Biotech hedge funds couldn't escape a tough October, sources told Insider. Managers like Perceptive Advisors and RTW Investments lost more than 9% in just a month's time. While big-name hedge funds were able to avoid some of the market's pain last month, biotech specialists were hit hard. Some funds, including Perceptive Advisors, RTW Investments, and San Francisco-based Redmile Group, had a tough October thanks to pain across the biotech space, according to sources familiar with their performance. The flagship fund at $8 billion Perceptive Advisors, run by billionaire Joseph Edelman, lost 9.5% in the month, bringing its yearly performance to a loss of 8.7%.

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Persons: Joseph Edelman, Davidson Kempner, Roderick Wang Organizations: Biotech, RTW Investments Locations: Moderna, San Francisco