Insider Transactions Reported by 13 Insiders of ACM Research, Inc.

Symbol
ACMR on Nasdaq
Location
Fremont, CA

Quick Takeaways

  • ACMR - ACM Research, Inc. has 13 insiders with reported activity on this page.
  • Net insider value flow over the last year: -$37,035,782.
  • Recent transaction rows are available for direct filing-level review.

What Changed

  • Buy value: ; sell value: $37,035,781.
  • Net share flow: -1,065,953.

Why This Matters

  • This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
  • Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Source Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to selling over the last 12 months. Net value: -$37,035,782.

Buys

$0

Shares: 0

Insiders: 0

Sells

$37,035,782

Shares: 1,065,953

Insiders: 9

Net

-$37,035,782

Shares: -1,065,953

Insiders: -9

Window (months) Buy shares Sell shares Buy $ Sell $ Net $
0-3 0 308,551 $0 $14,406,242 -$14,406,242
3-6 0 311,250 $0 $10,432,090 -$10,432,090
6-9 0 256,152 $0 $7,549,347 -$7,549,347
9-12 0 190,000 $0 $4,648,104 -$4,648,104

ACM Research, Inc. executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Shanghai Science & Technology Venture Capital (Group) Co., Ltd. Possible member of 10% group, 10%+ Owner $120,382,639 Mixed 04 Oct 2024
David H. Wang Chief Executive Officer, President and Director, Director, 10%+ Owner $88,826,347 -$15,985,472 -15% Mixed 11 Mar 2026
Xiao Xing Director $49,412,716 Filing P/S 04 Oct 2024
Haiping Dun Director $46,508,345 -$217,363 -0.47% Mixed 09 Mar 2026
Yinan Xiang Director $25,215,740 Mixed 23 Aug 2021
Jian Wang Chief Executive Officer and President of ACM Research (Shanghai), Inc., a subsidiary of the Issuer $8,860,530 -$2,910,000 -25% Filing P/S 18 Sep 2025
Tracy Liu Director $5,344,749 -$3,795,782 -42% Filing P/S 10 Mar 2026
Sotheara Cheav Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer. $3,500,070 -$684,560 -16% Filing P/S 18 Sep 2025
Chenming Hu Director $3,000,060 Filing P/S 17 Mar 2025
Lisa Feng Chief Financial Officer of ACM Research (Shanghai), Inc., a subsidiary of the Issuer $2,329,046 -$3,249,241 -58% Filing P/S 05 Mar 2026
Mark McKechnie Chief Financial Officer and Treasurer $41,913 -$5,961,759 -99% Filing P/S 12 Mar 2026
Fuping Chen Vice President, Sales-China of ACM Research (Shanghai), Inc., a subsidiary of the Issuer $0 -$3,981,156 -100% Mixed 02 Dec 2025
Charles C. Pappis Director $0 -$250,450 -100% Mixed 05 Mar 2026

