Are you a successful investor who's already managing a portfolio worth billions for yourself and others? If not, then there's probably a lot you can learn by following the handful of folks who can say they do.

Luckily for everyday investors like us, keeping tabs on billionaire investors is a lot easier than you might think. The U.S. Securities and Exchange Commission requires institutional investors to report their trading activity every three months on form 13-F, and the latest round of disclosures came with some eye-openers.

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Source Fool.com