| AVIJ77 Ltd | Health & social care | 2019 |
| Avin Property Group Ltd | Real estate | 2025 |
| Aviona Ltd | Wholesale & retail | 2020 |
| Avips Limited | Real estate | 2017 |
| Avisons Law Ltd. | Professional & scientific | 2012 |
| Avizor UK Limited | Manufacturing | 2016 |
| AVK Consultancy Ltd | Health & social care | 2018 |
| AVL Leeds Ltd | Administrative & support | 2026 |
| AVL Technologies Ltd | Information & communication | 2016 |
| AVM Couriers Ltd | Transport & logistics | 2026 |
| AVN Properties Limited | Real estate | 2012 |
| Avnr Ltd | Real estate | 2025 |
| AVO Investments Ltd | Professional & scientific | 2020 |
| Avon View Management Company Limited | Households | 2019 |
| Avondale Court (Leeds) Management Limited | Households | 1976 |
| Avondale House Limited | Health & social care | 2020 |
| Avonlynn Limited | Manufacturing | 2018 |
| Avonmouth Pharmaceutical Assets Limited | Wholesale & retail | 2020 |
| Avortis Limited | Other services | 2026 |
| Avory Media Limited | Information & communication | 2025 |
| Avou Cleaning Services Ltd | Administrative & support | 2025 |
| Avramconsulting Ltd | Information & communication | 2025 |
| Avrotowns Group Limited | | 1900 |
| Avrtr Limited | Information & communication | 2012 |
| AVS (TVM) Ltd | Hospitality | 2020 |
| AVS Construction (National) Ltd | Construction | 2023 |
| AVS Sustainability Ltd | Professional & scientific | 2021 |
| AVS UK Developments Ltd | Construction | 2020 |
| AVT Capital Ltd | Hospitality | 2024 |
| AVT MMA Ltd | Arts & recreation | 2020 |
| Avtar Building Contractors Limited | Construction | 2021 |
| AW Chemicals Limited | Wholesale & retail | 2023 |
| AW Consumer Group Ltd | Wholesale & retail | 2026 |
| AW Plant & Commercial Ltd | Manufacturing | 2022 |
| AW2 Developments Ltd | Construction | 2018 |
| AW22 Ltd | Professional & scientific | 2023 |
| AWA Tattoo Studio Ltd | Other services | 2020 |
| Awad Motors Ltd | Wholesale & retail | 2024 |
| Awaki Healthcare Ltd | Administrative & support | 2026 |
| Awan 786 (Leeds) Ltd | Real estate | 2023 |
| Awar Ltd | Extraterritorial | 2014 |
| Award Banner & Signs Limited | Professional & scientific | 2003 |
| Award Consultancy Services Ltd | Wholesale & retail | 2011 |
| AWC Industrial Cleaning Limited | Administrative & support | 2024 |
| AWC Industry Services Ltd | Professional & scientific | 2014 |
| AWC Property Services Ltd | Real estate | 2020 |
| Awdeals Ltd | Wholesale & retail | 2026 |
| AWE LAB Limited | Information & communication | 2018 |
| Awenda Limited | Wholesale & retail | 2024 |
| Awesim Creative Ltd | Professional & scientific | 2016 |
| AWF & Co. Ltd. | Health & social care | 2012 |
| AWG Insight Limited | Professional & scientific | 2015 |
| AWG Southwest Limited | Wholesale & retail | 2023 |
| Awjones Consulting Ltd | Information & communication | 2017 |
| Awoking Ltd | Health & social care | 2022 |
| AWR Investments Limited | Real estate | 2018 |
| AWT Electrical & Compliance Ltd | Information & communication | 2025 |
| Axarsky Service Ltd | Transport & logistics | 2025 |
| Axcell Consultancy Limited | Information & communication | 2020 |
| Axcess Merchant Services Limited | Financial services | 2007 |
| Axcess Payment Services Ltd | Administrative & support | 2013 |
| Axcess Payments Group Limited | Financial services | 2023 |
| AXE Atwal Ltd | Professional & scientific | 2019 |
| Axecap Limited | Real estate | 2012 |
| Axel Porter Ltd | Wholesale & retail | 2025 |
| Axeris Consulting Ltd | Professional & scientific | 2026 |
| Axia Cars Ltd | Wholesale & retail | 2024 |
| Axiom Advisory Ltd | Professional & scientific | 2026 |
| Axiom Skin Studio Ltd | Wholesale & retail | 2026 |
| Axiom Systems Ltd | Information & communication | 2023 |
| Axiom Yorkshire (Carlton Street) Limited | Real estate | 2016 |
| Axiom Yorkshire Holdings Limited | Financial services | 2015 |
| Axiom Yorkshire Limited | Real estate | 2009 |
| Axion Electrical Solutions Limited | Construction | 2025 |
| Axion Industrial Limited | Wholesale & retail | 2026 |
| Axion Trade Limited | Wholesale & retail | 2025 |
| Axionmoke Ltd | Wholesale & retail | 2025 |
| Axis Algorithms Ltd | Information & communication | 2025 |
| Axis Branding Ltd | Professional & scientific | 2026 |
| Axis Care Solutions Ltd | Administrative & support | 2020 |
| Axis Court Management Ltd | Real estate | 2019 |
| Axis Envelope Solutions Limited | Construction | 2018 |
| Axis Leeds Ltd | Administrative & support | 2017 |
| Axis Marketing Ltd | Wholesale & retail | 2024 |
| Axis Services Limited | Information & communication | 2016 |
| Axitech Group Limited | Administrative & support | 2004 |
| Axitech Limited | Administrative & support | 2004 |
| Axium Properties Limited | Real estate | 2021 |
| Axle Plant Hire Ltd | Construction | 2017 |
| Axmann-Barnes Limited | Health & social care | 2025 |
| Axol Ltd | Information & communication | 2022 |
| Axoria Ltd | Real estate | 2025 |
| Axsah Consultancy Limited | Administrative & support | 2019 |
| Axsys Partners LLP | | 2026 |
| Axtel Commercial Management Ltd | Professional & scientific | 2023 |
| Axum Bar & Restaurant Ltd | Hospitality | 2021 |
| Axxend Limited | Information & communication | 2024 |
| Axxonet Global Limited | Manufacturing | 2014 |
| Axzel Search Limited | Administrative & support | 2024 |
| AY Healthcare Ltd | Health & social care | 2019 |