A little over three weeks ago, arguably the most important data release of the entire quarter occurred on Wall Street -- and I'm not talking about the April inflation report or anything to do with earnings season.

Wednesday, May 15, marked the filing deadline for institutions with at least $100 million in assets under management to file Form 13F with the Securities and Exchange Commission. A 13F provides investors with an under-the-hood look at what Wall Street's smartest and most-successful money managers bought, sold, and held in the latest quarter.

Even though 13Fs are filed up to 45 days following the end to a quarter (and can therefore contain stale information), they're nevertheless helpful in identifying what stocks, industries, and innovative trends are piquing the interest of Wall Street's greatest investors.

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Source Fool.com