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The ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the Bloomberg U.S. Aggregate Index. The Index provides a measure of the performance of the U.S. dollar denominated investment grade bond market, which includes investment grade government bonds, investment grade corporate bonds, mortgage pass through securities, commercial mortgage backed securities and asset backed securities that are publicly for sale in the United States. The securities in the U.S. Aggregate Index must have at least 1 year remaining to maturity and must have $250 million or more of outstanding face value. Asset backed securities must have a minimum deal size of $500 million and a minimum tranche size of $25 million. For commercial mortgage backed securities, the original aggregate transaction must have a minimum deal size of $500 million, and a minimum tranche size of $25 million; the aggregate outstanding transaction sizes must be at least $300 million to remain in the index. In addition, the securities must be U.S. dollar denominated, fixed rate, non convertible, and taxable. The U.S. Aggregate Index is market capitalization weighted and the securities in the Index are updated on the last business day of each month.
State Street SPDR Portfolio Aggregate Bond ETF trades on the ARCA stock market under the symbol SPAB.
As of February 18, 2026, SPAB stock price declined to $26.01 with 2,382,589 million shares trading.
SPAB has a beta of -0.07, meaning it tends to be less sensitive to market movements. SPAB has a correlation of 0.08 to the broad based SPY ETF.
SPAB has a market cap of $9.22 billion. This is considered a Mid Cap stock.
In the last 3 years, SPAB traded as high as $26.35 and as low as $23.68.
SPAB has underperformed the market in the last year with a return of +7.2%, while the SPY ETF gained +13.8%. In the last 3 month period, SPAB fell short of the market, returning +1.8%, while SPY returned +3.4%. However, in the most recent 2 weeks SPAB has outperformed the stock market by returning +1.2%, while SPY returned -0.5%.
SPAB support price is $25.99 and resistance is $26.11 (based on 1 day standard deviation move). This means that using the most recent 20 day stock volatility and applying a one standard deviation move around the stock's closing price, stastically there is a 67% probability that SPAB shares will trade within this expected range on the day.
