THE MATHEMATICIAN WHO SOLVED THE MARKET · RENAISSANCE TECHNOLOGIES

Jim Simons

Pure quant: mathematical models and data, zero human intuition in trading decisions.

Jim Simons was a world-renowned mathematician — the Chern-Simons theory bears his name — and a codebreaker for US intelligence before founding Renaissance Technologies in 1982. His idea: the market contains statistical patterns that models can exploit, without understanding or forecasting the economy.

The Medallion fund is finance's absolute legend: roughly 66% gross per year (39% net, after 5-and-44 fees) for over thirty years. Closed to outsiders since 1993, reserved for employees: its returns have no documented equivalent.

Renaissance hires physicists, mathematicians and computational linguists — almost never finance people. Simons, who died in 2024, donated billions to mathematical and scientific research.

Famous moves

The Medallion Fund: ~66% gross annually for thirty years, the most perfect money machine ever built
Closing the fund to outside investors in 1993: the returns were too precious to share
Billions donated to basic research through the Simons Foundation

What are they buying today?

Big funds' moves are public in SEC 13F filings: InsiderFlow tracks and explains them.

Frequently asked questions

How did Medallion earn so much?

The secret is guarded: all that's known is it exploits thousands of short-term statistical signals with leverage and execution refined over decades.

Can I invest in Renaissance?

Medallion has been closed for decades; the public funds (RIEF) use different strategies, with far more ordinary results.