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Barry Rosenstein JANA Partners Management

AUM $1.9B
1-Year Est. Return 18.33%
 

Barry Rosenstein is the founder of JANA Partners, an activist and event-driven investment firm. JANA is known for campaigns seeking strategic change, improved capital returns, and better operational execution at public companies. Rosenstein’s efforts have spanned consumer, industrial, and technology-related businesses over many years.

This Fund
S&P 500
This Quarter Est. Return
+23.22%
1 Year Est. Return
+18.33%
3 Year Est. Return
+47.25%
5 Year Est. Return
–
10 Year Est. Return
–
AUM
$1.9B
AUM Growth
+$235M
Cap. Flow
-$49M
Cap. Flow %
-2.58%
Top 10 Hldgs %
100%
Holding
11
New
–
Increased
5
Reduced
4
Closed
1

Top Buys

Rank Stock Value
1
ALKT icon
Alkami Technology
ALKT
+$21.7M
2
LW icon
Lamb Weston
LW
+$16.6M
3
MKL icon
Markel Group
MKL
+$2.68M
4
COO icon
Cooper Companies
COO
+$1.13M
5
RPD icon
Rapid7
RPD
+$41.6K

Top Sells

Rank Stock Value
1
FISV
Fiserv Inc
FISV
+$43.2M
2
EHAB
Enhabit
EHAB
+$29.5M
3
MRCY icon
Mercury Systems
MRCY
+$14.2M
4
P
Everpure Inc
P
+$3.89M
5
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$508K

Sector Composition

Rank Sector Weight
1 Industrials 25.46%
2 Technology 22.84%
3 Healthcare 13.5%
4 Consumer Staples 12.25%
5 Financials 7.88%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MRCY icon
1
Mercury Systems
MRCY
$5.49B
$484M 25.46%
3,958,849
-148,575
-4% -$14.2M
COO icon
2
Cooper Companies
COO
$14.9B
$257M 13.5%
3,582,480
+17,322
+0.5% +$1.13M
SPY icon
3
State Street SPDR S&P 500 ETF Trust
SPY
$809B
$256M 13.46%
342,965
-700
-0.2% -$508K
LW icon
4
Lamb Weston
LW
$7.38B
$233M 12.25%
5,394,635
+386,000
+8% +$16.6M
FISV
5
Fiserv Inc
FISV
$28B
$180M 9.44%
3,662,080
-773,525
-17% -$43.2M
MKL icon
6
Markel Group
MKL
$22.2B
$150M 7.88%
76,743
+1,436
+2% +$2.68M
ALKT icon
7
Alkami Technology
ALKT
$2.18B
$122M 6.43%
6,747,707
+1,316,319
+24% +$21.7M
FUN icon
8
Cedar Fair
FUN
$1.71B
$87.7M 4.61%
4,116,099
– –
P
9
Everpure Inc
P
$36.1B
$77.9M 4.1%
989,196
-53,100
-5% -$3.89M
RPD icon
10
Rapid7
RPD
$799M
$54.7M 2.87%
6,749,936
+6,283
+0.1% +$41.6K
EHAB
11
DELISTED
Enhabit
EHAB
– –
-2,090,412
Closed -$29.5M

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Barry Rosenstein's Q2 2026 Portfolio in Review

As of Q2 2026, Barry Rosenstein held 11 positions worth $1.9B, up 14% from $1.67B the previous quarter. Its ten largest holdings account for 100% of the portfolio.

Barry Rosenstein's Q2 2026 filing shows 5 increased, 4 reduced and 1 closed positions. The largest sale was Fiserv Inc, an estimated $43.2M.

By sector, the portfolio is most concentrated in Industrials at 25% of assets, up from 18% a quarter earlier, followed by Technology and Healthcare.

  • Barry Rosenstein added most to Alkami Technology in Q2 2026, an estimated $21.7M increase.
  • Barry Rosenstein's biggest Q2 2026 reduction was Fiserv Inc, cutting an estimated $43.2M.
  • Barry Rosenstein fully exited Enhabit in Q2 2026, selling an estimated $29.5M.
  • Barry Rosenstein's ten largest holdings make up 100% of its $1.9B portfolio in Q2 2026.
  • Barry Rosenstein opened 0 new positions and closed 1 in Q2 2026.
  • Barry Rosenstein's portfolio value rose 14% quarter-over-quarter to $1.9B.

Based on JANA Partners Management's 13F filing for Q2 2026, filed 14 Aug 2026.