 According to regulatory filings, CEO Warren Buffett and his team purchased another 21.2 million shares of the bank between Tuesday and Thursday of this week for a total cost of 522 million, or an average price of 24.65 per share. Last week, Berkshire spent more than 800 million to buy 34 million shares of Bank of America, and quickly followed that by spending an additional 400 million on the stock. 