Great sluething, wise atomist!
I'd be willing to bet the smarter of the intellectually challenged shorts have been buying. Perhaps there are new shorters selling to these buyers? There usually appears a new wave of them after a stock runs up like this. They are of the 'What runs up quickly, must correct downward' ilk. I pleasantly watched 3 waves of them get burned on KOS after they settled a dispute with Barr, while Jaharis' wife had purchased a nasty amount of KOS stock at bargain prices and the shorts were caught with their pants down on a big run.
Another great day for the patient, long holders of SRDX. This run appears to have legs.
The orthopedics device market is much bigger than stents. Hopefully a major deal is in the works.