Short interest in NPK International Inc (NYSE:NPKI) increased during the last reporting period, rising from 1.27M to 1.29M. This put 1.59% of the company's publicly available shares short.

Based on the recent average volume of 712.31K shares traded per day, it would take 1.81 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.