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What Jana Partners changed, 2013 to 2026

53 quarterly 13F filings, from Q2 2013 to Q2 2026, each read from the filing itself. A quarter is compared only with the quarter before it, so a quarter with no filing is a gap in the record, not a sale.

Reported book

$1.9bn

$7.1bn at Q2 2013

Positions

10

43 at Q2 2013

Top ten weight

100%

70% at Q2 2013

Typical quarterly turnover

about 19%

Estimated from share changes

Reported book by quarter
$0$10bn$19bnQ2 2013: $7.1bnQ3 2013: $8.7bnQ4 2013: $7.9bnQ1 2014: $8.5bn14Q2 2014: $16.2bnQ3 2014: $19.3bnQ4 2014: $785mQ1 2015: $17.2bn15Q2 2015: $16.8bnQ3 2015: $8.9bnQ4 2015: $7.1bnQ1 2016: $5.3bn16Q2 2016: $5.9bnQ3 2016: $5.7bnQ4 2016: $5.7bnQ1 2017: $5.4bn17Q2 2017: $7.0bnQ3 2017: $4.9bnQ4 2017: $3.8bnQ1 2018: $3.4bn18Q2 2018: $3.8bnQ3 2018: $3.3bnQ4 2018: $2.2bnQ1 2019: $1.0bn19Q2 2019: $1.2bnQ3 2019: $1.2bnQ4 2019: $1.2bnQ1 2020: $862m20Q2 2020: $1.1bnQ3 2020: $1.1bnQ4 2020: $1.5bnQ1 2021: $1.5bn21Q2 2021: $1.2bnQ3 2021: $1.3bnQ4 2021: $1.5bnQ1 2022: $1.5bn22Q2 2022: $1.2bnQ3 2022: $1.2bnQ4 2022: $1.2bnQ1 2023: $1.3bn23Q2 2023: $1.3bnQ3 2023: $1.4bnQ4 2023: $1.5bnQ1 2024: $1.8bn24Q2 2024: $1.7bnQ3 2024: $1.9bnQ4 2024: $2.0bnQ1 2025: $1.9bn25Q2 2025: $2.0bnQ3 2025: $2.1bnQ4 2025: $1.9bnQ1 2026: $1.7bn26Q2 2026: $1.9bn
  • Q2 2013: $7.1bn
  • Q3 2013: $8.7bn
  • Q4 2013: $7.9bn
  • Q1 2014: $8.5bn
  • Q2 2014: $16.2bn
  • Q3 2014: $19.3bn
  • Q4 2014: $785m
  • Q1 2015: $17.2bn
  • Q2 2015: $16.8bn
  • Q3 2015: $8.9bn
  • Q4 2015: $7.1bn
  • Q1 2016: $5.3bn
  • Q2 2016: $5.9bn
  • Q3 2016: $5.7bn
  • Q4 2016: $5.7bn
  • Q1 2017: $5.4bn
  • Q2 2017: $7.0bn
  • Q3 2017: $4.9bn
  • Q4 2017: $3.8bn
  • Q1 2018: $3.4bn
  • Q2 2018: $3.8bn
  • Q3 2018: $3.3bn
  • Q4 2018: $2.2bn
  • Q1 2019: $1.0bn
  • Q2 2019: $1.2bn
  • Q3 2019: $1.2bn
  • Q4 2019: $1.2bn
  • Q1 2020: $862m
  • Q2 2020: $1.1bn
  • Q3 2020: $1.1bn
  • Q4 2020: $1.5bn
  • Q1 2021: $1.5bn
  • Q2 2021: $1.2bn
  • Q3 2021: $1.3bn
  • Q4 2021: $1.5bn
