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Cornerstone Building Brands, Inc., together with its subsidiaries, designs, engineers, manufactures, markets, and installs external building products for the commercial, residential, and repair and remodel markets in the United States, Canada, Mexico, and internationally. The company operates through three segments: Windows, Siding, and Commercial. Its Windows segment provides vinyl, aluminum, wood, and aluminum clad-wood windows and patio doors; and steel, wood, and fiberglass entry doors under the Ply Gem, Simonton, Atrium, American Craftsman, Silver Line, Great Lakes Window, and North Star brands. The company's Siding segment offers vinyl siding and skirting, composite siding, steel siding, vinyl and aluminum soffit, aluminum trim coil, aluminum gutter coil, fabricated aluminum gutter protection, PVC trim and moldings, and window and door trim products, as well as injection molded accents, such as shakes, shingles, shutters and vents, vinyl fencing and railing, and stone veneer. Its Commercial segment designs, engineers, manufactures, and distributes a range of metal products, such as metal building systems, metal roofing and wall systems, and coil coatings. The company was formerly known as NCI Building Systems, Inc. and changed its name to Cornerstone Building Brands, Inc. in May 2019. Cornerstone Building Brands, Inc. is headquartered in Cary, North Carolina.

Petróleo Brasileiro S.A. - Petrobras explores, produces, and sells oil and gas in Brazil and internationally. The company operates through Exploration and Production; Refining, Transportation and Marketing; and Gas and Power. It also engages in prospecting, drilling, refining, processing, trading, and transporting crude oil from producing onshore and offshore oil fields, and shale or other rocks, as well as oil products, natural gas, and other liquid hydrocarbons. The Exploration and Production segment explores, develops, and produces crude oil, natural gas liquids, and natural gas primarily for supplies to the domestic refineries. The Refining, Transportation and Marketing segment engages in the refining, logistics, transport, marketing, and trading of crude oil and oil products; exportation of ethanol; and extraction and processing of shale, as well as holding interests in petrochemical companies. The Gas and Power segment is involved in the logistic and trading of natural gas and electricity; transportation and trading of LNG; generation of electricity through thermoelectric power plants; holding interests in transportation and distribution of natural gas; and fertilizer production and natural gas processing business. In addition, the company produces biodiesel and its co-products, and ethanol; and distributes oil products. Further, it engages in research, development, production, transport, distribution, and trading of energy. Petróleo Brasileiro S.A. - Petrobras was incorporated in 1953 and is headquartered in Rio de Janeiro, Brazil.

Pershing Gold Corporation explores for, develops, and mines gold and precious metals in Nevada. It focuses on the exploration of the Relief Canyon properties covering an area of approximately 29,000 acres located in Pershing County in northwestern Nevada. The Relief Canyon properties include approximately 1,056 owned unpatented mining claims, 120 owned millsite claims, 143 leased unpatented mining claims, and 4,127 acres of leased and 3,739 acres of subleased private lands. The company was formerly known as Sagebrush Gold Ltd. and changed its name to Pershing Gold Corporation in February 2012. Pershing Gold Corporation is based in Lakewood, Colorado.

QMX Gold Corporation, a junior exploration company, engages in the acquisition, exploration, and development of mineral properties in Canada. It primarily explores for gold and base metal deposits. The company holds a portfolio of properties covering approximately 200 square kilometers of the Val d'Or Mining Camp in the Abitibi district of Québec. The company was formerly known as Alexis Minerals Corporation and changed its name to QMX Gold Corporation in June 2012. QMX Gold Corporation was incorporated in 1988 and is headquartered in Toronto, Canada. As of April 7, 2021, QMX Gold Corporation operates as a subsidiary of Eldorado Gold Corporation.

Xtra-Gold Resources Corp. engages in the exploration and development of gold properties in West Africa. Its flagship property is the Kibi Gold project located in the Republic of Ghana, West Africa. The company was formerly known as RetinaPharma International, Inc. and changed its name to Xtra-Gold Resources Corp. in December 2003. Xtra-Gold Resources Corp. was incorporated in 1998 and is based in Nassau, Bahamas. Xtra-Gold Resources Corp. is a subsidiary of Xtra-Gold Mining Limited.