Prospectus - Investment Objective

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 811-02105

Fidelity Salem Street Trust

(Exact name of registrant as specified in charter)

245 Summer St., Boston, MA 02210

(Address of principal executive offices) (Zip code)

Nicole Macarchuk, Secretary

245 Summer St.

Boston, Massachusetts 02210

(Name and address of agent for service)

Registrant's telephone number, including area code:

617-563-7000


Date of fiscal year end:	February 28

Date of reporting period:	August 31, 2026

Item 1.

Reports to Stockholders


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® Short-Term Treasury Bond Index Fund Fidelity® Short-Term Treasury Bond Index Fund : FUMBX

This semi-annual shareholder report contains information about Fidelity® Short-Term Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® Short-Term Treasury Bond Index Fund	$ 2	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$3,618,655,497
Number of Holdings	112
Portfolio Turnover	42%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
0.01 - 0.99%	6.8
1 - 1.99%	11.6
2 - 2.99%	4.9
3 - 3.99%	45.3
4 - 4.99%	30.6

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.2
	Short-Term Investments and Net Other Assets (Liabilities) - 0.8

TOP HOLDINGS (% of Fund's net assets)
US Treasury Notes	99.2
	99.2

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9914565.102 3049-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® Series Long-Term Treasury Bond Index Fund Fidelity® Series Long-Term Treasury Bond Index Fund : FTLTX

This semi-annual shareholder report contains information about Fidelity® Series Long-Term Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® Series Long-Term Treasury Bond Index Fund	$ 0 A	0.00%B

AAmount represents less than $.50

BAmount represents less than 0.005%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$20,577,410,467
Number of Holdings	95
Portfolio Turnover	15%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
1 - 1.99%	6.1
2 - 2.99%	28.3
3 - 3.99%	20.2
4 - 4.99%	41.3
5 - 5.99%	3.3

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.2
	Short-Term Investments and Net Other Assets (Liabilities) - 0.8

TOP HOLDINGS (% of Fund's net assets)
US Treasury Bonds	98.3
US Treasury Notes	0.9
	99.2

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9914574.102 2840-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® SAI U.S. Treasury Bond Index Fund Fidelity® SAI U.S. Treasury Bond Index Fund : FUTBX

This semi-annual shareholder report contains information about Fidelity® SAI U.S. Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® SAI U.S. Treasury Bond Index Fund	$ 2	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$8,427,896,061
Number of Holdings	228
Portfolio Turnover	32%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
0.01 - 0.99%	6.2
1 - 1.99%	17.0
2 - 2.99%	15.3
3 - 3.99%	23.4
4 - 4.99%	32.2
5 - 5.99%	1.5
6 - 6.99%	3.4

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.0
	Short-Term Investments and Net Other Assets (Liabilities) - 1.0

TOP HOLDINGS (% of Fund's net assets)
US Treasury Notes	75.1
US Treasury Bonds	23.9
	99.0

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9914573.102 2814-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® SAI Long-Term Treasury Bond Index Fund Fidelity® SAI Long-Term Treasury Bond Index Fund : FBLTX

This semi-annual shareholder report contains information about Fidelity® SAI Long-Term Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® SAI Long-Term Treasury Bond Index Fund	$ 1	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$12,850,439,242
Number of Holdings	45
Portfolio Turnover	34%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
1 - 1.99%	11.5
2 - 2.99%	17.7
3 - 3.99%	19.6
4 - 4.99%	46.1
5 - 5.99%	4.3

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.2
	Short-Term Investments and Net Other Assets (Liabilities) - 0.8

TOP HOLDINGS (% of Fund's net assets)
US Treasury Bonds	99.2
	99.2

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9914572.102 2801-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® Long-Term Treasury Bond Index Fund Fidelity® Long-Term Treasury Bond Index Fund : FNBGX

This semi-annual shareholder report contains information about Fidelity® Long-Term Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® Long-Term Treasury Bond Index Fund	$ 1	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$4,942,865,700
Number of Holdings	98
Portfolio Turnover	20%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
1 - 1.99%	11.6
2 - 2.99%	18.3
3 - 3.99%	24.0
4 - 4.99%	40.0
5 - 5.99%	5.3

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.2
	Short-Term Investments and Net Other Assets (Liabilities) - 0.8

TOP HOLDINGS (% of Fund's net assets)
US Treasury Bonds	97.8
US Treasury Notes	1.4
	99.2

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9914567.102 3047-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® Intermediate Treasury Bond Index Fund Fidelity® Intermediate Treasury Bond Index Fund : FUAMX

This semi-annual shareholder report contains information about Fidelity® Intermediate Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® Intermediate Treasury Bond Index Fund	$ 1	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$8,447,950,210
Number of Holdings	44
Portfolio Turnover	38%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
1 - 1.99%	7.3
2 - 2.99%	5.6
3 - 3.99%	20.5
4 - 4.99%	65.9

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.3
	Short-Term Investments and Net Other Assets (Liabilities) - 0.7

TOP HOLDINGS (% of Fund's net assets)
US Treasury Notes	99.3
US Treasury Bonds	0.0
	99.3

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9914566.102 3045-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® SAI Intermediate Treasury Bond Index Fund Fidelity® SAI Intermediate Treasury Bond Index Fund : FSIWX

This semi-annual shareholder report contains information about Fidelity® SAI Intermediate Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® SAI Intermediate Treasury Bond Index Fund	$ 2	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$1,485,617,207
Number of Holdings	27
Portfolio Turnover	64%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
1 - 1.99%	11.7
2 - 2.99%	8.7
3 - 3.99%	21.5
4 - 4.99%	57.0

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 98.9
	Short-Term Investments and Net Other Assets (Liabilities) - 1.1

TOP HOLDINGS (% of Fund's net assets)
US Treasury Notes	98.9
	98.9

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9916272.101 7703-TSRS-1026


	SEMI-ANNUAL SHAREHOLDER REPORT \| AS OF AUGUST 31, 2026
	Fidelity® SAI Short-Term Treasury Bond Index Fund Fidelity® SAI Short-Term Treasury Bond Index Fund : FSSWX

This semi-annual shareholder report contains information about Fidelity® SAI Short-Term Treasury Bond Index Fund for the period March 1, 2026 to August 31, 2026. You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.

What were your Fund costs for the last six months?

(based on hypothetical $10,000 investment)

	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Fidelity® SAI Short-Term Treasury Bond Index Fund	$ 2	0.03%

Key Fund Statistics

(as of August 31, 2026)

KEY FACTS
Fund Size	$673,741,788
Number of Holdings	133
Portfolio Turnover	174%

What did the Fund invest in?
(as of August 31, 2026)

COUPON DISTRIBUTION (% of Fund's net assets)
0.01 - 0.99%	7.6
1 - 1.99%	12.4
2 - 2.99%	7.7
3 - 3.99%	39.6
4 - 4.99%	31.7
5 - 5.99%	0.0
6 - 6.99%	0.1

ASSET ALLOCATION (% of Fund's net assets)

	U.S. Treasury Obligations - 99.1
	Short-Term Investments and Net Other Assets (Liabilities) - 0.9

TOP HOLDINGS (% of Fund's net assets)
US Treasury Notes	99.0
US Treasury Bonds	0.1
	99.1

Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2026 FMR LLC. All rights reserved.
		For additional information about the Fund; including its prospectus, financial information, holdings and proxy information, scan the QR code or visit fundresearch.fidelity.com/prospectus/sec 1.9916277.101 7700-TSRS-1026

Item 2.

Code of Ethics

Not applicable.

Item 3.

Audit Committee Financial Expert

Not applicable.

Item 4.

Principal Accountant Fees and Services

Not applicable.

Item 5.

Audit Committee of Listed Registrants

Not applicable.

Item 6.

Investments

(a)

Not applicable.

(b)

Not applicable

Item 7.

Financial Statements and Financial Highlights for Open-End Management Investment Companies

Fidelity® Series Long-Term Treasury Bond Index Fund

Semi-Annual Report

August 31, 2026

Contents

Item 7: Financial Statements and Financial Highlights for Open-End Management Investment Companies (Semi-Annual Report)

Fidelity® Series Long-Term Treasury Bond Index Fund

Notes to Financial Statements

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

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

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

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

To view a fund's proxy voting guidelines and proxy voting record for the 12-month period ended June 30, visit http://www.fidelity.com/proxyvotingresults or visit the Securities and Exchange Commission's (SEC) web site at http://www.sec.gov.

You may also call 1-800-544-8544 to request a free copy of the proxy voting guidelines.

"BLOOMBERG ®" and the Bloomberg indices listed herein (the "Indices") are service marks of Bloomberg Finance L.P. and its affiliates, including Bloomberg Index Services Limited ("BISL"), the administrator of the Indices (collectively, "Bloomberg") and have been licensed for use for certain purposes by Fidelity. Bloomberg is not affiliated with Fidelity, and Bloomberg does not approve, endorse, review, or recommend the fund. Bloomberg does not guarantee the timeliness, accuracy, or completeness of any data or information relating to the fund.

Standard & Poor's, S&P and S&P 500 are registered service marks of The McGraw-Hill Companies, Inc. and have been licensed for use by Fidelity Distributors Corporation.

Other third-party marks appearing herein are the property of their respective owners.

