Amentum Holdings, Inc. - Common Stock (AMTM)

Historical Holders from Q3 2024 to Q4 2025

Type / Class
Equity / Common Stock
Symbol
AMTM on NYSE
Shares outstanding
243,042,143
Price per share
$29.00
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
193,316,617
Total reported value
$4,628,701,660
% of total 13F portfolios
0.01%
Share change
-6,951,134
Value change
-$164,762,598
Number of holders
451
Price from insider filings
$29.00
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Amentum Holdings, Inc. - Common Stock (AMTM) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
GOLDBERG ALAN E 18% $974,005,730 43,893,904 Alan E. Goldberg 17 Dec 2024
ASP Manager Corp. 18% $974,005,730 43,893,904 ASP Manager Corp. 17 Dec 2024
Invesco Ltd. 9.1% +29% $529,698,198 +$117,971,114 22,116,835 +29% Invesco Ltd. 30 Sep 2025
BlackRock, Inc. 6.9% $372,220,408 16,774,241 BlackRock, Inc. 31 Dec 2024
VANGUARD GROUP INC 6.8% $367,076,899 16,542,447 The Vanguard Group 31 Dec 2024
As of 30 Sep 2025, Amentum Holdings, Inc. - Common Stock (AMTM) has 451 institutional shareholders filing 13F forms. They hold 193,316,617 shares. of 243,042,143 outstanding shares (80%) .

Top 25 institutional shareholders own 67% of the company.

Filer Ownership Nb Shares Share Change % Portfolio % Holdings Value
AMERICAN SECURITIES LLC 19% 45,026,743 0% 100% $1,078,390,495
Invesco Ltd. 9.1% 22,116,835 +13% 0.08% $529,698,190
BlackRock, Inc. 7.4% 17,990,449 -5.3% 0.01% $430,871,245
VANGUARD GROUP INC 6.4% 15,554,691 -5.9% 0.01% $372,534,850
PRIMECAP MANAGEMENT CO/CA/ 4.9% 11,918,586 -0.93% 0.22% $285,450,135
STATE STREET CORP 2.8% 6,833,376 -3.5% 0.01% $163,659,355
FMR LLC 2.6% 6,235,249 +36% 0.01% $149,334,229
FRONTIER CAPITAL MANAGEMENT CO LLC 2.1% 5,202,680 -4.7% 1.1% $124,604,180
Kovitz Investment Group Partners, LLC 1.2% 3,007,750 +0.24% 0.28% $72,035,613
THOMPSON SIEGEL & WALMSLEY LLC 1.1% 2,730,298 -2% 1.1% $65,391,000
GEODE CAPITAL MANAGEMENT, LLC 1.1% 2,654,184 +5.6% 0% $63,585,408
Ruane, Cunniff & Goldfarb L.P. 1% 2,423,748 -0.74% 0.96% $58,048,765
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.86% 2,081,611 +51% 0.08% $49,854,548
Freestone Grove Partners LP 0.84% 2,051,859 0% 0.37% $49,142,023
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.76% 1,842,171 +5.6% 0.01% $44,119,995
MORGAN STANLEY 0.74% 1,806,417 -17% 0% $43,263,752
Thrivent Financial for Lutherans 0.74% 1,805,411 +7% 0.09% $43,240,000
Arvin Capital Management LP 0.67% 1,636,492 -24% 9.1% $39,193,983
FIL Ltd 0.64% 1,559,024 -25% 0.03% $37,338,625
Point72 Asset Management, L.P. 0.57% 1,380,992 +294% 0.07% $33,074,757
DIMENSIONAL FUND ADVISORS LP 0.54% 1,306,051 -2.2% 0.01% $31,272,642
683 Capital Management, LLC 0.52% 1,275,000 -22% 2.8% $30,536,250
BRIGHTLINE CAPITAL MANAGEMENT, LLC 0.49% 1,200,000 +20% 12% $28,740,000
DISCOVERY CAPITAL MANAGEMENT, LLC / CT 0.47% 1,139,112 -50% 1.5% $27,281,732
Verition Fund Management LLC 0.47% 1,135,626 +1128% 0.16% $27,198,243

Institutional Holders of Amentum Holdings, Inc. - Common Stock (AMTM) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price Investors
2025 Q4 1,469,691 $43,191,709 +$10,381,337 $29.00 24
2025 Q3 193,316,617 $4,628,701,660 -$164,762,598 $23.95 451
2025 Q2 200,286,307 $4,728,932,149 +$283,438,102 $23.61 449
2025 Q1 189,918,108 $3,456,762,603 +$424,243,410 $18.20 410
2024 Q4 180,057,223 $3,789,816,275 +$1,468,894,480 $21.03 445
2024 Q3 99,712,565 $3,204,357,186 +$2,913,258,016 $32.25 480