Upstone is the leading manufacturer of aggregates, hot mix asphalt, and ready-mix concrete in northeastern New York with three large quarries, four hot mix asphalt plants, seven ready-mix locations, along with dozens of sand and gravel pits. Installs, troubleshoots, adjusts, replaces, repairs, and rewires electrical systems and components, such as ignitions, signals, lights, and electrical controls, including computer-controlled components.