Ruane Cunniff's AMTM Position Overview
Ruane Cunniff (via Ruane, Cunniff & Goldfarb L.P.) currently holds 1.62 M shares of Amentum Holdings, Inc. (AMTM) worth $42.33 M, representing 0.70% of the portfolio. First purchased in 2024-Q3, this short-term holding has been held for 7 quarters.
Based on 13F filings, Ruane Cunniff has maintained this position in AMTM for several quarters, showing initial confidence in the investment. Largest addition occurred in Q2 2025, adding 48,704 shares. Largest reduction occurred in Q1 2026, reducing 771,147 shares.
Analysis based on 13F filings available since 2013 Q2
Ruane Cunniff's Amentum Holdings (AMTM) Holding Value Over Time
Track share changes against reported price movement
Quarterly Amentum Holdings (AMTM) Trades by Ruane Cunniff
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | -771,147 | Reduce 32.21% | 1.62 M | $26.08 |
| Q4 2025 | -29,619 | Reduce 1.22% | 2.39 M | $29.00 |
| Q3 2025 | -17,995 | Reduce 0.74% | 2.42 M | $23.95 |
| Q2 2025 | +48,704 | Add 2.04% | 2.44 M | $23.61 |
| Q1 2025 | -43,255 | Reduce 1.78% | 2.39 M | $18.20 |
| Q4 2024 | -94,195 | Reduce 3.72% | 2.44 M | $21.03 |
| Q3 2024 | +2.53 M | New Buy | 2.53 M | $32.25 |
Ruane Cunniff's Amentum Holdings Investment FAQs
Ruane Cunniff first purchased Amentum Holdings, Inc. (AMTM) in Q3 2024, acquiring 2,530,489 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Ruane Cunniff has held Amentum Holdings, Inc. (AMTM) for 7 quarters since Q3 2024.
Ruane Cunniff's largest addition to Amentum Holdings, Inc. (AMTM) was in Q3 2024, adding 2,530,489 shares worth $81.61 M.
According to the latest 13F filing for Q1 2026, Ruane Cunniff's firm, Ruane, Cunniff & Goldfarb L.P., owns 1,622,982 shares of Amentum Holdings, Inc. (AMTM), valued at approximately $42.33 M.
As of the Q1 2026 filing, Amentum Holdings, Inc. (AMTM) represents approximately 0.70% of Ruane Cunniff's publicly disclosed stock portfolio, making it one of their key holdings.
Ruane Cunniff's peak holding in Amentum Holdings, Inc. (AMTM) was 2,530,489 shares, as reported at the end of Q3 2024.