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AMTM in the 13F filings

Amentum Holdings Inc · CUSIP 023939101

Sector · Business and payment services
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 5 Feb 2026
Managers listing it
28
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 7 listed it in both
Shares listed
37,584,661
combined, among listed positions
Reported value
$1.1bn
combined, at the quarter end

Among the 92 comparable managers: 15 buyers (opened or added shares) and 16 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,902,193.

Managers listing AMTM in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

28 of 28 holders

ActionFiling
Invesco Ltd21,834,003$633m0.06%Trimmed-282,83219 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)6,707,304$195munder 0.1%Added+472,05517 Feb 2026 (the filing on sec.gov)
Ruane Cunniff & Goldfarb LP2,394,129$69m1.08%Trimmed-29,61913 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC1,452,049$42munder 0.1%Added+1,286,84417 Feb 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP1,184,186$34m0.27%Added+1,077,99817 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC865,172$25m0.10%Trimmed-270,45413 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP695,287$20munder 0.1%Trimmed-685,70517 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP637,986$19munder 0.1%Added+238,86317 Feb 2026 (the filing on sec.gov)
Moore Capital Management LP475,314$14m0.20%Added+67,89717 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC267,999$7.8munder 0.1%Added+231,98917 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP157,077$4.6munder 0.1%Trimmed-2,09117 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc129,482$3.8munder 0.1%Added+11,30717 Feb 2026 (the filing on sec.gov)
Soros Fund Management LLC109,303$3.2munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Winton Group Ltd101,449$2.9m0.10%Added+48,04011 Feb 2026 (the filing on sec.gov)
GAMCO Investors Inc91,861$2.7munder 0.1%Trimmed-7,7825 Feb 2026 (the filing on sec.gov)
Holocene Advisors LP79,321$2.3munder 0.1%Added+33,50717 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP71,273$2.1munder 0.1%Trimmed-98,45317 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd69,400$2.0munder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Millennium Management LLC61,187$1.8munder 0.1%Trimmed-579,61217 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC55,585$1.6munder 0.1%Trimmed-62,38517 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP35,084$1.0munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP35,018$1.0munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP18,948$549kunder 0.1%Trimmed-74017 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC18,874$547kunder 0.1%Added+23727 Oct 2026 (the filing on sec.gov)
Bridgewater Associates LP18,251$529kunder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
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Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (5)

Exited (4)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
2 in Q3 2024 to 8 in Q2 2026

Tracked managers listing it, at least.

035810Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
AMTM by quarter
QuarterHoldersReported valueBuyersSellers
Q3 20242$82m20
Q4 20245$366m42
Q1 20258$479m62
Q2 20258$752m63
Q3 20259$738m35
Q4 20259$787m1516
Q1 202610$713m1712
Q2 20268$585m207

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

AMTM and V →AMTM and MA →AMTM and MCO →Choose a stock to compare with AMTM →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own AMTM, latest filings →Back to the 13F Explorer →