Few investors are as influential as Warren Buffett, although for the moment, the market is ignoring his caution. The annual meeting of Berkshire Hathaway revealed Buffett did not use the heavy market falls in February to buy shares. Rather than 'buy when others are fearful', he was a net seller of US$6 billion for the quarter, disposing of all airline shares. Berkshire is sitting on US$137 billion in cash, suggesting he expects better buying opportunities to come.