| Aepep Technologies Limited | Professional & scientific | 2025 |
| AER Alter Energy Resources Ltd. | Wholesale & retail | 2011 |
| Aericon Ltd | Energy | 2018 |
| Aerlingstone Limited | Information & communication | 2021 |
| Aero Finance LP | | 2017 |
| Aerolink Ltd | Wholesale & retail | 2024 |
| Aeropass Ltd | Information & communication | 2025 |
| Aerosols-R-Us.Com Limited | Professional & scientific | 2000 |
| Aerospaceanalysis Limited | Professional & scientific | 2016 |
| Aesthetics by Nikita Limited | Health & social care | 2025 |
| AESTHETICS313 Limited | Health & social care | 2022 |
| Afas V Midco Limited | Financial services | 2024 |
| Afas V Debtco Limited | Financial services | 2024 |
| Affinity Legal Limited | Real estate | 2018 |
| Affinity Residential Limited | Real estate | 2024 |
| Affordable Housing Limited | Extraterritorial | 2002 |
| AFG Auto Limited | Wholesale & retail | 2009 |
| Afincorp LP | | 2017 |
| Afiya Collective Ltd | Administrative & support | 2020 |
| Africa Hearts (UK) Ltd | Education | 2015 |
| Africhearts Limited | Education | 2014 |
| Afrikar Ltd | Information & communication | 2017 |
| Afro Mart International Limited | Wholesale & retail | 2016 |
| Afro Mini Mart Ltd | Wholesale & retail | 2020 |
| Afro Send Network CIC | Education | 2026 |
| AG & Sons Transport Ltd | Transport & logistics | 2011 |
| AG Cable Jointing Limited | Construction | 2015 |
| AG Collection Limited | Administrative & support | 2025 |
| AG Design and Consultancy Ltd | Professional & scientific | 2019 |
| AG Family Business Ltd | Construction | 2026 |
| AG Golden Limited | Information & communication | 2013 |
| AG Innovation & Strategy Ltd | Professional & scientific | 2022 |
| AG MED Ltd | Health & social care | 2022 |
| AGA Calus Ltd | Health & social care | 2023 |
| Against the Grain Woodwork Ltd | Construction | 2019 |
| Agam Holdings Ltd | Real estate | 2026 |
| Agarwal Consultants Ltd | Health & social care | 2018 |
| Agate Bands Ltd | Wholesale & retail | 2026 |
| Agate PVT Ltd | Hospitality | 2021 |
| Agaues Ltd | Construction | 2017 |
| AGB Films Ltd | Information & communication | 2003 |
| Agco Finance Limited | Financial services | 1990 |
| Agcoolingservices Ltd | Construction | 2026 |
| Agecare UK Holdings Ltd | Financial services | 2022 |
| Agency People (Consultants) Limited | Professional & scientific | 2001 |
| Agene Limited | Professional & scientific | 1934 |
| Agentic EYE Ltd | Information & communication | 2024 |
| Agile Compliance Solutions Limited | Professional & scientific | 2017 |
| Agile Enterprise Solutions Ltd | Information & communication | 2007 |
| Agile IT SD Limited | Information & communication | 2009 |
| Agile Koala Ltd | Information & communication | 2020 |
| AGILE76 Ltd | Professional & scientific | 2021 |
| Agility Marketing Ltd | Professional & scientific | 2003 |
| AGL Roofing Limited | Construction | 2020 |
| Agnes Hair Care Ltd | Other services | 2020 |
| Agnostic Security Ltd | Information & communication | 2015 |
| Agonda Services Ltd | Professional & scientific | 2011 |
| Agora Developments Ltd | Construction | 2020 |
| Agora Learning Partnership | Education | 2016 |
| Agrilytix Ltd | Information & communication | 2017 |
| Agrofounds LP | | 2019 |
| Agu.Ud-Uchechukwuservices Ltd | Construction | 2017 |
| AH Property Group Limited | Real estate | 2017 |
| AH Specialist Cars Ltd | Wholesale & retail | 2023 |
| Ah-Kh Ltd | Wholesale & retail | 2025 |
| AHD Property Investments Ltd | Real estate | 2024 |
| Ahimsa Farms Limited | Agriculture & fishing | 2025 |
| AHK Food Limited | Hospitality | 2025 |
| Ahmad Moinie Enterprise Limited | Education | 2013 |
| Ahmed ALI Khan Limited | Transport & logistics | 2022 |
| Ahmed Holdings Limited | Real estate | 2019 |
| Ahmed Real Estate Limited | Real estate | 2017 |
| Ahobil Consulting Limited | Information & communication | 2011 |
| Ahobil Properties Ltd | Real estate | 2021 |
| AI Change Partners Ltd | Professional & scientific | 2023 |
| AI Evolution Consultancy Ltd | Professional & scientific | 2025 |
| AI Fire Ltd | Administrative & support | 2022 |
| AI2ALPHA Trading Ltd | Financial services | 2020 |
| AIB Transport Services Limited | Professional & scientific | 2025 |
| Aici Ltd | Wholesale & retail | 2024 |
| AID Gemeni Ltd | Wholesale & retail | 2018 |
| AIM Build Construction Ltd | Construction | 2023 |
| AIM Noremac Ltd | Information & communication | 2021 |
| Aimal Foods Limited | Hospitality | 2026 |
| Aimicor Ltd. | Information & communication | 2012 |
| Aimind Ltd | Administrative & support | 2017 |
| Aimploy Ltd | Administrative & support | 2024 |
| Aims Consulting Ltd | Professional & scientific | 2010 |
| Aims Investment Ltd | Real estate | 2016 |
| Aims Retail Limited | Wholesale & retail | 2026 |
| Aims Sales Ltd | Wholesale & retail | 2013 |
| Aimss Ltd | Information & communication | 2015 |
| Aintu Ltd | Professional & scientific | 2019 |
| Aionit Ltd | Information & communication | 2013 |
| Air & Air Ltd | Hospitality | 2022 |
| Air and Climate LP | | 2018 |
| Air Investment Group Ltd | Financial services | 2021 |
| Air Management Limited | Arts & recreation | 2006 |
| Airborn Films Limited | Arts & recreation | 2010 |
| Airborn Productions Limited | Arts & recreation | 1983 |