| Acdd Transport Ltd | Transport & logistics | 2020 |
| Acde Management Ltd | Professional & scientific | 2010 |
| Ace Carpets and Flooring Limited | Construction | 2018 |
| Ace Cleaning and Support Services Ltd | Administrative & support | 2014 |
| Ace Enforcement Services Ltd | Administrative & support | 2024 |
| Ace Global Trade Ltd | Wholesale & retail | 2023 |
| Ace Infotech Solutions Ltd | Information & communication | 2022 |
| Ace International Consultants Limited | Information & communication | 2011 |
| Ace Property Rentals Limited | Real estate | 2018 |
| Ace Property Ventures Ltd | Real estate | 2023 |
| Ace Retreats Ltd | Real estate | 2024 |
| Ace Tutoring and Mentoring Ltd | Education | 2022 |
| Ace Works Construction Ltd | Construction | 2022 |
| ACE3VENTURES Ltd | Information & communication | 2025 |
| Acepent Limited | Wholesale & retail | 2025 |
| Acet Migration Services Limited | Education | 2025 |
| Achievers Healthcare Services Limited | Professional & scientific | 2023 |
| Achinix Technologies Ltd | Information & communication | 2025 |
| Achukitty Ltd | Health & social care | 2017 |
| Acidor Consulting Ltd | Professional & scientific | 2021 |
| ACL Building Skills Solutions Ltd | Other services | 2016 |
| ACL Finishing Limited | Construction | 2013 |
| ACL Group Holdings Ltd | Extraterritorial | 2016 |
| ACL Property Development Ltd | Real estate | 2016 |
| ACL Property Maintenance Ltd | Other services | 2016 |
| ACM Construction Services Ltd | Construction | 2026 |
| Acme & Co UK Ltd | Wholesale & retail | 2021 |
| ACN Jewellers Limited | Wholesale & retail | 2025 |
| Acom Solutions Ltd | Information & communication | 2010 |
| Acomply Consultancy Ltd | Professional & scientific | 2023 |
| Acorn Properties London Ltd | Real estate | 2025 |
| Acousticlean Ltd | Administrative & support | 2025 |
| Acquah Co. Limited | Information & communication | 2025 |
| Acquire Speech and Language Therapy Ltd | Health & social care | 2017 |
| Acre Road Limited | Real estate | 2021 |
| Across the Oceans Limited | Wholesale & retail | 2012 |
| Across the Pond Theatrical Management Ltd | Arts & recreation | 2025 |
| ACT Constructions Ltd | Construction | 2026 |
| Actinium Property Ltd | Real estate | 2022 |
| Actinova Limited | Wholesale & retail | 2025 |
| Action DRY Emergency Services Limited | Other services | 2003 |
| Active Contracting Services Limited | Construction | 2013 |
| Active FOX Services Ltd | Administrative & support | 2025 |
| Active K9 Ltd | Administrative & support | 2022 |
| Active Tech Ltd | Wholesale & retail | 2022 |
| Active Waste & Landscapes Ltd | Professional & scientific | 2025 |
| Activegas GB 24/7 Ltd | Construction | 2025 |
| Activfire Ltd | Public administration | 2015 |
| Actx Solutions Ltd | Administrative & support | 2022 |
| Acuity Consultancy Ltd | Professional & scientific | 2025 |
| Acumen Global Academy Ltd | Information & communication | 2017 |
| Acura Consultants Limited | Professional & scientific | 2013 |
| ACW Painting and Decorating Ltd | Construction | 2019 |
| Acxis Limited | Professional & scientific | 2012 |
| AD Astra Theatre School Limited | Education | 2013 |
| AD Leto Ltd | Wholesale & retail | 2025 |
| AD Shield Ltd | Construction | 2023 |
| ADA London Investments Ltd | Real estate | 2026 |
| Adam Brucely Certified Accountants & Tax Consultants Ltd | Professional & scientific | 2000 |
| Adam Building Cons Ltd | Construction | 2025 |
| Adam Building Ltd | Construction | 2017 |
| Adam Consultants Limited | Real estate | 2026 |
| Adam Entrepreneurs Limited | Construction | 2014 |
| Adam Food and Grill Limited | Hospitality | 2026 |
| Adam Global Services Limited | Transport & logistics | 2022 |
| Adam House Rental Ltd | Real estate | 2024 |
| Adam Painting & Decorating Ltd | Construction | 2024 |
| Adam Shipping Limited | Transport & logistics | 1981 |
| Adam Southgate General Building Ltd | Construction | 2022 |
| Adams Construction and Development Limited | Construction | 2023 |
| Adams Property Management Services Ltd | Real estate | 2026 |
| Adaptable Sustainable Solutions Ltd | Construction | 2025 |
| Adaptex Limited | Information & communication | 2022 |
| Adbim Ltd | Wholesale & retail | 2020 |
| ADC Group & Co Limited | Construction | 2020 |
| Addison Property Management Ltd | Administrative & support | 2023 |
| Addkng Ltd | Wholesale & retail | 2024 |
| Addpay Ltd | Administrative & support | 2026 |
| Addwell Epos Solutions Ltd | Administrative & support | 2016 |
| Addwell Holdings Limited | Financial services | 2024 |
| Addy Impact Ltd | Real estate | 2020 |
| ADE Contractors Ltd | Construction | 2021 |
| ADE6080 Limited | Health & social care | 2018 |
| Adelaide Holdings Ltd | Professional & scientific | 2016 |
| Adelaide Hub Ltd | Administrative & support | 2020 |
| Adeley Consultants Ltd | Health & social care | 2017 |
| Adelinaa Ltd | Other services | 2025 |
| Adem & Aron Investment Properties Ltd | Real estate | 2024 |
| Ademab Limited | Health & social care | 2023 |
| Adenike Elegbede Limited | Health & social care | 2021 |
| Adequate Business Limited | Professional & scientific | 2018 |
| Adeskitchen Catering Services Ltd | Hospitality | 2019 |
| Adexi's Services Ltd | Professional & scientific | 2019 |
| Adhoc Entertainment Ltd | Arts & recreation | 2005 |
| ADI Book Limited | Information & communication | 2024 |
| ADI Trans Curier Ltd | Transport & logistics | 2024 |
| Adifix Ltd | Construction | 2024 |
| Adil Takeaway Ltd | Hospitality | 2015 |
| Adion Contractors Ltd | Construction | 2018 |
| ADJ Heating Limited | Administrative & support | 2003 |