Robert Litterman, chairman of Goldman Sachs Group Inc.’s quantitative hedge-fund group, will step down at the end of this month, a move planned before President Barack Obama’s call yesterday to limit proprietary trading at banks, according to people familiar with the situation.

Litterman, a 24-year Goldman Sachs veteran, advised a unit that ran Global Equities Opportunities, a quantitative hedge fund that required a $3 billion cash infusion in 2007. The fund, which used mathematical models to trade securities, closed last month after its assets fell to $200 million from as much as $7.5 billion, according to two people familiar with the situation.

Litterman’s departure was not connected to the fund’s closure, the people said. Global Equities and Goldman Sachs’s Global Alpha fund lost value in August 2007 when many quantitative managers raced to exit trades simultaneously. In June 2008, Litterman said the hedge funds suffered because they were too large for a “de-leveraging explosion.”

Advantage zyaada | Litterman Said to Retire From Goldman Sachs Hedge-Fund Unit – BusinessWeek.

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