Warren Buffett (Trades, Portfolio)'s firm made a notable adjustment in its investment portfolio by reducing its stake in Bank of America Corp (NYSE:BAC). Following this move, the firm still holds a substantial number of shares,

If Berkshire drops its stake under 10%, it will no longer have to file with the SEC for any changes in its Bank of America holding within two business days. Berkshire would have t

After the update, Ally's stock plummeted close to 20% and now sits at about $33. The largest investor in Ally is Berkshire Hathaway, the conglomerate run by legendary investor Warren Buffett. The company has held its shares in Ally even though it has trimmed the majority of its exposure to the banking sector in the past year or two.