BlackRock Discloses 1,000,000 Shares (33%) of iShares Prime MMF

BlackRock Portfolio Management LLC reports beneficial ownership of 1,000,000 shares of iShares Prime Money Market ETF common stock, representing 33.0% of the class.

Accepted by SEC EDGAR 09/05/2025 - 12:05 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

BlackRock Portfolio Management LLC reports beneficial ownership of 1,000,000 shares of iShares Prime Money Market ETF common stock, representing 33.0% of the class. The filing (Schedule 13G, Amendment No. 5) shows BlackRock has sole dispositive power over 1,000,000 shares and reports no sole or shared voting power for those shares.

The statement clarifies this reporting reflects certain BlackRock business units and notes that BlackRock Financial Management - MMF holds an interest in the common stock exceeding 5% of the outstanding class. The filing includes standard certifications and exhibits for power of attorney and Item 7 identification.

Positive

• Material disclosure of beneficial ownership: 1,000,000 shares reported, providing transparency to investors
• Clear dispositive control: Sole dispositive power over 1,000,000 shares is explicitly stated
• Affiliated entity disclosure: Identification that BlackRock Financial Management - MMF holds >5% aids investor understanding

Negative

• No voting power reported for the disclosed shares, which may limit direct governance influence
• Concentration risk: 33.0% of the class held by one reporting entity is large and could be material to class dynamics

Insights

Securities Analyst

TL;DR: Large passive ownership disclosed: 1,000,000 shares (33.0%), dispositive control without voting power noted.

The filing discloses a substantial beneficial stake by BlackRock Portfolio Management LLC in iShares Prime Money Market ETF, equal to one-third of the class. The position is reported as dispositive rather than voting, suggesting voting rights are either delegated, retained by another entity, or structured through the fund. This is a material disclosure for shareholders and regulators because a 33% beneficial interest is sizable relative to the class and must be tracked for governance and regulatory reporting purposes.

Corporate Governance Expert

TL;DR: Material ownership disclosed, but absence of voting power changes governance implications.

The report highlights that BlackRock has sole power to dispose of 1,000,000 shares but reports zero voting power. From a governance perspective, dispositive control without voting rights limits direct influence on shareholder votes while still indicating economic exposure. The filing also identifies a related BlackRock entity (BlackRock Financial Management - MMF) with >5% interest, which is relevant to understanding how stewardship responsibilities and voting authority may be allocated across affiliated entities.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many iShares Prime Money Market ETF (CUSIP 09290C756) shares does BlackRock Portfolio Management LLC report owning?

The filing reports 1,000,000 shares beneficially owned by BlackRock Portfolio Management LLC.

What percentage of the class does BlackRock Portfolio Management LLC hold in the iShares Prime Money Market ETF?

The filing states BlackRock Portfolio Management LLC holds 33.0% of the class.

Does BlackRock Portfolio Management LLC have voting power over the shares reported?

No. The report shows 0 sole voting power and 0 shared voting power for the reported shares.

What control does BlackRock have over the reported shares?

BlackRock Portfolio Management LLC reports sole dispositive power to dispose of or direct disposition of 1,000,000 shares.

Is any related BlackRock entity also disclosed as holding more than 5%?

Yes. The filing notes BlackRock Financial Management - MMF has an interest in the common stock that is more than 5% of the total outstanding class.

When was this Schedule 13G signed by BlackRock Portfolio Management LLC?

The signature on the filing is dated 09/05/2025, and the date of the event requiring the filing is 08/31/2025.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

iShares Prime Money Market ETF

(Name of Issuer)

Common Stock

(Title of Class of Securities)

09290C756

(CUSIP Number)

08/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 09290C756

1

Names of Reporting Persons

BlackRock Portfolio Management LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,000,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,000,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

33.0 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: iShares Prime Money Market ETF
(b)	Address of issuer's principal executive offices: 100 BELLEVUE PARKWAY WILMINGTON DE 19809
Item 2.
(a)	Name of person filing: BlackRock Portfolio Management LLC In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock Portfolio Management LLC, 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 09290C756
Item 4.	Ownership
(a)	Amount beneficially owned: 1000000
(b)	Percent of class: 33.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1000000
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The interest of 1 such person, BlackRock Financial Management - MMF, in the common stock of iShares Prime Money Market ETF is more than five percent of the total outstanding common stock.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BlackRock Portfolio Management LLC

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	09/05/2025

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7