He also closed out 16 of the portfolio's smallest stock positions, including Amazon (AMZN +0.82%). Abel sold all of Berkshire's 2.3 million Amazon shares in his first quarter as CEO. Amazon's revenue increased 20% year over year in the second quarter, driven by a 37% increase in AWS sales. It's up 43% from the middle of the first quarter, an average guess for when Abel might have sold it. A number of Wall Street analysts raised their 12- to 18-month price target on Amazon stock after the report, and the long-term outlook is finally starting to look realistic to investors.