ACM Research, Inc. (ACMR) · Insider trading

What ACM Research's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months

0 insiders, 0 trades

Sold, 12 months

$51.15M

8 insiders, 100% under a plan

Net, 12 months

−$51.15M

bought less sold

Latest filing

2026-09-10

filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

Bought Sold Largest month: $14.41M

Who traded, two years

Insider	Bought	Sold	Trades	Last trade	Holds after
Wang David HDirector, See Remarks, 10% owner	–	$42.06M	43	2026-09-09	839,215
McKechnie MarkSee Remarks	–	$10.97M	15	2026-08-20	42,474
Hu ChenmingDirector	–	$4.90M	1	2025-03-17	100,002
Chen FupingSee remarks	–	$3.98M	3	2025-12-03	300
Liu TracyDirector	–	$3.80M	6	2026-03-11	114,149
Feng LisaSee remarks	–	$3.25M	8	2026-03-06	50,201
Wang JianSee remarks	–	$2.91M	3	2025-09-18	253,158
Cheav SothearaSee remarks	–	$2.79M	10	2026-06-05	103,017
Dun HaipingDirector	–	$2.25M	14	2026-08-18	3,800
Pappis Charles CDirector	–	$510,450	2	2026-04-17	0

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

Date	Insider	Trade	Shares	Price	Value	Holds after	Filing
2026-09-09	Wang David HDirector, See Remarks, 10% owner	Saleplan	33,493	73.80	$2.47M	839,215	Form 4
2026-09-09	Wang David HDirector, See Remarks, 10% owner	Saleplan	18,934	74.67	$1.41M	820,281	Form 4
2026-09-09	Wang David HDirector, See Remarks, 10% owner	Saleplan	11,666	75.58	$881,716	808,615	Form 4
2026-09-09	Wang David HDirector, See Remarks, 10% owner	Saleplan	4,807	76.73	$368,841	803,808	Form 4
2026-09-09	Wang David HDirector, See Remarks, 10% owner	Saleplan	1,100	77.59	$85,349	802,708	Form 4
2026-09-08	Wang David HDirector, See Remarks, 10% owner	Saleplan	4,803	75.99	$364,980	867,905	Form 4
2026-09-08	Wang David HDirector, See Remarks, 10% owner	Saleplan	51,374	77.15	$3.96M	816,531	Form 4
2026-09-08	Wang David HDirector, See Remarks, 10% owner	Saleplan	12,323	78.08	$962,180	804,208	Form 4
2026-09-08	Wang David HDirector, See Remarks, 10% owner	Saleplan	1,500	78.57	$117,855	802,708	Form 4
2026-08-20	McKechnie MarkSee Remarks	Saleplan	13,625	76.34	$1.04M	42,474	Form 4
2026-08-20	McKechnie MarkSee Remarks	Saleplan	30,365	77.45	$2.35M	12,109	Form 4
2026-08-20	McKechnie MarkSee Remarks	Saleplan	11,209	77.89	$873,069	900	Form 4
2026-08-18	Dun HaipingDirector	Saleplan	1,200	80.29	$96,348	3,800	Form 4
2026-08-18	Dun HaipingDirector	Saleplan	3,400	81.31	$276,454	400	Form 4
2026-08-18	Dun HaipingDirector	Saleplan	400	82.17	$32,868	0	Form 4
2026-06-05	Cheav SothearaSee remarks	Saleplan	2,384	81.73	$194,844	103,017	Form 4
2026-06-05	Cheav SothearaSee remarks	Saleplan	968	82.61	$79,966	102,049	Form 4
2026-06-05	Cheav SothearaSee remarks	Saleplan	400	84.01	$33,604	101,649	Form 4
2026-06-05	Cheav SothearaSee remarks	Saleplan	1,647	85.41	$140,670	100,002	Form 4
2026-06-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	2,060	83.86	$172,752	840,650	Form 4
2026-06-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	17,543	85.11	$1.49M	823,107	Form 4
2026-06-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	10,992	86.07	$946,081	812,115	Form 4
2026-06-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	8,581	87.13	$747,663	803,534	Form 4
2026-06-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	826	87.91	$72,614	802,708	Form 4
2026-06-04	Cheav SothearaSee remarks	Saleplan	1,300	84.08	$109,304	112,053	Form 4
2026-06-04	Cheav SothearaSee remarks	Saleplan	9,212	85.11	$784,033	102,841	Form 4
2026-06-04	Cheav SothearaSee remarks	Saleplan	2,839	85.77	$243,501	100,002	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	4,300	87.57	$376,551	858,408	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	6,295	88.98	$560,129	852,113	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	32,450	89.84	$2.92M	819,663	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	9,925	90.78	$900,992	809,738	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	5,843	92.38	$539,776	803,895	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	1,187	93.04	$110,438	802,708	Form 4
2026-05-19	Dun HaipingDirector	Saleplan	1,333	63.84	$85,099	3,667	Form 4
2026-05-19	Dun HaipingDirector	Saleplan	500	65.09	$32,545	3,167	Form 4
2026-05-19	Dun HaipingDirector	Saleplan	1,309	67.21	$87,978	1,858	Form 4
2026-05-19	Dun HaipingDirector	Saleplan	1,858	67.54	$125,489	0	Form 4
2026-04-17	Pappis Charles CDirector	Saleplan	5,000	52.00	$260,000	0	Form 4
2026-03-12	Wang David HDirector, See Remarks, 10% owner	Saleplan	10,561	44.92	$474,400	842,147	Form 4
2026-03-12	Wang David HDirector, See Remarks, 10% owner	Saleplan	38,737	45.74	$1.77M	803,410	Form 4

