| Adea Solutions Ltd | Hornchurch | 2023 |
| Adedayo Akinbowale Ltd | Plymouth | 2024 |
| Adelik Healthcare Ltd | Liss | 2019 |
| Adept Physiotherapy and Healthcare Limited | Flitwick | 2015 |
| Aderopo Limited | Orpington | 2025 |
| Adesquare Care Ltd | Rotherham | 2019 |
| Adesquare Healthcare Ltd | Milton Keynes | 2022 |
| Adeyemi Holdings Limited | Dartford | 2025 |
| ADG Mindcare Ltd | Woodford Green | 2021 |
| Adhd Babes CIC | London | 2020 |
| Adhd Connections Ltd | Durham | 2025 |
| Adhd Insight Ltd | London | 2026 |
| Adima Group Ltd | Taunton | 2003 |
| Aditi Safety Training Ltd | Tamworth | 2017 |
| Adjuva Care Services Ltd | Cleckheaton | 2025 |
| Adkin Consultancy Limited | St Albans | 2007 |
| ADL Care Services Limited | Witham | 2022 |
| ADM Services (UK) Ltd | York | 2005 |
| ADM1N Consultancy Services Limited | Blackpool | 2026 |
| Admin Assassin Ltd | Hinckley | 2019 |
| Admin Bookings Ltd | Southall | 2024 |
| Admin KK Ltd | London | 2021 |
| Admin Shrub Limited | Mildenhall | 2025 |
| Admin Walkers Limited | Westlea | 2024 |
| Adminjim Ltd | Preston | 2026 |
| Adminverse Ltd | Manchester | 2025 |
| Admirable Care Services Ltd | London | 2026 |
| Adom Organisation Ltd | Watford | 2025 |
| Adorn Care Ltd | London | 2022 |
| ADP Compliance Ltd | Orpington | 2024 |
| ADR Mediation Ltd | Leicester | 2025 |
| Adrian Burrell Limited | Cardiff | 2019 |
| Adrian Security Ltd | Edgware | 2017 |
| Adriana Health Ltd | Lichfield | 2018 |
| Adsam Healthcare Ltd | Chelmsford | 2023 |
| Adsb Consulting Limited | York | 2019 |
| Adshaq Ltd | Mansfield | 2022 |
| Adstatus Limited | Warminster | 2015 |
| Advacure Limited | Leeds | 2020 |
| Advance Fire Protection Ltd | Lincoln | 2025 |
| Advance Practitioner Limited | Colchester | 2026 |
| Advanced Canine Technologies Limited | Dover | 2012 |
| Advanced Care and Support Ltd | Manchester | 2025 |
| Advanced DRY Risers Ltd | Maidstone | 2025 |
| Advanced Fire Protection (Rochdale) Ltd | Rochdale | 2016 |
| Advanced Fire Protection (South West) Limited | Saltash | 2008 |
| Advanced Fire Risk Limited | Washington | 2026 |
| Advanced JET Training Limited | London | 2008 |
| Advanced Sprinkler Installations Ltd | Glasgow | 2025 |
| Advantage Africa | Olney | 2002 |
| Adventure Hyndburn Ltd | Accrington | 2002 |
| Advice and Guidance Project Ltd | Nottingham | 2021 |
| Advicegeek Ltd | London | 2020 |
| Adviza Partnership | London | 2008 |
| ADW Advisory Services Ltd. | Mildenhall | 2024 |
| AE Clinical Consulting Limited | London | 2025 |
| AEA Locums Limited | New Malden | 2020 |
| Aefrs Ltd | Lewes | 2017 |
| Aefs Services Limited | Wickford | 2023 |
| Aegis Data Protection Consulting Limited | Bishop'S Stortford | 2025 |
| Aegis Fire Safety Ltd | Swansea | 2026 |
| AEK Ultrasound Ltd | Shipley | 2026 |
| Aern Anakwenze Ltd | Southampton Hampshire | 2022 |
| Aero and Defence Solutions Limited | Caterham | 2013 |
| Aerodrome Safety Assessment Partnership Ltd | South Croydon | 2026 |
| Aeronautx Ltd | Melton Mowbray | 2015 |
| Aerynn Elizabeth Limited | London | 2025 |
| Aesop Therapy Ltd | Huddersfield | 2026 |
| Aether Healthcare Ltd | Canvey Island | 2024 |
| AF Fire Compliance Ltd | Gosport | 2026 |
| AF Safety Consultancy Ltd | Barnoldswick | 2026 |
| AF Site Services Limited | Warrington | 2014 |
| Afbk Ltd | Southampton | 2025 |
| AFD Inspections Limited | Waltham Cross | 2022 |
| Affection Health Care Ltd | Romford | 2019 |
| Affinity Capital Works Limited | Sleaford | 2015 |
| Affinity Childrens Home Ltd | Oldham | 2023 |
| Affinity Flying Services Limited | Sleaford | 2015 |
| Affinity Flying Training Services Limited | Sleaford | 2015 |
| Affinity Security Services Limited | Chelmsford | 2017 |
| Affordable Fire Systems Ltd | Wolverhampton | 2022 |
| Afghanistan Peace and Justice Supporters Organisation (Apjso) CIC | Harrow | 2024 |
| Afiyah Healthcare Ltd | Wembley | 2021 |
| AFL Associates Limited | Cirencester | 2019 |
| Aflex Security Limited | Gravesend | 2017 |
| Afon Healthcare Ltd | Bristol | 2023 |
| AFP General Solutions UK Ltd | St. Ives | 2017 |
| African and Minority Families Support Services (Afrifass) CIC | Oldbury | 2023 |
| African Beacon Centre | Doncaster | 2025 |
| African Caribbean Autism Family Support Group CIC | Abingdon | 2025 |
| African Durbar and Business Expo (Midlands) CIC | Coventry | 2024 |
| African Forum for Restorative Justice CIC | Leicester | 2010 |
| AFS Dorset Ltd | Poole | 2026 |
| AFT Consultants Limited | Nottingham | 2021 |
| Aftaw Ltd | Reading | 2018 |
| Afwrae Ltd | London | 2025 |
| Afya Diet Ltd | Dagenham | 2024 |
| Afybuk Care Limited | Heath Farm | 2021 |
| AG Empire Limited | London | 2015 |
| AG Fire Protection Ltd | Slough | 2026 |