JANA Partners Management portfolio
Concentrated managerInvestment firmPortfolio as of Jun 30, 2026 (Q2 2026) · filed with the SEC on Aug 14, 2026 · data updated on Nov 5, 2026 · Q2 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
JANA Partners Management reported a $1.9 bn portfolio of 10 positions to the SEC as of the end of Q2 2026. Its largest positions are MRCY, COO, SPY.
Sections with a free account
What it reported after the quarter end (Q2 2026)
The 13F shows the portfolio as of Jun 30, 2026. Since then JANA Partners Management has filed these own trades with the SEC (Form 4, when it owns more than 10% of a company or holds a role in it) and stakes above 5% (13D and 13G). It is not everything it did: only what it must report before the next 13F.
Stake reported in the company · event of Oct 28, 2026 · filed Oct 30, 2026 · filing ↗
What changed this quarter
6 positions with a change (3 added to, 3 trimmed); also, 1 exited through an acquisition or merger. 4 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Fiserv−17%fewer sharesReduced14.8% → 9.4%
- Alkami Technology+24%more sharesIncreased5.1% → 6.4%
- Mercury Systems−3.6%fewer sharesReduced18.0% → 25.5%
- Lamb Weston Holdings+7.7%more sharesIncreased12.7% → 12.2%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- Mercury SystemsMRCY25.5%
- Cooper CompaniesCOO13.5%
- State Str Spdr S&P 500 ETF TSPY13.5%
- Lamb Weston HoldingsLW12.2%
- FiservFISV9.4%
- Markel GroupMKL7.9%
- Alkami TechnologyALKT6.4%
- Six Flags EntertainmentFUN4.6%
- EverpureP4.1%
- Rapid7RPD2.9%
“Since”: first quarter of the current run, unbroken until today. In the details, prices are the quarter-end prices of the quarters in which it added shares, per the 13F. The manager may have bought at any price within each quarter; the SEC only publishes the value at quarter end.
Portfolio by sector
- ● Industrials 25%
- ● Financials 17%
- ● Health Care 14%
- ● No sector 13%
- ● Information Technology 13%
- ● Consumer Staples 12%
- ● Consumer Discretionary 5%
How its portfolio changed (8 quarters)
Q2 2026: 10
Q2 2026: 100%
Q2 2026: 2.7%
Traded turnover: the weight it bought plus the weight it sold in the quarter, divided by two, excluding price moves. The plain “turnover” in the header does include that effect. With a free account: the full history and sectors over time.
13F filings with amendments or confidential positions
- 13F Q1 2026 ↗filed May 15, 2026Omitted positions (confidential)Amendment of Jun 30, 2026 (adds holdings) ↗1 position known later through an amendment, worth $61.5M: they could not be copied when the 13F was published.
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Investment firm, per its Form ADV of May 29, 2026 (high confidence).
The data, as reported: JANA PARTNERS MANAGEMENT, LP (CRD 292832): 7.B private funds: 6 hedge (gross assets $2.3 bn); 5.D assets by client type: pooled vehicles 100% (of $2.3 bn)
The type comes from a rule applied to that data. If it looks wrong, tell us.
Similar managers by type and size
Same type of filer and a 13F portfolio value between a third and three times this one. It is not a comparison of what they hold.
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