This report and the financial statements contained herein are submitted for the general information of the shareholders of the Fund. This report is not authorized for distribution to prospective investors in the Fund unless preceded or accompanied by an effective prospectus.

A fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-PORT. Forms N-PORT are available on the SEC's web site at http://www.sec.gov. A fund's Forms N-PORT may be reviewed and copied at the SEC's Public Reference Room in Washington, DC. Information regarding the operation of the SEC's Public Reference Room may be obtained by calling 1-800-SEC-0330.

For a complete list of a fund's portfolio holdings, view the most recent holdings listing, semiannual report, or annual report on Fidelity's web site at http://www.fidelity.com, http://www.institutional.fidelity.com, or http://www.401k.com, as applicable.

NOT FDIC INSURED •MAY LOSE VALUE •NO BANK GUARANTEE

Neither the Fund nor Fidelity Distributors Corporation is a bank.

Item 7: Financial Statements and Financial Highlights for Open-End Management Investment Companies (Semi-Annual Report)

Fidelity® Series Long-Term Treasury Bond Index Fund

Schedule of Investments August 31, 2026 (Unaudited)

Showing Percentage of Net Assets

U.S. Treasury Obligations - 99.2%
	Yield (%) (a)	Principal Amount (b)	Value ($)
US Treasury Bonds 1.125% 5/15/2040	4.69 to 5.01	75,817,000	46,657,071
US Treasury Bonds 1.125% 8/15/2040	4.84	30,500,000	18,566,875
US Treasury Bonds 1.25% 5/15/2050	4.88 to 5.10	44,500,000	20,174,492
US Treasury Bonds 1.375% 11/15/2040	2.32 to 3.49	240,063,000	150,752,062
US Treasury Bonds 1.75% 8/15/2041	1.97 to 4.77	283,940,000	184,527,725
US Treasury Bonds 1.875% 11/15/2051	3.11 to 4.80	353,820,000	185,009,159
US Treasury Bonds 1.875% 2/15/2041	1.92 to 4.40	633,606,000	426,842,545
US Treasury Bonds 1.875% 2/15/2051	2.30 to 4.79	417,705,000	221,204,166
US Treasury Bonds 2% 11/15/2041	1.85 to 4.09	836,780,000	561,557,828
US Treasury Bonds 2% 2/15/2050	4.82	170,649,000	94,923,506
US Treasury Bonds 2% 8/15/2051	1.90 to 4.92	767,020,000	415,838,696
US Treasury Bonds 2.25% 2/15/2052	2.17 to 5.04	1,427,240,000	818,265,680
US Treasury Bonds 2.25% 5/15/2041	1.83 to 4.45	831,582,000	588,214,330
US Treasury Bonds 2.25% 8/15/2046	3.02 to 5.31	259,141,000	162,256,683
US Treasury Bonds 2.25% 8/15/2049	2.55 to 4.83	240,147,000	142,756,133
US Treasury Bonds 2.375% 11/15/2049	4.26 to 4.94	361,492,000	220,086,495
US Treasury Bonds 2.375% 2/15/2042	2.60 to 3.32	690,660,000	487,778,625
US Treasury Bonds 2.375% 5/15/2051	4.78 to 5.08	40,874,000	24,379,106
US Treasury Bonds 2.5% 2/15/2045	2.99 to 4.23	686,749,000	463,367,790
US Treasury Bonds 2.5% 2/15/2046	3.02 to 4.87	186,618,000	123,692,743
US Treasury Bonds 2.5% 5/15/2046	3.02 to 3.43	136,970,000	90,432,303
US Treasury Bonds 2.75% 11/15/2042	1.48 to 4.32	193,274,000	142,056,390
US Treasury Bonds 2.75% 11/15/2047	3.06 to 4.90	267,357,000	180,821,057
US Treasury Bonds 2.75% 8/15/2042	3.01 to 4.15	252,260,000	186,435,906
US Treasury Bonds 2.75% 8/15/2047	2.39 to 3.20	458,264,000	310,975,086
US Treasury Bonds 2.875% 11/15/2046	3.06 to 4.65	11,125,000	7,804,448
US Treasury Bonds 2.875% 5/15/2043	2.31 to 4.03	241,482,000	179,168,323
US Treasury Bonds 2.875% 5/15/2049	1.40 to 4.92	596,099,000	405,510,317
US Treasury Bonds 2.875% 5/15/2052	3.02 to 4.96	269,780,000	178,054,800
US Treasury Bonds 2.875% 8/15/2045	3.36 to 4.04	18,732,000	13,371,428
US Treasury Bonds 3% 11/15/2044	3.01 to 3.82	148,737,000	109,641,248
US Treasury Bonds 3% 11/15/2045	1.74 to 4.73	393,262,000	285,821,595
US Treasury Bonds 3% 2/15/2047	1.89 to 3.13	489,794,000	350,202,710
US Treasury Bonds 3% 2/15/2048	2.53 to 3.88	424,609,000	299,896,691
US Treasury Bonds 3% 2/15/2049	4.28 to 5.19	368,387,000	257,367,245
US Treasury Bonds 3% 5/15/2042	3.14 to 4.13	79,079,000	60,906,275
US Treasury Bonds 3% 5/15/2045	2.33 to 4.02	158,044,000	115,643,758
US Treasury Bonds 3% 5/15/2047	1.92 to 4.50	234,862,000	167,421,743
US Treasury Bonds 3% 8/15/2048	2.39 to 4.52	203,982,000	143,265,483
US Treasury Bonds 3% 8/15/2052	4.17 to 5.04	534,780,000	361,624,086
US Treasury Bonds 3.125% 11/15/2041	1.92 to 3.03	59,163,000	46,863,567
US Treasury Bonds 3.125% 2/15/2042	2.65 to 3.99	154,840,000	121,972,791
US Treasury Bonds 3.125% 2/15/2043	3.14 to 5.01	72,321,000	55,924,473
US Treasury Bonds 3.125% 5/15/2048	1.51 to 4.93	273,142,000	196,843,623
US Treasury Bonds 3.125% 8/15/2044	1.96 to 4.20	77,966,000	58,852,148
US Treasury Bonds 3.25% 5/15/2042	4.64	16,800,000	13,394,719
US Treasury Bonds 3.375% 11/15/2048	3.70 to 5.19	310,991,000	233,243,250
US Treasury Bonds 3.375% 5/15/2044	2.95 to 3.01	122,930,000	96,759,356
US Treasury Bonds 3.5% 2/15/2039	3.03 to 4.37	97,534,000	85,376,539
US Treasury Bonds 3.625% 2/15/2044	1.64 to 5.05	150,357,000	123,040,187
US Treasury Bonds 3.625% 2/15/2053	3.67 to 5.08	331,880,000	253,330,744
US Treasury Bonds 3.625% 5/15/2053	3.85 to 4.94	427,000,000	325,654,219
US Treasury Bonds 3.625% 8/15/2043	4.12 to 5.02	85,132,000	70,090,905
US Treasury Bonds 3.75% 11/15/2043	3.09 to 4.82	56,869,000	47,498,944
US Treasury Bonds 3.75% 8/15/2041	2.19 to 4.60	107,358,000	92,562,726
US Treasury Bonds 3.875% 8/15/2040	4.78	189,600,000	168,366,281
US Treasury Bonds 4% 11/15/2042	3.96 to 5.22	224,120,000	195,693,529
US Treasury Bonds 4% 11/15/2052	5.03 to 5.04	300,500,000	245,611,797
US Treasury Bonds 4.125% 8/15/2044	4.60 to 4.80	92,400,000	80,611,782
US Treasury Bonds 4.125% 8/15/2053	4.70 to 5.07	501,600,000	418,444,125
US Treasury Bonds 4.25% 11/15/2040	2.93 to 3.12	47,867,000	44,187,224
US Treasury Bonds 4.25% 2/15/2054	4.37 to 5.05	313,300,000	266,782,294
US Treasury Bonds 4.25% 5/15/2039	3.03 to 4.73	13,257,000	12,460,544
US Treasury Bonds 4.25% 8/15/2054	4.13 to 5.27	648,700,000	552,383,256
US Treasury Bonds 4.375% 11/15/2039	4.63 to 4.84	169,400,000	160,096,234
US Treasury Bonds 4.375% 2/15/2038	2.35 to 4.41	152,224,000	147,294,559
US Treasury Bonds 4.375% 5/15/2040	4.06 to 4.75	114,924,900	108,146,126
US Treasury Bonds 4.375% 5/15/2041	3.88 to 4.79	20,568,000	19,141,095
US Treasury Bonds 4.375% 8/15/2043	4.91 to 5.20	109,500,000	99,508,125
US Treasury Bonds 4.5% 11/15/2054	4.37 to 4.80	604,100,000	536,469,120
US Treasury Bonds 4.5% 2/15/2044	4.85 to 4.99	99,200,000	91,225,251
US Treasury Bonds 4.5% 5/15/2038	3.97 to 4.79	81,600,000	79,547,250
US Treasury Bonds 4.5% 8/15/2039	4.14	48,244,000	46,312,356
US Treasury Bonds 4.625% 11/15/2044	4.83 to 4.88	59,000,000	54,865,391
US Treasury Bonds 4.625% 11/15/2045	4.71 to 4.94	344,800,000	319,155,500
US Treasury Bonds 4.625% 11/15/2055	4.67 to 5.00	748,100,000	678,199,406
US Treasury Bonds 4.625% 2/15/2040	4.62 to 4.85	61,043,000	59,078,178
US Treasury Bonds 4.625% 2/15/2055	4.47 to 4.92	668,900,000	606,269,013
US Treasury Bonds 4.625% 5/15/2044	4.68 to 4.75	205,600,000	191,754,125
US Treasury Bonds 4.625% 5/15/2054	4.34 to 5.26	503,100,000	456,052,292
US Treasury Bonds 4.75% 11/15/2043	4.73 to 4.93	897,200,000	852,690,465
US Treasury Bonds 4.75% 11/15/2053	4.21 to 4.85	738,000,000	682,188,751
US Treasury Bonds 4.75% 2/15/2041	4.82 to 4.87	126,671,100	123,068,891
US Treasury Bonds 4.75% 2/15/2056	4.63 to 5.13	87,100,000	80,649,156
US Treasury Bonds 4.75% 5/15/2055	4.79 to 5.00	642,600,000	594,279,494
US Treasury Bonds 4.75% 8/15/2055	4.67 to 5.07	265,800,000	245,875,382
US Treasury Bonds 4.875% 8/15/2045	4.70 to 5.24	299,000,000	286,058,906
US Treasury Bonds 5% 5/15/2037	2.38 to 4.41	85,827,000	87,888,860
US Treasury Bonds 5% 5/15/2045	4.79 to 4.89	90,000,000	87,532,031
US Treasury Bonds 5% 5/15/2046	4.98 to 5.27	170,200,000	165,173,781
US Treasury Bonds 5% 5/15/2056	5.25	120,100,000	115,746,375
US Treasury Bonds 5.125% 8/15/2046	5.23	49,900,000	49,213,875
US Treasury Bonds 5.125% 8/15/2056	5.21 to 5.24	188,000,000	184,798,125
US Treasury Notes 4.75% 2/15/2045	4.94	198,200,000	187,043,508
TOTAL U.S. TREASURY OBLIGATIONS (Cost $25,008,138,385)			20,404,543,246