  • Q1 2022: $1.5bn
  • Q2 2022: $1.2bn
  • Q3 2022: $1.2bn
  • Q4 2022: $1.2bn
  • Q1 2023: $1.3bn
  • Q2 2023: $1.3bn
  • Q3 2023: $1.4bn
  • Q4 2023: $1.5bn
  • Q1 2024: $1.8bn
  • Q2 2024: $1.7bn
  • Q3 2024: $1.9bn
  • Q4 2024: $2.0bn
  • Q1 2025: $1.9bn
  • Q2 2025: $2.0bn
  • Q3 2025: $2.1bn
  • Q4 2025: $1.9bn
  • Q1 2026: $1.7bn
  • Q2 2026: $1.9bn
Share of the book in the ten largest positions
0%50%100%Q2 2013: 70%Q3 2013: 71%Q4 2013: 56%Q1 2014: 58%14Q2 2014: 57%Q3 2014: 61%Q4 2014: 100%Q1 2015: 64%15Q2 2015: 62%Q3 2015: 79%Q4 2015: 74%Q1 2016: 88%16Q2 2016: 64%Q3 2016: 65%Q4 2016: 65%Q1 2017: 60%17Q2 2017: 66%Q3 2017: 70%Q4 2017: 68%Q1 2018: 66%18Q2 2018: 65%Q3 2018: 63%Q4 2018: 65%Q1 2019: 100%19Q2 2019: 100%Q3 2019: 100%Q4 2019: 100%Q1 2020: 99%20Q2 2020: 100%Q3 2020: 100%Q4 2020: 100%Q1 2021: 100%21Q2 2021: 100%Q3 2021: 99%Q4 2021: 99%Q1 2022: 100%22Q2 2022: 100%Q3 2022: 100%Q4 2022: 100%Q1 2023: 100%23Q2 2023: 100%Q3 2023: 100%Q4 2023: 100%Q1 2024: 100%24Q2 2024: 98%Q3 2024: 98%Q4 2024: 99%Q1 2025: 100%25Q2 2025: 100%Q3 2025: 97%Q4 2025: 97%Q1 2026: 98%26Q2 2026: 100%
  • Q2 2013: 70%
  • Q3 2013: 71%
  • Q4 2013: 56%
  • Q1 2014: 58%
  • Q2 2014: 57%
  • Q3 2014: 61%
  • Q4 2014: 100%
  • Q1 2015: 64%
  • Q2 2015: 62%
  • Q3 2015: 79%
  • Q4 2015: 74%
  • Q1 2016: 88%
  • Q2 2016: 64%
  • Q3 2016: 65%
  • Q4 2016: 65%
  • Q1 2017: 60%
  • Q2 2017: 66%
  • Q3 2017: 70%
  • Q4 2017: 68%
  • Q1 2018: 66%
  • Q2 2018: 65%
  • Q3 2018: 63%
  • Q4 2018: 65%
  • Q1 2019: 100%
  • Q2 2019: 100%
  • Q3 2019: 100%
  • Q4 2019: 100%
  • Q1 2020: 99%
  • Q2 2020: 100%
  • Q3 2020: 100%
  • Q4 2020: 100%
  • Q1 2021: 100%
  • Q2 2021: 100%
  • Q3 2021: 99%
  • Q4 2021: 99%
  • Q1 2022: 100%
  • Q2 2022: 100%
  • Q3 2022: 100%
  • Q4 2022: 100%
  • Q1 2023: 100%
  • Q2 2023: 100%
  • Q3 2023: 100%
  • Q4 2023: 100%
  • Q1 2024: 100%
  • Q2 2024: 98%
  • Q3 2024: 98%
  • Q4 2024: 99%
  • Q1 2025: 100%
  • Q2 2025: 100%
  • Q3 2025: 97%
  • Q4 2025: 97%
  • Q1 2026: 98%
  • Q2 2026: 100%

