| ADG Property Maintenance Ltd | Southampton | 2019 |
| ADG Property Services Ltd | Brackley | 2024 |
| ADG Sweepz Limited | Redditch | 2025 |
| Adge Enterprises Limited | London | 2019 |
| Adgen Holdings Limited | Leamington Spa | 2015 |
| Adgen Limited | Leamington Spa | 2011 |
| Adgenda Media International Limited | London | 2011 |
| Adgh Contracts Limited | Stockton-On-Tees | 2014 |
| Adgiftsonline Limited | Cheadle | 1998 |
| ADH Engineering Consultants Limited | Ulverston | 2012 |
| ADH Holdings 3 Limited | Congleton | 2016 |
| ADH Labour Providers Limited | Boston | 2010 |
| Adhams Barber Ltd | Crawley | 2017 |
| Adhara One Limited | Hereford | 2021 |
| Adhb Consultancy Ltd | Motherwell | 2014 |
| Adhd Club Limited | Letchworth | 2024 |
| Adhd HER Ltd | Aylesbury | 2024 |
| Adhd Hub Gloucestershire CIC | Cheltenham | 2022 |
| Adhd Islington C.I.C. | London | 2026 |
| Adhdspecialistclinicuk Ltd | Poole | 2025 |
| Adhere Lining Ltd | London | 2023 |
| Adhere Ltd | Tring | 2015 |
| ADHERE2 Ltd | Dartford | 2024 |
| Adherium Europe Ltd | Birmingham | 2016 |
| Adhesive Technical Services Limited | Essex | 2006 |
| Adhia Limited | South Ockendon | 2025 |
| Adhior Limited | Bristol | 1999 |
| Adhiti Limited | Slough | 2011 |
| Adhoc Admin Staffs Ltd | Stoke-On-Trent | 2026 |
| Adhoc Consulting Limited | West Yorkshire | 2001 |
| Adhoc HR Ltd | Dingwall | 2017 |
| Adhoc Security Services Ltd | Bradford | 2021 |
| Adhoc Solutions Ltd | Pencoed, Bridgend | 2017 |
| Adhore Limited | London | 2019 |
| Adhr Limited | Southport | 2017 |
| Adhya Tours & Travel Ltd | Wembley | 2023 |
| ADI American Distributors Limited | Buckhurst Hill | 2006 |
| ADI Automotive Services Limited | Birmingham | 2011 |
| ADI Chiriac Ltd | Cardiff | 2019 |
| ADI Europe Limited | Bolton | 1999 |
| ADI Fire and Security Limited | Birmingham | 2010 |
| ADI Group Holdings Ltd | London | 2026 |
| ADI Landscaping Services Ltd | Wellingborough | 2022 |
| ADI Logo R US Ltd | Leeds | 2025 |
| ADI Prestige Car Wash Ltd | Hayes | 2022 |
| ADI Rescue Ltd | Nottingham | 2024 |
| ADI Security Services Limited | Sandford | 2020 |
| ADI Supply Limited | Brierley Hill | 2003 |
| ADI UK Limited | Bolton | 1997 |
| ADI Waste Systems Limited | Birmingham | 2010 |
| Adi's Autos Limited | Chippenham | 2010 |
| Adic Vigilant Ltd | Dartford | 2018 |
| Adidev Ltd | London | 2014 |
| Adido Property Limited | Bournemouth | 2021 |
| Adie First Ltd | London | 2014 |
| Adient UK Financing Ltd | London | 2016 |
| Adifestklean Ltd | Nottingham | 2026 |
| Adimpleo Limited | London | 2019 |
| Adina Cleaning Limited | Edgware | 2025 |
| Adina Limited | Goole | 2005 |
| Adina Seven Limited | Kingston Upon Thames | 2016 |
| Adinal Mcgregor Limited | London | 2012 |
| Adinkra (UK) Limited | Lymington | 2006 |
| Adinum Services Ltd | London | 2019 |
| Adinvale Limited | Chichester | 2001 |
| Adio Services Ltd | Easington | 2016 |
| Adis (NE) Ltd | Stockton-On-Tees | 2014 |
| Adisco - Links International Ltd | London | 2016 |
| Adismoto Ltd | Bridport | 2025 |
| Adispan UK Ltd | Harrow | 2025 |
| Aditi Consultancy and Medical Services Ltd | Brampton | 2011 |
| Aditours Ltd | London | 2023 |
| Aditum Group Ltd | Birmingham | 2018 |
| Adiuk | London | 2005 |
| Adiutor Specialist Materials Ltd | Worcester | 2025 |
| Adiuvo Events Ltd | Harlow | 2025 |
| ADJ Contract Services Limited | Dartford | 2017 |
| ADJ Fire and Security Limited | Warrington | 2014 |
| ADJ Flooring Limited | Gerrards Cross | 2010 |
| ADJ Heating Limited | Romford | 2003 |
| ADJ Petroleum & Construction Limited | Doncaster | 2020 |
| ADJ Protection Ltd | Cowbridge | 2021 |
| ADJ Stevenson Recovery Limited | Spean Bridge | 2020 |
| Adja Cleaning Limited | London | 2021 |
| Adjacency Recruitment Limited | Cheltenham | 2010 |
| Adjao Limited | London | 2019 |
| Adjd Business Solutions Limited | Solihull | 2019 |
| Adjessou Kahil Ltd | London | 2024 |
| Adjumako Cleaning Service Ltd | Thornton Heath | 2022 |
| Adjust Recruitment Limited | Worksop | 2024 |
| Adjusted SET Limited | Leeds | 2021 |
| Adjusting Appointments Limited | Harrogate | 2005 |
| Adjustopen Limited | Newcastle Upon Tyne | 1992 |
| Adjuvantes Employment Limited | Manchester | 2016 |
| Adjuvantes Limited | Manchester | 2013 |
| Adjuvo Ltd | Leeds | 2013 |
| ADK Car Club Ltd | Barnet | 2021 |
| ADK Financial Services Ltd | Durham City | 2020 |
| ADK Healthcare Services Ltd | Erith | 2021 |
| ADK Hire & Sales Ltd | Dorchester | 2024 |