| Adam Line Creative Ltd | Pinner | 2022 |
| Adam Link Ltd | Dunfermline | 2019 |
| Adam Little Boxing Ltd | Preston | 2022 |
| Adam Maca Boxing Ltd | Brighton | 2025 |
| Adam Murphy Coaching Limited | Crewe | 2022 |
| Adam Murray Limited | London | 2018 |
| Adam Music Limited | Cobham | 2019 |
| Adam Parsons Entertainment Ltd | Littlehampton | 2023 |
| Adam Paulden Enterprises Ltd | London | 2018 |
| Adam Peaty Limited | Bedford | 2014 |
| Adam Perrin Sports Agency Ltd | Epsom | 2012 |
| Adam Reavely Tennis (Art) Ltd. | Tonbridge | 2011 |
| Adam Smalley Racing & Promotions Limited | Poulton-Le-Fylde | 2016 |
| Adam Smith Stunts Ltd | Sheffield | 2019 |
| Adam Spiegel Productions Limited | London | 2007 |
| Adam Steele Limited | London | 2025 |
| Adam Sterry Racing Limited | Deeside | 2016 |
| Adam Stower Limited | Hove | 2024 |
| Adam Sutton Limited | Oxford | 2017 |
| Adam Turnbull Animation Ltd | Brighton | 2021 |
| Adam Walderman Art Ltd | Fleetwood | 2024 |
| Adam Welch Ltd | London | 2019 |
| Adam Young Studio Limited | Southwark | 2015 |
| Adam Zamoyski Limited | London | 1976 |
| Adama Entertainment Limited | London | 2018 |
| Adamglow Limited | Banstead | 1983 |
| Adamrbaker Scouting Ltd | Pontyclun | 2024 |
| Adams Picture Library Limited | Hastings | 1970 |
| Adams Portraits Ltd | Oakham | 2020 |
| Adams-Cohen Company Ltd | London | 2024 |
| Adamschofieldpt Limited | Altrincham | 2018 |
| Adapt & Overcome Coaching Ltd | Leven | 2022 |
| Adapt and Evolve Ltd | Glossop | 2025 |
| Adapt AON Ltd | Barnstaple | 2025 |
| Adapt Coaching Ltd | Manchester | 2025 |
| Adapt Design Ltd | Biggleswade | 2010 |
| Adapt Leisure Limited | Cardiff | 2021 |
| Adapt Strength Gym Limited | Edinburgh | 2023 |
| Adapt the Studio Limited | Washington | 2018 |
| Adapt Training Ltd | Liverpool | 2024 |
| Adapt-Rugby Limited | Hornchurch | 2011 |
| ADAPT7 Ltd | Newton Abbot | 2024 |
| Adaptfitness Ltd | Fareham | 2025 |
| Adaptive Challenge Ltd | Wilmslow | 2017 |
| Adaptive Fitness Ltd | Swindon | 2025 |
| Adaptive Riders Collective CIC | Callander | 2022 |
| Adaptive Sports Innovations (ASI) CIC | Rugby | 2016 |
| Adaptivemind Consultancy Limited | Hayes | 2015 |
| Adara Tattoo Collective Ltd | York | 2016 |
| Adart Advisory Ltd | Basildon | 2024 |
| Adartem Limited | New Southgate | 2011 |
| ADB (International) Ltd | London | 1992 |
| ADB Acting Limited | Edinburgh | 2022 |
| ADB Coaching Ltd | Stoke-On-Trent | 2026 |
| Adbenture Ltd. | St Neots | 2012 |
| Adbsportsgroup Limited | London | 2025 |
| Adcam Electromotive Ltd | Huddersfield | 2017 |
| Adcam TV Ltd | Salford | 2023 |
| Adcc Scotland Ltd | Alloa | 2023 |
| ADD Color UK Ltd | London | 2024 |
| ADD Motorsports Ltd | Cirencester | 2012 |
| ADD Some Lemon Limited | Nailsworth | 2020 |
| ADD Talent Network Limited | Welwyn Garden City | 2013 |
| Add-A-Tone Productions Limited | Witham | 2017 |
| Addamus Choral Programme Ltd | London | 2025 |
| Added Time Productions Limited | London | 2022 |
| Addict Angels Limited | Richmond | 2013 |
| Addict Designs Limited | Milford Haven | 2015 |
| Addicted Promotions Limited | Bangor | 2025 |
| Addiction Recovery Arts Network CIC | Wallasey | 2023 |
| Addictive Fitness Events Limited | Sutton Coldfield | 2025 |
| Addictive Fitness Limited | Sutton Coldfield | 2020 |
| Addictive Productions Ltd | Birmingham | 2021 |
| Addictive Sketcher Ltd | London | 2024 |
| Addictive Television Limited | Brighton | 1992 |
| Addictive Vibe Limited | Newton Abbot | 2006 |
| Adding Zeros Limited | London | 2018 |
| Addington Court Operations Limited | Camberley | 2019 |
| Addington Events Ltd | Buckingham | 2025 |
| Addington Palace Golf Club Limited | Croydon | 1951 |
| Addiscott Arts Academy Ltd | Port Talbot | 2024 |
| Addiscott Cheshire Ltd | Liverpool | 2026 |
| Addison Bayard Productions Limited | London | 2025 |
| Additional Needs Fitness Ltd | London | 2025 |
| Additive Music PR Ltd. | Exeter | 2016 |
| Additude Creative Limited | Belfast | 2008 |
| Addix Fitness Limited | Bridgend | 2020 |
| Addo Creative | Swansea | 2011 |
| Address: Movement for Social Change CIC | Southampton | 2023 |
| ADE Britteon Design Ltd | Herne Bay | 2015 |
| ADE Media & Technology Group Ltd | London | 2025 |
| Adebi Brit Born Bajan Ltd | London | 2022 |
| Adedoyin Oseni Ltd | Doncaster | 2024 |
| Adejamo Holdings Ltd | Milton Keynes | 2024 |
| Adekola Creative Wellbeing Ltd | Leeds | 2026 |
| Adel Community Garden CIC | Leeds | 2023 |
| Adele Harper Fitness and Wellbeing Limited | London | 2013 |
| Adele Howitt Limited | Hornsea | 2003 |
| Adele Mildred Limited | Stockbridge | 2018 |
| Adele Peters Performing Arts School Limited | Bognor Regis | 2015 |