The math-only market
The codebreaker who beat markets with pure statistics: Renaissance's Medallion fund compounded ~66% gross a year for three decades by finding fleeting patterns no human thesis could see — and Simons never once needed an opinion about a company to do it.
Net worth at passing (est.)
Estimatedyearly estimates from public reporting · risk pane = rolling volatility, the standard deviation of annual growth wealth managers useThe allocation
Estimatedmodeled from public reporting — a wealth manager's sketch, not a statementThe internal fund, employees & family only
Returns
Estimated~39% net of the famous 5-and-44 fees
Legacy profile — Renaissance and the foundation carry on
Portfolio highlights
public & private — widely reported positions; weights are member-gated- Medallion Fundfund
The internal anomaly — family retains interests
- Simons Foundation endowmentfund
The science legacy
Private allocations
best public information — stakes and terms mostly undisclosed$5B+ endowment for math and basic science
The family's outside-Medallion book
The pillars
- Models decide everything; humans just improve the models
- Hire scientists, never Wall Street
- Capacity discipline: Medallion stayed small and internal on purpose
Signature moves
- Medallion: ~66% gross/yr for 30+ years — the best track record in investing history
- Capped the fund and returned profits annually so the anomaly never diluted
The tax playbook
Editorialstrategies widely reported around Simons — never tax adviceThe basket-option fight
Renaissance's use of basket options to convert short-term trading gains into long-term rates drew a decade-long IRS battle — settled in 2021 for a reported ~$7B, the largest such settlement ever. The lesson: even the best math defers to the code eventually.
Foundation-scale giving
Billions moved to the Simons Foundation during his lifetime — appreciated fund interests funding basic science, with the standard charitable-transfer efficiencies at extraordinary scale.
Compiled from public reporting on structures these investors are widely reported to use. Tax outcomes depend entirely on individual circumstances — this is background reading, not tax advice.
On the wire
tracked filings & reports — live from SEC EDGAR and pressLoading the wire…
Recent moves
from public filings & press — quarter-level, not live data- ARCHIVEArchive
Died May 2024 at 86; Renaissance continues, Medallion still closed to the world
- SIGNAL2024
The foundation committed further billions to math and autism research
Sources
Where this profile's information comes from — filings first.
This profile is an editorial summary compiled from public sources. Allocation, return, and prediction figures are MODELED ESTIMATES — informed guesses, not verified data; predictions are illustrative scenarios only. No affiliation with or endorsement by Jim Simons is implied, and nothing on this page is investment advice.