| 1 Team Security and Risk Management Limited | Edgware | 2026 |
| 1 to BE Support Ltd | Hull | 2024 |
| 1 Touch Finance Limited | Reigate | 2014 |
| 1 UK Training Ltd | Ilford | 2015 |
| 1 UP Access Ltd. | Rotherham | 2008 |
| 1 UP Coaching Ltd | Altrincham | 2022 |
| 1 Upper Bridge Road Management Limited | Surrey | 1995 |
| 1 Verif Ltd | London | 2025 |
| 1 Villas Limited | London | 2014 |
| 1 Warren Ltd | Matlock | 2018 |
| 1 Waterloo Road (Management Company) Aldershot Limited | Farnborough | 2004 |
| 1 WFR Limited | Colchester | 2017 |
| 1 Wilton Crescent Freehold Limited | Aylesbury | 2011 |
| 1 WIN Limited | London | 2006 |
| 1- 2 Call Work Safe Ltd | King'S Lynn | 2010 |
| 1-1 Recruitment Limited | Eastleigh | 2000 |
| 1-10 Llys Rhostrefor RTM Company Ltd | Conwy | 2015 |
| 1-10 Ministry Way Limited | Mottingham | 2012 |
| 1-2-1 Global Ventures Ltd | Weston-Super-Mare | 2024 |
| 1-2-1 Live in Care Ltd | Bridgwater | 2021 |
| 1-2-1 Office Systems Ltd | London | 2022 |
| 1-2-1 Property Maintenance Ltd | Chesterfield | 2009 |
| 1-2-RELY on Limited | Ipswich | 2012 |
| 1-25 Clay Furlong RTM Company Limited | Leighton Buzzard | 2020 |
| 1-3 Bond Street Court (Spalding) Management Company Ltd | Hop Pole | 2021 |
| 1-4 Mill Court Limited | Radlett | 2001 |
| 1-5 the Old Rectory Limited | Heath Erith | 2000 |
| 1-DARIUS Electric Limited | Warrington | 2026 |
| 1-EXPERIENCE Group Ltd | Belfast | 2026 |
| 1-EXPERIENCE Recruitment Group Ltd | Belfast | 2025 |
| 1-EXPERIENCE Recruitment Ltd | Belfast | 2026 |
| 1-EXPERIENCE Training Academy Ltd | Belfast | 2026 |
| 1-EXPERIENCE Workplace Solutions Ltd | Belfast | 2026 |
| 1-HEALTHCARE Agency Ltd | Belfast | 2026 |
| 1.TEST.FRAME Ltd | Warrington | 2022 |
| 10 Acres Limited | Lutterworth | 2013 |
| 10 Belmont Grove Freehold Limited | London | 2004 |
| 10 Belsize Park Gardens Management Company Limited | | 1999 |
| 10 Brick Street Limited | London | 2023 |
| 10 Business Environments Limited | Wigan | 2010 |
| 10 Casewick Road Freehold Limited | Sidcup | 2006 |
| 10 Construction Services Limited | Worksop | 2026 |
| 10 Denmark Villas Hove Limited | Peacehaven | 1998 |
| 10 Dyne Road RTM Company Limited | London | 2016 |
| 10 Fitzroy Limited | London | 2004 |
| 10 Freemantle Square (Management) Company Limited | Bristol | 1981 |
| 10 Group Holdco Limited | London | 2014 |
| 10 Group Limited | London | 2009 |
| 10 HC Cran Limited | Milton Keynes | 2019 |
| 10 Helmsley Place Ltd | South Street | 2018 |
| 10 Leake Street Ltd | London | 2012 |
| 10 Moreton Place Ltd | London | 2006 |
| 10 OR More Limited | Gerrards Cross | 2019 |
| 10 Quinton Street Limited | Woking | 2002 |
| 10 Recruitment Ltd | Bolton | 2024 |
| 10 TIK Cleaning Ltd | Birmingham | 2025 |
| 10 Trinity Square Club Limited | London | 2012 |
| 10 Trinity Square Hotel Limited | London | 2012 |
| 10 Trinity Square Parking Limited | London | 2012 |
| 10 Trinity Square Residences Limited | London | 2012 |
| 10 Yetis Marketing & PR Limited | Swindon | 2005 |
| 10, Victoria Square (Bristol) Limited | Bristol | 1973 |
| 10-21 Kings Chase Freehold Limited | Kingston Upon Thames | 2007 |
| 10-UPS Management Co. Limited | Ceredigion | 2005 |
| 10.WEN Services Ltd | Malvern | 2012 |
| 10/12 Horbury Crescent Residents Association Limited | | 1993 |
| 100 & Eleven Limited | Burnley | 2016 |
| 100 Broken Windows Limited | London | 2015 |
| 100 Burnt ASH Hill Ltd | London | 2024 |
| 100 Gurney Road Limited | London | 2018 |
| 100 Midland Road 2010 Ltd | London | 2010 |
| 100% Clean Ltd | Cardiff | 2017 |
| 100% Green Limited | Crewe | 2006 |
| 100% IT Recruitment Limited | London | 2004 |
| 1000 Mile Travel Group Ltd | London | 2017 |
| 10000 Hours Ltd | Leatherhead | 2015 |
| 10000 Millionaires Ltd | Christchurch | 2016 |
| 1000HEADS Group Limited | London | 2000 |
| 1004 Enclave Limited | Swaffham | 2024 |
| 100GREEN Limited | Milton Keynes | 2024 |
| 100MYLYFE Ltd | Melton Mowbray | 2020 |
| 101 Business Services Limited | Croydon | 2026 |
| 101 Healthcare Ltd | Edgware | 2017 |
| 101 Locations Limited | Hemel Hempstead | 2011 |
| 101 Locksmiths Ltd | Wokingham | 2017 |
| 101 Management Ltd | Leicester | 2009 |
| 101 Property Services Limited | Harrow | 2016 |
| 101 Security Group Ltd | Kent | 2020 |
| 101 Security Services Limited | Hemel Hempstead | 2016 |
| 101 Services Limited | Alford | 2019 |
| 101 Signs Scotland Ltd | Glasgow | 2023 |
| 101 Studios UK Limited | London | 2023 |
| 1010 Media Limited | London | 2009 |
| 1010 Printing (UK) Limited | Surrey | 2007 |
| 102 West HAM Lane Ltd | Bristol | 2022 |
| 1021 Creative PTE UK Ltd | London | 2024 |
| 103 Grandfield Avenue RTM Company Limited | Aylesbury | 2014 |
| 10300296 Limited | London | 2016 |
| 104 Exelient Ltd | Poole | 2017 |
| 104 Nibthwaite Road Management Ltd | Harrow | 2013 |