125

Key Fund Statistics

Table Summary
Fund net assets	$1,731,833,120
Total number of portfolio holdings	125
Portfolio turnover for the reporting period	106%

Top Holdings

Table Summary
Alphabet, Inc. 6.250%	3.1%
Alphabet, Inc. 6.250%	3.0%
Boeing Co. (The) 6.000%	1.9%
Wells Fargo & Co. 7.500%	1.9%
NextEra Energy, Inc. 7.375%	1.8%
Live Nation Entertainment, Inc. 2.875% 01/15/2030	1.8%
Bank of America Corp. 7.250%	1.8%
ON Semiconductor Corp. 0.500% 03/01/2029	1.7%
Western Digital Corp.	1.4%
Microchip Technology, Inc. 0.000% 02/15/2030	1.4%

Class A

This semi-annual shareholder report contains important information about Columbia Cornerstone Equity Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class A	$48	0.90%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.90%

^[7]

59

Key Fund Statistics

Table Summary
Fund net assets	$1,483,501,188
Total number of portfolio holdings	59
Portfolio turnover for the reporting period	40%

Top Holdings

Table Summary
NVIDIA Corp.	9.2%
Apple, Inc.	6.0%
Microsoft Corp.	5.1%
Alphabet, Inc., Class C	4.9%
Amazon.com, Inc.	3.9%
Broadcom, Inc.	3.6%
Micron Technology, Inc.	2.9%
JPMorgan Chase & Co.	2.5%
Meta Platforms, Inc., Class A	2.4%
MasterCard, Inc., Class A	2.4%

Columbia Cornerstone Equity Fund

NSGCX

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.

columbiathreadneedleus.com/resources/literature

$ 89

$ 1,483,501,188

40.00%

Equity Sector Allocation

Table Summary
Information Technology	36.5%
Financials	12.4%
Health Care	11.0%
Industrials	9.8%
Consumer Discretionary	8.6%
Communication Services	8.2%
Consumer Staples	4.8%
Utilities	3.9%
Energy	2.8%
Real Estate	1.7%

Asset Categories

Table Summary
Common Stocks		99.7%
Other		0.3%

Institutional Class

This semi-annual shareholder report contains important information about Columbia Cornerstone Equity Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$35	0.65%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.65%

^[9]

59

Key Fund Statistics

Table Summary
Fund net assets	$1,483,501,188
Total number of portfolio holdings	59
Portfolio turnover for the reporting period	40%

Top Holdings

Table Summary
NVIDIA Corp.	9.2%
Apple, Inc.	6.0%
Microsoft Corp.	5.1%
Alphabet, Inc., Class C	4.9%
Amazon.com, Inc.	3.9%
Broadcom, Inc.	3.6%
Micron Technology, Inc.	2.9%
JPMorgan Chase & Co.	2.5%
Meta Platforms, Inc., Class A	2.4%
MasterCard, Inc., Class A	2.4%

Columbia Cornerstone Equity Fund

CLCRX

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.

columbiathreadneedleus.com/resources/literature

$ 32

$ 1,483,501,188

40.00%

Equity Sector Allocation

Table Summary
Information Technology	36.5%
Financials	12.4%
Health Care	11.0%
Industrials	9.8%
Consumer Discretionary	8.6%
Communication Services	8.2%
Consumer Staples	4.8%
Utilities	3.9%
Energy	2.8%
Real Estate	1.7%

Asset Categories

Table Summary
Common Stocks		99.7%
Other		0.3%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Cornerstone Equity Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$29	0.54%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.54%

^[11]

59

Key Fund Statistics

Table Summary
Fund net assets	$1,483,501,188
Total number of portfolio holdings	59
Portfolio turnover for the reporting period	40%

Top Holdings

Table Summary
NVIDIA Corp.	9.2%
Apple, Inc.	6.0%
Microsoft Corp.	5.1%
Alphabet, Inc., Class C	4.9%
Amazon.com, Inc.	3.9%
Broadcom, Inc.	3.6%
Micron Technology, Inc.	2.9%
JPMorgan Chase & Co.	2.5%
Meta Platforms, Inc., Class A	2.4%
MasterCard, Inc., Class A	2.4%

Columbia Cornerstone Equity Fund

NSEAX

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.

columbiathreadneedleus.com/resources/literature

$ 35

$ 1,483,501,188

40.00%

Equity Sector Allocation

Table Summary
Information Technology	36.5%
Financials	12.4%
Health Care	11.0%
Industrials	9.8%
Consumer Discretionary	8.6%
Communication Services	8.2%
Consumer Staples	4.8%
Utilities	3.9%
Energy	2.8%
Real Estate	1.7%

