Jim Simons 1938-2025: Quant King and Investment Legend Worth $31.8B Passes Away
Jim Simons, the pioneering mathematician and founder of Renaissance Technologies, has died at 86. Celebrated as the 'Quant King' for revolutionizing quantitative investing, Simons left behind a legacy of groundbreaking math and extraordinary hedge fund returns.
Highlights
- Jim Simons, the iconic mathematician and investor, passed away at 86, as confirmed by the Simons Foundation.
- Dubbed the 'Quant King,' Simons taught at top universities like MIT and Harvard, served as a Vietnam War code-breaker, then founded Renaissance Technologies, a trailblazer in quantitative hedge funds.
- Renaissance's Medallion Fund achieved an astonishing average annual return close to 40% after fees from 1988 through 2023, a record in hedge fund history.
Jim Simons, revered as the 'Quant King,' died at age 86, leaving a lasting impact on both mathematics and finance. His career journey spanned from academia to cryptography during the Vietnam War, ultimately culminating in founding Renaissance Technologies.
Simons prioritized hiring mathematicians and statisticians over traditional Wall Street investors, creating proprietary quantitative models that fueled Renaissance’s remarkable success. Under his leadership as CEO from 1982 to 2010, and later as board member until 2021, the firm’s Medallion Fund consistently outperformed the market.
As of the latest SEC 13F filing in February, Renaissance managed assets totaling approximately $64.61 billion. Simons’s personal net worth was estimated at $31.8 billion, ranking him among the world’s 50 wealthiest individuals at his passing, according to Bloomberg.

The Simons Foundation, co-founded by Jim and his wife Marilyn, has donated billions towards advancing scientific research and education in mathematics and science. Their philanthropic vision continues to inspire breakthroughs in these fields.
David Spergel, president of the Simons Foundation, praised Jim Simons as an extraordinary leader who transformed mathematics and investment. Together with Marilyn, Jim established a lasting legacy through their foundation, which supports fundamental science and autism research worldwide.
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