| Audrey Alexander Fashion Ltd | Manufacturing | 2018 |
| Augmentum Holdings Ltd | Real estate | 2024 |
| August London Ltd | Wholesale & retail | 2025 |
| August Pictures Ltd | Information & communication | 2022 |
| Augustia Limited | Information & communication | 2022 |
| Augustine Recruitment Limited | Administrative & support | 2025 |
| Auhan Ltd | Real estate | 2022 |
| Aujla & Dhut Properties Limited | Real estate | 2020 |
| Aujla Homes (UK) Ltd | Real estate | 2021 |
| Aujla Property Holdings Limited | Real estate | 2026 |
| AUM Electrical & Solar Solutions Ltd | Construction | 2017 |
| AUM Private Limited | Financial services | 2009 |
| AUM SAI Properties Ltd | Real estate | 2020 |
| AUM Shanti Funeral Services Limited | Other services | 2022 |
| AUM Solar Specialists Ltd | Construction | 2018 |
| Aumaxum Ltd | Construction | 2011 |
| Aumkar Sweets & Savouries Limited | Wholesale & retail | 2011 |
| Aums Organics Ltd | Wholesale & retail | 2023 |
| Aunt Norman Ltd | Arts & recreation | 2025 |
| Aura Build Limited | Wholesale & retail | 2012 |
| Aura Centre of Hair and Beauty Limited | Other services | 2011 |
| Aura Consultancy Services Ltd | Information & communication | 2011 |
| Aura Elite Care Ltd | Health & social care | 2026 |
| Aura Homes Group Ltd | Real estate | 2024 |
| Aura Hospitality Management Ltd | Hospitality | 2023 |
| Aura Infinity Limited | Real estate | 2015 |
| Aura on Stage Ltd | Arts & recreation | 2025 |
| Aura Skincare and Cosmetics Limited | Wholesale & retail | 2024 |
| AURA9 Consulting Ltd. | Information & communication | 2016 |
| Aurae Healthcare Ltd | Health & social care | 2025 |
| Auramaya Ltd | Wholesale & retail | 2020 |
| Aurastra Ltd | Wholesale & retail | 2026 |
| Aurea Tours Ltd | Administrative & support | 2025 |
| Aurelion Capital Limited | Financial services | 2018 |
| Aureum Travel Ltd | Administrative & support | 2025 |
| Aureus Development Limited | Extraterritorial | 2014 |
| Aureus Holding Company Limited | Real estate | 2018 |
| Aurevia Trading Ltd | Wholesale & retail | 2026 |
| Aurex Consulting Limited | Professional & scientific | 2026 |
| Auric Gold Ltd | Wholesale & retail | 2012 |
| Auric Insurance Services Limited | Financial services | 2011 |
| Auric Visuals Ltd | Professional & scientific | 2026 |
| Aurion Tech Ltd | Information & communication | 2023 |
| Auris Construction Ltd | Construction | 2008 |
| Aurius Holdings Limited | Financial services | 2026 |
| Aurivora Limited | Administrative & support | 2026 |
| Aurora Elite Limited | Other services | 2023 |
| Aurora International UK Ltd | Wholesale & retail | 2025 |
| Aurora Nova Sailing Ltd | Administrative & support | 2023 |
| Aurora Terrazzo Limited | Construction | 2019 |
| Aurorastack Limited | Information & communication | 2025 |
| Aurra Advisory Limited | Other services | 2026 |
| Aurrum Consulting Ltd | Professional & scientific | 2026 |
| Ausbridge Capital Investment Services Ltd | Financial services | 2021 |
| Auspicatus Limited | Real estate | 2019 |
| Auspicious Thread Ltd | Wholesale & retail | 2023 |
| Austen Communications Limited | Professional & scientific | 2020 |
| Austin Ayegbeni Ltd | Construction | 2025 |
| Australian Vintners Limited | Wholesale & retail | 2023 |
| Austrin Rentals LLP | | 2024 |
| Auto Care Harrow Ltd | Wholesale & retail | 2023 |
| Auto Couture Ltd | Wholesale & retail | 2015 |
| Auto Express (UK) Ltd | Real estate | 2009 |
| Auto Finder Group Ltd | Wholesale & retail | 2023 |
| Auto German Motors UK Ltd | Wholesale & retail | 2025 |
| Auto Repairs Centre Ltd | Wholesale & retail | 2020 |
| Auto Service Harrow Ltd | Wholesale & retail | 2020 |
| Auto Wheels Group Ltd | Information & communication | 2024 |
| Autoelite Ltd | Wholesale & retail | 2009 |
| Autoengine Ltd | Transport & logistics | 2019 |
| Autographvacations.Com Limited | Administrative & support | 2019 |
| Autohaus London Limited | Wholesale & retail | 2010 |
| Autohaus Repair Ltd | Wholesale & retail | 2021 |
| Automate Labs Ltd | Information & communication | 2024 |
| Automated Cleaning Solutions Ltd | Administrative & support | 2025 |
| Automobili Limited | Wholesale & retail | 2025 |
| Automotive & Design Components Trading Ltd | Wholesale & retail | 2025 |
| Automotive I.T Ltd | Manufacturing | 2022 |
| Autonama Ltd | Construction | 2025 |
| Autorevive Motors Limited | Wholesale & retail | 2024 |
| Autos Drive Ltd | Administrative & support | 2026 |
| Autos Hire Ltd | Wholesale & retail | 2023 |
| Autosquad Ltd | Wholesale & retail | 2024 |
| Autotec Limited | Wholesale & retail | 2010 |
| Autotrace Global Ltd | Information & communication | 2021 |
| Autotrade London Ltd | Wholesale & retail | 2012 |
| Autovalet Management Limited | Administrative & support | 2009 |
| Auxo Sport Limited | Arts & recreation | 2024 |
| AV + MH Properties Limited | Administrative & support | 2002 |
| AV Boba Limited | Wholesale & retail | 2026 |
| AV Food & Beverage Ltd | Hospitality | 2025 |
| AV Infocorp Limited | Information & communication | 2023 |
| AV Investments Limited | Real estate | 2002 |
| AV London Properties Ltd | Real estate | 2022 |
| AV Osteopath Limited | Health & social care | 2012 |
| AV Professional Services Ltd | Professional & scientific | 2016 |
| AV Supra Ltd | Hospitality | 2022 |
| AV Techman Ltd | Administrative & support | 2022 |
| AV2 Services Ltd | Transport & logistics | 2025 |
| AVA Diamond Investments Ltd | Real estate | 2017 |