Have you ever wondered what the brightest minds on Wall Street were up to or thinking? Well, wonder no longer.

Every quarter, investment firms and hedge funds with more than $100 million in assets under management are required to file Form 13F with the Securities and Exchange Commission (SEC). This SEC filing effectively provides a snapshot of a firm's or fund's holdings at the end of the most recent quarter. Even though 13Fs have drawbacks -- they're providing a snapshot that's often six week old -- they still offer immense value by allowing professional and retail investors to see what trends and stocks have piqued the interest of the world's most successful investors.

During the fourth quarter, the smartest money managers couldn't stop buying the following five stocks.

Billionaire activist-investor David Tepper only holds 45 stocks in his Appaloosa Management hedge fund. But during the fourth quarter, e-commerce giant Amazon(NASDAQ:AMZN) was one of Tepper's biggest additions. The 56,200 shares purchased increased Appaloosa's stake by 39%, which made Amazon the second-largest holding in Tepper's fund.

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