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Filers›Asset Manager›JANA Partners Management, LP
DOSSIER · 13F-HR · Q1 2026

JANA Partners Management, LP

JANA's asset manager based in Stamford, CT — $1.9B in tracked AUM across 12 positions as of Q1 2026.

J
JANA·Stamford, CT·Asset Manager
CIK 0001998597 · last filed Mar 31, 2026
Total AUM
$1.9B
▼ 13.7%
vs prior
Holdings
12
—
positions
Whale Score
79
79
strong
Activity
—
no data
changes this Q
Top sector
Tech
40% weight
concentration
AI Analysis · Q1 2026 · Q1 2026
Comprehensive Analysis of JANA Partners Management, LP 13F Filing (Q3 2025)
Portfolio Overview

As of the report date September 30, 2025, JANA Partners Management, LP manages a portfolio valued at approximately $531.36 million, spread across just five holdings. This represents a dramatic contraction in assets under management (AUM) of 73.3% compared to the previous quarter's value of $1.99 billion. The reduction in AUM is accompanied by a significant decrease in the number of positions, dow...

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
MRCY
MERCURY SYS INC
$299M4.1M18.6%
02
COO
COOPER COS INC
$255M3.6M15.9%
03
FISV
FISERV INC
$248M4.4M15.4%
04
SPY
STATE STR SPDR S&P 500 ETF T
$223M344K13.9%
05
LW
LAMB WESTON HLDGS INC
$212M5.0M13.2%
06
MKL
MARKEL GROUP INC
$144M75K9.0%
07
ALKT
ALKAMI TECHNOLOGY INC
$85M5.4M5.3%
08
FUN
SIX FLAGS ENTERTAINMENT CORP
$73M4.1M4.5%
09
RPD
RAPID7 INC
$37M6.7M2.3%
10
EHAB
ENHABIT INC
$29M2.1M1.8%

Filing history

Filing history loading…
AI Agent · grounded in JANA
haiku-4-5 · 12 positions indexed
Sector mix
  • Tech40%
  • Financials19%
  • Cons. Disc.5%
  • Communications8%
  • Energy23%
  • Other5%
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