First Trust Exchange-Traded Fund VIII - First Trust Flexible Municipal High Income ETF is an exchange traded fund launched and managed by First Trust Advisors LP. The fund invests in fixed income markets of the United States. It primarily invests in municipal debt securities issued by or on behalf of states, territories or possessions of the U.S. and the District of Columbia and their political subdivisions, agencies, authorities and other instrumentalities that are exempt from regular federal income taxes. The fund invests in securities of any maturity. It seeks to benchmark the performance of its portfolio against the Bloomberg Municipal Bond Index, the Bloomberg Municipal Long Bond (22+) Index, and a Blended Benchmark comprising of 50% of the Bloomberg Municipal High Yield Bond Index and 50% of the Bloomberg Municipal Bond Index. First Trust Exchange-Traded Fund VIII - First Trust Flexible Municipal High Income ETF was formed on September 27, 2016 and is domiciled in the United States.