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Disclosery

AMTM AMENTUM HOLDINGS INC

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Stock (common), issuer CIK 2011286

Filings received so far for Q3 2026: 18 13F filers report a position in AMTM shares at 2026-09-30. The quarter is not complete: its 13F deadline is 2026-11-14, and the counts grow as filings arrive.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2026

Filers in the available 13F reports with a share position at 2026-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
CACTI ASSET MANAGEMENT LLC875,097$15.9M0.84%-6,59513F-HRTimeline
SEGRA CAPITAL MANAGEMENT, LLC774,867$14M2.83%-1,263,02313F-HRTimeline
NEVILLE RODIE & SHAW INC21,464$389K0.03%-2213F-HRTimeline
CX Institutional7,771$141K<0.01%+7713F-HRTimeline
TOTH FINANCIAL ADVISORY CORP7,020$127K0.01%-11,20613F-HRTimeline
GAMMA Investing LLC4,569$82.8K<0.01%-38913F-HRTimeline
Farther Finance Advisors, LLC2,485$45K<0.01%-3613F-HRTimeline
CoreCap Advisors, LLC374$6.78K<0.01%+2313F-HRTimeline
ELEVATION WEALTH PARTNERS, LLC197$3.57K<0.01%-213F-HRTimeline
Versant Capital Management, Inc174$3.15K<0.01%+313F-HRTimeline
Roxbury Financial LLC118$2.14K<0.01%013F-HRTimeline
MassMutual Private Wealth & Trust, FSB109$1.98K<0.01%013F-HRTimeline
Grove Bank & Trust108$1.96K<0.01%013F-HRTimeline
Rosenberg Matthew Hamilton99$1.79K<0.01%013F-HRTimeline
GILPIN WEALTH MANAGEMENT, LLC86$1.56K<0.01%+6913F-HRTimeline
GK Wealth Management LLC29$525<0.01%new13F-HRTimeline
Marquette Asset Management, LLC25$453<0.01%new13F-HRTimeline
EASTERN BANK20$362<0.01%013F-HRTimeline