Another statin, atorvastatin (Trade name: Lipitor, Pfizer) became the biggest selling drug of all time and simvastatin also became an all time best seller.
Figuring he'd spotted an institution working a big sell order with a clever computer program, Park sold the stock short every time the seller showed up.
Assuming the possibility that the short-seller's bearishness is unwarranted--which is a lot of the time--the seller, seeking to avoid losses on shares sold short, must re-enter the market in order to buy back the shares at a loss so that they can be returned.