Karl Kroeker, who specialized in tech, worked nearly 14 years at Citadel and left earlier in February, according to one of the people. He was a portfolio manager in Citadel's Global Equities unit in San Francisco and has not yet been replaced, the person said.

“Citadel has decided to consolidate Ravelin Capital into our Citadel Global Equities business," a spokesman for Citadel told Business Insider at the time. "This decision will further strengthen Global Equities by incorporating the best ideas and strongest talent from Ravelin.”

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Three units remain at Citadel: Surveyor, Global Equities and Aptigon.

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