Invesco Taxable Municipal Bond ETF (BAB) is an exchange-traded fund in the Muni National Long category. It has $1.04B in assets, an expense ratio of 0.28% and a 4.10% dividend yield. The fund generally will invest at least 80% of its total assets in securities that comprise the index. The underlying index is designed to measure the performance of U.S. dollar-denominated taxable municipal debt publicly issued by U.S. states and territories, and their political subdivisions, in the U.S. domestic market.