JANA Partners portfolio — 13F holdings Q2 2026
JANA Partners (Barry Rosenstein) reported 10 long positions worth $1.9 billion as of 2026-06-30. Top holdings: MERCURY SYSTEMS INC, COOPER COMPANIES, INC., SPDR S&P 500 ETF TRUST, Lamb Weston Holdings, Inc., FISERV INC. Quarterly changes and source links to the original SEC 13F filings. Long options are listed separately in the interactive view.
Reported share positions (up to 20)
| Company | Report period | Value | Portfolio weight | Change | Source |
|---|---|---|---|---|---|
| MERCURY SYSTEMS INC | 2026-06-30 | 484285998.00 USD | 25.46% | reduce | Original filing |
| COOPER COMPANIES, INC. | 2026-06-30 | 256899641.00 USD | 13.50% | add | Original filing |
| SPDR S&P 500 ETF TRUST | 2026-06-30 | 256115973.00 USD | 13.46% | reduce | Original filing |
| Lamb Weston Holdings, Inc. | 2026-06-30 | 232940339.00 USD | 12.25% | add | Original filing |
| FISERV INC | 2026-06-30 | 179625024.00 USD | 9.44% | reduce | Original filing |
| MARKEL GROUP INC. | 2026-06-30 | 149879846.00 USD | 7.88% | add | Original filing |
| ALKAMI TECHNOLOGY, INC. | 2026-06-30 | 122268451.00 USD | 6.43% | add | Original filing |
| Six Flags Entertainment Corporation/NEW | 2026-06-30 | 87672909.00 USD | 4.61% | hold | Original filing |
| Everpure, Inc. | 2026-06-30 | 77938753.00 USD | 4.10% | reduce | Original filing |
| Rapid7, Inc. | 2026-06-30 | 54674482.00 USD | 2.87% | add | Original filing |
| Enhabit, Inc. | 2026-03-31 | — | — | exited | Original filing |
Recent source filings (up to 20)
| Report period | Filed | Form | Source |
|---|---|---|---|
| 2026-06-30 | 2026-08-14 00:00:00 | 13F-HR | Original filing |
| 2026-03-31 | 2026-05-15 00:00:00 | 13F-HR | Original filing |
| 2026-03-31 | 2026-06-30 00:00:00 | 13F-HR/A | Original filing |
| 2025-12-31 | 2026-02-17 00:00:00 | 13F-HR | Original filing |
| 2025-09-30 | 2025-11-14 00:00:00 | 13F-HR | Original filing |
| 2025-06-30 | 2025-08-14 00:00:00 | 13F-HR | Original filing |
| 2025-03-31 | 2025-05-15 00:00:00 | 13F-HR | Original filing |
| 2024-12-31 | 2025-02-14 00:00:00 | 13F-HR | Original filing |
| 2024-09-30 | 2024-11-14 00:00:00 | 13F-HR | Original filing |
| 2024-06-30 | 2024-08-14 00:00:00 | 13F-HR | Original filing |
| 2024-03-31 | 2024-05-15 00:00:00 | 13F-HR | Original filing |
| 2023-12-31 | 2024-02-14 00:00:00 | 13F-HR | Original filing |
| 2023-09-30 | 2023-11-14 00:00:00 | 13F-HR | Original filing |
| 2023-09-30 | 2023-11-16 00:00:00 | 13F-HR/A | Original filing |
Public disclosures can be delayed, incomplete, or amended. Report period describes a position date; transaction date describes a reported transaction; filed describes submission. A recent filing or page update does not establish a current holding. A dash means unavailable or not comparable, not zero.
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