| Adeptio Law Midco Limited | Wolverhampton | 2024 |
| Adeptio Law Topco Limited | Wolverhampton | 2024 |
| Adeptio Wealth Management Ltd | Birkenhead | 2021 |
| Adeptis Holdings Limited | Hailsham | 2019 |
| Adeptive (UK) Holdings Limited | London | 2020 |
| Adeptus Capital Ltd | Ibstock | 2020 |
| Adeptus London (1988)LIMITED | Greenfield Road Pulloxhill | 1979 |
| Adera Holdings Ltd | London | 2025 |
| Aderi Enterprises Ltd | London | 2025 |
| Adesewa Limited | Canterbury | 2024 |
| Adeshield Limited | Warrington | 2025 |
| Adesho & SON Security Limited | Manchester | 2025 |
| Adesida Enterprise Limited | Cardiff | 2014 |
| Adesley Schneider Holdings Limited | West Malling | 2020 |
| Adevar Limited | Harrogate | 2022 |
| Adeve Holdings Limited | Wirral | 2025 |
| Adewuyi Holdings Ltd | Durham | 2026 |
| Adex Holdings Limited | Leighton Buzzard | 2017 |
| Adex Markets Ltd | London | 2022 |
| Adexa Limited | London | 2018 |
| Adexen Consulting Ltd | Romsey | 2012 |
| Adeyemi Capital Ltd | London | 2025 |
| ADF Asset Management (UK) Limited | Cambridge | 2024 |
| ADF Claims Advisory Ltd | London | 2026 |
| ADF Financial Consulting Ltd | Salisbury | 2014 |
| ADF Holdings Ltd | Estover | 2024 |
| ADF Pricing Solutions Limited | Orpington | 2014 |
| Adfen Investments Limited | Carterton | 2013 |
| Adferg Limited | Wembley | 2011 |
| Adfx Trading Ltd | Tonbridge | 2019 |
| ADG Consultancy International Ltd | Wembley | 2023 |
| ADG Corporate Ltd | London | 2016 |
| ADG Financial Consultants Limited | Wickford | 2012 |
| ADG Group Holdings Ltd | Craigavon | 2016 |
| ADG Group Limited | Stoke-On-Trent | 2022 |
| ADG Velente Ltd | London | 2024 |
| Adg-Ia Group Limited | London | 2025 |
| Adgie Wealth Services Ltd | Hornsea | 2023 |
| Adgin Green Limited | London | 2010 |
| Adgrand Ltd | Dunstable | 2023 |
| ADH Financial Services Ltd | Cheadle Hulme | 2019 |
| ADH Holdings Limited | Canterbury | 2026 |
| ADH Property Holdings (London) Limited | Borehamwood | 2026 |
| Adhen Holdings Ltd | Bedfordshire | 2021 |
| Adhesive Innovation Group Ltd | Bradford | 2021 |
| Adhikaram Corporation Ltd | London | 2025 |
| Adhitch Group Ltd | Bournemouth | 2026 |
| Adhr NW Ltd | Thornton-Cleveleys | 2025 |
| ADI Emea Limited | Oldham, England | 2026 |
| Adiannah Limited | Norwich | 2018 |
| Adib (UK) Limited | London | 2010 |
| Adidev Financial Solutions Limited | Bushey | 2019 |
| Adido Hold Limited | Bournemouth | 2020 |
| Adiel Services Ltd | Billericay | 2024 |
| Adient Financing International Ltd | London | 2016 |
| Adigi Holdings Limited | Harrogate | 2023 |
| Adiguru Ltd | London | 2024 |
| Adika Group Ltd | Bristol | 2025 |
| Adil Chohan Ltd | Chorley | 2016 |
| Adil Holdings Ltd | Morden | 2026 |
| Adil Restaurants Limited | Wembley | 2010 |
| Adilson Limited | Wembley | 2010 |
| Adima Holdings Limited | Peterborough | 2023 |
| Adima Limited | Colchester | 2025 |
| Adimus Limited | Sale | 2011 |
| Adinijeconsultant Limited | Bristol | 2025 |
| Adino Capital Limited | Ashford | 2023 |
| Adinwest Europe Limited | Cardiff | 2015 |
| Adio Limited | Haddington | 2023 |
| Adiona Holdings Limited | London | 2022 |
| Adiona Technologies Limited | London | 2020 |
| Adira Asset Management Limited | London | 2024 |
| Adira Financial Services Ltd | Anlaby | 2022 |
| Adit Digital Finance Limited | London | 2022 |
| Aditya Capital Ltd | Pinner | 2021 |
| Adiuto Limited | Chester | 2015 |
| Adiuvara Limited | Loughborough | 2018 |
| Adiuvo FS Limited | Southend On Sea | 2017 |
| Adivo Investments Limited | Beaconsfield | 2018 |
| Adjaye Holdings Limited | London | 2015 |
| Adjem Ltd | Edinburgh | 2018 |
| Adjoin Homes Limited | London | 2021 |
| Adjs Holdings Ltd | Neath | 2024 |
| Adjunct Value Partners Limited | London | 2024 |
| Adjusteck Ltd | London | 2020 |
| Adjusting & Management Solutions (UK) Ltd | Harpenden | 2012 |
| Adjusting Limited | Preston | 2018 |
| Adjusting Services Limited | London | 1975 |
| Adjustopen Holdings Limited | Newcastle Upon Tyne | 2018 |
| Adjuvo Care Group Limited | Salford | 2018 |
| Adjuvo Holdings Limited | Birmingham | 2020 |
| ADK Consultancy (NW) Ltd | Colwyn Bay | 2026 |
| ADK Group Holdings Ltd | London | 2022 |
| ADK Holdings Limited | Bolton | 2015 |
| Adke Topco Limited | St. Ives | 2025 |
| Adkin Freeman Holdings Ltd | Greenford | 2024 |
| Adkin Holding Group Ltd | Skipton | 2022 |
| Adkins Group Limited | Winchester | 2025 |
| Adkins Holdings Limited | Shrewsbury | 2023 |
| Adkins Property Group Ltd | Winchester | 2025 |