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Follow the people · Insider

DW

David H. Wang

Insider · Director and Officer and 10% owner · ACMR

David H. Wang files insider transactions with the SEC as a director and officer and 10% owner of ACM Research. We hold 6 disclosed purchases and sales filed since 3 July 2018, 2 of them in the last 90 days.

  • Files forACMR
  • Disclosed buys and sells6 in all, 2 in the last 90 days
  • Last disclosure10 September 2026

Positions held

1 post we hold — a term names its own dates; a run of filings only says when they filed
  • Filed 29 June 2018 — 9 September 2026Director and Officer and 10% owner · ACM Research 145 Form 4 lines · source: SEC Form 4

Every transaction

145 transactions from SEC Form 4 — one row each, sort any column, open a row for the filing
145 of 145 shown
9 Sep 202610 Sep 2026SEC Form 41 dsold on the open marketACM Research4,807 sharesdown −2.5%down −0.5%
9 Sep 202610 Sep 2026SEC Form 41 dsold on the open marketACM Research1,100 sharesdown −2.5%down −0.5%
9 Sep 202610 Sep 2026SEC Form 41 dexercised options overnot a tradeACM Researchderivative70,000 sharesdown −2.5%down −0.5%
9 Sep 202610 Sep 2026SEC Form 41 dexercised options overnot a tradeACM Research70,000 sharesdown −2.5%down −0.5%
9 Sep 202610 Sep 2026SEC Form 41 dsold on the open marketACM Research33,493 sharesdown −2.5%down −0.5%
9 Sep 202610 Sep 2026SEC Form 41 dsold on the open marketACM Research18,934 sharesdown −2.5%down −0.5%
9 Sep 202610 Sep 2026SEC Form 41 dsold on the open marketACM Research11,666 sharesdown −2.5%down −0.5%
8 Sep 202610 Sep 2026SEC Form 42 dexercised options overnot a tradeACM Research70,000 sharesdown −6.4%down −0.5%
8 Sep 202610 Sep 2026SEC Form 42 dexercised options overnot a tradeACM Researchderivative70,000 sharesdown −6.4%down −0.5%
8 Sep 202610 Sep 2026SEC Form 42 dsold on the open marketACM Research4,803 sharesdown −6.4%down −0.5%
8 Sep 202610 Sep 2026SEC Form 42 dsold on the open marketACM Research51,374 sharesdown −6.4%down −0.5%
8 Sep 202610 Sep 2026SEC Form 42 dsold on the open marketACM Research12,323 sharesdown −6.4%down −0.5%
8 Sep 202610 Sep 2026SEC Form 42 dsold on the open marketACM Research1,500 sharesdown −6.4%down −0.5%
4 Jun 20265 Jun 2026SEC Form 41 dsold on the open marketACM Research17,543 sharesdown −20.2%down −5.6%
4 Jun 20265 Jun 2026SEC Form 41 dsold on the open marketACM Research10,992 sharesdown −20.2%down −5.6%
4 Jun 20265 Jun 2026SEC Form 41 dsold on the open marketACM Research8,581 sharesdown −20.2%down −5.6%
4 Jun 20265 Jun 2026SEC Form 41 dsold on the open marketACM Research826 sharesdown −20.2%down −5.6%
4 Jun 20265 Jun 2026SEC Form 41 dexercised options overnot a tradeACM Researchderivative40,002 sharesdown −20.2%down −5.6%
4 Jun 20265 Jun 2026SEC Form 41 dexercised options overnot a tradeACM Research40,002 sharesdown −20.2%down −5.6%
4 Jun 20265 Jun 2026SEC Form 41 dsold on the open marketACM Research2,060 sharesdown −20.2%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dexercised options overnot a tradeACM Research60,000 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dexercised options overnot a tradeACM Researchderivative60,000 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dsold on the open marketACM Research4,300 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dsold on the open marketACM Research6,295 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dsold on the open marketACM Research32,450 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dsold on the open marketACM Research9,925 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dsold on the open marketACM Research5,843 sharesdown −19.0%down −5.6%
