(Reuters) – Apple Inc said Chief Financial Officer Peter Oppenheimer would retire at the end of September. Luca Maestri, Apples vice president of finance and corporate controller, will succeed 51-year-old Oppenheimer as CFO, reporting to Chief Executive Tim Cook. Oppenheimer, who joined Apple in 1996 and has been CFO since 2004, will start handing over in June to Maestri, who joined in 2013 from Xerox Corp, where he was CFO.