65 more

2026-03-12	Wang David HDirector, See Remarks, 10% owner	Saleplan	702	46.57	$32,692	802,708	Form 4
2026-03-12	McKechnie MarkSee Remarks	Saleplan	11,910	44.89	$534,640	48,990	Form 4
2026-03-12	McKechnie MarkSee Remarks	Saleplan	47,108	45.74	$2.15M	1,882	Form 4
2026-03-12	McKechnie MarkSee Remarks	Saleplan	982	46.55	$45,712	900	Form 4
2026-03-12	McKechnie MarkSee Remarks	Saleplan	8,639	44.94	$388,237	30,812	Form 4
2026-03-12	McKechnie MarkSee Remarks	Saleplan	29,348	45.74	$1.34M	1,464	Form 4
2026-03-12	McKechnie MarkSee Remarks	Saleplan	564	46.57	$26,265	900	Form 4
2026-03-11	Wang David HDirector, See Remarks, 10% owner	Saleplan	55,373	47.89	$2.65M	807,335	Form 4
2026-03-11	Wang David HDirector, See Remarks, 10% owner	Saleplan	4,627	48.34	$223,669	802,708	Form 4
2026-03-11	Liu TracyDirector	Saleplan	11,623	47.81	$555,696	114,149	Form 4
2026-03-11	Liu TracyDirector	Saleplan	3,377	48.25	$162,940	110,772	Form 4
2026-03-10	Liu TracyDirector	Saleplan	32,216	47.06	$1.52M	123,556	Form 4
2026-03-10	Liu TracyDirector	Saleplan	12,784	48.19	$616,061	110,772	Form 4
2026-03-09	Dun HaipingDirector	Saleplan	4,100	43.37	$177,817	900	Form 4
2026-03-09	Dun HaipingDirector	Saleplan	900	43.94	$39,546	0	Form 4
2026-03-06	Feng LisaSee remarks	Saleplan	14,800	46.07	$681,836	50,201	Form 4
2026-03-06	Feng LisaSee remarks	Saleplan	200	46.58	$9,316	50,001	Form 4
2026-03-05	Feng LisaSee remarks	Saleplan	8,050	49.81	$400,970	56,951	Form 4
2026-03-05	Feng LisaSee remarks	Saleplan	6,950	50.24	$349,168	50,001	Form 4
2026-03-05	Pappis Charles CDirector	Saleplan	5,000	50.09	$250,450	0	Form 4
2025-12-08	McKechnie MarkSee Remarks	Saleplan	22,500	35.45	$797,625	900	Form 4
2025-12-04	McKechnie MarkSee Remarks	Saleplan	7,754	33.50	$259,759	1,896	Form 4
2025-12-04	McKechnie MarkSee Remarks	Saleplan	996	34.26	$34,123	900	Form 4
2025-12-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	19,817	33.52	$664,266	842,891	Form 4
2025-12-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	40,183	34.42	$1.38M	802,708	Form 4
2025-12-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	68,800	33.05	$2.27M	803,908	Form 4
2025-12-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	1,200	33.56	$40,272	802,708	Form 4
2025-12-03	Chen FupingSee remarks	Saleplan	19,700	33.05	$651,085	300	Form 4
2025-12-03	Chen FupingSee remarks	Saleplan	300	33.57	$10,071	0	Form 4
2025-12-02	Chen FupingSee remarks	Saleplan	100,000	33.20	$3.32M	0	Form 4
2025-11-13	Feng LisaSee remarks	Saleplan	15,000	33.77	$506,550	50,001	Form 4
2025-11-12	Feng LisaSee remarks	Saleplan	15,000	32.76	$491,400	50,001	Form 4
2025-09-18	Wang JianSee remarks	Saleplan	30,000	35.00	$1.05M	253,158	Form 4
2025-09-18	Cheav SothearaSee remarks	Saleplan	10,000	35.00	$350,000	100,002	Form 4
