Key TakeawaysWarren Buffett's Berkshire Hathaway sold more Bank of America stock to end August and start September, trimming its stake in nine straight trading sessions.The latest selling spree comes after the firm sold millions of shares in July after Bank of America stock hit a two-year high following an earnings beat.Berkshire still owns just over 11% of Bank of America's outstanding shares, a stake currently worth about $34.7 billion. Warren Buffett's Berkshire Hathaway (BRK.A, BRK.B) further trimmed it ...