ACM Research, Inc. - Common Stock (ACMR) Institutional Ownership

13F Institutional Holders and Ownership History from Q4 2017 to Q4 2025

Type / Class: Equity / Common Stock
Symbol: ACMR on Nasdaq
Shares outstanding: 59,904,855
Price per share: $54.68
All holders as of 31 Dec 2025: Q4 2025
Total 13F shares: 43,537,910
Total reported value: $1,718,527,060
% of total 13F portfolios: 0.01%
Share change: +2,244,557
Value change: +$89,169,983
Number of holders: 264
Price from insider filings: $54.68

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Significant Owners of ACM Research, Inc. - Common Stock (ACMR) based on Schedule 13D/G filings

Filer	Ownership	Change %	Holdings Value	Net Change	Nb Shares	Change %	Reporting Name	Report Period
BlackRock, Inc.	13%	+86%	$200,125,707	+$96,872,680	7,420,308	+94%	BlackRock, Inc.	30 Sep 2025
VANGUARD GROUP INC	8.3%		$196,149,961		4,972,103		The Vanguard Group	31 Dec 2025
Yiheng Capital Management, L.P.	1.2%		$14,145,634		666,304		Yiheng Capital Partners, L.P.	30 Sep 2024

As of 31 Dec 2025, 264 institutional investors reported holding 43,537,910 shares of ACM Research, Inc. - Common Stock (ACMR). This represents 73% of the company’s total 59,904,855 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of ACM Research, Inc. - Common Stock (ACMR) together control 55% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution	Ownership %	Shares Held	Share Change %	Portfolio %	Holdings Value
BlackRock, Inc.	13%	7,888,480	+4%	0.01%	$311,200,536
VANGUARD GROUP INC	8.3%	4,972,103	+2.6%	0%	$196,149,463
LSV ASSET MANAGEMENT	4%	2,380,521	-4.9%	0.2%	$93,912,000
STATE STREET CORP	3.3%	1,958,041	-1.6%	0%	$77,244,717
Triata Capital Ltd	3.2%	1,929,919	-3.7%	9.2%	$76,135,305
SOUTHEASTERN ASSET MANAGEMENT INC/TN/	2.8%	1,680,181	+13%	3%	$66,283,140
MORGAN STANLEY	2.3%	1,392,306	+59%	0%	$54,926,494
GEODE CAPITAL MANAGEMENT, LLC	2.2%	1,342,899	+1.5%	0%	$52,986,097
JANUS HENDERSON GROUP PLC	1.8%	1,082,982	+1406%	0.02%	$42,739,885
Mitsubishi UFJ Trust & Banking Corp	1.4%	829,127	-39%	0.08%	$32,721,497
FMR LLC	1.3%	803,666	+224%	0%	$31,704,614
Tekne Capital Management, LLC	1.2%	715,000		10%	$28,206,750
Cederberg Capital Ltd	1.2%	693,900	+40%	8.9%	$27,374,000
Broad Bay Capital Management, LP	1.1%	652,214	-36%	2.9%	$25,729,842
NORTHERN TRUST CORP	0.91%	544,059	-7.3%	0%	$21,463,127
UBS Group AG	0.85%	510,315	-13%	0%	$20,131,927
Steamboat Capital Partners, LLC	0.84%	504,161	-4%	5.5%	$19,889,151
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.8%	478,333	+9.4%	0%	$18,870,237
Penn Capital Management Company, LLC	0.73%	435,843		1.4%	$17,212,421
Raiffeisen Bank International AG	0.73%	435,000	0%	0.23%	$17,487,000
PRINCIPAL FINANCIAL GROUP INC	0.64%	383,129	+14%	0.01%	$15,114,440
GOLDMAN SACHS GROUP INC	0.6%	361,588	-46%	0%	$14,264,647
Nearwater Capital Markets, Ltd	0.59%	350,800		0.24%	$13,839,060
AQR CAPITAL MANAGEMENT LLC	0.57%	343,603	-3.7%	0.01%	$13,555,139
WEXFORD CAPITAL LP	0.56%	335,003	+80%	3.4%	$13,215,870