2025-09-17	Liu TracyDirector	Saleplan	15,000	33.00	$495,000	110,772	Form 4
2025-09-04	Wang David HDirector, See Remarks, 10% owner	Saleplan	60,000	26.44	$1.59M	672,708	Form 4
2025-09-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	66,057	26.73	$1.77M	676,651	Form 4
2025-09-03	Wang David HDirector, See Remarks, 10% owner	Saleplan	3,943	27.31	$107,683	672,708	Form 4
2025-08-25	Wang JianSee remarks	Saleplan	30,000	32.00	$960,000	253,158	Form 4
2025-08-22	Wang JianSee remarks	Saleplan	30,000	30.00	$900,000	253,158	Form 4
2025-08-22	Cheav SothearaSee remarks	Saleplan	11,152	30.00	$334,560	100,002	Form 4
2025-07-15	Liu TracyDirector	Saleplan	15,000	30.00	$450,000	110,772	Form 4
2025-07-07	Feng LisaSee remarks	Saleplan	15,000	28.00	$420,000	50,001	Form 4
2025-06-24	Feng LisaSee remarks	Saleplan	15,000	26.00	$390,000	50,001	Form 4
2025-05-22	Wang David HDirector, See Remarks, 10% owner	Saleplan	60,000	22.63	$1.36M	672,708	Form 4
2025-05-21	Wang David HDirector, See Remarks, 10% owner	Saleplan	69,992	23.60	$1.65M	672,716	Form 4
2025-05-21	Wang David HDirector, See Remarks, 10% owner	Saleplan	8	24.04	$192	672,708	Form 4
2025-05-14	McKechnie MarkSee Remarks	Saleplan	15,000	25.22	$378,300	900	Form 4
2025-03-17	Hu ChenmingDirector	Saleplan	163,308	30.00	$4.90M	100,002	Form 4
2025-03-14	Dun HaipingDirector	Saleplan	2,456	28.32	$69,554	762,152	Form 4
2025-03-14	Dun HaipingDirector	Saleplan	7,062	29.23	$206,422	755,090	Form 4
2025-03-13	Wang David HDirector, See Remarks, 10% owner	Saleplan	36,481	27.29	$995,566	673,727	Form 4
2025-03-13	Wang David HDirector, See Remarks, 10% owner	Saleplan	1,019	27.65	$28,175	672,708	Form 4
2025-03-12	McKechnie MarkSee Remarks	Saleplan	15,000	27.42	$411,300	900	Form 4
2025-03-12	Wang David HDirector, See Remarks, 10% owner	Saleplan	37,500	27.42	$1.03M	710,208	Form 4
2025-03-11	Wang David HDirector, See Remarks, 10% owner	Saleplan	56,250	26.57	$1.49M	747,708	Form 4
2025-03-10	Dun HaipingDirector	Saleplan	15,001	26.54	$398,127	764,608	Form 4
2025-02-06	McKechnie MarkSee Remarks	Saleplan	15,000	22.00	$330,000	900	Form 4
2025-02-06	Cheav SothearaSee remarks	Saleplan	22,598	23.00	$519,754	100,002	Form 4
2024-11-29	Wang David HDirector, See Remarks, 10% owner	Saleplan	56,250	17.44	$981,000	598,006	Form 4
2024-11-29	Dun HaipingDirector	Saleplan	19,058	17.43	$332,181	755,090	Form 4
2024-11-26	Wang David HDirector, See Remarks, 10% owner	Saleplan	46,766	17.80	$832,435	663,740	Form 4
2024-11-26	Wang David HDirector, See Remarks, 10% owner	Saleplan	9,484	18.31	$173,652	654,256	Form 4
2024-11-22	Wang David HDirector, See Remarks, 10% owner	Saleplan	56,250	19.08	$1.07M	710,506	Form 4
2024-11-22	Dun HaipingDirector	Saleplan	15,000	19.12	$286,800	774,148	Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

