Private equity and asset management firm Apollo Global Management said Marc Spilker would step down as president and member of the executive committee.
Spilker will stay on as an adviser until the end of the year, Apollo said in a statement on Thursday without saying why he was stepping down.
Spilker joined Apollo as president in December 2010 after retiring from Goldman Sachs, where he spent 20 years and left as co-head of the bank's investment management division.
"Marc leaves a firm that has fulfilled the vision it set for itself to become a successful public company and to put in place the infrastructure and resources it requires," said Leon Black, Apollo's co-founder, chairman and chief executive.
Apollo's statement on Thursday made no mention of any plans to replace Spilker.
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The company, which has a market value of about $5 billion, went public in March 2011.
Spilker, 49, graduated with degree in economics from the Wharton School of the University of Pennsylvania.
Apollo's shares closed at $32.54 on Wednesday on the New York Stock Exchange. (Click here to see what the stock is doing now)