Jana Partners portfolio: Q2 2026 13F holdings
Barry Rosenstein. Barry Rosenstein's activist fund.
The Q3 2026 13F is due by 2026-11-16. This page switches to it as soon as it lands on SEC EDGAR (checked hourly).
Jana Partners reported 10 US stock positions worth $1.9B at the end of Q2 2026, against $1.6B in 10 positions at the end of Q1 2026. The ten largest are 100% of the portfolio, led by Mercury Sys Inc (25%), Cooper Companies and State Street. Over the quarter it opened 1 new position (Everpure), sold out of 1 (Enhabit Inc), added to 1 and trimmed 1.
Biggest buys in Q2 2026
Biggest sells in Q2 2026
Everything Jana Partners owns
| Company | % of portfolio | Value | Shares | vs Q1 2026 | Upside | The rule |
|---|---|---|---|---|---|---|
| Mercury Sys Inc | 25% | $484.3M | 3,958,849 | -4% | — | — |
| COOCooper Companies | 14% | $256.9M | 3,582,480 | same | -18% | Members only |
| STTState Street | 13% | $256.1M | 342,965 | same | -7% | Members only |
| Lamb Weston Hldgs Inc | 12% | $232.9M | 5,394,635 | +8% | — | — |
| FISVFiserv | 9.4% | $179.6M | 3,662,080 | -17% | +89% | Members only |
| Markel Group Inc | 7.9% | $149.9M | 76,743 | +2% | — | — |
| Alkami Technology Inc | 6.4% | $122.3M | 6,747,707 | +24% | — | — |
| Six Flags Entertainment Corp | 4.6% | $87.7M | 4,116,099 | same | — | — |
| PEverpure | 4.1% | $77.9M | 989,196 | NEW | -95% | Members only |
| RAPID7 Inc | 2.9% | $54.7M | 6,749,936 | same | — | — |
| Enhabit Inc | — | — | — | SOLD OUT | — | — |
Upside is to our model’s value from each company’s own SEC filings, for the S&P 500 companies we value (how). Positions sold out during the quarter are listed last.
Other 13F portfolios
- Berkshire HathawayWarren Buffett · Q2 2026
- Dodge & Cox220 positions · Q2 2026
- Harris Associates (Oakmark)Bill Nygren · Q2 2026
- First Eagle Investments422 positions · Q2 2026
- Coatue ManagementPhilippe Laffont · Q2 2026
- Viking GlobalAndreas Halvorsen · Q2 2026
- D1 Capital PartnersDan Sundheim · Q2 2026
- Tiger GlobalChase Coleman · Q2 2026
- Davis AdvisorsChris Davis · Q2 2026
- Pershing SquareBill Ackman · Q2 2026
- Lone Pine CapitalStephen Mandel · Q2 2026
- Elliott Investment ManagementPaul Singer · Q2 2026
What a 13F shows, and what it hides: 13F filings explained.
Generated automatically from Jana Partners’s Form 13F (CIK 1998597, accession 0000902664-26-003486) on SEC EDGAR, compared with its filing for Q1 2026. Long US stock positions only: 13Fs leave out shorts, cash, bonds, most non-US holdings and options (excluded here), and are up to 45 days old when filed. Research only, not investment advice. boring&rich is not affiliated with or endorsed by Jana Partners or Barry Rosenstein.