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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 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
27
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 8 listed it in both
Shares listed
36,044,533
combined, among listed positions
Reported value
$940m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 17 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,383,051.

Managers listing AMTM in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

27 of 27 holders

ActionFiling
Invesco Ltd21,473,778$560m0.05%Trimmed-360,22512 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)5,578,386$145munder 0.1%Trimmed-1,128,91815 May 2026 (the filing on sec.gov)
Point72 Asset Management LP1,630,563$43m0.05%Added+935,27615 May 2026 (the filing on sec.gov)
Ruane Cunniff & Goldfarb LP1,622,982$42m0.70%Trimmed-771,14715 May 2026 (the filing on sec.gov)
Verition Fund Management LLC1,297,946$34m0.22%Added+432,77415 May 2026 (the filing on sec.gov)
Two Sigma Investments LP900,177$23munder 0.1%Added+262,19115 May 2026 (the filing on sec.gov)
Moore Capital Management LP873,610$23m0.46%Added+398,29615 May 2026 (the filing on sec.gov)
Millennium Management LLC631,055$16munder 0.1%Added+569,86815 May 2026 (the filing on sec.gov)
AQR Capital Management LLC507,843$13munder 0.1%Trimmed-944,20615 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP330,049$8.6munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Jane Street Group LLC191,979$5.0munder 0.1%Added+181,17012 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc145,253$3.8munder 0.1%Added+15,77115 May 2026 (the filing on sec.gov)
Holocene Advisors LP123,197$3.2munder 0.1%Added+43,87615 May 2026 (the filing on sec.gov)
Soros Fund Management LLC107,606$2.8munder 0.1%Trimmed-1,69715 May 2026 (the filing on sec.gov)
GAMCO Investors Inc95,331$2.5munder 0.1%Added+3,47014 May 2026 (the filing on sec.gov)
AllianceBernstein LP73,806$2.1munder 0.1%Added+2,53315 May 2026 (the filing on sec.gov)
Citadel Advisors LLC80,638$2.1munder 0.1%Added+25,05315 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP77,196$2.0munder 0.1%Added+42,17815 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd69,400$1.8munder 0.1%Held018 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.66,171$1.7munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Winton Group Ltd55,500$1.4m0.05%Trimmed-45,94912 May 2026 (the filing on sec.gov)
Maverick Capital Ltd46,335$1.2munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC20,551$536kunder 0.1%Added+1,67727 Oct 2026 (the filing on sec.gov)
Balyasny Asset Management LLC18,345$478kunder 0.1%Trimmed-249,65415 May 2026 (the filing on sec.gov)
Bridgewater Associates LP17,052$445kunder 0.1%Trimmed-1,19915 May 2026 (the filing on sec.gov)
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Largest increases and reductions, by shares

Q4 2025 to Q1 2026, 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 (3)

Exited (3)

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 →