The Fund seeks to track the investment results of the MSCI ACWI IMI Sustainable Water Transition Extended Capped Index (the Underlying Index), which has been developed by MSCI, Inc. (the Index Provider or MSCI). The Underlying Index is composed of U.S. and non-U.S. equity securities selected from the MSCI ACWI Investable Market Index (IMI) (the Parent Index). The Underlying Index is composed of two sets of constituents: 1) companies that provide, or have high exposure to, water-focused products or services and derive at least 10% of their revenues from sustainable water (the water supply universe), or 2) companies that demonstrate relatively efficient water management (the water usage universe), each as determined by MSCI and described below. MSCI defines sustainable water as products and services that address water scarcity or water quality issues, including specialized wastewater treatment chemicals, smart metering devices, drought-resistant seeds, wastewater filters, desalination equipment and services, maintenance of water distribution infrastructure, and construction of wastewater plants and stormwater systems. To assess water management efficiency, MSCI calculates a water stress management score using metrics related to a company's water usage governance, strategy, targets and performance as well as water conflicts controversies.