Asset Categories

Table Summary
Common Stocks		99.7%
Other		0.3%

Class A

This semi-annual shareholder report contains important information about Columbia Large Cap Enhanced Core Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class A	$45	0.83%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.83%

^[13]

107

Key Fund Statistics

Table Summary
Fund net assets	$496,676,814
Total number of portfolio holdings	107
Portfolio turnover for the reporting period	49%

Top Holdings

Table Summary
NVIDIA Corp.	8.6%
Apple, Inc.	7.6%
Alphabet, Inc., Class A	5.9%
Microsoft Corp.	5.6%
Amazon.com, Inc.	3.3%
Broadcom, Inc.	2.7%
Meta Platforms, Inc., Class A	2.5%
Micron Technology, Inc.	1.7%
ExxonMobil Holdings Corp.	1.4%
MasterCard, Inc., Class A	1.4%

Columbia Large Cap Enhanced Core Fund

NMIMX

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.

columbiathreadneedleus.com/resources/literature

$ 31

$ 496,676,814

49.00%

Equity Sector Allocation

Table Summary
Information Technology	37.6%
Financials	12.1%
Communication Services	9.0%
Health Care	9.0%
Consumer Discretionary	8.8%
Industrials	8.3%
Consumer Staples	4.4%
Energy	3.6%
Materials	2.2%
Utilities	2.1%
Other	1.9%

Asset Categories

Table Summary
Common Stocks		99.0%
Other		1.0%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Large Cap Enhanced Core Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$22	0.41%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.41%

^[15]

107

Key Fund Statistics

Table Summary
Fund net assets	$496,676,814
Total number of portfolio holdings	107
Portfolio turnover for the reporting period	49%

Top Holdings

Table Summary
NVIDIA Corp.	8.6%
Apple, Inc.	7.6%
Alphabet, Inc., Class A	5.9%
Microsoft Corp.	5.6%
Amazon.com, Inc.	3.3%
Broadcom, Inc.	2.7%
Meta Platforms, Inc., Class A	2.5%
Micron Technology, Inc.	1.7%
ExxonMobil Holdings Corp.	1.4%
MasterCard, Inc., Class A	1.4%

Columbia Large Cap Enhanced Core Fund

CCERX

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.

columbiathreadneedleus.com/resources/literature

$ 58

$ 496,676,814

49.00%

Equity Sector Allocation

Table Summary
Information Technology	37.6%
Financials	12.1%
Communication Services	9.0%
Health Care	9.0%
Consumer Discretionary	8.8%
Industrials	8.3%
Consumer Staples	4.4%
Energy	3.6%
Materials	2.2%
Utilities	2.1%
Other	1.9%

Asset Categories

Table Summary
Common Stocks		99.0%
Other		1.0%

Class S

This semi-annual shareholder report contains important information about Columbia Large Cap Enhanced Core Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class S	$31	0.58%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.58%

^[17]

107

Key Fund Statistics

Table Summary
Fund net assets	$496,676,814
Total number of portfolio holdings	107
Portfolio turnover for the reporting period	49%

Top Holdings

Table Summary
NVIDIA Corp.	8.6%
Apple, Inc.	7.6%
Alphabet, Inc., Class A	5.9%
Microsoft Corp.	5.6%
Amazon.com, Inc.	3.3%
Broadcom, Inc.	2.7%
Meta Platforms, Inc., Class A	2.5%
Micron Technology, Inc.	1.7%
ExxonMobil Holdings Corp.	1.4%
MasterCard, Inc., Class A	1.4%

Columbia Large Cap Growth Opportunity Fund

NFEAX

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.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class A	$57	1.04%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.04%

^[18]

54

Key Fund Statistics

Table Summary
Fund net assets	$1,312,121,321
Total number of portfolio holdings	54
Portfolio turnover for the reporting period	26%

Summary of Change Legend [Text Block]

Top Holdings

Table Summary
NVIDIA Corp.	15.1%
Alphabet, Inc., Class A	6.0%
Apple, Inc.	5.9%
Microsoft Corp.	5.6%
Broadcom, Inc.	5.2%
Eli Lilly & Co.	3.7%
Meta Platforms, Inc., Class A	3.7%
Visa, Inc., Class A	3.3%
Micron Technology, Inc.	3.0%
Palo Alto Networks, Inc.	2.7%

This is a summary of the changes to the Fund. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611.

