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Livermore
Livermore
ZHEN

JANA Partners Management, LP

SEC CIK
0001998597
Latest filing
Aug 14, 2026

The latest 13F from JANA Partners Management, LP covers Q2 2026 (filed Aug 14, 2026): 10 long positions worth $1.90B. The top 10 holdings make up 100.0% of the portfolio, and the largest is Mercury Systems Inc (MRCY) at 25.5%. Livermore has 14 filings on Form 13F from this institution, going back to Q3 2023.

What changed in Q2 2026

Share counts compared with Q1 2026: how many positions were new, added to, reduced or sold out, and the biggest buys and sells. Dollar amounts are estimated at the quarter-end prices implied by the filing.

Full comparison
New
0
Added
5
Est. +$44.6M
Reduced
4
Est. −$60.8M
Sold out
1
Est. −$29.5M

Top 5 holdings

Share of this quarter's portfolio value

  1. MRCYMercury Systems Inc
    25.5%$484.3MHistory
  2. COOCooper Companies, Inc.
    13.5%$256.9MHistory
  3. SPYSPDR S&P 500 ETF Trust
    13.5%$256.1MHistory
  4. LWLamb Weston Holdings, Inc.
    12.2%$232.9MHistory
  5. FISVFiserv Inc
    9.4%$179.6MHistory

Share of portfolio

Top 5 holdings and the other 5 positions, by share of portfolio value

  1. MRCY25.5%
  2. COO13.5%
  3. SPY13.5%
  4. LW12.2%
  5. FISV9.4%
  6. Other 5 positions25.9%

Biggest buys

New and added positions, by estimated amount bought

  1. ALKTAlkami Technology, Inc.
    +$23.9MAddedHistory
  2. LWLamb Weston Holdings, Inc.
    +$16.7MAddedHistory
  3. MKLMarkel Group Inc.
    +$2.80MAddedHistory
  4. COOCooper Companies, Inc.
    +$1.24MAddedHistory
  5. RPDRapid7, Inc.
    +$50.9KAddedHistory

Largest weight increases

New and added positions, by percentage points of the portfolio gained

  1. ALKTAlkami Technology, Inc.
    +1.32 pp5.1% → 6.4%History
  2. RPDRapid7, Inc.
    +0.65 pp2.2% → 2.9%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. FISVFiserv Inc
    −$37.9MReducedHistory
  2. EHABEnhabit, Inc.
    −$29.5MSold outHistory
  3. MRCYMercury Systems Inc
    −$18.2MReducedHistory
  4. PEverpure, Inc.
    −$4.18MReducedHistory
  5. SPYSPDR S&P 500 ETF Trust
    −$522.7KReducedHistory

Largest weight decreases

Reduced and sold-out positions, by percentage points of the portfolio lost

  1. FISVFiserv Inc
    −5.40 pp14.8% → 9.4%History
  2. EHABEnhabit, Inc.
    −1.77 pp1.8% → 0.0%History

Metrics

13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.

Portfolio value
$1.90B
+$234.8M (+14.1%) vs. prior quarter
Positions
10
−1 vs. prior quarter
Top 10 concentration
100.0%
Top 10 as share of value
Turnover
2.5%
Q2 2026, one quarter
Average holding period
7.8 quarters
Weighted by value

How these are calculated

  • Portfolio value: the market value of all long positions in the 13F, as reported at quarter end, excluding options.
  • Top 10 concentration: the combined value of the 10 largest positions as a share of portfolio value.
  • Turnover: the smaller of this quarter's estimated purchases and estimated sales, divided by the average of this and last quarter's portfolio value. Estimates multiply the change in shares by the quarter-end price implied by the filing (market value divided by shares); new positions use this quarter's value and sold-out positions last quarter's. Only positions reported in shares count, and it is not calculated when the previous quarter was not filed.
  • Average holding period: how many consecutive quarters each current position has been held (including this one; a quarter without the position or without a filing starts the count over), weighted by this quarter's value. Counting starts with the first 13F in Livermore (Q3 2023), so positions held before then are understated.

13F filings by quarter

12 quarters, going back to Q3 2023. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $2.07B (Q3 2025)

Q3 2023: $1.40BQ4 2023: $1.55BQ1 2024: $1.83BQ2 2024: $1.71BQ3 2024: $1.78BQ4 2024: $1.91BQ1 2025: $1.94BQ2 2025: $1.99BQ3 2025: $2.07BQ4 2025: $1.92BQ1 2026: $1.67BQ2 2026: $1.90B
Q3 2023Q2 2026
13F filings of JANA Partners Management, LP by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 14, 202610$1.90BMRCYCOOSPYvs. Q1 2026SEC
Q1 2026Jun 30, 2026Amended11$1.67BMRCYCOOFISVvs. Q4 2025SECSEC
Q4 2025Feb 17, 202612$1.92BMRCYCOOSPYvs. Q3 2025SEC
Q3 2025Nov 14, 202512$2.07BMRCYLWMKLvs. Q2 2025SEC
Q2 2025Aug 14, 202510$1.99BLWMRCYSPYvs. Q1 2025SEC
Q1 2025May 15, 202510$1.94BLWSPYMRCYvs. Q4 2024SEC
Q4 2024Feb 14, 202510$1.91BLWTRMBMRCYvs. Q3 2024SEC
Q3 2024Nov 14, 202411$1.78BTRMBSPYMRCYvs. Q2 2024SEC
Q2 2024Aug 14, 202412$1.71BFYBRSPYFISvs. Q1 2024SEC
Q1 2024May 15, 202410$1.83BSPYFISTRMBvs. Q4 2023SEC
Q4 2023Feb 14, 20248$1.55BSPYFRPTFYBRvs. Q3 2023SEC
Q3 2023Nov 16, 2023Amended9$1.40BNEWRFRPTTHS–SECSEC

13D and 13G filings

Companies where JANA Partners Management, LP reports owning 5% or more on Schedule 13D or 13G, and its latest filings.

