ABM Industries Incorporated, which operates through its subsidiaries (collectively referred to as "ABM," "we," "us," "our," or the "Company"), is a leading provider of integrated facility solutions with a mission to make a difference, every person, every day. Our history dates back to 1909, when American Building Maintenance Company began as a window washing company in San Francisco with one employee. In 1985, we were incorporated in Delaware under the name American Building Maintenance Industries, Inc., as the successor to the business originally founded in 1909. In 1994, we changed our name to ABM Industries Incorporated. Over the past twelve years, we have grown into a multi-segment facility solutions company, primarily through strategic acquisitions and new service offerings, increasing our revenue from $3 billion to more than $6 billion.
The acquisition of OneSource in 2007 bolstered ABM as a leader in the janitorial market, while the Linc Group acquisition in 2010 established ABM as a "facility solutions" company with new service offerings, including lighting, mechanical, and electrical "technical solutions." With demand increasing for industry-specific service providers, in 2012 we purchased Air Serv and established our first industry group, "aviation." In recent years, we have strategically acquired companies in the United Kingdom, particularly with the GBM and Westway acquisitions, which expanded our janitorial and technical solutions businesses overseas. In 2017, we acquired GCA Services Group ("GCA"), a provider of integrated facility services to educational institutions and commercial facilities, for approximately $1.3 billion, the largest acquisition in ABM history. As a result of this acquisition, we are now a leading facility solutions provider in the education market. In recent years, we also evaluated all of our service offerings and sold our Security and Government Services businesses, which did not align with our long-term focus on industry groups.
Additionally, in 2015 we began a comprehensive transformational initiative ("2020 Vision") to drive long-term, profitable growth through an industry-based go-to-market approach. As part of this initiative, we centralized key functional areas, strengthened our sales capabilities, and initiated investments in service delivery tools and processes to help support standard operating practices that we believe are foundational to our long-term success.