Updated Prospectus Web Address

columbiathreadneedleus.com/resources/literature

Institutional Class

Material Fund Change Notice [Text Block]

This semi-annual shareholder report contains important information about Columbia Large Cap Growth Opportunity Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

This report describes changes to the Fund that occurred during the reporting period.

columbiathreadneedleus.com/resources/literature

$ 43

$ 1,312,121,321

26.00%

Information Technology Sub-Industry Allocation

Table Summary
Semiconductors	25.8%
Systems Software	12.9%
Technology Hardware, Storage & Peripherals	7.9%
Communications Equipment	1.9%
Internet Services & Infrastructure	1.8%
Electronic Components	1.5%
Other	0.5%

Equity Sector Allocation

Table Summary
Information Technology	52.4%
Communication Services	10.9%
Industrials	10.2%
Health Care	9.3%
Consumer Discretionary	8.0%
Financials	5.7%
Consumer Staples	1.9%
Real Estate	1.4%

Updated Prospectus Phone Number

Certain Fund Changes

This is a summary of the changes to the Fund. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611.

The Boards of Trustees of Columbia Funds Series Trust and Columbia Funds Series Trust I approved an Agreement and Plan of Reorganization pursuant to which the Fund will transfer all of its assets and liabilities to Columbia Cornerstone Growth Fund (the Acquiring Fund) in exchange for shares of the Acquiring Fund (the Reorganization). The Reorganization is scheduled to be completed on or about November 23, 2026.

1-800-345-6611

Columbia Large Cap Growth Opportunity Fund

CADRX

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.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 2 Class	$40	0.73%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.73%

^[20]

54

Key Fund Statistics

Table Summary
Fund net assets	$1,312,121,321
Total number of portfolio holdings	54
Portfolio turnover for the reporting period	26%

Summary of Change Legend [Text Block]

Top Holdings

Table Summary
NVIDIA Corp.	15.1%
Alphabet, Inc., Class A	6.0%
Apple, Inc.	5.9%
Microsoft Corp.	5.6%
Broadcom, Inc.	5.2%
Eli Lilly & Co.	3.7%
Meta Platforms, Inc., Class A	3.7%
Visa, Inc., Class A	3.3%
Micron Technology, Inc.	3.0%
Palo Alto Networks, Inc.	2.7%

This is a summary of the changes to the Fund. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611.

Updated Prospectus Web Address

columbiathreadneedleus.com/resources/literature

Institutional 3 Class

Material Fund Change Notice [Text Block]

This semi-annual shareholder report contains important information about Columbia Large Cap Growth Opportunity Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

This report describes changes to the Fund that occurred during the reporting period.

columbiathreadneedleus.com/resources/literature

$ 38

$ 1,312,121,321

26.00%

Information Technology Sub-Industry Allocation

Table Summary
Semiconductors	25.8%
Systems Software	12.9%
Technology Hardware, Storage & Peripherals	7.9%
Communications Equipment	1.9%
Internet Services & Infrastructure	1.8%
Electronic Components	1.5%
Other	0.5%

Equity Sector Allocation

Table Summary
Information Technology	52.4%
Communication Services	10.9%
Industrials	10.2%
Health Care	9.3%
Consumer Discretionary	8.0%
Financials	5.7%
Consumer Staples	1.9%
Real Estate	1.4%

Updated Prospectus Phone Number

Certain Fund Changes

This is a summary of the changes to the Fund. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611.

The Boards of Trustees of Columbia Funds Series Trust and Columbia Funds Series Trust I approved an Agreement and Plan of Reorganization pursuant to which the Fund will transfer all of its assets and liabilities to Columbia Cornerstone Growth Fund (the Acquiring Fund) in exchange for shares of the Acquiring Fund (the Reorganization). The Reorganization is scheduled to be completed on or about November 23, 2026.

1-800-345-6611

Columbia Large Cap Growth Opportunity Fund

CLGPX

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.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class R	$70	1.29%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.29%

^[22]

54

Key Fund Statistics

Table Summary
Fund net assets	$1,312,121,321
Total number of portfolio holdings	54
Portfolio turnover for the reporting period	26%

Summary of Change Legend [Text Block]

Top Holdings

Table Summary
NVIDIA Corp.	15.1%
Alphabet, Inc., Class A	6.0%
Apple, Inc.	5.9%
Microsoft Corp.	5.6%
Broadcom, Inc.	5.2%
Eli Lilly & Co.	3.7%
Meta Platforms, Inc., Class A	3.7%
Visa, Inc., Class A	3.3%
Micron Technology, Inc.	3.0%
Palo Alto Networks, Inc.	2.7%

This is a summary of the changes to the Fund. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611.

