| Adom-Ba Care Company Limited | Banbury | 2025 |
| Adomah Healthcare Limited | Enfield | 2015 |
| Adomah Ltd | Coventry | 2024 |
| Adombi Ltd | Nottingham | 2023 |
| Adomicile Care Services Limited | Watford | 2019 |
| Adomnhyira Co. Limited | Slough | 2019 |
| Adomoo Ltd | Enfield | 2018 |
| Adon Care Ltd | Liverpool | 2025 |
| Adon Health Ltd | Coventry | 2019 |
| Adon Solution Limited | Wymondham | 2023 |
| Adonai Care Ltd | Herne Bay | 2025 |
| Adonai Care Personnel Limited | Romford | 2012 |
| Adonai Childcare Limited | London | 2026 |
| Adonai Children's ARK Ltd | London | 2020 |
| Adonai Elderly Care Ltd | Bournemouth | 2024 |
| Adonai Enterprise Ltd | Kettering | 2019 |
| Adonai Health & Wellness Centre Ltd | London | 2020 |
| Adonai Health Care Limited | Newcastle Upon Tyne | 2016 |
| Adonai PVT Ltd | Dartford | 2020 |
| Adonai Solutions Ltd | Bordon | 2012 |
| Adonai TMB21 Ltd | Tipton | 2016 |
| Adonai's Haven Limited | Bolton | 2025 |
| Adonay Group Limited | Sheffield | 2023 |
| Adonaya Care Services Ltd | Southend-On-Sea | 2025 |
| Adoncocar Ltd | Cardiff | 2023 |
| Adonia Aesthetics North West Ltd | Bolton | 2020 |
| Adonia by Cake Limited | Manchester | 2021 |
| Adonis Healthcare Ltd | Taunton | 2023 |
| Adonis London Cosmetics Ltd | Ruislip | 2018 |
| Adopt a Grandparent Limited | Godalming | 2020 |
| Adopt Health Limited | London | 2020 |
| Adopt Healthcare Ltd | Leeds | 2015 |
| Adopt NI | Belfast | 2004 |
| Adopters for Adoption Limited | Bromsgrove | 2013 |
| Adoption Finder Intermediary Service Limited | Fishguard | 2020 |
| Adoption Matters | | 1982 |
| Adoption West | Trowbridge | 2018 |
| Adoptionplus | Ilford | 2009 |
| Ador Health-Care Services Ltd | Barking | 2022 |
| Adora - Health & Wellbeing Ltd | Rossendale | 2021 |
| Adora Quality Care Ltd | London | 2018 |
| Adorable Beauty T/A Serenity Beauty and Skin Therapies Ltd | Wakefield | 2020 |
| Adorable Care Ltd | Worthing | 2026 |
| Adorable Nurseries Limited | Northampton | 2015 |
| Adorable Steps Day Nursery Ltd | Manchester | 2021 |
| Adore Aesthetics and Medispa Limited | Barnsley | 2025 |
| Adore Care Group Ltd | London | 2022 |
| Adore Care Homes Ltd | London | 2022 |
| Adore Care Services Limited | Tilbury | 2016 |
| Adore Care Spennymoor Limited | London | 2023 |
| Adore Children Ltd | Exeter | 2021 |
| Adore Coaching Club Ltd | London | 2025 |
| Adore Home Care Ltd | Nelson | 2011 |
| Adore Ltd | Tipton | 2024 |
| Adore New Beginnings Ltd | Manchester | 2019 |
| Adore Wellbeing Ltd | Manchester | 2019 |
| Adore.Life Limited | Cambridge | 2016 |
| Adored Care Ltd | Blackpool | 2022 |
| Adoring Care Ltd | Milton Keynes | 2022 |
| Adormeh Excel & Care Limited | Halifax | 2021 |
| Adorn Aesthetics Ltd | Blyth | 2020 |
| Adorn Care Services Limited | Redhill | 2020 |
| Adorn Enterprises Ltd | Bedford | 2026 |
| Ados (A&S) Limited | South Ockendon | 2016 |
| Ados Sightcare Limited | Solihull | 2003 |
| Ados/Adir Clinical Consultants Limited | Wimborne | 2026 |
| ADP Care Limited | Epping | 2017 |
| ADP Dental Laboratory Ltd | Plymouth | 2003 |
| ADP Dental Limited | Leicester | 2024 |
| ADP Diagnostics Ltd | Carrickfergus | 2005 |
| ADP Occupational Health and Psychological Services Limited | Coventry | 2017 |
| ADP Primary Care Services Limited | Leeds | 2009 |
| ADP Psychological Services Limited | Canterbury | 2008 |
| ADP2 Ltd | London | 2024 |
| Adpsychotherapy Limited | Leicester | 2021 |
| ADR Aware CIC | Romford | 2026 |
| ADR Care Homes Limited | St. Neots | 2002 |
| ADR Consultancy Services Ltd | Trimdon Station | 2020 |
| ADR Divine Destiny Ltd | Birmingham | 2014 |
| ADR Medical Limited | Newton Abbot | 2018 |
| ADR Proffetixx Ltd | Middlesex | 2012 |
| Adrams Limited | Harrogate | 2014 |
| Adrenova Ltd | Preston | 2024 |
| Adri Medical Services Limited | Wakefield | 2017 |
| Adria Dental Limited | Altrincham | 2024 |
| Adria Healthcare Ltd | London | 2021 |
| Adria Oral Health Ltd | London | 2026 |
| Adrial Limited | South Ockendon | 2020 |
| Adriamed Ltd | Leicester | 2020 |
| Adrian & Peter Ltd | Mitcham/ Surrey | 2013 |
| Adrian Barnardo Ltd | Ashford | 2014 |
| Adrian Barnett Limited | Maghull | 2015 |
| Adrian Chiriac Ltd | Fishguard | 2015 |
| Adrian Edwards Clinical Psychology Limited | Waterlooville | 2025 |
| Adrian Fawcett Limited | Kingston Upon Thames | 2010 |
| Adrian Ionut Healthcare Ltd | Southampton | 2020 |
| Adrian Jennings Limited | Manchester | 2007 |
| Adrian MED Services Ltd | Luton | 2024 |
| Adrian Murray Counselling Ltd | Coventry | 2021 |
| Adrian Peter Jones Ltd | Cheltenham | 2022 |