AMTM — Amentum Holdings, Inc.

Ownership history in AMERICAN SECURITIES LLC  ·  8 quarters on record

This page tracks every 13F SEC filing in which AMERICAN SECURITIES LLC reported a position in Amentum Holdings, Inc. (AMTM). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
100.0% (2012 Q4)
Avg. % of fund
100.0%
First filed
2012 Q4
Last filed
2025 Q4
Quarters held
8
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 UNCHANGED 45,026,743 — 0% 100.00% $1.31B $29.00
2025 Q3 UNCHANGED 45,026,743 — 0% 100.00% $1.08B $23.95
2025 Q2 ADDED 45,026,743 +1,132,839 +2.6% 100.00% $1.06B $23.61
2025 Q1 REDUCED 43,893,904 -1,132,839 -2.5% 100.00% $798.9M $18.20
4 older quarters hidden  —  Sign in free or upgrade to Premium to see full history
% of Fund (quarterly)    AMTM price (monthly, adj. close)

Other funds also holding AMTM

As of 2025 Q4 — sorted by position size

BRIGHTLINE CAPITAL MANAGEMENT, LLC 3Y 7Y 16.32% SEGRA CAPITAL MANAGEMENT, LLC 3Y 12.43% Arvin Capital Management LP 8.94% Hyperion Capital Advisors LP 3Y 6.98% AWH Capital, L.P. 3Y 7Y 6.29% GRIZZLYROCK CAPITAL, LLC 6.19% AVENIR CORP 3Y 7Y 2.68% Soviero Asset Management, LP 3Y 2.47% COOPER CREEK PARTNERS MANAGEMENT LLC 3Y 7Y 2.03% FRONTIER CAPITAL MANAGEMENT CO LLC 3Y 7Y 1.78%
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