Schedule of Investments  (unaudited) October 31, 2021 BlackRock Future Tech ETF (Percentages shown are based on Net Assets)

Security	Shares		Value
Common Stocks
Automobiles — 3.1%
Arrival SA(a)(b)		3,948	$	65,261
Tesla Inc.(a)		441		491,274
				556,535
Capital Markets — 0.3%
Coinbase Global Inc., Class A(a)		140		44,719
Diversified Consumer Services — 1.3%
Chegg Inc.(a)(b)		2,130		126,607
Duolingo Inc.(a)		186		32,307
Udemy Inc., NVS		2,526		69,465
				228,379
Electrical Equipment — 0.6%
Fluence Energy Inc.(a)		3,242		115,318
Electronic Equipment, Instruments & Components — 2.9%
Cognex Corp.		1,609		140,932
Maxscend Microelectronics Co. Ltd., Class A		1,800		86,903
Samsung SDI Co. Ltd.		457		288,334
				516,169
Entertainment — 2.4%
HYBE Co. Ltd.(a)		312		89,631
Roku Inc.(a)		619		188,733
Take-Two Interactive Software Inc.(a)		795		143,895
				422,259
Health Care Providers & Services — 0.5%
Agilon Health Inc.(a)		3,972		97,314
Health Care Technology — 0.8%
Definitive Healthcare Corp.(a)(b)		1,920		77,069
Doximity Inc., Class A(a)(b)		971		67,465
				144,534
Interactive Media & Services — 6.1%
Acast AB(a)(b)		14,555		39,184
Bumble Inc., Class A(a)		1,669		87,656
Eventbrite Inc., Class A(a)		5,415		109,600
Kakao Corp.		3,134		337,169
Kanzhun Ltd.(a)		1,839		64,549
Snap Inc., Class A, NVS(a)		4,307		226,462
ZoomInfo Technologies Inc., Class A(a)		3,375		226,867
				1,091,487
Internet & Direct Marketing Retail — 4.7%
Cazoo Group Ltd., NVS(a)		14,148		131,576
Delivery Hero SE(a)(c)		1,183		147,550
Farfetch Ltd., Class A(a)(b)		4,241		166,289
MercadoLibre Inc.(a)		134		198,457
Ozon Holdings PLC, ADR(a)		4,407		198,315
				842,187
IT Services — 16.4%
Adyen NV(a)(c)		64		193,108
Affirm Holdings Inc.(a)		1,161		188,663
Cloudflare Inc., Class A(a)		1,493		290,717
Dlocal Ltd./Uruguay(a)(b)		2,339		113,465
Endava PLC, ADR(a)		1,798		284,911
GMO Payment Gateway Inc.		1,100		139,366
Grid Dynamics Holdings Inc.(a)		5,279		151,771
Locaweb Servicos de Internet SA(c)		47,744		154,810
MongoDB Inc.(a)		552		287,752
Okta Inc.(a)		853		210,845

Security	Shares		Value
IT Services (continued)
Pagseguro Digital Ltd., Class A(a)(b)		3,305	$	119,641
Paymentus Holdings Inc., Class A(a)		2,450		62,720
Shift4 Payments Inc., Class A(a)(b)		3,233		204,099
Square Inc., Class A(a)		1,225		311,762
Twilio Inc., Class A(a)		753		219,394
				2,933,024
Machinery — 0.3%
Berkshire Grey Inc., Class A(a)		8,819		60,851
Professional Services — 2.2%
CoStar Group Inc.(a)		1,627		140,003
Legalzoomcom Inc.(a)		3,754		105,262
TransUnion		1,367		157,602
				402,867
Road & Rail — 0.7%
Lyft Inc., Class A(a)		2,929		134,353
Semiconductors & Semiconductor Equipment — 26.6%
Alphawave IP Group PLC(a)		21,609		58,969
Ambarella Inc.(a)		1,255		233,217
Andes Technology Corp.		7,000		127,335
ASM International NV		577		261,141
BE Semiconductor Industries NV		2,343		214,070
Enphase Energy Inc.(a)		748		173,259
Entegris Inc.		1,917		269,875
KLA Corp.		424		158,050
Lasertec Corp.		1,400		303,682
Lattice Semiconductor Corp.(a)		4,131		286,857
MACOM Technology Solutions Holdings Inc., Class H(a)(b)		2,594		181,113
Marvell Technology Inc.		5,873		402,300
Monolithic Power Systems Inc.		531		279,019
Nordic Semiconductor ASA(a)		5,534		164,416
ON Semiconductor Corp.(a)		4,681		225,016
Qorvo Inc.(a)		854		143,668
Silergy Corp.		2,000		330,410
SkyWater Technology Inc.(a)		3,078		105,391
SOITEC(a)		995		264,920
Tower Semiconductor Ltd.(a)(b)		3,720		118,556
Ultra Clean Holdings Inc.(a)		4,387		217,464
Wolfspeed Inc.(a)		2,088		250,790
				4,769,518
Software — 26.5%
Alkami Technology Inc.(a)		1,993		59,790
Altium Ltd.		6,253		174,188
AppLovin Corp., Class A(a)		1,928		189,426
Atlassian Corp. PLC, Class A(a)		701		321,149
Avalara Inc.(a)		1,108		199,041
AvidXchange Holdings Inc., NVS(a)		3,241		72,048
Bill.com Holdings Inc.(a)		485		142,740
Confluent Inc., Class A(a)		1,610		109,400
Coupa Software Inc.(a)		589		134,115
Crowdstrike Holdings Inc., Class A(a)		878		247,420
CS Disco Inc.(a)		2,971		170,387
Dolby Laboratories Inc., Class A		1,366		120,686
Elastic NV(a)		1,127		195,546
EngageSmart Inc.(a)		1,796		60,220
Freee KK(a)		2,100		150,729
Glodon Co. Ltd., Class A		11,871		137,625
Latch Inc.(a)		9,851		87,575
Lightspeed Commerce Inc.(a)		4,139		403,432

