EMCOR Group, Inc. engages in the provision of electrical and mechanical construction, and facilities services. The company is headquartered in Norwalk, Connecticut and currently employs 40,400 full-time employees. The company went IPO on 2000-11-16. The firm provides mechanical and electrical construction services, industrial and energy infrastructure and building services. Its services are provided to a range of commercial, technology, manufacturing, industrial, healthcare, utility, and institutional customers through approximately 100 operating subsidiaries. Such operating subsidiaries are organized into the various reportable segments, including United States electrical construction and facilities services, United States mechanical construction and facilities services, United States building services, United States industrial services, and United Kingdom building services. Its electrical and mechanical construction services primarily involve the design, integration, installation, start-up, operation and maintenance, and provision of services relating to roadway and transit lighting and signaling and fiber optic lines, and fire protection and suppression systems.