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Canasil Resources Inc. engages in the exploration and development of mineral properties. The company explores for silver, gold, copper, zinc, and lead deposits. It holds 100% interests in the Salamandra zinc-silver project, the La Esperanza silver-gold-zinc-lead project, the Carina silver project, the Colibri silver-zinc-lead-copper project, the Vizcaino silver-gold project, and the Nora silver-gold-copper project located in Durango and Zacatecas States, Mexico. The company also has 100% interests in the Brenda gold-copper property, the Vega gold-copper property, the Granite gold property, and the LIL silver property situated in British Columbia, Canada. Canasil Resources Inc. was incorporated in 1984 and is headquartered in Vancouver, Canada.

Graphite One Inc. operates as mineral exploration company in the United States. It holds interest in the Graphite Creek property that consists of 176 mining claims covering an area of 9,600 hectares located on the Seward Peninsula, Alaska. The company was formerly known as Graphite One Resources Inc. and changed its name to Graphite One Inc. in February 2019. Graphite One Inc. was incorporated in 2006 and is headquartered in Vancouver, Canada.

ION Geophysical Corporation provides data-driven decision-making to offshore energy, and ports, and defense industries worldwide. The company operates through two segments, E&P Technology & Services and Operations Optimization. The E&P Technology & Services segment creates digital data assets and delivers services to help E&P companies improve decision-making and reduce risk. This segment includes two synergistic groups, imaging and reservoir services, and ventures. The company's Imaging and Reservoir Services group provides data processing, imaging, and reservoir services that improve image quality and subsurface insights, helping E&P companies reduce exploration and production risk, evaluate and develop reservoirs, and increase production. Its Imaging and Reservoir Services group develops and applies proprietary processing algorithms through its imaging engine to data owned or licensed by its customers to translate raw data into subsurface images. The Operations Optimization segment develops mission-critical subscription offerings and provides engineering services that enable operational control and optimization offshore. This segment includes the company's Optimization Software & Services and Devices offerings. The company's Optimization Software & Services group provides survey design, command, and control software systems and related services for marine towed streamer and seabed operations. Its Devices offerings group develops intelligent equipment controlled by its software to optimize operations. The company sells its services and products through a direct sales force consisting of employees and international third-party sales representatives. ION Geophysical Corporation was formerly known as Input/Output, Inc. and changed its name to ION Geophysical Corporation in 2007. The company was founded in 1968 and is headquartered in Houston, Texas. On April 12, 2022, ION Geophysical Corporation along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the U.S. Bankruptcy Court for the Southern District of Texas.

Norvista Capital Corporation operates as a resource investment company and merchant bank in the United States and Canada. It invests in a portfolio of companies that are involved in the exploration of base and precious metals, such as copper, zinc, silver, gold, and lead, as well as oil and gas located in Chile, Manitoba, Yukon, Mexico, and Nevada; and oil and gas in Israel, the United States, Brazil, and Canada. The company was founded in 2014 and is headquartered in Toronto, Canada.

ProShares UltraShort Basic Materials (the Fund) seeks daily investment results that correspond to twice the inverse daily performance of the Dow Jones U.S. Basic Materials Index (the Index). The Index measures the performance of the basic materials industry of the United States equity market. Component companies are involved in the production of aluminum, steel, non-ferrous metals, commodity chemicals, specialty chemicals, forest products, paper products, as well as the mining of precious metals and coal. The Fund takes positions in securities and/or financial instruments that, in combination, should have similar daily return characteristics as -200% of the daily return of the Index. The Index is a price return index. The Fund's investment advisor is ProShare Advisors LLC.