Money Market Funds - 1.0%
	Yield (%)	Shares	Value ($)
Fidelity Cash Central Fund (c) (Cost $215,723,829)	3.69	215,681,413	215,724,550

TOTAL INVESTMENT IN SECURITIES - 100.2% (Cost $25,223,862,214)	20,620,267,796
NET OTHER ASSETS (LIABILITIES) - (0.2)%	(42,857,329)
NET ASSETS - 100.0%	20,577,410,467

Legend

(a)	Yield represents either the annualized yield at the date of purchase, or the stated coupon rate, or, for floating and adjustable rate securities, the rate at period end.

(b)	Amount is stated in United States dollars unless otherwise noted.

(c)

Affiliated fund that is generally available only to investment companies and other accounts managed by Fidelity Investments. The rate quoted is the annualized seven-day yield of the fund at period end. A complete unaudited listing of the fund's holdings as of its most recent quarter end is available upon request. In addition, each Fidelity Central Fund's financial statements are available on the SEC's website or upon request.

Affiliated Underlying Funds

Fiscal year to date information regarding the Fund's investments in affiliated underlying funds is presented below. Exchanges between classes of the same affiliated underlying funds may occur. If an underlying fund changes its name, the name presented below is the name in effect at period end.

Affiliate	Value, beginning of period ($)	Purchases ($)	Sales Proceeds ($)	Dividend Income ($)	Realized Gain (loss) ($)	Change in Unrealized appreciation (depreciation) ($)	Value, end of period ($)	Shares, end of period
Fidelity Cash Central Fund	281,514,585	806,305,030	872,090,167	1,479,870	(5,619)	721	215,724,550	215,681,413
Fidelity Securities Lending Cash Central Fund	-	403,587,663	403,587,663	8,397	-	-	-	-
	281,514,585	1,209,892,693	1,275,677,830	1,488,267	(5,619)	721	215,724,550

Amounts in the dividend income column in the above table include any capital gain distributions from underlying funds, which are presented in the corresponding line item in the Statement of Operations, if applicable.

Amounts included in the purchases and sales proceeds columns may include in-kind transactions, if applicable.

Amounts in the dividend income column for Fidelity Securities Lending Cash Central Fund represents the income earned on investing cash collateral, less rebates paid to borrowers and any lending agent fees associated with the loan, plus any premium income received for lending certain types of securities.

Investment Valuation

The following is a summary of the inputs used, as of August 31, 2026, involving the Fund's assets and liabilities carried at fair value. The inputs or methodology used for valuing securities may not be an indication of the risk associated with investing in those securities. For more information on valuation inputs, and their aggregation into the levels used below, please refer to the Investment Valuation section in the accompanying Notes to Financial Statements.

Valuation Inputs at Reporting Date:
Description	Total ($)	Level 1 ($)	Level 2 ($)	Level 3 ($)
Investments in Securities:

U.S. Treasury Obligations	20,404,543,246	-	20,404,543,246	-

Money Market Funds	215,724,550	215,724,550	-	-
Total Investments in Securities:	20,620,267,796	215,724,550	20,404,543,246	-

Financial Statements (Unaudited)

Statement of Assets and Liabilities

As of August 31, 2026 (Unaudited)
Assets
Investments in securities, at value - unaffiliated issuers	$	20,404,543,246
Investments in securities, at value - affiliated issuers		215,724,550
Receivable for fund shares sold		177,094,346
Interest receivable		156,375,535
Distributions receivable from affiliated funds		362,267
Total assets		20,954,099,944
Liabilities
Payable for investments purchased		286,565,461
Payable for fund shares redeemed		90,077,584
Distributions payable		9,313
Other payables and accrued expenses		37,119
Total liabilities		376,689,477
Net Assets	$	20,577,410,467
Net assets consist of:
Paid in capital		28,359,175,485
Total accumulated earnings (loss)		(7,781,765,018)
Net Assets	$	20,577,410,467

Net Asset Value and Maximum Offering
Net Asset Value, offering price and redemption price per share ($20,577,410,467/4,020,655,382 shares)	$	5.12



Other Information
Unaffiliated issuers, cost		25,008,138,385
Affiliated issuers, cost		215,723,829

Statement of Operations

Six months ended August 31, 2026 (Unaudited)

Investment Income
Dividends - affiliated issuers	$	1,488,267
Interest		429,882,820
Total investment income		431,371,087
Expenses
Custodian fees and expenses		71,460
Independent trustees' fees and expenses		21,662
Total expenses		93,122
Expense reductions		(352)
Total expenses after reductions		92,770
Net investment income (loss)		431,278,317
Net realized gain (loss)
Investments - unaffiliated issuers		(262,554,959)
Investments - affiliated issuers		(5,619)
Net realized gain (loss)		(262,560,578)
Change in net unrealized appreciation (depreciation)
Investments - unaffiliated issuers		(1,461,213,433)
Investments - affiliated issuers		721
Total change in net unrealized appreciation (depreciation)		(1,461,212,712)
Net gain (loss)		(1,723,773,290)
Net increase (decrease) in net assets resulting from operations	$	(1,292,494,973)
Other Information
Income from securities lending - Affiliated Issuers		8,397

Statement of Changes in Net Assets
		Six months ended August 31, 2026 (Unaudited)		Year ended February 28, 2026
Increase (Decrease) in Net Assets
Operations
Net investment income (loss)	$	431,278,317	$	886,643,255
Net realized gain (loss)		(262,560,578)		(1,015,428,044)
Change in net unrealized appreciation (depreciation)		(1,461,212,712)		956,755,262
Net increase (decrease) in net assets resulting from operations	$	(1,292,494,973)	$	827,970,473
Distributions to shareholders
Distributions to shareholders		(401,313,602)		(820,656,717)
Total distributions		(401,313,602)		(820,656,717)
Net increase (decrease) in net assets resulting from share transactions		2,166,371,233		(945,770,429)
Total increase (decrease) in net assets		472,562,658		(938,456,673)
Net Assets
Beginning of period		20,104,847,809		21,043,304,482
End of period	$	20,577,410,467	$	20,104,847,809

Financial Highlights

Fidelity® Series Long-Term Treasury Bond Index Fund

		Six months ended August 31, 2026 (Unaudited)		Years ended February 28, 2026		2025		2024 A		2023		2022
Selected Per Share Data
Net asset value, beginning of period	$	5.57	$	5.58	$	5.59	$	5.94	$	8.05	$	8.33
Income from Investment Operations
Net investment income (loss) B, C		.12		.22		.21		.20		.19		.18
Net realized and unrealized gain (loss)		(.46)		(.02)		(.02) D		(.36)		(2.13)		(.26)
Total from investment operations		(.34)		.20		.19		(.16)		(1.94)		(.08)
Distributions
Distributions from net investment income		(.11)		(.21)		(.20)		(.19)		(.17)		(.17)
Distributions from net realized gain		-		-		-		-		-		(.03)
Total distributions		(.11)		(.21)		(.20)		(.19)		(.17)		(.20)
Net asset value, end of period	$	5.12	$	5.57	$	5.58	$	5.59	$	5.94	$	8.05
Total Return E, F		(6.17)%		3.72%		3.44%		(2.77)%		(24.16)%		(1.01)%
Ratios and Supplemental Data C, G, H
Ratio of expenses to average net assets before reductions		-% I, J		-% J		-% J		-% J		-% J		-% J
Ratio of expenses to average net assets net of fee waivers, if any		-% I, J		-% J		-% J		-% J		-% J		-% J
Ratio of expenses to average net assets net of all reductions, if any		-% I, J		-% J		-% J		-% J		-% J		-% J
Ratio of net investment income (loss) to average net assets		4.36% I		4.15%		3.84%		3.53%		2.87%		2.10%
Net assets, end of period	$	20,577,410,467	$	20,104,847,809	$	21,043,304,482	$	19,763,542,381	$	17,545,737,821	$	15,129,018,181
Portfolio turnover rate K		15% I		20%		18%		11%		10%		18%

AFor the year ended February 29.

