Subway Sandwiches & Salads is being sold to affiliates of the private-equity firm Roark Capital Group Inc. for an undisclosed price, the Wall Street Journal reported on Thursday. That price was $9.6 billion, the newspaper reported on Monday, citing people familiar with the process. The company has now confirmed the deal, according to the newspaper. Roark Capital is acquiring the company from two families that have controlled the sandwich chain for nearly 60 years, with most of the sale proceeds going toward foundations affiliated with the founders.