13F Filing
JANA Partners Management, LP
Activist hedge fund founded by Barry Rosenstein in 2001. Combines value investing with operational activism. Past campaigns include Whole Foods, Apple, and Tiffany.
Filed2026.08.14
FilingCurrent Portfolio
$1.90B
Previous Portfolio
$1.61B
Change
+18.45%
Holdings
MRCYMERCURY SYS INCReduced$484.3M25.46%
COOCOOPER COS INCIncreased$256.9M13.50%
SPYSTATE STR SPDR S&P 500 ETF TReduced$256.1M13.46%
LWLAMB WESTON HLDGS INCIncreased$232.9M12.25%
FISVFISERV INCReduced$179.6M9.44%
MKLMARKEL GROUP INCIncreased$149.9M7.88%
ALKTALKAMI TECHNOLOGY INCIncreased$122.3M6.43%
FUNSIX FLAGS ENTERTAINMENT CORP$87.7M4.61%
PSTGEVERPURE INCNew$77.9M4.10%
RPDRAPID7 INCIncreased$54.7M2.87%
| # | Company | % of Portfolio | Activity | Market Value | Shares | Change | Sector |
|---|---|---|---|---|---|---|---|
| 1 |  MRCY MERCURY SYS INC | 25.46% | Reduced | $484.3M | 3,958,849 | −148,575 | Industrials |
| 2 |  COO COOPER COS INC | 13.50% | Increased | $256.9M | 3,582,480 | +17,322 | Health Care |
| 3 |  SPY STATE STR SPDR S&P 500 ETF T | 13.46% | Reduced | $256.1M | 342,965 | −700 | Equity ETF |
| 4 |  LW LAMB WESTON HLDGS INC | 12.25% | Increased | $232.9M | 5,394,635 | +386,000 | Consumer Staples |
| 5 |  FISV FISERV INC | 9.44% | Reduced | $179.6M | 3,662,080 | −773,525 | Industrials |
| 6 |  MKL MARKEL GROUP INC | 7.88% | Increased | $149.9M | 76,743 | +1,436 | Financials |
| 7 |  ALKT ALKAMI TECHNOLOGY INC | 6.43% | Increased | $122.3M | 6,747,707 | +1,316,319 | Information Technology |
| 8 |  FUN SIX FLAGS ENTERTAINMENT CORP | 4.61% | — | $87.7M | 4,116,099 | 0 | Consumer Discretionary |
| 9 |  PSTG EVERPURE INC | 4.10% | New | $77.9M | 989,196 | +989,196 | Information Technology |
| 10 |  RPD RAPID7 INC | 2.87% | Increased | $54.7M | 6,749,936 | +6,283 | Information Technology |
Portfolio Changes
Buy Positions
New Buy
Current 4.10%
+989,196Shares
Additional Buy
+0.49%
+17,322Shares
+7.71%
+386,000Shares
+1.91%
+1,436Shares
+24.24%
+1,316,319Shares
+0.09%
+6,283Shares
Sell Positions
Full Exit
Full Exit
0Shares
Partial Exit
−3.62%
−148,575Shares
−0.20%
−700Shares
−17.44%
−773,525Shares
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