Institutional Holders of ACM Research, Inc. - Common Stock (ACMR) across Reporting Periods

Period	Reported Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (Median)	Investors
2025 Q4	43,537,910	$1,718,527,060	+$89,169,983	$60,113,910	$103,781,115	$39.45	264
2025 Q3	41,774,346	$1,634,589,946	+$211,345,365	$80,203,480	$119,357,581	$39.13	256
2025 Q2	37,392,485	$968,631,098	+$59,232,869	$50,846,080	$40,654,598	$25.90	239
2025 Q1	35,841,980	$837,275,246	+$17,599,939	$38,267,447	$50,026,032	$23.34	239
2024 Q4	35,668,005	$538,575,863	+$1,582,438	$23,122,025	$14,123,803	$15.10	177
2024 Q3	32,339,282	$656,856,262	-$37,712,927	$18,577,010	$24,502,048	$20.30	181
2024 Q2	33,508,121	$772,714,047	+$5,942,475	$26,182,324	$19,967,654	$23.06	195
2024 Q1	32,763,159	$954,762,451	+$25,181,100	$20,022,094	$23,897,714	$29.14	194
2023 Q4	32,892,829	$642,774,193	+$39,830,721	$6,981,642	$19,999,282	$19.54	154
2023 Q3	31,082,900	$562,774,649	+$38,989,842	$6,381,456	$16,842,303	$18.10	153
2023 Q2	29,261,051	$382,648,185	+$726,292	$1,872,126	$15,940,176	$13.08	121
2023 Q1	29,370,632	$343,635,569	+$920,863	$5,613,630	$23,478,450	$11.70	128
2022 Q4	30,422,642	$234,556,379	-$60,173,329	$1,540,502	$7,158,748	$7.71	120
2022 Q3	34,915,788	$435,076,889	-$23,398,496	$4,292,000	$21,011,000	$12.46	113
2022 Q2	36,066,144	$606,711,091	+$101,866,278	$6,740,000	$4,716,000	$16.83	98
2022 Q1	29,321,200	$606,652,154	+$405,127,320	$24,164,000	$22,164,000	$20.69	95
2021 Q4	8,766,331	$747,439,596	-$36,495,630	$15,264,000	$7,274,000	$85.27	99
2021 Q3	8,908,016	$979,616,110	+$172,129,886	$101,379,000	$48,252,000	$110.00	94
2021 Q2	7,370,254	$753,404,436	+$22,572,688	$31,937,000	$90,685,000	$102.22	93
2021 Q1	7,259,073	$586,489,643	+$146,266,911	$70,734,000	$21,739,000	$80.79	92
2020 Q4	5,443,661	$442,291,701	+$12,069,420	$12,899,000	$14,093,000	$81.25	91
2020 Q3	5,159,767	$356,662,075	+$26,674,819	$64,706,000	$18,328,000	$69.10	87
2020 Q2	4,964,007	$309,515,964	+$77,613,417	$44,240,000	$10,500,000	$62.36	83
2020 Q1	3,818,506	$113,063,847	+$39,231,858	$2,402,000	$965,000	$29.61	61
2019 Q4	2,963,810	$54,685,221	+$2,169,281			$18.45	44
2019 Q3	2,923,158	$40,506,857	+$8,790,813			$13.86	46
2019 Q2	1,745,428	$27,238,673	+$4,238,707			$15.61	36
2019 Q1	1,464,505	$22,588,512	-$391,231			$15.42	28
2018 Q4	1,558,409	$16,945,000	-$1,305,490			$10.87	27
2018 Q3	1,679,926	$18,592,328	-$790,077			$11.07	31
2018 Q2	1,754,578	$18,915,000	+$9,677,053			$10.78	34
2018 Q1	849,051	$10,442,000	+$324,928			$12.30	11
2017 Q4	873,847	$4,571,000	+$4,571,000			$5.25	10