One of the most exciting things to do as an investor is to look at what famed institutional investors are buying and selling. The Securities and Exchange Commission requires large money managers to file a form called a 13F, which breaks down the stocks that hedge funds and other sophisticated investors on Wall Street are trading.

Perhaps the most closely followed 13F comes from Warren Buffett's Berkshire Hathaway. Over the past several quarters, Berkshire's 13F filings contained an investment that was anonymous. In other words, investors were aware that Buffett was entering a new position but the specific company was a mystery.

Although seeking confidential treatment is not all that common, this isn't the first time Buffett has played coy. Nevertheless, the confidentiality surrounding Buffett's latest new position brought an additional layer of allure to Berkshire's quarterly filings.

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Source Fool.com