Between earnings season and an endless parade of economic data, there's a good chance you missed what just might be the most important data release of the quarter. Feb. 14 marked more than just Valentine's Day. It was also the Form 13F filing deadline for institutional investors and ultra-wealthy individuals with $100 million or more in assets under management.

A 13F allows investors a detailed look at what the smartest investors on Wall Street were buying, selling, and holding in the most recent quarter. Despite having their flaws -- e.g., 13Fs provide a portfolio snapshot that can be more than six weeks old -- 13Fs are valuable in the sense that they can clue investors into the stocks, trends, sectors, and industries garnering the attention of Wall Street's most-successful investors.

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Source Fool.com