Insider · CIK 0001721581

Dun Haiping

Reports to the SEC for 1 company · FREMONT, CA

sec.gov

Transactions

Companies

Filings

CIK

0001721581

Forms 4 and 5

Insider transactions

50 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-08-18	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+5,000 sh	$5.60	+$28K	5,000
2026-08-18	ACMRACM Research, Inc.S Sale	Director	SSale	−3,400 sh	$81.31	−$276K	400
2026-08-18	ACMRACM Research, Inc.S Sale	Director	SSale	−400 sh	$82.17	−$32.9K	0
2026-08-18	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−5,000 sh	—	—	45,000
2026-08-18	ACMRACM Research, Inc.S Sale	Director	SSale	−1,200 sh	$80.29	−$96.3K	3,800
2026-08-12	ACMRACM Research, Inc. · Stock OptionA Award	Director	AAward	+6,400 sh	—	—	6,400
2026-08-12	ACMRACM Research, Inc. · Restricted Stock UnitsA Award	Director	AAward	+728 sh	—	—	728
2026-05-19	ACMRACM Research, Inc.S Sale	Director	SSale	−1,858 sh	$67.54	−$125K	0
2026-05-19	ACMRACM Research, Inc.S Sale	Director	SSale	−1,333 sh	$63.84	−$85.1K	3,667
2026-05-19	ACMRACM Research, Inc.S Sale	Director	SSale	−500 sh	$65.09	−$32.5K	3,167
2026-05-19	ACMRACM Research, Inc.S Sale	Director	SSale	−1,309 sh	$67.21	−$88K	1,858
2026-05-19	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−5,000 sh	—	—	50,000
2026-05-19	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+5,000 sh	$5.60	+$28K	5,000
2026-03-09	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+5,000 sh	$5.60	+$28K	5,000
2026-03-09	ACMRACM Research, Inc.S Sale	Director	SSale	−900 sh	$43.94	−$39.5K	0
2026-03-09	ACMRACM Research, Inc.S Sale	Director	SSale	−4,100 sh	$43.37	−$178K	900
2026-03-09	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−5,000 sh	—	—	55,000
2025-11-12	ACMRACM Research, Inc.G Gift	Director	GGift	−755K sh	—	—	0
2025-08-12	ACMRACM Research, Inc. · Stock OptionA Award	Director	AAward	+20K sh	—	—	20,000
2025-03-14	ACMRACM Research, Inc.S Sale	Director	SSale	−2,456 sh	$28.32	−$69.6K	762,152
2025-03-14	ACMRACM Research, Inc.S Sale	Director	SSale	−7,062 sh	$29.23	−$206K	755,090
2025-03-10	ACMRACM Research, Inc.S Sale	Director	SSale	−15K sh	$26.54	−$398K	764,608
2025-03-03	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+25K sh	$0.50	+$12.5K	780,091
2025-03-03	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−25K sh	—	—	0
2025-03-03	ACMRACM Research, Inc.F Tax Payment	Director	FTax Payment	−482 sh	$25.94	−$12.5K	779,609
2024-11-29	ACMRACM Research, Inc.S Sale	Director	SSale	−19.1K sh	$17.43	−$332K	755,090
2024-11-22	ACMRACM Research, Inc.S Sale	Director	SSale	−15K sh	$19.12	−$287K	774,148
2024-11-14	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−35K sh	—	—	25,001
2024-11-14	ACMRACM Research, Inc.F Tax Payment	Director	FTax Payment	−942 sh	$18.59	−$17.5K	789,148
2024-11-14	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+35K sh	$0.50	+$17.5K	790,090
2024-08-29	ACMRACM Research, Inc.S Sale	Director	SSale	−19.1K sh	$18.08	−$345K	755,090
2024-08-22	ACMRACM Research, Inc.S Sale	Director	SSale	−15K sh	$19.85	−$298K	774,187
2024-08-14	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−35K sh	—	—	60,001
2024-08-14	ACMRACM Research, Inc.F Tax Payment	Director	FTax Payment	−903 sh	$19.38	−$17.5K	789,187
2024-08-14	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+35K sh	$0.50	+$17.5K	790,090
2024-08-12	ACMRACM Research, Inc. · Stock OptionA Award	Director	AAward	+20K sh	—	—	20,000
2024-06-27	ACMRACM Research, Inc.G Gift	Director	GGift	−300K sh	—	—	0
2024-06-27	ACMRACM Research, Inc.G Gift	Director	GGift	−100K sh	—	—	755,090
2024-05-29	ACMRACM Research, Inc.S Sale	Director	SSale	−19.2K sh	$22.63	−$435K	855,090
2024-05-22	ACMRACM Research, Inc.S Sale	Director	SSale	−15K sh	$22.88	−$343K	874,329
2024-05-14	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+35K sh	$0.50	+$17.5K	890,090
2024-05-14	ACMRACM Research, Inc.F Tax Payment	Director	FTax Payment	−761 sh	$23.02	−$17.5K	889,329
2024-05-14	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−35K sh	—	—	95,001
2024-03-14	ACMRACM Research, Inc.S Sale	Director	SSale	−15.9K sh	$27.56	−$438K	858,647
2024-03-14	ACMRACM Research, Inc.S Sale	Director	SSale	−3,557 sh	$28.34	−$101K	855,090
2024-03-08	ACMRACM Research, Inc.S Sale	Director	SSale	−15K sh	$30.36	−$455K	874,524
2024-03-01	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director	MExercise/Conversion	−35K sh	—	—	130,001
2024-03-01	ACMRACM Research, Inc.M Exercise/Conversion	Director	MExercise/Conversion	+35K sh	$0.50	+$17.5K	890,090
2024-03-01	ACMRACM Research, Inc.F Tax Payment	Director	FTax Payment	−566 sh	$30.92	−$17.5K	889,524
2023-11-29	ACMRACM Research, Inc.S Sale	Director	SSale	−19K sh	$17.25	−$327K	855,090

Recent filings

Accepted (ET)
Aug 264
Dun Haiping0001140361-26-034526
SEC(opens sec.gov)
Aug 204
Dun Haiping0001140361-26-033892
SEC(opens sec.gov)
May 214
Dun Haiping0001140361-26-022458
SEC(opens sec.gov)
Mar 114
Dun Haiping0001140361-26-009039
SEC(opens sec.gov)
Nov 144
Dun Haiping0001140361-25-042348
SEC(opens sec.gov)
Aug 144
Dun Haiping0001140361-25-031257
SEC(opens sec.gov)
Mar 184
Dun Haiping0001140361-25-009327
SEC(opens sec.gov)

Companies

ACM Research, Inc.DirectorACMR

Address

C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I

FREMONT, CA, 94539