| Accord Affairs Ltd | Professional & scientific | 2026 |
| Accord Services Limited | Professional & scientific | 2018 |
| Accountancy AID International Limited | Professional & scientific | 1977 |
| Accountanova Limited | Professional & scientific | 2020 |
| Accountants Without Borders Limited | Administrative & support | 2004 |
| Accounts Fortress Limited | Professional & scientific | 2016 |
| Accountsmaster Limited | Professional & scientific | 2003 |
| Accoya Residential Ltd | Professional & scientific | 2021 |
| Acctim Limited | Professional & scientific | 1999 |
| Ace Agile Consulting Limited | Other services | 2023 |
| Ace Funding Ltd | Administrative & support | 2026 |
| Acekube Limited | Information & communication | 2022 |
| Acertia Limited | Administrative & support | 2013 |
| Aces Essentials Ltd | Wholesale & retail | 2023 |
| Aces Workwear Ltd | Manufacturing | 2018 |
| Achillesv Ltd | Information & communication | 2026 |
| Acis Underwriting Agencies Limited | Financial services | 2003 |
| Acme Joinery Limited | Construction | 2010 |
| Acorn Paving & Landscaping Ltd | Administrative & support | 2012 |
| Acoustic Kids Ltd | Education | 2025 |
| Acros Capital Management Limited | Financial services | 2024 |
| ACT of GOD Ltd | Information & communication | 2023 |
| Action Equity Ltd | Professional & scientific | 2014 |
| Active Life Community Wellbeing CIC | Health & social care | 2026 |
| Acuherbs & Spa UK Limited | Health & social care | 2018 |
| Acuity Consulting Ltd | Professional & scientific | 2014 |
| Acumen Business Partners LLP | | 2013 |
| ACW Investments Ltd | Real estate | 2024 |
| ACX Express Limited | Transport & logistics | 2014 |
| Ac\Dc Jointing Ltd | Administrative & support | 2014 |
| AD Optimal Solutions Ltd | Other services | 2024 |
| AD Property Build Ltd | Construction | 2022 |
| Adaline Recruitment Limited | Administrative & support | 2022 |
| Adam Fisher Sound Design Ltd | Arts & recreation | 2023 |
| Adam James Hairdressing Limited | Other services | 2012 |
| ADC Property Consultants Limited | Construction | 2015 |
| Addai Property Group Ltd | Real estate | 2025 |
| Addington Road (Selsdon) Property Management Ltd. | Households | 2015 |
| Addison Group Assets Ltd | Financial services | 2024 |
| Addison Road Maisonettes Limited | Professional & scientific | 1994 |
| Addlhome Property Management Limited | Real estate | 2025 |
| Adhara Consulting Limited | Professional & scientific | 2012 |
| Adhd School Limited | Education | 2026 |
| Adhder Ltd | Health & social care | 2026 |
| Adiki Ventures Ltd | Real estate | 2018 |
| Adil Corp Ltd | Hospitality | 2025 |
| Adithya Enterprises Limited | Hospitality | 2009 |
| Adiva Accountancy Ltd | Extraterritorial | 2018 |
| Adiva Accountants Ltd | Professional & scientific | 2015 |
| ADJ Surgical Limited | Health & social care | 2015 |
| ADL Door Services Ltd | Construction | 2010 |
| Administrative and Professional Services Ltd | Administrative & support | 2023 |
| Admire Diamonds Ltd | Manufacturing | 2021 |
| Adnana Trans Ltd | Transport & logistics | 2020 |
| Adrians Electrical Ltd | Construction | 2017 |
| Adroit Property Holdings Ltd | Real estate | 2025 |
| ADS Interpreting Limited | Professional & scientific | 2006 |
| Adsmore Ltd | Construction | 2021 |
| Adstravs Ltd | Information & communication | 2025 |
| Adunni Group Limited | Hospitality | 2025 |
| Advance Civils Limited | Construction | 2026 |
| Advance Hashtag Limited | Information & communication | 2015 |
| Advanced Aerial Mapping Services Ltd. | Administrative & support | 2016 |
| Advanced Buildings and Maintenance Ltd | Construction | 2023 |
| Advanced Eco Vision Ltd | Construction | 2023 |
| Advanced Engineering Modelling Solutions Ltd | Professional & scientific | 2012 |
| Advanced Equity Ltd | Financial services | 2023 |
| Advanced Legal and Consultancy Services Limited | Professional & scientific | 2021 |
| Advanced Property Ltd | Real estate | 2018 |
| Advanced Rocket Technologies Ltd | Manufacturing | 2022 |
| Advanced Web Concepts Limited | Information & communication | 2006 |
| Advertise With VIC Limited | Professional & scientific | 2025 |
| Advocacy First | Health & social care | 1998 |
| Adwm (2025) Ltd | Financial services | 2025 |
| ADY Limited | Administrative & support | 2005 |
| ADZ Home-Front Services Ltd | Construction | 2023 |
| AE Construction Limited | Construction | 2016 |
| Aegis Security Solutions Ltd | Construction | 2016 |
| AES & Tharmini Limited | Hospitality | 2024 |
| Aesthetic Store Ltd | Wholesale & retail | 2026 |
| Aesthetics by Lauren Turner Ltd | Health & social care | 2018 |
| Aestiva Clinic Ltd | Health & social care | 2023 |
| Aeternum Fine Art Ltd | Wholesale & retail | 2023 |
| Aeternus Holding Ltd | Financial services | 2025 |
| Aetheria Creations Ltd | Professional & scientific | 2024 |
| AFA Waste Clearance Ltd | Water & waste | 2024 |
| AFC Shortlands Limited | Arts & recreation | 2023 |
| AFD Multimedia Limited | Other services | 2004 |
| Afficient Construction and Design Limited | Construction | 2006 |
| Affinity Trading Ltd | Wholesale & retail | 2020 |
| Affordable Accounting Solutions Ltd | Professional & scientific | 2024 |
| Affordable Moves & Transport Ltd | Transport & logistics | 2018 |
| Afitha Travels Limited | Administrative & support | 2025 |
| Africa Sky Logistics Limited | Transport & logistics | 2017 |
| African Insect Protein PTY. Limited | Wholesale & retail | 2019 |
| African Stalls Limited | Other services | 2019 |
| Afro Couture Designs London Ltd. | Manufacturing | 2016 |
| Afro Grow Global Ltd | Wholesale & retail | 2026 |
| Afro-Nibble Ltd | Hospitality | 2020 |
| Afrobite Eats & Catering UK Ltd | Hospitality | 2024 |