| Advocacy and Health Ltd | St. Leonards-On-Sea | 2017 |
| Advocacy Direct Group Limited | West Wickham | 2018 |
| Advocap Services Ltd | Blackburn | 2025 |
| Advocare Recruitment Ltd | Deeside | 2023 |
| Advocate Agency Limited | London | 2000 |
| Advocate Associate Consultants Limited | Liverpool | 2012 |
| Advocate Compliance Ltd | Wrexham | 2012 |
| Advocate Events & Tours Ltd | Tunbridge Wells | 2024 |
| Advocate Group International Ltd | Liverpool | 2024 |
| Advocate INK Ltd | Hyde | 2025 |
| Advocate of Right Mindset Initiatives | Bradford | 2026 |
| Advocate Properties Ltd | Brigg | 2018 |
| Advocate Recruitment Ltd | Gateshead | 2015 |
| Advocatus Financial Limited | Warrington | 2013 |
| Advocitude Ltd | Corby | 2024 |
| Advoco Solutions Limited | Reading | 2007 |
| Advojust Ltd | London | 2019 |
| Advr Limited | Warrington | 2024 |
| ADW Blades Limited | Newport | 2026 |
| ADW Fire & Security Ltd | Chesterfield | 2018 |
| ADW Hire Ltd | Aberdeen | 2019 |
| Adway Associates Limited | Marlborough | 1995 |
| Adway Associates-Executive Search Limited | London | 2001 |
| Adway Marketing Ltd | Bristol | 2024 |
| Adwell Environmental Limited | Orpington | 1998 |
| Adwen Services (UK) Ltd | London | 2014 |
| Adwick Cleaning Services Ltd | Doncaster | 2024 |
| Adwill Associates Limited | Pontyclun | 2016 |
| Adwizz Limited | Redditch | 2022 |
| Adworld Conferences Limited | Ilford | 2021 |
| ADX Environmental Services Ltd | Sheffield | 2026 |
| ADX Karting Ltd | London | 2023 |
| ADX Security Ltd | London | 2020 |
| ADY Kent Ltd | Gillingham | 2016 |
| ADY Limited | Bromley | 2005 |
| Ady&George Ltd | Maidstone | 2024 |
| Ady-Hv Investments Limited | Wrotham Heath | 2022 |
| Ady.Ro Ltd | Loughton | 2011 |
| Adyan & Co UK Ltd | London | 2023 |
| Adytailing Ltd | York | 2023 |
| ADYTRANS2018 Ltd | Northampton | 2018 |
| ADZ Consulting Limited | London Nw3 | 2011 |
| ADZ Global Limited | Kirkcaldy | 2018 |
| ADZ Professional Limited | Isleworth | 2021 |
| ADZ Securtiy Limited | Haywards Heath | 2025 |
| ADZ Services Ltd | Bridgwater | 2024 |
| ADZ Travel Solutions Ltd | Newport | 2025 |
| ADZ Ventures Ltd | Church Stretton | 2022 |
| Adzdaramola Limited | Salford | 2022 |
| Adzerk Ltd. | London | 2019 |
| Adzor Ltd | Hereford | 2006 |
| Adzsell Car Hire Limited | Nottingham | 2020 |
| AE & AG Leasing Limited | London | 2018 |
| AE Agency for Sales Promotion and Marketing Ltd | London | 2025 |
| AE Alternative Energy Group Ltd | London | 2022 |
| AE BIA Assessments Limited | Altrincham | 2016 |
| AE Blackman Consultancy Ltd | London | 2024 |
| AE Business Analysts Limited | Ruislip | 2024 |
| AE Business Support Limited | Rochester | 2025 |
| AE Cleaning Limited | Sutton Coldfield | 2022 |
| AE Concepts Limited | Ludlow | 2024 |
| AE Contracting Ltd | Slough | 2013 |
| AE Creatives Limited | London | 2012 |
| AE Europe Limited | Newcastle Upon Tyne | 2003 |
| AE Matheson Ltd | Salisbury | 2006 |
| AE Member Services Limited | City Of London | 2019 |
| AE Morgan Ltd | London | 2016 |
| AE Presents Ltd | Epsom | 2023 |
| AE Properties (UK) Limited | London | 2014 |
| AE Recruitment Ltd | London | 2010 |
| AE Security Services Limited | Sheffield | 2015 |
| AE Simplicity Limited | Maidstone | 2016 |
| AE Supreme Cleaning and Maintenance Ltd | Aylesbury | 2025 |
| AE Talent Solutions Ltd | London | 2023 |
| AE Technical Production Limited | Bourne | 2020 |
| AE Trading Ltd | Manchester | 2014 |
| AE Valeting Ltd | Doncaster | 2022 |
| AE Window Cleaning Service Ltd | Mildenhall | 2023 |
| Ae&I Technical Services Limited | Barrow-In-Furness | 2021 |
| AE3 Limited | London | 2014 |
| AE4 Ltd | Honiton | 2024 |
| AEA Productions Ltd | Stonehaven | 2023 |
| AEA Rose Consulting Limited | Ilford | 2025 |
| AEA Super Cleaning Services Limited | Leatherhead | 2022 |
| Aeaa Limited | Erith | 2017 |
| Aeal Ltd | London | 2023 |
| AEB Business Solutions Ltd | London | 2023 |
| AEB Care Staffing Solutions Ltd | Nottingham | 2023 |
| AEB Estates Limited | Hull | 2017 |
| AEB Lymm Limited | Lymm | 2020 |
| AEB STB Ltd | Middlesbrough | 2022 |
| AEB Technicals Limited | Chatham | 2018 |
| Aebroofingservices Limited | Dover | 2021 |
| AEC Consultant Limited | London | 2022 |
| AEC Contractors Ltd | Southport | 2009 |
| AEC Enterprises Limited | Buckingham | 2020 |
| AEC FIX Limited | London | 2017 |
| AEC Independent Ltd | Milton Keynes | 2014 |
| AEC Live Ltd | Barnsley | 2011 |
| AEC Management Services Limited | Aldeburgh | 1978 |