52 × option exercise4 × shares withheld for tax1 × gift

Show them

Date	Insider	What	Shares	Price	Holds after	Filing
2026-09-09	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+70,000	1.00	872,708	Form 4
2026-09-08	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+70,000	1.00	872,708	Form 4
2026-08-20	McKechnie MarkSee Remarks	Option exercise M	+30,199	19.49	31,099	Form 4
2026-08-20	McKechnie MarkSee Remarks	Option exercise M	+25,000	13.89	56,099	Form 4
2026-08-18	Dun HaipingDirector	Option exercise M	+5,000	5.60	5,000	Form 4
2026-06-05	Cheav SothearaSee remarks	Option exercise M	+5,399	13.89	105,401	Form 4
2026-06-04	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+40,002	1.00	842,710	Form 4
2026-06-04	Cheav SothearaSee remarks	Option exercise M	+13,351	13.89	113,353	Form 4
2026-06-03	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+60,000	1.00	862,708	Form 4
2026-05-19	Dun HaipingDirector	Option exercise M	+5,000	5.60	5,000	Form 4
2026-04-17	Pappis Charles CDirector	Option exercise M	+5,000	29.18	5,000	Form 4
2026-03-12	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+50,000	1.00	852,708	Form 4
2026-03-12	McKechnie MarkSee Remarks	Option exercise M	+60,000	13.89	60,900	Form 4
2026-03-12	McKechnie MarkSee Remarks	Option exercise M	+38,551	19.49	39,451	Form 4
2026-03-11	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+60,000	1.00	862,708	Form 4
2026-03-11	Liu TracyDirector	Option exercise M	+15,000	1.00	125,772	Form 4
2026-03-10	Liu TracyDirector	Option exercise M	+45,000	1.00	155,772	Form 4
2026-03-09	Dun HaipingDirector	Option exercise M	+5,000	5.60	5,000	Form 4
2026-03-06	Feng LisaSee remarks	Option exercise M	+15,000	4.55	65,001	Form 4
2026-03-05	Feng LisaSee remarks	Option exercise M	+15,000	4.55	65,001	Form 4
2026-03-05	Pappis Charles CDirector	Option exercise M	+5,000	29.18	5,000	Form 4
2025-12-08	McKechnie MarkSee Remarks	Option exercise M	+22,500	25.45	23,400	Form 4
2025-12-04	McKechnie MarkSee Remarks	Option exercise M	+8,750	4.55	9,650	Form 4
2025-12-04	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+60,000	1.00	862,708	Form 4
2025-12-03	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+70,000	1.00	872,708	Form 4
2025-12-03	Chen FupingSee remarks	Option exercise M	+20,000	1.77	20,000	Form 4
2025-12-02	Chen FupingSee remarks	Option exercise M	+100,000	1.77	100,000	Form 4
2025-11-13	Feng LisaSee remarks	Option exercise M	+15,000	5.60	65,001	Form 4
2025-11-12	Feng LisaSee remarks	Option exercise M	+15,000	5.60	65,001	Form 4
2025-11-12	Dun HaipingDirector	Gift G	−755,090	–	0	Form 4
