Billionaire investor Warren Buffett told CNBC Monday that Berkshire Hathaway investment managers Ted Weschler and Todd Combs have trailed the S&P 500 by a "tiny bit" since each joined the company.
However, the Berkshire chairman points out that they've done better in the market then he has over the same period of time. He noted it's a tough time to beat the S&P 500.