There are some attractive stocks in Berkshire Hathaway's portfolio, especially in the financial sector.Berkshire Hathaway (BRK.A -0.59%) (BRK.B -0.48%) is well known for its massive stock portfolio, which has dozens of common stock positions, many of which were hand-selected by legendary investor Warren Buffett himself.To be sure, there's a solid investment case to be made for virtually all of them. Buffett tends to invest in stocks that have durable competitive advantage, attractive valuations, and other c ...