RenTech

Founded in 1982 by mathematician James Simons, Renaissance Technologies is a quantitative hedge fund that specializes in systematic trading using complex mathematical models and statistical analyses. The firm is famous for its "Medallion Fund," a black-box strategy open only to the firm's owners and employees, which has historically generated exceptionally high returns. The company is known for hiring specialists with non-financial backgrounds, such as mathematicians, physicists, and computer scientists, to develop its sophisticated trading algorithms.