3 Jun 20265 Jun 2026SEC Form 42 dsold on the open marketACM Research1,187 sharesdown −19.0%down −5.6%
13 May 20266 Jul 2026SEC Form 454 dwas grantednot a tradeACM Researchderivative6,208 sharesup +11.2%down −26.9%
12 Mar 202613 Mar 2026SEC Form 41 dexercised options overnot a tradeACM Researchderivative50,000 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dexercised options overnot a tradeACM Research50,000 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dsold on the open marketACM Research10,561 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dsold on the open marketACM Research38,737 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dsold on the open marketACM Research702 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dexercised options overnot a tradeACM Research50,000 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dsold on the open marketACM Research10,561 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dsold on the open marketACM Research38,737 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dsold on the open marketACM Research702 sharesup +59.0%up +55.2%
12 Mar 202613 Mar 2026SEC Form 41 dexercised options overnot a tradeACM Researchderivative50,000 sharesup +59.0%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dexercised options overnot a tradeACM Research60,000 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dsold on the open marketACM Research55,373 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dsold on the open marketACM Research4,627 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dexercised options overnot a tradeACM Researchderivative60,000 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dexercised options overnot a tradeACM Researchderivative60,000 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dexercised options overnot a tradeACM Research60,000 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dsold on the open marketACM Research55,373 sharesup +50.4%up +55.2%
11 Mar 202613 Mar 2026SEC Form 42 dsold on the open marketACM Research4,627 sharesup +50.4%up +55.2%
4 Feb 20266 Feb 2026SEC Form 42 dwas grantednot a tradeACM Researchderivative545,400 sharesup +27.4%up +15.2%
4 Feb 20266 Feb 2026SEC Form 42 dwas grantednot a tradeACM Researchderivative545,400 sharesup +27.4%up +15.2%
4 Dec 20255 Dec 2025SEC Form 41 dexercised options overnot a tradeACM Researchderivative60,000 sharesup +108.0%up +105.1%
4 Dec 20255 Dec 2025SEC Form 41 dexercised options overnot a tradeACM Research60,000 sharesup +108.0%up +105.1%
4 Dec 20255 Dec 2025SEC Form 41 dsold on the open marketACM Research19,817 sharesup +108.0%up +105.1%
4 Dec 20255 Dec 2025SEC Form 41 dsold on the open marketACM Research40,183 sharesup +108.0%up +105.1%
3 Dec 20255 Dec 2025SEC Form 42 dexercised options overnot a tradeACM Researchderivative70,000 sharesup +112.1%up +105.1%
3 Dec 20255 Dec 2025SEC Form 42 dexercised options overnot a tradeACM Research70,000 sharesup +112.1%up +105.1%
3 Dec 20255 Dec 2025SEC Form 42 dsold on the open marketACM Research68,800 sharesup +112.1%up +105.1%
3 Dec 20255 Dec 2025SEC Form 42 dsold on the open marketACM Research1,200 sharesup +112.1%up +105.1%
27 Oct 202529 Oct 2025SEC Form 42 dwas grantednot a tradeACM Researchderivative545,400 sharesup +69.7%up +70.7%
8 Sep 202530 Sep 2025SEC Form 422 dexercised options overnot a tradeACM Researchderivative130,000 sharesup +167.0%up +84.0%
8 Sep 202530 Sep 2025SEC Form 422 dexercised options overnot a tradeACM Research130,000 sharesup +167.0%up +84.0%
