Short Interest in SPDR Portfolio Mortgage Backed Bond ETF (NYSEARCA:SPMB) Expands By 261.2%

Posted by Joseph Casey on Aug 14th, 2026

SPDR Portfolio Mortgage Backed Bond ETF (NYSEARCA:SPMB – Get Free Report) was the target of a large increase in short interest during the month of July. As of July 31st, there was short interest totaling 895,869 shares, an increase of 261.2% from the July 15th total of 248,013 shares. Based on an average daily trading volume, of 903,169 shares, the days-to-cover ratio is currently 1.0 days. Currently, 0.3% of the shares of the company are short sold.

Institutional Inflows and Outflows

Hedge funds and other institutional investors have recently added to or reduced their stakes in the stock. Financial Engines Advisors L.L.C. boosted its holdings in SPDR Portfolio Mortgage Backed Bond ETF by 1.5% in the fourth quarter. Financial Engines Advisors L.L.C. now owns 188,762,736 shares of the company’s stock worth $4,231,117,000 after purchasing an additional 2,759,654 shares during the last quarter. State Street Corp lifted its holdings in shares of SPDR Portfolio Mortgage Backed Bond ETF by 69.8% during the 4th quarter. State Street Corp now owns 5,020,182 shares of the company’s stock valued at $112,527,000 after buying an additional 2,064,451 shares during the period. LPL Financial LLC boosted its stake in shares of SPDR Portfolio Mortgage Backed Bond ETF by 10.8% in the 4th quarter. LPL Financial LLC now owns 20,238,970 shares of the company’s stock worth $453,656,000 after buying an additional 1,974,582 shares during the last quarter. Financial Plan Inc. bought a new stake in shares of SPDR Portfolio Mortgage Backed Bond ETF in the fourth quarter worth $23,264,000. Finally, 93 Financial Group LLC bought a new stake in shares of SPDR Portfolio Mortgage Backed Bond ETF in the fourth quarter worth $16,956,000.

SPDR Portfolio Mortgage Backed Bond ETF Price Performance

SPMB traded down $0.07 during midday trading on Friday, hitting $22.00. 1,359,536 shares of the company traded hands, compared to its average volume of 1,031,967. The company’s 50-day moving average is $22.13 and its 200 day moving average is $22.32. SPDR Portfolio Mortgage Backed Bond ETF has a 52 week low of $21.88 and a 52 week high of $22.87.

About SPDR Portfolio Mortgage Backed Bond ETF

(Get Free Report)

The SPDR Portfolio Mortgage Backed Bond ETF (SPMB) is an exchange-traded fund that is based on the Bloomberg U.S. MBS index. The fund tracks an index of US agency mortgage pass-through debt. SPMB was launched on Jan 15, 2009 and is managed by State Street.