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Public ownership evidence

ACM Research, Inc. Class A Common Stock (ACMR) Ownership Disclosures

Read ACMR insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-11-07T14:03:26.246Z

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2026-11-072026-10-01Ma Yue NMNA13,470Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-10-01 and its public availability date is 2026-11-07. Subtracting those calendar dates gives 37 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code A: a award. An award is an acquisition but is not an open-market purchase. A purchase-following rule must not count it as code P.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001140361-26-042540 ↗SEC 0001140361-26-042540 ↗SEC 0001140361-26-036191 ↗

Recent Form 4 activity

Inspect all 23 displayed rows: Recent Form 4 activity

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2026-11-072026-10-01Ma Yue NMNA13,470Not reported
2026-11-072026-10-01Ma Yue NMNA100,000Not reported
2026-09-102026-09-09Wang David HS11,666Not reported
2026-09-102026-09-09Wang David HS18,934Not reported
2026-09-102026-09-09Wang David HS33,493Not reported
2026-09-102026-09-08Wang David HS1,500Not reported
2026-09-102026-09-08Wang David HS12,323Not reported
2026-09-102026-09-08Wang David HS51,374Not reported
2026-09-102026-09-08Wang David HS4,803Not reported
2026-09-102026-09-09Wang David HS1,100Not reported
2026-09-102026-09-09Wang David HS4,807Not reported
2026-08-272026-08-12Pappis Charles CA728Not reported
2026-08-272026-08-12Pappis Charles CA6,400Not reported
2026-08-272026-08-12Liu TracyA728Not reported
2026-08-272026-08-12Liu TracyA6,400Not reported
2026-08-272026-08-12Dun HaipingA728Not reported
2026-08-272026-08-12Dun HaipingA6,400Not reported
2026-08-222026-08-20McKechnie MarkS11,209Not reported
2026-08-222026-08-20McKechnie MarkS30,365Not reported
2026-08-222026-08-20McKechnie MarkS13,625Not reported
2026-08-212026-08-18Dun HaipingS400Not reported
2026-08-212026-08-18Dun HaipingS3,400Not reported
2026-08-212026-08-18Dun HaipingS1,200Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 50 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Cornerstone Financial Management LLC2026-06-302026-08-2969$8,755None
Cornerstone Financial Management LLC2026-03-312026-08-2969$2,715None
Cornerstone Financial Management LLC2025-12-312026-08-2969$2,722None
Advisors Asset Management, Inc.2025-03-312026-08-2796$2,241None
Advisors Asset Management, Inc.2025-09-302026-08-2780$3,130None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-264,900$621,761None
Advisors Asset Management, Inc.2025-06-302026-08-2593$2,409None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2559,702$7,575,587None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-257,575,587$59,702,000None
Advisors Asset Management, Inc.2024-09-302026-08-2254$1,096None
Advisors Asset Management, Inc.2024-12-312026-08-22102$1,540None
Advisors Asset Management, Inc.2025-12-312026-08-22548$21,619None
Bullock Wealth Management Group2026-06-302026-08-20279$32,688None
SPX Gestao de Recursos Ltda2026-06-302026-08-2013,815$1,752,985None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-205,349$678,735None
Ensign Peak Advisors, Inc2026-03-312026-08-194,564$179,593None
Ensign Peak Advisors, Inc2025-12-312026-08-194,564$180,050None
Ensign Peak Advisors, Inc2025-09-302026-08-1911,514$450,543None
Value Aligned Research Advisors, LLC2026-06-302026-08-18100$12,689Call
Value Aligned Research Advisors, LLC2026-06-302026-08-181,053,949$133,735,589None
Empowered Funds, LLC2026-06-302026-08-181,802$228,656None
Odyssean, LLC2026-06-302026-08-1519,180$2,433,750None
DARK FOREST CAPITAL MANAGEMENT LP2026-06-302026-08-153,657$464,037None
Kultura Capital Management LP2026-06-302026-08-1537,725$4,786,925None
Graham Capital Management, L.P.2026-06-302026-08-154,500$571,005None
SEI INVESTMENTS CO2026-06-302026-08-1521,485$2,726,232None
SEI INVESTMENTS CO2026-06-302026-08-1518,828$2,389,090None
Massar Capital Management, LP2026-06-302026-08-154,952$628,359None
Advisors Asset Management, Inc.2026-06-302026-08-152,628$333,467None
SHELTON CAPITAL MANAGEMENT2026-06-302026-08-151,651$209,495None
Marex Group Ltd2026-06-302026-08-156,294$798,646None
Marex Group Ltd2026-06-302026-08-154,930$625,568None
Nemes Rush Group LLC2026-06-302026-08-151,500$190,335None
Quarry LP2026-06-302026-08-1511$1,396None
MY.Alpha Management HK Advisors Ltd2026-06-302026-08-15249,500$31,659,055None
Cederberg Capital Ltd2026-06-302026-08-15254,669$32,315,000None
Militia Capital Partners, LP2025-03-312026-08-1521,689$506,221None
XTX Topco Ltd2026-06-302026-08-1512,528$1,589,678None
Aquatic Capital Management LLC2026-06-302026-08-1516,800$2,131,752None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15526,760$66,840,576None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15526,760$66,840,576None
Qube Research & Technologies Ltd2026-06-302026-08-15280,015$35,531,103None
Diametric Capital, LP2026-06-302026-08-1516,808$2,132,767None
OSAIC HOLDINGS, INC.2026-06-302026-08-1528$3,553None
OSAIC HOLDINGS, INC.2026-06-302026-08-153,308$419,752None
OSAIC HOLDINGS, INC.2026-06-302026-08-1525,907$3,287,132None
Squarepoint Ops LLC2026-06-302026-08-156,100$774,029Call
Squarepoint Ops LLC2026-06-302026-08-153,300$418,737Put
Steamboat Capital Partners, LLC2026-06-302026-08-15182,773$23,192,066None
MetLife Investment Management, LLC2026-06-302026-08-1531,382$3,982,062None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗VIRGINIA RETIREMENT SYSTEMS ET Al ↗Advisors Asset Management, Inc. ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Advisors Asset Management, Inc. ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.