JANA Partners Management, LP 13F holdings
JANA Partners Management, LP reported 10 positions with a total reported value of $1.9B as of 2026-06-30, in its 13F for Q2 2026, filed 2026-08-14. Top holdings by reported value: MRCY MERCURY SYS INC (25.5%), COOPER COS INC (13.5%), SPY STATE STR SPDR S&P 500 ETF T (13.5%), LW LAMB WESTON HLDGS INC (12.2%), FISV FISERV INC (9.4%). Against 2026-03-31 it opened 0 new positions and exited 1. Next 13F due by 2026-11-14, the legal deadline 45 days after the quarter ending 2026-09-30.
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Top holdings
10 largest of 10 positions · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| MRCY MERCURY SYS INC | 3,958,849 | $484.3M | 25.5% |
| COOPER COS INC | 3,582,480 | $256.9M | 13.5% |
| SPY STATE STR SPDR S&P 500 ETF T | 342,965 | $256.1M | 13.5% |
| LW LAMB WESTON HLDGS INC | 5,394,635 | $232.9M | 12.2% |
| FISV FISERV INC | 3,662,080 | $179.6M | 9.4% |
| MKL MARKEL GROUP INC | 76,743 | $149.9M | 7.9% |
| ALKT ALKAMI TECHNOLOGY INC | 6,747,707 | $122.3M | 6.4% |
| FUN SIX FLAGS ENTERTAINMENT CORP | 4,116,099 | $87.7M | 4.6% |
| P EVERPURE INC | 989,196 | $77.9M | 4.1% |
| RPD RAPID7 INC | 6,749,936 | $54.7M | 2.9% |
SEC FORM 13F · Q2 2026 · VALUES AS REPORTED, NOT PRICES
New positions this quarter
Held at 2026-06-30, not at 2026-03-31 · 0 in all · reported value as of 2026-06-30
No new positions.
Sold out
Held at 2026-03-31, gone by 2026-06-30 · 1 in all · reported value as of 2026-03-31
| Holding | Shares 2026-03-31 | Reported value | % of portfolio then |
|---|---|---|---|
| ENHABIT INC | 2,090,412 | $29.5M | 1.8% |
Biggest increases and decreases
Positions held at both quarter ends, by change in shares · reported value as of 2026-06-30
Increases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| ALKT ALKAMI TECHNOLOGY INC | 5,431,388 | 6,747,707 | +24.2% | $122.3M |
| LW LAMB WESTON HLDGS INC | 5,008,635 | 5,394,635 | +7.7% | $232.9M |
| MKL MARKEL GROUP INC | 75,307 | 76,743 | +1.9% | $149.9M |
| COOPER COS INC | 3,565,158 | 3,582,480 | +0.5% | $256.9M |
| RPD RAPID7 INC | 6,743,653 | 6,749,936 | +0.1% | $54.7M |
Decreases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| FISV FISERV INC | 4,435,605 | 3,662,080 | -17.4% | $179.6M |
| MRCY MERCURY SYS INC | 4,107,424 | 3,958,849 | -3.6% | $484.3M |
| P EVERPURE INC | 1,042,296 | 989,196 | -5.1% | $77.9M |
| SPY STATE STR SPDR S&P 500 ETF T | 343,665 | 342,965 | -0.2% | $256.1M |
CIK 1998597 · 13F FILINGS ON EDGAR · INFORMATIONAL ONLY
