JANA Partners Management, LP — 13F Holdings & Portfolio
CIK 1998597 · latest 13F-HR filed 2026-08-14
JANA Partners Management, LP manages $1.90B in 13F-reported U.S. long-equity assets across 10 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MRCY (25.46%), COO (13.50%), SPY (13.46%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 9 new positions, exited 0, added to 1, and trimmed 0.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
24TH FLOOR
NEW YORK, NY 10106
$1.90B
Long-equity book
10
Distinct positions
2026-06-30
Filed 2026-08-14
+9 / −0 / ↑1 / ↓0
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
New Positions
- MERCURY SYS INC$484.3M
- COOPER COS INC$256.9M
- STATE STR SPDR S&P 500 ETF T$256.1M
- LAMB WESTON HLDGS INC$232.9M
- FISERV INC$179.6M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | MERCURY SYS INC | MRCY | 589378108 | $484.3M | 25.46% | 3,958,849 | SH |
| 2 | COOPER COS INC | COO | 216648501 | $256.9M | 13.50% | 3,582,480 | SH |
| 3 | STATE STR SPDR S&P 500 ETF T | SPY | 78462F103 | $256.1M | 13.46% | 342,965 | SH |
| 4 | LAMB WESTON HLDGS INC | LW | 513272104 | $232.9M | 12.25% | 5,394,635 | SH |
| 5 | FISERV INC | FISV | 337738108 | $179.6M | 9.44% | 3,662,080 | SH |
| 6 | MARKEL GROUP INC | MKL | 570535104 | $149.9M | 7.88% | 76,743 | SH |
| 7 | ALKAMI TECHNOLOGY INC | ALKT | 01644J108 | $122.3M | 6.43% | 6,747,707 | SH |
| 8 | SIX FLAGS ENTERTAINMENT CORP | FUN | 83001C108 | $87.7M | 4.61% | 4,116,099 | SH |
| 9 | EVERPURE INC | P | 74624M102 | $77.9M | 4.10% | 989,196 | SH |
| 10 | RAPID7 INC | RPD | 753422104 | $54.7M | 2.87% | 6,749,936 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $1.90B | 10 | 0000902664-26-003486 |
| 2026-03-31 | 2026-05-15 | $1.61B | 10 | 0000902664-26-002515 |
| 2026-03-31 | 2026-06-30 | $61.5M | 1 | 0000902664-26-002957 |
| 2025-12-31 | 2026-02-17 | $1.92B | 12 | 0000902664-26-001069 |
| 2025-09-30 | 2025-11-14 | $2.07B | 12 | 0000902664-25-005066 |