2025-09-18	Wang JianSee remarks	Option exercise M	+30,000	5.60	283,158	Form 4
2025-09-18	Cheav SothearaSee remarks	Option exercise M	+10,000	13.89	110,002	Form 4
2025-09-17	Liu TracyDirector	Option exercise M	+15,000	1.00	125,772	Form 4
2025-09-08	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+130,000	1.00	802,708	Form 4
2025-09-04	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+60,000	1.00	732,708	Form 4
2025-09-03	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+70,000	1.00	742,708	Form 4
2025-08-25	Wang JianSee remarks	Option exercise M	+30,000	5.60	283,158	Form 4
2025-08-22	Wang JianSee remarks	Option exercise M	+30,000	5.60	283,158	Form 4
2025-08-22	Cheav SothearaSee remarks	Option exercise M	+11,152	13.89	111,154	Form 4
2025-07-15	Liu TracyDirector	Option exercise M	+15,000	1.00	125,772	Form 4
2025-07-07	Feng LisaSee remarks	Option exercise M	+15,000	5.60	65,001	Form 4
2025-06-24	Feng LisaSee remarks	Option exercise M	+15,000	5.60	65,001	Form 4
2025-05-22	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+60,000	1.00	732,708	Form 4
2025-05-21	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+70,000	1.00	742,708	Form 4
2025-05-14	McKechnie MarkSee Remarks	Option exercise M	+15,000	5.60	15,900	Form 4
2025-03-12	McKechnie MarkSee Remarks	Option exercise M	+15,000	5.60	15,900	Form 4
2025-03-03	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+210,000	0.50	808,006	Form 4
2025-03-03	Wang David HDirector, See Remarks, 10% owner	Shares withheld for tax F	−4,048	25.94	803,958	Form 4
2025-03-03	Dun HaipingDirector	Option exercise M	+25,001	0.50	780,091	Form 4
2025-03-03	Dun HaipingDirector	Shares withheld for tax F	−482	25.94	779,609	Form 4
2025-02-06	McKechnie MarkSee Remarks	Option exercise M	+15,000	5.60	15,900	Form 4
2025-02-06	Cheav SothearaSee remarks	Option exercise M	+10,000	13.89	110,002	Form 4
2025-02-06	Cheav SothearaSee remarks	Option exercise M	+12,598	13.89	122,600	Form 4
2024-11-14	Wang David HDirector, See Remarks, 10% owner	Option exercise M	+270,000	0.50	774,018	Form 4
2024-11-14	Wang David HDirector, See Remarks, 10% owner	Shares withheld for tax F	−7,262	18.59	766,756	Form 4
2024-11-14	Dun HaipingDirector	Option exercise M	+35,000	0.50	790,090	Form 4
2024-11-14	Dun HaipingDirector	Shares withheld for tax F	−942	18.59	789,148	Form 4

How to read it

Buy, sale: Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan: A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after: The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value: Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

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