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JANA Partners Management, LP

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13F filer, CIK 1998597, NEW YORK, NY

JANA Partners Management, LP reported $1,667,513,916 across 11 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-15. Its ten largest share positions make up 98.23% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000902664-26-002515

Period
2026-03-31
Reported value
$1.67B
Holdings
11
Top 10 weight
98.23%
New
1
Sold out
2

Largest buys vs the previous quarter

SecurityShares changeApprox. value
FISVadded+2,190,085$122M
Pnew+1,042,296$61.5M
ALKTadded+536,723$8.41M
COOadded+45,538$3.26M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
THSexited-5,821,337-$137M
MRCYreduced-852,057-$62.1M
FRPTexited-557,390-$34M
SPYreduced-47,672-$31M
MKLreduced-5,912-$11.3M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2026

Share positions as resolved from 13F-HR 0000902664-26-002515, largest first. % of portfolio is the value over $1,667,513,916, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
MRCYMERCURY SYS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 6,941,565 shares; 2024Q4: 6,941,565 shares; 2025Q1: 6,941,565 shares; 2025Q2: 6,753,413 shares; 2025Q3: 5,959,481 shares; 2025Q4: 4,959,481 shares; 2026Q1: 4,107,424 shares 4,107,424$299M17.96%-852,057The filing omitted confidential holdings, a later amendment may add them.Timeline
COOCOOPER COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 2,434,607 shares; 2025Q4: 3,519,620 shares; 2026Q1: 3,565,158 shares 3,565,158$255M15.29%+45,538The filing omitted confidential holdings, a later amendment may add them.Timeline
FISVFISERV INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 2,245,520 shares; 2026Q1: 4,435,605 shares 4,435,605$248M14.84%+2,190,085The filing omitted confidential holdings, a later amendment may add them.Timeline
SPYSTATE STR SPDR S&P 500 ETF TQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 478,963 shares; 2024Q4: 429,263 shares; 2025Q1: 540,353 shares; 2025Q2: 513,053 shares; 2025Q3: 386,637 shares; 2025Q4: 391,337 shares; 2026Q1: 343,665 shares 343,665$223M13.4%-47,672The filing omitted confidential holdings, a later amendment may add them.Timeline
LWLAMB WESTON HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 3,526,754 shares; 2024Q4: 7,131,339 shares; 2025Q1: 7,985,426 shares; 2025Q2: 7,232,219 shares; 2025Q3: 5,008,635 shares; 2025Q4: 5,008,635 shares; 2026Q1: 5,008,635 shares 5,008,635$212M12.69%0The filing omitted confidential holdings, a later amendment may add them.Timeline
MKLMARKEL GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 108,926 shares; 2025Q1: 156,022 shares; 2025Q2: 151,432 shares; 2025Q3: 147,411 shares; 2025Q4: 81,219 shares; 2026Q1: 75,307 shares 75,307$144M8.64%-5,912The filing omitted confidential holdings, a later amendment may add them.Timeline
ALKTALKAMI TECHNOLOGY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 1,892,413 shares; 2025Q4: 4,894,665 shares; 2026Q1: 5,431,388 shares 5,431,388$85.1M5.1%+536,723The filing omitted confidential holdings, a later amendment may add them.Timeline
FUNSIX FLAGS ENTERTAINMENT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 4,049,940 shares; 2025Q4: 4,116,099 shares; 2026Q1: 4,116,099 shares 4,116,099$73.1M4.38%0The filing omitted confidential holdings, a later amendment may add them.Timeline
PEVERPURE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 1,042,296 shares 1,042,296$61.5M3.69%newTimeline
RPDRAPID7 INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 3,655,540 shares; 2024Q4: 3,690,129 shares; 2025Q1: 4,106,056 shares; 2025Q2: 5,729,914 shares; 2025Q3: 6,502,108 shares; 2025Q4: 6,743,653 shares; 2026Q1: 6,743,653 shares 6,743,653$37.2M2.23%0The filing omitted confidential holdings, a later amendment may add them.Timeline
EHABENHABIT INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 2,137,145 shares; 2024Q4: 2,137,145 shares; 2025Q1: 2,137,145 shares; 2025Q2: 2,137,145 shares; 2025Q3: 2,137,145 shares; 2025Q4: 2,090,412 shares; 2026Q1: 2,090,412 shares 2,090,412$29.5M1.77%0The filing omitted confidential holdings, a later amendment may add them.Timeline

Sold out in Q1 2026

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
THSTREEHOUSE FOODS INC5,821,337$137Mshares
FRPTFRESHPET INC557,390$34Mshares

How Q1 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0000902664-26-002515 base2026-05-15acceptance time not in the bulk data set
13F-HR/A 0000902664-26-002957 addednew holdings2026-06-30acceptance time not in the bulk data set