Research · Form 13F
JANA Partners Management, LP 13F holdings, Q2 2026
What JANA Partners Management, LP listed in its quarterly Form 13F-HR filing with the SEC: the US-listed securities it held at the end of the quarter, with values as reported in the filing. Managers file up to 45 days after the quarter ends.
- Quarter ended
- Positions
- 10
- Reported value
- $1.9B
- Option lines
- 0
- Loaded from SEC EDGAR
- SEC filing
- 0000902664-26-003486
- SEC CIK
- 0001998597
In its Form 13F-HR for the quarter ended 2026-06-30, JANA Partners Management, LP reported 10 positions with a reported value of $1.9 billion.
Kresmion reads each manager's Form 13F-HR information table from SEC EDGAR, keeps option lines (puts and calls) apart, sums the reported values of the other lines, computes each position's share of that sum, and compares share counts with the manager's previous filed quarter to label each position new, added, reduced or exited.
Largest positions, Q2 2026
All 10 positions, by reported value. Values as reported in the 13F filing for the quarter ended 2026-06-30, not current prices. The share of reported value is each position's value over the $1.9B sum of the positions; option lines are not in that sum.
| # | Security | Shares | Reported value | Share of reported value | Since Q1 2026 |
|---|---|---|---|---|---|
| 1 | Mercury Sys IncMRCY · CUSIP 589378108 | 3,958,849 | $484.3M | 25.46% | Reduced -3.6% |
| 2 | Cooper Cos IncCOO · CUSIP 216648501 | 3,582,480 | $256.9M | 13.50% | Added +0.5% |
| 3 | State STR SPDR S&P 500 ETF TSPY · CUSIP 78462F103 | 342,965 | $256.1M | 13.46% | Reduced -0.2% |
| 4 | Lamb Weston Hldgs IncLW · CUSIP 513272104 | 5,394,635 | $232.9M | 12.25% | Added +7.7% |
| 5 | Fiserv IncFISV · CUSIP 337738108 | 3,662,080 | $179.6M | 9.44% | Reduced -17.4% |
| 6 | Markel Group IncMKL · CUSIP 570535104 | 76,743 | $149.9M | 7.88% | Added +1.9% |
| 7 | Alkami Technology IncALKT · CUSIP 01644J108 | 6,747,707 | $122.3M | 6.43% | Added +24.2% |
| 8 | Six Flags Entertainment CorpFUN · CUSIP 83001C108 | 4,116,099 | $87.7M | 4.61% | Unchanged |
| 9 | Everpure IncP · CUSIP 74624M102 | 989,196 | $77.9M | 4.10% | Reduced -5.1% |
| 10 | RAPID7 IncRPD · CUSIP 753422104 | 6,749,936 | $54.7M | 2.87% | Added +0.1% |
Changes since Q1 2026
- New 0
- Added 5
- Reduced 4
- Exited 1
- Unchanged 1
New positions 0
No new position.
Added (more shares) 5
| Security | Shares Q1 2026 | Shares Q2 2026 | Change | Reported value Q2 2026 |
|---|---|---|---|---|
| Cooper Cos IncCOO · CUSIP 216648501 | 3,565,158 | 3,582,480 | +0.5% | $256.9M |
| Lamb Weston Hldgs IncLW · CUSIP 513272104 | 5,008,635 | 5,394,635 | +7.7% | $232.9M |
| Markel Group IncMKL · CUSIP 570535104 | 75,307 | 76,743 | +1.9% | $149.9M |
| Alkami Technology IncALKT · CUSIP 01644J108 | 5,431,388 | 6,747,707 | +24.2% | $122.3M |
| RAPID7 IncRPD · CUSIP 753422104 | 6,743,653 | 6,749,936 | +0.1% | $54.7M |
Reduced (fewer shares) 4
| Security | Shares Q1 2026 | Shares Q2 2026 | Change | Reported value Q2 2026 |
|---|---|---|---|---|
| Mercury Sys IncMRCY · CUSIP 589378108 | 4,107,424 | 3,958,849 | -3.6% | $484.3M |
| Fiserv IncFISV · CUSIP 337738108 | 4,435,605 | 3,662,080 | -17.4% | $179.6M |
| State STR SPDR S&P 500 ETF TSPY · CUSIP 78462F103 | 343,665 | 342,965 | -0.2% | $256.1M |
| Everpure IncP · CUSIP 74624M102 | 1,042,296 | 989,196 | -5.1% | $77.9M |
Exited 1
| Security | Shares Q1 2026 | Reported value Q1 2026 |
|---|---|---|
| Enhabit IncEHAB.D · CUSIP 29332G102 | 2,090,412 | $29.5M |
Counted by share count on each line, between the filings for Q1 2026 and Q2 2026. New and added lists are ordered by the Q2 2026 reported value, reduced and exited by the Q1 2026 value; each list shows at most 25. Option lines are counted separately below.
