Berkshire Hathaway (NYSE: BRK-A)(NYSE: BRK-B) chairman and CEO Warren Buffett is an unabashed fan of finance industry stocks. Exactly half of Berkshire’s top 10 holdings by market value are financial-service concerns or other companies that somehow fit into the sector. For many years, the company has owned especially massive stakes in both Wells Fargo (NYSE: WFC) and American Express.