First Bus is part of the First Group.

FirstGroup plc is a British multi-national transport group, based in Aberdeen, Scotland. The company operates transport services in the United Kingdom, Ireland, Canada and the United States. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

FirstGroup originated from the deregulation of bus services in the United Kingdom in 1986, whereby private companies purchased nationalised and municipal bus operators. In September 1986 the Somerset based services of the Bristol Omnibus Company that were rebranded in 1985 as Badgerline were purchased in a management buyout. As Badgerline Group, it expanded through acquisition purchasing other formerly nationalised bus companies in England and Wales.

In January 1989, Grampian Regional Transport, the bus operator in Aberdeen owned by Grampian Regional Council, was privatized in a management buyout led by its then general manager Moir Lockhead. As GRT Bus Group, it expanded through acquisition purchasing six former nationalised bus companies in England and Scotland. In April 1995, FirstBus was formed through the merger of the Badgerline and GRT Bus Groups, with fleets in England, Wales and Scotland. The former King Street Barracks site in Aberdeen was selected as the headquarters. At the time of the merger, FirstBus had 5,600 buses, 4,000 of which came from Badgerline. Badgerline’s Trevor Smallwood became chairman of FirstBus, while GRT head Moir Lockhead became deputy chairman and chief executive.