ABM Industries
A U.S.-based provider of integrated facility management and facility services.
Last updated August 21, 2026
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Overview
ABM Industries is a publicly traded American provider of integrated facility management and outsourced facility services. The company serves commercial, institutional, industrial, transportation, healthcare, education, government, and other large-site customers. Its service portfolio includes janitorial and environmental services, facility engineering, electrical and lighting work, heating, ventilation and air-conditioning, mechanical maintenance, energy and electrification services, landscape and grounds care, parking, transportation, and related operational support. ABM may provide an individual service or combine several functions under an integrated facilities arrangement, allowing customers to outsource recurring building operations to one provider. The business began in San Francisco in 1909, when Morris Rosenberg operated a one-person window-washing service. It adopted the American Building Maintenance name in 1913 and expanded during the 1920s and 1930s through recurring cleaning contracts and regional growth. In 1921, it became the first janitorial contractor reported to have cleaned a major American college campus when it won a contract at Stanford University. The company later added janitorial supplies, electrical work, engineering, parking, mechanical services, and other building-support capabilities. During the Second World War, ABM cleaned Navy ships and installed wiring on Water Buffalo amphibious vehicles, illustrating its early move beyond conventional window cleaning. ABM became a public company in 1962 through the over-the-counter market, moved to the NYSE American in 1965, and began trading on the New York Stock Exchange in 1971 under the symbol ABM. From the late twentieth century onward, acquisitions helped it build a multi-service platform. Important transactions included businesses associated with parking, mechanical systems, elevators, lighting, engineering, janitorial services, healthcare parking, and outsourced facility operations. The 2007 purchase of OneSource Services, the 2010 acquisition of The Linc Group, the 2012 purchase of AirServ and HHA Services, the 2017 acquisition of GCA Services Group, and the 2021 acquisition of Able Services were among the most significant steps in this expansion. ABM has also reshaped its portfolio through divestitures. It sold Amtech Elevator in 2003, CommAir Mechanical in 2005, its security business in 2015, and its government-services business in 2017. These transactions reflected a continuing effort to concentrate resources on facility solutions and related outsourced operations while adjusting the mix of specialist businesses. The company’s customers include airports, commercial properties, universities, hospitals, manufacturing sites, retail and institutional facilities, and transportation environments. Its operating model is labor-intensive but increasingly incorporates engineering expertise, energy management, technology, electrification, and coordinated account management. ABM’s scale has grown through both organic operations and acquisitions, while its geographic footprint has included numerous U.S. locations and selected international markets, particularly the United Kingdom and Canada. ABM joined the Fortune 500 in 2016. It remains listed on the New York Stock Exchange under ABM; current financial scale and segment details should be checked against its latest regulatory filings and investor-relations materials.
History
ABM Industries began in 1909 in San Francisco, California, when Morris Rosenberg started a one-person window-washing business serving local shopkeepers. The company adopted the American Building Maintenance name in 1913. Its early growth came from recurring commercial cleaning contracts, and in 1921 it reportedly became the first American janitorial contractor to clean a major college campus after winning work at Stanford University. In 1927, ABM acquired Easterday Janitorial Supply Company, broadening its relationship with the cleaning-supply side of the industry. During the 1920s and 1930s, ABM expanded along the West Coast. After Rosenberg died in 1935, his elder son Theodore became president, while his younger son Sydney joined the business in 1937. That year, Theodore purchased an electrical company, helping move ABM toward technical building services. During World War II, the company cleaned Navy ships and installed wiring on Water Buffalo amphibious vehicles. By the end of the war, it had grown to 17 offices in the United States and Canada. ABM continued expanding after the war and entered public markets in 1962 through over-the-counter trading. It moved to the NYSE American in 1965 and made its debut on the New York Stock Exchange in 1971 under the ticker ABM. Acquisitions in the late 1960s added or supported businesses that became associated with parking, mechanical systems, elevator services, and lighting services. These moves established the basis for a multi-service facilities platform rather than a business focused only on cleaning. In the early 1990s, ABM established ABM Engineering. The engineering operation received ISO 9002 certification in 1999. By the end of that decade, the company employed more than 55,000 people and reported annual sales above $1.6 billion, according to the historical account cited by Wikipedia. These historical financial figures are not presented as current performance measures. Henrik Slipsager became president and chief executive officer in November 2000. The following period combined acquisitions with portfolio rationalization. ABM sold Amtech Elevator in 2003 and CommAir Mechanical in 2005, while acquiring Lakeside Building Maintenance in 2002, Security Services of America in 2004, and several janitorial businesses. In 2007, it acquired healthcare-parking assets from HealthCare Parking Systems of America and completed the acquisition of OneSource Services for $365 million in cash. OneSource expanded ABM’s reach in janitorial, landscaping, general repair, maintenance, and related outsourced facility services. The company acquired The Linc Group in 2010 for $300 million and added selected parking assets in the same period. In 2012, it bought AirServ and HHA Services, extending its exposure to aviation support and healthcare facility services. ABM’s history was also marked by the loss of 17 employees in the September 11 attacks at the World Trade Center in 2001; the company’s window-washing heritage became part of the public remembrance of those workers. Scott Salmirs became ABM’s chief executive in 2015, with Anthony Scaglione appointed chief financial officer that April. ABM sold its security business later in 2015 and acquired Westway Services Holdings, a U.K. technical-engineering company. It entered the Fortune 500 in 2016. In 2017, ABM sold its government-services business to Valiant Integrated Services and acquired GCA Services Group for $1.25 billion, its largest acquisition at that point. In 2021, ABM completed the acquisition of Able Services, a San Francisco-based, family-owned facility-services company. The transaction reinforced ABM’s integrated facilities strategy and added further capabilities and customer relationships. Today, ABM presents itself as a provider of facility solutions spanning cleaning, engineering, energy, technical maintenance, parking, transportation, grounds, and related services. Because its offerings, reporting segments, executive roster, and geographic operations can change, current details should be confirmed through the company’s filings and official website.
