$ACMR

$50.96 +$0.41 (0.81%) Close

$ACMR Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 67.9M shares outstanding

Who owns ACMR?

By type of holder

Institutions 71.2% Insiders 0.0% Everyone else 28.8%

Concentration Top 10 holders own 35.9%

BlackRock, Inc. 12.8% · Vanguard Portfolio Management LLC 4.9%

Institutional ownership

71.2%

+5.8 pts vs last qtr

Institutional holders

375

+74 vs last qtr

Net shares bought

+3.9M

by institutions in Q2 2026

New / sold out

120 / 46

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Capital World Investors NEW +2.4M
Vanguard Portfolio Management LLC +1.1M

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −1.1M
WCM Investment Management, LLC −943.2K

Who is planning to sell?

Notices of proposed sale, last 12 months

$46.5M

25 notices from 8 people

Shares covered

888.6K

1.31% of the company

Arranged in advance

100%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Hui Wang Officer 10b5-1 $29M
Mark A Mckechnie Officer 10b5-1 $5.58M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2018–FY2025

+25.3%

+3.27% a year

Each share's claim on the business

−20.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$2.83M vs $136M

over 8 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years50% 3–5 years9% 1–3 years12% Under 1 year30%

Quarterly turnover

25.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ACMR on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	8.7M	12.76%	+676.0K (+8.5%)	≤2021	0.0%
Shares held by quarter Peak holding8.7M (Q2'26) Change over 8 quarters+4.2M Share of the company12.760% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	3.3M	4.93%	+1.1M (+52.0%)	≤2021	0.0%
Shares held by quarter Peak holding3.3M (Q2'26) Change over 8 quarters+3.3M Share of the company4.930% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

8.7M

% of company

12.76%

Change vs last qtr

+676.0K (+8.5%)

Held since

≤2021

Vanguard Portfolio Management LLC

3.3M

% of company

4.93%

Change vs last qtr

+1.1M (+52.0%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding ACM Research, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ACMR on Form N-PORT; together they hold 38.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$436M	3.4M	5.06%	0.39%	June 30, 2026
SW SMALLCAP World Fund Inc SMALLCAP World Fund Inc	$371M	2.9M	4.31%	0.39%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$436M

% of company

5.06%

% of the fund

0.39%

As of

June 30, 2026

SMALLCAP World Fund Inc

Position value

$371M

% of company

4.31%

% of the fund

0.39%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding ACM Research, Inc. and how much of the fund the position is.

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