Tiger Global, Whale Rock and D1 Capital Partners were among several prominent hedge funds to suffer significant losses in October as concerns over artificial intelligence investment and technology valuations triggered a sharp equity market selloff, according to a report by Bloomberg.

Tiger Global's flagship hedge fund declined 8.5% during the month, leaving its performance broadly flat for 2026, while Whale Rock's flagship fund fell approximately 8%, reducing its year-to-date gain to around 34%. Dan Sundheim's D1 Capital Partners lost 4.4% in its equity portfolio, bringing its annual return down to 18.8%.

Atreides Management experienced even steeper losses, with its $3.4bn flagship public-private investment fund declining 9.5% in October, although it remained up approximately 43% for the year, supported by investments in SpaceX and other privately held technology businesses. Its smaller hedge fund fell 16%, reducing its year-to-date return to 2.5%. Tiger Global's smaller crossover fund also declined 3.3%, trimming its annual gain to 15.3%.

The losses followed a widespread retreat from technology and semiconductor stocks as investors questioned the financing requirements and profitability of the AI infrastructure buildout. Selling pressure continued into November following the US midterm elections, with the Nasdaq Composite falling 5.5% on Thursday, its steepest daily decline since April 2025.

Coatue Management was among the few major technology-focused hedge funds to avoid significant losses, with Philippe Laffont's flagship strategy gaining 0.2% in October and bringing its year-to-date return to 13%.