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Schedule of Investments  (unaudited) (continued) October 31, 2021 BlackRock Future Tech ETF (Percentages shown are based on Net Assets)

Security	Shares		Value
Software (continued)
Ming Yuan Cloud Group Holdings Ltd.		34,000	$	110,517
Plaid Inc.(a)(b)		2,700		68,877
Procore Technologies Inc.(a)		683		62,460
Rakus Co. Ltd.		7,500		237,708
Siteminder Ltd., NVS(a)(d)		58,056		220,984
Synopsys Inc.(a)		745		248,219
Trade Desk Inc. (The), Class A(a)		1,780		133,340
Unity Software Inc.(a)(b)		1,562		236,346
Xero Ltd.(a)		1,738		198,172
Zscaler Inc.(a)		820		261,465
				4,753,605
Technology Hardware, Storage & Peripherals — 0.7%
Pure Storage Inc., Class A(a)		4,441		119,285
Total Common Stocks — 96.1% (Cost: $13,884,513)				17,232,404
Short-Term Investments
Money Market Funds — 15.0%
BlackRock Cash Funds: Institutional, SL Agency Shares, 0.05%(e)(f)(g)		1,590,166		1,590,961
BlackRock Cash Funds: Treasury, SL Agency Shares, 0.00%(e)(f)		1,100,000		1,100,000
				2,690,961
Total Short-Term Investments — 15.0% (Cost: $2,690,961)				2,690,961
Total Investments in Securities — 111.1% (Cost: $16,575,474)				19,923,365
Other Assets, Less Liabilities — (11.1)%				(1,989,056	)
Net Assets — 100.0%			$	17,934,309

^(a)  Non-income producing security.

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

^(c)  Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration to qualified institutional investors.

^(d)  Security is valued using significant unobservable inputs and is classified as Level 3 in the fair value hierarchy.

^(e)  Affiliate of the Fund.

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

^(g)  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 October 31, 2021 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 07/31/21		Purchases at Cost			Proceeds from Sales			Net Realized Gain (Loss)		Change in Unrealized Appreciation (Depreciation)		Value at 10/31/21		Shares Held at 10/31/21		Income			Capital Gain Distributions from Underlying Funds
BlackRock Cash Funds: Institutional, SL Agency Shares		$2,980,120		$        —		$	(1,389,159	)(a)	$	—	$	—	$	1,590,961		1,590,166	$	8,875	(b)	$	—
BlackRock Cash Funds: Treasury, SL Agency Shares		870,000		230,000	(a)		—			—		—		1,100,000		1,100,000		10			—
									$	—	$	—	$	2,690,961			$	8,885		$	—

^(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.

Fair Value Measurements

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 each Fund has the ability to access;

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Schedule of Investments  (unaudited) (continued) October 31, 2021 BlackRock Future Tech ETF

    Fair Value Measurements (continued)

• 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 BlackRock Global Valuation Methodologies Committee’s (the “Global 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 Global 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
Investments
Assets
Common Stocks	$	12,985,569	$	4,025,851	$	220,984	$	17,232,404
Money Market Funds		2,690,961		—		—		2,690,961
	$	15,676,530	$	4,025,851	$	220,984	$	19,923,365

The following table includes a rollforward for the period ended October 31, 2021 of investments whose values are classified as Level 3 as of the beginning or end of the period .

	Common Stocks
Opening balance, as of 10/31/2021(a)		$	—
Transfers into Level 3			—
Transfers out of Level 3			—
Other			—
Accrued discounts/premiums			—
Net realized gain (loss)			—
Net change in unrealized appreciation (depreciation)			1,557
Purchases			219,427
Sales			—
Closing balance, as of 10/31/2021		$	220,984
Net change in unrealized appreciation/depreciation on investments still held at end of period		$	1,557

^(a)  Commencement of operations.

The Fund’s investments that are categorized as Level 3 were valued utilizing a single broker quote without adjustment. Such valuations are based on unobservable inputs. A significant change in third party information could result in a significantly lower or higher value of such Level 3 investments.

Portfolio Abbreviations - Equity
ADR	American Depositary Receipt
NVS	Non-Voting Shares

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