MOUNTAIN VIEW (AP) — An unorthodox stock split designed to ensure Google CEO Larry Page and fellow co-founder Sergey Brin retain control of the Internet’s most profitable company could cost Google more than half a billion dollars. Page, 42, and Brin, 41, have maintained control over Google since they started the company in a rented Silicon Valley garage in 1998. Their ideas and leadership have spawned one of the world’s best known and most powerful companies with a market value of $368 billion and a payroll of about 54,000 employees.