Acm Research Inc. (ACMR) Insider Trading

Last 12 months

Insiders sold $51.2M and bought nothing on the open market.

All of the selling was scheduled in advance under 10b5-1 plans. No executive or director has bought shares on the open market in the last two years.

Net open-market

−$51.2M

0 buys · 17 sales

Under a 10b5-1 plan

100%

of the value sold

Insiders who bought / sold

0 / 8

executives and directors

Last open-market buy

None

in the last two years

Get an email when ACMR's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Sep 8 – 9	David H Wang See Remarks	Sold10b5-1 plan 9 parts	140,000	$75.93 average	$10.6M	7.6%	Form 4
Aug 20	Mark McKechnie See Remarks	Sold10b5-1 plan 3 parts	55,199	$77.27 average	$4.26M	98%	Form 4
Aug 18	Haiping Dun Director	Sold10b5-1 plan 3 parts	5,000	$81.13 average	$406k	0.6%	Form 4
Jun 4 – 5	Sotheara Cheav See remarks	Sold10b5-1 plan 7 parts	18,750	$84.58 average	$1.59M	16%	Form 4
Jun 3 – 4	David H Wang See Remarks	Sold10b5-1 plan 11 parts	100,002	$88.35 average	$8.84M	5.4%	Form 4
May 19	Haiping Dun Director	Sold10b5-1 plan 4 parts	5,000	$66.22 average	$331k	0.6%	Form 4
Apr 17	Charles C Pappis Director	Sold10b5-1 plan	5,000	$52.00	$260k	100%	Form 4
Mar 12	Mark McKechnie See Remarks	Sold10b5-1 plan 6 parts	98,551	$45.58 average	$4.49M	99%	Form 4
Mar 11 – 12	David H Wang See Remarks	Sold10b5-1 plan 5 parts	110,000	$46.86 average	$5.15M	5.9%	Form 4
Mar 10 – 11	Tracy Liu Director	Sold10b5-1 plan 4 parts	60,000	$47.51 average	$2.85M	35%	Form 4
Mar 9	Haiping Dun Director	Sold10b5-1 plan 2 parts	5,000	$43.47 average	$217k	0.6%	Form 4
Mar 5 – 6	Lisa Feng See remarks	Sold10b5-1 plan 4 parts	30,000	$48.04 average	$1.44M	37%	Form 4
Mar 5	Charles C Pappis Director	Sold10b5-1 plan	5,000	$50.09	$250k	100%	Form 4
Dec 4, 2025 – Dec 8, 2025	Mark McKechnie See Remarks	Sold10b5-1 plan 3 parts	31,250	$34.93 average	$1.09M	97%	Form 4
Dec 3, 2025 – Dec 4, 2025	David H Wang See Remarks	Sold10b5-1 plan 4 parts	130,000	$33.55 average	$4.36M	6.9%	Form 4
Dec 2, 2025 – Dec 3, 2025	Fuping Chen See remarks	Sold10b5-1 plan 3 parts	120,000	$33.18 average	$3.98M	100%	Form 4
