Jeff Runnfeldt, co-head of Citadel’s global equities group, is leaving after a decade at the hedge fund.
Mr. Runnfeldt plans to retire, and his last day is Aug. 31, said Katie Spring, a spokeswoman for the $12 billion firm, in an e-mail.
Mr. Runnfeldt became co-head of global equities in 2009, along with Brandon Haley and Steve Weller, when Citadel started its equity fund.
Mr. Runnfeldt’s $2.5 billion fund has returned about 10.3% this year through mid-August, according to a person with knowledge of the returns. The S&P 500 gained 13%, including reinvested dividends, through the same period. Equity hedge funds have returned 2.8%, according to the HFRX Equity Hedge index.
Mr. Runnfeldt joined Citadel in 2002 and was named head of financials in 2004.