Jim Simons
Portfolio
How position sizing, concentration, and risk fit the style.
Holdings and trading positions
Jim Simons's best-known portfolio, Renaissance Technologies' Medallion Fund, is private and highly dynamic. Its trades cannot be reconstructed from public filings. Renaissance's disclosed U.S. equities belong to the firm and its various funds, not automatically to Simons or Medallion.
Known portfolio components
Equity statistical-arbitrage baskets: Medallion traded many long and short equity positions whose small relative-pricing signals were meaningful only as a combined portfolio.
Futures: Commodity, interest-rate, and equity-index contracts allowed systematic exposure across liquid global markets.
Currencies: Short-horizon foreign-exchange signals formed another source of diversified return.
Options and other derivatives: Derivatives could express or hedge statistical patterns while controlling the desired exposure.
Renaissance institutional funds: Renaissance Institutional Equities Fund and related products serve outside investors with longer horizons and greater capacity than Medallion.
Quarterly 13F positions: Renaissance reports thousands of U.S.-listed holdings. Large reported names can reflect hedges, factor exposure, or rapid trading and should not be read as long-term endorsements.
Current-status caveat
Simons stepped back from day-to-day management and died in 2024. Current Renaissance positions belong to the firm and its funds; Medallion remains closed to outside investors and its live portfolio is confidential.
How to read this list
The portfolio is the diversified system, not a handful of top 13F rows. Strategy details belong in Decision Framework, while notable periods belong in Best Investments.