BCalculated based on average shares outstanding during the period.

CNet investment income (loss) is affected by the timing of the declaration of dividends by any underlying mutual funds or exchange-traded funds (ETFs). Net investment income (loss) of any mutual funds or ETFs is not included in the Fund's net investment income (loss) ratio.

DThe amount shown for a share outstanding does not correspond with the aggregate net gain (loss) on investments for the period due to the timing of sales and repurchases of shares in relation to fluctuating market values of the investments of the Fund.

ETotal returns for periods of less than one year are not annualized.

FTotal returns would have been lower if certain expenses had not been reduced during the applicable periods shown.

GFees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses.

HExpense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

IAnnualized.

JAmount represents less than .005%.

KAmount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs), derivatives or securities that mature within one year from acquisition.

Notes to Financial Statements

(Unaudited)

For the period ended August 31, 2026

1. Organization.

Fidelity® Series Long-Term Treasury Bond Index Fund (the Fund) is a fund of Fidelity Salem Street Trust (the Trust) and is authorized to issue an unlimited number of shares. 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.

Shares are offered only to certain other Fidelity funds, Fidelity managed 529 plans, and Fidelity managed collective investment trusts.

2. Significant Accounting Policies.

The Fund is an investment company and applies the accounting and reporting guidance of the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946 Financial Services - Investment Companies. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP), which require management to make certain estimates and assumptions at the date of the financial statements. Actual results could differ from those estimates. The Fund operates as a single operating segment. The Fund's portfolio management team, part of the investment adviser, serves as the chief operating decision maker (CODM) and directs the Fund's investments in accordance with its investment objective and policies, with support from others responsible for oversight functions. The information reviewed by the CODM is consistent with the Fund's financial statements and financial highlights. Subsequent events, if any, through the date that the financial statements were issued have been evaluated in the preparation of the financial statements. The Fund's Schedule of Investments lists any underlying mutual funds or exchange-traded funds but does not include the underlying holdings of these funds. The following summarizes the significant accounting policies of the Fund:

Investment Valuation. Investments are valued as of 4:00 p.m. Eastern time on the last calendar day of the period. The Board of Trustees (the Board) has designated the Fund's investment adviser as the valuation designee responsible for the fair valuation function and performing fair value determinations as needed. The investment adviser has established a Fair Value Committee (the Committee) to carry out the day-to-day fair valuation responsibilities and has adopted policies and procedures to govern the fair valuation process and the activities of the Committee. In accordance with these fair valuation policies and procedures, which have been approved by the Board, the Fund attempts to obtain prices from one or more third party pricing services or brokers to value its investments. When current market prices, quotations or currency exchange rates are not readily available or reliable, investments will be fair valued in good faith by the Committee, in accordance with the policies and procedures. Factors used in determining fair value vary by investment type and may include market or investment specific events, transaction data, estimated cash flows, and market observations of comparable investments. The frequency that the fair valuation procedures are used cannot be predicted and they may be utilized to a significant extent. The Committee manages the Fund's fair valuation practices and maintains the fair valuation policies and procedures. The Fund's investment adviser reports to the Board information regarding the fair valuation process and related material matters.

The Fund categorizes the inputs to valuation techniques used to value its investments into a disclosure hierarchy consisting of three levels as shown below:

Level 1 - unadjusted quoted prices in active markets for identical investments

Level 2 - other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, etc.)

Level 3 - unobservable inputs (including the Fund's own assumptions based on the best information available)

Valuation techniques used to value the Fund's investments by major category are as follows:

Debt securities, including restricted securities, are valued based on evaluated prices received from third party pricing services or from brokers who make markets in such securities. U.S. Treasury Obligations are valued by pricing services who utilize matrix pricing which considers yield or price of bonds of comparable quality, coupon, maturity and type or by broker-supplied prices. When independent prices are unavailable or unreliable, debt securities may be valued utilizing pricing methodologies which consider similar factors that would be used by third party pricing services. For any foreign debt securities, when significant market or security specific events arise, valuations may be determined in good faith in accordance with procedures adopted by the Board. Debt securities are generally categorized as Level 2 in the hierarchy but may be Level 3 depending on the circumstances.

Investments in open-end mutual funds are valued at their closing net asset value (NAV) each business day and are categorized as Level 1 in the hierarchy.

Changes in valuation techniques may result in transfers in or out of an assigned level within the disclosure hierarchy. The aggregate value of investments by input level as of period end is included at the end of the Fund's Schedule of Investments.

Investment Transactions and Income. For financial reporting purposes, the investment holdings and net asset value (NAV) include trades executed through the end of the last business day of the period. The NAV per share for processing shareholder transactions is calculated as of the close of business of the New York Stock Exchange (NYSE), normally 4:00 p.m. Eastern time and includes trades executed through the end of the prior business day.

Gains and losses on securities sold are determined on the basis of identified cost.

Dividend income for domestic securities is recorded on the ex-dividend date. Certain dividends from any foreign securities where the ex-dividend date may have passed are recorded as soon as a fund is informed of the ex-dividend date. Non-cash dividends, if any, are recorded at the fair market value of the securities received.

Income and capital gain distributions from any underlying mutual funds or exchange-traded funds (ETFs) are recorded on the ex-dividend date.

Interest income is accrued as earned and includes coupon interest and amortization of premium and accretion of discount on debt securities as applicable. Debt obligations may be placed on non-accrual status and related interest income may be reduced by ceasing current accruals and writing off interest receivables when the collection of all or a portion of interest has become doubtful based on consistently applied procedures. A debt obligation is removed from non-accrual status when the issuer resumes interest payments or when collectability of interest is reasonably assured.

Expenses. Expenses directly attributable to a fund are charged to that fund. Expenses attributable to more than one fund are allocated among the respective funds on the basis of relative net assets or other appropriate methods. Expenses included in the accompanying financial statements reflect the expenses of that fund and do not include any expenses associated with any underlying mutual funds or exchange-traded funds. Although not included in a fund's expenses, a fund indirectly bears its proportionate share of these expenses through the net asset value of each underlying mutual fund or exchange-traded fund. Expense estimates are accrued in the period to which they relate and adjustments are made when actual amounts are known.

Income Tax Information and Distributions to Shareholders. Each year, the Fund intends to qualify as a regulated investment company under Subchapter M of the Internal Revenue Code, including distributing substantially all of its taxable income and realized gains. As a result, no provision for U.S. Federal income taxes is required. The Fund files a U.S. federal tax return, in addition to state and local tax returns as required. The Fund's federal income tax returns are subject to examination by the Internal Revenue Service (IRS) for a period of three fiscal years after they are filed. State and local tax returns may be subject to examination for an additional fiscal year depending on the jurisdiction.

Distributions are declared and recorded daily and paid monthly from net investment income. Distributions from realized gains, if any, are declared and recorded on the ex-dividend date.

Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from GAAP. These differences may result in distribution reclassifications.

Capital accounts within the financial statements are adjusted for permanent book-tax differences. These adjustments have no impact on net assets or the results of operations. Capital accounts are not adjusted for temporary book-tax differences which will reverse in a subsequent period.

Book-tax differences are primarily due to: capital loss carryforwards, market discount, and losses deferred due to wash sales.

As of period end, the cost and unrealized appreciation (depreciation) in securities, and derivatives if applicable, for federal income tax purposes were as follows:

	Tax Cost ($)	Gross unrealized appreciation ($)	Gross unrealized depreciation ($)	Net unrealized appreciation (depreciation) ($)
Fidelity® Series Long-Term Treasury Bond Index Fund	25,127,755,032	1,064,577	(4,508,551,813)	(4,507,487,236)

Capital loss carryforwards are only available to offset future capital gains of the Funds to the extent provided by regulations and may be limited. The capital loss carryforward information presented below, including any applicable limitation, is estimated as of prior fiscal period end and is subject to adjustment.

	Short-term ($)	Long-term ($)	Total capital loss carryforward ($)
Fidelity® Series Long-Term Treasury Bond Index Fund	(168,047,652)	(2,864,142,643)	(3,032,190,295)

3. Fees and Other Transactions with Affiliates.

Management Fee. Fidelity Management & Research Company LLC (the investment adviser) and its affiliates provides the Fund with investment management related services.

The Fund does not pay a management fee for these services.

Under the management contract, the investment adviser pays all other operating expenses, except custody fees, fees and expenses of the independent Trustees, and certain miscellaneous expenses such as proxy and shareholder meeting expenses.

Interfund Trades. Funds may purchase from or sell securities to other Fidelity Funds under procedures adopted by the Board of Trustees. The procedures have been designed to ensure these interfund trades are executed in accordance with Rule 17a-7 of the 1940 Act. During the period, there were no interfund trades.

