First Trust Exchange-Traded Fund IV - First Trust Low Duration Opportunities ETF is an exchange traded fund launched and managed by First Trust Advisors LP. It invests in the fixed income markets of the United States. The fund invests in investment grade mortgage-related debt securities including residential mortgage-backed securities, commercial mortgage-backed securities, stripped mortgage-backed securities, and collateralized mortgage obligations which are issued or guaranteed by the government or its agencies or instrumentalities. The fund invents in securities with an average maturity of less than three years. It seeks to benchmark the performance of its portfolio against the ICE BofA 1-5 Year US Treasury & Agency Index and the Bloomberg US Aggregate Bond Index. First Trust Exchange-Traded Fund IV - First Trust Low Duration Opportunities ETF was formed on November 4, 2014 and is domiciled in the United States.