Updated Prospectus Web Address

columbiathreadneedleus.com/resources/literature

Class S

Material Fund Change Notice [Text Block]

This semi-annual shareholder report contains important information about Columbia Large Cap Growth Opportunity Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

This report describes changes to the Fund that occurred during the reporting period.

columbiathreadneedleus.com/resources/literature

$ 43

$ 1,312,121,321

26.00%

Information Technology Sub-Industry Allocation

Table Summary
Semiconductors	25.8%
Systems Software	12.9%
Technology Hardware, Storage & Peripherals	7.9%
Communications Equipment	1.9%
Internet Services & Infrastructure	1.8%
Electronic Components	1.5%
Other	0.5%

Equity Sector Allocation

Table Summary
Information Technology	52.4%
Communication Services	10.9%
Industrials	10.2%
Health Care	9.3%
Consumer Discretionary	8.0%
Financials	5.7%
Consumer Staples	1.9%
Real Estate	1.4%

Updated Prospectus Phone Number

Certain Fund Changes

This is a summary of the changes to the Fund. For more complete information, you may review the Fund’s prospectus, which is available at columbiathreadneedleus.com/resources/literature or upon request at 1-800-345-6611.

The Boards of Trustees of Columbia Funds Series Trust and Columbia Funds Series Trust I approved an Agreement and Plan of Reorganization pursuant to which the Fund will transfer all of its assets and liabilities to Columbia Cornerstone Growth Fund (the Acquiring Fund) in exchange for shares of the Acquiring Fund (the Reorganization). The Reorganization is scheduled to be completed on or about November 23, 2026.

1-800-345-6611

Columbia Large Cap Index Fund

NEIAX

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.

columbiathreadneedleus.com/resources/literature

$ 24

$ 3,013,752,317

3.00%

Equity Sector Allocation

Table Summary
Information Technology	37.5%
Financials	12.2%
Communication Services	9.4%
Health Care	9.2%
Consumer Discretionary	9.0%
Industrials	8.2%
Consumer Staples	4.4%
Energy	3.4%
Utilities	2.0%
Materials	1.8%
Other	1.8%

Asset Categories

Table Summary
Common Stocks		98.9%
Money Market Funds		1.1%
Other		0.0%^{Footnote Reference*}

Footnote	Description
Footnote^*	Percentage rounds to less than 0.1% or (0.1)%.

Institutional Class

This semi-annual shareholder report contains important information about Columbia Large Cap Index Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$11	0.20%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.20%

^[25]

507

Key Fund Statistics

Table Summary
Fund net assets	$3,013,752,317
Total number of portfolio holdings	507
Portfolio turnover for the reporting period	3%

Top Holdings

Table Summary
NVIDIA Corp.	8.0%
Apple, Inc.	7.0%
Microsoft Corp.	5.6%
Amazon.com, Inc.	3.8%
Alphabet, Inc., Class A	3.0%
Broadcom, Inc.	2.6%
Alphabet, Inc., Class C	2.4%
Meta Platforms, Inc., Class A	1.9%
Micron Technology, Inc.	1.6%
Tesla, Inc.	1.6%

Columbia Large Cap Index Fund

CLXRX

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.

columbiathreadneedleus.com/resources/literature

$ 11

$ 3,013,752,317

3.00%

Equity Sector Allocation

Table Summary
Information Technology	37.5%
Financials	12.2%
Communication Services	9.4%
Health Care	9.2%
Consumer Discretionary	9.0%
Industrials	8.2%
Consumer Staples	4.4%
Energy	3.4%
Utilities	2.0%
Materials	1.8%
Other	1.8%

Asset Categories

Table Summary
Common Stocks		98.9%
Money Market Funds		1.1%
Other		0.0%^{Footnote Reference*}

Footnote	Description
Footnote^*	Percentage rounds to less than 0.1% or (0.1)%.

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Large Cap Index Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$11	0.20%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.20%

^[27]

507

Key Fund Statistics

Table Summary
Fund net assets	$3,013,752,317
Total number of portfolio holdings	507
Portfolio turnover for the reporting period	3%

Top Holdings

Table Summary
NVIDIA Corp.	8.0%
Apple, Inc.	7.0%
Microsoft Corp.	5.6%
Amazon.com, Inc.	3.8%
Alphabet, Inc., Class A	3.0%
Broadcom, Inc.	2.6%
Alphabet, Inc., Class C	2.4%
Meta Platforms, Inc., Class A	1.9%
Micron Technology, Inc.	1.6%
Tesla, Inc.	1.6%

Columbia Mid Cap Index Fund

NTIAX

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.

columbiathreadneedleus.com/resources/literature

$ 23

$ 2,450,894,159

9.00%

Equity Sector Allocation

Table Summary
Industrials	23.6%
Financials	14.8%
Information Technology	14.5%
Health Care	10.3%
Consumer Discretionary	9.8%
Real Estate	6.9%
Materials	5.9%
Energy	5.1%
Consumer Staples	3.3%
Utilities	3.0%
Other	1.6%

