No. 63United States
Marilyn Simons & family
Hedge funds · East Setauket, New York
Net worth
$36.6B
Today
−$66−0.00%Past month
+$100K+0.00%As of Nov 11, 2026, 1:50 PM EST
Marilyn Simons is the widow of Jim Simons, the founder of quantitative hedge fund Renaissance Technologies, who died in 2024 at age 86. She got a Ph.D. in economics from Stony Brook University, where she met Jim. She chairs the $4.5 billion (assets) Simons Foundation, which is the primary funder of Math for America. Simons also sits on the boards of her alma mater Stony Brook University's foundation and Rockefeller University, and she chairs the board of Cold Spring Harbor Laboratory. The Simons family has given more than $10 billion to philanthropic causes including Math for America, autism research and Stony Brook.
Net worth over time
+0.00%+$100K over the past month
$37B$37B$37B
Oct 12Nov 11
Principal holdings
1 positions| Company | Industry | Share | Value |
|---|---|---|---|
Private holdings | Finance & Investments | 100.0% | $36.6B |