SPBO holds a broad portfolio of industrial, financial, and utilities investment-grade corporate bonds denominated in USD. The fund ranks issuers using financial statement ratios and weights them accordingly. It weights specific issues by their market values within each issuer bucket. The fund uses a sampling method in tracking its index, which means it will invest in a sample of securities that collectively have an investment profile similar to that of the underlying index. The index is rebalanced monthly. Prior to September 23, 2019, the fund traded under the ticker CBND.