| 08443328 Limited | Construction | 2013 |
| 1 Barnehurst (Management) Limited | Households | 1991 |
| 1-2-1 Fitness & Nutrition Limited | Arts & recreation | 2002 |
| 121 Resourcing Limited | Extraterritorial | 2025 |
| 13TEN Ltd | Extraterritorial | 2012 |
| 1404 Restaurant Ltd | Hospitality | 2020 |
| 15 Brookdene Road RTM Company Limited | Real estate | 2014 |
| 1510 Solutions Limited | Professional & scientific | 2025 |
| 1ST Choice Landscaping & Paving Ltd | Administrative & support | 2025 |
| 1ST Step Properties Limited | Hospitality | 2025 |
| 234 Riverdale Road (Freehold) Limited | Households | 2017 |
| 24/7 Healthcare Services London Limited | Health & social care | 2015 |
| 24/7 Lift Services Ltd | Manufacturing | 2023 |
| 2Y2 Trading (UK) Limited | Wholesale & retail | 2010 |
| 300 Group Art Ltd | Transport & logistics | 2026 |
| 39 Woodland Road Freehold Company Limited | Real estate | 2015 |
| 3D Pest Patrol Ltd | Other services | 2025 |
| 3DSTARSPEL Limited | Health & social care | 2024 |
| 3E'S Properties Ltd | Real estate | 2019 |
| 3M Properties Limited | Real estate | 2023 |
| 3WYZE Limited | Administrative & support | 2025 |
| 4ADEX Ltd | Transport & logistics | 2016 |
| 4TEES Ltd | Real estate | 2018 |
| 57 Degrees Ltd | Wholesale & retail | 2021 |
| 5RIVERS Barnstaple Limited | Arts & recreation | 2025 |
| 5RIVERS Larne Ltd | Arts & recreation | 2025 |
| 678 Consult Limited | Professional & scientific | 2012 |
| 6IX Managed Solutions Ltd | Professional & scientific | 2019 |
| 77KCD Logistic Ltd | Transport & logistics | 2022 |
| 86 SFC in the Diaspora | Other services | 2020 |
| A & J Plant Hire (Southern) Limited | Wholesale & retail | 2007 |
| A & L Property Maintenance Ltd | Construction | 2020 |
| A J Construction (UK) Ltd | Construction | 2005 |
| A Star Cosmetics Products Ltd | Wholesale & retail | 2026 |
| A Stay Above the Rest Ltd | Hospitality | 2021 |
| A&K Brothers Automotive Ltd | Wholesale & retail | 2019 |
| A-Touch Professional CIC | Health & social care | 2024 |
| A.D. Associates Limited | Wholesale & retail | 1991 |
| A.H.S James Property Investment Limited | Real estate | 2021 |
| A.M.M GAS Heating & Services Ltd | Energy | 2024 |
| A.T.J. Electrical Services Ltd | Construction | 2019 |
| A.U Moulding Limited | Manufacturing | 2026 |
| A1 Dairy Ltd | Wholesale & retail | 2012 |
| A1 Driver Services Limited | Transport & logistics | 2016 |
| A1 Football Coaching Ltd | Arts & recreation | 2020 |
| A1 Surfaces Ltd | Construction | 2019 |
| A1M Training Ltd | Education | 2019 |
| A2Z Auto Ltd | Wholesale & retail | 2017 |
| A2Z Curlcare Ltd | Other services | 2023 |
| A3 Guarding Ltd | Administrative & support | 2009 |
| AA Production Services Ltd | Construction | 2025 |
| AA Wellbeing & Care Ltd | Education | 2025 |
| AAA Estates & Associate Limited | Public administration | 2023 |
| Aaha Limited | Information & communication | 2009 |
| AB Global Venture Limited | Real estate | 2022 |
| ABA Petroleum Development Limited | Mining & quarrying | 2010 |
| Abantu Healthcare Agency Ltd | Health & social care | 2015 |
| Abbie Limited | Professional & scientific | 2014 |
| Abdm Freight Services Ltd | Transport & logistics | 2026 |
| Abdm Solutions Ltd | Wholesale & retail | 2019 |
| Abdul K N S Limited | Construction | 2025 |
| Abedan Properties Limited | Real estate | 2024 |
| Abeezaa Ltd | Wholesale & retail | 2025 |
| Abeke Foods UK Ltd | Other services | 2010 |
| Abekjoe Ltd | Information & communication | 2015 |
| Abhi Fancy Store Ltd | Wholesale & retail | 2025 |
| Abidan Resource Limited | Health & social care | 2015 |
| Abiel Recruitment Ltd | Administrative & support | 2018 |
| Aboh Consulting Limited | Professional & scientific | 2012 |
| Abor Homes Limited | Real estate | 2019 |
| Absolute Spraying and Decorating Ltd | Construction | 2020 |
| Abula Express Limited | Hospitality | 2025 |
| Abula Special Limited | Hospitality | 2023 |
| Abutos UK Limited | Administrative & support | 2017 |
| Academic Achievers Academy Ltd | Education | 2026 |
| Academy for MRI Safety Limited | Education | 2023 |
| Academy of Dreamz Ltd | Arts & recreation | 2025 |
| Access Group Ltd | Administrative & support | 2017 |
| Accountant DR Ltd | Professional & scientific | 2012 |
| Accountants (DR) Ltd | Professional & scientific | 2011 |
| Accrediting & Assessment Bureau for Post Secondaryschools Limited | Education | 2009 |
| Ace Marketing Consultants Limited | Professional & scientific | 2014 |
| Ace of Base Clubs Ltd | Arts & recreation | 2023 |
| Ace of Base Tennis Ltd | Arts & recreation | 2023 |
| Aceolution U.K Limited | Information & communication | 2023 |
| ACM Mechanical Ltd | Construction | 2022 |
| Acorn to Oak Business Finance Limited | Financial services | 2020 |
| Acs-Fm Limited | Administrative & support | 2013 |
| Actin Limited | Construction | 2017 |
| Action Roadways Limited | Transport & logistics | 1981 |
| Active Horizons Organisation Ltd | Education | 2025 |
| Acute Ventures Ltd | Real estate | 2003 |
| AD Fosher Holding Limited | Financial services | 2025 |
| AD Unify Investment Ltd | Transport & logistics | 2018 |
| Adaora Gold Limited | Other services | 2019 |
| ADB Carpentry Services Ltd | Manufacturing | 2026 |
| Adbrian Ltd | Other services | 2020 |
| ADE Omole Consulting Limited | Information & communication | 2023 |
| Adelaidey Limited | Administrative & support | 2021 |
| Adeo Estates Property Consultants Limited | Real estate | 2023 |