Jim Simons' Portfolio Trends: Major Share Increases and Decreases in Q1 2026

Renaissance Technologies LLC, managed by Jim Simons, experienced notable shifts in its top holdings during the most recent quarter, as of December 31, 2025. The $62.9 billion portfolio includes positions in major tech, healthcare, and consumer companies.

Among the most significant changes, Tesla (TSLA) saw a substantial increase of 220.88% in shares, while Netflix (NFLX) experienced a massive 2544.63% jump in holdings. Costco (COST) also showed strong growth with a 5220.96% increase in shares. Micron (MU) added 151.03% more shares, and Palantir (PLTR) increased slightly by 2.7%.

On the other hand, there were notable decreases. United Therapeutics (UTHR) reduced its position by 12.15%, while Kinross Gold (KGC) and Verisign (VRSN) both saw declines of 4.24% and 12.33%, respectively. Exelixis (EXEL) decreased by 10.0%.

For more detailed information on Jim Simons' investment strategy and performance, visit Renaissance Technologies LLC. You can explore each stock's performance and details by visiting their respective pages, such as Tesla (TSLA), Netflix (NFLX), and Costco (COST).