What does CUSIP 023939101 represent in this 13F holders report?

CUSIP 023939101 is the security identifier for AMTM - Amentum Holdings, Inc. - Common Stock used to aggregate holder disclosures.

How many institutions held AMTM - Amentum Holdings, Inc. - Common Stock in Q1 2026?

474 institutional investors reported AMTM - Amentum Holdings, Inc. - Common Stock for Q1 2026. Use the holders table for investor-level position and value details.

Amentum Holdings, Inc. - Common Stock (AMTM)

CUSIP: 023939101

Q1 2026 13F Holders as of 31 Mar 2026

Type / Class: Equity / Common Stock
Shares outstanding: 242,870,683
Total 13F shares: 201,560,057
Share change: +7,699,140
Total reported value: $5,256,638,912
Put/Call ratio: 48%
Price per share: $26.08
Number of holders: 474
Value change: +$187,595,267
Number of buys: 207
Number of sells: 207

Quarterly Holders Quick Answers

What is CUSIP 023939101?
CUSIP 023939101 identifies AMTM - Amentum Holdings, Inc. - Common Stock in SEC institutional holdings data.

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Previous quarter: Q4 2025

Recent filing periods for CUSIP 023939101:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024

Top shareholders of AMTM - Amentum Holdings, Inc. - Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
AMERICAN SECURITIES LLC	13F	Company	19%	45,026,743	$1,305,775,547	—	31 Dec 2025	13F
Alan E. Goldberg	13D/G 3/4/5	Director, 10%+ Owner	18%	43,893,904	$974,005,730	$0	17 Dec 2024	13D/G 3/4/5
ASP Manager Corp.	13D/G 3/4/5	10%+ Owner	18%	43,893,904	$974,005,730	$0	17 Dec 2024	13D/G 3/4/5
ASP Amentum Investco LP	3/4/5	10%+ Owner	— class O/S missing	43,893,904	$913,300,461	—	17 Dec 2024	3/4/5
Goldberg 2014 LLC	3/4/5	10%+ Owner	19%	45,026,743	$817,235,385	—	08 May 2025	3/4/5
Lindsay Goldberg Employee Co-Inv. IV L.P.	3/4/5	10%+ Owner	19%	45,026,743	$817,235,385	—	08 May 2025	3/4/5
Invesco Ltd.	13F	Company	9%	21,834,003	$633,186,097	—	31 Dec 2025	13F
BlackRock, Inc.	13F 13D/G	Company	6.9% from 13D/G	17,459,099	$506,313,859	—	31 Dec 2025	13F 13D/G
VANGUARD GROUP INC	13F	Company	6.3%	15,411,745	$446,940,605	—	31 Dec 2025	13F
PRIMECAP MANAGEMENT CO/CA/	13F	Company	5%	12,126,927	$351,680,883	—	31 Dec 2025	13F
FMR LLC	13F	Company	2.8%	6,707,304	$194,511,815	—	31 Dec 2025	13F
FRONTIER CAPITAL MANAGEMENT CO LLC	13F	Company	2.4%	5,772,976	$167,416,293	—	31 Dec 2025	13F
STATE STREET CORP	13F	Company	2.1%	5,061,620	$146,786,980	—	31 Dec 2025	13F
Focus Partners Wealth	13F	Company	1.2%	2,794,417	$81,038,102	—	31 Dec 2025	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	1.1%	2,659,364	$77,145,389	—	31 Dec 2025	13F
Ruane, Cunniff & Goldfarb L.P.	13F	Company	0.99%	2,394,129	$69,429,741	—	31 Dec 2025	13F
NORGES BANK	13F	Company	0.94%	2,294,097	$66,528,813	—	31 Dec 2025	13F
MORGAN STANLEY	13F	Company	0.85%	2,075,352	$60,185,252	—	31 Dec 2025	13F
THRIVENT FINANCIAL FOR LUTHERANS	13F	Company	0.85%	2,069,104	$60,004,000	—	31 Dec 2025	13F
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	13F	Company	0.81%	1,961,927	$56,895,904	—	31 Dec 2025	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.8%	1,952,002	$56,608,065	—	31 Dec 2025	13F
THOMPSON SIEGEL & WALMSLEY LLC	13F	Company	0.79%	1,921,809	$55,732,000	—	31 Dec 2025	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	0.75%	1,832,926	$53,156,787	—	31 Dec 2025	13F
