ACMR

ACM Research, Inc.

$98.90 +4.82 (+5.12%) At close · Jul 14

Market Cap

$6.09B

66,224,872

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

Insider Sentiment Score

Peer-relative 0–100 rank of how aggressively insiders accumulated over the trailing 90 days. See the full ranking.

Net buyers

-4

Net shares bought

-0.19%

Net buy value

-$11,012,422

Date	Insider	Role	Type	Security	Shares	Price	Value	After
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
2026-06-03	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 $90.24 to $91.22, inclusive.	Class A Common Stock	9,925	$90.78	$900,992	809,738
2026-06-03	Wang David H	Director, See Remarks, 10% Owner	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	60,000	—	—	310,002
2026-06-03	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. These shares were sold in multiple transactions at prices ranging from $87.22 to $88.04, 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), (10), (11), and (12) to this Form 4.	Class A Common Stock	4,300	$87.57	$376,551	858,408
2026-06-03	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 $88.24 to $89.22, inclusive.	Class A Common Stock	6,295	$88.98	$560,129	852,113
2026-06-03	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 $93.02 to $93.39, inclusive.	Class A Common Stock	1,187	$93.04	$110,438	802,708
2026-06-03	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 $89.24 to $90.22, inclusive.	Class A Common Stock	32,450	$89.84	$2,915,308	819,663
2026-06-03	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 $92.01 to $92.8, inclusive.	Class A Common Stock	5,843	$92.38	$539,776	803,895
2026-05-19	Dun Haiping	Director	Convert↑	Class A Common Stock	5,000	$5.60	$28,000	5,000
2026-05-19	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 $63.7 to $64.22, 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), and (5) to this Form 4.	Class A Common Stock	1,333	$63.84	$85,099	3,667
2026-05-19	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 $66.41 to $67.37, inclusive.	Class A Common Stock	1,309	$67.21	$87,978	1,858
2026-05-19	Dun Haiping	Director	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	5,000	—	—	50,000
2026-05-19	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 $64.78 to $65.77, inclusive.	Class A Common Stock	500	$65.09	$32,545	3,167
2026-05-19	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 $67.43 to $68.00, inclusive.	Class A Common Stock	1,858	$67.54	$125,489	0
2026-05-13	Wang David H	Director, See Remarks, 10% Owner	Award↑ Filing footnotes — Restricted Stock Units (Indirect) Each restricted stock unit represents a contingent right to receive one share of ACMR common stock. The number of RSUs granted will be determined by dividing the applicable annual grant value by the 30-day lookback average fair market value of the Issuer's common stock, determined to be $51.54 per share. The restricted stock units vest in four equal annual installments beginning May 13, 2027.	Restricted Stock Units (I)	6,208	—	—	6,208
2026-04-17	Pappis Charles C	Director	Sell↓ Filing footnotes — Class A Common Stock (Direct) The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 20, 2025.	Class A Common Stock	5,000	$52.00	$260,000	0
2026-04-17	Pappis Charles C	Director	Convert↑ Filing footnotes — Class A Common Stock (Direct) On April 17, 2026, the reporting person exercised a previously issued stock option to purchase 5,000 shares of Class A Common Stock of the Issuer.	Class A Common Stock	5,000	$29.18	$145,900	5,000
2026-04-17	Pappis Charles C	Director	Convert↓ Filing footnotes — Stock Option (Direct) On April 17, 2026, the reporting person exercised a previously issued stock option to purchase 5,000 shares of Class A Common Stock of the Issuer. The option is fully vested and exercisable.	Stock Option	5,000	—	—	0
2026-03-12	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 August 27, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.37 to $45.35, 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) and (7) to this Form 4.	Class A Common Stock	11,910	$44.89	$534,640	48,990
2026-03-12	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 $46.45 to $46.59, inclusive.	Class A Common Stock	702	$46.57	$32,692	802,708
2026-03-12	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 August 27, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.40 to $45.39, inclusive.	Class A Common Stock	8,639	$44.94	$388,237	30,812
2026-03-12	McKechnie Mark	See Remarks	Convert↑	Class A Common Stock	60,000	$13.89	$833,400	60,900
2026-03-12	McKechnie Mark	See Remarks	Convert↑	Class A Common Stock	38,551	$19.49	$751,359	39,451
2026-03-12	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 August 27, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $46.45 to $46.59, inclusive.	Class A Common Stock	564	$46.57	$26,265	900
2026-03-12	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 August 27, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.37 to $46.36, inclusive.	Class A Common Stock	47,108	$45.74	$2,154,720	1,882
2026-03-12	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 $45.40 to $46.39, inclusive.	Class A Common Stock	38,737	$45.74	$1,771,830	803,410
2026-03-12	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 $44.40 to $45.39, inclusive.	Class A Common Stock	10,561	$44.92	$474,400	842,147
2026-03-12	McKechnie Mark	See Remarks	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	60,000	—	—	240,000
2026-03-12	McKechnie Mark	See Remarks	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	38,551	—	—	61,449
2026-03-12	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 August 27, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $46.39 to $46.59, inclusive.	Class A Common Stock	982	$46.55	$45,712	900
2026-03-12	Wang David H	Director, See Remarks, 10% Owner	Convert↓ Filing footnotes — Stock Option (Direct) The option is fully vested and exercisable.	Stock Option	50,000	—	—	370,002
2026-03-12	Wang David H	Director, See Remarks, 10% Owner	Convert↑	Class A Common Stock	50,000	$1.00	$50,000	852,708

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

Showing 1–50 of 553 transactions

Key facts CIK 1680062 CUSIP 00108J109 13F (30d) 18 filings 18 filers Visit website Investor relations