Joel Greenblatt is one of the world’s most successful investors.

He wrote, The Little Black Book That Beats the Market. The U.S. Value 1000 Fund he started has returned 18.6% per year since its inception.

That’s why investors should sit up and take notice of what Greenblatt is up to right now.

He’s loaded up with $15 million worth of stock in a low-priced, forgotten about, tech company.

And he’s not the only one…

David Dreman just anted up to buy more shares last quarter.

So did hedge fund legend David Einhorn.

Why are all these savvy professionals so interested in this stock?

This video explains everything.