Warren Buffett is a famous billionaire investor, and his trillion-dollar conglomerate, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), owns nearly 50 stocks in its portfolio. Several of these stocks are in the financial and energy sectors.

Warren Buffett has been on a selling spree and recently trimmed his two biggest holdings: Apple and Bank of America. Buffett caught many investors by surprise when he trimmed his Apple position,

Equal opportunity should begin at birth,’ wrote the Oracle of Omaha, as he chastised those with ‘extreme look-at-me styles of living.’ Warren Buffett has distributed another $1 billion of his wealth in what is fast becoming a Thanksgiving tradition for the world’s seventh-richest man.

Investors shouldn't unthinkingly follow Buffett, or any other billionaire money manager, into Amazon or any other stock. However, Amazon is a top stock with robust opportunities trading at an attractive valuation, and if you have $500 available today, Amazon is an excellent choice.

Despite being a net seller of stocks to the tune of $166 billion over the last eight quarters, there are two premier stocks the Oracle of Omaha can't stop buying.