4 Sep 20255 Sep 2025SEC Form 41 dexercised options overnot a tradeACM Researchderivative60,000 sharesup +166.9%up +162.7%
4 Sep 20255 Sep 2025SEC Form 41 dexercised options overnot a tradeACM Research60,000 sharesup +166.9%up +162.7%
4 Sep 20255 Sep 2025SEC Form 41 dsold on the open marketACM Research60,000 sharesup +166.9%up +162.7%
3 Sep 20255 Sep 2025SEC Form 42 dexercised options overnot a tradeACM Researchderivative70,000 sharesup +168.4%up +162.7%
3 Sep 20255 Sep 2025SEC Form 42 dexercised options overnot a tradeACM Research70,000 sharesup +168.4%up +162.7%
3 Sep 20255 Sep 2025SEC Form 42 dsold on the open marketACM Research66,057 sharesup +168.4%up +162.7%
3 Sep 20255 Sep 2025SEC Form 42 dsold on the open marketACM Research3,943 sharesup +168.4%up +162.7%
22 May 202523 May 2025SEC Form 41 dexercised options overnot a tradeACM Researchderivative60,000 sharesup +219.4%up +221.3%
22 May 202523 May 2025SEC Form 41 dexercised options overnot a tradeACM Research60,000 sharesup +219.4%up +221.3%
22 May 202523 May 2025SEC Form 41 dsold on the open marketACM Research60,000 sharesup +219.4%up +221.3%
21 May 202523 May 2025SEC Form 42 dexercised options overnot a tradeACM Researchderivative70,000 sharesup +212.6%up +221.3%
21 May 202523 May 2025SEC Form 42 dexercised options overnot a tradeACM Research70,000 sharesup +212.6%up +221.3%
21 May 202523 May 2025SEC Form 42 dsold on the open marketACM Research69,992 sharesup +212.6%up +221.3%
21 May 202523 May 2025SEC Form 42 dsold on the open marketACM Research8 sharesup +212.6%up +221.3%
13 Mar 202513 Mar 2025SEC Form 40 dsold on the open marketACM Research36,481 sharesup +162.4%up +162.4%
13 Mar 202513 Mar 2025SEC Form 40 dsold on the open marketACM Research1,019 sharesup +162.4%up +162.4%
12 Mar 202513 Mar 2025SEC Form 41 dsold on the open marketACM Research37,500 sharesup +161.8%up +162.4%
11 Mar 202513 Mar 2025SEC Form 42 dsold on the open marketACM Research56,250 sharesup +166.5%up +162.4%
3 Mar 20255 Mar 2025SEC Form 42 dexercised options overnot a tradeACM Researchderivative210,000 sharesup +196.2%up +170.1%
3 Mar 20255 Mar 2025SEC Form 42 dexercised options overnot a tradeACM Research210,000 sharesup +196.2%up +170.1%
3 Mar 20255 Mar 2025SEC Form 42 dhad shares withheld for taxnot a tradeACM Research4,048 sharesup +196.2%up +170.1%
29 Nov 20243 Dec 2024SEC Form 44 dsold on the open marketACM Research56,250 sharesup +318.8%up +344.4%
26 Nov 202429 Nov 2024SEC Form 43 dsold on the open marketACM Research46,766 sharesup +314.5%up +318.8%
26 Nov 202429 Nov 2024SEC Form 43 dsold on the open marketACM Research9,484 sharesup +314.5%up +318.8%
22 Nov 202426 Nov 2024SEC Form 44 dsold on the open marketACM Research56,250 sharesup +283.2%up +314.5%
14 Nov 202418 Nov 2024SEC Form 44 dexercised options overnot a tradeACM Researchderivative270,000 sharesup +284.4%up +290.2%
14 Nov 202418 Nov 2024SEC Form 44 dexercised options overnot a tradeACM Research270,000 sharesup +284.4%up +290.2%
14 Nov 202418 Nov 2024SEC Form 44 dhad shares withheld for taxnot a tradeACM Research7,262 sharesup +284.4%up +290.2%
29 May 202431 May 2024SEC Form 42 dsold on the open marketACM Research45,000 sharesup +218.3%up +233.3%
29 May 202431 May 2024SEC Form 42 dsold on the open marketACM Research41,090 sharesup +218.3%up +233.3%
22 May 202424 May 2024SEC Form 42 dsold on the open marketACM Research45,000 sharesup +218.2%up +219.1%
22 May 202424 May 2024SEC Form 42 dsold on the open marketACM Research45,000 sharesup +218.2%up +219.1%
