Warren Buffett expands investments in oil

These are the four new bets from the star investor

In the fight against cancer

In the fight against cancer

Pharmaceutical industry is realigning itself

Pharmaceutical industry is realigning itself

$ 900 million deal with pharmaceutical company BMS

Warren Buffett is now betting on these two stocks

Buffett is reducing stakes in Visa and Mastercard

Buffett is reducing stakes in Visa and Mastercard