Short interest in Amphastar Pharmaceuticals Inc (NASDAQ:AMPH) decreased during the last reporting period, falling from 3.90M to 3.59M. This put 17.02% of the company's publicly available shares short.

Based on the recent average volume of 411.56K shares traded per day, it would take 8.71 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.