Arvin Capital Management LP	13F	Company	0.67%	1,636,492	$47,458,268	—	31 Dec 2025	13F
COOPER CREEK PARTNERS MANAGEMENT LLC	13F	Company	0.64%	1,553,074	$45,039,000	—	31 Dec 2025	13F
AQR CAPITAL MANAGEMENT LLC	13F	Company	0.6%	1,452,049	$42,109,421	—	31 Dec 2025	13F
FIL Ltd	13F	Company	0.59%	1,429,384	$41,452,136	—	31 Dec 2025	13F
BRIGHTLINE CAPITAL MANAGEMENT, LLC	13F	Company	0.57%	1,392,000	$40,368,000	—	31 Dec 2025	13F
ExodusPoint Capital Management, LP	13F	Company	0.49%	1,184,186	$34,341,394	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.48%	1,157,427	$33,565,383	—	31 Dec 2025	13F
VOYA INVESTMENT MANAGEMENT LLC	13F	Company	0.47%	1,147,477	$33,276,833	—	31 Dec 2025	13F
LOOMIS SAYLES & CO L P	13F	Company	0.46%	1,118,930	$32,448,982	—	31 Dec 2025	13F
Steven J. Demetriou	3/4/5	Executive Chair, Director	0.35%	861,218 mixed-class rows	$30,888,441	—	17 Nov 2025	3/4/5
NORTHERN TRUST CORP	13F	Company	0.39%	952,977	$27,636,333	—	31 Dec 2025	13F
Bank of New York Mellon Corp	13F	Company	0.38%	922,097	$26,740,816	—	31 Dec 2025	13F
CACTI ASSET MANAGEMENT LLC	13F	Company	0.36%	881,692	$25,745,406	—	31 Dec 2025	13F
Verition Fund Management LLC	13F	Company	0.36%	865,172	$25,089,988	—	31 Dec 2025	13F
AVENIR CORP	13F	Company	0.35%	850,944	$24,677,376	—	31 Dec 2025	13F
683 Capital Management, LLC	13F	Company	0.34%	835,000	$24,215,000	—	31 Dec 2025	13F
Nuveen, LLC	13F	Company	0.34%	813,774	$23,599,446	—	31 Dec 2025	13F
Penn Capital Management Company, LLC	13F	Company	0.31%	743,937	$21,629,913	—	31 Dec 2025	13F
PRINCIPAL FINANCIAL GROUP INC	13F	Company	0.3%	728,414	$21,124,006	—	31 Dec 2025	13F
Point72 Asset Management, L.P.	13F	Company	0.29%	695,287	$20,163,323	—	31 Dec 2025	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.27%	644,158	$18,680,588	—	31 Dec 2025	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.26%	637,986	$18,501,594	—	31 Dec 2025	13F
Gotham Asset Management, LLC	13F	Company	0.26%	635,430	$18,427,470	—	31 Dec 2025	13F
SEGRA CAPITAL MANAGEMENT, LLC	13F	Company	0.25%	604,810	$17,539,490	—	31 Dec 2025	13F
NEW YORK STATE COMMON RETIREMENT FUND	13F	Company	0.22%	535,218	$15,521,322	—	31 Dec 2025	13F
VAN ECK ASSOCIATES CORP	13F	Company	0.22%	531,007	$15,399,000	—	31 Dec 2025	13F
PUBLIC SECTOR PENSION INVESTMENT BOARD	13F	Company	0.22%	530,566	$15,386,414	—	31 Dec 2025	13F

Institutional Holders of Amentum Holdings, Inc. - Common Stock (AMTM) as of Q1 2026

As of 31 Mar 2026, Amentum Holdings, Inc. - Common Stock (AMTM) was held by 474 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 201,560,057 shares. The largest 10 holders included AMERICAN SECURITIES LLC, Invesco Ltd., BlackRock, Inc., PRIMECAP MANAGEMENT CO/CA/, VANGUARD PORTFOLIO MANAGEMENT LLC, VANGUARD CAPITAL MANAGEMENT LLC, FMR LLC, STATE STREET CORP, FRONTIER CAPITAL MANAGEMENT CO LLC, and DIMENSIONAL FUND ADVISORS LP. This page lists 477 institutional shareholders reporting positions in this security for the Q1 2026 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

479

Q1 2026 holders

474

Holder diff

-5

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 Value $	Q1 2026 Value $	Value Diff $	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.