Schedule of Investments (unaudited)  January 31, 2024 iShares U.S. Long Government Bond Index Fund (Percentages shown are based on Net Assets)

Security	Par (000)		Value
U.S. Government Sponsored Agency Securities
Agency Obligations — 1.0%
Fannie Mae, 5.63%, 07/15/37	$	4,000	$	4,543,296
Federal Home Loan Banks
5.63%, 03/14/36		1,000		1,108,089
5.50%, 07/15/36		4,730		5,230,806
Tennessee Valley Authority
5.88%, 04/01/36		11,841		13,476,889
3.50%, 12/15/42		66		55,702
				24,414,782
Total U.S. Government Sponsored Agency Securities — 1.0%
(Cost: $25,639,393)				24,414,782
U.S. Treasury Obligations
U.S. Treasury Bonds
4.50%, 02/15/36 - 08/15/39		29,566		30,997,469
4.75%, 02/15/37 - 11/15/53		94,128		101,909,665
5.00%, 05/15/37		27,415		30,325,703
4.38%, 02/15/38 - 08/15/43		68,570		69,678,551
3.50%, 02/15/39		12,761		11,920,070
4.25%, 05/15/39 - 11/15/40		20,025		20,275,506
4.63%, 02/15/40		16,575		17,480,798
1.13%, 05/15/40 - 08/15/40(a)		119,755		75,593,846
3.88%, 08/15/40 - 05/15/43		54,603		51,450,136
1.38%, 11/15/40 - 08/15/50(a)		127,489		73,700,518
1.88%, 02/15/41 - 11/15/51(a)		221,285		145,180,457
2.25%, 05/15/41 - 02/15/52(a)		294,578		207,009,515
1.75%, 08/15/41		44,509		30,549,517
3.75%, 08/15/41 - 11/15/43		45,466		42,037,616
2.00%, 11/15/41 - 08/15/51(a)		174,541		112,681,239
3.13%, 11/15/41 - 05/15/48		88,536		73,860,132
2.38%, 02/15/42 - 05/15/51(a)		74,460		52,570,212
3.00%, 05/15/42 - 08/15/52(a)		366,992		295,203,362
3.25%, 05/15/42(a)		23,247		20,129,541
2.75%, 08/15/42 - 11/15/47(a)		157,938		123,398,340

Security	Par (000)		Value
U.S. Treasury Obligations (continued)
U.S. Treasury Bonds (continued)
3.38%, 08/15/42 - 11/15/48	$	84,477	$	72,805,263
4.00%, 11/15/42 - 11/15/52(a)		88,000		84,522,992
2.88%, 05/15/43 - 05/15/52(a)		138,608		108,595,361
3.63%, 08/15/43 - 05/15/53(a)		171,656		154,532,986
2.50%, 02/15/45 - 05/15/46(a)		224,930		166,524,431
1.25%, 05/15/50(a)		28,428		14,799,217
1.63%, 11/15/50(a)		145,169		83,591,259
4.13%, 08/15/53(a)		61,500		60,471,797
Total U.S. Treasury Obligations — 98.0% (Cost: $2,745,577,075)				2,331,795,499
Total Long-Term Investments — 99.0% (Cost: $2,771,216,468)				2,356,210,281
	Shares
Short-Term Securities
Money Market Funds — 36.6%
BlackRock Cash Funds: Institutional, SL Agency Shares, 5.51%(b)(c)(d)		869,391,579		869,913,213
Total Short-Term Securities — 36.6% (Cost: $869,779,152)				869,913,213
Total Investments — 135.6% (Cost: $3,640,995,620)				3,226,123,494
Liabilities in Excess of Other Assets — (35.6)%				(846,103,570	)
Net Assets — 100.0%			$	2,380,019,924

^(a)  All or a portion of this security is on loan.

^(b)  Affiliate of the Fund.

^(c)  Annualized 7-day yield as of period end.

^(d)  All or a portion of this security was purchased with the cash collateral from loaned securities.

Affiliates

Investments in issuers considered to be affiliate(s) of the Fund during the period ended January 31, 2024 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 10/31/23		Purchases at Cost			Proceeds from Sale		Net Realized Gain (Loss)		Change in Unrealized Appreciation (Depreciation)			Value at 01/31/24		Shares Held at 01/31/24		Income			Capital Gain  Distributions  from  Underlying  Funds
BlackRock Cash Funds: Institutional, SL Agency Shares	$	771,554,674	$	98,181,127	(a)	$	—	$	309,784	$	(132,372	)	$	869,913,213		869,391,579	$	190,444	(b)	$	—

^(a)  Represents net amount purchased (sold).

^(b)  All or a portion represents securities lending income earned from the reinvestment of cash collateral from loaned securities, net of fees and collateral investment expenses, and other payments to and from borrowers of securities.

1

Schedule of Investments (unaudited) (continued) January 31, 2024 iShares U.S. Long Government Bond Index Fund

Derivative Financial Instruments Outstanding as of Period End

Futures Contracts

Description	Number of Contracts		Expiration Date		Notional Amount (000)		Value/  Unrealized  Appreciation  (Depreciation)
Long Contracts
Ultra U.S. Treasury Bond		1		03/19/24	$	129	$	6,997

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of financial instruments. These inputs to valuation techniques are categorized into a fair value hierarchy consisting of three broad levels for financial reporting purposes as follows:

• Level 1 – Unadjusted price quotations in active markets/exchanges for identical assets or liabilities that the Fund has the ability to access;

• Level 2 – Other observable inputs (including, but not limited to, quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market–corroborated inputs); and

• Level 3 – Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the Valuation Committee’s assumptions used in determining the fair value of financial instruments).

The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments classified within Level 3 have significant unobservable inputs used by the Valuation Committee in determining the price for Fair Valued Investments. Level 3 investments include equity or debt issued by privately held companies or funds. There may not be a secondary market, and/or there are a limited number of investors. The categorization of a value determined for financial instruments is based on the pricing transparency of the financial instruments and is not necessarily an indication of the risks associated with investing in those securities. For information about the Fund’s policy regarding valuation of financial instruments, refer to its most recent financial statements.

The following table summarizes the Fund’s financial instruments categorized in the fair value hierarchy. The breakdown of the Fund’s financial instruments into major categories is disclosed in the Schedule of Investments above.

	Level 1			Level 2			Level 3			Total
Assets
Investments
Long-Term Investments
U.S. Government Sponsored Agency Securities	$	—		$	24,414,782		$	—		$	24,414,782
U.S. Treasury Obligations		—			2,331,795,499			—			2,331,795,499
Short-Term Securities
Money Market Funds		869,913,213			—			—			869,913,213
	$	869,913,213		$	2,356,210,281		$	—		$	3,226,123,494
Derivative Financial Instruments(a)
Assets
Interest Rate Contracts	$	6,997		$	—		$	—		$	6,997

^(a)  Derivative financial instruments are futures contracts. Futures contracts are valued at the unrealized appreciation (depreciation) on the instrument.

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