| Adhd and ME CIC | Warrington | 2023 |
| Adhd Bristol Collective CIC | Bristol | 2026 |
| Adhd Coaching With Anna Ltd | Bicester | 2025 |
| Adhd Coaching With Rachel Ltd | Dumbarton | 2024 |
| Adhd Family CIC | Westgate-On-Sea | 2025 |
| Adhd Foundation | Droitwich | 2005 |
| Adhd School Limited | Bromley | 2026 |
| Adhd Scotland Limited | Larbert | 2022 |
| Adhd Support Bedford CIC | Wixams | 2025 |
| Adhd Support Services CIC | Liverpool | 2024 |
| Adhd Transitions Ltd | Maidstone | 2024 |
| Adhd Works Limited | Farnborough | 2022 |
| Adhd+ Services Ltd | Chelmsford | 2014 |
| Adhdifferent Path Coaching Limited | Spilsby | 2026 |
| Adhdlounge Ltd | Liverpool | 2024 |
| Adhdsmart Neurodiversity C.I.C. | Ashford | 2025 |
| Adhisthana Trust | Ledbury | 2011 |
| Adhyapak Ltd | Aylesbury | 2025 |
| ADI Driving Instructor Limited | Bristol | 2019 |
| ADI Network Limited | Salford | 2023 |
| ADI School of Motoring Ltd | Leicester | 2024 |
| Adi&Lizy Ltd Ltd | London | 2025 |
| Adibnia Ltd | Hitchin | 2025 |
| Adicus Education CIC | Liverpool | 2025 |
| Adikeih CIC | Birmingham | 2026 |
| Adil Abdullah Ltd | London | 2025 |
| Adil Khalid Ltd | Wolverhampton | 2026 |
| Adinne Ltd | Cardiff | 2025 |
| Adirose Learning Limited | Rainham | 2026 |
| Adiuvisti Limited | Houghton Le Spring | 2025 |
| ADJ First AID Training, Glasgow Ltd | Johnstone | 2020 |
| Adjube Limited | Warrington | 2017 |
| Adjust Training and Consultancy Ltd | London | 2016 |
| ADK Driving School Ltd | Wembley | 2025 |
| ADL Online Limited | Bedford | 2011 |
| Adler Training Services Ltd | Sheffield | 2026 |
| Adlington Community Nursery | Trafford Park | 2008 |
| Adlis Driving School Ltd | Gosport | 2023 |
| Adlr Training Ltd | Cardiff | 2020 |
| ADM Driving Ltd | Liverpool | 2024 |
| ADM Plant Training Ltd | Newport | 2026 |
| ADM Shine Training Limited | Coalville | 2015 |
| ADM Training & Consultancy Ltd | South Shields | 2017 |
| Admac Rail Training Limited | London | 2023 |
| Admac Services Limited | London | 2021 |
| Admiral Agency Limited | Shrewsbury | 2018 |
| Admiral Sports Academy CIC | Liverpool | 2024 |
| Admission Assistant Limited | London | 2020 |
| Admission Group Ltd | London | 2023 |
| Admission Help Ltd | Manchester | 2020 |
| Admission Link Ltd | London | 2017 |
| Admission Masters LC Ltd | London | 2025 |
| Admission Network Ltd | London | 2020 |
| Admission Support Centre Ltd | London | 2026 |
| Admission Support Worldwide Ltd | Bilston | 2022 |
| Admissions International Limited | Hayes | 2019 |
| Admissions Services Ltd | London | 2020 |
| Admissions Solutions Limited | King'S Lynn | 2023 |
| Admissions Unlocked Ltd | Essex | 2025 |
| Admit IT Consulting Ltd | London | 2025 |
| Admitra Limited | London | 2016 |
| Admore Training and Consultancy Limited | London | 2004 |
| ADN (Northampton) Limited | Coventry | 2005 |
| Adnan & Sons Ltd | Glasgow | 2020 |
| Adniti Ltd | London | 2020 |
| ADO Services CIC | Welling | 2009 |
| Adoi Ltd | Falmouth | 2026 |
| Adolescence Support and Educational Services Limited | Seaton | 2014 |
| Adolescent Care and Therapy Training Ltd | Blackpool | 2026 |
| Adolescent Wellbeing CIC | Birmingham | 2024 |
| Adonai Global Services Limited | Glasgow | 2025 |
| Adopt-A-Monument Limited | Dalkeith | 2015 |
| Ador Suppliers Ltd | London | 2017 |
| Adora Foundation Ltd | Nottingham | 2012 |
| Adorable Angels Limited | London | 2015 |
| Adorable Childcare Nursery Ltd. | Dagenham | 2021 |
| Adorable Steps Childcare Limited | Manchester | 2018 |
| Adorables Day Nursery Ltd | Northampton | 2010 |
| Adore Dance Ltd | London | 2021 |
| Adore Training Centre Limited | Nelson | 2019 |
| Adore Your Pelvic Floor Limited | Essex | 2016 |
| Adot Foundation | London | 2014 |
| Adowa Dancers UK CIC | Grays | 2024 |
| ADP Education Support Services Ltd | Chippenham | 2026 |
| ADP Enterprises Ltd | Birmingham | 2022 |
| ADP Lancaster Ltd | Wallsend | 2023 |
| ADP Training Ltd | Twickenham | 2017 |
| Adprivacy Ltd | London | 2024 |
| ADR Training Ltd | Lichfield | 2025 |
| Adreamz International Limited | Southall | 2025 |
| Adregis Investments Limited | Stockton-On-Tees | 2011 |
| Adrenaline Sports C.I.C. | Waltham Cross | 2018 |
| Adrian Miotti Ltd | London | 2026 |
| Adrian Young Swimming Limited | Westgate-On-Sea | 2022 |
| Adrianne Reid Educational Psychology Ltd | Bristol | 2022 |
| Adrienne Jones Limited | London | 2003 |
| Adriven Ltd | Glasgow | 2023 |
| Adroit Tuition Ltd | Manchester | 2023 |
| Adroit-E Monitor Limited | Oakham | 2008 |
| ADS AIM Driving School Limited | Greenford | 2026 |