| AD Removal Wirral Ltd | Other services | 2024 |
| AD Serene Properties Ltd | Real estate | 2026 |
| AD Smash Burger Ltd | Hospitality | 2026 |
| AD Software Developments Ltd | Information & communication | 2024 |
| AD Vehicle Solutions Ltd | Wholesale & retail | 2025 |
| Ad-Fab Notts Limited | Manufacturing | 2003 |
| AD3 (Nottingham) Limited | Financial services | 2011 |
| AD3 Ltd | Professional & scientific | 2010 |
| ADA Design Ltd | Administrative & support | 2017 |
| Ada+Me Ltd | Health & social care | 2024 |
| Adam Abraham Ltd | Professional & scientific | 2010 |
| Adam ALI Ltd | Hospitality | 2020 |
| Adam C Amer Limited | Health & social care | 2005 |
| Adam C Estate Ltd | Real estate | 2023 |
| Adam Charlesworth Limited | Professional & scientific | 2021 |
| Adam Cotterill Limited | Financial services | 2024 |
| Adam Developments (Midlands) Limited | Construction | 1996 |
| Adam East Ltd | Administrative & support | 2017 |
| Adam East Properties Ltd | Real estate | 2018 |
| Adam Group (Holdings) Limited | Professional & scientific | 1997 |
| Adam Haulage Services Ltd | Manufacturing | 2018 |
| Adam Holdings (London) Limited | Professional & scientific | 2013 |
| Adam Investments (Nottingham) Limited | Hospitality | 2010 |
| Adam Investments London Limited | Administrative & support | 2010 |
| Adam Jack Trading Limited | Other services | 2026 |
| Adam Jake Associates Ltd | Administrative & support | 2004 |
| Adam James Limited | Real estate | 2004 |
| Adam Jason Ltd | Wholesale & retail | 2025 |
| Adam Joseph Homes Ltd | Health & social care | 2022 |
| Adam Kulpa Limited | Information & communication | 2022 |
| Adam Matthew Archer Roberts Ltd. | Information & communication | 2012 |
| Adam Matysek Limited | Transport & logistics | 2014 |
| Adam O'Rourke Limited | Information & communication | 2022 |
| Adam Pharma Services Ltd | Health & social care | 2013 |
| Adam Properties (Notts) Ltd | Real estate | 2021 |
| Adam S Pharma Services Ltd | Health & social care | 2021 |
| Adam Shooter Ltd | Information & communication | 2019 |
| Adam Smith Brickwork Limited | Construction | 2015 |
| Adam Support Ltd | Health & social care | 2017 |
| Adam Szafranek Limited | Health & social care | 2024 |
| Adam's Apple Marketing Limited | Professional & scientific | 2026 |
| Adameros Company Ltd | Transport & logistics | 2017 |
| Adamo Foods Ltd | Manufacturing | 2021 |
| Adamo Life Limited | Wholesale & retail | 2020 |
| Adams Chiropractic Limited | Health & social care | 2004 |
| Adams Deal Sourcing Ltd | Administrative & support | 2024 |
| Adams Fruit & VEG Ltd | Wholesale & retail | 2025 |
| Adaptist Ltd | Information & communication | 2025 |
| Adaptive Software Limited | Information & communication | 2004 |
| Adaptix Educational Solutions Ltd. | Wholesale & retail | 2023 |
| Adapttech Manufacturing Solutions Limited | Manufacturing | 2000 |
| Adar Property Limited | Real estate | 2003 |
| Adarify Group Limited | Information & communication | 2025 |
| Adaron Limited | Wholesale & retail | 1977 |
| Adauniversetv Ltd | Information & communication | 2023 |
| Adbrooke Developments Ltd | Construction | 2024 |
| Adbrooke Garage Conversions Limited | Construction | 2025 |
| Adbrooke Plastering Services Limited | Construction | 2018 |
| Adbrooke Rentals Limited | Real estate | 2022 |
| Adby Property Management Ltd | Real estate | 2024 |
| ADC Infrastructure Limited | Professional & scientific | 2013 |
| ADC Maintenance Ltd | Real estate | 2022 |
| Adci EOT Ltd | Extraterritorial | 2025 |
| Adco Contracting Limited | Professional & scientific | 2016 |
| Adco Engineering Limited | Professional & scientific | 2009 |
| Adcock Accounting Limited | Financial services | 2021 |
| Adcock Financial Limited | Financial services | 2001 |
| ADD Bookkeeping Ltd | Professional & scientific | 2015 |
| ADD CON Ltd | Construction | 2025 |
| ADD Oomph Ltd | Information & communication | 2014 |
| ADD Violet Scaffolding Ltd | Construction | 2022 |
| Add-Itions Accountancy Solutions Limited | Professional & scientific | 2008 |
| ADD2SAVE Ltd | Wholesale & retail | 2020 |
| Added Scientific Limited | Professional & scientific | 2014 |
| Added Time Club Ltd | Information & communication | 2024 |
| Addi Motors Ltd | Other services | 2017 |
| Addicted to Desserts Ltd | Extraterritorial | 2021 |
| Addiction to Detail Limited | Administrative & support | 2016 |
| Addiscott Farm Limited | Hospitality | 2020 |
| Addison Horsley Limited | Professional & scientific | 2017 |
| Addison Road Holdings Ltd | Financial services | 2026 |
| Addlethorpe Retreat Limited | Hospitality | 2020 |
| Addo Food Group Limited | Manufacturing | 2006 |
| Addy & Sons Ltd | Health & social care | 2018 |
| Adebolmos Limited | Administrative & support | 2025 |
| Adeel Basharat Ltd | Administrative & support | 2019 |
| Adeel Security Ltd | Administrative & support | 2025 |
| Adela Energy Ltd | Wholesale & retail | 2018 |
| Adela Trans Limited | Transport & logistics | 2023 |
| Adelanta Travel Services Limited | Administrative & support | 1989 |
| Adelante Team Ltd | Transport & logistics | 2023 |
| Adelbry IT Services Ltd | Information & communication | 2017 |
| Adele Elizabeth Aesthetics Ltd | Health & social care | 2018 |
| Adele Hook Learning Design Ltd | Professional & scientific | 2024 |
| Adelia Limited | Hospitality | 2024 |
| Adelin & Adelina Ltd | Wholesale & retail | 2022 |
| Adem Plumbing & Heating Limited | Construction | 2011 |
| Adeoli Ltd | Wholesale & retail | 2021 |
| Adept (BPT) Limited | Manufacturing | 2004 |
| Adept Conveyor Belting Midlands Ltd | Manufacturing | 2017 |