14 May 202416 May 2024SEC Form 42 dexercised options overnot a tradeACM Researchderivative180,000 sharesup +210.9%up +194.0%
14 May 202416 May 2024SEC Form 42 dexercised options overnot a tradeACM Research180,000 sharesup +210.9%up +194.0%
14 May 202416 May 2024SEC Form 42 dhad shares withheld for taxnot a tradeACM Research3,910 sharesup +210.9%up +194.0%
14 Mar 202415 Mar 2024SEC Form 41 dsold on the open marketACM Research76,478 sharesup +162.1%up +165.6%
14 Mar 202415 Mar 2024SEC Form 41 dsold on the open marketACM Research10,611 sharesup +162.1%up +165.6%
8 Mar 202412 Mar 2024SEC Form 44 dsold on the open marketACM Research45,000 sharesup +138.7%up +145.3%
8 Mar 202412 Mar 2024SEC Form 44 dsold on the open marketACM Research45,000 sharesup +138.7%up +145.3%
1 Mar 20245 Mar 2024SEC Form 44 dexercised options overnot a tradeACM Researchderivative180,000 sharesup +112.3%up +146.4%
1 Mar 20245 Mar 2024SEC Form 44 dexercised options overnot a tradeACM Research180,000 sharesup +112.3%up +146.4%
1 Mar 20245 Mar 2024SEC Form 44 dhad shares withheld for taxnot a tradeACM Research2,911 sharesup +112.3%up +146.4%
29 Nov 20231 Dec 2023SEC Form 42 dsold on the open marketACM Research45,000 sharesup +331.1%up +327.0%
29 Nov 20231 Dec 2023SEC Form 42 dsold on the open marketACM Research39,776 sharesup +331.1%up +327.0%
22 Nov 202327 Nov 2023SEC Form 45 dsold on the open marketACM Research45,000 sharesup +308.6%up +307.5%
22 Nov 202327 Nov 2023SEC Form 45 dsold on the open marketACM Research45,000 sharesup +308.6%up +307.5%
14 Nov 202316 Nov 2023SEC Form 42 dexercised options overnot a tradeACM Researchderivative180,000 sharesup +303.6%up +301.6%
14 Nov 202316 Nov 2023SEC Form 42 dexercised options overnot a tradeACM Research180,000 sharesup +303.6%up +301.6%
14 Nov 202316 Nov 2023SEC Form 42 dhad shares withheld for taxnot a tradeACM Research5,224 sharesup +303.6%up +301.6%
13 Sep 202314 Sep 2023SEC Form 41 dsold on the open marketACM Research85,116 sharesup +309.3%up +330.1%
12 Sep 202314 Sep 2023SEC Form 42 dsold on the open marketACM Research86,427 sharesup +304.8%up +330.1%
12 Sep 202314 Sep 2023SEC Form 42 dsold on the open marketACM Research3,573 sharesup +304.8%up +330.1%
4 Sep 20236 Sep 2023SEC Form 42 dexercised options overnot a tradeACM Researchderivative180,000 sharesup +290.7%up +272.3%
4 Sep 20236 Sep 2023SEC Form 42 dexercised options overnot a tradeACM Research180,000 sharesup +290.7%up +272.3%
4 Sep 20236 Sep 2023SEC Form 42 dhad shares withheld for taxnot a tradeACM Research4,884 sharesup +290.7%up +272.3%
10 Aug 202321 Aug 2023SEC Form 411 dwas grantednot a tradeACM Researchderivative1,080,000 sharesup +418.4%up +424.4%
10 Aug 202314 Aug 2023SEC Form 44 dwas grantednot a tradeACM Researchderivative1,080,000 sharesup +418.4%up +422.1%
19 Mar 202122 Mar 2021SEC Form 43 dsold on the open marketACM Research49,228 sharesup +138.1%up +131.0%
18 Mar 202122 Mar 2021SEC Form 44 dsold on the open marketACM Research50,000 sharesup +141.2%up +131.0%
12 Mar 202116 Mar 2021SEC Form 44 dexercised options overnot a tradeACM Research100,001 sharesup +135.8%up +131.9%
12 Mar 202116 Mar 2021SEC Form 44 dhad shares withheld for taxnot a tradeACM Research773 sharesup +135.8%up +131.9%
12 Mar 202116 Mar 2021SEC Form 44 dexercised options overnot a tradeACM Researchderivative100,001 sharesup +135.8%up +131.9%
4 Dec 20207 Dec 2020SEC Form 43 dsold on the open marketACM Research49,322 sharesup +177.9%up +156.7%
3 Dec 20207 Dec 2020SEC Form 44 dsold on the open marketACM Research16,666 sharesup +166.3%up +156.7%
3 Dec 20207 Dec 2020SEC Form 44 dsold on the open marketACM Research32,995 sharesup +166.3%up +156.7%
