An insider named Robert Hawk sold some stock on Feb. 17th. However, if you look under Insider Transactions in Yahoo Finance, you will see that Robert Hawk has been selling similar amounts on a periodic basis going all the way back to when Tandem had their IPO in 2007. Therefore, this is nothing new, nothing to be concerned about, and very routine for this particular insider. I have been adding to my position all morning. Pull backs in this stock are very rare and I consider them a gift when they happen. You'll notice the shorts have already begun to cover and I predict TNDM will close green today.