The OTC-traded common shares of Fannie Mae are up over 750% over the past 12 months but have plummeted during the past several days of trading. Is this a pure speculation play, or is there actually opportunity for Foolish investors?

In this video, Motley Fool financial analysts Matt Koppenheffer and David Hanson answer with a resounding "No!" Matt and David remind investors what these shares are entitled to and why investing in them may cause investors to lose sleep at night.

David Hanson has no position in any stocks mentioned. Matt Koppenheffer has no position in any stocks mentioned. You can follow David and Matt on Twitter. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.