| ADP Painting Limited | Carlisle | 2017 |
| ADP Practitioners Limited | Glasgow | 1992 |
| ADP Property Limited | Petersfield | 2001 |
| ADP Therapy Limited | Worksop | 2024 |
| Adpax Developments Ltd | Magherafelt | 1998 |
| Adplus Ltd | London | 2017 |
| Adpt Consultancy Limited | Aylesbury | 2026 |
| Adpt Marketing Limited | Kingswood, Aylesbury | 2026 |
| Adpt Social Limited | Aylesbury | 2025 |
| ADR Aesthetique Ltd | Ayr | 2022 |
| ADR Corp Ltd | Puttenham | 2023 |
| ADR Health & Beauty Ltd | Carlisle | 2020 |
| ADR International Consulting Services Limited | London | 2007 |
| ADR Mediation & Training C.I.C. | Preston | 2013 |
| ADR Pallets Limited | Shenfield | 2022 |
| ADR Trading Derby Limited | Derby | 2025 |
| ADR Valeting Ltd | Chalfont St. Giles | 2022 |
| Adrapel Ltd | London | 2018 |
| Adrenaline 2.0 Ltd | Knowlhill | 2024 |
| Adrenaline Tattoo Studio Ltd | St. Asaph | 2012 |
| Adressu Ltd | Newcastle Upon Tyne | 2019 |
| Adrian Allen Limited | Barnsley | 2014 |
| Adrian and Lucy Limited | Leeds | 2010 |
| Adrian Anstis Limited | London | 1990 |
| Adrian Bourne Limited | Loughton | 2015 |
| Adrian Business Ltd | Greenford | 2005 |
| Adrian Cleaning Ltd | London | 2020 |
| Adrian Creative Imaging Limited | London | 2003 |
| Adrian Gallimore Ltd | Warrington | 2019 |
| Adrian George Estates Limited | Radlett | 2017 |
| Adrian Goodyear Limited | Worcester | 2004 |
| Adrian Hodea Limited | Crawley | 2019 |
| Adrian J Hairdressing Ltd | Henley-On-Thames | 2024 |
| Adrian Lacatusu Ltd | London | 2023 |
| Adrian Love Hair Artistry Ltd | Dudley | 2025 |
| Adrian Marriott Limited | Leicester | 2008 |
| Adrian Moore Funerals Ltd | London | 2022 |
| Adrian Paul Sawston Limited | Cambridge | 2016 |
| Adrian Robins Upholstery Ltd | Brighton | 2003 |
| Adrian Rowe Limited | Eaton | 2000 |
| Adrian S Wood Ltd | Belper | 2017 |
| Adrian Services Bristol Ltd | Bristol | 2020 |
| Adrian Stanciu Ltd | Northampton | 2023 |
| Adrian Sutton Limited | Guildford | 2020 |
| Adrian Withill Consulting Limited | London | 2007 |
| Adriana Cojocaru Ltd | Milton Keynes | 2021 |
| Adriana Immigration Services Limited | Preston | 2017 |
| Adriananyata Ltd | Hook | 2020 |
| Adrianna Therapy Ltd | Glasgow | 2025 |
| Adriatica Ltd | Essex | 2023 |
| Adrienne LEE Transactional Analyst Limited | Southwell | 2003 |
| Adrimat Ltd | Telford | 2019 |
| Adrimun Salon Limited | Bolton | 2025 |
| Adrinai Limited | London | 2014 |
| Adrit Trading Ltd | London | 2007 |
| Adrm Ltd | Banbridge | 2022 |
| Adroc Healthcare Limited | Kettering | 2012 |
| Adroit Marketing Limited | Ruislip, | 2025 |
| Adroit Physio Ltd | Maidenhead | 2023 |
| Adroitminds Limited | Stockport | 2018 |
| Adron Services Limited | Manchester | 2018 |
| Adryan Barber Limited | Liverpool | 2025 |
| ADS Direct Marketing Limited | Formby | 2017 |
| ADS Events Limited | Glasgow | 2018 |
| ADS Executive Limited | Poole | 2023 |
| ADS Farrier Services Ltd | Southam | 2016 |
| ADS Global Services Limited | Hertfordshire | 2007 |
| ADS Group Limited | London | 2009 |
| ADS INT Limited | Kington | 2018 |
| ADS MAS Ventas Ltd | London | 2024 |
| ADS Physiotherapy Ltd | Melton Mowbray | 2022 |
| ADS Purchase & Supply Limited | Nuneaton | 2009 |
| ADS Services (Leics) Ltd | Lutterworth | 2019 |
| ADS Smart Home Limited | St Albans | 2007 |
| ADS Turkish Barber Ltd | London | 2024 |
| ADS Windows and Doors Limited | Exeter | 2009 |
| ADS4LAWYERS Ltd | Birmingham | 2020 |
| Adski Composites Ltd | Southsea | 2016 |
| Adsm Consultancy Limited | Bristol | 2013 |
| Adss Cymru (Wales) Ltd | Mountain Ash | 2018 |
| Adstock Estates Limited | Skegness | 1992 |
| Adsum Services Limited | Doncaster | 2015 |
| Adswand Limited | Exeter | 2020 |
| Adswood Road Property Ltd | Stockport | 2023 |
| ADT Capital Services Ltd | London | 2015 |
| ADT Driver Hire Ltd | Coleford | 2024 |
| ADT Electronics Limited | Rotherham | 2022 |
| ADT Fire and Security PLC | Sunbury On Thames | 1974 |
| ADT Therapy Ltd | London | 2021 |
| Adtechgrow Limited | Dagenham | 2023 |
| Adtekh Limited | Westcliff-On-Sea | 2017 |
| Adtv Services Limited | Banchory | 2008 |
| Adu's Barbers Limited | Croydon | 2020 |
| Adudaniels Ltd | Rainham | 2026 |
| Adufe Beauty and Aesthetic Lounge Ltd | London | 2025 |
| Aduk Church | Beckenham | 2018 |
| Adullam Consortium Limited | Chelmsford | 2024 |
| Adult Non-Alcoholic Beverage Association Limited | London | 2023 |
| Adult Regulation & Child Protection Coalition Limited | London | 2023 |
| Adult Social Care Law Limited | Tring | 2019 |