| 09368040 Limited | Administrative & support | 2014 |
| 12 Sports Media Group Limited | Professional & scientific | 2019 |
| 2 G'S Real Estate Limited | Real estate | 2017 |
| 24HRS Plumbing & Heating Services Ltd | Construction | 2016 |
| 29TH Century Solutions Limited | Information & communication | 2015 |
| 3 FS Empire Ltd | Wholesale & retail | 2021 |
| 3 Ways Railway & Construction Services Limited | Construction | 2001 |
| 36 Projects Limited | Construction | 2018 |
| 38 Mill Road Management Co. Limited | Households | 2020 |
| 3D Demolition and Construction Ltd | Construction | 2024 |
| 4 Angels Foods Limited | Wholesale & retail | 2019 |
| 568 D Auto Services Ltd | Wholesale & retail | 2015 |
| A & H Food Suppliers Ltd | Wholesale & retail | 2020 |
| A - Ranks Consulting Ltd | Information & communication | 2016 |
| A B Styles & Fabrics Ltd | Wholesale & retail | 2017 |
| A Byla Services Ltd | Transport & logistics | 2025 |
| A&C Grande Ltd | Transport & logistics | 2025 |
| A&G13 Properties Limited | Real estate | 2024 |
| A&M Construct Ltd | Construction | 2024 |
| A&M Plumbing&Construct Ltd | Construction | 2025 |
| A-Maks Construction Ltd | Construction | 2016 |
| A-Vic Ltd | Construction | 2018 |
| A.Elfes Limited | Real estate | 1951 |
| A23HYM Limited | Construction | 2026 |
| A2Z Tutorials Limited | Education | 2016 |
| AA Constructions Limited | Construction | 2015 |
| AA Homebuild Ltd | Construction | 2020 |
| Aadams Corner Limited | Other services | 2025 |
| Aames Services Limited | Transport & logistics | 2022 |
| AB Smart Limit Ltd | Transport & logistics | 2018 |
| Abassido UK Ltd | Professional & scientific | 2025 |
| Abbotts Property Services Ltd | Transport & logistics | 2015 |
| ABC Events Essex Ltd | Arts & recreation | 2019 |
| Abdurehman Motors Limited | Wholesale & retail | 2024 |
| ABI Trans Ltd | Transport & logistics | 2019 |
| Abim Consultant & Investment Ltd | Information & communication | 2023 |
| Abinitio Consult Ltd | Information & communication | 2018 |
| Abiyah Ltd | Health & social care | 2022 |
| ABM Pro Limited | Construction | 2024 |
| ABS One Construction Ltd | Construction | 2026 |
| Abykun Ltd | Health & social care | 2018 |
| ACA Professional Services Ltd | Construction | 2023 |
| Academo Limited | Education | 2024 |
| ACC Albu Ltd | Construction | 2015 |
| Accounting Specialist Limited | Professional & scientific | 2013 |
| Accounting Systems Solutions Limited | Professional & scientific | 2003 |
| ACHIEDU4U Ltd | Health & social care | 2022 |
| ACL Services Ltd | Construction | 2022 |
| ACN NDT Services Ltd | Manufacturing | 2016 |
| ACP Gas&Heating Ltd | Construction | 2026 |
| Acrehill Limited | Wholesale & retail | 1984 |
| AD Multiservices Limited | Construction | 2015 |
| AD Quality Sealants Ltd | Construction | 2021 |
| Adasal Properties Ltd | Real estate | 2023 |
| Addukson Ltd | Construction | 2024 |
| Adegboyega Enterprise Limited | Health & social care | 2020 |
| Adehg Services Limited | Real estate | 2016 |
| Adhd Dynamics and Prescribing Service Ltd | Wholesale & retail | 2024 |
| Adhia Limited | Administrative & support | 2025 |
| ADI Club Ltd | Professional & scientific | 2024 |
| ADI Trans Logistics Ltd | Extraterritorial | 2019 |
| Adira Crown Advisory Ltd | Professional & scientific | 2026 |
| ADM Flooring Expert Ltd | Construction | 2019 |
| Adofcareservices Ltd | Health & social care | 2026 |
| Adokaaley Ltd | Health & social care | 2024 |
| Ados (A&S) Limited | Health & social care | 2016 |
| Adrial Limited | Health & social care | 2020 |
| Adrian Plumbing & Heating Limited | Construction | 2014 |
| Adrianfixing Limited | Construction | 2019 |
| ADT Fencing and Groundwork’S. Ltd | Professional & scientific | 2026 |
| Advance Support Services Limited | Hospitality | 2018 |
| Advanced Healthpharm Services Limited | Wholesale & retail | 2007 |
| Advantage Medic Ltd | Administrative & support | 2012 |
| AFO Resources (UK) Ltd | Administrative & support | 2016 |
| African Plate Ltd | Wholesale & retail | 2020 |
| Afrobrit Limited | Wholesale & retail | 2023 |
| AG Pizza Ltd | Hospitality | 2025 |
| Agnej World Ltd | Other services | 2015 |
| Aims Developers Ltd | Real estate | 2024 |
| Aire Food & Wine Limited | Wholesale & retail | 2017 |
| AJ Investment Management Limited | Real estate | 2011 |
| AJ Partners Ltd | Construction | 2013 |
| AJ Tank Company Ltd | Manufacturing | 2020 |
| AJD Logistic Limited | Transport & logistics | 2014 |
| AJH Photography Limited | Professional & scientific | 2025 |
| Ajoke MI Ltd | Health & social care | 2025 |
| Akonor Ltd | Hospitality | 2021 |
| AL Capital Partners Limited | Financial services | 2016 |
| Alama Healthcare Ltd | Administrative & support | 2024 |
| Alanaday Properties Limited | Real estate | 2023 |
| Alaz Properties Limited | Real estate | 2024 |
| Alco 2014 Ltd | Hospitality | 2019 |
| Alekna Construction Ltd | Construction | 2019 |
| Aleonte Ltd | Transport & logistics | 2019 |
| Alex Brick Pointing Limited | Manufacturing | 2025 |
| Alexander & Sunnerd Consulting Ltd | Real estate | 2019 |
| Alexanderalice Ltd | Real estate | 2022 |
| Alexci Dryliners Limited | Construction | 2020 |
| ALL German Motor Company Ltd | Wholesale & retail | 2018 |
| ALL Parts Trading Ltd | Wholesale & retail | 2019 |