Top shareholders of ACM Research, Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Holder Source Role / Reporting Ownership % Shares Holdings Value 12M Net Δ As of Details
BlackRock, Inc.
13F 13D/G
Company
13%
from 13D/G
7,888,480
 $311,200,536 — 31 Dec 2025
13F 13D/G
VANGUARD GROUP INC
13F
Company
8.3%
4,972,103
 $196,149,463 — 31 Dec 2025
13F
Shanghai Science & Technology Venture Capital (Group) Co., Ltd.
3/4/5
Possible member of 10% group, 10%+ Owner —
class O/S missing
5,697,238
 $120,382,639 — 04 Oct 2024
3/4/5
LSV ASSET MANAGEMENT
13F
Company
4%
2,380,521
 $93,912,000 — 31 Dec 2025
13F
David H. Wang
3/4/5
Chief Executive Officer, President and Director, Director, 10%+ Owner —
mixed-class rows
2,118,550
mixed-class rows
 $88,826,347 -$15,985,472 11 Mar 2026
3/4/5
STATE STREET CORP
13F
Company
3.3%
1,958,041
 $77,244,717 — 31 Dec 2025
13F
Triata Capital Ltd
13F
Company
3.2%
1,929,919
 $76,135,305 — 31 Dec 2025
13F
SOUTHEASTERN ASSET MANAGEMENT INC/TN/
13F
Company
2.8%
1,680,181
 $66,283,140 — 31 Dec 2025
13F
MORGAN STANLEY
13F
Company
2.3%
1,392,306
 $54,926,494 — 31 Dec 2025
13F
GEODE CAPITAL MANAGEMENT, LLC
13F
Company
2.2%
1,342,899
 $52,986,097 — 31 Dec 2025
13F
Invesco Ltd.
13F
Company
2.2%
1,342,136
 $52,947,265 — 31 Dec 2025
13F
Xiao Xing
3/4/5
Director —
class O/S missing
2,338,510
 $49,412,716 — 04 Oct 2024
3/4/5
Haiping Dun
3/4/5
Director —
mixed-class rows
910,090
mixed-class rows
 $46,508,345 -$217,363 09 Mar 2026
3/4/5
JANUS HENDERSON GROUP PLC
13F
Company
1.8%
1,082,982
 $42,739,885 — 31 Dec 2025
13F
Mitsubishi UFJ Trust & Banking Corp
13F
Company
1.4%
829,127
 $32,721,497 — 31 Dec 2025
13F
FMR LLC
13F
Company
1.3%
803,666
 $31,704,614 — 31 Dec 2025
13F
Tekne Capital Management, LLC
13F
Company
1.2%
715,000
 $28,206,750 — 31 Dec 2025
13F
Cederberg Capital Ltd
13F
Company
1.2%
693,900
 $27,374,000 — 31 Dec 2025
13F
Broad Bay Capital Management, LP
13F
Company
1.1%
652,214
 $25,729,842 — 31 Dec 2025
13F
Yinan Xiang
3/4/5
Director —
class O/S missing
1,146,170
 $25,215,740 — 23 Aug 2021
3/4/5
NORTHERN TRUST CORP
13F
Company
0.91%
544,059
 $21,463,127 — 31 Dec 2025
13F
UBS Group AG
13F
Company
0.85%
510,315
 $20,131,927 — 31 Dec 2025
13F
Steamboat Capital Partners, LLC
13F
Company
0.84%
504,161
 $19,889,151 — 31 Dec 2025
13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
Company
0.8%
478,333
 $18,870,237 — 31 Dec 2025
