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Parallax Volatility Advisers, L.P.
William Frederick Bartlett · Hedge Fund · Quant/Systematic
Parallax Volatility Advisers, L.P. is a San Francisco-based investment firm specializing in global equity and index derivatives. Established in 1996, the firm has built a reputation for its expertise in volatility trading, seeking to capture alpha through sophisticated relative value strategies. Parallax utilizes a quantitative investment approach, leveraging advanced mathematical models and proprietary algorithms to identify mispriced volatility across financial markets. The firm primarily serves institutional clients, including pension funds and hedge funds, by offering strategies designed to achieve returns with low correlation to traditional asset classes. With a focus on disciplined risk management and deep understanding of market dynamics, Parallax manages a suite of funds targeting attractive risk-adjusted exposures through the active trading of options and other derivative instruments.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +12.6% |
| YTD return | +10.1% |
| Sharpe ratio | 1.93 |
| Win rate | 50% |
| AUM | $0.9B |
| Inception | Oct 1, 2025 |
| Updated | Sep 18, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $0.9B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | https://www.parallaxfund.com/ |
Current Holdings
Updated on Sep 18, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| NVDA | NVIDIA Corporation | 29.7% | +2.0% |
| AMZN | Amazon.com Inc | 6.0% | -4.4% |
| INTC | Intel Corporation | 4.9% | -0.0% |
| GS | Goldman Sachs Group Inc | 4.8% | -6.3% |
| BABA | Alibaba Group Holding Ltd | 4.5% | -17.2% |
| XOM | Exxon Mobil Corp | 4.4% | +5.0% |
| MU | Micron Technology Inc | 4.2% | +26.0% |
| GOOGL | Alphabet Inc Class A | 4.2% | -8.7% |
| WMT | Walmart Inc. Common Stock | 3.9% | +3.6% |
| AMAT | Applied Materials Inc | 3.9% | -3.8% |
| CVX | Chevron Corp | 3.8% | +9.9% |
| NFLX | Netflix Inc | 3.7% | -16.9% |
| C | Citigroup Inc | 3.4% | +25.5% |
| DELL | Dell Technologies Inc | 3.0% | +24.0% |
| META | Meta Platforms Inc. | 2.8% | +15.6% |
| CSCO | Cisco Systems Inc | 2.8% | -0.6% |
| BX | Blackstone Group Inc | 2.6% | -12.6% |
| AAPL | Apple Inc | 2.5% | +8.9% |
| CI | Cigna Corp | 2.5% | -2.8% |
| JPM | JPMorgan Chase & Co | 2.4% | -2.7% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Sep 7, 2026 | BUY | XOM | 4.4% → 4.4% |
| Sep 7, 2026 | SELL | FCX | 2.6% → 0.0% |
| Sep 7, 2026 | BUY | MU | 4.0% → 4.2% |
| Sep 7, 2026 | SELL | BABA | 4.8% → 4.5% |
| Sep 7, 2026 | BUY | CI | 0.0% → 2.5% |
Investment Style Analysis
Parallax Volatility Advisers, L.P. is widely recognized for employing a Quant/Systematic strategy. As of Sep 18, 2026, the firm oversees approximately $0.9B in assets under management (AUM). The portfolio demonstrates a clear preference for the Semiconductors and Internet Retail sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Sep 7, Parallax Volatility Advisers, L.P. made a significant move by increasing exposure to XOM. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
The firm’s investment philosophy centers on a quantitative and disciplined approach to volatility as an asset class. Parallax seeks to identify and exploit dislocations in the volatility surface by employing global relative value strategies. By utilizing proprietary mathematical models and execution technology, the firm aims to generate absolute returns that are largely independent of market direction. Their strategy focuses on maintaining a diverse portfolio of volatility exposures, primarily through US and non-US options contracts, while strictly adhering to robust risk management protocols to mitigate downside risk in various market 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 Parallax Volatility Advisers, L.P..
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Frequently asked questions
How is the simulated portfolio for Parallax Volatility Advisers, L.P. 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 Parallax Volatility Advisers, L.P.'s largest holding?
As of the latest filing, Parallax Volatility Advisers, L.P.'s top position is NVIDIA Corporation (NVDA), representing 29.7% of the portfolio. This reflects a high-conviction bet by the institution.
What is Parallax Volatility Advisers, L.P.'s historical performance and risk profile?
Our simulation indicates a total return of +12.6% with a win rate of 50%. Notably, the portfolio maintains a Sharpe Ratio of 1.93, suggesting an strong level of risk-adjusted returns compared to the broader market.
What sectors does Parallax Volatility Advisers, L.P. primarily invest in?
Parallax Volatility Advisers, L.P. has a strong preference for the Semiconductors sector, which makes up 38.8% of their disclosed assets. The portfolio also has exposure to Internet Retail, indicating a specific thematic focus.
Is Parallax Volatility Advisers, L.P.'s portfolio concentrated or diversified?
Parallax Volatility Advisers, L.P. runs a moderately concentrated portfolio with 20 disclosed positions. The top 3 holdings alone account for 40.6% of the total portfolio weight, suggesting a strategy that favors broader market exposure.
How has Parallax Volatility Advisers, L.P. performed in 2026?
Our AI-simulated model portfolio for Parallax Volatility Advisers, L.P. tracks a Year-to-Date (YTD) return of +10.1%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does William Frederick Bartlett manage Parallax Volatility Advisers, L.P. directly?
Yes, William Frederick Bartlett serves as the key portfolio manager for Parallax Volatility Advisers, L.P., overseeing the investment strategy and final capital allocation decisions.