Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) owns shares of more than 40 different companies in its portfolio. After all, Warren Buffett and his team tend to invest in industry leaders with excellent cash flow and durable competitive advantages.

Investors often turn to Warren Buffett for advice for one good reason: He's proven his ability to navigate any investing waters -- from moments of euphoria to the doldrums -- and win over time. Buffett doesn't rush to buy the hottest stocks as markets soar and doesn't panic-sell during difficult periods.

Warren Buffett has created incredible wealth for shareholders of Berkshire Hathaway. It's been very inspiring to individual investors that he did it -- as he alluded to in his 1988 letter to shareholders -- by focusing on investing in quality companies and holding for the long term, without being fazed by occasional market volatility.