Buffett: It's 'harder' to buy back shares of Berkshire than other stocks

Berkshire Hathaway's Warren Buffett told CNBC's Becky Quick that it is difficult to buy back large numbers of his company's shares. "It's harder to buy back Berkshire Shares than say Bank of America buying back its stock ... they can really do it without moving the market." "Berkshire is held by people that really primarily keep it," he added.