SPTS provides access to a market-like basket of short-term US Treasurys, tracking the same index that we chose as our benchmark for the segment. Securities in the index must be USD-denominated, and fixed-rate and non-convertible. Certain issues, such as state and local government bonds, as well as US Treasury TIPS and Separate trading of registered interest and principal securities (STRIPS), are excluded from index selection. The underlying index is weighted by market value and is updated each month. The fund competes directly with Schwabs SCHO and Vanguards VGSH, which track the same index. SPTS traded under the ticker SST until October 2017. Prior to April 30, 2018, the fund tracked the Bloomberg Barclays 1-5 Year US Treasury Index.