4. Committed Line of Credit.

Certain Funds participate with other funds managed by the investment adviser or an affiliate in a $4.25 billion credit facility (the "line of credit") to be utilized for temporary or emergency purposes to fund shareholder redemptions or for other short-term liquidity purposes.

Commitment fees are charged based on the unused amount of the line of credit at an annual rate of .10%, and then allocated to each participating fund based on its pro-rata portion of the line of credit.

The commitment fees are borne by the investment adviser.

Interest is charged to a participating fund based on its borrowings at an annual rate of .75% plus the highest of (i) daily SOFR, (ii) Federal Funds Effective Rate, or (iii) Overnight Bank Funding Rate. During the period, there were no borrowings on this line of credit.

The line of credit agreement will expire in March 2027 unless extended or renewed.

5. Security Lending.

Funds lend portfolio securities from time to time in order to earn additional income. Lending agents are used, including National Financial Services (NFS), an affiliate of the investment adviser. Pursuant to a securities lending agreement, NFS will receive a fee, which is capped at 9.9% of a fund's daily lending revenue, for its services as lending agent. A fund may lend securities to certain qualified borrowers, including NFS. On the settlement date of the loan, the borrowers provide collateral (in the form of U.S. Treasury obligations, letters of credit and/or cash) against the loaned securities and maintains collateral in an amount not less than 100% of the fair value of the loaned securities during the period of the loan. The fair value of the loaned securities is determined at the close of business of a fund and any additional required collateral is delivered to a fund on the next business day. A fund or borrower may terminate the loan at any time, and if the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund may apply collateral received from the borrower against the obligation. A fund may experience delays and costs in recovering the securities loaned or gaining access to non-cash collateral. Any cash collateral received is invested in the Fidelity Securities Lending Cash Central Fund. Any loaned securities are identified as such in the Schedule of Investments, and the value of loaned securities and cash collateral at period end, as applicable, are presented in the Statement of Assets and Liabilities. For cash collateral, securities lending income represents the income earned on investing cash collateral less rebates paid to borrowers, plus any premium income received and is presented in the Statement of Operations in dividends - affiliated issuers. For non-cash collateral, securities lending income represents fees received from borrowers as compensation for the securities loaned and is presented in the Statement of Operations in security lending income - unaffiliated issuers. Securities lending income is reduced by any lending agent fees associated with the loan. Affiliated security lending activity, if any, was as follows:

	Total Security Lending Fees Paid to NFS ($)	Security Lending Income From Securities Loaned to NFS ($)	Value of Securities Loaned to NFS at Period End ($)

Fidelity® Series Long-Term Treasury Bond Index Fund	912	-	-

6. Expense Reductions.

Through arrangements with the custodian, credits realized as a result of certain uninvested cash balances were used to reduce expenses. All of the applicable credits are presented in the table below.

	Custodian Credits ($)
Fidelity® Series Long-Term Treasury Bond Index Fund	352

7. Distributions to Shareholders.

Distributions to shareholders of each class were as follows:

	Six months ended ($)	Year ended ($)
	August 31, 2026	February 28, 2026
Fidelity® Series Long-Term Treasury Bond Index Fund
Fidelity® Series Long-Term Treasury Bond Index Fund	401,313,602	820,656,717
Total	401,313,602	820,656,717

8. Share Transactions.

Share transactions were as follows and may contain in kind transactions, automatic conversions between classes or exchanges between affiliated funds as applicable:

	Shares	Shares	Dollars	Dollars
	Six months ended	Year ended	Six months ended ($)	Year ended ($)
	August 31, 2026	February 28, 2026	August 31, 2026	February 28, 2026

Fidelity® Series Long-Term Treasury Bond Index Fund
Shares sold	817,428,793	896,928,622	4,265,532,771	4,848,698,133
Reinvestment of distributions	76,685,883	151,490,082	401,295,588	820,605,963
Shares redeemed	(481,069,267)	(1,209,675,124)	(2,500,457,126)	(6,615,074,525)
Net increase (decrease)	413,045,409	(161,256,420)	2,166,371,233	(945,770,429)

9. Other.

A fund's organizational documents provide former and current trustees and officers with a limited indemnification against liabilities arising in connection with the performance of their duties to the fund. In the normal course of business, a fund may also enter into contracts that provide general indemnifications. A fund's maximum exposure under these arrangements is unknown as this would be dependent on future claims that may be made against a fund. The risk of material loss from such claims is considered remote.

At the end of the period, mutual funds and accounts managed by the investment adviser or its affiliates were the owners of record of all of the outstanding shares of the Fund.

10. Risk and Uncertainties.

Many factors affect a fund's performance. Developments that disrupt global economies and financial markets, such as public health emergencies, military conflicts, terrorism, government restrictions, political changes, and environmental disasters, may significantly affect a fund's investment performance. The effects of these developments to a fund will be impacted by the types of securities in which a fund invests, the financial condition, industry, economic sector, and geographic location of an issuer, and a fund's level of investment in the securities of that issuer. Significant concentrations in security types, issuers, industries, sectors, and geographic locations may magnify the factors that affect a fund's performance.

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

(Unaudited)

Note: This is not applicable for any fund included in this document.

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

(Unaudited)

Note: This is not applicable for any fund included in this document.

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

(Unaudited)

Note: This information is disclosed as part of the financial statements for each Fund as part of Item 7: Financial Statements and Financial Highlights for Open-End Management Investment Companies.

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

(Unaudited)

Note: This is not applicable for any fund included in this document.

1.9872675.110

XS8-SANN-1026

Fidelity® SAI U.S. Treasury Bond Index Fund

Semi-Annual Report

August 31, 2026

Offered exclusively to certain clients of the Adviser, or its affiliates, including Strategic Advisers LLC (Strategic Advisers) - not available for sale to the general public. Fidelity® SAI is a product name of Fidelity® funds dedicated to certain programs affiliated with Strategic Advisers.

Contents

Item 7: Financial Statements and Financial Highlights for Open-End Management Investment Companies (Semi-Annual Report)

Fidelity® SAI U.S. Treasury Bond Index Fund

Notes to Financial Statements

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

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

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

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

You may also call 1-800-544-3455 to request a free copy of the proxy voting guidelines.

Standard & Poor's, S&P and S&P 500 are registered service marks of The McGraw-Hill Companies, Inc. and have been licensed for use by Fidelity Distributors Corporation.

Other third-party marks appearing herein are the property of their respective owners.

NOT FDIC INSURED •MAY LOSE VALUE •NO BANK GUARANTEE

Neither the Fund nor Fidelity Distributors Corporation is a bank.

Item 7: Financial Statements and Financial Highlights for Open-End Management Investment Companies (Semi-Annual Report)

Fidelity® SAI U.S. Treasury Bond Index Fund

Schedule of Investments August 31, 2026 (Unaudited)

