1 tracked superinvestor hold Amentum Holdings, Inc. (AMTM), worth $20M combined, led by Ruane, Cunniff. Smart money is trimming AMTM as of the latest 13F filings.
Current price
$21.30
Superinvestors holding
1
tracked 13F / N-PORT funds
Combined value
$20M
disclosed long exposure
Tier-1 conviction
0
concentrated holders
Net this quarter
-1
0 buying · 1 selling
Smart money is net reducing AMTM: 1 funds trimmed versus 0 adding.
Amentum Holdings, Inc. (AMTM) appears mainly in diversified and quant books here (1 funds, $20M combined) rather than in concentrated conviction portfolios — read the holders below with that in mind.
The largest position belongs to Ruane, Cunniff at 0.6% of their book — no single tracked manager treats it as an outsized, top-weighted bet.
No tracked fund opened a new position this quarter; 0 added and 1 trimmed, a net reduction.
| Investor | Move | % of their portfolio | Position value |
|---|---|---|---|
| Trimmed | 0.6% | $20M |
Tier badge = signal quality: 1 concentrated conviction · 2 quant/multi (context) · 3 retail & diversified. Only Tier 1 holdings feed the consensus signal.
Which superinvestors own AMTM?
1 tracked funds hold Amentum Holdings, Inc. (AMTM), the largest being Ruane, Cunniff (Sequoia Fund) at 0.6% of its 13F portfolio. 0 of them are concentrated Tier-1 conviction managers.
Is smart money buying or selling AMTM?
In the most recent 13F quarter, 0 tracked funds added or opened AMTM and 1 trimmed it.
How much AMTM do tracked funds hold?
Combined disclosed long exposure to AMTM across tracked superinvestors is $20M as of the Mar 2026 filings.
Holdings aggregated from the latest SEC 13F & N-PORT filings via FMP · Mar 2026 quarter. Long equity positions only, reported with up to a 45-day delay — for activity between filings see real-time moves. Not financial advice.