ACMR

insider transactions

ACM Research, Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

Net shares · 90d

-128.8K

0 buy · 128.8K sell

Net value · 90d

-$11.0M

$0 in · $11.0M out

Sentiment · 90d

Net selling

0% buying · 100% selling

Open-market trades · 90d

0 buy · 128.8K sell

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Exercise·M
Jun 5, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$0

5.4K sh

Own +17%
Sell·S
Jun 5, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$140.7K

1.6K sh · $85.41

Own -2%
Sell·S
Jun 5, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$33.6K

400 sh · $84.01

Own -0%
Sell·S
Jun 5, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$80.0K

968 sh · $82.61

Own -1%
Sell·S
Jun 5, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$194.8K

2.4K sh · $81.73

Own -2%
Exercise·M
Jun 5, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$75.0K

5.4K sh · $13.89

Own +5%
Exercise·M
Jun 4, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$0

13.4K sh

Own +45%
Sell·S
Jun 4, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$243.5K

2.8K sh · $85.77

Own -3%
Sell·S
Jun 4, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$784.0K

9.2K sh · $85.11

Own -8%
Sell·S
Jun 4, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$109.3K

1.3K sh · $84.08

Own -1%
Exercise·M
Jun 4, 26

Sotheara Cheav KEY

Senior Vice President, Manufa… · 10b5-1

$185.4K

13.4K sh · $13.89

Own +13%
Exercise·M
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$0

40.0K sh

Own +17%
Sell·S
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$72.6K

826 sh · $87.91

Own -0%
Sell·S
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$747.7K

8.6K sh · $87.13

Own -1%
Sell·S
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$946.1K

11.0K sh · $86.07

Own -1%
Sell·S
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$1.5M

17.5K sh · $85.11

Own -2%
Sell·S
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$172.8K

2.1K sh · $83.86

Own -0%
Exercise·M
Jun 4, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$40.0K

40.0K sh · $1.00

Own +5%
Exercise·M
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$0

60.0K sh

Own +24%
Sell·S
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$110.4K

1.2K sh · $93.04

Own -0%
Sell·S
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$539.8K

5.8K sh · $92.38

Own -1%
Sell·S
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$901.0K

9.9K sh · $90.78

Own -1%
Sell·S
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$2.9M

32.5K sh · $89.84

Own -4%
Sell·S
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$560.1K

6.3K sh · $88.98

Own -1%
Sell·S
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$376.6K

4.3K sh · $87.57

Own -0%
Exercise·M
Jun 3, 26

David H Wang KEY

Chief Executive Officer, Pres… · 10b5-1

$60.0K

60.0K sh · $1.00

Own +7%
Exercise·M
May 19, 26

Haiping Dun

Director · 10b5-1

$0

5.0K sh

Own +11%
Sell·S
May 19, 26

Haiping Dun

Director · 10b5-1

$125.5K

1.9K sh · $67.54

Own -100%
Sell·S
May 19, 26

Haiping Dun

Director · 10b5-1

$88.0K

1.3K sh · $67.21

Own -41%
Sell·S
May 19, 26

Haiping Dun

Director · 10b5-1

$32.5K

500 sh · $65.09

Own -14%
Sell·S
May 19, 26

Haiping Dun

Director · 10b5-1

$85.1K

1.3K sh · $63.84

Own -27%
Exercise·M
May 19, 26

Haiping Dun

Director · 10b5-1

$28.0K

5.0K sh · $5.60

Own New
Exercise·M
Apr 17, 26

Charles C Pappis

Director · 10b5-1

$0

5.0K sh

Own New
Sell·S
Apr 17, 26

Charles C Pappis

Director · 10b5-1

$260.0K

5.0K sh · $52.00

Own -100%
Exercise·M
Apr 17, 26

Charles C Pappis

Director · 10b5-1

$145.9K

5.0K sh · $29.18

Own New

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 5, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Exercise M	5.4K	+17%	—	$0
Jun 5, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	1.6K	-2%	$85.41	$140.7K
Jun 5, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	400	-0%	$84.01	$33.6K
Jun 5, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	968	-1%	$82.61	$80.0K
Jun 5, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	2.4K	-2%	$81.73	$194.8K
Jun 5, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Exercise M	5.4K	+5%	$13.89	$75.0K
Jun 4, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Exercise M	13.4K	+45%	—	$0
Jun 4, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	2.8K	-3%	$85.77	$243.5K
Jun 4, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	9.2K	-8%	$85.11	$784.0K
Jun 4, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Sell S	1.3K	-1%	$84.08	$109.3K
Jun 4, 2026	Sotheara Cheav KEY 10b5-1	Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.	Exercise M	13.4K	+13%	$13.89	$185.4K
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Exercise M	40.0K	+17%	—	$0
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	826	-0%	$87.91	$72.6K
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	8.6K	-1%	$87.13	$747.7K
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	11.0K	-1%	$86.07	$946.1K
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	17.5K	-2%	$85.11	$1.5M
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	2.1K	-0%	$83.86	$172.8K
Jun 4, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Exercise M	40.0K	+5%	$1.00	$40.0K
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Exercise M	60.0K	+24%	—	$0
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	1.2K	-0%	$93.04	$110.4K
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	5.8K	-1%	$92.38	$539.8K
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	9.9K	-1%	$90.78	$901.0K
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	32.5K	-4%	$89.84	$2.9M
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	6.3K	-1%	$88.98	$560.1K
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Sell S	4.3K	-0%	$87.57	$376.6K
Jun 3, 2026	David H Wang KEY 10b5-1	Chief Executive Officer, President and Director	Exercise M	60.0K	+7%	$1.00	$60.0K
May 19, 2026	Haiping Dun 10b5-1	Director	Exercise M	5.0K	+11%	—	$0
May 19, 2026	Haiping Dun 10b5-1	Director	Sell S	1.9K	-100%	$67.54	$125.5K
May 19, 2026	Haiping Dun 10b5-1	Director	Sell S	1.3K	-41%	$67.21	$88.0K
May 19, 2026	Haiping Dun 10b5-1	Director	Sell S	500	-14%	$65.09	$32.5K
May 19, 2026	Haiping Dun 10b5-1	Director	Sell S	1.3K	-27%	$63.84	$85.1K
May 19, 2026	Haiping Dun 10b5-1	Director	Exercise M	5.0K	New	$5.60	$28.0K
Apr 17, 2026	Charles C Pappis 10b5-1	Director	Exercise M	5.0K	New	—	$0
Apr 17, 2026	Charles C Pappis 10b5-1	Director	Sell S	5.0K	-100%	$52.00	$260.0K
Apr 17, 2026	Charles C Pappis 10b5-1	Director	Exercise M	5.0K	New	$29.18	$145.9K

About ACMR insider trading

This page tracks insider transactions for ACM Research, Inc. (ACMR) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.