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Jana Partners Management, LP
Barry Rosenstein · Hedge Fund · Activist
JANA Partners LLC (JANA) is a New York-based investment firm founded in 2001 by Barry Rosenstein. The firm specializes in event-driven investing with a primary focus on shareholder activism, identifying undervalued companies where it can serve as a catalyst for value creation. Since its inception, JANA has established a reputation for driving structural, operational, and strategic changes through constructive engagement with corporate management and boards. In 2019, the firm pivoted to focus exclusively on its activist-only strategy, JANA Strategic Investments (JSI), liquidating its non-activist hedge fund strategies. JANA is known for its high-conviction approach and has executed successful campaigns across various sectors, including notable engagements with companies like Whole Foods, Conagra Brands, and Freshpet. The firm prides itself on its 'V-cubed' philosophy, which emphasizes value, votes, and a variety of ways to win.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | -8.1% |
| YTD return | -6.1% |
| Sharpe ratio | -1.75 |
| Win rate | 38% |
| AUM | $1.6B |
| Inception | Oct 1, 2025 |
| Updated | Sep 18, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $1.6B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | https://janapartners.com |
Current Holdings
Updated on Sep 18, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| MRCY | Mercury Systems Inc | 21.6% | +3.5% |
| LW | Lamb Weston Holdings Inc | 18.3% | -15.2% |
| COO | The Cooper Companies, Inc | 15.7% | -24.8% |
| FISV | Fiserv, Inc. Common Stock | 12.1% | -20.3% |
| MKL | Markel Corporation | 8.6% | -6.2% |
| ALKT | Alkami Technology Inc | 8.5% | +4.6% |
| P | Everpure, Inc. | 5.7% | +43.2% |
| RPD | Rapid7 Inc | 5.5% | -18.8% |
| FUN | Six Flags Entertainment Corporation | 4.0% | -39.8% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Aug 31, 2026 | BUY | RPD | 3.5% → 5.5% |
| Aug 31, 2026 | BUY | LW | 14.0% → 18.3% |
| Aug 31, 2026 | SELL | FISV | 13.2% → 12.1% |
| Aug 31, 2026 | BUY | FUN | 4.9% → 4.0% |
| Aug 31, 2026 | BUY | MKL | 8.4% → 8.6% |
Investment Style Analysis
Jana Partners Management, LP is widely recognized for employing a Activist strategy. As of Sep 18, 2026, the firm oversees approximately $1.6B in assets under management (AUM). The portfolio demonstrates a clear preference for the Aerospace & Defense and Packaged Foods sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Aug 31, Jana Partners Management, LP made a significant move by increasing exposure to RPD. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
JANA employs a disciplined, 'V-cubed' investment philosophy focusing on Value, Votes, and a Variety of ways to win. The firm targets undervalued public companies where there is a clear opportunity for value-creating change. By conducting deep fundamental research and leveraging its extensive network of industry executives, JANA seeks to influence corporate strategy, governance, and capital allocation. The strategy prioritizes constructive shareholder engagement and seeks to build a mandate for change by aligning with other stakeholders to unlock significant alpha through material, value-accretive outcomes.
Disclaimer
The content provided on this page, including the simulated portfolio performance, holdings analysis, and AI-generated insights, is for informational and educational purposes only. It does not constitute financial advice, investment recommendations, or an offer to buy or sell any securities. All data is derived from historical SEC 13F filings and other public disclosures, which have a reporting lag. The "Simulated Performance" is a hypothetical reconstruction based on past disclosures and does not represent the actual returns of the institution. Past performance is not indicative of future results. Tritonix.ai is not affiliated with Jana Partners Management, LP.
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Frequently asked questions
How is the simulated portfolio for Jana Partners Management, LP constructed?
This simulation is powered by Tritonix AI using official SEC filings. We focus on the "Best Ideas" by filtering for only the Top 20 largest holdings and rebalancing them to 100%. The simulation tracks performance starting from Oct 1, 2025. Our AI monitors for updates every Monday to capture major shifts. This concentrated approach highlights the manager's true stock-picking skill and mirrors their actual investment returns.
What is Jana Partners Management, LP's largest holding?
As of the latest filing, Jana Partners Management, LP's top position is Mercury Systems Inc (MRCY), representing 21.6% of the portfolio. This reflects a high-conviction bet by the institution.
What is Jana Partners Management, LP's historical performance and risk profile?
Our simulation indicates a total return of -8.1% with a win rate of 38%. Notably, the portfolio maintains a Sharpe Ratio of -1.75, suggesting an standard level of risk-adjusted returns compared to the broader market.
What sectors does Jana Partners Management, LP primarily invest in?
Jana Partners Management, LP has a strong preference for the Aerospace & Defense sector, which makes up 21.6% of their disclosed assets. The portfolio also has exposure to Packaged Foods, indicating a specific thematic focus.
Is Jana Partners Management, LP's portfolio concentrated or diversified?
Jana Partners Management, LP runs a highly concentrated portfolio with 9 disclosed positions. The top 3 holdings alone account for 55.6% of the total portfolio weight, suggesting a strategy that favors deep research into a few key names.
How has Jana Partners Management, LP performed in 2026?
Our AI-simulated model portfolio for Jana Partners Management, LP tracks a Year-to-Date (YTD) return of -6.1%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does Barry Rosenstein manage Jana Partners Management, LP directly?
Yes, Barry Rosenstein serves as the key portfolio manager for Jana Partners Management, LP, overseeing the investment strategy and final capital allocation decisions.