JANA Partners Management, LP
CIK 1998597 · View on SEC EDGAR ↗
- Portfolio value
- $1.9B
- Positions
- 10
- As of
- June 30, 2026
Portfolio value QoQ: +14.1% 13F does not disclose cash
- Top 10 holdings weight
- 100.00%
- Top 25 holdings weight
- 100.00%
- Positions above 1%
- 10
- Effective number of positions
- 7.1
Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)
Turnover Q2 2026: 2.5% Est. buys $44,616,756 · sells $90,276,974
Median holding: 4.0 quarters Tracked Q4 2024–Q2 2026 · 55.6% still held
- New positions
- 0
- Increased
- 5
- Decreased
- 4
- Closed
- 1
On this page
- Performance vs S&P How this manager's 13F portfolio performed against the S&P 500.
- Sector breakdown How the portfolio splits across market sectors.
- Portfolio Every stock this institution reports holding, from its latest 13F.
- High-conviction bets The holdings this manager is most concentrated in.
- Top moves The biggest position increases and decreases this quarter.
- Exited positions Positions the manager fully sold out of last quarter.
- Related The person behind this filer, where we can match one.
Performance vs S&P 500
Annualized: +5.6% · S&P 500: +18.0%
Approximates a buy-and-hold portfolio built from quarterly SEC 13F snapshots. Excludes cash, short positions, options/derivatives, and non-13(f) securities — reflects the disclosed long-equity book only, not total fund AUM. SEC filing lag is up to 45 days; this is not a real-time-copyable timing.
Priceable coverage: 93.1% · Options excluded: 1.0%
Sector breakdown
Full portfolio 10 positions
| Type | Streak | 8Q trend | |||||
|---|---|---|---|---|---|---|---|
| MRCY Mercury Systems Inc - Common Stock | $484,285,998 | 25.46% | 3,958,849 | $184,813,714 | Down ×5 | ||
| COO The Cooper Companies, Inc. - Common Stock | $256,899,641 | 13.50% | 3,582,480 | $1,990,844 | Up ×3 | ||
| SPY SPY | $256,115,973 | 13.46% | 342,965 | $32,616,877 | Down ×2 | ||
| LW Lamb Weston Holdings, Inc. Common Stock | $232,940,339 | 12.25% | 5,394,635 | $21,275,424 | Up ×1 | ||
| FISV Fiserv, Inc. - Common Stock | $179,625,024 | 9.44% | 3,662,080 | $-67,881,735 | Down ×1 | ||
| MKL Markel Group Inc. Common Stock | $149,879,846 | 7.88% | 76,743 | $5,736,977 | Up ×1 | ||
| ALKT Alkami Technology, Inc. - Common Stock | $122,268,451 | 6.43% | 6,747,707 | $37,158,601 | Up ×3 | ||
| FUN Six Flags Entertainment Corporation Common Stock New | $87,672,909 | 4.61% | 4,116,099 | $14,612,152 | |||
| PSTG Everpure, Inc. Class A common stock | $77,938,753 | 4.10% | 989,196 | $16,401,597 | Down ×1 | ||
| RPD Rapid7, Inc. - Common Stock | $54,674,482 | 2.87% | 6,749,936 | $17,516,954 | Up ×1 | ||
| No matches | |||||||
Conviction holdings
Positions increased for 3+ consecutive quarters.
Share counts are as reported in 13F filings (not split-adjusted)
Top movers (QoQ)
| Security | Action | Shares Δ | Value Δ |
|---|---|---|---|
| MRCY | Trimmed | -149K | +$184.8M |
| FISV | Trimmed | -774K | -$67.9M |
| ALKT | Bought more | +1.3M | +$37.2M |
| SPY | Trimmed | -700 | +$32.6M |
| LW | Bought more | +386K | +$21.3M |
| RPD | Bought more | +6K | +$17.5M |
| PSTG | Trimmed | -53K | +$16.4M |
| FUN | Price move only | +0 | +$14.6M |
| MKL | Bought more | +1K | +$5.7M |
| COO | Bought more | +17K | +$2.0M |
Exited positions
Includes corporate events (mergers, delistings) — not all exits are sells
Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.
| Security | Quarter | Shares before | Value before | Price since exit |
|---|---|---|---|---|
| TRMB | Dec. 31, 2025 | 1,881,399 | $153,616,228 | -24.0% |
| THS | March 31, 2026 | 5,821,337 | $137,325,340 | No longer tracked |
| FIS | June 30, 2025 | 496,895 | $37,108,119 | -49.9% |
| FRPT | March 31, 2026 | 557,390 | $33,961,773 | 24.9% |
| WOLF | March 31, 2025 | 4,988,216 | $33,221,519 | |
| EHAB | June 30, 2026 | 2,090,412 | $29,453,905 | No longer tracked |
| WEX | Sept. 30, 2025 | 164,029 | $24,094,220 | 24.6% |