The company was renamed Aberdeen Corporation Transport Department when it became solely a bus operator with trams ceasing on 3 May 1958.

In January 1989 the company was privatised under an employee stock ownership plan led by its general manager Moir Lockhead.

In April 1995 FirstBus was formed through the merger of the Badgerline and GRT Bus Groups, with fleets in England, Wales and Scotland.

When privatised, a scheme with a larger area of cream base colour, supplemented by a two-tone green stripe pattern was adopted.

[8] First Aberdeen were the world's first operator of double-decker hydrogen fuel cell buses, taking delivery of 15 Wright StreetDeck Hydroliners in January 2021.

[9] These were initially taken off the road in January 2022 due to technical faults and were temporarily replaced with Euro VI diesel buses loaned from First Glasgow.

It was built in 1862 and bought by Aberdeen Corporation Tramways[2] The site has also served as global headquarters of FirstGroup since its formation in 1995.

On 21 June 2007 First gained permission to redevelop the site into a new Aberdeen bus depot and global FirstGroup headquarters building.