JANA Partners Management, LP

In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 14, 2026), JANA Partners Management, LP reported 10 stock positions worth $1.9 billion. Its top holding was Mercury Systems (MRCY) at 25.5% of the portfolio, followed by Cooper Cos (COO, 13.5%) and SS SPDR S&P 500 ETF Trust-US (SPY, 13.5%). Compared with Q1 2026, it sold out of 1, added to 5 and reduced 4. The biggest buy was Alkami Technology (ALKT, shares +24%) and the biggest sale Fiserv (FISV, shares −17%).

Most Recent 13F
Q2 2026
Location
NEW YORK, NY
CIK
0001998597
Portfolio Value
$1.9B (Q2 2026)
SEC Filing
0000902664-26-003486 ↗ filed Aug 14, 2026

Holdings Value

0$500.0M$1.0B$1.5B$2.0B$2.5B Q1 2024: $1.8B Q1 2024 Q2 2024: $1.7B Q2 2024 Q3 2024: $1.8B Q3 2024 Q4 2024: $1.9B Q4 2024 Q1 2025: $1.9B Q1 2025 Q2 2025: $2.0B Q2 2025 Q3 2025: $2.1B Q3 2025 Q4 2025: $1.9B Q4 2025 Q1 2026: $1.7B Q1 2026 Q2 2026: $1.9B $1.9B Q2 2026

Holdings 10 stocks · $1.9B
MRCY Mercury Systems Inc. 25.46% 3,958,849 $484.3M Reduce -3.6%
COO The Cooper Cos Inc. 13.50% 3,582,480 $256.9M Add +0.5%
SPY SS SPDR S&P 500 ETF Trust-US 13.46% 342,965 $256.1M Reduce -0.2%
LW Lamb Weston Holdings Inc. 12.25% 5,394,635 $232.9M Add +7.7%
FISV Fiserv Inc. 9.44% 3,662,080 $179.6M Reduce -17.4%
MKL Markel Group Inc. 7.88% 76,743 $149.9M Add +1.9%
ALKT Alkami Technology Inc. 6.43% 6,747,707 $122.3M Add +24.2%
FUN Six Flags Entertainment Corp. 4.61% 4,116,099 $87.7M No change
P Everpure Inc. Class A 4.10% 989,196 $77.9M Reduce -5.1%
RPD RAPID7 Inc. 2.87% 6,749,936 $54.7M Add +0.1%

Portfolio Sells Q1 2026 → Q2 2026
FISV Fiserv Inc. Reduce -17.4% 9.44% −5.40
EHAB Enhabit Inc. Sold out 0.00% −1.77
SPY SS SPDR S&P 500 ETF Trust-US Reduce -0.2% 13.46% +0.06
P Everpure Inc. Class A Reduce -5.1% 4.10% +0.41
MRCY Mercury Systems Inc. Reduce -3.6% 25.46% +7.50

Portfolio Buys Q1 2026 → Q2 2026
ALKT Alkami Technology Inc. Add +24.2% 6.43% +1.32
RPD RAPID7 Inc. Add +0.1% 2.87% +0.65
LW Lamb Weston Holdings Inc. Add +7.7% 12.25% −0.45
MKL Markel Group Inc. Add +1.9% 7.88% −0.77
COO The Cooper Cos Inc. Add +0.5% 13.50% −1.78

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 10$1.9BMRCY, COO, SPY, LW, FISV
Q1 2026Amended 11$1.7BMRCY, COO, FISV, SPY, LW
Q4 2025 12$1.9BMRCY, COO, SPY, LW, MKL
Q3 2025 12$2.1BMRCY, LW, MKL, SPY, COO
Q2 2025 10$2.0BLW, MRCY, SPY, MKL, TRMB
Q1 2025 10$1.9BLW, SPY, MRCY, MKL, TRMB
Q4 2024 10$1.9BLW, TRMB, MRCY, SPY, MKL
Q3 2024 11$1.8BTRMB, SPY, MRCY, LW, THS
Q2 2024 12$1.7BFYBR, SPY, FIS, TRMB, MRCY
Q1 2024 10$1.8BSPY, FIS, TRMB, FYBR, MRCY