The positions that defined it

Every position that was ever among the 25 largest: when it first appeared, when it was largest, and where it stands in Q2 2026. The line is its reported value each quarter.

PositionValue over timeFirst listedLargestQ2 2026
Mercury Sys Inc(MRCY)Q3 2021$484mQ2 2026$484m
Cooper Cos Inc(COO)Q3 2025$288mQ4 2025$257m
Spdr S&P 500 Etf Trust(SPY)Q2 2013$356mQ1 2024$256m
Lamb Weston HLDGS Inc(LW)Q4 2016$477mQ4 2024$233m
Fiserv Inc(FISV)Q4 2025$248mQ1 2026$180m
Markel Group Inc(MKL)Q4 2024$302mQ2 2025$150m
Alkami Technology Inc(ALKT)Q3 2025$122mQ2 2026$122m
Six Flags Entertainment Corp(FUN)Q3 2025$92mQ3 2025$88m
Everpure Inc(P)Class AQ1 2026$78mQ2 2026$78m
Rapid7 Inc(RPD)Q2 2024$148mQ4 2024$55m
Spdr S&P 500 Etf Trust(SPY)Q2 2013$5.9bnQ3 2014Soldlast listed Q2 2017
Qualcomm Inc(QCOM)Q4 2014$2.0bnQ1 2015Soldlast listed Q4 2015
Select Sector SPDR Shares Of Beneficial Interest Int-energy(XLE)Q2 2014$1.9bnQ2 2014Soldlast listed Q3 2014
Conagra Foods Inc(CAG)Q2 2015$1.2bnQ3 2015Soldlast listed Q2 2022
Walgreens Boots Alliance IncQ1 2015$1.2bnQ1 2015Soldlast listed Q2 2016
eBay Inc(EBAY)Q1 2014$1.2bnQ1 2015Soldlast listed Q2 2015
Select Sector SPDR Shares Of Beneficial Interest Cons Discretionary(XLY)Q1 2015$1.1bnQ1 2015Soldlast listed Q2 2015
Agrium IncQ2 2013$985mQ2 2013Soldlast listed Q3 2013

Quarter by quarter

2026Q1Q2
2025Q1Q2Q3Q4
2024Q1Q2Q3Q4
2023Q1Q2Q3Q4
2022Q1Q2Q3Q4
2021Q1Q2Q3Q4
2020Q1Q2Q3Q4
2019Q1Q2Q3Q4
2018Q1Q2Q3Q4
2017Q1Q2Q3Q4
2016Q1Q2Q3Q4
2015Q1Q2Q3Q4
2014Q1Q2Q3Q4
2013Q2Q3Q4

Q2 2023: $1.3bn across 9 positions

Against Q1 2023: 1 new, 5 added to, 2 trimmed, 1 sold out, across all 9 positions.

Turnover about 5% of the book, estimated from share changes at quarter-end prices.

Largest additions

  • Mercury Sys Inc (MRCY)+$50m
  • Freshpet Inc (FRPT)+$17m
  • Fidelity Natl Information SV (FIS)+$13m
  • Treehouse Foods Inc+$63k
  • Enhabit Inc (EHAB)+-$5.4m

Largest reductions

  • Laboratory Corp Amer HLDGS-$55m
  • Spdr S&P 500 Etf Trust (SPY)$5.3m

Opened

  • Leidos Holdings Inc (LDOS)$29m

Sold out

  • Blacksky Technology Incwas $4.3m

Largest positions, Q2 2023

PositionValueWeightOn the quarter
Freshpet Inc (FRPT)$282m21.1%Added
Treehouse Foods Inc$240m17.9%Added
New Relic Inc$210m15.7%Held
Fidelity Natl Information SV (FIS)$202m15.1%Added
Mercury Sys Inc (MRCY)$152m11.4%Added
Spdr S&P 500 Etf Trust (SPY)$98m7.3%Trimmed
Laboratory Corp Amer HLDGS$97m7.2%Trimmed
Leidos Holdings Inc (LDOS)$29m2.1%New
Enhabit Inc (EHAB)$28m2.1%Added

The books most like this one

Among the managers whose filings are on file, at Q2 2026. Overlap is the share of the two books that is the same: for every stock both list, the smaller of its two weights, added up. Two books can overlap because both own the largest companies; it says nothing about whether the managers agree.

ManagerOverlapStocks in bothOverlap over time
Bridgewater Associates LPat least 13%1Compare
Starboard Value LP5.5%1Compare
D. E. Shaw & Co.at least 5.1%2Compare
Verition Fund Management LLCat least 3.5%1Compare
Jane Street Group LLCat least 2.7%1Compare
Sachem Head Capital Management LP2.2%1Compare
Harris Associates LP1.5%3Compare
Man Group PLCat least 1.4%2Compare

“At least” where either manager has more positions than are read each quarter: a stock both hold below that range is not counted.

