| Adonai Investments Limited | West Bromwich | 2026 |
| Adonai Sports Management Ltd. | Doncaster | 2025 |
| Adonai Ventures Limited | Rugby | 2026 |
| Adonis Acquisitions Ltd | Brighton | 2013 |
| Adonis Holdings Limited | Bicester | 2015 |
| Adora Financial Services Limited | Harrow | 2006 |
| Adore Property (London) Ltd | London | 2021 |
| Adoreum Holdings Limited | Haywards Heath | 2020 |
| Adorn ME World Studios Ltd | London | 2026 |
| Adoti Ltd | Barking | 2005 |
| Adova Innovations Ltd | London | 2019 |
| ADP 2024 Limited | Birmingham | 2024 |
| ADP Capital UK Co Ltd | London | 2024 |
| ADP Carpet Distribution Limited | Halesowen | 2020 |
| ADP Forresters Unlimited | Frodsham | 2023 |
| ADP III Holding 11 Limited | London | 2023 |
| ADP III Holding 12 Limited | London | 2024 |
| ADP III Holding 7 Limited | London | 2022 |
| Adpak Machinery Systems Holdings Limited | Nelson | 2025 |
| Adparo Group Limited | Southend On Sea | 2018 |
| Adpol Holdings Ltd | Hove | 2026 |
| ADR Financial Services Limited | Swansea | 2019 |
| ADR Funding Ltd | Beaconsfield | 2016 |
| ADR Group Limited | Leigh-On-Sea | 1993 |
| Adraba Falkirk Midco Limited | London | 2026 |
| Adraba Swansea Midco Ltd | London | 2026 |
| Adraba Whitchurch Cardiff Midco Ltd | London | 2026 |
| Adrad Commercial Holdings Ltd | Sheffield | 2021 |
| Adrc Holding Limited | Leicester | 2026 |
| Adrd Holdings Limited | Warrington | 2018 |
| Adre Partners Limited | London | 2017 |
| Adrenalin Trading Limited | Buckingham | 2022 |
| Adrest Ltd | London | 2022 |
| Adrg Services Ltd | Leigh-On-Sea | 2019 |
| Adria Asset Holdings International Ltd | London | 2021 |
| Adria Capital Partners Ltd | London | 2013 |
| Adria Holding Ltd | London | 2024 |
| Adrian Barratt Swfp Limited | Chorley | 2007 |
| Adrian Brown Associates Limited | | 2004 |
| Adrian Connelly Wealth Management Limited | Solihull | 2013 |
| Adrian COX Asset Management Ltd | Clarbeston Road | 2010 |
| Adrian F Bloomfield Limited | Market Harborough | 2002 |
| Adrian Fagg Holdings Limited | Ipswich | 2025 |
| Adrian Firth Ltd | Bury St. Edmunds | 2013 |
| Adrian Francis Group Limited | Manchester | 2012 |
| Adrian Gallagher Ltd | Carrickfergus | 2019 |
| Adrian Garstang Limited | Milton Keynes | 2008 |
| Adrian Hornett Wealth Management Ltd | Llanharan | 2019 |
| Adrian Maye Safety Services Ltd | Ballygawley | 2022 |
| Adrian Nuttall Limited | Gloucester, | 2002 |
| Adrian RAY Holdings Limited | Bradford | 2024 |
| Adrian Russ Holding Limited | London | 2024 |
| Adrian Smith Rating Limited | Beverley | 2010 |
| Adrian Smith Wealth Management Limited | Blackpool | 2015 |
| Adrian Styles Holdings Limited | Solihull | 2021 |
| Adrian TAN Holding Ltd | Altrincham | 2026 |
| Adrian W.Morris Limited | Carmarthenshire | 2014 |
| Adrian White Wealth Management Limited | Stafford | 2022 |
| Adriana Holdings Limited | Monmouth | 2011 |
| Adriatic Financial Company Ltd | London | 2021 |
| Adriatica Holding Ltd | London | 2017 |
| Adriel Property Management Limited | Wellingborough | 2024 |
| Adrix Technology Holding Limited | London | 2021 |
| ADRIYA1 Solutions Ltd | Northwood | 2018 |
| Adroit Developments Ltd | London | 2023 |
| Adroit Economics Holdings Limited | Macclesfield | 2024 |
| Adroit Financial Planning Limited | London | 2012 |
| Adroit Financial Services Limited | Pinner | 2020 |
| Adroit Group Dental Ltd | Deeside | 2020 |
| Adroit Wealth Management Ltd | London | 2015 |
| Adromedae Holdings Ltd | Bradford | 2020 |
| ADS 98 Limited | Edgware | 2021 |
| ADS BDC Holdings (UK) Ltd | Greater London | 2026 |
| ADS Decorating Group Ltd | Romford | 2020 |
| ADS Group Holdings Ltd | Wirral | 2023 |
| ADS Holding Group Ltd | Chorley | 2026 |
| ADS Technology Solutions UK Limited | London | 2014 |
| ADS3 2020 Limited | Halesworth | 2020 |
| Adsafe Holdings Ltd | Bewdley | 2022 |
| Adsam Holdings Ltd | London | 2022 |
| Adsave Holdings Ltd | Birmingham | 2019 |
| Adsave Limited | Birmingham | 2011 |
| Adscap Ltd | Portsmouth | 2024 |
| Adsen Moore Holding Co Ltd | Ilford | 2016 |
| Adsi Business Services Limited | Basildon | 2021 |
| Adsight Ltd | Manchester | 2025 |
| Adson Holdings Ltd | Portsmouth | 2022 |
| Adstone Steel Construction Limited | Droitwich | 2025 |
| ADT Capital Ltd | Virginia Water | 2013 |
| ADT Family Investments Limited | Whitefield | 2023 |
| ADT Finance Limited | Sunbury On Thames | 1985 |
| ADT Financial Services Limited | Radstock | 2007 |
| ADT Partners Limited | Halesowen | 2021 |
| ADT Workplace (Holdings) Limited | Manchester | 2019 |
| Adtac London Limited | London | 2015 |
| Adtech Investments Limited | Potters Bar | 2020 |
| Adtelligent Holdings Limited | London | 2024 |
| Adthc Limited | Hinckley | 2022 |
| Adtibe Venture Holdings Ltd | Cheltenham | 2022 |
| Aduampholdings Company Ltd | Kington | 2025 |