(This is the Warren Buffett Watch newsletter, news and analysis on all things Warren Buffett and Berkshire Hathaway. You can sign up here to receive it every Friday evening in your inbox.) During Warren Buffett's last quarter as CEO, Berkshire Hathaway sold more equities than it bought, continuing to whittle away at its big Apple and Bank of America stakes and slashing its already modest Amazon.com holding. Berkshire significantly increased its stakes in Chevron and Chubb in the three months