ACM Research, Inc.

Historical 13F Holders

Reported Value, Excluding Options

Total Filings

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for 00108J109 since 12/18/2024, largest first.

Filer	% of Class	Shares	Form	Filed
BlackRock, Inc. 13G/A	12.6%	7,420,308	13G/A	10/2/2025 Event 9/30/2025
Vanguard Portfolio Management LLC 13G	5.3%	3,405,116	13G	7/31/2026 Event 6/30/2026
Under 5%, checked the "5 percent or less" box, or amended by a later filing (2)
Yiheng Capital Management, L.P. 13G/A	1.2%	666,304	13G/A	11/13/2024 Event 9/30/2024
Yiheng Capital Partners, L.P.	1.2%	666,304
Yiheng Capital, LLC	1.2%	666,304
Yiheng Capital Management, LP	1.2%	666,304
Yuanshan Guo	1.2%	666,304
Vanguard Group Inc 13G/A	0%	0	13G/A	3/26/2026 Event 3/13/2026

Period	Filings	Shares, Excl. Options	Value, Excl. Options	Options Value
2026 Q3	65	1.52 M	$63.4 M	$0
2026 Q2	409	56.2 M	$6.11 B	$576 M
2026 Q1	323	44.4 M	$1.74 B	$140 M
2025 Q4	309	45.3 M	$1.79 B	$201 M
2025 Q3	293	41.8 M	$1.64 B	$262 M
2025 Q2	273	37.5 M	$972 M	$109 M
2025 Q1	271	35.9 M	$839 M	$88.8 M
2024 Q4	202	35.7 M	$539 M	$37.4 M
2024 Q3	206	32.5 M	$660 M	$43.3 M
2024 Q2	227	35.6 M	$820 M	$46.1 M
2024 Q1	224	35.9 M	$1.05 B	$43.9 M
2023 Q4	175	35.0 M	$683 M	$27.0 M
2023 Q3	170	31.1 M	$563 M	$23.2 M
2023 Q2	134	29.3 M	$383 M	$17.8 M
2023 Q1	143	29.4 M	$344 M	$29.1 M
2022 Q4	138	31.4 M	$242 M	$8.70 M
2022 Q3	134	35.0 M	$436 M	$25.3 M
2022 Q2	114	36.3 M	$610 M	$11.5 M
2022 Q1	113	29.3 M	$607 M	$46.3 M
2021 Q4	119	8.80 M	$751 M	$26.9 M
2021 Q3	113	8.91 M	$980 M	$150 M
2021 Q2	113	7.37 M	$753 M	$123 M
2021 Q1	112	7.26 M	$587 M	$92.5 M
2020 Q4	115	5.61 M	$456 M	$37.2 M
2020 Q3	107	5.16 M	$357 M	$83.0 M
2020 Q2	106	4.96 M	$310 M	$54.7 M
2020 Q1	71	3.82 M	$113 M	$3.37 M
2019 Q4	48	3.03 M	$55.9 M	$0
2019 Q3	49	2.92 M	$40.5 M	$0
2019 Q2	41	1.75 M	$27.2 M	$0
2019 Q1	31	1.47 M	$22.6 M	$0
2018 Q4	30	1.64 M	$17.8 M	$0
2018 Q3	33	1.70 M	$18.8 M	$0
2018 Q2	35	1.77 M	$19.1 M	$0
2018 Q1	13	853 k	$10.5 M	$0
2017 Q4	10	874 k	$4.57 M	$0