| Artifex Studios Limited | Arts & recreation | 2011 |
| Artisan Coatings & Exteriors Ltd | Construction | 2023 |
| Artisan Creative Agency Limited | Professional & scientific | 1996 |
| Artizan Carpentry& Joinery Limited | Manufacturing | 2017 |
| Arts Melbourne C.I.C. | Other services | 2007 |
| Arts-Insight | Education | 2009 |
| Artser Ltd | Wholesale & retail | 2025 |
| Arvia Commercial Ltd | Real estate | 2025 |
| Arvvy Transport Limited | Transport & logistics | 2024 |
| Arvéy Paris Limited | Wholesale & retail | 2025 |
| ARW Electronic Solutions Limited | Information & communication | 1997 |
| Aryan Building Ltd | Manufacturing | 2023 |
| Aryan Transportation Limited | Transport & logistics | 2026 |
| ARZ Motorwerks Ltd | Wholesale & retail | 2026 |
| AS & JK Investments Ltd | Real estate | 2018 |
| AS & YM Catering Ltd | Hospitality | 2022 |
| AS Beauty Academy Ltd | Other services | 2024 |
| AS Derby Properties Limited | Real estate | 2022 |
| AS Derby Restaurants Ltd | Hospitality | 2024 |
| AS MEP Ltd | Construction | 2026 |
| AS Movement LAB Ltd | Arts & recreation | 2022 |
| AS Thai Properties Ltd | Real estate | 2022 |
| AS13 AAA Limited | Administrative & support | 2023 |
| Asad Naqvi Limited | Financial services | 2024 |
| Asante Nimo Finishers Ltd | Construction | 2025 |
| Asap (Midlands) Limited | Construction | 2004 |
| Asar Business Ltd | Hospitality | 2018 |
| Asaro Systems Limited | Information & communication | 2009 |
| ASB Premium Limited | Education | 2026 |
| Ascendant Business Consulting Limited | Professional & scientific | 2026 |
| Ascended Accomadation Ltd. | Real estate | 2025 |
| Ascendit Training Limited | Education | 2025 |
| Ascendra Limited | Financial services | 2025 |
| Ascentant (Ripley) Limited | Professional & scientific | 2023 |
| Ascentant Limited | Professional & scientific | 2016 |
| Ascot Kitchens Derby Limited | Wholesale & retail | 2024 |
| Ascot Vehicle Breakers Ltd | Water & waste | 2016 |
| Ascot Vehicle Range Ltd | Wholesale & retail | 2023 |
| Ascotflavours Limited | Hospitality | 2024 |
| Ascott Financial Direction Ltd | Professional & scientific | 2025 |
| Ascott Transport Limited | Transport & logistics | 1959 |
| ASE Tech Ltd | Information & communication | 2024 |
| Asecos Limited | Wholesale & retail | 2004 |
| Asevi Systimata Ltd | Professional & scientific | 2023 |
| ASG Haulage Ltd | Transport & logistics | 2025 |
| ASG Holdco Limited | Financial services | 2024 |
| ASG Properties Derby Ltd | Real estate | 2024 |
| Asghar Investments Group Ltd | Real estate | 2025 |
| Asghar Property Holdings Limited | Real estate | 2024 |
| Asgs Services Ltd | Administrative & support | 2023 |
| ASH 130 Limited | Extraterritorial | 2010 |
| ASH 134 Limited | Professional & scientific | 2011 |
| ASH 144 Limited | Extraterritorial | 2012 |
| ASH 146 Limited | Extraterritorial | 2012 |
| ASH 162 Limited | Financial services | 2016 |
| ASH 169 Limited | Extraterritorial | 2017 |
| ASH 170 Limited | Financial services | 2017 |
| ASH Grill Ltd | Hospitality | 2024 |
| ASH Housing (Sussex) 2022 Limited | Health & social care | 2022 |
| ASH Housing (Sussex) LLP | | 2021 |
| ASH Locum Ltd | Health & social care | 2025 |
| ASH Propertys Holding UK Ltd | Real estate | 2024 |
| ASH Solar Farm Limited | Energy | 2021 |
| ASH Stanley Studios Ltd | Information & communication | 2024 |
| Ashbourne Building Consultancy Ltd | Construction | 2018 |
| Ashbourne Building Maintenance Co. Ltd | Extraterritorial | 2016 |
| Ashbourne Business Management Limited | Professional & scientific | 2003 |
| Ashbourne Court Management Company Limited | Real estate | 1984 |
| Ashbourne Enterprises Ltd | Transport & logistics | 2016 |
| Ashbourne Escapes Limited | Hospitality | 2023 |
| Ashbourne Physiotherapy & Sports Injuries Clinic Limited | Health & social care | 2010 |
| Ashbourne Road Lettings Ltd | Real estate | 2003 |
| Ashbourne Self Catering Holdings Limited | Financial services | 2023 |
| Ashbourne Self Storage Ltd | Other services | 2013 |
| Ashbourne Windows Limited | Extraterritorial | 2012 |
| Ashburner Clinic Limited | Health & social care | 2014 |
| Ashby Chiropody / Podiatry Clinic Ltd | Health & social care | 2006 |
| Ashby Digital Limited | Professional & scientific | 2021 |
| Ashby Electrical Solutions Ltd | Construction | 2025 |
| Ashby Interiors Limited | Wholesale & retail | 2014 |
| Ashdale Fencing Ltd | Administrative & support | 2021 |
| Asheware Limited | Information & communication | 1999 |
| Ashfen Windows and Doors Ltd | Manufacturing | 2021 |
| Ashfield Valeting Supplies Ltd | Other services | 2018 |
| Ashfield Vehicle Solutions Limited | Manufacturing | 2016 |
| Ashford Fairmont Ltd | Professional & scientific | 2024 |
| Ashford House (Derby) Management Company Limited | Households | 2007 |
| Ashiana Express Limited | Hospitality | 2025 |
| Ashiana Shisha Lounge Limited | Hospitality | 2025 |
| Ashland New Homes Ltd | Construction | 2015 |
| Ashland Property Investments Ltd | Real estate | 2024 |
| Ashley 126 Ltd | Construction | 2018 |
| Ashley Spencer Limited | Real estate | 2010 |
| Ashley Spencer Properties Limited | Real estate | 2010 |
| Ashley TED Limited | Other services | 2026 |
| Ashlie Craft Limited | Wholesale & retail | 2005 |
| Ashmalico Limited | Professional & scientific | 2017 |
| Ashmead Investments Limited | Financial services | 2013 |
| Ashmore Consultants Limited | Information & communication | 2016 |
| Ashover Engineering Limited | Manufacturing | 2005 |