[SCHEDULE 13G/A] ACM Research, Inc. SEC Filing

Rhea-AI Filing Summary

BlackRock, Inc. reported beneficial ownership of 7,420,308 shares of ACM Research, Inc. Class A stock, representing 12.6% of the class. The report, filed as a Schedule 13G/A and signed on 10/02/2025, discloses sole voting power over 7,296,615 shares and sole dispositive power over 7,420,308 shares as of the 09/30/2025 event date. The filing notes that iShares Core S&P Small-Cap ETF holds more than 5% of ACMR common stock. The Schedule 13G states the shares were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.

Positive

• BlackRock, Inc. beneficially owns 7,420,308 shares of ACMR, equal to 12.6% of the Class A stock
• Filing classifies the position as passive (Schedule 13G/A) and states shares were acquired and held in the ordinary course of business

Negative

• None.

Insights

Institutional Ownership Analyst

Large passive stake: 7,420,308 shares (12.6%) held by BlackRock as of 09/30/2025.

BlackRock's filing shows an aggregate beneficial ownership of 7,420,308 shares, with sole voting power on 7,296,615 shares. This is a clear, quantifiable position that places BlackRock among the largest disclosed holders of ACMR Class A stock.

Because the filing is a Schedule 13G/A and includes the certification that holdings are in the ordinary course of business, the position is reported as passive under SEC rules and not intended to change control.

Corporate Governance Analyst

Passive holding with governance clarity; another fund exceeds 5%.

The filing explicitly states the stake is passive and not for control, which limits immediate governance implications. The disclosure of sole voting and dispositive powers quantifies BlackRock's influence on record.

The document also identifies iShares Core S&P Small-Cap ETF as a separate holder exceeding 5%, indicating at least two large holders above the 5% threshold.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

ACM Research, Inc.

(Name of Issuer)

Class A Stock

(Title of Class of Securities)

00108J109

(CUSIP Number)

09/30/2025

(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. 00108J109

1

Names of Reporting Persons

BlackRock, Inc.

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 7,296,615.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 7,420,308.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,420,308.00

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)

12.6 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ACM Research, Inc.
(b)	Address of issuer's principal executive offices: 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539
Item 2.
(a)	Name of person filing: BlackRock, Inc. 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, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Class A Stock
(e)	CUSIP No.: 00108J109
Item 4.	Ownership
(a)	Amount beneficially owned: 7420308
(b)	Percent of class: 12.6 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 7296615
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 7420308
	(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, iShares Core S&P Small-Cap ETF, in the common stock of ACM Research, Inc. 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, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	10/02/2025

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7

FAQ

How many ACM Research (ACMR) shares does BlackRock report owning?

BlackRock reports beneficial ownership of 7,420,308 shares, representing 12.6% of ACMR Class A stock.

What voting power does BlackRock have in the ACMR filing?

BlackRock reports sole voting power over 7,296,615 shares and sole dispositive power over 7,420,308 shares.

Is BlackRock’s stake in ACMR reported as active or passive?

The position is reported on a Schedule 13G/A with a certification that the shares are held in the ordinary course of business, indicating a passive reporting status.

Does any other holder own more than 5% of ACMR according to this filing?

Yes. The filing notes that iShares Core S&P Small-Cap ETF holds more than 5% of ACMR common stock.

What dates are cited in the Schedule 13G/A for ACMR?

The event date requiring filing is 09/30/2025 and the signature date on the filing is 10/02/2025.