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Hedge fund

Jana Partners Management, LP

13F for the quarter to June 30, 2026, filed August 14, 2026 · SEC CIK 1998597

Reported value
$1.9bn
87% in companies we cover
Positions we cover
9
Largest MRCY 25.5%
Copy, a year
+33.4%
S&P 500 +20.6%
Copy Sharpe ratio
0.90
S&P 500 1.09

How copying its 13F would have done

$10.0k$20.0k 2023202420252026 $23.4k$17.4k
CopyS&P 500 $10,000 copying Jana Partners Management, LP's filed holdings in companies we cover from November 17, 2023, buying on the first trading day after each 13F was filed and holding until the next, against the S&P 500 (total return). Marked weekly, log scale. Before costs and taxes; misses trading within each quarter and anything 13F does not show (shorts, cash, bonds, non-US holdings).

Biggest drop −21.6% (S&P 500 −16.9%); beta 1.04; alpha +13.4% a year (t = 0.79); last 12 months +43.1% against +12.1%.

Reported value by quarter

Jana Partners Management, LP: 13F reported value Total value of all positions in each quarter's 13F, as filed (values before 2023 were filed in thousands of dollars and are converted).
$0 $1B $2B $3B Reported value, 2023-09-30: $1.4B Reported value, 2023-12-31: $1.5B Reported value, 2024-03-31: $1.8B Reported value, 2024-06-30: $1.7B Reported value, 2024-09-30: $1.8B Reported value, 2024-12-31: $1.9B Reported value, 2025-03-31: $1.9B Reported value, 2025-06-30: $2B Reported value, 2025-09-30: $2.1B Reported value, 2025-12-31: $1.9B Reported value, 2026-03-31: $61.5M Reported value, 2026-06-30: $1.9B 2023-09-30 2024-06-30 2025-03-31 2026-06-30 $1.9B
View chart data
Period Reported value
2023-09-30 $1.4B
2023-12-31 $1.5B
2024-03-31 $1.8B
2024-06-30 $1.7B
2024-09-30 $1.8B
2024-12-31 $1.9B
2025-03-31 $1.9B
2025-06-30 $2B
2025-09-30 $2.1B
2025-12-31 $1.9B
2026-03-31 $61.5M
2026-06-30 $1.9B

Holdings and moves

CompanyShare of portfolioValueSharesChange in shares
MRCYMercury Systems Inc25.46%$484.3m3.96MNew
COOThe Cooper Companies13.51%$256.9m3.58MNew
LWLamb Weston Holdings, Inc.12.24%$232.9m5.39MNew
FISVFiserv9.44%$179.6m3.66MNew
MKLMarkel Group Inc.7.88%$149.9m76.7KNew
ALKTAlkami Technology, Inc.6.43%$122.3m6.75MNew
FUNSix Flags Entertainment Corporation4.61%$87.7m4.12MNew
PEverpure4.10%$77.9m989.2K−5.1% Reduced
RPDRapid7, Inc.2.87%$54.7m6.75MNew
CompanyBought (value)Shares
MRCYMercury Systems Inc$484.3m3.96M
COOThe Cooper Companies$256.9m3.58M
LWLamb Weston Holdings, Inc.$232.9m5.39M
FISVFiserv$179.6m3.66M
MKLMarkel Group Inc.$149.9m76.7K
ALKTAlkami Technology, Inc.$122.3m6.75M
FUNSix Flags Entertainment Corporation$87.7m4.12M
RPDRapid7, Inc.$54.7m6.75M

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

CompanySold (value)Shares
PEverpure−$4.2m−53.1K

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

No positions in covered companies were sold out this quarter.

  • Technology44.9%
  • Financials20.0%
  • Health Care15.6%
  • Consumer Staples14.2%
  • Consumer Discretionary5.3%

Share of the value held in companies we cover, by sector.

PeriodCopy, a yearS&P 500SharpeS&P 500Biggest dropBeta
Whole backtestNovember 17, 2023 to November 2, 2026+33.4%+20.6%0.901.09−21.6%1.04
Last yearNovember 7, 2025 to November 2, 2026+46.3%+14.2%0.930.84−21.6%1.80

From SEC Form 13F data sets. A 13F lists long positions in US-listed shares at the quarter's end, filed up to 45 days later; it does not show shorts, cash, bonds, non-US holdings or trades within the quarter. Positions in companies outside our coverage are not listed here. Research, not investment advice.