Jana Partners Management, LP: 13F holdings, Q2 2026
Hedge fund · SEC EDGAR filings (CIK 1998597) · Explore on the interactive board
Jana Partners Management, LP disclosed 10 US equity positions worth $1.9bn in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 14, 2026). Its largest position is MRCY at 25.5% of the reported book, followed by COO, SPY. The top ten holdings are 100.0% of the book, and the portfolio behaves like about 7 equal-weight positions. Versus the prior filing it opened 0 new positions, added to 3, reduced 3 and exited 1. Note: this manager's most recent filing is 3934 quarters behind the newest quarter on file, so these figures are history rather than current positioning.
What does Jana Partners Management, LP own? Top holdings as of June 30, 2026
Change is measured in shares against the previous filing (Q1 2026), so price moves do not read as decisions. This quarter: 0 new, 3 added, 3 reduced, 1 exited.
| # | Stock | Sector | Weight | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|---|
| 1 | MRCY MERCURY SYS INC | Industrials | 25.5% | $484.3m | 3,958,849 | -4% | reduced |
| 2 | COO COOPER COS INC | Healthcare | 13.5% | $256.9m | 3,582,480 | 0% | held |
| 3 | SPY STATE STR SPDR S&P 500 ETF T | 13.5% | $256.1m | 342,965 | -0% | held | |
| 4 | LW LAMB WESTON HLDGS INC | Consumer Defensive | 12.2% | $232.9m | 5,394,635 | 8% | added |
| 5 | FISV FISERV INC | 9.4% | $179.6m | 3,662,080 | -17% | reduced | |
| 6 | MKL MARKEL GROUP INC | Financial Services | 7.9% | $149.9m | 76,743 | 2% | added |
| 7 | ALKT ALKAMI TECHNOLOGY INC | Technology | 6.4% | $122.3m | 6,747,707 | 24% | added |
| 8 | FUN SIX FLAGS ENTERTAINMENT CORP | Consumer Cyclical | 4.6% | $87.7m | 4,116,099 | 0% | held |
| 9 | P EVERPURE INC | Technology | 4.1% | $77.9m | 989,196 | -5% | reduced |
| 10 | RPD RAPID7 INC | Technology | 2.9% | $54.7m | 6,749,936 | 0% | held |
What did Jana Partners Management, LP sell? Positions exited since the previous filing
| Stock | Prior weight | Prior value |
|---|---|---|
| ENHABIT INC | 100.0% | $29.5m |
Sector mix
| Sector | Weight |
|---|---|
| Industrials | 25.5% |
| Healthcare | 13.5% |
| Technology | 13.4% |
| Consumer Defensive | 12.2% |
| Financial Services | 7.9% |
| Consumer Cyclical | 4.6% |
Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.
Filing history
How concentrated is Jana Partners Management, LP's portfolio?
Across every quarter Jana Partners Management, LP has filed, its median largest position is 21.7% of the book and its median top-ten weight is 99.1%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 1.0 completed holding spells, the median lasted 1.0 quarters; 10.0 positions are still open and their final length is unknown.