13F
Raiffeisen Bank International AG
13F
Company
0.73%
435,000
 $17,487,000 — 31 Dec 2025
13F
Penn Capital Management Company, LLC
13F
Company
0.73%
435,843
 $17,212,421 — 31 Dec 2025
13F
PRINCIPAL FINANCIAL GROUP INC
13F
Company
0.64%
383,129
 $15,114,440 — 31 Dec 2025
13F
GOLDMAN SACHS GROUP INC
13F
Company
0.6%
361,588
 $14,264,647 — 31 Dec 2025
13F
Yiheng Capital Management, L.P.
13D/G 13F
Yiheng Capital Partners, L.P. · Company
1.2%
666,304
 $14,145,634 $0 30 Sep 2024
13D/G 13F
Nearwater Capital Markets, Ltd
13F
Company
0.59%
350,800
 $13,839,060 — 31 Dec 2025
13F
AQR CAPITAL MANAGEMENT LLC
13F
Company
0.57%
343,603
 $13,555,139 — 31 Dec 2025
13F
WEXFORD CAPITAL LP
13F
Company
0.56%
335,003
 $13,215,870 — 31 Dec 2025
13F
Bank of New York Mellon Corp
13F
Company
0.54%
324,940
 $12,818,901 — 31 Dec 2025
13F
AMERIPRISE FINANCIAL INC
13F
Company
0.52%
313,167
 $12,359,082 — 31 Dec 2025
13F
NEW YORK STATE COMMON RETIREMENT FUND
13F
Company
0.51%
303,543
 $11,974,771 — 31 Dec 2025
13F
BANK OF AMERICA CORP /DE/
13F
Company
0.5%
301,712
 $11,902,538 — 31 Dec 2025
13F
DISCOVERY CAPITAL MANAGEMENT, LLC / CT
13F
Company
0.49%
296,200
 $11,685,090 — 31 Dec 2025
13F
CONGRESS ASSET MANAGEMENT CO
13F
Company
0.48%
289,449
 $11,418,763 — 31 Dec 2025
13F
Portolan Capital Management, LLC
13F
Company
0.48%
285,506
 $11,263,212 — 31 Dec 2025
13F
Cerity Partners LLC
13F
Company
0.45%
268,337
 $10,585,896 — 31 Dec 2025
13F
Kerrisdale Advisers, LLC
13F
Company
0.44%
263,482
 $10,394,365 — 31 Dec 2025
13F
Oasis Management Co Ltd.
13F
Company
0.39%
233,988
 $9,230,826 — 31 Dec 2025
13F
DIMENSIONAL FUND ADVISORS LP
13F
Company
0.39%
233,741
 $9,221,356 — 31 Dec 2025
13F
SG Americas Securities, LLC
13F
Company
0.38%
229,481
 $9,053,000 — 31 Dec 2025
13F
Jian Wang
3/4/5
Chief Executive Officer and President of ACM Research (Shanghai), Inc., a subsidiary of the Issuer
0.42%
253,158
 $8,860,530 -$2,910,000 18 Sep 2025
3/4/5
FIRST TRUST ADVISORS LP
13F
Company
0.36%
215,323
 $8,494,492 — 31 Dec 2025
13F
JPMORGAN CHASE & CO
13F
Company
0.33%
198,692
 $7,838,399 — 31 Dec 2025
13F
THOMPSON SIEGEL & WALMSLEY LLC
13F
Company
0.31%
188,500
 $7,436,000 — 31 Dec 2025
13F
MATTHEWS INTERNATIONAL CAPITAL MANAGEMENT LLC
13F
Company
0.31%
187,250
 $7,387,013 — 31 Dec 2025
13F
PUBLIC SECTOR PENSION INVESTMENT BOARD
13F
Company
0.31%
184,345
 $7,272,410 — 31 Dec 2025
13F

