Renaissance Technologies is a large fund with a concentrated portfolio. Top 3 positions are 40% of the equity book.
Renaissance Technologies, a quant hedge fund overseeing $64.46B in disclosed equity holdings (SEC CIK 0001037389). The latest portfolio (2025Q4) discloses 3185 positions across 11 sectors, with the largest positions in PLTR, UTHR and MU. On a mark-to-market basis the tracked portfolio has returned 38.3% over the past year. OpenStocks tracks 40 consecutive quarterly snapshots for this manager — every position change, new entry, and exit is logged below.