Berkshire Hathaway's stake in Apple appears to be a bet that the Cupertino company's stock will rebound, following its first ever year-over-year revenue drop in 13 years. The slump comes after Apple's April earnings call where it announced the first ever drop in iPhone sales in the 9 years that the smartphone has been on the market. Last week, shares of the company fell below $90 for the first time in nearly two years, but after Berkshire Hathaway's disclosure, Apple's stock price rose 2.2 percent to $92.50 in early trading Monday morning.