Short interest in iShares National Muni Bond ETF (ARCA:MUB) increased during the last reporting period, rising from 14.29M to 16.84M. This put -% of the company's publicly available shares short.

Based on the recent average volume of 20.32M 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.