Jack Seibald has been involved in the financial markets for more than 40 years, during which time he has accumulated a broad range of experience in the investment business, including investment research, investment management, prime brokerage, and outsourced trading.

As Global Co-Head of Marex’s Prime Brokerage Services and Outsourced Trading, he focuses on accelerating the global expansion of these business lines and introducing new capabilities while continuing to prioritize a highs standard of client service. A key aspect of his role is overseeing a rapidly expanding and highly experienced global team (the former Cowen Prime Brokerage and Outsourced Trading team that transferred to Marex following its acquisition of the business). Together, they have grown a global market leading business, renowned for its buy-side ethos, the depth of its trading capabilities and its global multi-asset class expertise.

Jack is a firm believer in transparency and integrity, with a commitment to delivering the highest levels of service to all clients. In 2022 he was inducted into the Global Custodian Hall of Fame for his contributions to the industry.