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JANA Partners Management, LP

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13F filer, CIK 1998597, NEW YORK, NY

JANA Partners Management, LP reported $1,902,301,416 across 10 holdings for the quarter ended 2026-06-30, in a 13F-HR filed 2026-08-14.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000902664-26-003486

Period
2026-06-30
Reported value
$1.9B
Holdings
10
Top 10 weight
100%
New
0
Sold out
1

Largest buys vs the previous quarter

SecurityShares changeApprox. value
ALKTadded+1,316,319$23.9M
LWadded+386,000$16.7M
MKLadded+1,436$2.8M
COOadded+17,322$1.24M
RPDadded+6,283$50.9K

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
FISVreduced-773,525-$37.9M
EHABexited-2,090,412-$29.5M
MRCYreduced-148,575-$18.2M
Preduced-53,100-$4.18M
SPYreduced-700-$523K

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, Q2 2026

Share positions as resolved from 13F-HR 0000902664-26-003486, largest first. % of portfolio is the value over $1,902,301,416, 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; 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; 2026Q2: 3,958,849 shares 3,958,849$484M25.46%-148,575Timeline
COOCOOPER COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 3,582,480 shares 3,582,480$257M13.5%+17,322Timeline
SPYSTATE STR SPDR S&P 500 ETF TQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 342,965 shares 342,965$256M13.46%-700Timeline
LWLAMB WESTON HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 5,394,635 shares 5,394,635$233M12.25%+386,000Timeline
FISVFISERV INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 3,662,080 shares 3,662,080$180M9.44%-773,525Timeline
MKLMARKEL GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 76,743 shares 76,743$150M7.88%+1,436Timeline
ALKTALKAMI TECHNOLOGY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 6,747,707 shares 6,747,707$122M6.43%+1,316,319Timeline
FUNSIX FLAGS ENTERTAINMENT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 4,116,099 shares 4,116,099$87.7M4.61%0Timeline
PEVERPURE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 1,042,296 shares; 2026Q2: 989,196 shares 989,196$77.9M4.1%-53,100Timeline
RPDRAPID7 INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q2: 6,749,936 shares 6,749,936$54.7M2.87%+6,283Timeline

Sold out in Q2 2026

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

SecurityShares beforeValue beforeType
EHABENHABIT INC2,090,412$29.5Mshares

How Q2 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 0000902664-26-003486 base2026-08-14acceptance time not in the bulk data set

Filings

Every filing of this filer: 13F reports and notices, the 13D and 13G it filed or is a reporting person of, and Forms 3, 4 and 5 it reported as an owner.

FilingSubjectFiledAcceptedIngested
13F-HR 0000902664-26-003486 Quarter ended 2026-06-302026-08-14acceptance time not in the bulk data set
13F-HR/A 0000902664-26-002957 Quarter ended 2026-03-312026-06-30acceptance time not in the bulk data set
13F-HR 0000902664-26-002515 Quarter ended 2026-03-312026-05-15acceptance time not in the bulk data set
13F-HR 0000902664-26-001069 Quarter ended 2025-12-312026-02-17acceptance time not in the bulk data set
13F-HR 0000902664-25-005066 Quarter ended 2025-09-302025-11-14acceptance time not in the bulk data set
13F-HR 0000902664-25-003587 Quarter ended 2025-06-302025-08-14acceptance time not in the bulk data set
13F-HR 0000902664-25-002348 Quarter ended 2025-03-312025-05-15acceptance time not in the bulk data set
13F-HR 0000902664-25-001058 Quarter ended 2024-12-312025-02-14acceptance time not in the bulk data set
13F-HR 0000902664-24-006510 Quarter ended 2024-09-302024-11-14acceptance time not in the bulk data set
13F-HR 0000902664-24-005100 Quarter ended 2024-06-302024-08-14acceptance time not in the bulk data set
13F-HR 0000902664-24-003586 Quarter ended 2024-03-312024-05-15acceptance time not in the bulk data set
13F-HR 0000902664-24-001588 Quarter ended 2023-12-312024-02-14acceptance time not in the bulk data set
13F-HR/A 0000902664-23-005626 Quarter ended 2023-09-302023-11-16acceptance time not in the bulk data set
13F-HR 0000902664-23-005550 Quarter ended 2023-09-302023-11-14acceptance time not in the bulk data set