With as impressive of an investing track record as Warren Buffett has achieved, you'd expect his Berkshire Hathaway portfolio would be loaded with great stocks. And you'd be right. The good news is that you don't need a huge amount of cash to buy many of those stocks.

Warren Buffett stock American Express is flashing a bullish signal after breaking out, with earnings due next week. American Express stock wavered in buy range on Thursday.Also, American Express on Thursday announced it would pay a roughly $230 million settlement following a Department of Justice criminal wire fraud investigation.

Warren Buffett is known for his investing success, generating market-beating returns over the long run. As chairman, he's helped Berkshire Hathaway deliver a compounded annual gain of more than 19% over 58 years -- that's as the S&P 500 posted a compounded increase of about 10% during that period.

Berkshire Hathaway ( BRK.A 1.42%) ( BRK.B 1.11%) owns shares of more than 40 different companies in its portfolio. To be perfectly honest, there's a solid investment case to be made for all of them. After all, Warren Buffett and his team tend to invest in industry leaders with excellent cash flow and durable competitive advantages.

In a famous Arthur Conan Doyle story, “The Adventure of Silver Blaze,” Sherlock Holmes draws the attention of Scotland Yard’s Inspector Gregory to the “curious incident of the dog in the night-time.” Gregory,

Arguably the world's greatest stock picker isn't picking many stocks these days. Warren Buffett has been a net seller of stocks for eight consecutive quarters. There's a reason Buffett isn't buying many stocks -- and it's the same reason he ranks among the greatest investors of all time.