Asset Categories

Table Summary
Common Stocks		98.8%
Money Market Funds		1.2%

Institutional Class

This semi-annual shareholder report contains important information about Columbia Mid Cap Index Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$10	0.20%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.20%

^[29]

402

Key Fund Statistics

Table Summary
Fund net assets	$2,450,894,159
Total number of portfolio holdings	402
Portfolio turnover for the reporting period	9%

Top Holdings

Table Summary
Twilio, Inc., Class A	1.0%
Illumina, Inc.	0.9%
TechnipFMC PLC	0.9%
Everpure, Inc., Class A	0.8%
Okta, Inc.	0.8%
ATI, Inc.	0.8%
nVent Electric PLC	0.7%
Carpenter Technology Corp.	0.7%
U.S. Foods Holding Corp.	0.6%
Tenet Healthcare Corp.	0.6%

Columbia Mid Cap Index Fund

CPXRX

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.

columbiathreadneedleus.com/resources/literature

$ 10

$ 2,450,894,159

9.00%

Equity Sector Allocation

Table Summary
Industrials	23.6%
Financials	14.8%
Information Technology	14.5%
Health Care	10.3%
Consumer Discretionary	9.8%
Real Estate	6.9%
Materials	5.9%
Energy	5.1%
Consumer Staples	3.3%
Utilities	3.0%
Other	1.6%

Asset Categories

Table Summary
Common Stocks		98.8%
Money Market Funds		1.2%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Mid Cap Index Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$10	0.20%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.20%

^[31]

402

Key Fund Statistics

Table Summary
Fund net assets	$2,450,894,159
Total number of portfolio holdings	402
Portfolio turnover for the reporting period	9%

Top Holdings

Table Summary
Twilio, Inc., Class A	1.0%
Illumina, Inc.	0.9%
TechnipFMC PLC	0.9%
Everpure, Inc., Class A	0.8%
Okta, Inc.	0.8%
ATI, Inc.	0.8%
nVent Electric PLC	0.7%
Carpenter Technology Corp.	0.7%
U.S. Foods Holding Corp.	0.6%
Tenet Healthcare Corp.	0.6%

Columbia Overseas Value Fund

COAVX

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.

columbiathreadneedleus.com/resources/literature

$ 58

$ 6,956,234,058

25.00%

Geographic Allocation

Table Summary
Japan	21.5%
United States	12.0%
United Kingdom	7.3%
France	7.2%
Netherlands	5.8%
Canada	5.4%
Germany	4.7%
Hong Kong	4.0%
Italy	3.9%
Australia	3.6%
Other	24.2%

Equity Sector Allocation

Table Summary
Financials	37.8%
Energy	12.0%
Consumer Staples	11.4%
Materials	7.5%
Industrials	7.4%
Health Care	6.9%
Information Technology	5.7%
Consumer Discretionary	3.9%
Real Estate	2.4%
Utilities	1.7%
Other	1.2%

Class C

This semi-annual shareholder report contains important information about Columbia Overseas Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class C	$95	1.89%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.89%

^[33]

115

Key Fund Statistics

Table Summary
Fund net assets	$6,956,234,058
Total number of portfolio holdings	115
Portfolio turnover for the reporting period	25%

Top Holdings

Table Summary
Shell PLC	3.6%
Sumitomo Mitsui Financial Group, Inc.	2.5%
AXA SA	2.5%
TotalEnergies SE	2.4%
ING Groep NV	2.3%
BPER Banca SPA	2.2%
Mebuki Financial Group, Inc.	2.2%
ASR Nederland NV	2.2%
Piraeus Bank SA	2.2%
Bank of Ireland Group PLC	2.1%

Columbia Overseas Value Fund

COSZX

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.

columbiathreadneedleus.com/resources/literature

$ 45

$ 6,956,234,058

25.00%

Geographic Allocation

Table Summary
Japan	21.5%
United States	12.0%
United Kingdom	7.3%
France	7.2%
Netherlands	5.8%
Canada	5.4%
Germany	4.7%
Hong Kong	4.0%
Italy	3.9%
Australia	3.6%
Other	24.2%

Equity Sector Allocation

Table Summary
Financials	37.8%
Energy	12.0%
Consumer Staples	11.4%
Materials	7.5%
Industrials	7.4%
Health Care	6.9%
Information Technology	5.7%
Consumer Discretionary	3.9%
Real Estate	2.4%
Utilities	1.7%
Other	1.2%

Institutional 2 Class

This semi-annual shareholder report contains important information about Columbia Overseas Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 2 Class	$41	0.81%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.81%

^[35]

