Our History

Investment Philosophy Inspired By Legendary Value Investors

  • Prospector Partners began in 1997 when John Gillespie reunited with his mentor, Jack Byrne, who became a founding investor of Prospector. Byrne was the legendary CEO of GEICO (acquired by Berkshire Hathaway), Fireman’s Fund (acquired by AIG), and White Mountains Insurance Group. Warren Buffett referred to Jack Byrne as “the Babe Ruth of insurance.”
  • The portfolio management team at Prospector played prominent roles in managing investments for White Mountains from the late 1990’s until 2015. Much of the investment philosophy at Prospector, approaching value investing from a balance sheet and credit perspective, is inspired by the investing principles of Jack Byrne and Warren Buffett.

Exceptional Returns

Time Proven Strategies

For over 20 years, Prospector Partners has managed long/short and long only equity investment strategies for institutions, family offices, and accredited individual investors. Focusing on our clients first while remaining dedicated to the Prospector process, our long-term, value-based approach has withstood the test of time. Our team has significant personal capital invested in these strategies which serve as the foundation of our firm.