Option lines (puts and calls), Q2 2026
This filing lists no option lines.
Quarters on file
Every quarter of JANA Partners Management, LP's 13F filings Kresmion has stored, with the EDGAR accession of each document. The filing date is on each EDGAR filing page.
| Quarter | Quarter end | Positions | Reported value | Option lines | First stored by Kresmion | SEC filing |
|---|---|---|---|---|---|---|
| Q2 2026 | 10 | $1.9B | 0 | 0000902664-26-003486 | ||
| Q1 2026 | 11 | $1.7B | 0 | 0000902664-26-002515, 0000902664-26-002957 | ||
| Q4 2025 | 12 | $1.9B | 0 | 0000902664-26-001069 | ||
| Q3 2025 | 12 | $2.1B | 0 | 0000902664-25-005066 |
Method and limitations
- Source: the Form 13F-HR information table on SEC EDGAR. A 13F lists the securities on the SEC's 13(f) list (mainly stocks and other equity securities listed in the US, plus some options, warrants and convertible notes) held at quarter end; it does not show short positions, cash or holdings outside that list.
- Values are the values reported in the filing for the quarter end date. Kresmion reads no market price on this page.
- Option lines (puts and calls) are kept apart. Their reported value is the value of the underlying shares, so it is never added to the positions.
- Changes compare share counts on each line (same CUSIP) between the latest filing and the previous quarter filed. A new CUSIP for the same company (a merger or a change of share class) reads as one exit and one new position. A note reported by principal amount is listed but not compared.
- Stock splits: when a corroborated split of the security has an ex date between the two period ends, the previous share count is put on the new basis before the comparison (multiplied by 5 for a 5-for-1 split, divided by 10 for a 1-for-10 reverse split; the reported value stays as filed), and the line says so, for example "split-adjusted 5:1, ex 2026-05-08". Corroborated means Kresmion's split record holds it with a second witness agreeing on the ratio (a filed share count or the market value). If that record cannot be read, a line held on both filings is not compared.
- Tickers: a 13F lists CUSIPs, not tickers. A ticker is shown, linked and used for the split adjustment only on the CUSIP most managers we follow hold under it in the quarter; another share class, a tracking stock or a unit of the same issuer shows its issuer name and CUSIP only.
- When a manager files a later document for the same quarter (an amendment), Kresmion merges it into that quarter; the accessions are listed under Quarters on file.
- The 13F lists positions only; it does not say why a position changed, or what the manager holds today.
All the managers we follow · How to read a 13F filing · Company research
Cite this data
Kresmion reads each manager's Form 13F-HR information table from SEC EDGAR, keeps option lines (puts and calls) apart, sums the reported values of the other lines, computes each position's share of that sum, and compares share counts with the manager's previous filed quarter to label each position new, added, reduced or exited.
Upstream: SEC EDGAR filing 0000902664-26-003486, JANA Partners Management, LP 13F filings on SEC EDGAR
Kresmion, "JANA Partners Management, LP 13F holdings, Q2 2026", data as of 2026-08-16, https://kresmion.com/research/funds/jana-partners-management. Upstream data: SEC EDGAR filing 0000902664-26-003486; JANA Partners Management, LP 13F filings on SEC EDGAR.
Link to this data (HTML):
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