TheStreet. Warren Buffett is arguably the most successful investor of all time. He's amassed an amazingly massive net worth by buying and usually holding stocks for the long haul. Trained under legendary value fund investor Benjamin Graham,

Also notice that although these are six brand-new positions, they add up to about $4 billion, significantly less than the proceeds from the Apple, Bank of America, and T-Mobile sales, which is how Berkshire was still a net seller of stocks for the quarter.