JANA Partners Management 13F, Q4 2025
JANA Partners · quarter ending 31 December 2025 · filed 17 February 2026 · SEC CIK 1998597
Common stock only: shares the fund reported owning at the quarter end, valued as filed.
Largest positions, Q4 2025
Weights are against the whole filed book. Changes are in shares held, against the Q3 2025 filing.
| Company | Ticker | Value | % of book | vs Q3 2025 |
|---|---|---|---|---|
| MERCURY SYS INC | MRCY | $362.09M | 18.8% | -17% shares |
| COOPER COS INC | COO | $288.47M | 15.0% | +45% shares |
| SPDR S&P 500 ETF TR | SPY | $266.86M | 13.9% | unchanged |
| LAMB WESTON HLDGS INC | LW | $209.81M | 10.9% | unchanged |
| MARKEL GROUP INC | MKL | $174.59M | 9.1% | -45% shares |
| FISERV INC | FISV | $150.83M | 7.8% | new |
| TREEHOUSE FOODS INC | THS | $137.33M | 7.2% | unchanged |
| ALKAMI TECHNOLOGY INC | ALKT | $112.92M | 5.9% | +159% shares |
| RAPID7 INC | RPD | $102.50M | 5.3% | +4% shares |
| SIX FLAGS ENTERTAINMENT CORP | FUN | $63.14M | 3.3% | unchanged |
| FRESHPET INC | FRPT | $33.96M | 1.8% | -47% shares |
| ENHABIT INC | EHABUSD | $19.27M | 1.0% | -2% shares |
What changed since Q3 2025
Against the Q3 2025 filing, JANA Partners Management opened 1 new position, added to 3, trimmed 4, left 4 unchanged and exited 1. Every position is compared, matched on its CUSIP; a change of 2% or less in shares counts as unchanged.
Other quarters
Source: SEC Form 13F-HR, accession 0000902664-26-001069, filed by JANA Partners Management, LP. Values are as filed and cover US-listed positions only; a 13F does not show short positions or holdings outside the US. A 13F may be filed up to 45 days after the quarter ends, so the fund may have traded since. Educational information, not financial advice.