Showing Percentage of Net Assets

U.S. Treasury Obligations - 99.0%
	Yield (%) (a)	Principal Amount (b)	Value ($)
US Treasury Bonds 1.125% 5/15/2040	3.41 to 4.98	49,284,000	30,328,911
US Treasury Bonds 1.125% 8/15/2040	2.16 to 3.74	13,237,000	8,058,024
US Treasury Bonds 1.25% 5/15/2050	3.79	72,000	32,642
US Treasury Bonds 1.375% 11/15/2040	2.22 to 2.31	24,934,300	15,657,961
US Treasury Bonds 1.375% 8/15/2050	4.03 to 5.25	22,870,000	10,672,965
US Treasury Bonds 1.625% 11/15/2050	4.70	17,637,500	8,779,479
US Treasury Bonds 1.75% 8/15/2041	2.05 to 3.46	89,327,000	58,052,082
US Treasury Bonds 1.875% 11/15/2051	4.41	66,263,000	34,648,301
US Treasury Bonds 1.875% 2/15/2041	2.27	11,829,000	7,968,865
US Treasury Bonds 1.875% 2/15/2051	2.40 to 4.40	89,631,000	47,465,916
US Treasury Bonds 2% 11/15/2041	2.42 to 3.45	71,400,000	47,916,094
US Treasury Bonds 2% 2/15/2050	3.51 to 3.79	30,778,000	17,120,263
US Treasury Bonds 2% 8/15/2051	3.35 to 4.83	55,545,000	30,113,635
US Treasury Bonds 2.25% 2/15/2052	3.02 to 3.93	56,800,000	32,564,594
US Treasury Bonds 2.25% 5/15/2041	3.39	16,033,000	11,340,842
US Treasury Bonds 2.25% 8/15/2046	3.41 to 5.31	43,500,000	27,236,777
US Treasury Bonds 2.25% 8/15/2049	3.53	80,000	47,556
US Treasury Bonds 2.375% 2/15/2042	3.24	32,900,000	23,235,625
US Treasury Bonds 2.375% 5/15/2051	4.47 to 5.06	93,537,000	55,789,705
US Treasury Bonds 2.5% 2/15/2045	4.15	2,401,000	1,620,018
US Treasury Bonds 2.5% 2/15/2046	3.09 to 4.86	19,423,000	12,873,807
US Treasury Bonds 2.5% 5/15/2046	2.98 to 4.81	25,983,000	17,154,870
US Treasury Bonds 2.75% 11/15/2042	4.05	4,426,000	3,253,110
US Treasury Bonds 2.75% 11/15/2047	3.09	318,000	215,072
US Treasury Bonds 2.75% 8/15/2042	3.26 to 4.84	59,738,000	44,150,116
US Treasury Bonds 2.75% 8/15/2047	3.25	2,731,000	1,853,240
US Treasury Bonds 2.875% 11/15/2046	3.05 to 4.61	5,289,000	3,710,357
US Treasury Bonds 2.875% 5/15/2043	3.02 to 4.08	50,784,000	37,679,347
US Treasury Bonds 2.875% 5/15/2049	4.62	11,000	7,483
US Treasury Bonds 2.875% 5/15/2052	3.20 to 4.87	12,400,000	8,184,000
US Treasury Bonds 2.875% 8/15/2045	1.43 to 4.94	58,254,000	41,583,343
US Treasury Bonds 3% 11/15/2044	4.13 to 4.76	63,400,000	46,735,211
US Treasury Bonds 3% 11/15/2045	3.71 to 3.99	57,800,000	42,008,860
US Treasury Bonds 3% 2/15/2047	1.70 to 3.41	53,589,000	38,316,135
US Treasury Bonds 3% 2/15/2048	4.97	4,659,000	3,290,601
US Treasury Bonds 3% 2/15/2049	4.59 to 5.12	22,111,000	15,447,470
US Treasury Bonds 3% 5/15/2042	3.25 to 4.92	14,138,000	10,889,021
US Treasury Bonds 3% 5/15/2045	2.40 to 3.83	39,700,000	29,049,234
US Treasury Bonds 3% 5/15/2047	3.38 to 3.41	34,992,000	24,944,102
US Treasury Bonds 3% 8/15/2048	3.80 to 4.89	16,108,000	11,313,353
US Treasury Bonds 3% 8/15/2052	3.93 to 4.67	16,400,000	11,089,859
US Treasury Bonds 3.125% 11/15/2041	3.41 to 4.15	13,564,000	10,744,172
US Treasury Bonds 3.125% 2/15/2042	3.99 to 4.49	12,800,000	10,083,000
US Treasury Bonds 3.125% 2/15/2043	4.54	27,201,000	21,034,023
US Treasury Bonds 3.125% 5/15/2048	4.05	4,500	3,242
US Treasury Bonds 3.375% 11/15/2048	3.13	1,791,300	1,343,475
US Treasury Bonds 3.375% 5/15/2044	4.46	4,800,000	3,778,125
US Treasury Bonds 3.5% 2/15/2039	2.66	315,000	275,736
US Treasury Bonds 3.625% 2/15/2044	3.85 to 4.56	10,956,000	8,965,517
US Treasury Bonds 3.625% 5/15/2053	4.25 to 5.08	31,600,000	24,099,938
US Treasury Bonds 3.625% 8/15/2043	3.59 to 4.55	42,601,000	35,074,269
US Treasury Bonds 3.875% 5/15/2043	4.78	3,000,000	2,562,188
US Treasury Bonds 4% 11/15/2052	4.40 to 4.92	37,200,000	30,405,188
US Treasury Bonds 4.125% 8/15/2053	4.20 to 5.07	122,700,000	102,358,641
US Treasury Bonds 4.25% 11/15/2040	3.71	80,000	73,850
US Treasury Bonds 4.25% 2/15/2054	4.44 to 5.01	45,600,000	38,829,469
US Treasury Bonds 4.25% 5/15/2039	3.45 to 3.99	1,598,000	1,501,995
US Treasury Bonds 4.375% 11/15/2039	4.37	340,000	321,327
US Treasury Bonds 4.375% 2/15/2038	2.80 to 4.74	17,884,000	17,304,866
US Treasury Bonds 4.375% 5/15/2041	3.79	17,000	15,821
US Treasury Bonds 4.5% 11/15/2054	4.37 to 4.80	31,000,000	27,529,453
US Treasury Bonds 4.5% 2/15/2044	4.68 to 4.98	25,800,000	23,725,922
US Treasury Bonds 4.5% 5/15/2038	4.16	24,300,000	23,688,703
US Treasury Bonds 4.5% 8/15/2039	4.39	14,731,000	14,141,185
US Treasury Bonds 4.625% 11/15/2045	4.63 to 4.99	16,300,000	15,087,688
US Treasury Bonds 4.625% 11/15/2055	4.67 to 4.89	40,200,000	36,443,813
US Treasury Bonds 4.625% 2/15/2040	2.99	5,000	4,838
US Treasury Bonds 4.625% 2/15/2046	4.98 to 5.14	37,400,000	34,583,313
US Treasury Bonds 4.625% 2/15/2055	4.58 to 4.92	50,900,000	46,134,090
US Treasury Bonds 4.625% 5/15/2054	4.54 to 4.63	22,100,000	20,033,305
US Treasury Bonds 4.75% 11/15/2043	5.09	15,100,000	14,350,898
US Treasury Bonds 4.75% 11/15/2053	4.00 to 5.21	42,000,000	38,823,750
US Treasury Bonds 4.75% 2/15/2037	2.32 to 2.78	13,000	13,042
US Treasury Bonds 4.75% 2/15/2041	4.03	11,100,000	10,784,344
US Treasury Bonds 4.75% 2/15/2056	4.91 to 4.99	37,500,000	34,722,656
US Treasury Bonds 4.75% 5/15/2055	4.79 to 5.14	45,600,000	42,171,094
US Treasury Bonds 4.75% 8/15/2055	4.67 to 4.94	52,800,000	48,842,062
US Treasury Bonds 4.875% 8/15/2045	4.77 to 4.87	12,600,000	12,054,656
US Treasury Bonds 5% 5/15/2037	2.90 to 4.31	4,967,000	5,086,324
US Treasury Bonds 5% 5/15/2045	4.85 to 5.18	30,100,000	29,274,601
US Treasury Bonds 5% 5/15/2056	4.93 to 5.25	33,300,000	32,092,875
US Treasury Bonds 5.125% 8/15/2056	5.24	15,900,000	15,629,203
US Treasury Bonds 5.25% 11/15/2028	2.65 to 2.98	31,601,000	32,199,691
US Treasury Bonds 5.25% 2/15/2029	3.84	7,274,000	7,436,813
US Treasury Bonds 6.125% 11/15/2027	2.86 to 2.94	139,604,000	142,630,571
US Treasury Bonds 6.25% 5/15/2030	3.95 to 4.21	116,378,000	123,492,514
US Treasury Notes 0.375% 9/30/2027	3.68	61,826,000	59,328,709
US Treasury Notes 0.5% 10/31/2027	3.78	11,000,000	10,534,219
US Treasury Notes 0.625% 11/30/2027	4.18	28,200,700	26,960,310
US Treasury Notes 0.625% 12/31/2027	3.30	15,039,900	14,331,380
US Treasury Notes 0.625% 5/15/2030	0.85 to 3.52	148,227,000	129,021,182
US Treasury Notes 0.625% 8/15/2030	3.18 to 4.31	129,794,900	111,887,260
US Treasury Notes 0.75% 1/31/2028	0.99 to 1.28	122,528,000	116,612,195
US Treasury Notes 0.875% 11/15/2030	3.02 to 3.79	67,580,900	58,328,125
US Treasury Notes 1% 7/31/2028	3.07 to 4.01	145,209,000	136,371,670
US Treasury Notes 1.125% 2/15/2031	4.11	38,500,000	33,359,649
US Treasury Notes 1.125% 2/29/2028	1.28 to 3.05	29,970,000	28,596,765
US Treasury Notes 1.125% 8/31/2028	2.95 to 4.65	129,007,000	121,130,518
US Treasury Notes 1.25% 3/31/2028	1.41 to 3.81	74,408,000	70,952,097
US Treasury Notes 1.25% 4/30/2028	3.55 to 4.18	26,499,000	25,200,963
US Treasury Notes 1.25% 5/31/2028	2.94 to 3.62	51,374,000	48,733,055
US Treasury Notes 1.25% 6/30/2028	4.16	41,135,000	38,919,173
US Treasury Notes 1.25% 8/15/2031	1.62 to 4.49	230,666,000	197,543,804
US Treasury Notes 1.25% 9/30/2028	3.65	3,038,000	2,852,160
US Treasury Notes 1.375% 10/31/2028	4.01 to 4.27	57,900,000	54,362,672
US Treasury Notes 1.375% 11/15/2031	3.04 to 3.44	58,246,000	49,798,055
US Treasury Notes 1.375% 12/31/2028	1.56	23,700,000	22,138,207
US Treasury Notes 1.5% 11/30/2028	3.09	42,500,000	39,913,476
US Treasury Notes 1.5% 2/15/2030	2.99 to 3.64	30,793,000	27,924,199
US Treasury Notes 1.625% 5/15/2031	3.37 to 4.41	107,293,000	94,350,782
US Treasury Notes 1.75% 1/31/2029	2.00 to 4.20	76,700,000	72,112,980
US Treasury Notes 1.75% 11/15/2029	3.01 to 3.89	21,907,000	20,177,545
