Renaissance Technologies

Founded by Jim Simons (d. 2024); the firm is led by co-CEOs Peter Brown (computational linguist, ex-IBM). The most secretive and most successful quant shop in history.

The archetypal systematic shop. Its legendary Medallion Fund is closed to outside money (since 2005, employees/family only) and famously opaque — Medallion's signals are NOT in the 13F. What IS visible is the long US-equity book underlying the external institutional vehicles, RIEF (Renaissance Institutional Equities Fund) and RIDA, which run a more capacity-tolerant, lower-turnover statistical strategy. The 13F surfaces real AI-trade exposure: a boosted NVDA stake, Micron (memory/HBM for AI), and a sizeable Palantir position — but read it as model output, not human conviction.