| Avalon Care and Safety Training Ltd. | Health & social care | 2022 |
| Avalon Digital Projects Limited | Information & communication | 2021 |
| Avalon Engineers Limited | Wholesale & retail | 2025 |
| Avalon Links Ltd | Wholesale & retail | 2026 |
| Avalon Property Developments Limited | Construction | 2004 |
| Avalon Security Services Ltd | Administrative & support | 2025 |
| Avame Ltd | Professional & scientific | 2023 |
| Avametech Ltd | Information & communication | 2023 |
| Avami Ltd | Wholesale & retail | 2023 |
| Avan Constructions Ltd | Construction | 2019 |
| Avan Global Ltd | Hospitality | 2025 |
| Avan Lounge & Bar Ltd | Arts & recreation | 2022 |
| Avance Group Holdings Ltd | Financial services | 2026 |
| Avance Solutions Limited | Professional & scientific | 2026 |
| Avango Couriers Limited | Transport & logistics | 2014 |
| Avanite Limited | Information & communication | 2015 |
| Avant Cyberspace Ltd | Professional & scientific | 2024 |
| Avant Golf Limited | Wholesale & retail | 2023 |
| Avant Medics Limited | Health & social care | 2017 |
| Avant PR Ltd. | Professional & scientific | 2013 |
| Avantagon Limited | Professional & scientific | 2017 |
| Avantgarde (UK) Limited | Real estate | 2006 |
| Avantgarde Bolton Limited | Real estate | 2012 |
| Avantgarde Bradshaw Brow Ltd | Construction | 2018 |
| Avantgarde Building Contracts Ltd | Construction | 2017 |
| Avantgarde Group Limited | Construction | 2016 |
| Avantgarde Professionals Ltd | Administrative & support | 2016 |
| Avanti (UK) Limited | Construction | 1990 |
| Avanti Business Equipment Ltd. | Manufacturing | 1996 |
| Avanti Business Software Limited | Information & communication | 2020 |
| Avanti Coffee Wholesale Limited | Wholesale & retail | 2024 |
| Avanti Destinations UK Limited | Administrative & support | 2023 |
| Avanti Display Ltd | Arts & recreation | 2001 |
| Avanti Express Limited | Transport & logistics | 2007 |
| Avanti Pro Engineering Ltd | Professional & scientific | 2025 |
| Avantlu Ltd | Agriculture & fishing | 2023 |
| Avanto Ltd | Construction | 2017 |
| Avarc Electrical Contractors Ltd | Construction | 2016 |
| Avari Generals Ltd | Wholesale & retail | 2025 |
| Avari Toys Ltd | Wholesale & retail | 2025 |
| Avary Investment Limited | Professional & scientific | 2020 |
| Avat Services Limited | Professional & scientific | 2018 |
| Avatar Consultancy Limited | Administrative & support | 2023 |
| Avatar Recruitment Ltd | Information & communication | 2025 |
| Avaxter Limited | Wholesale & retail | 2023 |
| Avayla Investments Limited | Wholesale & retail | 2025 |
| AVB Developments Limited | Real estate | 2025 |
| Avcr Ltd | Administrative & support | 2024 |
| AVD Servers Limited | Information & communication | 2021 |
| Avecia Holdings Limited | Professional & scientific | 1999 |
| Avecto Ltd | Information & communication | 2008 |
| Avela Creative Ltd | Professional & scientific | 2025 |
| Aveline Tech Co., Ltd | Wholesale & retail | 2026 |
| Avellion Limited | Financial services | 2019 |
| Avena Healthcare Ltd | Health & social care | 2024 |
| Avenant Ltd | Wholesale & retail | 2021 |
| Avencia Talent Solutions Limited | Administrative & support | 2017 |
| Avendere Solutions Limited | Wholesale & retail | 2012 |
| Avenista Limited | Information & communication | 1992 |
| Avenry Ltd | Wholesale & retail | 2025 |
| Avensure Limited | Professional & scientific | 2011 |
| Avensure Peoplecloud Ltd | Extraterritorial | 2023 |
| Avent Engineering Limited | Wholesale & retail | 1985 |
| Avent Homes Ltd | Information & communication | 2024 |
| Avent Trade Ltd | Wholesale & retail | 2024 |
| Aventara Tech Ltd | Information & communication | 2025 |
| Aventis Capital Limited | Real estate | 2015 |
| Aventurin Global Ltd | Real estate | 2025 |
| Aventus Demolition Ltd | Construction | 2025 |
| Aventus Plumbing and Heating Ltd | Construction | 2025 |
| Aventus Property Investments Limited | Real estate | 2024 |
| Aventus Void Property Services Ltd | Households | 2025 |
| Avenue Accountants Limited | Professional & scientific | 2025 |
| Avenue Estates Limited | Real estate | 1998 |
| Avenue House Properties Limited | Real estate | 2013 |
| Average JOE Productions Ltd | Information & communication | 2025 |
| Average Superhuman Limited | Information & communication | 2018 |
| Averio Limited | Information & communication | 2023 |
| Avero House Limited | Wholesale & retail | 2026 |
| Averon Crafts Ltd | Wholesale & retail | 2026 |
| Averon UK Ltd | Wholesale & retail | 2025 |
| Averra Accounting & Financial Consulting Ltd | Other services | 2021 |
| Avery Brennan Ltd | Construction | 2018 |
| Avesta (Manchester) Ltd | Wholesale & retail | 2012 |
| Avexo Cleaning Group Ltd | Administrative & support | 2025 |
| AVG Heating Ltd | Construction | 2024 |
| AVI Cease Limited | Extraterritorial | 2007 |
| Avia Nails Art Limited | Other services | 2025 |
| Aviary Aviation Services Limited | Manufacturing | 2007 |
| Aviat Consulting Limited | Professional & scientific | 1998 |
| Aviation Acquisitions Limited | Professional & scientific | 2010 |
| Aviation Maintenance Support Ltd | Manufacturing | 2021 |
| Aviation Management and Services (Amas) Limited | Professional & scientific | 2010 |
| Aviation Project Management Limited | Professional & scientific | 2013 |
| Aviation Systems Limited | Information & communication | 2022 |
| AVIATOR75 Ltd | Wholesale & retail | 2017 |
| Avicenna Medicine Limited | Health & social care | 2024 |
| Avicenna Practitioners Ltd | Health & social care | 2014 |
| Avid Installations Limited | Information & communication | 2017 |
| Avid TCG Ltd | Wholesale & retail | 2026 |