| 41 Cromwell Road Management Company Limited | Bristol | 1992 |
| 41 Devonport Road Limited | London | 2008 |
| 41 Eaton Mews North Ltd | London | 2014 |
| 41 Engineering Ltd | Aberdeen | 2019 |
| 41 Howitt Road Management Limited | Camberley | 1999 |
| 41 Kong Investment Group Ltd | Sunderland | 2021 |
| 41 Lyncroft Gardens Management (NO2) Limited | London | 1989 |
| 41 the Avenue Management Company Limited | | 2000 |
| 41, Elliston Road, Redland Limited | Bristol | 1978 |
| 411 Communications Ltd | London | 2024 |
| 411 Edin Ltd. | Edinburgh | 2005 |
| 411 Marketing Limited | Elmstead Market | 2021 |
| 411V1111 Limited | London | 2025 |
| 414141-204060 Carcabs Ltd | London | 2000 |
| 416 Consultancy Limited | Warwick | 2024 |
| 418 Limited | Southampton | 2006 |
| 4182 Consulting Limited | Bridgend | 2025 |
| 419 Consulting Limited | Hadleigh, Benfleet | 2019 |
| 41A William Street (Management) Limited | Bristol | 1988 |
| 41ST Design Co Ltd | Bridgwater | 2024 |
| 42 (North) Limited | Kingsbridge | 2002 |
| 42 Abbey Foregate Limited | Shrewsbury | 1996 |
| 42 Albert Street (Newton Stewart) Limited | Newton Stewart | 2012 |
| 42 Bruton Limited | London | 2017 |
| 42 Commercial Ltd | Tunbridge Wells | 2023 |
| 42 Countess Road Management Company Limited | | 1992 |
| 42 Creative Ltd | Swadlincote | 2011 |
| 42 Creative Thinking Limited | Kendal | 2013 |
| 42 Degrees Consultancy Ltd | London | 2025 |
| 42 Degrees Consulting Limited | Lower Boddington | 2019 |
| 42 DHR Solutions Ltd | Rhyl | 2020 |
| 42 Digital Ltd | Omagh | 2017 |
| 42 Digital Media Ltd | Knaresborough | 2014 |
| 42 Dyke Road Drive Limited | Brighton | 2015 |
| 42 Eagle Street Limited | London | 1998 |
| 42 Edin Ltd. | Edinburgh | 2004 |
| 42 Engineering Ltd | Horley | 2021 |
| 42 Frobisher Road Limited | London | 2010 |
| 42 Genetics Ltd | Belfast | 2019 |
| 42 Gleneagle Road Limited | London | 1997 |
| 42 Group Holding Limited | Brighton | 2023 |
| 42 Mount Pleasant Road RTM Company Limited | London | 2017 |
| 42 PR Ltd | Norwich | 2008 |
| 42 Sinclair Road Limited | | 1993 |
| 42 Streathbourne Road Limited | | 2004 |
| 42 Technology Group Limited | Cambridge | 2019 |
| 42 Technology Limited | Cambridge | 2001 |
| 42 Think Ltd. | London | 1997 |
| 42 Tour Management Limited | Liverpool | 2015 |
| 420 Accountants Limited | Maidstone | 2024 |
| 420 Block Management Services Limited | Reigate | 2025 |
| 420 Media Ltd | Stowmarket | 2025 |
| 421 Footscray Road Limited | London | 2011 |
| 424 Management Ltd | Pinner | 2024 |
| 424 Sports Ltd | Padiham | 2024 |
| 4248E Limited | Lincoln | 2022 |
| 424JSTUDIO Ltd | London | 2025 |
| 425HIGH Ltd | Malvern | 2023 |
| 427 Group Ltd | Bishop'S Stortford | 2022 |
| 4291 Limited | Manchester | 2011 |
| 42IP Ltd | Haywards Heath | 2020 |
| 42NATE Ltd | London | 2024 |
| 42ND Design Co Ltd | Bridgwater | 2023 |
| 42POINTONE Limited | Loughborough | 2026 |
| 42STATS Limited | Canterbury | 2020 |
| 42TEST Limited | Hove | 2006 |
| 43 Blandford Street Holdings Limited | London | 2008 |
| 43 Consulting Ltd | Stafford | 2021 |
| 43 Coolhurst Road Limited | London | 2013 |
| 43 Elephants Limited | London | 2026 |
| 43 Lurline Gardens Residents Association Limited | London | 2001 |
| 43 Oak Consultancy Services Limited | Warrington | 2012 |
| 43 Percent Investments Ltd | Ruislip | 2022 |
| 43 Powderham Crescent (Exeter) Limited | Plymouth | 1988 |
| 43 Sandbed Road Management Limited | Bristol | 2008 |
| 43 Ways Advisory Ltd | Welling | 2020 |
| 4307 Roscoff Limited | London | 2010 |
| 432 Films Ltd | Pontefract | 2023 |
| 435 Limited | Stockbridge | 2009 |
| 436 Taxis Ltd. | Glasgow | 2011 |
| 4363 Enterprises Ltd | Oswestery | 2024 |
| 438 Digital Ltd | Loughton, Essex | 2014 |
| 438 Marketing Limited | Knutsford | 2008 |
| 43MEADOWS Limited | Enniskillen | 2026 |
| 43SEVEN Limited | Brighton | 2026 |
| 44 Aberdeen Road Freehold Company Limited | London | 2009 |
| 44 Aberdeen Road RTM Company Limited | London | 2008 |
| 44 Cats Ltd | Leicester | 2016 |
| 44 Communications (UK) Limited | Daventry | 2007 |
| 44 Design Limited | Milton Keynes | 2013 |
| 44 Energy Ltd | London | 2023 |
| 44 Engage Limited | Daventry | 2021 |
| 44 Engineering Limited | Aylesbury | 2020 |
| 44 Ferncroft Avenue Limited | London | 1999 |
| 44 Fortess Road Limited | Greater London | 2001 |
| 44 Foxes Ltd | Sandbach | 2025 |
| 44 Goldhurst Terrace Limited | | 2001 |
| 44 Grafton Square (Freehold) Limited | London | 2005 |
| 44 Gunter Grove Residents Company Limited | London | 2002 |
| 44 Interiors Ltd | London | 2025 |