Recent Insider Transactions by Companies or Individuals for ACM Research, Inc.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
Mark McKechnie ACMR Class A Common Stock Sale -99.1% $4,491,952 $45.58 -98,551 900 12 Mar 2026 Direct
Mark McKechnie ACMR Class A Common Stock Options Exercise 98,551 60,900 12 Mar 2026 Direct
Mark McKechnie ACMR Stock Option Options Exercise -61.6% -98,551 61,449 12 Mar 2026 Direct
David H. Wang ACMR Class A Common Stock Sale -5.86% $2,278,923 $45.58 -50,000 802,708 12 Mar 2026 Direct
David H. Wang ACMR Class A Common Stock Options Exercise 6.23% 50,000 852,708 12 Mar 2026 Direct
David H. Wang ACMR Stock Option Options Exercise -11.9% -50,000 370,002 12 Mar 2026 Direct
David H. Wang ACMR Class A Common Stock Sale -6.95% $2,875,482 $47.92 -60,000 802,708 11 Mar 2026 Direct
David H. Wang ACMR Class A Common Stock Options Exercise 7.47% 60,000 862,708 11 Mar 2026 Direct
David H. Wang ACMR Stock Option Options Exercise -12.5% -60,000 420,002 11 Mar 2026 Direct
Tracy Liu ACMR Class A Common Stock Sale -11.9% $718,636 $47.91 -15,000 110,772 11 Mar 2026 Direct
Tracy Liu ACMR Class A Common Stock Options Exercise 13.5% 15,000 125,772 11 Mar 2026 Direct
Tracy Liu ACMR Stock Option Options Exercise -100% -15,000 0 11 Mar 2026 Direct
Tracy Liu ACMR Class A Common Stock Sale -28.9% $2,132,146 $47.38 -45,000 110,772 10 Mar 2026 Direct
Tracy Liu ACMR Class A Common Stock Options Exercise 40.6% 45,000 155,772 10 Mar 2026 Direct
Tracy Liu ACMR Stock Option Options Exercise -75% -45,000 15,000 10 Mar 2026 Direct
Haiping Dun ACMR Class A Common Stock Sale -100% $217,363 $43.47 -5,000 0 09 Mar 2026 Direct
Haiping Dun ACMR Class A Common Stock Options Exercise 5,000 5,000 09 Mar 2026 Direct
Haiping Dun ACMR Stock Option Options Exercise -8.33% -5,000 55,000 09 Mar 2026 Direct
Lisa Feng ACMR Class A Common Stock Sale -23.1% $691,152 $46.08 -15,000 50,001 06 Mar 2026 Direct
Lisa Feng ACMR Class A Common Stock Options Exercise 30% 15,000 65,001 06 Mar 2026 Direct
Lisa Feng ACMR Stock Option Options Exercise -100% -15,000 0 06 Mar 2026 Direct
Charles C. Pappis ACMR Class A Common Stock Sale -100% $250,450 $50.09 -5,000 0 05 Mar 2026 Direct
Charles C. Pappis ACMR Class A Common Stock Options Exercise 5,000 5,000 05 Mar 2026 Direct
Charles C. Pappis ACMR Stock Option Options Exercise -50% -5,000 5,000 05 Mar 2026 Direct
Lisa Feng ACMR Class A Common Stock Sale -23.1% $750,138 $50.01 -15,000 50,001 05 Mar 2026 Direct
Lisa Feng ACMR Class A Common Stock Options Exercise 30% 15,000 65,001 05 Mar 2026 Direct
Lisa Feng ACMR Stock Option Options Exercise -100% -15,000 0 05 Mar 2026 Direct
David H. Wang ACMR Stock Option Award 50% 545,400 1,636,197 04 Feb 2026 Direct
Mark McKechnie ACMR Class A Common Stock Sale -96.2% $797,625 $35.45 -22,500 900 08 Dec 2025 Direct
Mark McKechnie ACMR Class A Common Stock Options Exercise 2500% 22,500 23,400 08 Dec 2025 Direct
Mark McKechnie ACMR Stock Option Options Exercise -100% -22,500 0 08 Dec 2025 Direct
Mark McKechnie ACMR Class A Common Stock Sale -90.7% $293,882 $33.59 -8,750 900 04 Dec 2025 Direct
Mark McKechnie ACMR Class A Common Stock Options Exercise 972.2% 8,750 9,650 04 Dec 2025 Direct
Mark McKechnie ACMR Stock Option Options Exercise -100% -8,750 0 04 Dec 2025 Direct
David H. Wang ACMR Class A Common Stock Sale -6.95% $2,047,365 $34.12 -60,000 802,708 04 Dec 2025 Direct
David H. Wang ACMR Class A Common Stock Options Exercise 7.47% 60,000 862,708 04 Dec 2025 Direct
David H. Wang ACMR Stock Option Options Exercise -11.1% -60,000 480,002 04 Dec 2025 Direct
David H. Wang ACMR Class A Common Stock Sale -8.02% $2,314,112 $33.06 -70,000 802,708 03 Dec 2025 Direct
David H. Wang ACMR Class A Common Stock Options Exercise 8.72% 70,000 872,708 03 Dec 2025 Direct
David H. Wang ACMR Stock Option Options Exercise -11.5% -70,000 540,002 03 Dec 2025 Direct
Fuping Chen ACMR Class A Common Stock Sale -100% $661,156 $33.06 -20,000 0 03 Dec 2025 Direct
Fuping Chen ACMR Class A Common Stock Options Exercise 20,000 20,000 03 Dec 2025 Direct
Fuping Chen ACMR Stock Option Options Exercise -48.6% -20,000 21,165 03 Dec 2025 Direct
Fuping Chen ACMR Class A Common Stock Sale -100% $3,320,000 $33.20 -100,000 0 02 Dec 2025 Direct
Fuping Chen ACMR Class A Common Stock Options Exercise 100,000 100,000 02 Dec 2025 Direct
Fuping Chen ACMR Stock Option Options Exercise -70.8% -100,000 41,165 02 Dec 2025 Direct
Lisa Feng ACMR Class A Common Stock Sale -23.1% $506,550 $33.77 -15,000 50,001 13 Nov 2025 Direct
Lisa Feng ACMR Class A Common Stock Options Exercise 30% 15,000 65,001 13 Nov 2025 Direct
Lisa Feng ACMR Stock Option Options Exercise -100% -15,000 0 13 Nov 2025 Direct
Haiping Dun ACMR Class A Common Stock Gift -100% -755,090 0 12 Nov 2025 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.