2026 Q1 Portfolio Activity
In 2026 Q1, JANA Partners Management, LP maintained a portfolio of 12 distinct positions. They heavily accumulated shares in FISERV INC, increasing the position by 97.5%. Conversely, JANA Partners Management, LP completely exited their position in TREEHOUSE FOODS INC.
Position History
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Total Positions
12
Quarter
2026 Q1
Top Holding
MRCY (18.6%)
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 Q1
| 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 | 18.65% | 18.84% |
#1
Prev: #1
|
6.5 |
—
|
-852,057 | -17.2% |
P
S
|
4,107,424 | $299,472,284 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
COO
COOPER COS INC
|
Healthcare | 15.87% | 15.01% |
#2
Prev: #2
|
6.0 |
—
|
45,538 | 1.3% |
P
S
|
3,565,158 | $254,908,797 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
FISV
FISERV INC
|
Unknown | 15.41% | 7.85% |
#3
3
Prev: #6
|
8.0 |
—
|
2,190,085 | 97.5% |
P
S
|
4,435,605 | $247,506,759 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
SPY
STATE STR SPDR ...
|
ETF | 13.92% | 13.89% |
#4
1
Prev: #3
|
5.0 |
—
|
-47,672 | -12.2% |
P
S
|
343,665 | $223,499,096 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
LW
LAMB WESTON HLD...
|
Consumer Defensive | 13.18% | 10.92% |
#5
1
Prev: #4
|
5.5 |
—
|
no change | no change |
P
S
|
5,008,635 | $211,664,915 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MKL
MARKEL GROUP IN...
|
Financial Services | 8.98% | 9.08% |
#6
1
Prev: #5
|
4.1 |
—
|
-5,912 | -7.3% |
P
S
|
75,307 | $144,142,869 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ALKT
ALKAMI TECHNOLO...
|
Technology | 5.30% | 5.88% |
#7
1
Prev: #8
|
4.1 |
—
|
536,723 | 11.0% |
P
S
|
5,431,388 | $85,109,850 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
FUN
SIX FLAGS ENTER...
|
Consumer Cyclical | 4.55% | 3.29% |
#8
2
Prev: #10
|
2.8 |
—
|
no change | no change |
P
S
|
4,116,099 | $73,060,757 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
RPD
RAPID7 INC
|
Technology | 2.31% | 5.33% |
#9
Prev: #9
|
1.9 |
—
|
no change | no change |
P
S
|
6,743,653 | $37,157,528 | 2024 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
EHAB
ENHABIT INC
|
Healthcare | 1.83% | 1.00% |
#10
2
Prev: #12
|
1.7 |
—
|
no change | no change |
P
S
|
2,090,412 | $29,453,905 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
FRPT
FRESHPET INC
|
Consumer Defensive | 0.00% | 1.77% |
Sold All 😨
(Was: #11) |
0.0 |
—
|
-557,390 | -100.0% |
CLOSED
|
— | $— | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
THS
TREEHOUSE FOODS...
|
Unknown | 0.00% | 7.15% |
Sold All 😨
(Was: #7) |
0.0 |
—
|
-5,821,337 | -100.0% |
CLOSED
|
— | $— | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 |
Showing 1-12 of 12 holdings