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Group One Trading LLC
John Anthony Kinahan · Hedge Fund · Quant/Systematic
Group One Trading LLC is a leading options market maker and specialist firm founded in 1989 in San Francisco. Now headquartered in Chicago, the firm is one of the largest privately held options trading entities in the United States, maintaining a significant presence across major exchange groups including the CBOE, NYSE, and NASDAQ. The institution specializes in providing competitive liquidity for thousands of exchange-listed derivatives and equity securities. Group One is distinguished by its proprietary high-performance technology, real-time risk management systems, and a rigorous analyst training program that develops internal trading talent. Over the decades, it has expanded from a local floor presence to a global electronic trading participant while remaining focused on the derivatives landscape.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +25.2% |
| YTD return | +20.9% |
| Sharpe ratio | 3.24 |
| Win rate | 45% |
| 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 | https://www.group1.com |
Current Holdings
Updated on Sep 4, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| TSM | Taiwan Semiconductor Manufacturing | 11.8% | +4.9% |
| MU | Micron Technology Inc | 9.7% | +54.0% |
| KKR | KKR & Co LP | 7.7% | +7.7% |
| UNH | UnitedHealth Group Incorporated | 7.3% | +0.7% |
| MRVL | Marvell Technology Group Ltd | 5.9% | +3.3% |
| BKNG | Booking Holdings Inc | 5.7% | -5.7% |
| OSCR | Oscar Health Inc | 5.2% | +30.1% |
| PLTR | Palantir Technologies Inc. | 4.3% | -6.3% |
| DASH | DoorDash, Inc. Class A Common Stock | 4.3% | -10.5% |
| MSTR | MicroStrategy Incorporated | 4.1% | +12.0% |
| MRNA | Moderna Inc | 4.1% | +6.5% |
| PDD | PDD Holdings Inc. | 3.8% | -3.8% |
| CI | Cigna Corp | 3.7% | +1.4% |
| CHTR | Charter Communications Inc | 3.6% | -1.1% |
| PFE | Pfizer Inc | 3.5% | +2.1% |
| NVDA | NVIDIA Corporation | 3.5% | +6.1% |
| MAR | Marriott International Inc | 3.3% | +8.1% |
| SLB | Schlumberger NV | 3.1% | +0.6% |
| LITE | Lumentum Holdings Inc | 2.9% | -1.8% |
| ET | Energy Transfer LP | 2.6% | +5.4% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Aug 31, 2026 | BUY | PDD | 0.0% → 3.8% |
| Aug 31, 2026 | BUY | TSM | 8.2% → 11.8% |
| Aug 31, 2026 | SELL | COHR | 3.1% → 0.0% |
| Aug 31, 2026 | BUY | MRNA | 0.0% → 4.1% |
| Aug 31, 2026 | BUY | MRVL | 0.0% → 5.9% |
Investment Style Analysis
Group One Trading LLC is widely recognized for employing a Quant/Systematic 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 Semiconductors and Healthcare Plans sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Aug 31, Group One Trading LLC made a significant move by increasing exposure to PDD. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
Group One Trading focuses on a quantitative and systematic approach to market making in the options and equity markets. The firm’s philosophy centers on the integration of cutting-edge proprietary technology with real-time risk management to provide consistent liquidity across thousands of financial instruments. By maintaining a balance between physical floor presence and automated electronic quoting, Group One seeks to capitalize on pricing opportunities and special situations. Their strategy relies heavily on a collaborative environment and an extensive training program, ensuring that traders and developers work together to adapt quickly to evolving market structures and maintain a competitive edge in high-frequency trading environments.
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 Group One Trading LLC.
Similar Investment Style
Based on Quant/Systematic.
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Frequently asked questions
How is the simulated portfolio for Group One Trading 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 Group One Trading LLC's largest holding?
As of the latest filing, Group One Trading LLC's top position is Taiwan Semiconductor Manufacturing (TSM), representing 11.8% of the portfolio. This reflects a high-conviction bet by the institution.
What is Group One Trading LLC's historical performance and risk profile?
Our simulation indicates a total return of +25.2% with a win rate of 45%. Notably, the portfolio maintains a Sharpe Ratio of 3.24, suggesting an exceptional level of risk-adjusted returns compared to the broader market.
What sectors does Group One Trading LLC primarily invest in?
Group One Trading LLC has a strong preference for the Semiconductors sector, which makes up 30.8% of their disclosed assets. The portfolio also has exposure to Healthcare Plans, indicating a specific thematic focus.
Is Group One Trading LLC's portfolio concentrated or diversified?
Group One Trading LLC runs a moderately concentrated portfolio with 20 disclosed positions. The top 3 holdings alone account for 29.2% of the total portfolio weight, suggesting a strategy that favors broader market exposure.
How has Group One Trading LLC performed in 2026?
Our AI-simulated model portfolio for Group One Trading LLC tracks a Year-to-Date (YTD) return of +20.9%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does John Anthony Kinahan manage Group One Trading LLC directly?
Yes, John Anthony Kinahan serves as the key portfolio manager for Group One Trading LLC, overseeing the investment strategy and final capital allocation decisions.