Renaissance Technologies, the systematic hedge fund firm founded by mathematician and former Cold War code breaker Jim Simons, saw its difficult summer continue in July, as the quant pioneer posted further losses across key strategies, according to a report by Business Insider.

The report cites an unnamed source familiar with the matter as revealing that the Long Island-based firm’s Renaissance Institutional Equities Fund (RIEF) fell 5.1% last month, while its Renaissance Institutional Diversified Alpha strategy declined 3.9%. Despite the pullback, both strategies remain positive for 2025, up 5.6% and 6.5% respectively, but have now suffered losses for two consecutive months.

The declines extend a broader slump for computer-driven hedge funds, with peers such as Qube Research & Technologies, Engineers Gate and Man Group also seeing negative returns over the summer despite rising equity markets. RIEF dropped nearly 6% in June, according to HSBC data.

Some market signals suggest a rebound may be underway. Morgan Stanley estimates quants recouped around 30% of their summer drawdowns in the final week of July, while Goldman Sachs also flagged improving performance trends.