Warren Buffett is widely considered one of the most successful investors in history. And when he buys stocks for his Berkshire Hathway (NYSE: BRK.A) (NYSE: BRK.B) portfolio, it can be profitable to pay attention.

Never lose money. Rule Number 2: Never forget rule No. 1,” he wasn’t offering a cute soundbite — he was revealing the cornerstone of his investing philosophy. In a world increasingly dominated by speculative trends and short-term thinking,

Warren Buffett and his crew at Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) have one of the best investment track records of all time. Few investors have been able to match Buffett's success over Berkshire's long history.