Short interest in UltraPro MidCap400 (ARCA:UMDD) increased during the last reporting period, rising from 7.74K to 37.29K. This put -% of the company's publicly available shares short.

Short interest for UltraPro MidCap400 gives investors a sense of the degree to which investors are betting on the decline of UltraPro MidCap400's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 22.90K shares traded per day, it would take 1.63 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.