“Martin Shkreli may be the public face of drug-price gouging, [but] Valeant was the real pioneer. A 2015 analysis looked at drugs whose price had risen between three hundred per cent and twelve hundred per cent in the previous two years; of the nineteen whose prices had risen fastest, half belonged to Valeant.” However, those obscene price hikes weren’t what sunk the company’s stock by almost 90% (in fact, they probably had the opposite effect). The New Yorker’s James Surowiecki on The Roll-Up Racket. If your stock price drops ninety percent in four hours, call 911 (or your broker).