2026 Q3 Portfolio Activity
In 2026 Q3, JANA Partners Management, LP maintained a portfolio of 12 distinct positions. The most significant new addition was CASELLA WASTE SYS INC, now representing 9.16% of the total fund value. They heavily accumulated shares in FISERV INC, increasing the position by 13.3%. Conversely, JANA Partners Management, LP completely exited their position in MARKEL GROUP INC.
Position History
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Total Positions
12
Quarter
2026 Q3
Top Holding
MRCY (20.2%)
Top 10 Concentration
100.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-12 of 12
JANA Partners Management, LP Full Holdings List — 2026 Q3
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
MRCY
MERCURY SYS INC
|
Industrials | 20.22% | 25.46% |
#1
Prev: #1
|
6.5 |
—
|
-87,720 | -2.2% |
P
S
|
3,871,129 | $321,303,707 | 2023 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
LW
LAMB WESTON HLD...
|
Consumer Defensive | 14.15% | 12.25% |
#2
2
Prev: #4
|
6.5 |
—
|
no change | no change |
P
S
|
5,394,635 | $224,902,333 | 2024 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
COO
COOPER COS INC
|
Healthcare | 13.65% | 13.50% |
#3
1
Prev: #2
|
7.0 |
—
|
255,940 | 7.1% |
P
S
|
3,838,420 | $216,985,883 | 2025 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
SPY
STATE STR SPDR ...
|
ETF | 13.47% | 13.46% |
#4
1
Prev: #3
|
5.0 |
—
|
-62,238 | -18.1% |
P
S
|
280,727 | $214,090,832 | 2023 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
FISV
FISERV INC
|
Unknown | 11.80% | 9.44% |
#5
Prev: #5
|
6.5 |
—
|
488,169 | 13.3% |
P
S
|
4,150,249 | $187,508,250 | 2025 Q4 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
CWST
CASELLA WASTE S...
|
Industrials | 9.16% | — |
#6
Prev: #—
|
7.2 |
—
|
1,812,493 | — |
NEW
|
1,812,493 | $145,633,813 | 2026 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
ALKT
ALKAMI TECHNOLO...
|
Technology | 5.81% | 6.43% |
#7
Prev: #7
|
3.3 |
—
|
no change | no change |
P
S
|
6,747,707 | $92,376,109 | 2025 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
RPD
RAPID7 INC
|
Technology | 5.19% | 2.87% |
#8
2
Prev: #10
|
3.1 |
—
|
no change | no change |
P
S
|
6,749,936 | $82,484,218 | 2024 Q2 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
MOD
MODINE MFG CO
|
Consumer Cyclical | 3.39% | — |
#9
Prev: #—
|
4.9 |
—
|
287,620 | — |
NEW
|
287,620 | $53,842,464 | 2026 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
FUN
SIX FLAGS ENTER...
|
Consumer Cyclical | 3.15% | 4.61% |
#10
2
Prev: #8
|
3.3 |
—
|
553,103 | 13.4% |
P
S
|
4,669,202 | $50,007,153 | 2025 Q3 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
PSTG
EVERPURE INC
|
Technology | 0.00% | 4.10% |
Sold All 😨
(Was: #9) |
0.0 |
—
|
-989,196 | -100.0% |
CLOSED
|
— | $— | 2026 Q2 | 13F Filing | 2026-09-30 | 2026-11-13 | |||
|
MKL
MARKEL GROUP IN...
|
Financial Services | 0.00% | 7.88% |
Sold All 😨
(Was: #6) |
0.0 |
—
|
-76,743 | -100.0% |
CLOSED
|
— | $— | 2024 Q4 | 13F Filing | 2026-09-30 | 2026-11-13 |
Showing 1-12 of 12 holdings