ACMR · ACM Research, Inc. · Insider Trading

$55.61 +0.65 (+1.18%)

S&P 600 member Russell 2000 member Rebalance outlook locked

Market Cap

$3.87B

69.65M

Volume · Oct 21 127.72K Avg daily vol (3M) 1.08M

Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 4 and 5. Form 3 supplies initial ownership rather than a trade; Form 4 must be filed within two business days of the trade.

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Date	Insider	Role	Type	Security	Shares	Price	Value	After
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $73.26 to $74.21, inclusive.	Class A Common Stock	33,493	$73.80	$2,471,783	839,215
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Convert↑	Class A Common Stock	70,000	$1.00	$70,000	872,708
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.28 to $75.95, inclusive.	Class A Common Stock	11,666	$75.58	$881,716	808,615
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $74.26 to $75.22, inclusive.	Class A Common Stock	18,934	$74.67	$1,413,802	820,281
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.59 to $77.59, inclusive.	Class A Common Stock	1,100	$77.59	$85,349	802,708
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	70,000	—	—	130,000
2026-09-09	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.38 to $77.35, inclusive.	Class A Common Stock	4,807	$76.73	$368,841	803,808
2026-09-08	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.52 to $77.5, inclusive.	Class A Common Stock	51,374	$77.15	$3,963,504	816,531
2026-09-08	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.52 to $76.41, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), (4), (5), (6), (7), (8), (9), and (10) to this Form 4.	Class A Common Stock	4,803	$75.99	$364,980	867,905
2026-09-08	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.52 to $78.48, inclusive.	Class A Common Stock	12,323	$78.08	$962,180	804,208
2026-09-08	Wang David H	Director, See Remarks, 10% Owner	Convert↑	Class A Common Stock	70,000	$1.00	$70,000	872,708
2026-09-08	Wang David H	Director, See Remarks, 10% Owner	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	70,000	—	—	200,000
2026-09-08	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $78.55 to $78.64, inclusive.	Class A Common Stock	1,500	$78.57	$117,855	802,708
2026-08-20	McKechnie Mark	See Remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 21, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.76 to $76.68, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), and (4) to this Form 4.	Class A Common Stock	13,625	$76.34	$1,040,133	42,474
2026-08-20	McKechnie Mark	See Remarks	Convert↑	Class A Common Stock	25,000	$13.89	$347,250	56,099
2026-08-20	McKechnie Mark	See Remarks	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	30,199	—	—	31,250
2026-08-20	McKechnie Mark	See Remarks	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	25,000	—	—	215,000
2026-08-20	McKechnie Mark	See Remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 21, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.81 to $77.79, inclusive.	Class A Common Stock	30,365	$77.45	$2,351,769	12,109
2026-08-20	McKechnie Mark	See Remarks	Convert↑	Class A Common Stock	30,199	$19.49	$588,579	31,099
2026-08-20	McKechnie Mark	See Remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 21, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.84 to $78.4, inclusive.	Class A Common Stock	11,209	$77.89	$873,069	900
2026-08-18	Dun Haiping	Director	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $80.95 to $81.91, inclusive.	Class A Common Stock	3,400	$81.31	$276,454	400
2026-08-18	Dun Haiping	Director	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.89 to $80.77, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), and (4) to this Form 4.	Class A Common Stock	1,200	$80.29	$96,348	3,800
2026-08-18	Dun Haiping	Director	Convert↑	Class A Common Stock	5,000	$5.60	$28,000	5,000
2026-08-18	Dun Haiping	Director	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $81.97 to $82.33, inclusive.	Class A Common Stock	400	$82.17	$32,868	0
2026-08-18	Dun Haiping	Director	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	5,000	—	—	45,000
2026-08-12	Liu Tracy	Director	Award↑ Filing footnotes — Restricted Stock Units (Direct) The price per restricted stock unit is based on the average closing market price of the Issuer's common stock for the 30 trading days preceding the grant day. The restricted stock units should be vested immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service.	Restricted Stock Units	728	—	—	728