- 2021
Able Services acquisition completed
[1]ABM finalized its acquisition of Able Services, strengthening its integrated facility-services platform.
- 2017
GCA Services Group acquired
[1]ABM acquired GCA Services Group in a transaction valued at approximately $1.25 billion.
- 2016
Fortune 500 recognition
[1]ABM joined the Fortune 500 for the first time.
- 2015
Scott Salmirs becomes chief executive
[1]Scott Salmirs was appointed ABM’s seventh chief executive in its first 106 years.
- 2010
The Linc Group acquired
[1]The $300 million transaction expanded ABM’s engineering and technical-services capabilities.
- 2007
OneSource Services acquired
[1]ABM completed its $365 million cash acquisition of OneSource Services.
- 1990
ABM Engineering established
[1]The company established an engineering business as part of its expansion into technical facility services.
- 1971
New York Stock Exchange debut
[1]ABM began trading on the New York Stock Exchange under the symbol ABM.
- 1965
Listed on NYSE American
[1]The company moved from over-the-counter trading to the NYSE American.
- 1962
Public-market trading begins
[1]ABM became publicly traded through the over-the-counter market.
Products and positioning
A large-scale outsourced facilities and building-operations partner for commercial, institutional, industrial, healthcare, education, airport, and transportation customers.
Facility management
Integrated Facility Solutions
ABM combines multiple building-operations functions under coordinated service arrangements for commercial, institutional, industrial, healthcare, educational, and transportation customers. Depending on the site, an integrated program can bring together janitorial work, engineering, maintenance, energy management, grounds care, parking, and operational coordination. The offering is intended for customers seeking to outsource a substantial portion of recurring facility operations rather than manage each specialty through separate contractors.
Cleaning services
Janitorial and Environmental Services
Cleaning and environmental services remain central to ABM’s historical identity. The company provides recurring custodial and cleaning work across offices, airports, schools, healthcare sites, industrial properties, retail environments, and other large facilities. Services can include routine cleaning, sanitation, floor care, and related environmental upkeep. ABM’s janitorial operations developed from its original window-washing business and were expanded through regional contracts and acquisitions.
Engineering and maintenance
Engineering and Technical Services
This line supports the operation and maintenance of building systems and technical infrastructure. It may include facility engineering, electrical and lighting work, mechanical services, heating, ventilation and air-conditioning, energy-related services, equipment maintenance, and electrification projects. The company built these capabilities through internal development and acquisitions, including the formation of ABM Engineering and the purchase of The Linc Group and Westway Services Holdings.
Parking and transportation
Parking and Transportation Services
ABM operates and supports parking facilities for airports, healthcare institutions, commercial properties, and other high-traffic locations. Activities may include parking operations, customer-facing services, site management, and transportation coordination. ABM expanded this capability through acquisitions and selected parking-asset purchases, making parking a complementary service within its broader facilities portfolio.
Airport services
Aviation Services
ABM provides facility and operational services in airport and aviation environments. These activities can be integrated with cleaning, passenger-area support, parking, transportation, and technical maintenance. The acquisition of AirServ in 2012 increased ABM’s exposure to aviation-related outsourced services and complemented its existing work at complex transportation facilities.
Exterior facility services
Landscape and Grounds Services
Landscape and grounds services cover the upkeep of exterior areas associated with commercial, institutional, industrial, and other managed properties. They complement interior cleaning and engineering work in integrated contracts, giving customers one provider for both building interiors and surrounding grounds. ABM expanded its grounds and landscaping scope through organic operations and acquisitions such as OneSource Services.
Brand decisions
2021
Acquire Able ServicesM&ABackground
ABM continued to build an integrated facility-services business through the acquisition of a large privately held U.S. provider.
Action taken
ABM finalized the acquisition of Able Services.
Aftermath
The transaction strengthened ABM’s U.S. facility-management and technical-services capabilities.
2017
Acquire GCA Services GroupM&ABackground
ABM pursued a major expansion of its facility-services scale and customer coverage.
Action taken
The company purchased GCA Services Group for approximately $1.25 billion.
Aftermath
The deal became ABM’s largest acquisition at the time and materially expanded its outsourced facility-services platform.
Acquisition price. $1.25 billion (September 2017 transaction)
2015
Divest security operationsStrategyBackground
ABM adjusted its portfolio while concentrating on facility services and related operational capabilities.
Action taken
It sold its security business to a division of Universal Services of America.
Aftermath
Security services left ABM’s operating portfolio, allowing the company to focus more directly on facilities and technical services.
Divestiture proceeds. $131 million (October 2015)
2012
Expand aviation and healthcare facility servicesM&ABackground
ABM was expanding into specialized operating environments where customers outsourced complex facility and support functions.
Action taken
The company acquired AirServ and HHA Services.
Aftermath
The acquisitions increased ABM’s presence in aviation support and healthcare food and facility services.
2007
Acquire OneSource ServicesM&ABackground
ABM sought to broaden its outsourced facility-services platform beyond traditional janitorial work.
Action taken
It completed a cash acquisition of OneSource Services for approximately $365 million.
Aftermath
The transaction added janitorial, landscaping, repair, maintenance, and specialized facility-service capabilities serving a broad commercial and institutional customer base.
Acquisition price. $365 million (2007 transaction)
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