Nov 12, 2025 – Nov 13, 2025	Lisa Feng See remarks	Sold10b5-1 plan 2 parts	30,000	$33.27 average	$998k	37%	Form 4
Sep 18, 2025	Sotheara Cheav See remarks	Sold10b5-1 plan	10,000	$35.00	$350k	9.1%	Form 4
Sep 18, 2025	Jian Wang See remarks	Sold10b5-1 plan	30,000	$35.00	$1.05M	11%	Form 4
Sep 17, 2025	Tracy Liu Director	Sold10b5-1 plan	15,000	$33.00	$495k	12%	Form 4
Sep 3, 2025 – Sep 4, 2025	David H Wang See Remarks	Sold10b5-1 plan 3 parts	130,000	$26.61 average	$3.46M	7.4%	Form 4
Aug 22, 2025 – Aug 25, 2025	Jian Wang See remarks	Sold10b5-1 plan 2 parts	60,000	$31.00 average	$1.86M	19%	Form 4
Aug 22, 2025	Sotheara Cheav See remarks	Sold10b5-1 plan	11,152	$30.00	$335k	10%	Form 4
Jul 15, 2025	Tracy Liu Director	Sold10b5-1 plan	15,000	$30.00	$450k	12%	Form 4
Jul 7, 2025	Lisa Feng See remarks	Sold10b5-1 plan	15,000	$28.00	$420k	23%	Form 4
Jun 24, 2025	Lisa Feng See remarks	Sold10b5-1 plan	15,000	$26.00	$390k	23%	Form 4
May 21, 2025 – May 22, 2025	David H Wang See Remarks	Sold10b5-1 plan 3 parts	130,000	$23.15 average	$3.01M	7.4%	Form 4
May 14, 2025	Mark McKechnie See Remarks	Sold10b5-1 plan	15,000	$25.22	$378k	94%	Form 4
Mar 17, 2025	Chenming Hu Director	Sold10b5-1 plan	163,308	$30.00	$4.9M	62%	Form 4
Mar 14, 2025	Haiping Dun Director	Sold10b5-1 plan 2 parts	9,518	$29.00 average	$276k	1.1%	Form 4
Mar 11, 2025 – Mar 13, 2025	David H Wang See Remarks	Sold10b5-1 plan 4 parts	131,250	$27.02 average	$3.55M	7.5%	Form 4
Mar 12, 2025	Mark McKechnie See Remarks	Sold10b5-1 plan	15,000	$27.42	$411k	94%	Form 4
Mar 10, 2025	Haiping Dun Director	Sold10b5-1 plan	15,001	$26.54	$398k	1.7%	Form 4
Feb 6, 2025	Sotheara Cheav See remarks	Sold10b5-1 plan	22,598	$23.00	$520k	18%	Form 4
Feb 6, 2025	Mark McKechnie See Remarks	Sold10b5-1 plan	15,000	$22.00	$330k	94%	Form 4
Nov 29, 2024	Haiping Dun Director	Sold10b5-1 plan	19,058	$17.43	$332k	2.2%	Form 4
Nov 29, 2024	David H Wang See Remarks	Sold10b5-1 plan	56,250	$17.44	$981k	3.5%	Form 4
Nov 26, 2024	David H Wang See Remarks	Sold10b5-1 plan 2 parts	56,250	$17.89 average	$1.01M	3.4%	Form 4
Nov 22, 2024	Haiping Dun Director	Sold10b5-1 plan	15,000	$19.12	$287k	1.7%	Form 4
Nov 22, 2024	David H Wang See Remarks	Sold10b5-1 plan	56,250	$19.08	$1.07M	3.3%	Form 4