115

Key Fund Statistics

Table Summary
Fund net assets	$6,956,234,058
Total number of portfolio holdings	115
Portfolio turnover for the reporting period	25%

Top Holdings

Table Summary
Shell PLC	3.6%
Sumitomo Mitsui Financial Group, Inc.	2.5%
AXA SA	2.5%
TotalEnergies SE	2.4%
ING Groep NV	2.3%
BPER Banca SPA	2.2%
Mebuki Financial Group, Inc.	2.2%
ASR Nederland NV	2.2%
Piraeus Bank SA	2.2%
Bank of Ireland Group PLC	2.1%

Columbia Overseas Value Fund

COSYX

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.

columbiathreadneedleus.com/resources/literature

$ 39

$ 6,956,234,058

25.00%

Geographic Allocation

Table Summary
Japan	21.5%
United States	12.0%
United Kingdom	7.3%
France	7.2%
Netherlands	5.8%
Canada	5.4%
Germany	4.7%
Hong Kong	4.0%
Italy	3.9%
Australia	3.6%
Other	24.2%

Equity Sector Allocation

Table Summary
Financials	37.8%
Energy	12.0%
Consumer Staples	11.4%
Materials	7.5%
Industrials	7.4%
Health Care	6.9%
Information Technology	5.7%
Consumer Discretionary	3.9%
Real Estate	2.4%
Utilities	1.7%
Other	1.2%

Class R

This semi-annual shareholder report contains important information about Columbia Overseas Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class R	$71	1.40%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.40%

^[37]

115

Key Fund Statistics

Table Summary
Fund net assets	$6,956,234,058
Total number of portfolio holdings	115
Portfolio turnover for the reporting period	25%

Top Holdings

Table Summary
Shell PLC	3.6%
Sumitomo Mitsui Financial Group, Inc.	2.5%
AXA SA	2.5%
TotalEnergies SE	2.4%
ING Groep NV	2.3%
BPER Banca SPA	2.2%
Mebuki Financial Group, Inc.	2.2%
ASR Nederland NV	2.2%
Piraeus Bank SA	2.2%
Bank of Ireland Group PLC	2.1%

Columbia Overseas Value Fund

COSBX

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.

columbiathreadneedleus.com/resources/literature

$ 45

$ 6,956,234,058

25.00%

Geographic Allocation

Table Summary
Japan	21.5%
United States	12.0%
United Kingdom	7.3%
France	7.2%
Netherlands	5.8%
Canada	5.4%
Germany	4.7%
Hong Kong	4.0%
Italy	3.9%
Australia	3.6%
Other	24.2%

Equity Sector Allocation

Table Summary
Financials	37.8%
Energy	12.0%
Consumer Staples	11.4%
Materials	7.5%
Industrials	7.4%
Health Care	6.9%
Information Technology	5.7%
Consumer Discretionary	3.9%
Real Estate	2.4%
Utilities	1.7%
Other	1.2%

Class A

This semi-annual shareholder report contains important information about Columbia Select Mid Cap Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class A	$59	1.11%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

1.11%

^[39]

51

Key Fund Statistics

Table Summary
Fund net assets	$3,343,938,274
Total number of portfolio holdings	51
Portfolio turnover for the reporting period	15%

Top Holdings

Table Summary
Marathon Petroleum Corp.	4.2%
Devon Energy Corp.	2.7%
Popular, Inc.	2.6%
ITT, Inc.	2.5%
AMETEK, Inc.	2.5%
Entergy Corp.	2.5%
Voya Financial, Inc.	2.5%
Quest Diagnostics, Inc.	2.4%
Ameren Corp.	2.4%
U.S. Foods Holding Corp.	2.4%

Columbia Select Mid Cap Value Fund

CMUCX

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.

columbiathreadneedleus.com/resources/literature

$ 99

$ 3,343,938,274

15.00%

Equity Sector Allocation

Table Summary
Financials	17.5%
Industrials	14.9%
Information Technology	11.7%
Health Care	9.2%
Consumer Discretionary	8.4%
Real Estate	7.4%
Energy	6.9%
Utilities	6.2%
Consumer Staples	5.7%
Materials	5.5%
Other	3.7%

Asset Categories

Table Summary
Common Stocks		97.1%
Money Market Funds		2.7%

Institutional Class

This semi-annual shareholder report contains important information about Columbia Select Mid Cap Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$46	0.86%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.86%

^[41]

51

Key Fund Statistics

Table Summary
Fund net assets	$3,343,938,274
Total number of portfolio holdings	51
Portfolio turnover for the reporting period	15%

