Tim Cook is handing over the Apple CEO role to John Ternus on Sept 1, though he will stay on as executive chairman. While his tenure included new product launches and a shift to subscription services, a large part of his legacy is the company's share repurchase program. Since 2013, Apple has spent $878.5 billion on stock buybacks. This reduced their total outstanding share count by 44.5%. The buybacks had a direct impact on the stock by increasing earnings per share and keeping the P/E ratio lower than it otherwise would be. With Cook remaining on the board and the company still generating strong cash flow, the buyback strategy is expected to continue under Ternus.