# JANA Partners Management, LP

> Institutional holdings reported to the SEC as of Q2 2026 on Form 13F. CIK 1998597. Source: https://holderbook.com/funds/1998597-jana-partners-management-lp/

- Reported value: $1.9B
- Positions: 10
- Weight of the ten largest: 100.0%
- Filed: 2026-08-14

A 13F reports long US equity positions only. Short positions, bonds, foreign listings, private holdings and cash are not visible, so this is not the manager's whole book.

## Holdings

| Security | Ticker | Value | Shares | Weight | Quarters held |
|---|---|---|---|---|---|
| MERCURY SYS INC | [MRCY](https://holderbook.com/stocks/MRCY/) | $484.3M | 3,958,849 | 25.5% | 12 |
| COOPER COS INC | [COO](https://holderbook.com/stocks/COO/) | $256.9M | 3,582,480 | 13.5% | 4 |
| STATE STR SPDR S&P 500 ETF T | [SPY](https://holderbook.com/stocks/SPY/) | $256.1M | 342,965 | 13.5% | 12 |
| LAMB WESTON HLDGS INC | [LW](https://holderbook.com/stocks/LW/) | $232.9M | 5,394,635 | 12.2% | 8 |
| FISERV INC | [FISV](https://holderbook.com/stocks/FISV/) | $179.6M | 3,662,080 | 9.4% | 3 |
| MARKEL GROUP INC | [MKL](https://holderbook.com/stocks/MKL/) | $149.9M | 76,743 | 7.9% | 7 |
| ALKAMI TECHNOLOGY INC | [ALKT](https://holderbook.com/stocks/ALKT/) | $122.3M | 6,747,707 | 6.4% | 4 |
| SIX FLAGS ENTERTAINMENT CORP | [FUN](https://holderbook.com/stocks/FUN/) | $87.7M | 4,116,099 | 4.6% | 4 |
| EVERPURE INC | [P](https://holderbook.com/stocks/P/) | $77.9M | 989,196 | 4.1% | 2 |
| RAPID7 INC | [RPD](https://holderbook.com/stocks/RPD/) | $54.7M | 6,749,936 | 2.9% | 9 |

## What the disclosed book did

Not the fund's return. This is the change in value of the positions disclosed on Form 13F, had they been left untouched, against SPY over the same quarter ends.

| Quarter | Book | Market | Difference | Priced |
|---|---|---|---|---|
| Q2 2026 | +17.1% | +14.8% | +2.3% | 98% |
| Q1 2026 | -9.8% | -4.6% | -5.2% | 93% |
| Q4 2025 | -3.3% | +2.4% | -5.6% | 100% |
| Q3 2025 | +10.1% | +7.8% | +2.3% | 100% |
| Q2 2025 | +5.1% | +10.5% | -5.4% | 100% |
| Q1 2025 | -11.2% | -4.6% | -6.7% | 94% |
| Q4 2024 | +1.7% | +2.1% | -0.5% | 92% |
| Q3 2024 | +10.3% | +5.4% | +4.9% | 100% |

## Quarter by quarter

| Quarter | Value | Positions |
|---|---|---|
| Q2 2026 | $1.9B | 10 |
| Q1 2026 | $1.7B | 11 |
| Q4 2025 | $1.9B | 12 |
| Q3 2025 | $2.1B | 12 |
| Q2 2025 | $2.0B | 10 |
| Q1 2025 | $1.9B | 10 |
| Q4 2024 | $2.0B | 10 |
| Q3 2024 | $1.9B | 11 |
| Q2 2024 | $1.7B | 12 |
| Q1 2024 | $1.8B | 10 |
| Q4 2023 | $1.5B | 8 |
| Q3 2023 | $1.4B | 9 |