Just in case you missed it, Wednesday, Feb. 14, was arguably the most important day of the first quarter for investors. It marked the deadline for institutional investors with at least $100 million in assets under management to file Form 13F with the Securities and Exchange Commission.

In simple terms, a 13F allows investors to see what Wall Street's smartest and most-successful money managers purchased and sold in the most recent quarter. In this instance, I'm talking about buying and selling activity that would have occurred during the December-ended quarter.

While there are dozens of top-tier asset managers, none draw interest on Wall Street quite like Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett.

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Source Fool.com