| Adhd in Business Ltd | Slough | 2022 |
| Adhd Ventures Ltd | London | 2026 |
| Adhd Working Ltd | Ringwood | 2024 |
| Adhd+ Support | Chelmsford | 2014 |
| Adhdaptive Ltd | Mildenhall | 2024 |
| Adhdplay Ltd | Eastbourne | 2025 |
| Adhdx Ltd | London | 2025 |
| Adheal Ltd | Marden | 2013 |
| Adherepro Ltd | Southend-On-Sea | 2025 |
| Adhesion Consultants Limited | Kidderminster | 2003 |
| Adhesive Coatings Holdings Limited | Rochdale | 2003 |
| Adhesive Labels Limited | Middlemarch Business Park | 1962 |
| Adhesives and Sealants International Limited | Coventry | 1996 |
| Adhesives Consultancy Services Ltd | Ashton-Under-Lyne | 2023 |
| Adhi Ltd | Harrow | 2009 |
| Adhi Peraman Engineering Limited | Aberdeen | 2009 |
| Adhikara Ltd | Oadby | 2019 |
| Adhikari Consulting Limited | Warrington | 2023 |
| Adhk Accountants Limited | Uxbridge | 2007 |
| Adhl Holdings Limited | Bath | 2019 |
| Adhoc Accounts Limited | Boston | 2023 |
| Adhoc Engineering Limited | Leamington Spa | 2011 |
| Adhoc Maintenance Solutions Ltd | Omagh | 2024 |
| Adhoc Media Limited | Taunton | 2003 |
| Adhooma Investments Ltd | Lichfield Staffordshire | 2017 |
| Adhoora Ltd | Barry | 2022 |
| Adhq Ltd | Borehamwood | 2024 |
| Adhr Flair UK Limited | Blackpool | 2010 |
| Adhraa Botros Ltd | Twickenham | 2014 |
| Adhwe Ltd | London | 2023 |
| Adhz Medics Ltd | London | 2024 |
| ADI & Co Accountants Limited | Slough | 2015 |
| ADI & Co Payroll Services Ltd | Watford | 2020 |
| ADI Accountancy Ltd | Clacton-On-Sea | 2018 |
| ADI Club Ltd | South Ockendon | 2024 |
| ADI Consultants Limited | Reading | 2013 |
| ADI Contracts Limited | Preston | 2010 |
| ADI Executive Coaching Ltd | Worcester Park | 2018 |
| ADI Facilities Engineering Limited | Birmingham | 2004 |
| ADI Finance 1 Limited | Hounslow | 2006 |
| ADI Finance 2 Limited | Hounslow | 2006 |
| ADI Food and Beverage Services Limited | Birmingham | 2010 |
| ADI Goodsell Consulting Ltd | Diss | 2019 |
| ADI Group Ltd | Wimborne | 2024 |
| ADI Group Services Limited | Birmingham | 2010 |
| ADI Law Ltd | London | 2025 |
| ADI Leak Solutions Ltd | Bourne End | 2024 |
| ADI Life Sciences Limited | Birmingham | 2021 |
| ADI NET Zero Limited | Birmingham | 2026 |
| ADI People Solutions Limited | Oxford | 2019 |
| ADI Pro Leak Ltd | Sheffield | 2019 |
| ADI Sivalingam Legal Consultant Limited | Milton Keynes | 2013 |
| Adi-Automotive Ltd | Nuneaton | 2024 |
| Adia Batic Collaboration Ltd | London | 2025 |
| Adia PR Ltd | Colchester | 2013 |
| Adia Thermal Ltd | London | 2022 |
| Adian Medical Advisory Limited | Banbury | 2026 |
| Adib Enterprises Ltd | London | 2020 |
| Adiboye Consulting Ltd | Chelmsford | 2014 |
| Adicci Limited | West Malling | 2019 |
| Adicia Accounting Limited | Beds | 2006 |
| Adicted Ltd | London | 2025 |
| Adie & Co Ltd | Alfold | 2009 |
| Adie & Sons (Plate Laying) Ltd | Chatham | 2002 |
| Adie Carter Limited | Syston | 2015 |
| Adie Pepperdine Ltd | Lincoln | 2014 |
| Adiel Legal Limited | Luton | 2024 |
| Adien Limited | Northampton | 1997 |
| Adience Ltd | London | 2021 |
| Adient Holding Germany Ltd | London | 2016 |
| Adient Holding UK Ltd | London | 1988 |
| Adient Properties UK Ltd | London | 2013 |
| Adify Digital Ltd | Leeds | 2025 |
| Adigma Media Ltd | London | 2026 |
| Adignity Limited | London | 2021 |
| Adigreen Ltd | Basildon | 2021 |
| Adigy Ltd | Coventry | 2025 |
| Adikan Consultancy Limited | Milltimber | 2025 |
| Adikka Consultancy Ltd | London | 2024 |
| Adikt Limited | Hassocks | 2021 |
| Adil Mukhtar Ltd | Gateshead | 2025 |
| Adil Qardasim Ltd | London | 2026 |
| Adil Syed Law Ltd | London | 2022 |
| Adil Training & Consultancy Ltd | Birmingham | 2016 |
| Adil&Nauman Limited | Luton | 2014 |
| Adilah Design Ltd | Sheffield | 2024 |
| Adilco Accountants Limited | Leeds | 2026 |
| Adimbro Sports Management Ltd | Manchester | 2019 |
| Adime Limited | Slough | 2022 |
| Adimi & Partner PLC | Wigan | 2020 |
| Adimpletio Ltd. | Belper | 2017 |
| Adin PLC | London | 2025 |
| Adina Lloyd Limited | London | 2024 |
| Adinex Support Ltd | London | 2026 |
| Adinfra UK Limited | Stanley | 2024 |
| Adinsight Ltd | Bury St. Edmunds | 2025 |
| Adintensity Limited | London | 2022 |
| Adintra Ltd. | London | 2014 |
| Adinvenio Multimedia Limited | Louth | 2004 |
| Adio Storage Limited | Livingston | 2023 |