Haiping Dun

CIK: 0001721581

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)15 (57.7%)

Position reduction

Option Exercises (M)5 (19.2%)

Derivative conversions

Awards (A)3 (11.5%)

Compensation grants

Other (G, F, J, C, D, …)3 (11.5%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

ACMR

ACM Research, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (26 total)

ACMR
ACM Research, Inc.
Aug 18, 2026
Exercise(M)
Direct
5K shares at avg. $5.60$28K
ACMR
ACM Research, Inc.
Aug 18, 2026
Sale(S)
Direct
400 shares at avg. $82.17$33K
ACMR
ACM Research, Inc.
Aug 18, 2026
Sale(S)
Direct
3.4K shares at avg. $81.31$276K
ACMR
ACM Research, Inc.
Aug 18, 2026
Sale(S)
Direct
1.2K shares at avg. $80.29$96K
ACMR
ACM Research, Inc.
Aug 12, 2026
Award(A)
Restricted Stock Units
Direct
728 shares-
ACMR
ACM Research, Inc.
Aug 12, 2026
Award(A)
Stock Option
Direct
6.4K shares-
ACMR
ACM Research, Inc.
May 19, 2026
Sale(S)
Direct
1.3K shares at avg. $63.84$85K
ACMR
ACM Research, Inc.
May 19, 2026
Sale(S)
Direct
500 shares at avg. $65.09$33K
ACMR
ACM Research, Inc.
May 19, 2026
Exercise(M)
Direct
5K shares at avg. $5.60$28K
ACMR
ACM Research, Inc.
May 19, 2026
Sale(S)
Direct
1.3K shares at avg. $67.21$88K
ACMR
ACM Research, Inc.
May 19, 2026
Sale(S)
Direct
1.9K shares at avg. $67.54$125K
ACMR
ACM Research, Inc.
Mar 9, 2026
Sale(S)
Direct
900 shares at avg. $43.94$40K
ACMR
ACM Research, Inc.
Mar 9, 2026
Sale(S)
Direct
4.1K shares at avg. $43.37$178K
ACMR
ACM Research, Inc.
Mar 9, 2026
Exercise(M)
Direct
5K shares at avg. $5.60$28K
ACMR
ACM Research, Inc.
Nov 12, 2025
Gift(G)
Direct
755.1K shares-
ACMR
ACM Research, Inc.
Aug 12, 2025
Award(A)
Stock Option
Direct
20K shares-
ACMR
ACM Research, Inc.
Mar 14, 2025
Sale(S)
Direct
2.5K shares at avg. $28.32$70K
ACMR
ACM Research, Inc.
Mar 14, 2025
Sale(S)
Direct
7.1K shares at avg. $29.23$206K
ACMR
ACM Research, Inc.
Mar 10, 2025
Sale(S)
Direct
15K shares at avg. $26.54$398K
ACMR
ACM Research, Inc.
Mar 3, 2025
Tax Payment(F)
Direct
482 shares at avg. $25.94$13K
ACMR
ACM Research, Inc.
Mar 3, 2025
Exercise(M)
Direct
25K shares at avg. $0.50$13K
ACMR
ACM Research, Inc.
Nov 29, 2024
Sale(S)
Direct
19.1K shares at avg. $17.43$332K
ACMR
ACM Research, Inc.
Nov 22, 2024
Sale(S)
Direct
15K shares at avg. $19.12$287K
ACMR
ACM Research, Inc.
Nov 14, 2024
Tax Payment(F)
Direct
942 shares at avg. $18.59$18K
ACMR
ACM Research, Inc.
Nov 14, 2024
Exercise(M)
Direct
35K shares at avg. $0.50$18K

