Berkshire Hathaway is arguably always Buffett's favorite stock. But another stock commands a strong second place. Many investors (including me) have observed that Warren Buffett has built a massive cash stockpile for Berkshire Hathaway (BRK.A -0.25%) (BRK.B 0.03%). Many have also noticed Buffett has been a net seller of stocks for seven consecutive quarters. Does this mean the legendary investor can no longer find any stocks he likes? Not at all. Buffett isn't buying many stocks, but he's still buying some. ...