Investment guru Warren Buffett confirmed Wednesday the trimming of his Apple, Inc. (NASDAQ:AAPL) stake and finally shed light on the mystery stock his firm, Berkshire Hathaway, Inc. (NYSE:BRK) (NYSE:BRK), accumulated ahead of the first quarter. Apple, Chevron Trimmed: Berkshire reduced its Apple position by a little over 116 million. The firm now owns 789,368,450 Apple shares valued at $135.36 billion, a 13F filing shows. This is the second straight quarter that the Buffett-led company has dilut