When investing great Warren Buffett speaks, Wall Street wisely listens. Since ascending to the CEO chair at Berkshire Hathaway ( BRK.A) ( BRK.B 0.71%) in the mid-1960s, he's overseen an aggregate return in his company's Class A shares (BRK.A) of more than 5,580,000%, as of the closing bell on Nov. 7.

The conglomerate’s cash pile tops $300 billion for the first time.

Investors this weekend shifted their focus to big moves disclosed by Berkshire Hathaway (NYSE:BRK.A)(NYSE:BRK.B). The conglomerate led by Warren Buffett cut its notable stake in iPhone-maker Apple (AAPL) by 25% - after slashing it by almost half in Q2 - while holdings in heavyweight lender Bank of America (BAC) were also reduced by more than 20%.