Steve Weller, co-head of Citadel’s global equities group, left after more than a decade at the hedge fund run by Kenneth Griffin, according to two people familiar with the matter.
Mr. Weller departed from the firm last week, said the people, who asked not to be identified because the information is private.
Brandon Haley, who ran the group with Mr. Weller, was picked as the unit’s sole head, Katie Spring, a spokeswoman for Citadel, confirmed by phone Monday.
Investors were told about the management change on Feb. 6, Ms. Spring said.
Citadel, which oversees $14 billion, chose to have one person running the equity business rather than a shared management role, Ms. Spring confirmed.
Mr. Weller didn’t return messages left on his home phone seeking comment.