Our Team

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Mark Serafini

Equity Derivatives Strategist

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I joined O’Neil Securities to help expand the firm’s derivatives research and trading capabilities through innovative strategies that connect fundamental equity research with options-based solutions. The collaborative environment at O’Neil fosters the type of research-driven, analytical approach that has defined my career across trading desks and hedge funds for more than two decades.

Over the course of 25 years, I have developed derivatives strategies across multiple asset classes, including equities, rates, and commodities. I began my career as an Equity Options Volatility Trader with NYSE specialist firms such as Spear Leeds, where I gained a deep understanding of market structure and risk analytics. I later served as a derivatives strategist and trader at Weiss Multi-Strategy Advisers, managing a $250 million systematic macro portfolio. Building on that experience, I founded Paradox Capital Management, a rules-based macro futures and options firm focused on risk mitigation and portfolio hedging, earning multiple Top 10 performance awards from BarclayHedge and IASG.

At O’Neil Securities, I collaborate with colleagues around the world to develop derivatives research and actionable options strategies that help institutional clients enhance returns and manage risk. I focus on transforming the firm’s fundamental insights into options expressions that align with client objectives and market opportunities.

When I’m not at work, I enjoy surfing, mixed martial arts, and CrossFit. I also have a strong interest in complex systems science, particularly system dynamics, and how it applies to real-world phenomena such as weather, traffic, and virology.