The filings behind it

Every quarter above is one 13F holdings report, with any amendment the filer made to it applied in the order it was filed. Where the reporting entity changed, each quarter keeps the filer that actually reported it.

QuarterFilerBookAmendedFiling
Q2 2026JANA Partners Management, LP$1.9bn13F-HR
Q1 2026JANA Partners Management, LP$1.7bn113F-HR
Q4 2025JANA Partners Management, LP$1.9bn13F-HR
Q3 2025JANA Partners Management, LP$2.1bn13F-HR
Q2 2025JANA Partners Management, LP$2.0bn13F-HR
Q1 2025JANA Partners Management, LP$1.9bn13F-HR
Q4 2024JANA Partners Management, LP$2.0bn13F-HR
Q3 2024JANA Partners Management, LP$1.9bn13F-HR
Q2 2024JANA Partners Management, LP$1.7bn13F-HR
Q1 2024JANA Partners Management, LP$1.8bn13F-HR
Q4 2023JANA Partners Management, LP$1.5bn13F-HR
Q3 2023JANA Partners Management, LP$1.4bn113F-HR
Q2 2023Jana Partners LLC$1.3bn13F-HR
Q1 2023Jana Partners LLC$1.3bn13F-HR
Q4 2022Jana Partners LLC$1.2bn13F-HR
Q3 2022Jana Partners LLC$1.2bn13F-HR
Q2 2022Jana Partners LLC$1.2bn13F-HR
Q1 2022Jana Partners LLC$1.5bn113F-HR
Q4 2021Jana Partners LLC$1.5bn13F-HR
Q3 2021Jana Partners LLC$1.3bn113F-HR
Q2 2021Jana Partners LLC$1.2bn13F-HR
Q1 2021Jana Partners LLC$1.5bn13F-HR
Q4 2020Jana Partners LLC$1.5bn13F-HR
Q3 2020Jana Partners LLC$1.1bn13F-HR
Q2 2020Jana Partners LLC$1.1bn13F-HR
Q1 2020Jana Partners LLC$862m113F-HR
Q4 2019Jana Partners LLC$1.2bn13F-HR
Q3 2019Jana Partners LLC$1.2bn13F-HR
Q2 2019Jana Partners LLC$1.2bn13F-HR
Q1 2019Jana Partners LLC$1.0bn13F-HR
Q4 2018Jana Partners LLC$2.2bn13F-HR
Q3 2018Jana Partners LLC$3.3bn13F-HR
Q2 2018Jana Partners LLC$3.8bn13F-HR
Q1 2018Jana Partners LLC$3.4bn13F-HR
Q4 2017Jana Partners LLC$3.8bn13F-HR
Q3 2017Jana Partners LLC$4.9bn113F-HR
Q2 2017Jana Partners LLC$7.0bn13F-HR
Q1 2017Jana Partners LLC$5.4bn13F-HR
Q4 2016Jana Partners LLC$5.7bn13F-HR
Q3 2016Jana Partners LLC$5.7bn13F-HR
Q2 2016Jana Partners LLC$5.9bn13F-HR
Q1 2016Jana Partners LLC$5.3bn13F-HR
Q4 2015Jana Partners LLC$7.1bn13F-HR
Q3 2015Jana Partners LLC$8.9bn13F-HR
Q2 2015Jana Partners LLC$16.8bn13F-HR
Q1 2015Jana Partners LLC$17.2bn13F-HR
Q4 2014Jana Partners LLC$785m13F-HR
Q3 2014Jana Partners LLC$19.3bn13F-HR
Q2 2014Jana Partners LLC$16.2bn13F-HR
Q1 2014Jana Partners LLC$8.5bn13F-HR
Q4 2013Jana Partners LLC$7.9bn13F-HR
Q3 2013Jana Partners LLC$8.7bn13F-HR
Q2 2013Jana Partners LLC$7.1bn13F-HR

Reading this record

A 13F lists US-listed long equity and options at the quarter end, filed up to 45 days later. It shows what was held, not when it was bought or at what price, and nothing short. Where a quarter lists only the largest positions, a name missing from it may still be held below that range; the counts of what was opened and sold always cover the whole filing.

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