First Trust ISE Global Copper Index Fund (CU) is an exchange-traded fund that seeks investment results corresponding generally to the price and yield performance, before fees and expenses, of the ISE Global Copper Index. The fund provides indirect exposure to copper through investments in equity securities of companies involved in copper mining and production worldwide; it employs a modified linear weighted methodology adjusted by revenue exposure to copper production, grouping component stocks into linearly weighted quartiles that are equally weighted within each quartile. CU primarily targets investors seeking sector-specific exposure to the global copper industry, with holdings spanning developed and emerging markets; the fund was launched in March 2010 and is sponsored by First Trust Advisors L.P., headquartered in Wheaton, Illinois. In a significant strategic shift, the fund changed its underlying index from the ISE Global Copper Index to the Indxx Global Natural Resources Income Index on December 18, 2015, and was renamed First Trust Indxx Global Natural Resources Income ETF (FTRI), broadening its focus to dividend-paying companies in energy, materials, agriculture, water, and timber sectors; this transition altered historical performance comparability for prior periods. No major acquisitions, partnerships, funding rounds, new product launches, or operational changes specific to CU have been reported in the last 1-2 years, though the issuer First Trust Advisors L.P. continues to manage collective assets exceeding $300 billion across its ETF lineup as of late 2025. The fund trades on the Nasdaq Global Market.