Jim Simons

James Harris Simons was a prominent American mathematician and hedge fund manager known for founding Renaissance Technologies, a leading quantitative hedge fund. Simons, often regarded as the most successful hedge fund manager of all time, utilized mathematical models and algorithms to exploit market inefficiencies, achieving extraordinary long-term returns through his Medallion Fund. His innovative approach to investing has earned him recognition as one of the greatest investors on Wall Street. Renaissance Technologies, established in 1982, specializes in systematic trading, leveraging quantitative models derived from statistical analysis. Under Simons' leadership, the firm has developed a reputation for its data-driven investment strategies, which have consistently outperformed traditional investment methods. The firm's focus on technology and mathematics has reshaped the landscape of hedge fund management and investment philosophy. The disclosed trading record for Jim Simons shows significant activity through 200 13F filings, with the latest disclosure dated May 14, 2026. Notably, the firm has engaged in position reductions, exits, and increases, with a reported range of $780.6 million to $19.4 million. Among the top sectors represented in their portfolio are Technology, Financial Services, and Consumer Cyclical, with significant positions in companies such as Apple Inc (AAPL) and Tesla Inc (TSLA). The largest disclosed move involved Apple Inc, reflecting a strategic adjustment valued at approximately $780.6 million.