Short interest in SPDR Portfolio Mortgage Backed Bond ETF (ARCA:SPMB) decreased during the last reporting period, falling from 589.58K to 388.55K. This put -% of the company's publicly available shares short.

Short interest for SPDR Portfolio Mortgage Backed Bond ETF gives investors a sense of the degree to which investors are betting on the decline of SPDR Portfolio Mortgage Backed Bond ETF's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 1.55M 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.