| AEI Power Systems Limited | Manufacturing | 2021 |
| AEN Transport Services Limited | Transport & logistics | 2023 |
| Aeon Interface Limited | Information & communication | 2024 |
| Aequanim Limited | Information & communication | 2017 |
| Aero ASB Group Ltd | Wholesale & retail | 2026 |
| Aerocare International Limited | Transport & logistics | 2005 |
| Aerogrid Ltd | Professional & scientific | 2026 |
| Aerospace Engineering Tooling & Defence Ltd | Manufacturing | 2025 |
| Aeroworks Real Estate Limited | Real estate | 2021 |
| Aestetica Clinic Limited | Wholesale & retail | 2023 |
| Aesthetic Beauty Therapy Ltd | Other services | 2016 |
| Aesthetic Digital Dental LAB Ltd | Manufacturing | 2024 |
| Aesthetic Essence Co Ltd | Manufacturing | 2026 |
| Aesthetic HQ Ltd | Real estate | 2020 |
| Aesthetics by a 91 Ltd | Other services | 2025 |
| Aesthetics by Faiza Ltd | Other services | 2019 |
| Aesthetics Link Ltd | Wholesale & retail | 2026 |
| Aesthetismile Ltd | Wholesale & retail | 2025 |
| Aethelred Global Ltd | Wholesale & retail | 2026 |
| Aether Dynamics Ltd | Health & social care | 2024 |
| Aevista Ltd | Professional & scientific | 2025 |
| AF Bolton Food Ltd | Hospitality | 2026 |
| AF Electricians Limited | Construction | 2026 |
| AF Global Wholesale Ltd | Wholesale & retail | 2025 |
| AF Investment Holdings Limited | Real estate | 2020 |
| AF Project Services Ltd | Professional & scientific | 2010 |
| AF Property Homes Limited | Real estate | 2024 |
| AF Property Investments Limited | Education | 2020 |
| AF Property PA Limited | Real estate | 2021 |
| AF Property Refurbishments Limited | Real estate | 2020 |
| AF Social Care Limited | Health & social care | 2015 |
| AF Specialist Consultancy Limited | Professional & scientific | 2020 |
| AFA Accountants Ltd | Professional & scientific | 2022 |
| AFA Assets Management Ltd | Real estate | 2024 |
| AFA Consultants Ltd | Professional & scientific | 2021 |
| AFA Holdings Limited | Administrative & support | 2016 |
| AFB Ventures Ltd | Wholesale & retail | 2026 |
| Afbi Properties Ltd | Real estate | 2022 |
| AFC Bolton CIC | Arts & recreation | 2025 |
| Afel Building Ltd | Manufacturing | 2026 |
| Affection Care Supported Living Ltd | Health & social care | 2024 |
| Affinity 4 Design Ltd | Professional & scientific | 2020 |
| Affirm Accountancy Services Limited | Professional & scientific | 2006 |
| Affleck Golf Ltd | Wholesale & retail | 2024 |
| Affordable Accounts Limited | Professional & scientific | 2004 |
| Affordable Driveway & Patios Ltd | Construction | 2022 |
| Affordable Leaflets Limited | Administrative & support | 2010 |
| Affordable Mobiles Limited | Wholesale & retail | 2024 |
| Affordable Real Estate Ltd | Real estate | 2023 |
| AFG Law Limited | Professional & scientific | 2013 |
| AFG Recovery Transport Limited | Transport & logistics | 2026 |
| AFG Supreme Ltd | Hospitality | 2019 |
| Afghan Chai Ltd | Hospitality | 2025 |
| Afghan Chopan Brothers Ltd | Hospitality | 2019 |
| Afghan DRY Fruit Ltd | Wholesale & retail | 2024 |
| Afghan Shop Ltd | Wholesale & retail | 2019 |
| Afghani Grill Ltd | Hospitality | 2025 |
| Afha Trading Ltd | Wholesale & retail | 2025 |
| Afibs Tech Ltd | Information & communication | 2024 |
| Afinity Network Solutions Ltd | Information & communication | 2018 |
| Afiro UK Limited | Health & social care | 2008 |
| Aflah Limited | Hospitality | 2009 |
| AFM Cons Limited | Professional & scientific | 2018 |
| Afman Ltd | Wholesale & retail | 2023 |
| Afmh Limited | Financial services | 2022 |
| Afmzd Ltd | Real estate | 2023 |
| AFO Ltd | Manufacturing | 2007 |
| AFO Marketing Ltd | Manufacturing | 2003 |
| Afodisa Ltd | Health & social care | 2022 |
| Afoomoy UK Ltd | Wholesale & retail | 2025 |
| Africa Development Consortium Limited | Financial services | 2019 |
| Africa Super Stores Limited | Hospitality | 2019 |
| Africa UK Pageants & Empowerment Programmes Ltd | Other services | 2021 |
| Africonverse Limited | Administrative & support | 2023 |
| Afrik Opti Services Limited | Health & social care | 2014 |
| Afro Elite Entertainment Ltd | Arts & recreation | 2025 |
| Afro Hangout Entertainment Ltd | Professional & scientific | 2024 |
| Afro One Ltd | Wholesale & retail | 2025 |
| AFS Legal Limited | Professional & scientific | 2024 |
| Afsana Catering Services Ltd | Hospitality | 2020 |
| After Dark Bookshop Ltd | Wholesale & retail | 2023 |
| After Hours Liverpool Ltd | Hospitality | 2025 |
| Aftermarket Arbitrage Ltd | Information & communication | 2020 |
| Afuaa Limited | Wholesale & retail | 2008 |
| AFV Holdings Ltd | Manufacturing | 2024 |
| Afya Express Ltd | Real estate | 2025 |
| Afyh Telecom Ltd | Wholesale & retail | 2026 |
| Afzal Brothers Ltd | Wholesale & retail | 2017 |
| Afzal Optical Limited | Health & social care | 2008 |
| AG Cars Ltd | Wholesale & retail | 2025 |
| AG Fitness Sports UK Ltd | Wholesale & retail | 2020 |
| AG Properties NW Ltd | Real estate | 2016 |
| AG Trojan Ltd | Hospitality | 2025 |
| Ag/Cad Limited | Information & communication | 1987 |
| AGA Estate Properties Ltd | Real estate | 2025 |
| AGA Property Solutions Ltd | Real estate | 2022 |
| Agape Trading Group Limited | Financial services | 2025 |
| Agar Property Solutions Ltd | Real estate | 2024 |
| Agate Homes Limited | Real estate | 2022 |
| Agatha Ltd | Other services | 2021 |