US Treasury Notes 1.875% 2/15/2032	2.90 to 4.34	83,500,000	72,830,918
US Treasury Notes 1.875% 2/28/2029	3.08 to 3.94	55,400,000	52,145,250
US Treasury Notes 2.25% 11/15/2027	4.33	22,300,000	21,772,988
US Treasury Notes 2.375% 3/31/2029	4.11 to 4.23	87,300,000	83,040,715
US Treasury Notes 2.375% 5/15/2029	0.74 to 4.37	162,799,000	154,493,708
US Treasury Notes 2.625% 2/15/2029	1.40 to 2.51	58,844,000	56,451,164
US Treasury Notes 2.625% 7/31/2029	3.56 to 3.75	29,600,000	28,170,875
US Treasury Notes 2.75% 2/15/2028	0.64 to 4.32	91,818,200	89,820,437
US Treasury Notes 2.75% 5/31/2029	4.52	92,800,000	88,877,750
US Treasury Notes 2.75% 8/15/2032	3.94 to 4.14	69,000,000	62,523,164
US Treasury Notes 2.875% 4/30/2029	2.88 to 3.49	74,400,000	71,580,938
US Treasury Notes 2.875% 5/15/2028	3.03 to 4.46	52,785,000	51,533,418
US Treasury Notes 2.875% 5/15/2032	3.18 to 4.10	86,100,000	78,892,488
US Treasury Notes 2.875% 8/15/2028	1.28 to 4.00	92,876,000	90,332,794
US Treasury Notes 3.125% 11/15/2028	2.49 to 2.88	26,503,000	25,815,578
US Treasury Notes 3.125% 8/31/2029	4.48	29,133,900	28,091,453
US Treasury Notes 3.25% 6/30/2029	3.08	34,300,000	33,254,922
US Treasury Notes 3.375% 11/30/2027	3.50	51,600,000	51,031,594
US Treasury Notes 3.375% 12/31/2027	3.93	61,800,000	61,066,125
US Treasury Notes 3.375% 2/29/2028	3.89	36,200,000	35,716,390
US Treasury Notes 3.375% 5/15/2033	3.96 to 4.91	101,900,000	94,719,234
US Treasury Notes 3.375% 9/15/2028	3.62	14,100,000	13,832,871
US Treasury Notes 3.5% 1/31/2028	3.53	90,700,000	89,704,426
US Treasury Notes 3.5% 1/31/2030	3.60	47,900,000	46,474,227
US Treasury Notes 3.5% 11/15/2028	3.49	22,600,000	22,190,375
US Treasury Notes 3.5% 2/15/2029	3.91	11,200,000	10,970,313
US Treasury Notes 3.5% 2/15/2033	3.72 to 4.53	84,800,000	79,652,375
US Treasury Notes 3.5% 2/28/2031	4.00	52,200,000	50,136,469
US Treasury Notes 3.5% 9/30/2027	3.61 to 3.94	81,500,000	80,868,985
US Treasury Notes 3.625% 10/31/2030	3.78	21,600,000	20,907,281
US Treasury Notes 3.625% 12/31/2030	3.52	60,500,000	58,474,668
US Treasury Notes 3.625% 3/31/2030	4.31	6,500,000	6,323,535
US Treasury Notes 3.625% 8/15/2028	3.58 to 4.00	62,300,000	61,462,844
US Treasury Notes 3.625% 8/31/2029	3.94	5,300,000	5,183,234
US Treasury Notes 3.625% 8/31/2030	3.69	1,000,000	969,335
US Treasury Notes 3.625% 9/30/2030	3.74 to 4.25	18,500,000	17,921,875
US Treasury Notes 3.625% 9/30/2031	4.22	2,000,000	1,919,999
US Treasury Notes 3.75% 1/31/2031	4.43	45,000,000	43,683,399
US Treasury Notes 3.75% 10/31/2032	3.89	35,900,000	34,319,559
US Treasury Notes 3.75% 4/30/2028	3.88	77,500,000	76,785,547
US Treasury Notes 3.75% 6/30/2030	4.08 to 4.26	72,300,000	70,495,324
US Treasury Notes 3.75% 8/31/2031	4.30	33,000,000	31,884,961
US Treasury Notes 3.875% 10/15/2027	4.12	900,000	896,237
US Treasury Notes 3.875% 11/30/2027	4.01	6,500,000	6,467,754
US Treasury Notes 3.875% 11/30/2029	3.99	2,100,000	2,064,808
US Treasury Notes 3.875% 12/31/2029	3.63 to 4.34	22,300,000	21,912,363
US Treasury Notes 3.875% 12/31/2032	4.02 to 4.27	53,200,000	51,146,813
US Treasury Notes 3.875% 3/31/2031	3.94	38,800,000	37,823,938
US Treasury Notes 3.875% 4/15/2029	4.15	34,000,000	33,567,031
US Treasury Notes 3.875% 4/30/2030	3.96	17,700,000	17,359,137
US Treasury Notes 3.875% 4/30/2031	4.02	50,600,000	49,305,351
US Treasury Notes 3.875% 5/15/2029	4.05	31,000,000	30,593,125
US Treasury Notes 3.875% 6/15/2028	4.09	46,500,000	46,129,453
US Treasury Notes 3.875% 6/30/2030	4.23	32,800,000	32,129,906
US Treasury Notes 3.875% 7/15/2028	3.89	13,800,000	13,684,102
US Treasury Notes 3.875% 7/31/2030	3.69 to 3.95	22,200,000	21,736,055
US Treasury Notes 3.875% 8/15/2033	4.57	25,700,000	24,567,594
US Treasury Notes 3.875% 8/15/2034	3.92 to 4.28	83,000,000	78,629,531
US Treasury Notes 3.875% 8/31/2032	3.92	20,200,000	19,477,219
US Treasury Notes 3.875% 9/30/2029	4.08	4,900,000	4,824,012
US Treasury Notes 4% 1/31/2029	3.90	1,400,000	1,387,694
US Treasury Notes 4% 1/31/2031	3.72 to 4.28	148,600,000	145,703,461
US Treasury Notes 4% 1/31/2033	4.20	18,800,000	18,189,000
US Treasury Notes 4% 10/31/2029	4.12	11,200,000	11,059,563
US Treasury Notes 4% 11/15/2035	4.02 to 4.67	87,800,000	83,073,891
US Treasury Notes 4% 2/15/2034	4.69	26,900,000	25,815,594
US Treasury Notes 4% 3/31/2030	3.95	19,100,000	18,820,215
US Treasury Notes 4% 4/30/2032	4.16	21,900,000	21,310,582
US Treasury Notes 4% 5/31/2030	3.78	4,500,000	4,429,863
US Treasury Notes 4% 6/30/2028	4.41	15,400,000	15,309,164
US Treasury Notes 4% 6/30/2032	3.99	29,500,000	28,671,465
US Treasury Notes 4% 7/31/2030	4.05 to 4.35	35,300,000	34,715,344
US Treasury Notes 4% 7/31/2032	3.92 to 4.14	35,100,000	34,089,504
US Treasury Notes 4.125% 10/31/2029	3.70 to 4.15	46,700,000	46,282,254
US Treasury Notes 4.125% 10/31/2031	4.13	5,500,000	5,401,387
US Treasury Notes 4.125% 11/15/2027	3.89 to 4.11	52,900,000	52,800,813
US Treasury Notes 4.125% 11/15/2032	3.91 to 4.34	70,400,000	68,692,250
US Treasury Notes 4.125% 11/30/2029	3.69 to 4.08	64,800,000	64,202,625
US Treasury Notes 4.125% 2/15/2036	3.96 to 4.70	103,554,000	98,780,808
US Treasury Notes 4.125% 2/29/2032	3.92	36,600,000	35,879,438
US Treasury Notes 4.125% 3/31/2029	4.01	30,600,000	30,406,360
US Treasury Notes 4.125% 3/31/2032	4.08 to 4.13	8,000,000	7,838,125
US Treasury Notes 4.125% 4/30/2033	4.21 to 4.43	63,900,000	62,162,719
US Treasury Notes 4.125% 5/31/2031	4.14	39,300,000	38,681,332
US Treasury Notes 4.125% 5/31/2032	4.36	7,400,000	7,242,172
US Treasury Notes 4.125% 6/15/2029	4.36	76,200,000	75,646,360
US Treasury Notes 4.125% 7/15/2029	4.33	37,800,000	37,513,547
US Treasury Notes 4.125% 8/31/2028	4.34	39,700,000	39,537,168
US Treasury Notes 4.125% 9/30/2027	3.56 to 3.83	51,700,000	51,635,387
US Treasury Notes 4.25% 11/15/2034	4.19 to 4.58	75,300,000	73,088,063
US Treasury Notes 4.25% 2/28/2031	4.32	10,600,000	10,498,141
US Treasury Notes 4.25% 3/31/2033	4.13	21,800,000	21,378,477
US Treasury Notes 4.25% 5/15/2035	4.35 to 4.39	68,700,000	66,480,668
US Treasury Notes 4.25% 5/31/2033	4.54	27,700,000	27,135,180
US Treasury Notes 4.25% 6/30/2033	4.31	21,600,000	21,154,500
US Treasury Notes 4.25% 8/15/2029	4.40	46,000,000	45,805,938
US Treasury Notes 4.25% 8/15/2035	4.15 to 4.44	55,100,000	53,242,527
US Treasury Notes 4.375% 1/31/2032	4.44	100,000	99,233
US Treasury Notes 4.375% 11/30/2030	3.87	21,500,000	21,412,656
US Treasury Notes 4.375% 5/15/2034	4.34 to 4.49	83,900,000	82,392,422
US Treasury Notes 4.375% 5/15/2036	4.44	38,600,000	37,502,313
US Treasury Notes 4.375% 7/31/2031	4.42	22,100,000	21,977,414
US Treasury Notes 4.375% 7/31/2033	4.56	22,000,000	21,690,625
US Treasury Notes 4.375% 8/31/2031	4.50	39,500,000	39,287,071
US Treasury Notes 4.5% 11/15/2033	4.30 to 4.34	63,900,000	63,398,285
US Treasury Notes 4.5% 12/31/2031	4.24	5,500,000	5,493,555
US Treasury Notes 4.5% 5/31/2029	3.78 to 3.93	66,500,000	66,666,250
US Treasury Notes 4.5% 8/31/2033	4.61	34,000,000	33,776,875
US Treasury Notes 4.625% 2/15/2035	4.16 to 4.54	76,900,000	76,530,519
US Treasury Notes 4.625% 4/30/2029	3.91 to 4.72	50,100,000	50,389,641
US Treasury Notes 4.625% 5/31/2031	4.29	1,200,000	1,206,187
US Treasury Notes 4.625% 8/15/2036	4.75	26,700,000	26,441,344
US Treasury Notes 4.625% 9/30/2030	4.33	2,900,000	2,916,652
US Treasury Notes 4.75% 2/15/2045	4.94	9,000,000	8,493,398
US Treasury Notes 4.875% 10/31/2030	4.06	26,300,000	26,695,527
TOTAL U.S. TREASURY OBLIGATIONS (Cost $8,777,224,682)			8,342,661,722

