Public ownership evidence

Amentum Holdings, Inc. (AMTM) Ownership Disclosures

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

As of 2026-10-10T12:08:28.848Z

Recent Form 4 activity

No matching purchases, sales or awards were returned in this 90-day public filing window.

No records are available for this view.

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

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.

Cornerstone Financial Management LLC2026-03-312026-08-2916$417None
Corient Private Wealth LP2026-06-302026-08-2827,543$569,337None
Advisors Asset Management, Inc.2025-03-312026-08-2756,602$1,030,156None
Advisors Asset Management, Inc.2025-09-302026-08-2731,064$743,983None
AMERICAN SECURITIES LLC2026-06-302026-08-2745,026,743$930,702,778None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-03-312026-08-2619,400$505,952None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-2619,400$400,998None
Advisors Asset Management, Inc.2025-06-302026-08-2545,183$1,066,771None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25183,223$3,787,219None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-253,787,219$183,223,000None
Advisors Asset Management, Inc.2024-09-302026-08-2279,252$2,555,877None
Advisors Asset Management, Inc.2024-12-312026-08-2271,249$1,498,366None
Advisors Asset Management, Inc.2025-12-312026-08-2221,078$611,262None
CLIFFORD SWAN INVESTMENT COUNSEL LLC2026-06-302026-08-2117,389$359,431None
CLIFFORD SWAN INVESTMENT COUNSEL LLC2026-06-302026-08-21106$2,191None
Archer Investment Corp2026-06-302026-08-203$63None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2012,996$268,635None
Ensign Peak Advisors, Inc2026-03-312026-08-199,386$244,787None
Ensign Peak Advisors, Inc2025-12-312026-08-199,386$272,194None
Ensign Peak Advisors, Inc2025-09-302026-08-1929,986$718,165None
Parvin Asset Management, LLC2026-06-302026-08-18610$12,609None
Corient Private Wealth LP2026-06-302026-08-1831,354$648,089None
AWH Capital, L.P.2026-06-302026-08-18235,250$4,862,618None
Transamerica Financial Advisors, LLC2026-06-302026-08-181$20None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-1845,464$939,741None
SEI INVESTMENTS CO2026-06-302026-08-15181,406$3,749,667None
SEI INVESTMENTS CO2026-06-302026-08-158,663$179,130None
Murphy & Mullick Capital Management Corp2026-06-302026-08-15283$5,850None
Glen Eagle Advisors, LLC2026-06-302026-08-15184$3,803None
Federation des caisses Desjardins du Quebec2026-06-302026-08-15215$4,440None
Federation des caisses Desjardins du Quebec2026-06-302026-08-15307$6,346None
Advisors Asset Management, Inc.2026-06-302026-08-1553,517$1,106,196None
Basecamp Wealth Advisors LLC2026-06-302026-08-15399$8,247None
Advyzon Investment Management, LLC2026-06-302026-08-1510,228$211,413None
Quarry LP2026-06-302026-08-15139$2,873None
Ameritas Advisory Services, LLC2026-06-302026-08-1526,747$552,851None
Troluce Capital Advisors LLC2026-06-302026-08-153,565,399$73,696,797None
NFSG Corp2026-06-302026-08-151,350$27,905None
CSM Advisors, LLC2026-06-302026-08-15243,814$5,039,000None
Hel Ved Capital Management Ltd2026-06-302026-08-15214,000$4,423,380None
XTX Topco Ltd2026-06-302026-08-1552,938$1,094,228None
Prestige Wealth Management Group LLC2026-06-302026-08-1557$1,179None
Treasurer of the State of North Carolina2026-06-302026-08-1564,959$1,343,000None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-152,120,102$43,822,508None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-152,120,102$43,822,508None
ExodusPoint Capital Management, LP2026-06-302026-08-15226,289$4,677,394None
Qube Research & Technologies Ltd2026-06-302026-08-151,034,395$21,380,945None
Shay Capital LLC2026-06-302026-08-1517,500$361,725None
Caption Management, LLC2026-06-302026-08-1564,000$1,322,880None
Caption Management, LLC2026-06-302026-08-1550,000$1,033,500Put

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

Cornerstone Financial Management LLC ↗Corient Private Wealth LP ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗AMERICAN SECURITIES LLC ↗VIRGINIA RETIREMENT SYSTEMS ET Al ↗VIRGINIA RETIREMENT SYSTEMS ET Al ↗Advisors Asset Management, Inc. ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

No records are available for this view.

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.