| 1 Click Magic HK Ltd | Hamilton | 2024 |
| 1 Cloud Consultants Ltd | Bristol | 2019 |
| 1 Coburg Terrace and 18/19 Fore Street Management Company Limited | Ilfracombe | 1990 |
| 1 Consilium Legal Ltd | London | 2026 |
| 1 DEG. West Marine (Hamble) Ltd | Portsmouth | 2019 |
| 1 DEG. West Marine Limited | Northumberland Road Portsmouth | 2002 |
| 1 Degree West Limited | Birmingham | 2013 |
| 1 Degree West, Maritime and Aerial Solutions Limited | Poole | 2022 |
| 1 Demontalt Place Management Company Limited | Cardiff | 2000 |
| 1 Design & Development Ltd | Kenley | 2021 |
| 1 Design Associates Limited | Coventry | 2014 |
| 1 Digital-Shelf Ltd | London | 2025 |
| 1 DMC World Ltd | Lymington | 2017 |
| 1 Easy Translation Limited | London | 2022 |
| 1 Eliot Park Management Company Limited | Greenwich | 2004 |
| 1 Extra Seat Limited | London | 2019 |
| 1 Financing Limited | Colchester | 2022 |
| 1 Fire Safety Solution Ltd | Sheffield | 2018 |
| 1 Fiscal Provider Limited | St. Helens | 2021 |
| 1 Foot in Reality Limited | Brighton | 2025 |
| 1 for ALL Accounting Angels Ltd | Nottingham | 2016 |
| 1 Formula Ltd | Pinner | 2013 |
| 1 Goal Industry Limited | Preston | 2014 |
| 1 Granary Ltd | London | 2013 |
| 1 GWD Ltd | Basildon | 2024 |
| 1 Health Hub Limited | Northampton | 2021 |
| 1 Heene Road Limited | Worthing | 2009 |
| 1 High Street Poole Limited | London | 2014 |
| 1 Hour Photo Excellence Service Limited | Essex | 2000 |
| 1 Hour Project | Northampton | 2020 |
| 1 Ifield Road Management Limited | Newcastle Upon Tyne | 1997 |
| 1 Kensington Place Bath (Management) Limited | | 1982 |
| 1 Key Solution Limited | Leicester | 2017 |
| 1 Kings Avenue Management Limited | London | 2005 |
| 1 Knockhall Road Limited | Greenhithe | 2013 |
| 1 Knoll Road Management Company Limited | London | 1991 |
| 1 Lane Motors Ltd | London | 2025 |
| 1 Law Solicitors Ltd | Birmingham | 2021 |
| 1 Less Worry Payroll Services Cornwall Ltd | Plymouth | 2022 |
| 1 Less Worry Payroll Services Ltd | Plymouth | 2014 |
| 1 Leta Umbrella Ltd | Welwyn Garden City | 2020 |
| 1 Liverpool Street GP Limited | Fareham | 2021 |
| 1 Liverpool Street Nominee 1 Limited | Fareham | 2021 |
| 1 Liverpool Street Nominee 2 Limited | Fareham | 2021 |
| 1 Lock Cyber Security Ltd | Harrow | 2022 |
| 1 Lock Energy Solutions Limited | Harrow | 2023 |
| 1 Nation Media Limited | Birmingham | 2012 |
| 1 Network Services Limited | Bristol | 2013 |
| 1 Northbrook Road Management Company Limited | Aldershot | 2008 |
| 1 Oak Services Limited | Sudbury | 2025 |
| 1 Oak Training Ltd | Croydon | 2023 |
| 1 of 1 Consultancy Ltd | London | 2026 |
| 1 Onkar Limited | Uxbridge | 2026 |
| 1 Plus 1 Equals 3 Ltd | Ormskirk | 2023 |
| 1 Plus Media Group Limited | Havant | 2009 |
| 1 Plus.Net Limited | Havant | 2007 |
| 1 Point 8 Ltd | Melton Mowbray | 2017 |
| 1 Pound Wins Ltd | London | 2025 |
| 1 Procom Ltd | Llandrindod Wells | 2015 |
| 1 Red Frog Limited | Worcester Park | 2012 |
| 1 Roman Road (Management Company) Limited | Portsmouth | 2012 |
| 1 SMD Ltd | Leicester | 2016 |
| 1 Solution Group Ltd | Sheffield | 2015 |
| 1 ST. Mary's Building Limited | Bath | 2008 |
| 1 Step Ahead Immigration Services Ltd | Nottingham | 2023 |
| 1 Stop Accountancy Audit and Taxation Limited | Haslemere | 2010 |
| 1 Stop BID Consultancy Ltd | Leeds | 2022 |
| 1 Stop Care Hub Limited | Mildenhall | 2024 |
| 1 Stop Graphics Ltd | Cardiff | 2019 |
| 1 Stop Medical Compliance Ltd | Bury St. Edmunds | 2024 |
| 1 Stop PAT Testing Ltd | Gateshead | 2023 |
| 1 Stop Property Management & Accounting Ltd | Leeds | 2019 |
| 1 Stop Renewables Limited | Bridge Of Weir | 2009 |
| 1 Stop Renewables Ventura Limited | Bridge Of Weir | 2011 |
| 1 Stop Safety 2015 Ltd | Armagh | 2019 |
| 1 Surrenden Road Limited | East Sussex | 2002 |
| 1 Take Entertainment Limited | London | 2025 |
| 1 Tax Accountants Ltd | Glasgow | 2024 |
| 1 Team Energy Ltd | Harpenden | 2010 |
| 1 Thing More Limited | Highwoods, Colchester | 2013 |
| 1 Tick Solutions Ltd | Ryde | 2026 |
| 1 to 1 Accountants Limited | Uxbridge | 2011 |
| 1 to 100 Ltd | London | 2024 |
| 1 Translation Limited | Coventry | 2026 |
| 1 Troy Ltd | Birmingham | 2020 |
| 1 Two 1 Direct Ltd | London | 2006 |
| 1 Umbrella Ltd | Leicester | 2009 |
| 1 Unified Collaborations Limited | Brighton | 2006 |
| 1 Upper Station Road (Management Company) Limited | Bristol | 2008 |
| 1 Victoria Street Management Company Limited | Llandudno | 2001 |
| 1 W Training Ltd | London | 2020 |
| 1 Wallenberg Place Limited | London | 2020 |
| 1&1 Underwater Search Consultants Ltd | Devizes | 2023 |
| 1,NEWPORT Street,Dartmouth,Limited | Dartmouth | 1986 |
| 1-11 Compliance Group Ltd | Wakefield | 2021 |
| 1-12 Brondesbury Park Mansions RTM Company Limited | London | 2014 |
| 1-2 Valley Close Limited | Pinner | 2015 |
| 1-2-1 Accountancy (UK) Ltd | Cradley Heath | 2011 |
| 1-2-1 Payroll & Bookkeeping Ltd | Walsall | 2015 |
| 1-2-10 Transformation Ltd | Knutsford | 2020 |