Once every quarter, institutional money managers with more than $100 million in assets under management are required to file Form 13F with the Securities and Exchange Commission. A 13F provides an under-the-hood look at what Wall Street's brightest investment minds have been buying and selling in the latest quarter. However, 13Fs aren't just limited to traditional fund managers.

Some of Wall Street's largest and most-influential companies also invest their capital in businesses they believe can change the world -- or at the very least that can make their company and shareholders richer. The nearly $379 billion portfolio Warren Buffett oversees at Berkshire Hathaway serves as a good example.

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Source Fool.com