JANA Partners Q4 2025 13F Holdings and Activity Report

I. Institutional Overview: The Psychological Portrait and Strategic Scale of Jana Partners

The scale of the institution, while not in the tens of billions like some of its peers, is strategically sized to allow for significant influence over mid-to-large cap targets without being so large that it loses the agility required for tactical entries and exits. A portfolio value of $1.92 billion spread across just 12 names means that the average position size is roughly $160 million, representing a substantial stake in many of the underlying companies. This concentration suggests a "quality over quantity" philosophy where every single ticker must earn its place through a rigorous assessment of potential corporate catalysts, valuation anomalies, or operational turnaround possibilities.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

II. Sector Allocation Analysis: Macro Signals and Track Selection

The top three sectors—Consumer Staples, Technology, and Industrials—collectively account for 67.04% of the portfolio. This is a highly focused layout. The near-equal weighting of these three sectors suggests a "tripod" strategy. Consumer Staples provides a defensive floor and a history of successful activist interventions (such as their past work with Whole Foods or Pinnacle Foods). Technology represents the growth engine, likely focused on software-as-a-service (SaaS) companies with "broken" valuations or sub-optimal margins. Industrials, dominated by their massive stake in Mercury Systems, represents a specialized bet on the defense and aerospace supply chain.

Looking deeper into the Technology and Industrial allocations, there is a clear preference for specialized mission-critical services . In Industrials, they aren't buying broad manufacturing; they are in Mercury Systems (MRCY), which focuses on high-end defense electronics. In Technology, they are in Rapid7 (RPD) and Alkami (ALKT)—cybersecurity and banking software. This tells us that Jana’s "track selection" is focused on companies that are deeply embedded in their customers' workflows, making them resilient but also making them attractive acquisition targets for larger players—a classic activist exit strategy.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

III. Top 10 Holdings Deep Dive: Portfolio Cornerstone and Core Logic

Mercury Systems remains Jana’s largest position at 18.84%, despite a 16.78% reduction in shares this quarter. This is a classic "Conviction Holding" that has likely moved into a "Tactical Management" phase. Jana has been involved with MRCY for over 4 years, pushing for operational improvements and a potential sale. The reduction this quarter, which saw the weight drop from 22.33% to 18.84%, likely represents a mix of profit-taking and risk management. Given that the stock has a PnL of +53.94% for Jana, they are harvesting gains while maintaining enough "skin in the game" to continue influencing the company’s trajectory. The logic here is simple: MRCY is a leader in defense electronics, a sector with high barriers to entry and strong secular tailwinds, but it has historically struggled with margins. Jana is staying until the "end game"—likely a strategic acquisition.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

IV. Major Buys/Additions: Offensive Direction and Capital Flow

The additions this quarter are heavily clustered in Fintech and Specialized SaaS . Between FI, ALKT, and the small add to RPD (Rapid7), Jana is clearly rotating toward "Software and Services." This reveals a macro-judgment: in an environment of fluctuating interest rates, companies with high recurring revenue and "mission-critical" software are the safest and most profitable places to deploy capital. They are moving away from "Hard Industrials" (like the exited Trimble) and toward "Digital Infrastructure."

This offensive move has significantly increased the Growth profile of the portfolio. By adding to ALKT and COO and entering FI, Jana has shifted the portfolio's center of gravity toward higher-multiple, higher-growth industries. While this increases potential returns, it also makes the portfolio more sensitive to interest rate volatility. However, the "moats" around these businesses (high switching costs in banking software and contact lenses) provide a margin of safety that aligns with Jana's risk-aware activist methodology.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

V. Major Sells and Exits: Risk Avoidance and Strategy Adjustment

The quality of these exits appears very high. Jana is not "panic selling" losers; they are systematically harvesting gains from winners (TRMB, MKL, MRCY). The only "pain point" in the reductions is Freshpet (FRPT) , where they cut the position by 46% amidst a -26.66% PnL. This qualifies as " Error Correction " or "Cutting Losses," as the activist thesis in Freshpet may have hit a wall or the valuation became unjustifiable given the operational headwinds.

The exit from Trimble (Industrial Tech) and the reduction in Markel (Traditional Financials) to fund Fiserv and Alkami (Digital Fintech) represents a clear Strategy Rotation . Jana is moving "up the stack" from hardware and traditional services to software-driven financial infrastructure. This suggests a belief that in the current market, "multiples" will be better supported in companies with high-margin software revenue than in those with heavy physical operations or macro-sensitive insurance books.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

VI. Investment Insights and Risk Warnings

Jana is executing a masterful "Precision Pivot." They are not simply "buying the market"; they are concentrating capital into three specific areas where they see structural advantages: 1. Fintech Consolidation : The entry into Fiserv and the massive add to Alkami show a bet on the "re-platforming" of the financial world. 2. Healthcare Resilience : The surge in Cooper Companies (COO) suggests a move toward high-margin, recurring-revenue healthcare assets that are ripe for activist-led operational improvements. 3. Strategic Exits : The exit from Trimble and the trim of Markel demonstrate the discipline to walk away from successful trades once the primary catalysts have been realized.

Reference Value for Investors : For retail investors, the "signal" here is the aggressive move into Alkami (ALKT) and Fiserv (FI) . When an activist fund like Jana makes these their top moves, it often precedes a period of intense corporate activity—either a push for higher buybacks, a spinoff of divisions, or an outright sale. However, investors should be wary of simply copying the Lamb Weston (LW) or TreeHouse Foods (THS) positions, as these are "long-slog" activist plays where Jana has been underwater for some time.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

Sources and limitations

This report uses public U.S. Securities and Exchange Commission Form 13F disclosures and structured data maintained by 13F Hub. A 13F filing is a quarter-end snapshot of reportable long positions, is normally published with a delay, and does not disclose every short position, cash balance, bond, derivative, or non-U.S. asset.

Narrative content is prepared from the same-period SEC disclosure and 13F Hub structured data, then checked before publication. This material is for research and education, not personalized investment advice.