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ACMR · ACM Research, Inc.

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Market Cap
$5.18B
Shares
69.65M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 383
Total Value: $6,730,243,195
Total Shares: 53,016,558
Showing 1–100 of 403 holdings by value · page 1 of 5

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 383 13F filers · Δ vs Mar 31, 2026
Top Holder
16.3%
Sep 2023 → Jun 2026 · range 10.5% – 16.7%
−0.3 pts
Top 5
35.9%
Sep 2023 → Jun 2026 · range 32.0% – 40.4%
+1.9 pts
Top 10
48.5%
Sep 2023 → Jun 2026 · range 46.9% – 55.6%
+1.6 pts
HHI
443
Sep 2023 → Jun 2026 · range 367 – 522
Broadly held+7

Quarterly Activity

vs Mar 31, 2026
New
123
Increased
128
Decreased
95
Sold Out
46
Unchanged
37
Holder count: +77
Institutional value: +256.7%
Shares held: +10.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 403
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1680062 CUSIP 00108J109 13F (30d) 303 filings 297 filers Visit website Investor relations