Zipcar Inc., the Cambridge-based car-sharing service, said it has exercised its option to buy a majority ownership interest in Catalunya Carsharing SA, known as Avancar.
Avancar operates a fleet of vehicles in the Spanish cities of Barcelona and Sant Cugat del Valles.
“The transaction is expected to be completed in early 2012, and builds on Zipcar’s initial equity investment in Avancar in December 2009,’’ the company said in a news release. “With this transaction, Zipcar increases its percentage ownership in Avancar to a controlling stake of 60 percent.’’