2026-08-12	Dun Haiping	Director	Award↑ Filing footnotes — Restricted Stock Units (Direct) The price per restricted stock unit is based on the average closing market price of the Issuer's common stock for the 30 trading days preceding the grant day. The restricted stock units should be vested immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service.	Restricted Stock Units	728	—	—	728
2026-08-12	Pappis Charles C	Director	Award↑ Filing footnotes — Restricted Stock Units (Direct) The price per restricted stock unit is based on the average closing market price of the Issuer's common stock for the 30 trading days preceding the grant day. The restricted stock units should be vested immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service.	Restricted Stock Units	728	—	—	728
2026-08-12	Pappis Charles C	Director	Award↑ Filing footnotes — Stock Option (Direct) The option will vest and become exercisable immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service through the vesting date.	Stock Option	6,400	—	—	6,400
2026-08-12	Liu Tracy	Director	Award↑ Filing footnotes — Stock Option (Direct) The option will vest and become exercisable immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service through the vesting date.	Stock Option	6,400	—	—	6,400
2026-08-12	Dun Haiping	Director	Award↑ Filing footnotes — Stock Option (Direct) The option will vest and become exercisable immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service through the vesting date.	Stock Option	6,400	—	—	6,400
2026-06-05	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $81.22 to $82.07, inclusive.	Class A Common Stock	2,384	$81.73	$194,844	103,017
2026-06-05	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $83.85 to $84.5, inclusive.	Class A Common Stock	400	$84.01	$33,604	101,649
2026-06-05	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $82.38 to $82.89, inclusive.	Class A Common Stock	968	$82.61	$79,966	102,049
2026-06-05	Cheav Sotheara	See remarks	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	5,399	—	—	37,500
2026-06-05	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.27 to $85.72, inclusive.	Class A Common Stock	1,647	$85.41	$140,670	100,002
2026-06-05	Cheav Sotheara	See remarks	Convert↑	Class A Common Stock	5,399	$13.89	$74,992	105,401
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Convert↑	Class A Common Stock	40,002	$1.00	$40,002	842,710
2026-06-04	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.61 to $84.4, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), (4), (5), (6), (7), and (8) to this Form 4.	Class A Common Stock	1,300	$84.08	$109,304	112,053
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	40,002	—	—	270,000
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $86.73 to $87.66, inclusive.	Class A Common Stock	8,581	$87.13	$747,663	803,534
2026-06-04	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.7 to $86.19, inclusive.	Class A Common Stock	2,839	$85.77	$243,501	100,002
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $84.62 to $85.6, inclusive.	Class A Common Stock	17,543	$85.11	$1,493,085	823,107
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $87.77 to $88.01, inclusive.	Class A Common Stock	826	$87.91	$72,614	802,708
2026-06-04	Cheav Sotheara	See remarks	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	13,351	—	—	42,899
2026-06-04	Cheav Sotheara	See remarks	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $84.63 to $85.6, inclusive.	Class A Common Stock	9,212	$85.11	$784,033	102,841
2026-06-04	Cheav Sotheara	See remarks	Convert↑	Class A Common Stock	13,351	$13.89	$185,445	113,353
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $83.61 to $84.24, inclusive.	Class A Common Stock	2,060	$83.86	$172,752	840,650
2026-06-04	Wang David H	Director, See Remarks, 10% Owner	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.7 to $86.57, inclusive.	Class A Common Stock	10,992	$86.07	$946,081	812,115
2026-06-03	Wang David H	Director, See Remarks, 10% Owner	Convert↑	Class A Common Stock	60,000	$1.00	$60,000	862,708

Legend Buy — open-market purchase Sell — open-market sale ↑ Shares acquired ↓ Shares disposed (gift, conversion, tax…)

Showing 1–50 of 583 transactions

Key facts CIK 1680062 CUSIP 00108J109 13F (30d) 44 filings 43 filers Visit website Investor relations