Oct 07, 2021 · Oct 07, 2021 · Country: Rapid City, 5201, US, 57702. Company: Colas. Subsidiary: Simon. Simon is a subsidiary of the Colas Group, a worldwide leader in infrastructure construction and maintenance. Simon specializes in aggregates, asphalt and readymix concrete production, asphalt paving, and concrete, bridge, highway, and utility construction.