Quarterly Holdings Report

for

Fidelity® Long-Term Treasury Bond Index Fund

May 31, 2024

LBX-NPRT1-0724

1.832125.118

U.S. Government and Government Agency Obligations - 99.2%
	Principal Amount (a)	Value ($)
U.S. Treasury Obligations - 99.2%
U.S. Treasury Bonds:
1.125% 5/15/40	28,909,000	17,503,496
1.125% 8/15/40	57,604,000	34,548,899
1.25% 5/15/50	92,053,000	44,818,304
1.375% 11/15/40	98,738,000	61,448,977
1.375% 8/15/50	220,345,000	110,809,434
1.625% 11/15/50	130,631,000	70,285,602
1.75% 8/15/41	87,455,000	57,040,474
1.875% 2/15/41	141,748,000	95,729,733
1.875% 2/15/51	178,310,000	102,368,049
1.875% 11/15/51	189,400,000	107,994,992
2% 11/15/41	77,050,000	52,225,453
2% 2/15/50	103,616,900	61,963,715
2% 8/15/51	107,954,000	63,735,029
2.25% 5/15/41	102,827,000	73,505,238
2.25% 8/15/46	9,663,000	6,364,746
2.25% 8/15/49	52,209,000	33,260,804
2.25% 2/15/52	110,450,000	69,164,998
2.375% 2/15/42	79,900,000	57,440,613
2.375% 11/15/49	84,145,000	55,055,811
2.375% 5/15/51	191,247,000	123,974,373
2.5% 2/15/45	22,364,000	15,757,884
2.5% 2/15/46	18,123,000	12,621,678
2.5% 5/15/46	41,212,000	28,618,192
2.75% 8/15/42	7,787,000	5,914,166
2.75% 11/15/42	30,225,000	22,876,547
2.75% 8/15/47	21,492,000	15,468,363
2.75% 11/15/47	10,975,000	7,881,851
2.875% 5/15/43	78,118,000	59,989,132
2.875% 8/15/45	67,587,500	50,732,867
2.875% 11/15/46	72,529,000	53,815,952
2.875% 5/15/49	35,290,000	25,713,452
2.875% 5/15/52	121,700,000	87,818,910
3% 5/15/42	57,501,000	45,565,051
3% 11/15/44	45,937,000	35,454,033
3% 5/15/45	76,164,000	58,533,224
3% 11/15/45	62,732,000	48,041,440
3% 2/15/47	31,990,000	24,231,175
3% 5/15/47	11,507,000	8,699,472
3% 2/15/48	85,947,000	64,594,542
3% 8/15/48	105,591,000	79,139,630
3% 2/15/49	37,900,000	28,336,172
3% 8/15/52	90,950,000	67,366,949
3.125% 11/15/41	64,820,000	52,744,743
3.125% 2/15/42	106,856,000	86,603,449
3.125% 2/15/43	47,347,000	37,921,988
3.125% 8/15/44	10,234,300	8,088,295
3.125% 5/15/48	88,953,000	68,323,549
3.25% 5/15/42	147,200,000	121,077,750
3.375% 8/15/42	45,700,000	38,179,137
3.375% 5/15/44	19,079,300	15,713,592
3.375% 11/15/48	70,244,000	56,337,883
3.625% 8/15/43	123,303,000	105,973,148
3.625% 2/15/44	73,325,000	62,838,952
3.625% 2/15/53	79,450,000	66,542,478
3.625% 5/15/53	109,600,000	91,807,125
3.75% 8/15/41	95,131,000	84,874,689
3.75% 11/15/43	80,368,000	70,252,933
3.875% 8/15/40	19,822,000	18,127,064
3.875% 2/15/43	7,850,000	7,017,164
3.875% 5/15/43	43,450,000	38,751,969
4% 11/15/42	76,850,000	70,050,576
4% 11/15/52	85,350,000	76,641,633
4.125% 8/15/53	117,400,000	107,677,813
4.25% 5/15/39	1,931,000	1,865,904
4.25% 11/15/40	37,399,000	35,740,880
4.25% 2/15/54	95,550,000	89,622,914
4.375% 11/15/39	18,743,000	18,310,300
4.375% 5/15/40	23,064,000	22,467,579
4.375% 5/15/41	61,803,000	59,825,787
4.375% 8/15/43	39,050,000	37,291,225
4.5% 2/15/36 (b)	22,965,000	23,152,488
4.5% 5/15/38	510,000	509,701
4.5% 8/15/39	8,833,000	8,763,647
4.5% 2/15/44 (b)	49,350,000	47,892,633
4.625% 2/15/40	16,572,000	16,634,145
4.625% 5/15/54	36,900,000	36,853,875
4.75% 2/15/37	18,378,000	18,910,675
4.75% 2/15/41	38,071,000	38,587,041
4.75% 11/15/43	52,200,000	52,330,500
4.75% 11/15/53	87,650,000	89,293,438
5% 5/15/37	7,319,000	7,705,535
TOTAL U.S. GOVERNMENT AND GOVERNMENT AGENCY OBLIGATIONS (Cost $4,948,884,273)		4,037,713,619

Money Market Funds - 2.0%
	Shares	Value ($)
Fidelity Cash Central Fund 5.39% (c)	41,193,257	41,201,495
Fidelity Securities Lending Cash Central Fund 5.39% (c)(d)	40,495,950	40,500,000
TOTAL MONEY MARKET FUNDS (Cost $81,701,495)		81,701,495

TOTAL INVESTMENT IN SECURITIES - 101.2% (Cost $5,030,585,768)	4,119,415,114
NET OTHER ASSETS (LIABILITIES) - (1.2)%	(47,951,166)
NET ASSETS - 100.0%	4,071,463,948

Legend

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

(b) Security or a portion of the security is on loan at period end.

(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.

(d) Investment made with cash collateral received from securities on loan.

Affiliated Central Funds

Fiscal year to date information regarding the Fund's investments in Fidelity Central Funds, including the ownership percentage, is presented below.

Affiliate	Value, beginning of period ($)	Purchases ($)	Sales Proceeds ($)	Dividend Income ($)	Realized Gain (loss) ($)	Change in Unrealized appreciation (depreciation) ($)	Value, end of period ($)	% ownership, end of period
Fidelity Cash Central Fund 5.39%	45,152,929	126,144,210	130,095,722	171,114	78	-	41,201,495	0.1%
Fidelity Securities Lending Cash Central Fund 5.39%	-	98,136,145	57,636,145	10,349	-	-	40,500,000	0.2%
Total	45,152,929	224,280,355	187,731,867	181,463	78	-	81,701,495

Amounts in the dividend income column in the above table include any capital gain distributions from underlying funds.

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 payments received for lending certain types of securities.

Investment Valuation

Investments are valued as of 4:00 p.m. Eastern time on the last calendar day of the period. Securities transactions are accounted for as of trade date. 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 inputs to valuation techniques used to value investments are categorized 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 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. Government and Government Agency 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. Debt securities are generally categorized as Level 2 in the hierarchy but may be Level 3 depending on the circumstances.

Investments in any 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.

For additional information on the Fund's significant accounting policies, please refer to the Fund's most recent semiannual or annual shareholder report.

The fund's schedule of investments as of the date on the cover of this report has not been audited. This report is provided for the general information of the fund's shareholders. For more information regarding the fund and its holdings, please see the fund's most recent prospectus and annual report.

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