A heavyweight in the heavy construction industry, Peter Kiewit Sons' represents one of North America's largest construction and engineering firms. It builds everything from roads and dams to high-rise office towers and power plants. Focusing on projects located throughout the US, Canada, and Australia, the contractor makes more than half of its revenue from oil and gas, electrical, power, and waterworks projects, while another 25% comes from transportation projects such as bridges, rail lines, airport runways, and mass transit systems. Affiliate Kiewit Mining owns coal mines in Texas, Montana, and Wyoming. Founded in 1884, Peter Kiewit Sons is owned by employees and Kiewit family members.