Top Holdings

Table Summary
Marathon Petroleum Corp.	4.2%
Devon Energy Corp.	2.7%
Popular, Inc.	2.6%
ITT, Inc.	2.5%
AMETEK, Inc.	2.5%
Entergy Corp.	2.5%
Voya Financial, Inc.	2.5%
Quest Diagnostics, Inc.	2.4%
Ameren Corp.	2.4%
U.S. Foods Holding Corp.	2.4%

Columbia Select Mid Cap Value Fund

CVERX

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.

columbiathreadneedleus.com/resources/literature

$ 42

$ 3,343,938,274

15.00%

Equity Sector Allocation

Table Summary
Financials	17.5%
Industrials	14.9%
Information Technology	11.7%
Health Care	9.2%
Consumer Discretionary	8.4%
Real Estate	7.4%
Energy	6.9%
Utilities	6.2%
Consumer Staples	5.7%
Materials	5.5%
Other	3.7%

Asset Categories

Table Summary
Common Stocks		97.1%
Money Market Funds		2.7%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Select Mid Cap Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$39	0.74%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.74%

^[43]

51

Key Fund Statistics

Table Summary
Fund net assets	$3,343,938,274
Total number of portfolio holdings	51
Portfolio turnover for the reporting period	15%

Top Holdings

Table Summary
Marathon Petroleum Corp.	4.2%
Devon Energy Corp.	2.7%
Popular, Inc.	2.6%
ITT, Inc.	2.5%
AMETEK, Inc.	2.5%
Entergy Corp.	2.5%
Voya Financial, Inc.	2.5%
Quest Diagnostics, Inc.	2.4%
Ameren Corp.	2.4%
U.S. Foods Holding Corp.	2.4%

Columbia Select Mid Cap Value Fund

CMVRX

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.

columbiathreadneedleus.com/resources/literature

$ 72

$ 3,343,938,274

15.00%

Equity Sector Allocation

Table Summary
Financials	17.5%
Industrials	14.9%
Information Technology	11.7%
Health Care	9.2%
Consumer Discretionary	8.4%
Real Estate	7.4%
Energy	6.9%
Utilities	6.2%
Consumer Staples	5.7%
Materials	5.5%
Other	3.7%

Asset Categories

Table Summary
Common Stocks		97.1%
Money Market Funds		2.7%

Class S

This semi-annual shareholder report contains important information about Columbia Select Mid Cap Value Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class S	$46	0.86%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.86%

^[45]

51

Key Fund Statistics

Table Summary
Fund net assets	$3,343,938,274
Total number of portfolio holdings	51
Portfolio turnover for the reporting period	15%

Top Holdings

Table Summary
Marathon Petroleum Corp.	4.2%
Devon Energy Corp.	2.7%
Popular, Inc.	2.6%
ITT, Inc.	2.5%
AMETEK, Inc.	2.5%
Entergy Corp.	2.5%
Voya Financial, Inc.	2.5%
Quest Diagnostics, Inc.	2.4%
Ameren Corp.	2.4%
U.S. Foods Holding Corp.	2.4%

Columbia Small Cap Index Fund

NMSAX

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.

columbiathreadneedleus.com/resources/literature

$ 24

$ 2,604,973,821

15.00%

Equity Sector Allocation

Table Summary
Financials	18.8%
Industrials	17.2%
Consumer Discretionary	13.7%
Information Technology	12.3%
Health Care	10.8%
Real Estate	6.4%
Energy	6.1%
Materials	4.3%
Consumer Staples	3.5%
Communication Services	3.4%
Other	2.0%

Asset Categories

Table Summary
Common Stocks		98.5%
Other		1.5%

Institutional Class

This semi-annual shareholder report contains important information about Columbia Small Cap Index Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$11	0.20%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.20%

^[47]

608

Key Fund Statistics

Table Summary
Fund net assets	$2,604,973,821
Total number of portfolio holdings	608
Portfolio turnover for the reporting period	15%

Top Holdings

Table Summary
iShares Core S&P Small-Cap ETF	0.7%
Corcept Therapeutics, Inc.	0.6%
Glaukos Corp.	0.6%
Paycom Software, Inc.	0.5%
Brinker International, Inc.	0.5%
Match Group, Inc.	0.5%
Jackson Financial, Inc., Class A	0.5%
Viasat, Inc.	0.5%
Protagonist Therapeutics, Inc.	0.5%
CarMax, Inc.	0.5%

Columbia Small Cap Index Fund

CXXRX

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.

columbiathreadneedleus.com/resources/literature

$ 11

$ 2,604,973,821

15.00%

Equity Sector Allocation

Table Summary
Financials	18.8%
Industrials	17.2%
Consumer Discretionary	13.7%
Information Technology	12.3%
Health Care	10.8%
Real Estate	6.4%
Energy	6.1%
Materials	4.3%
Consumer Staples	3.5%
Communication Services	3.4%
Other	2.0%

