| Adrian Dedu Ltd | Transport & logistics | 2016 |
| Adrian Transport Ltd | Transport & logistics | 2024 |
| Adroit Civil Engineering Ltd | Construction | 2019 |
| Adroit Services Limited | Construction | 2003 |
| ADS Finance Ltd | Administrative & support | 2020 |
| Advance Design Engineering Ltd | Professional & scientific | 2022 |
| Advanced Electrical Design Ltd. | Professional & scientific | 2024 |
| Advanced GAS Solutions Ltd | Construction | 2022 |
| Advanced Holdings Group Ltd | Financial services | 2024 |
| Advanced Processing Group Limited | Professional & scientific | 2021 |
| Advanced Processing Machinery Limited | Administrative & support | 2016 |
| Advanced Processing Services Limited | Wholesale & retail | 2019 |
| Advanced Products Limited | Wholesale & retail | 2009 |
| Advanced Residential Maintenance Ltd | Construction | 2024 |
| Advanced Total Supplies Ltd | Wholesale & retail | 2011 |
| Adventure Style Campers Ltd | Manufacturing | 2025 |
| Adventure Zone Soft Play Limited | Arts & recreation | 2006 |
| Advocacy Data and Intelligence Ltd | Information & communication | 2015 |
| Adytr@Ns Limited | Transport & logistics | 2018 |
| AE Branding Studio Ltd | Professional & scientific | 2021 |
| AE Signs Studio Ltd | Manufacturing | 2023 |
| AED Carpentry & Joinery Ltd | Manufacturing | 2026 |
| Aedificium Limited | Construction | 2012 |
| AEG Transport Ltd | Transport & logistics | 2012 |
| AEH Accountancy Ltd | Professional & scientific | 2005 |
| Aeon Design Limited | Wholesale & retail | 2009 |
| AEP Rugby Limited | Professional & scientific | 2021 |
| Aerial Hockey Ltd | Wholesale & retail | 2019 |
| Aero Sift Limited | Professional & scientific | 2010 |
| Aeronet Limited | Information & communication | 2011 |
| Aetheland Limited | Real estate | 2019 |
| Aetherhive Ltd | Professional & scientific | 2025 |
| Aetos Associates Limited | Financial services | 2018 |
| Aetos Management Services LLP | | 2018 |
| AFA Transport Ltd | Administrative & support | 2018 |
| AFC & Co Transport Limited | Transport & logistics | 2017 |
| Affiliated Building Contracts Limited | Construction | 1975 |
| Afflated Limited | Professional & scientific | 2014 |
| Affluent Infosoft Limited | Information & communication | 2020 |
| Africa Enterprise Trust | Other services | 1998 |
| African Choice Food Market Limited | Wholesale & retail | 2024 |
| Afromix Ltd | Health & social care | 2022 |
| AFT ENG. Limited | Professional & scientific | 2005 |
| AFT Equine Ltd | Agriculture & fishing | 2025 |
| AG (Leamington Spa) Limited | Health & social care | 2008 |
| AG Golf Limited | Wholesale & retail | 2019 |
| AG Trucking Ltd | Transport & logistics | 2023 |
| Agaares Ltd | Hospitality | 2024 |
| Agape Store Ltd | Wholesale & retail | 2023 |
| Agasthya Limited | Information & communication | 2017 |
| AGB Global Services Ltd | Information & communication | 2024 |
| Agboola Limited | Professional & scientific | 2019 |
| Agho & Pet Ltd | Transport & logistics | 2019 |
| Agilitum Ltd. | Manufacturing | 2017 |
| Agility Transport Group Limited | Transport & logistics | 2024 |
| AGS Daventry Ltd | Construction | 2025 |
| AGU Properties Ltd | Real estate | 2022 |
| AH Fitness & Coaching Limited | Health & social care | 2024 |
| Ahphrodite Limited | Transport & logistics | 2015 |
| AHT Property Business Ltd | Construction | 2025 |
| AI Physicians Limited | Health & social care | 2024 |
| AI4HEALTH Ltd | Professional & scientific | 2022 |
| Aidatrans Ltd | Transport & logistics | 2017 |
| Aims Automotive Solutions Ltd | Professional & scientific | 2021 |
| Aims Bargain Ltd | Real estate | 2018 |
| Air Power Publishing Ltd | Information & communication | 2024 |
| Aira Consulting Services Limited | Information & communication | 2025 |
| Airie Ltd | Wholesale & retail | 2010 |
| Aishani Ltd | Real estate | 2025 |
| Aisimde Ltd | Health & social care | 2025 |
| Aisimholdings Limited | Professional & scientific | 2025 |
| Aivio Ltd | Information & communication | 2025 |
| AJ Consulting IMS Ltd | Professional & scientific | 2023 |
| AJ Couriers NW Limited | Transport & logistics | 2018 |
| AJ Express Logistics Ltd | Transport & logistics | 2025 |
| AJ International Transport Ltd | Transport & logistics | 2019 |
| AJ Niner Ltd | Construction | 2015 |
| AJ Services Ltd | Agriculture & fishing | 2024 |
| AJB Marketing Group Ltd | Professional & scientific | 2024 |
| AJD Group 1 Ltd | Real estate | 2023 |
| AJD Group 2 Ltd | Real estate | 2023 |
| AJD Group 3 Ltd | Real estate | 2023 |
| Ajef Limited | Real estate | 2014 |
| AJH Transformation Landscapes Ltd | Administrative & support | 2024 |
| AJS Carpentry and Joinery Ltd | Construction | 2020 |
| AJS Holdings (2025) Ltd | Construction | 2025 |
| AJX Enterprises Ltd | Wholesale & retail | 2025 |
| AK Merchants Limited | Wholesale & retail | 2025 |
| AK2 Holdings Limited | Real estate | 2021 |
| AKC Orchard Limited | Wholesale & retail | 2024 |
| Akdag Foods Ltd | Hospitality | 2018 |
| AKH Property Group Limited | Transport & logistics | 2021 |
| Akiviv Ltd | Transport & logistics | 2014 |
| AKM Mobilez Ltd | Wholesale & retail | 2022 |
| Akmarwaha Ltd | Wholesale & retail | 2019 |
| Akos Gali Ltd | Extraterritorial | 2023 |
| Akromis Ltd | Construction | 2025 |
| AKV Property Holdings Ltd | Real estate | 2026 |
| Alaminos Limited | Real estate | 2024 |
| Alanah Properties Ltd | Real estate | 2024 |