PBUS is Invesco's entry for traditional market-cap-based exposure to US large- and mid-cap stocks. It aims to primarily invest at least 90% of its total assets in the component securities of the underlying index. The index is reviewed quarterly and rebalanced semi-annually. Its methodology also puts strong emphasis on index liquidity, investability and replicability. Prior to August 28, 2023, the fund traded under the name Invesco Pure Beta MSCI USA ETF.