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AMTM · Amentum Holdings, Inc. · Holdings

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Market Cap
$4.85B
Shares
244.51M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 465
Total Value: $4,581,809,160
Total Shares: 221,903,738
Showing 1–100 of 483 holdings by value · page 1 of 5

Institutional Ownership Trend

8 quarters

Holder Concentration

Across 465 13F filers · Δ vs Mar 31, 2026
Top Holder
20.3%
Sep 2024 → Jun 2026 · range 14.0% – 25.6%
−1.4 pts
Top 5
49.3%
Sep 2024 → Jun 2026 · range 43.3% – 57.8%
−1.1 pts
Top 10
63.3%
Sep 2024 → Jun 2026 · range 57.7% – 70.1%
+0.4 pts
HHI
718
Sep 2024 → Jun 2026 · range 486 – 977
Broadly held−40

Quarterly Activity

vs Mar 31, 2026
New
59
Increased
144
Decreased
164
Sold Out
85
Unchanged
98
Holder count: -26
Institutional value: -15.2%
Shares held: +2.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 483
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 2011286 CUSIP 023939101 13F (30d) 222 filings 221 filers Visit website Investor relations