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  4. [Form 4] ACM Research, Inc. Insider Trading Activity

ACM Research (NASDAQ: ACMR) director trades 60K shares under 10b5-1 plan

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

ACM Research, Inc. director Tracy Liu reported an exercise-and-sell transaction involving company stock. On March 10–11, 2026, Liu exercised stock options to acquire a total of 60,000 shares of Class A Common Stock at an exercise price of $1.00 per share. The same 60,000 shares were then sold in open-market transactions at weighted average prices within ranges from $46.67 to $48.50, under a pre-arranged Rule 10b5-1 trading plan adopted on December 4, 2025. After these transactions, Liu directly held 110,772 shares of Class A Common Stock.

Positive

  • None.

Negative

  • None.
Insider Liu Tracy
Role Director
Sold 60,000 shs ($2.85M)
Type Security Shares Price Value
Exercise Stock Option 15,000 $0.00 --
Exercise Class A Common Stock 15,000 $1.00 $15K
Sale Class A Common Stock 11,623 $47.81 $556K
Sale Class A Common Stock 3,377 $48.25 $163K
Exercise Stock Option 45,000 $0.00 --
Exercise Class A Common Stock 45,000 $1.00 $45K
Sale Class A Common Stock 32,216 $47.06 $1.52M
Sale Class A Common Stock 12,784 $48.19 $616K
Holdings After Transaction: Stock Option — 0 shares (Direct); Class A Common Stock — 125,772 shares (Direct)
Footnotes (1)
  1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 4, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.67 to $47.51, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), (4), and (5) to this Form 4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $47.70 to $48.50, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $47.13 to $48.12, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.13 to $48.44, inclusive. The option is fully vested and exercisable.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
 Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Liu Tracy
(Last) (First) (Middle)
C/O ACM RESEARCH, INC.
42307 OSGOOD ROAD, SUITE I
(Street)
FREMONT CA 94539
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
ACM Research, Inc. [ ACMR ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 03/10/2026 M 45,000 A $1 155,772 D
Class A Common Stock 03/10/2026 S(1) 32,216 D $47.06(2) 123,556 D
Class A Common Stock 03/10/2026 S(1) 12,784 D $48.19(3) 110,772 D
Class A Common Stock 03/11/2026 M 15,000 A $1 125,772 D
Class A Common Stock 03/11/2026 S(1) 11,623 D $47.81(4) 114,149 D
Class A Common Stock 03/11/2026 S(1) 3,377 D $48.25(5) 110,772 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option $1 03/10/2026 M 45,000 (6) 12/27/2026 Class A Common Stock 45,000 $0 15,000 D
Stock Option $1 03/11/2026 M 15,000 (6) 12/27/2026 Class A Common Stock 15,000 $0 0 D
Explanation of Responses:
1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 4, 2025.
2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.67 to $47.51, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), (4), and (5) to this Form 4.
3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $47.70 to $48.50, inclusive.
4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $47.13 to $48.12, inclusive.
5. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.13 to $48.44, inclusive.
6. The option is fully vested and exercisable.
/s/ Mark McKechnie, Attorney-in-Fact for Tracy Liu 03/12/2026
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Source: View Original Filing on SEC EDGAR

FAQ

What insider activity did ACM Research (ACMR) disclose for director Tracy Liu?

Director Tracy Liu exercised options for 60,000 ACM Research shares at $1.00 each, then sold 60,000 shares in open-market trades at weighted average prices between $46.67 and $48.50. Following these transactions, Liu directly held 110,772 ACM Research Class A shares.

How many ACMR shares did Tracy Liu sell and at what prices?

Tracy Liu sold 60,000 ACM Research Class A shares in multiple open-market transactions. The weighted average prices fell within ranges from $46.67 to $48.50 per share, reflecting several trades reported with different average sale prices across the two transaction dates.

Did Tracy Liu exercise stock options in this ACM Research (ACMR) Form 4?

Yes. Liu exercised stock options covering 60,000 shares of ACM Research Class A Common Stock at an exercise price of $1.00 per share. These option exercises converted derivative holdings into common shares before the subsequent open-market sales disclosed in the same report.

Were the ACMR stock sales by Tracy Liu made under a Rule 10b5-1 plan?

Yes. The sales were carried out under a Rule 10b5-1 trading plan adopted by Tracy Liu on December 4, 2025. Such pre-arranged plans schedule trades in advance, helping separate routine portfolio management from discretionary market-timing decisions by insiders.

How many ACM Research (ACMR) shares does Tracy Liu hold after these transactions?

After exercising options and selling 60,000 shares, Tracy Liu directly holds 110,772 shares of ACM Research Class A Common Stock. This figure reflects the position reported following the final transaction date in the sequence of option exercises and open-market sales.

What type of securities did Tracy Liu transact in ACM Research (ACMR)?

Liu transacted in both stock options and Class A Common Stock of ACM Research. The options, fully vested and exercisable, were exercised into 60,000 common shares, which were then sold through multiple open-market trades at weighted average prices in the high‑$40 range.