Money Market Funds - 0.9%
	Yield (%)	Shares	Value ($)
Fidelity Cash Central Fund (c) (Cost $78,414,771)	3.69	78,399,091	78,414,771

TOTAL INVESTMENT IN SECURITIES - 99.9% (Cost $8,855,639,453)	8,421,076,493
NET OTHER ASSETS (LIABILITIES) - 0.1%	6,819,568
NET ASSETS - 100.0%	8,427,896,061

Legend

(a)	Yield represents either the annualized yield at the date of purchase, or the stated coupon rate, or, for floating and adjustable rate securities, the rate at period end.

(b)	Amount is stated in United States dollars unless otherwise noted.

(c)

Affiliated Underlying Funds

Affiliate	Value, beginning of period ($)	Purchases ($)	Sales Proceeds ($)	Dividend Income ($)	Realized Gain (loss) ($)	Change in Unrealized appreciation (depreciation) ($)	Value, end of period ($)	Shares, end of period
Fidelity Cash Central Fund	92,076,437	221,628,024	235,289,827	550,797	137	-	78,414,771	78,399,091
Fidelity Securities Lending Cash Central Fund	-	986,083,821	986,083,821	(4,066)	-	-	-	-
	92,076,437	1,207,711,845	1,221,373,648	546,731	137	-	78,414,771

Amounts included in the purchases and sales proceeds columns may include in-kind transactions, if applicable.

Investment Valuation

Valuation Inputs at Reporting Date:
Description	Total ($)	Level 1 ($)	Level 2 ($)	Level 3 ($)
Investments in Securities:

U.S. Treasury Obligations	8,342,661,722	-	8,342,661,722	-

Money Market Funds	78,414,771	78,414,771	-	-
Total Investments in Securities:	8,421,076,493	78,414,771	8,342,661,722	-

Financial Statements (Unaudited)

Statement of Assets and Liabilities

As of August 31, 2026 (Unaudited)
Assets
Investments in securities, at value - unaffiliated issuers	$	8,342,661,722
Investments in securities, at value - affiliated issuers		78,414,771
Receivable for investments sold		169,512,978
Receivable for fund shares sold		2,214,518
Interest receivable		55,183,742
Distributions receivable from affiliated funds		174,902
Prepaid expenses		8,747
Receivable from investment adviser for expense reductions		82,750
Total assets		8,648,254,130
Liabilities
Payable for investments purchased		217,094,805
Payable for fund shares redeemed		2,081,341
Distributions payable		850,839
Accrued management fee		281,187
Other payables and accrued expenses		49,897
Total liabilities		220,358,069
Net Assets	$	8,427,896,061
Net assets consist of:
Paid in capital		10,285,249,777
Total accumulated earnings (loss)		(1,857,353,716)
Net Assets	$	8,427,896,061

Net Asset Value and Maximum Offering
Net Asset Value, offering price and redemption price per share ($8,427,896,061/975,172,768 shares)	$	8.64


Other Information
Unaffiliated issuers, cost		8,777,224,682
Affiliated issuers, cost		78,414,771

Statement of Operations

Six months ended August 31, 2026 (Unaudited)

Investment Income
Dividends - affiliated issuers	$	546,731
Interest		161,645,738
Total investment income		162,192,469
Expenses
Management fee		1,680,014
Custodian fees and expenses		31,838
Independent trustees' fees and expenses		9,115
Registration fees		37,447
Audit		30,660
Legal		2,589
Commitment fee		4,958
Miscellaneous		10,246
Total expenses		1,806,867
Expense reductions		(527,998)
Total expenses after reductions		1,278,869
Net investment income (loss)		160,913,600
Net realized gain (loss)
Investments - unaffiliated issuers		(46,261,274)
Investments - affiliated issuers		137
Net realized gain (loss)		(46,261,137)
Change in net unrealized appreciation (depreciation)
Investments - unaffiliated issuers		(293,937,754)
Total change in net unrealized appreciation (depreciation)		(293,937,754)
Net gain (loss)		(340,198,891)
Net increase (decrease) in net assets resulting from operations	$	(179,285,291)
Other Information
Income from securities lending - Affiliated Issuers		(4,066)

Statement of Changes in Net Assets
		Six months ended August 31, 2026 (Unaudited)		Year ended February 28, 2026
Increase (Decrease) in Net Assets
Operations
Net investment income (loss)	$	160,913,600	$	312,892,210
Net realized gain (loss)		(46,261,137)		(141,600,351)
Change in net unrealized appreciation (depreciation)		(293,937,754)		273,658,198
Net increase (decrease) in net assets resulting from operations	$	(179,285,291)	$	444,950,057
Distributions to shareholders
Distributions to shareholders		(128,517,721)		(298,505,643)
Total distributions		(128,517,721)		(298,505,643)
Net increase (decrease) in net assets resulting from share transactions		562,383,454		(1,557,856,560)
Total increase (decrease) in net assets		254,580,442		(1,411,412,146)
Net Assets
Beginning of period		8,173,315,619		9,584,727,765
End of period	$	8,427,896,061	$	8,173,315,619

Financial Highlights

Fidelity® SAI U.S. Treasury Bond Index Fund

		Six months ended August 31, 2026 (Unaudited)		Years ended February 28, 2026		2025		2024 A		2023		2022
Selected Per Share Data
Net asset value, beginning of period	$	8.98	$	8.83	$	8.66	$	8.66	$	9.79	$	10.10
Income from Investment Operations
Net investment income (loss) B, C		.17		.32		.31		.26		.18		.11
Net realized and unrealized gain (loss)		(.38)		.14		.11		(.07)		(1.17)		(.32)
Total from investment operations		(.21)		.46		.42		.19		(.99)		(.21)
Distributions
Distributions from net investment income		(.13)		(.31)		(.25)		(.19)		(.14)		(.10)
Distributions from net realized gain		-		-		-		-		-		.00 D
Total distributions		(.13)		(.31)		(.25)		(.19)		(.14)		(.10)
Net asset value, end of period	$	8.64	$	8.98	$	8.83	$	8.66	$	8.66	$	9.79
Total Return E, F		(2.30)%		5.30%		4.96%		2.25%		(10.10)%		(2.09)%
Ratios and Supplemental Data C, G, H
Ratio of expenses to average net assets before reductions		.04% I		.04%		.04%		.05%		.05%		.05%
Ratio of expenses to average net assets net of fee waivers, if any		.03% I		.03%		.03%		.03%		.03%		.03%
Ratio of expenses to average net assets net of all reductions, if any		.03% I		.03%		.03%		.03%		.03%		.03%
Ratio of net investment income (loss) to average net assets		3.80% I		3.59%		3.51%		2.97%		2.05%		1.06%
Net assets, end of period	$	8,427,896,061	$	8,173,315,619	$	9,584,727,765	$	15,843,238,612	$	13,457,180,745	$	11,227,353,867
Portfolio turnover rate J		32% I		26%		32%		37%		60%		45%

AFor the year ended February 29.

BCalculated based on average shares outstanding during the period.

DAmount represents less than $.005 per share.

ETotal returns would have been lower if certain expenses had not been reduced during the applicable periods shown.

FTotal returns for periods of less than one year are not annualized.

GExpense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

HFees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses.

IAnnualized.

JAmount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs), derivatives or securities that mature within one year from acquisition.

Notes to Financial Statements

(Unaudited)

For the period ended August 31, 2026

1. Organization.

Fidelity® SAI U.S. Treasury Bond Index Fund (the Fund) is a fund of Fidelity Salem Street Trust (the Trust) and is authorized to issue an unlimited number of shares. 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.

Shares are offered exclusively to certain clients of Fidelity Management & Research Company LLC (FMR) or its affiliates.

2. Significant Accounting Policies.