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683 Capital Management, LLC
Ari Zweiman · Hedge Fund · Event-Driven
683 Capital Management, LLC is a New York-based investment firm founded in May 2006 by Ari Zweiman. Registered as an investment adviser with the SEC since 2012, the firm operates primarily as a hedge fund focused on delivering superior risk-adjusted returns for institutional and high-net-worth clients. The firm is characterized by its opportunistic and value-oriented approach, specializing in identifying market inefficiencies across various asset classes. With a relatively small, focused team, 683 Capital manages approximately $2 billion in assets, employing a flexible strategy that adapts to changing market conditions and dislocations.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +58.5% |
| YTD return | +25.6% |
| Sharpe ratio | 3.30 |
| Win rate | 48% |
| AUM | $0.7B |
| Inception | Oct 1, 2025 |
| Updated | Sep 4, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $0.7B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | http://683capital.com |
Current Holdings
Updated on Sep 4, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| COF | Capital One Financial Corporation | 11.8% | +8.4% |
| CVNA | Carvana Co | 8.3% | +9.1% |
| KSPI | Joint Stock Company Kaspi.kz | 7.5% | +27.8% |
| BDX | Becton Dickinson and Company | 7.0% | +21.3% |
| AMLX | Amylyx Pharmaceuticals Inc | 6.8% | +124.3% |
| PTGX | Protagonist Therapeutics Inc | 6.2% | +94.9% |
| ANAB | AnaptysBio Inc | 5.5% | +23.1% |
| MOH | Molina Healthcare Inc | 4.9% | +20.4% |
| TRAX | First Tracks Biotherapeutics | 4.9% | -7.1% |
| MGTX | MeiraGTx Holdings PLC | 4.7% | +65.8% |
| HGV | Hilton Grand Vacations Inc | 4.5% | -6.6% |
| QURE | Uniqure NV | 4.2% | -4.9% |
| U | Unity Software Inc | 4.0% | -4.2% |
| WVE | Wave Life Sciences Ltd | 3.7% | -34.8% |
| AMTM | Amentum Holdings Inc. | 3.3% | -16.2% |
| TGTX | TG Therapeutics Inc | 3.2% | +38.9% |
| SRPT | Sarepta Therapeutics Inc | 2.5% | +6.7% |
| PHAT | Phathom Pharmaceuticals Inc | 2.4% | +1.2% |
| SE | Sea Ltd | 2.4% | -6.0% |
| KNOP | KNOT Offshore Partners LP | 2.4% | +3.7% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Aug 31, 2026 | BUY | MOH | 4.9% → 4.9% |
| Aug 31, 2026 | BUY | SRPT | 0.0% → 2.5% |
| Aug 31, 2026 | BUY | BDX | 6.1% → 7.0% |
| Aug 31, 2026 | SELL | ELV | 2.4% → 0.0% |
| Aug 31, 2026 | SELL | GXO | 3.6% → 0.0% |
Investment Style Analysis
683 Capital Management, LLC is widely recognized for employing a Event-Driven strategy. As of Sep 4, 2026, the firm oversees approximately $0.7B in assets under management (AUM). The portfolio demonstrates a clear preference for the Biotechnology and Credit Services sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Aug 31, 683 Capital Management, LLC made a significant move by increasing exposure to MOH. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
The institution's investment philosophy centers on identifying discrepancies between the intrinsic economic value of a business and its market price through rigorous fundamental research. The strategy is opportunistic and multi-faceted, frequently engaging in event-driven themes such as spinoffs, parent-stub trades, broken IPOs, and companies emerging from bankruptcy. 683 Capital maintains a portfolio that is typically net-long and may utilize mild leverage and derivative instruments, including puts and calls, to manage risk and enhance returns. The firm's research-driven process involves detailed examination of balance sheets and cash flows, focusing on assets that can be repurposed or are trading below replacement cost during cyclical lows.
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 683 Capital Management, LLC.
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Frequently asked questions
How is the simulated portfolio for 683 Capital Management, LLC 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 683 Capital Management, LLC's largest holding?
As of the latest filing, 683 Capital Management, LLC's top position is Capital One Financial Corporation (COF), representing 11.8% of the portfolio. This reflects a high-conviction bet by the institution.
What is 683 Capital Management, LLC's historical performance and risk profile?
Our simulation indicates a total return of +58.5% with a win rate of 48%. Notably, the portfolio maintains a Sharpe Ratio of 3.30, suggesting an exceptional level of risk-adjusted returns compared to the broader market.
What sectors does 683 Capital Management, LLC primarily invest in?
683 Capital Management, LLC has a strong preference for the Biotechnology sector, which makes up 44.0% of their disclosed assets. The portfolio also has exposure to Credit Services, indicating a specific thematic focus.
Is 683 Capital Management, LLC's portfolio concentrated or diversified?
683 Capital Management, LLC runs a moderately concentrated portfolio with 20 disclosed positions. The top 3 holdings alone account for 27.5% of the total portfolio weight, suggesting a strategy that favors broader market exposure.
How has 683 Capital Management, LLC performed in 2026?
Our AI-simulated model portfolio for 683 Capital Management, LLC tracks a Year-to-Date (YTD) return of +25.6%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does Ari Zweiman manage 683 Capital Management, LLC directly?
Yes, Ari Zweiman serves as the key portfolio manager for 683 Capital Management, LLC, overseeing the investment strategy and final capital allocation decisions.