# JANA Partners Management, LP: Form 13F holdings

An institutional investment manager in NEW YORK, NY. SEC CIK 1998597.

- Quarter ended: 2026-06-30
- Filed: 2026-08-14
- Reported value: $1.90bn
- Positions: 10 (10 lines in the filing's table; lines for the same security and option type are added together here)
- Compared with: the 13F for the quarter ended 2026-03-31
- Filing: https://www.sec.gov/Archives/edgar/data/1998597/000090266426003486/

## Holdings

As filed, largest first. Reported value is what the manager stated at the quarter end (Jun 30, 2026), in US dollars; it is filing data, not a price. Weight is the share of the total reported value.

| Issuer | Class | Reported value | Weight | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | ---: | --- | --- |
| [MERCURY SYS INC (MRCY)](/companies/mrcy.md) | COM | $484.3m | 25.5% | 3,958,849 |  | Reduced −148,575 |
| [COOPER COS INC (COO)](/companies/coo.md) | COM | $256.9m | 13.5% | 3,582,480 |  | Added +17,322 |
| [STATE STR SPDR S&P 500 ETF T (SPY)](/companies/spy.md) | TR UNIT | $256.1m | 13.5% | 342,965 |  | Reduced −700 |
| [LAMB WESTON HLDGS INC (LW)](/companies/lw.md) | COM | $232.9m | 12.2% | 5,394,635 |  | Added +386,000 |
| [FISERV INC (FISV)](/companies/fisv.md) | COM | $179.6m | 9.4% | 3,662,080 |  | Reduced −773,525 |
| [MARKEL GROUP INC (MKL)](/companies/mkl.md) | COM | $149.9m | 7.9% | 76,743 |  | Added +1,436 |
| [ALKAMI TECHNOLOGY INC (ALKT)](/companies/alkt.md) | COM | $122.3m | 6.4% | 6,747,707 |  | Added +1,316,319 |
| [SIX FLAGS ENTERTAINMENT CORP (FUN)](/companies/fun.md) | COM | $87.7m | 4.6% | 4,116,099 |  | Unchanged |
| [EVERPURE INC (P)](/companies/p.md) | CL A | $77.9m | 4.1% | 989,196 |  | New +989,196 |
| [RAPID7 INC (RPD)](/companies/rpd.md) | COM | $54.7m | 2.9% | 6,749,936 |  | Added +6,283 |

## Sold out

Held at the end of the quarter before and not reported this quarter.

| Issuer | Class | Reported value | Weight | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | ---: | --- | --- |
| ENHABIT INC | COM | $0 | 0.0% | 0 |  | Sold out −2,090,412 |

Source: SEC EDGAR, Form 13F-HR, accession 0000902664-26-003486. Last ingested by Listed: Oct 22, 2026, 05:26 ET. No prices; not investment advice.