Gerdau S.A. is a Brazilian multinational steel manufacturing company. It is the largest producer of long steel in the Americas and one of the largest suppliers of special steel in the world. The company operates in 10 countries and has over 30,000 employees. Gerdau's products are used in a variety of industries, including construction, automotive, and energy. The company was founded in 1901 and is headquartered in Porto Alegre, Brazil.