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What: Shares of drug developer Amarin
So what: An FDA approval for a small developer like Amarin would normally be cause for investors to party like it's 1999. So why in the world is Amarin's stock falling today? It would appear that investors may be disappointed at the restrictions that the FDA put on Amarin's drug, Vascepa. The restrictions will limit the overall addressable market for the drug out of the gate, which is an outcome that would understandably damper investor enthusiasm.
Now what: It's not like investors who have been riding Amarin recently haven't been rewarded -- the stock has roughly doubled so far this year (even after today's drop). The task now is for investors to go back to their spreadsheets and figure out what the longer-term financial implications are for the narrower market for Vascepa and determine whether the dip in the stock today provides is a good time to load up or join the rush to the exits.
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Fool contributor Matt Koppenheffer does not have a financial interest in any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter @KoppTheFool or Facebook. The Fool's disclosure policy prefers dividends over a sharp stick in the eye.