Berkshire Hathaway A (BRK.A.N) slashed its stake in Apple (AAPL. O) to about 400 million shares in the second quarter from 789 million in Quarter 1, a drop of nearly 50 percent, according to a 10-Q report released Saturday. Berkshire Hathaway currently owns about 2.6 percent of Apple, worth about $88 billion at Friday's closing price of $219.86. The reduction in Apple shares is not surprising, but the scale of the reduction is unexpected.