The rest is history, as Apple's sales growth returned and the stock increased from its bargain price tag to a more respectable figure. However, the stock looks like it has gotten a bit too expensive. Purchasing Apple (AAPL 0.49%) stock during his tenure at Berkshire Hathaway (BRK.A 0.18%) (BRK.B 0.09%) will be one of Warren Buffett's top legacies. Apple stock has performed well since Berkshire first bought shares in Q1 2016, and has spent a lot of time as the world's largest company (although it currently d ...