Sep 8 – 910b5-1 plan
David H Wang
See Remarks · sold 140,000 at avg $75.93
$10.6M
7.6% of stake
Aug 2010b5-1 plan
Mark McKechnie
See Remarks · sold 55,199 at avg $77.27
$4.26M
98% of stake
Aug 1810b5-1 plan
Haiping Dun
Director · sold 5,000 at avg $81.13
$406k
0.6% of stake
Jun 4 – 510b5-1 plan
Sotheara Cheav
See remarks · sold 18,750 at avg $84.58
$1.59M
16% of stake
Jun 3 – 410b5-1 plan
David H Wang
See Remarks · sold 100,002 at avg $88.35
$8.84M
5.4% of stake
May 1910b5-1 plan
Haiping Dun
Director · sold 5,000 at avg $66.22
$331k
0.6% of stake
Apr 1710b5-1 plan
Charles C Pappis
Director · sold 5,000 at $52.00
$260k
100% of stake
Mar 1210b5-1 plan
Mark McKechnie
See Remarks · sold 98,551 at avg $45.58
$4.49M
99% of stake
Mar 11 – 1210b5-1 plan
David H Wang
See Remarks · sold 110,000 at avg $46.86
$5.15M
5.9% of stake
Mar 10 – 1110b5-1 plan
Tracy Liu
Director · sold 60,000 at avg $47.51
$2.85M
35% of stake
Mar 910b5-1 plan
Haiping Dun
Director · sold 5,000 at avg $43.47
$217k
0.6% of stake
Mar 5 – 610b5-1 plan
Lisa Feng
See remarks · sold 30,000 at avg $48.04
$1.44M
37% of stake
Mar 510b5-1 plan
Charles C Pappis
Director · sold 5,000 at $50.09
$250k
100% of stake
Dec 4, 2025 – Dec 8, 202510b5-1 plan
Mark McKechnie
See Remarks · sold 31,250 at avg $34.93
$1.09M
97% of stake
Dec 3, 2025 – Dec 4, 202510b5-1 plan
David H Wang
See Remarks · sold 130,000 at avg $33.55
$4.36M
6.9% of stake
Dec 2, 2025 – Dec 3, 202510b5-1 plan
Fuping Chen
See remarks · sold 120,000 at avg $33.18
$3.98M
100% of stake
Nov 12, 2025 – Nov 13, 202510b5-1 plan
Lisa Feng
See remarks · sold 30,000 at avg $33.27
$998k
37% of stake
Sep 18, 202510b5-1 plan
Sotheara Cheav
See remarks · sold 10,000 at $35.00
$350k
9.1% of stake
Sep 18, 202510b5-1 plan
Jian Wang
See remarks · sold 30,000 at $35.00
$1.05M
11% of stake
Sep 17, 202510b5-1 plan
Tracy Liu
Director · sold 15,000 at $33.00
$495k
12% of stake
Sep 3, 2025 – Sep 4, 202510b5-1 plan
David H Wang
See Remarks · sold 130,000 at avg $26.61
$3.46M
7.4% of stake
Aug 22, 2025 – Aug 25, 202510b5-1 plan
Jian Wang
See remarks · sold 60,000 at avg $31.00
$1.86M
19% of stake
Aug 22, 202510b5-1 plan
Sotheara Cheav
See remarks · sold 11,152 at $30.00
$335k
10% of stake
Jul 15, 202510b5-1 plan
Tracy Liu
Director · sold 15,000 at $30.00
$450k
12% of stake
Jul 7, 202510b5-1 plan
Lisa Feng
See remarks · sold 15,000 at $28.00
$420k
23% of stake
Jun 24, 202510b5-1 plan
Lisa Feng
See remarks · sold 15,000 at $26.00
$390k
23% of stake
May 21, 2025 – May 22, 202510b5-1 plan
David H Wang
See Remarks · sold 130,000 at avg $23.15
$3.01M
7.4% of stake
May 14, 202510b5-1 plan
Mark McKechnie
See Remarks · sold 15,000 at $25.22
$378k
94% of stake
Mar 17, 202510b5-1 plan
Chenming Hu
Director · sold 163,308 at $30.00
$4.9M
62% of stake
Mar 14, 202510b5-1 plan
Haiping Dun
Director · sold 9,518 at avg $29.00
$276k
1.1% of stake
Mar 11, 2025 – Mar 13, 202510b5-1 plan
David H Wang
See Remarks · sold 131,250 at avg $27.02
$3.55M
7.5% of stake
Mar 12, 202510b5-1 plan
Mark McKechnie
See Remarks · sold 15,000 at $27.42
$411k
94% of stake
Mar 10, 202510b5-1 plan
Haiping Dun
Director · sold 15,001 at $26.54
$398k
1.7% of stake
Feb 6, 202510b5-1 plan
Sotheara Cheav
See remarks · sold 22,598 at $23.00
$520k
18% of stake
Feb 6, 202510b5-1 plan
Mark McKechnie
See Remarks · sold 15,000 at $22.00
$330k
94% of stake
Nov 29, 202410b5-1 plan
Haiping Dun
Director · sold 19,058 at $17.43
$332k
2.2% of stake
Nov 29, 202410b5-1 plan
David H Wang
See Remarks · sold 56,250 at $17.44
$981k
3.5% of stake
Nov 26, 202410b5-1 plan
David H Wang
See Remarks · sold 56,250 at avg $17.89
$1.01M
3.4% of stake
Nov 22, 202410b5-1 plan
Haiping Dun
Director · sold 15,000 at $19.12
$287k
1.7% of stake
Nov 22, 202410b5-1 plan
David H Wang
See Remarks · sold 56,250 at $19.08
$1.07M
3.3% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch ACMR, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in ACMR's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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