Current stakes of 5% or more

3 companies, largest stake first.

Companies where JANA Partners Management, LP owns 5% or more
CompanyLatest formStakeChangeFirst filedLatest filingFiling
RPDRapid7, Inc.13D/A10.30%6.76M shares+0.20 ppfrom 10.10%Sep 27, 20248 filingsMar 30, 2026SEC
MRCYMercury Systems Inc13D/A6.90%4.11M shares−1.40 ppfrom 8.30%Feb 13, 20244 filingsMar 4, 2026SEC
ALKTAlkami Technology, Inc.13D6.30%6.75M shares+1.31 ppfrom 4.99%Apr 1, 20263 filingsJun 29, 2026SEC

Latest filings

29 filings on file made by JANA Partners Management, LP or listing it as a reporting person; the latest 20 are shown.

Schedule 13D and 13G filings by JANA Partners Management, LP
CompanyFiled (ET)FormStakeChangeEvent dateFiling
ALKTAlkami Technology, Inc.Jun 29, 20264:20 PM ET13D6.30%6.75M shares+1.31 ppfrom 4.99%Jun 22, 2026SEC
ALKTAlkami Technology, Inc.May 12, 20265:00 PM ET13D/A4.99%5.34M shares−0.11 ppfrom 5.10%Below 5%May 12, 2026SEC
ALKTAlkami Technology, Inc.Apr 1, 20265:13 PM ET13D5.10%5.43M sharesNewMar 25, 2026SEC
RPDRapid7, Inc.Mar 30, 20266:36 PM ET13D/A10.30%6.76M shares+0.20 ppfrom 10.10%Mar 26, 2026SEC
MRCYMercury Systems IncMar 4, 20269:46 PM ET13D/A6.90%4.11M shares−1.40 ppfrom 8.30%Mar 3, 2026SEC
THSTreeHouse Foods, Inc.Feb 11, 20265:00 PM ET13D/A0.00%0 shares−11.50 ppfrom 11.50%Below 5%Feb 11, 2026SEC
THSTreeHouse Foods, Inc.Nov 13, 20255:05 PM ET13D/A11.50%5.83M shares+0.60 ppfrom 10.90%Nov 10, 2025SEC
MRCYMercury Systems IncNov 10, 20256:30 PM ET13D/A8.30%4.97M shares−1.70 ppfrom 10.00%Nov 6, 2025SEC
MRCYMercury Systems IncAug 15, 20259:30 PM ET13D/A10.00%5.96M shares–Aug 13, 2025SEC
RPDRapid7, Inc.Aug 13, 20259:25 PM ET13D/A10.10%6.52M shares+2.10 ppfrom 8.00%Aug 11, 2025SEC
LWLamb Weston Holdings, Inc.Jul 1, 20259:30 PM ET13D/A4.90%6.96M shares−0.50 ppfrom 5.40%Below 5%Jun 30, 2025SEC
LWLamb Weston Holdings, Inc.Jun 10, 20254:30 PM ET13D/A5.40%7.56M shares0.00 ppfrom 5.40%Jun 8, 2025SEC
LWLamb Weston Holdings, Inc.Jun 5, 20254:30 PM ET13D/A5.40%7.56M shares−0.20 ppfrom 5.60%Jun 3, 2025SEC
THSTreeHouse Foods, Inc.May 12, 20255:56 PM ET13D/A10.90%5.49M shares–May 9, 2025SEC
RPDRapid7, Inc.Apr 21, 20258:31 AM ET13D/A8.00%5.12M shares+0.30 ppfrom 7.70%Apr 20, 2025SEC
RPDRapid7, Inc.Apr 10, 20256:03 PM ET13D/A7.70%4.94M shares+1.70 ppfrom 6.00%Apr 8, 2025SEC
LWLamb Weston Holdings, Inc.Apr 1, 20254:47 PM ET13D/A5.60%7.99M shares0.00 ppfrom 5.60%Mar 31, 2025SEC
RPDRapid7, Inc.Mar 24, 20257:42 PM ET13D/A6.00%3.87M shares+0.20 ppfrom 5.80%Mar 21, 2025SEC
RPDRapid7, Inc.Mar 13, 20259:50 PM ET13D/A5.80%3.69M shares0.00 ppfrom 5.80%Mar 11, 2025SEC
LWLamb Weston Holdings, Inc.Mar 7, 20254:12 PM ET13D/A5.60%7.99M shares+0.60 ppfrom 5.00%Mar 5, 2025SEC