EMCOR Group, Inc., is an engineering, construction, and property management company headquartered in Norwalk, Connecticut. Major clients, mostly of an industrial and/or commercial nature, include data centers, oil refineries; semiconductor, biotech, life sciences, and pharmaceutical facilities; and several facilities used by legislative, executive, and judicial branch entities of the United States Government both at federal buildings and laboratories around the country as well as agency headquarters in the Washington, DC area. It provides mechanical and electrical construction, engineering, industrial infrastructure, energy infrastructure, facilities management, and building services to private sector and public sector clients in the United States. It has over 100 operating subsidiaries and approximately 180 locations. The company is ranked 300th on the Fortune 500. In 2025, the company was ranked 2nd by Engineering News-Record on its list of the top 600 specialty contractors by revenue. Wikipedia