| 4 Sight Systems Limited | Buckingham | 2003 |
| 4 Site Cctv Ltd | Nuneaton | 2020 |
| 4 Site Documents Ltd | Hemel Hempstead | 2011 |
| 4 Site Security Services Limited | Leeds | 2002 |
| 4 Site Security Solutions Ltd | Wellington | 2024 |
| 4 Site Security Systems Ltd | Leeds | 2018 |
| 4 Stages Limited | London | 2014 |
| 4 Stars PCO Ltd | Ilford | 2025 |
| 4 Stone Buildings Limited | London | 2024 |
| 4 Sure Security Ltd | Croydon | 2018 |
| 4 Tunes Music Publishing Limited | London | 2008 |
| 4 U 2 Ltd | Glasgow | 2016 |
| 4 U Clean Ltd | Belfast | 2024 |
| 4 U Cleaning Limited | Edgware | 2024 |
| 4 U DIY Ltd | London | 2020 |
| 4 Utilities Limited | Rotherham | 2009 |
| 4 Wall Properties Ltd | Barnet | 2007 |
| 4 Walls Management Limited | London | 2014 |
| 4 Way Developments Holdings Limited | Bicester | 2021 |
| 4 Way Electrical EOT Limited | King'S Lynn | 2023 |
| 4 Way Refrigeration Services EOT Limited | King'S Lynn | 2023 |
| 4 Ways 2 Limited | Denmead | 2020 |
| 4 Ways Services Ltd | West Drayton | 2026 |
| 4 Weeks Limited | Selby | 2008 |
| 4 Wheel Motion - Car Hire Ltd | Wolverhampton | 2025 |
| 4 X 4 Hire (Scotland) Ltd. | Glasgow | 2000 |
| 4 X 4 Hire Limited | Romsey | 1991 |
| 4 YOU Valeting Centre Ltd | Stourbridge | 2025 |
| 4-6A Worcester Road E.17 Residents Association Limited | London | 2004 |
| 4-9 Harvington Park (Management) Limited | Letchworth Garden City | 2004 |
| 4-D Professional Limited | Chippenham | 2010 |
| 4-MJ Property Services Ltd | Birmingham | 2026 |
| 4-SIGHT Event Management Ltd | Bracknell | 2002 |
| 4-SIGHT Planning Services Limited | Glasgow | 1998 |
| 40 Campbell Road Ltd | Bow | 2013 |
| 40 College Road Management Company Limited | Bristol | 1996 |
| 40 Elbe Street Limited | Fulham | 2010 |
| 40 Fathoms Limited | London | 2020 |
| 40 Kings Road RTM Company Limited | Canterbury | 2010 |
| 40 Lower Park Road Hastings Limited | Hastings | 2008 |
| 40 Montrell Road Freehold Limited | Greater London | 2006 |
| 40 the Strand Management Company Ltd | Sittingbourne | 2019 |
| 40 Tolc Fish Ltd | Milton Keynes | 2019 |
| 40 Winchester Street Limited | Oxford | 1979 |
| 40-42 Myddelton Square Limited | London | 2008 |
| 40/20 Consultancy Services Limited | Ipswich | 2023 |
| 400 Capital Management Europe Limited | London | 2015 |
| 4000 Mondays Ltd | London | 2024 |
| 401 Cyber Security Limited | Rochford | 2015 |
| 401 Services Ltd | Blackburn | 2021 |
| 403 DUE North Limited | Dundee | 2011 |
| 4040 Limited | London | 2025 |
| 404NOTFOUND Ltd | Bedford | 2014 |
| 40:40 Recruitment Ltd | Ormskirk | 2016 |
| 41 Birdhurst Road Management Company Limited | London | 2004 |
| 411 LDN Ltd | London | 2024 |
| 41145 Ltd | Rosyth | 2017 |
| 412DL Limited | Middleton | 2016 |
| 412LG Limited | Middleton | 2023 |
| 414 Construction Ltd | South Croydon | 2016 |
| 414 Events Limited | Herne Bay | 2017 |
| 418 Centennial Park 2018 Limited | London | 2018 |
| 42 and 44 Godwyn Road Management Ltd | Deal | 2020 |
| 42 Arlingford Road RTM Company Ltd | London | 2012 |
| 42 Bluebell Way Ltd | Bristol | 2017 |
| 42 Bouverie Road West Ltd | Folkestone | 2007 |
| 42 Consultancy Limited | Buckingham | 2015 |
| 42 Degrees Coaching Services Limited | Cardiff | 2014 |
| 42 Durand Gardens 2019 Limited | Chandler'S Ford | 2019 |
| 42 Fitzroy Limited | Tolleshunt Major | 2020 |
| 42 Grams Ltd. | London | 2021 |
| 42 Heaton Grove Ltd | Newcastle Upon Tyne | 2015 |
| 42 High ST Ltd | Harrow On The Hill | 2014 |
| 42 M&P Ltd | London | 2012 |
| 42 Myatt Avenue Management Company Limited | Dudley | 2023 |
| 42 Oakfield Road Limited | Surrey | 1998 |
| 42 Redcliffe Road Limited | | 1983 |
| 42 Technologies Ltd | London | 2011 |
| 42 Upper Brook Ltd | London | 2014 |
| 42 Ventures Ltd | March | 2023 |
| 42 Wood Ltd | London | 2020 |
| 426 West Limited | Glasgow | 2018 |
| 429E Ltd | London | 2025 |
| 42IQ Ltd | London | 2013 |
| 42MEDIA Ltd | Norwich | 2013 |
| 42SHARP Ltd | Reading | 2014 |
| 42TETHERDOWNMANAGEMENT RTM Company Ltd | Hatfield | 2021 |
| 43 Eaton Road RTM Company Limited | Benfleet | 2018 |
| 43 Global Group Ltd | London | 2026 |
| 43 Tewksbury Street Limited | Cardiff | 2014 |
| 43 the Avenue Ealing Limited | London | 2006 |
| 43 Upper Richmond Road (Freehold) Limited | Harrow | 2013 |
| 432 Enterprises Ltd | Crewe | 2019 |
| 432 Solutions Ltd | Thurmaston | 2015 |
| 432WASL Ltd | London | 2026 |
| 433 Marketing Ltd | Birmingham | 2025 |
| 43MP Limited | Edinburgh | 2025 |
| 43PP Ltd | London | 2026 |
| 44 Bromley Road Freehold Limited | London | 2016 |
| 44 Carshalton Grove Limited | Surrey | 2008 |