India, July 31 -- Former OpenAI researcher Leopold Aschenbrenner has returned to the spotlight. Reports say his AI hedge fund, Situational Awareness LP, sold the bulk of its public equity portfolio to Ken Griffin's Citadel after suffering steep losses in AI infrastructure stocks.

According to the Financial Times, the fund generated a return of about 439% by the end of June before sentiment toward AI infrastructure stocks deteriorated. Reports cited by multiple outlets said assets under management had climbed as high as $45 billion before falling sharply amid declines in major holdings.

The sell-off reportedly included several public investments. The fund, however, retained private holdings, including a significant stake in Anthropic, on...