		Type	Shares	Price		Ownership
Aug 18, 2026	ACMR ACM Research, Inc.	Exercise(M)	5,000	$5.60	$28,000	Direct
Aug 18, 2026	ACMR ACM Research, Inc.	Sale(S)	400	$82.17	$32,868	Direct
Aug 18, 2026	ACMR ACM Research, Inc.	Sale(S)	3,400	$81.31	$276,454	Direct
Aug 18, 2026	ACMR ACM Research, Inc.	Sale(S)	1,200	$80.29	$96,348	Direct
Aug 12, 2026	ACMR ACM Research, Inc.	Award(A) Restricted Stock Units	728	-	-	Direct
Aug 12, 2026	ACMR ACM Research, Inc.	Award(A) Stock Option	6,400	-	-	Direct
May 19, 2026	ACMR ACM Research, Inc.	Sale(S)	1,333	$63.84	$85,099	Direct
May 19, 2026	ACMR ACM Research, Inc.	Sale(S)	500	$65.09	$32,545	Direct
May 19, 2026	ACMR ACM Research, Inc.	Exercise(M)	5,000	$5.60	$28,000	Direct
May 19, 2026	ACMR ACM Research, Inc.	Sale(S)	1,309	$67.21	$87,978	Direct
May 19, 2026	ACMR ACM Research, Inc.	Sale(S)	1,858	$67.54	$125,489	Direct
Mar 9, 2026	ACMR ACM Research, Inc.	Sale(S)	900	$43.94	$39,546	Direct
Mar 9, 2026	ACMR ACM Research, Inc.	Sale(S)	4,100	$43.37	$177,817	Direct
Mar 9, 2026	ACMR ACM Research, Inc.	Exercise(M)	5,000	$5.60	$28,000	Direct
Nov 12, 2025	ACMR ACM Research, Inc.	Gift(G)	755,090	-	-	Direct
Aug 12, 2025	ACMR ACM Research, Inc.	Award(A) Stock Option	20,000	-	-	Direct
Mar 14, 2025	ACMR ACM Research, Inc.	Sale(S)	2,456	$28.32	$69,554	Direct
Mar 14, 2025	ACMR ACM Research, Inc.	Sale(S)	7,062	$29.23	$206,422	Direct
Mar 10, 2025	ACMR ACM Research, Inc.	Sale(S)	15,001	$26.54	$398,127	Direct
Mar 3, 2025	ACMR ACM Research, Inc.	Tax Payment(F)	482	$25.94	$12,503	Direct
Mar 3, 2025	ACMR ACM Research, Inc.	Exercise(M)	25,001	$0.50	$12,501	Direct
Nov 29, 2024	ACMR ACM Research, Inc.	Sale(S)	19,058	$17.43	$332,181	Direct
Nov 22, 2024	ACMR ACM Research, Inc.	Sale(S)	15,000	$19.12	$286,800	Direct
Nov 14, 2024	ACMR ACM Research, Inc.	Tax Payment(F)	942	$18.59	$17,512	Direct
Nov 14, 2024	ACMR ACM Research, Inc.	Exercise(M)	35,000	$0.50	$17,500	Direct

1-25 of 26 transactions

About Dun Haiping

Dun Haiping (SEC CIK 0001721581) files insider reports with the SEC as Director of ACM Research, Inc. (ACMR).

Signal8 holds 13 ownership filings by Dun Haiping, all Form 4s, filed between Sep 3, 2024 and Aug 26, 2026. Those filings report 26 transactions, from Aug 29, 2024 to Aug 18, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Dun Haiping's filings is in FREMONT, CA.

Recent filings by Dun Haiping

Aug 18, 2026: Option exercise of ACMR shares (Form 4, code M).
Aug 18, 2026: Open-market sales of ACMR shares (3 lines, Form 4, code S).
Aug 12, 2026: Grants or awards of ACMR derivative securities (2 lines, Form 4, code A).
May 19, 2026: Open-market sales of ACMR shares (2 lines, Form 4, code S).
May 19, 2026: Option exercise of ACMR shares (Form 4, code M).

Other insiders filing for ACM Research, Inc. (ACMR)

How to read Form 4 transaction codes