| Affordable Gardening Limited | Agriculture & fishing | 2006 |
| AFG Electrical Limited | Manufacturing | 2018 |
| AFG123 Ltd | Hospitality | 2024 |
| AFI Events Ltd | Administrative & support | 2023 |
| Afmr (Investments) Limited | Real estate | 2021 |
| Aforia Live Production Agency Ltd | Information & communication | 2025 |
| Afribiz Limited | Information & communication | 2024 |
| Africa-Uk Cargo Logistics Ltd | Transport & logistics | 2025 |
| Afrikan Village UK Ltd | Education | 2025 |
| Afriqua Limited | Agriculture & fishing | 2026 |
| Afro Gifting Ltd | Wholesale & retail | 2025 |
| Afro Smart Ltd | Other services | 2022 |
| Afro-Phloem Limited | Hospitality | 2024 |
| Afro-Ritage Inc Limited | Construction | 2025 |
| Afrobean Foods Limited | Wholesale & retail | 2026 |
| Afromax Ltd | Wholesale & retail | 2018 |
| AFS Accountancy Limited | Professional & scientific | 2025 |
| After 10 Ltd | Professional & scientific | 2014 |
| AFW Healthcare Limited | Administrative & support | 2026 |
| Afzal Global Limited | Wholesale & retail | 2026 |
| Afzalia Welfare Foundation | Other services | 2011 |
| AG 95 Brand Ltd | Wholesale & retail | 2025 |
| AG Equity Management Ltd | Real estate | 2022 |
| AG Motor Hub Ltd | Wholesale & retail | 2025 |
| AG Office Solutions Limited | Real estate | 2015 |
| AG Plumbing & Heating Services Ltd | Construction | 2023 |
| AG Tech Support Ltd | Information & communication | 2024 |
| AG Valets Ltd | Administrative & support | 2025 |
| Ag&G Fashion Limited | Wholesale & retail | 2025 |
| AG6 Limited | Other services | 2018 |
| Agape Homecare Services Limited | Administrative & support | 2023 |
| Agapo Limited | Information & communication | 2023 |
| Agathiyar Siddha Agam Ltd | Health & social care | 2020 |
| AGB Commerce Limited | Wholesale & retail | 2026 |
| AGB Property Limited | Real estate | 2021 |
| Agbedola Holdings Ltd | Professional & scientific | 2020 |
| Agbowa Ikosi Descendants in Diaspora Ltd. | Health & social care | 2022 |
| AGE Cctv Systems Limited | Professional & scientific | 2003 |
| AGE Systems Limited | Extraterritorial | 2007 |
| Agem Construction Ltd | Construction | 2024 |
| Agem Developments Ltd | Construction | 2017 |
| Agem Properties Ltd | Real estate | 2019 |
| Agentis Financial and Mortgage Solutions Limited | Financial services | 2014 |
| Agentis Specialist Finance Limited | Administrative & support | 2024 |
| Agentis Wealth Management Ltd | Administrative & support | 2021 |
| Aggd Investments Ltd | Wholesale & retail | 2022 |
| AGH Cars and Recovery Ltd | Wholesale & retail | 2026 |
| Aghera & Co Limited | Professional & scientific | 2017 |
| Agico Properties Limited | Real estate | 2022 |
| Agile Assist Limited | Information & communication | 2025 |
| Agile Care Services Limited | Administrative & support | 2017 |
| Agile Home Care Services Ltd | Health & social care | 2014 |
| Agile Innovators Limited | Professional & scientific | 2024 |
| Agims Hand Car Wash Ltd | Wholesale & retail | 2023 |
| AGK Automotive Solutions Ltd | Wholesale & retail | 2026 |
| AGM Living Ltd | Households | 2025 |
| AGN Composites Ltd | Manufacturing | 2017 |
| Agnes Services Limited | Other services | 2022 |
| Agnes&Health Ltd | Health & social care | 2024 |
| Agnik Accounting Ltd | Professional & scientific | 2016 |
| Agnik Solution Ltd | Real estate | 2020 |
| Agnik VAT Services Ltd | Professional & scientific | 2021 |
| Agnspire Care Ltd | Public administration | 2024 |
| Agora Artistry Ltd | Transport & logistics | 2025 |
| Agorinvest UK Ltd | Financial services | 2017 |
| AGP Midlands 1 Holdco Limited | Construction | 2026 |
| AGP Midlands 1 Propco Limited | Real estate | 2026 |
| Agrade Music Limited | Information & communication | 2015 |
| Agri Bale Ltd | Agriculture & fishing | 2017 |
| Agri Soil Services Limited | Other services | 2024 |
| Agricultural Engineers Association(The) | Other services | 1955 |
| Agricultural Estates Limited | Agriculture & fishing | 1946 |
| Agricultural Industries Confederation Limited | Other services | 1936 |
| Agricultural Industries Confederation Services Limited | Professional & scientific | 2003 |
| Agricultural Plant Hire Limited | Administrative & support | 1978 |
| Agrifood Partners Ltd | Professional & scientific | 2023 |
| Agrocheckout Limited | Wholesale & retail | 2025 |
| Agrogill Chemicals UK Limited | Wholesale & retail | 2012 |
| Agrology Ltd | Agriculture & fishing | 2020 |
| Agroma UK Limited | Wholesale & retail | 2025 |
| Agrundy Ltd | Professional & scientific | 2026 |
| AGS Carpentry Limited | Construction | 2006 |
| AGS Group Holdings Limited | Financial services | 2023 |
| AGT Property Management & Lettings Ltd | Real estate | 2014 |
| AH Couriers Ltd | Transport & logistics | 2022 |
| AH Infotech Limited | Information & communication | 2014 |
| AH Motor Ltd | Administrative & support | 2017 |
| AH Prestige Peterborough Limited | Wholesale & retail | 2026 |
| Ahad Traders Limited | Wholesale & retail | 2025 |
| AHD Investments Limited | Real estate | 2025 |
| AHE Solutions Limited | Wholesale & retail | 2023 |
| AHF Internet Limited | Wholesale & retail | 1980 |
| Ahmed and Lepore Ltd | Real estate | 2018 |
| Ahmed Assets Limited | Real estate | 2019 |
| Ahmed Healthcare Services Limited | Health & social care | 2019 |
| Ahmed Recovery Ltd | Transport & logistics | 2026 |
| Ahrens Property Solutions Ltd | Real estate | 2021 |
| AI Angels Limited | Administrative & support | 2023 |
| AI Autos Ltd | Wholesale & retail | 2023 |
| AI Awareness Limited | Information & communication | 2026 |