Asset Categories

Table Summary
Common Stocks		98.5%
Other		1.5%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Small Cap Index Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$11	0.20%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.20%

^[49]

608

Key Fund Statistics

Table Summary
Fund net assets	$2,604,973,821
Total number of portfolio holdings	608
Portfolio turnover for the reporting period	15%

Top Holdings

Table Summary
iShares Core S&P Small-Cap ETF	0.7%
Corcept Therapeutics, Inc.	0.6%
Glaukos Corp.	0.6%
Paycom Software, Inc.	0.5%
Brinker International, Inc.	0.5%
Match Group, Inc.	0.5%
Jackson Financial, Inc., Class A	0.5%
Viasat, Inc.	0.5%
Protagonist Therapeutics, Inc.	0.5%
CarMax, Inc.	0.5%

Columbia Small Cap Value and Inflection Fund

COVAX

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.

columbiathreadneedleus.com/resources/literature

$ 65

$ 905,253,911

58.00%

Equity Sector Allocation

Table Summary
Financials	21.5%
Industrials	15.8%
Real Estate	11.6%
Health Care	10.4%
Information Technology	8.3%
Energy	8.2%
Materials	7.8%
Consumer Discretionary	7.0%
Consumer Staples	4.1%
Communication Services	2.5%
Other	2.0%

Asset Categories

Table Summary
Common Stocks		99.2%
Other		1.0%

Institutional Class

This semi-annual shareholder report contains important information about Columbia Small Cap Value and Inflection Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$51	0.95%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.95%

^[51]

101

Key Fund Statistics

Table Summary
Fund net assets	$905,253,911
Total number of portfolio holdings	101
Portfolio turnover for the reporting period	58%

Top Holdings

Table Summary
Phillips Edison & Co., Inc.	1.9%
Essent Group Ltd.	1.7%
Korn/Ferry International	1.7%
Insight Enterprises, Inc.	1.7%
Fulton Financial Corp.	1.7%
Associated Banc-Corp.	1.6%
Texas Capital Bancshares, Inc.	1.6%
ICU Medical, Inc.	1.6%
Avient Corp.	1.6%
Polaris, Inc.	1.5%

Columbia Small Cap Value and Inflection Fund

CRRRX

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.

columbiathreadneedleus.com/resources/literature

$ 43

$ 905,253,911

58.00%

Equity Sector Allocation

Table Summary
Financials	21.5%
Industrials	15.8%
Real Estate	11.6%
Health Care	10.4%
Information Technology	8.3%
Energy	8.2%
Materials	7.8%
Consumer Discretionary	7.0%
Consumer Staples	4.1%
Communication Services	2.5%
Other	2.0%

Asset Categories

Table Summary
Common Stocks		99.2%
Other		1.0%

Institutional 3 Class

This semi-annual shareholder report contains important information about Columbia Small Cap Value and Inflection Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$41	0.75%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.75%

^[53]

101

Key Fund Statistics

Table Summary
Fund net assets	$905,253,911
Total number of portfolio holdings	101
Portfolio turnover for the reporting period	58%

Top Holdings

Table Summary
Phillips Edison & Co., Inc.	1.9%
Essent Group Ltd.	1.7%
Korn/Ferry International	1.7%
Insight Enterprises, Inc.	1.7%
Fulton Financial Corp.	1.7%
Associated Banc-Corp.	1.6%
Texas Capital Bancshares, Inc.	1.6%
ICU Medical, Inc.	1.6%
Avient Corp.	1.6%
Polaris, Inc.	1.5%

Columbia Small Cap Value and Inflection Fund

CCTRX

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.

columbiathreadneedleus.com/resources/literature

$ 78

$ 905,253,911

58.00%

Equity Sector Allocation

Table Summary
Financials	21.5%
Industrials	15.8%
Real Estate	11.6%
Health Care	10.4%
Information Technology	8.3%
Energy	8.2%
Materials	7.8%
Consumer Discretionary	7.0%
Consumer Staples	4.1%
Communication Services	2.5%
Other	2.0%

Asset Categories

Table Summary
Common Stocks		99.2%
Other		1.0%

Class S

This semi-annual shareholder report contains important information about Columbia Small Cap Value and Inflection Fund (the Fund) for the period of March 1, 2026 to August 31, 2026.

1-800-345-6611

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class S	$51	0.95%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

0.95%

^[55]

101

Key Fund Statistics

Table Summary
Fund net assets	$905,253,911
Total number of portfolio holdings	101
Portfolio turnover for the reporting period	58%