Short interest in Invesco National AMT-Free Municipal Bond ETFo (ARCA:PZA) increased during the last reporting period, rising from 152.30K to 296.65K. This put -% of the company's publicly available shares short.

Based on the recent average volume of 3.31M shares traded per day, it would take 1 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.