| AVH Hair Ltd | Other services | 2026 |
| Avi-Aura Advanced Aesthetics Academy Ltd | Public administration | 2026 |
| Avi-Aura Limited | Health & social care | 2023 |
| Avia Landscaping and Property Services Limited | Construction | 2023 |
| Avica Solutions Ltd | Construction | 2009 |
| Avicoms Ltd | Information & communication | 2012 |
| Avid Ventures Holdings Limited | Professional & scientific | 2024 |
| Avise Accessories Ltd | Manufacturing | 2023 |
| Avisec Ltd | Information & communication | 2020 |
| Avistar Business Solutions Limited | Professional & scientific | 2010 |
| Aviteq UK Ltd | Manufacturing | 2017 |
| AVM Healthcare Services Ltd | Health & social care | 2014 |
| AVO Management Limited | Real estate | 2019 |
| Avocado GRP Ltd | Administrative & support | 2026 |
| Avocado Outdoors Ltd | Administrative & support | 2016 |
| Avocado Tech Ltd | Information & communication | 2025 |
| Avogreen Ltd | Real estate | 2022 |
| Avon PUB Company Ltd | Hospitality | 2019 |
| Avonbirch Limited | Real estate | 1985 |
| Avondale Electrical Solutions Limited | Construction | 2019 |
| Avonholme Ltd | Real estate | 2024 |
| Avonmore Lettings LLP | | 2022 |
| Avonmore Residentials Limited | Real estate | 2022 |
| Avpp Limited | Real estate | 2021 |
| Avra Group Limited | Professional & scientific | 2018 |
| AVS Superstore Ltd | Wholesale & retail | 2020 |
| AVS UK Property Ltd | Real estate | 2025 |
| Avus Limited | Wholesale & retail | 2008 |
| Avus Metals and Plastics Ltd. | Wholesale & retail | 2001 |
| Avwings Ltd | Professional & scientific | 2014 |
| AW Aromatics Limited | Manufacturing | 2020 |
| AW Corporate Solutions Ltd | Professional & scientific | 2026 |
| AW Data Installations Limited | Information & communication | 2018 |
| AW Plant & Grab Hire Ltd | Administrative & support | 2025 |
| AW Safety 2 Limited | Professional & scientific | 2023 |
| AWA (UK) Limited | Professional & scientific | 2013 |
| AWA Aesthetics Ltd | Wholesale & retail | 2023 |
| AWA Coaching Ltd | Education | 2026 |
| AWA Properties Ltd | Real estate | 2015 |
| AWA Tree Consultants Limited | Professional & scientific | 2013 |
| Awad (Properties) Limited | Real estate | 2024 |
| Awais Properties Limited | Real estate | 2023 |
| Awan Locum Services Ltd | Health & social care | 2011 |
| Award Visual Solutions Limited | Extraterritorial | 2008 |
| Aware Training and Consultancy Ltd | Education | 2022 |
| Away From Home Serviced Accommodation Ltd | Hospitality | 2023 |
| Awbk Property Limited | Real estate | 2013 |
| AWE Energy Services Limited | Extraterritorial | 2014 |
| Awesome Healthcare Solutions Limited | Health & social care | 2014 |
| Awesome Mawsons Ltd | Health & social care | 2025 |
| Awesome Pizza Ltd | Hospitality | 2025 |
| Awesome Special Legals Limited | Professional & scientific | 2024 |
| AWH Partners Ltd | Professional & scientific | 2025 |
| AWH Projects Ltd | Professional & scientific | 2021 |
| AWL Investments Ltd | Real estate | 2018 |
| Awmedia.Marketing Ltd | Information & communication | 2022 |
| AWP Fuel Systems Ltd | Wholesale & retail | 2002 |
| Awra Kajsons Limited | Transport & logistics | 2025 |
| Awreports Limited | Health & social care | 2022 |
| Awri Ltd | Professional & scientific | 2020 |
| AWS Property Development Limited | Real estate | 2019 |
| AWV Trade Ltd | Wholesale & retail | 2025 |
| Axalanbo Limited | Wholesale & retail | 2023 |
| Axdonis Limited | Professional & scientific | 2019 |
| Axel Services Limited | Construction | 2025 |
| Axenfield Ltd | Manufacturing | 2026 |
| Axenly Ltd | Wholesale & retail | 2025 |
| Axia Commodities (UK) Limited | Transport & logistics | 2004 |
| Axiom Phoenix Ltd | Information & communication | 2019 |
| AXIOM5 Ventures Ltd | Professional & scientific | 2026 |
| Axiora (UK) Limited | Transport & logistics | 2025 |
| Axis 1 Limited | Construction | 1990 |
| Axis Architecture & Design Management Limited | Professional & scientific | 1993 |
| Axis Credit Management Limited | Financial services | 2012 |
| Axis Eyecare Ltd | Health & social care | 2022 |
| Axis Travel Ltd | Transport & logistics | 2024 |
| Axium Solutions Limited | Information & communication | 2021 |
| Axon Quant Ltd | Information & communication | 2026 |
| Axxon Scrubs Ltd | Wholesale & retail | 2025 |
| Axxonsoft UK Limited | Information & communication | 2016 |
| AY Facilities Ltd | Administrative & support | 2026 |
| AY Food Ltd | Hospitality | 2023 |
| AY Motor Sales Ltd | Wholesale & retail | 2022 |
| Ay-Marketing Ltd | Other services | 2024 |
| AYA Kebabish Ltd | Hospitality | 2023 |
| Ayaatlearning Ltd | Wholesale & retail | 2020 |
| Ayanie Ltd | Health & social care | 2025 |
| Aydeen Express Ltd | Wholesale & retail | 2023 |
| AYG Group Holdings Ltd | Financial services | 2025 |
| Ayla Transport Ltd | Transport & logistics | 2024 |
| Aylins LDT Limited | Transport & logistics | 2025 |
| AYO Hcare Limited | Health & social care | 2019 |
| Ayoade Autos Limited | Wholesale & retail | 2026 |
| Ayoks Consulting Limited | Professional & scientific | 2012 |
| Ayoks Property Limited | Real estate | 2026 |
| Ayrmer Ltd | Real estate | 2022 |
| Aytoo Properties Ltd | Real estate | 2021 |
| Aytoun Street Developments Limited | Construction | 2013 |
| Ayubs Convenience Ltd | Wholesale & retail | 2026 |
| Ayup Creative Ltd | Professional & scientific | 2023 |