Research report
JANA Partners Q1 2026 13F Holdings and Activity Report
Verified Q1 2026 13F holdings for JANA Partners, covering institutional activity, data dates, SEC sources, filing limits, and methods.
JANA Partners
Barry Rosenstein
Period
Q2 2026
Portfolio Date
Jun 30, 2026
Stocks Held
10
Market Value
$1.9B
Holdings Value Trend
Q3 2024
Q4 2024
Q1 2025
Q2 2025
Q3 2025
Q4 2025
Q1 2026
Q2 2026
Top 5 Holdings
1
M
$MRCY
Mercury Systems, Inc.
25.5%
% of Portfolio
Decreased 3.62%
2C
$COO
The Cooper Companies, Inc.
13.5%
% of Portfolio
Increased 0.49%
3E
$ETF-SPY
SPDR S&P 500 ETF Trust
13.5%
% of Portfolio
Decreased 0.20%
4L
$LW
Lamb Weston Holdings, Inc.
12.3%
% of Portfolio
Increased 7.71%
5F
$FI
Fiserv, Inc.
9.4%
% of Portfolio
Decreased 17.44%
Historical Positions
| Symbol | Q2 2026 | Q1 2026 | Q4 2025 | Q3 2025 |
|---|---|---|---|---|
| MRCY | 25.5% | 18.6% | 18.8% | 22.3% |
| COO | 13.5% | 15.9% | 15.0% | 8.1% |
| ETF-SPY | 13.5% | 13.9% | 13.9% | 12.5% |
| LW | 12.3% | 13.2% | 10.9% | 14.1% |
| FI | 9.4% | 15.4% | 7.8% | - |
| MKL | 7.9% | 9.0% | 9.1% | 13.6% |
| ALKT | 6.4% | 5.3% | 5.9% | - |
| FUN | 4.6% | 4.5% | 3.3% | 4.5% |
| PSTG | 4.1% | - | - | - |
| RPD | 2.9% | 2.3% | 5.3% | 5.9% |
Post-Filing Contributors
Price change since reported price, ranked by portfolio contribution
LW+23.83%
FI+14.31%
COO+6.21%
ALKT+9.88%
ETF-SPY+2.12%
Post-Filing Detractors
Price change since reported price, ranked by portfolio contribution
MRCY-22.97%
MKL-8.43%
Sector Analysis
Financials9.1%
Healthcare15.6%
Technology26.4%
Industrials29.4%
Consumer Staples14.2%
Consumer Discretionary5.3%