Invesco S&P 500 Quality ETF seeks to track the investment results (before fees and expenses) of the S&P 500 Quality Index. The fund generally will invest at least 90% of its total assets in the securities that comprise the underlying index. In selecting constituent securities for the underlying index, the index provider calculates the quality score of each security in the S&P 500 Index, then selects the 100 stocks with the highest quality score for inclusion in the underlying index.