| 365 Aerospace Design (UK) Limited | Letchworth Garden City | 2019 |
| 365 Aerospace Ltd | Letchworth Garden City | 2014 |
| 365 Compli Ltd | Wirral | 2023 |
| 365 Compliance Ltd | Canvey Island | 2025 |
| 365 Consultancy Ltd | London | 2021 |
| 365 Contractors Ltd | Bristol | 2009 |
| 365 Controls System Ltd | Leicester | 2022 |
| 365 Corporate Services Ltd | Wimborne | 2023 |
| 365 Creative Limited | Newport Pagnell | 2014 |
| 365 Design and Advertising Limited | Heswall | 2007 |
| 365 Digital Limited | London | 2020 |
| 365 Digital Marketing Limited | Birmingham | 2024 |
| 365 Employment Law Limited | Worthing | 2019 |
| 365 Engineering Ltd | Wirral | 2018 |
| 365 Engineering Services Ltd | Lytham St. Annes | 2026 |
| 365 Engineering Solutions Ltd | Peterborough | 2022 |
| 365 Group Holdings Ltd | Huddersfield | 2019 |
| 365 Industries Ltd | Congleton | 2014 |
| 365 Inspire Care Services Limited | London | 2025 |
| 365 Investment Management Limited | Southampton | 2019 |
| 365 IT Management Limited | Herts | 2017 |
| 365 Languages Ltd | Leicester | 2025 |
| 365 Legal Services Ltd | Newcastle Upon Tyne | 2023 |
| 365 Media Group Limited | Middlesex | 2001 |
| 365 Safety Limited | Fareham | 2025 |
| 365 Services by Marusia Ichim Ltd | Maidstone | 2023 |
| 365 Short Stays Ltd | Rotherham | 2022 |
| 365 Switch on Electrics Ltd | Watford | 2026 |
| 365 Umbrella Ltd | Poole | 2022 |
| 365ADMIN Limited | Shipston-On-Stour | 2015 |
| 366 Ltd | London | 2022 |
| 368 Consulting Limited | Barking | 2024 |
| 368 Marketing Ltd | London | 2024 |
| 369 Consulting Ltd | Doncaster | 2025 |
| 369 Design Group Ltd | London | 2023 |
| 369 Media Inc Ltd | Blackpool | 2025 |
| 369 Professional Services Ltd | Cambridge | 2026 |
| 369 Trading Group Ltd | Cardiff | 2020 |
| 369MARKETINGUK Ltd | Southport | 2026 |
| 369SOLUTIONS Limited | Windsor | 2026 |
| 36DEGREES | Wakefield | 2017 |
| 36EXP Photography Ltd | London | 2013 |
| 36IXTY Solutions Ltd | London | 2024 |
| 36T Hub Intl Limited | West Drayton | 2021 |
| 36TEE Visuals Ltd | London | 2024 |
| 36TY Construction Consultants Ltd | Bury St. Edmunds | 2019 |
| 36VDR Limited | London | 2026 |
| 37 Ainger Road Management Limited | London | 2006 |
| 37 Beaulieu Road Management Company Limited | Bournemouth | 2006 |
| 37 Ceylon Road Limited | Royal Arsenal | 2008 |
| 37 Chichester Place Limited | Brighton | 2000 |
| 37 Clifton Road RTE Limited | Cambridge | 2010 |
| 37 Degrees South Consulting Limited | Dartmouth | 2017 |
| 37 Dyke Road Drive Limited | Brighton | 2013 |
| 37 Edin Ltd. | Prestonpans | 2004 |
| 37 Gloucester Drive (Freehold) Ltd | | 2003 |
| 37 Highbury Park Limited | London | 2010 |
| 37 HR Limited | London | 2026 |
| 37 Josephine Avenue Management Company Limited | London | 1993 |
| 37 ST. Augustines Road Limited | Aylesbury | 2001 |
| 37 Trent Road Residents Limited | | 2002 |
| 37/37A Fore Street Management Company Limited | Kingsbridge | 1998 |
| 370 Consulting Ltd | Perth | 2025 |
| 370 Impact Ltd | Weston Super Mare | 2022 |
| 3705 Limited | Southall | 2005 |
| 371 Banbury Road Management Company Limited | Oxford | 2012 |
| 371 Chiswick High Road Management Limited | Windsor | 2002 |
| 371 Success Limited | Poulton-Le-Fylde | 2026 |
| 3745 Business Coaching Limited | Romford | 2009 |
| 375 Bensham Lane RTM Company Limited | London | 2012 |
| 375 Creative Limited | Bristol | 2004 |
| 376 Stanstead Road (Freehold) Limited | London | 2010 |
| 379 Taxis Ltd. | Glasgow | 2018 |
| 37FM Ltd | Eastleigh | 2019 |
| 37POINT5 Limited | Hartford | 2004 |
| 38 Baker Street Limited | Reading | 1979 |
| 38 Becmead Avenue Limited | London | 2009 |
| 38 Belsize Square Limited | Watford | 2010 |
| 38 Consultancy (NE) Ltd | Middlesbrough | 2026 |
| 38 Consulting Ltd | Thames Ditton | 2015 |
| 38 Degrees Training and Business Support Ltd. | Morecambe | 2007 |
| 38 Entertainment Group Ltd | London | 2019 |
| 38 Frognal (RTE) Limited | London | 2003 |
| 38 Havelock Road Limited | | 2006 |
| 38 Lower Cathedral Road Limited | Cardiff | 2008 |
| 38 Lower Oldfield Park Bath (Management) Limited | Bristol | 1985 |
| 38 Reigate Hill Ltd | Betchworth | 2014 |
| 38 Southwick Street Limited | London | 2001 |
| 38 Sutherland Square Management Limited | London | 1991 |
| 38 Talent Ltd | London | 2025 |
| 38 Upper Tollington Park Limited | | 1999 |
| 3800 Limited | Sheffield | 2021 |
| 3804242 Limited | London | 1999 |
| 381 ABS UK Ltd | Birmingham | 2011 |
| 381 Accountancy and Bookkeeping Services Ltd | London | 2010 |
| 381 Fulham Palace Road Limited | London | 2007 |
| 381 Ward Holdings Ltd | Newcastle Upon Tyne | 2021 |
| 381A Idrissi Limited | Leeds | 2011 |
| 382 Taxis Ltd. | Edinburgh | 2007 |
| 383 Group Limited | London | 2016 |