Warren Buffett ups stake in Apple, cuts Walmart

Warren Buffett's Berkshire Hathaway (BRK.B) hiked its investment in Apple (AAPL) and reduced its stake in companies including Walmart (WMT) in the second quarter, according to a regulatory filing.

The billionaire's company held 15.2 million shares of Apple as of June 30, up from 9.81 million on March 31.

Berkshire held 40.2 million shares in Walmart, down from 55.2 million three months earlier.