For nearly six decades as CEO of conglomerate Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), Warren Buffett has been dazzling Wall Street with his investing prowess. Although Buffett is fallible just like the rest of us, he's overseen a greater than 4,200,000% aggregate return in his company's Class A shares (BRK.A) since taking over Berkshire Hathaway in the mid-1960s. Given the Oracle of Omaha's affinity for generating long-term profits, professional and everyday investors often track his buying and selling activity like hawks.