| London General Transport Services | Sutton Garage, Newcastle upon Tyne | 5 | 5 |
| Network Cars Tottenham | London | 287 | 182 |
| Sams Cars | London | 124 | 62 |
| Airport Transfer Cars | Enfield | 120 | 158 |
| Abellio London | London | 7 | 2 |
| London United Busways | Twickenham, London | 6 | 7 |
| Kier Highways | Bedfordshire, Manchester, Sandy | 5 | 11 |
| Abellio West London | London, Twickenham | 4 | 5 |
| Metroline Travel | London, Westminster | 3 | 14 |
| Arriva London South | Haringey, London, Sunderland | 3 | 5 |
| Blue Triangle Buses | Newcastle upon Tyne, London | 3 | 3 |
| Miniways Car Service | London | 72 | 66 |
| Emess Car Service | London | 28 | 28 |
| B & L Coaches | Goffs Oak | 24 | 39 |
| Mount Cars | London | 16 | 48 |
| LCT & Daughters | Leyton | 12 | 38 |
| GLH | London | 10 | 11 |
| Cavendish Cars | London | 8 | 129 |
| Arriva London North | Sunderland, London | 6 | 6 |
| Cascade Cars | London | 5 | 126 |
| East London Bus & Coach | Stockport | 4 | 7 |
| Sullivan Buses | Potters Bar, South Mimms | 4 | 4 |
| FM Conway | Kent, Sevenoaks | 3 | 9 |
| Grundon Waste Management | Wallingford, Oxfordshire | 3 | 3 |
| London Central Bus | Newcastle upon Tyne | 3 | 7 |
| Harris Installation Services | London, Greenwich | 3 | 3 |
| Ringway Infrastructure Services | West Sussex, Horsham | 3 | 3 |
| Biffa Waste Services | Buckinghamshire, High Wycombe | 2 | 36 |
| Bywaters Leyton | London | 2 | 2 |
| Rocket Science | City of London, Edinburgh | 2 | 2 |
| British Steel | Scunthorpe | 2 | 2 |
| Lucketts of Watford | Watford | 11 | 11 |
| Samafal Families Association | London | 6 | 3 |
| Blue Triangle | London | 5 | 5 |
| Quick Cars | Enfield | 5 | 5 |
| London Sovereign | London | 4 | 4 |
| Reed Specialist Recruitment | London | 3 | 33 |
| Tarmac Trading | Birmingham | 3 | 42 |
| Olympic South | London | 3 | 17 |
| Edes | Epsom | 3 | 2 |
| Universal Commercial Relocation | Ampthill | 3 | 3 |
| VCCP Group | London | 3 | 3 |
| WJB Services | West Horndon | 3 | 3 |
| Capita Business Services | London | 2 | 121 |
| HCT Group | London | 2 | 5 |
| Metrobus | Newcastle upon Tyne | 2 | 7 |
| Peoplecert | Nicosia | 2 | 2 |
| Gleam Service Centre | London | 2 | 11 |
| South East London & Kent Bus | Stockport | 2 | 8 |
| Abelio London | London | 2 | 2 |
| London Central | London | 2 | 2 |
| London Marathon Events | London | 2 | 2 |
| Stagecoach East London | London | 2 | 2 |
| Tower Transit | London | 2 | 2 |
| Trackwork | Doncaster | 2 | 2 |
| Havas People | Maidstone | 1 | 5 |
| Buckingham Group Contracting | Stowe | 1 | 5 |
| Tower Transit Operations | London | 1 | 4 |
| Gaist Solutions | Skipton | 1 | 2 |
| Waltham Forest Community Transport | London | 1 | 3 |
| ISG Fit Out | London | 1 | 2 |
| Bai Communications | London | 1 | 1 |
| Charles Novacroft Direct | Northampton | 1 | 1 |
| Construcciones Y Auxiliar de Ferrocarriles | Beasain | 1 | 1 |
| County Building Services | New Romney | 1 | 1 |
| Dac | Sabden | 1 | 1 |
| Emtransit | London | 1 | 1 |
| Interoute Networks | Nottingham | 1 | 1 |
| Journeycall | Arbroath | 1 | 1 |
| Kelly Rail | Wembley | 1 | 1 |
| Leah Minicab Service | London | 1 | 1 |
| Lime Technology | Birmingham | 1 | 1 |
| London Mutual Credit Union | Heaton Road Peckham London | 1 | 1 |
| London United | London | 1 | 1 |
| Metroline Travel Limite | London | 1 | 1 |
| PCG Associates | London | 1 | 1 |
| Reed Specialist Recrutment | London | 1 | 1 |
| Schunk Carbon Technology | Pudsey | 1 | 1 |
| Stagecoach Selkent | London | 1 | 1 |
| Tier Operations | London | 1 | 1 |
| Track Protection & Signalling | Hornchurch | 1 | 1 |
| Transave | Sheffield | 1 | 1 |
| Triangle London Developments | London | 1 | 1 |