Insider · CIK 0001721580

Wang David H

Reports to the SEC for 1 company · FREMONT, CA

sec.gov

Transactions

Companies

Filings

CIK

0001721580

Forms 4 and 5

Insider transactions

50 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-09-09	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+70K sh	$1.00	+$70K	872,708
2026-09-09	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−33.5K sh	$73.80	−$2.47M	839,215
2026-09-09	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−18.9K sh	$74.67	−$1.41M	820,281
2026-09-09	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−11.7K sh	$75.58	−$882K	808,615
2026-09-09	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−4,807 sh	$76.73	−$369K	803,808
2026-09-09	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−1,100 sh	$77.59	−$85.3K	802,708
2026-09-09	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−70K sh	—	—	130,000
2026-09-08	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+70K sh	$1.00	+$70K	872,708
2026-09-08	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−4,803 sh	$75.99	−$365K	867,905
2026-09-08	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−51.4K sh	$77.15	−$3.96M	816,531
2026-09-08	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−12.3K sh	$78.08	−$962K	804,208
2026-09-08	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−1,500 sh	$78.57	−$118K	802,708
2026-09-08	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−70K sh	—	—	200,000
2026-06-04	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+40K sh	$1.00	+$40K	842,710
2026-06-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−2,060 sh	$83.86	−$173K	840,650
2026-06-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−17.5K sh	$85.11	−$1.49M	823,107
2026-06-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−11K sh	$86.07	−$946K	812,115
2026-06-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−8,581 sh	$87.13	−$748K	803,534
2026-06-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−826 sh	$87.91	−$72.6K	802,708
2026-06-04	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−40K sh	—	—	270,000
2026-06-03	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+60K sh	$1.00	+$60K	862,708
2026-06-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−4,300 sh	$87.57	−$377K	858,408
2026-06-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−6,295 sh	$88.98	−$560K	852,113
2026-06-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−32.5K sh	$89.84	−$2.92M	819,663
2026-06-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−9,925 sh	$90.78	−$901K	809,738
2026-06-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−5,843 sh	$92.38	−$540K	803,895
2026-06-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−1,187 sh	$93.04	−$110K	802,708
2026-06-03	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−60K sh	—	—	310,002
2026-05-13	ACMRACM Research, Inc. · Restricted Stock UnitsA Award	Director, See Remarks, 10% Owner	AAward	+6,208 sh	—	—	6,208
2026-03-12	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+50K sh	$1.00	+$50K	852,708
2026-03-12	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−10.6K sh	$44.92	−$474K	842,147
2026-03-12	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−38.7K sh	$45.74	−$1.77M	803,410
2026-03-12	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−702 sh	$46.57	−$32.7K	802,708
2026-03-12	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−50K sh	—	—	370,002
2026-03-11	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+60K sh	$1.00	+$60K	862,708
2026-03-11	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−55.4K sh	$47.89	−$2.65M	807,335
2026-03-11	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−4,627 sh	$48.34	−$224K	802,708
2026-03-11	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−60K sh	—	—	420,002
2026-02-04	ACMRACM Research, Inc. · Stock OptionA Award	Director, See Remarks, 10% Owner	AAward	+545K sh	—	—	1,636,197
2025-12-04	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+60K sh	$1.00	+$60K	862,708
2025-12-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−19.8K sh	$33.52	−$664K	842,891
2025-12-04	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−40.2K sh	$34.42	−$1.38M	802,708
2025-12-04	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−60K sh	—	—	480,002
2025-12-03	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+70K sh	$1.00	+$70K	872,708
2025-12-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−68.8K sh	$33.05	−$2.27M	803,908
2025-12-03	ACMRACM Research, Inc.S Sale	Director, See Remarks, 10% Owner	SSale	−1,200 sh	$33.56	−$40.3K	802,708
2025-12-03	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−70K sh	—	—	540,002
2025-10-27	ACMRACM Research, Inc. · Stock OptionA Award	Director, See Remarks, 10% Owner	AAward	+545K sh	—	—	545,400
2025-09-08	ACMRACM Research, Inc.M Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	+130K sh	$1.00	+$130K	802,708
2025-09-08	ACMRACM Research, Inc. · Stock OptionM Exercise/Conversion	Director, See Remarks, 10% Owner	MExercise/Conversion	−130K sh	—	—	610,002

Recent filings

Accepted (ET)
Sep 104
Wang David H0001140361-26-036191
SEC(opens sec.gov)
Jul 64
Wang David H0001140361-26-027691
SEC(opens sec.gov)
Jun 54
Wang David H0001140361-26-024280
SEC(opens sec.gov)

Companies

ACM Research, Inc.Director, See Remarks, 10% OwnerACMR

Address

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

FREMONT, CA, 94539