Berkshire takes bigger bite of Apple, pares Wal-Mart

(Reuters) - Warren Buffett's Berkshire Hathaway Inc on Monday said it has increased its stake in Apple Inc by 55 percent, boosting its bet on the iPhone and iPod maker even as prominent investors like Carl Icahn and George Soros have reduced theirs. Berkshire owned 15.23 million Apple shares worth roughly $1.46 billion as of June 30, up from 9.81 million shares as of March 31, according to a regulatory filing detailing Berkshire's U.S.-listed stock holdings at the end of the second quarter. It w