25 Nov 202027 Nov 2020SEC Form 42 dexercised options overnot a tradeACM Researchderivative33,334 sharesup +180.3%up +158.0%
25 Nov 202027 Nov 2020SEC Form 42 dexercised options overnot a tradeACM Researchderivative66,666 sharesup +180.3%up +158.0%
25 Nov 202027 Nov 2020SEC Form 42 dexercised options overnot a tradeACM Research33,334 sharesup +180.3%up +158.0%
25 Nov 202027 Nov 2020SEC Form 42 dhad shares withheld for taxnot a tradeACM Research339 sharesup +180.3%up +158.0%
25 Nov 202027 Nov 2020SEC Form 42 dexercised options overnot a tradeACM Research66,666 sharesup +180.3%up +158.0%
25 Nov 202027 Nov 2020SEC Form 42 dhad shares withheld for taxnot a tradeACM Research678 sharesup +180.3%up +158.0%
4 Sep 20204 Sep 2020SEC Form 40 dsold on the open marketACM Research49,453 sharesup +163.2%up +163.2%
3 Sep 20204 Sep 2020SEC Form 41 dsold on the open marketACM Research20,000 sharesup +157.1%up +163.2%
27 Aug 202031 Aug 2020SEC Form 44 dexercised options overnot a tradeACM Researchderivative70,000 sharesup +137.8%up +143.2%
27 Aug 202031 Aug 2020SEC Form 44 dexercised options overnot a tradeACM Research70,000 sharesup +137.8%up +143.2%
27 Aug 202031 Aug 2020SEC Form 44 dhad shares withheld for taxnot a tradeACM Research547 sharesup +137.8%up +143.2%
5 Aug 20207 Aug 2020SEC Form 42 dwas grantednot a tradeACM Researchderivative181,799 sharesup +100.1%up +111.9%
21 May 202026 May 2020SEC Form 45 dconvertednot a tradeACM Researchderivative33,334 sharesup +296.3%up +264.9%
21 May 202026 May 2020SEC Form 45 dconvertednot a tradeACM Research33,334 sharesup +296.3%up +264.9%
23 Aug 201927 Aug 2019SEC Form 44 dreturned to the issuernot a tradeACM Research28,661 sharesup +1433.0%up +1458.4%
20 Aug 201921 Aug 2019SEC Form 41 dexercised options overnot a tradeACM Researchderivative30,000 sharesup +1417.9%up +1415.8%
20 Aug 201921 Aug 2019SEC Form 41 dexercised options overnot a tradeACM Research30,000 sharesup +1417.9%up +1415.8%
23 Apr 201925 Apr 2019SEC Form 42 dwas grantednot a tradeACM Researchderivative50,000 sharesup +1184.9%up +1250.8%
29 Jun 20183 Jul 2018SEC Form 44 dexercised options overnot a tradeACM Researchderivative15,279 sharesup +1903.7%up +1865.4%
29 Jun 20183 Jul 2018SEC Form 44 dexercised options overnot a tradeACM Research15,279 sharesup +1903.7%up +1865.4%

Both percentages are the stock’s move, not David H. Wang’s return: a disclosure gives a band, never an amount, so nobody can say how much was bought or what it made. They run to the last close we hold — 11 Sep 2026, except where a name has since delisted, when the row names its own last session. We publish no close, no volume and no dollar figure behind them. 145 of the 145 rows shown carry a percentage; the rest are dashes with the reason on the row.

Positions come from the unitedstates/congress-legislators roster, the Office of Government Ethics and the SEC’s Form 4 index. Every disclosed line names its own source and links the document the government published; we print what the filing says and never a price we did not read from it. Headlines and links come from the GDELT Global Knowledge Graph — the story stays with the publisher. The portrait, where we have one, is the public-domain Congressional Bioguide photograph.

Some filings reach us as photographs of paper rather than as a form we can read as text. Those are shown here only once they have been read and checked, so this page can hold fewer lines than the filings behind it contain. The link on every row opens the original document, which is always the full record.