A unit of Goldman Sachs is in talks to buy a stake in Permira, a large international private equity firm, according to people familiar with the matter.

In the deal being discussed, Petershill, an arm of Goldman Sachs that invests directly in alternative investment firms, would pay €500m, or about $560m, for a minority stake in Permira, the people said. The potential deal would value the buyout firm at more than $5bn, one of the people said.