JANA Partners Management, LP 13F: Quarter-over-Quarter Portfolio Changes
JANA Partners Management, LP reported a disclosed portfolio value of approximately $1.6 billion in its latest SEC Form 13F-HR filing for Q1 2026, down 16.4% quarter on quarter. Over the quarter, the fund bought more shares in 3 holdings, trimmed 3 holdings, and exited 2 positions.
JANA Partners Management, LP's top buy was Fiserv, INC. (FISV) . The fund bought 97.5% more shares, lifting the position's portfolio weight by 7.6 percentage points. Its top sell was Treehouse Foods INC (THS) . The fund exited the position completely after it had accounted for 7.1% of the previous portfolio.
Top BuysQ1 2026
The fund's top buys among existing positions in Q1 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| FISERV, INC. | FISV | +7.6% | +97.5% | History → |
| ALKAMI TECHNOLOGY INC | ALKT | +-0.6% | +11.0% | History → |
| COOPER COMPANIES | COO | +0.9% | +1.3% | History → |
Top SellsQ1 2026
The fund's top sells among positions it retained in Q1 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| MERCURY SYS INC | MRCY | -0.2% | 17.2% | History → |
| STATE STR SPDR S&P 500 ETF T | SPY | 0.0% | 12.2% | History → |
| MARKEL GROUP INC | MKL | -0.1% | 7.3% | History → |
Full ExitsQ1 2026
Positions present in the prior 13F-HR filing that no longer appear in Q1 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| TREEHOUSE FOODS INC | THS | 7.1% |
| FRESHPET INC | FRPT | 1.8% |
Net Portfolio Value ChangeQ1 2026
- $1.9BPrior quarter
- $1.6BCurrent quarter
- $-0.3BNet delta
- -16.4%% change
Methodology & FAQ
How JANA Partners Management, LP Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for JANA Partners Management, LP: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description — including how confidential treatment filings are handled — is documented in the Methodology.
What stocks did JANA Partners Management, LP buy in Q1 2026?
In Q1 2026, JANA Partners Management, LP bought more shares of FISERV, INC. (FISV), ALKAMI TECHNOLOGY INC (ALKT), COOPER COMPANIES (COO).
What stocks did JANA Partners Management, LP sell in Q1 2026?
In Q1 2026, JANA Partners Management, LP fully sold 2 positions (TREEHOUSE FOODS INC (THS), FRESHPET INC (FRPT)); reduced holdings in MERCURY SYS INC (MRCY), STATE STR SPDR S&P 500 ETF T (SPY), MARKEL GROUP INC (MKL).
Which positions did JANA Partners Management, LP initiate in Q1 2026?
JANA Partners Management, LP established no new positions in Q1 2026.
Which existing positions saw the largest allocation increases for JANA Partners Management, LP in Q1 2026?
Of 3 existing positions with share-count increases in Q1 2026, the largest were: FISERV, INC. (FISV, +7.6% weight, +97.5% shares), ALKAMI TECHNOLOGY INC (ALKT, +-0.6% weight, +11.0% shares), COOPER COMPANIES (COO, +0.9% weight, +1.3% shares).
Which positions did JANA Partners Management, LP fully exit in Q1 2026?
JANA Partners Management, LP fully exited 2 positions in Q1 2026: TREEHOUSE FOODS INC (THS, last-reported weight 7.1%), FRESHPET INC (FRPT, last-reported weight 1.8%).
Which existing positions saw the largest allocation reductions for JANA Partners Management, LP in Q1 2026?
Of 3 existing positions with share-count reductions in Q1 2026, the largest were: MERCURY SYS INC (MRCY, -0.2% weight, -17.2% shares), STATE STR SPDR S&P 500 ETF T (SPY, 0.0% weight, -12.2% shares), MARKEL GROUP INC (MKL, -0.1% weight, -7.3% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.