BBSB aims to provide exposure to the US Treasury market by tracking an index of short-term US treasury bonds, all selected and weighted using market value. It exclusively holds USD-denominated, fixed-rate securities with one to three years until maturity. The funds objective is to offer low-cost beta exposure while seeking current income. It will use a representative sampling method, where it will invest only in chosen securities to approximate the overall portfolio characteristics. Additionally, the index is rebalanced monthly. The fund launched as part of a suite alongside BBIB and BBLB providing intermediate-term and long-term exposures, respectively.