ABM Industries Inc is a U.S.-based company that provides facility solutions through five segments. The janitorial segment provides cleaning services for various categories of facilities and buildings such as airports, office buildings, and stadiums. The facility services segment provides onsite mechanical engineering and technical services. The parking segment provides parking and transportation services. The building and energy solutions segment provides custom energy solutions, electrical services, HVAC, and others. The other segment provides facility solutions to aviation service companies. The janitorial segment is the largest segment, representing around half of total revenue. The company generates almost all of its revenue from the U.S. domestic market.