Ken Griffin says Citadel unwound more than 80% of risk tied to Situational Awareness portfolio

Ken Griffin, founder and CEO of multinational hedge fund Citadel, speaks during the 29th annual Milken Institute Global Conference at the Beverly Hilton in Beverly Hills, California on May 5, 2026.Patrick T. Fallon | AFP | Getty ImagesKen Griffin of Citadel in a letter to clients on Friday addressed the firm's purchase of assets from Leopold Aschenbrenner's Situational Awareness hedge fund. According to a letter obtained by CNBC's Sara Eisen, Griffin told clients that Citadel has unwound more than 80% of the aggregate risk from the original portfolio purchased by conducting more than 100 block trades over $4 billion in market value. Griffin detailed in the letter that Citadel entered discussions with Situational Awareness to acquire some of the fund's holdings on July 29. One day later, CN