| Asab Investment Ltd | Real estate | 2025 |
| Asad Holdings Ltd | Real estate | 2026 |
| Asaf HK Group Limited | Manufacturing | 2023 |
| Asaf HK Group Property Ltd | Real estate | 2024 |
| Asaks Homes Ltd | Real estate | 2022 |
| Asal UK Ltd | Wholesale & retail | 2006 |
| Asalewa Yoruba Center for Distance Learning Ltd | Education | 2025 |
| Asalux Ltd | Hospitality | 2025 |
| Asam Birmingham Ltd | Wholesale & retail | 2018 |
| Asana Asset Management Ltd | Transport & logistics | 2023 |
| Asana Leisure Limited | Hospitality | 2021 |
| Asantrix Ltd | Wholesale & retail | 2025 |
| Asap Aviation Limited | Transport & logistics | 2022 |
| Asap Commercial Cleaners Limited | Administrative & support | 2010 |
| Asap Express (Bristol) Limited | Transport & logistics | 2014 |
| Asap Global Limited | Transport & logistics | 2021 |
| Asap Innovations UK Limited | Manufacturing | 2020 |
| Asap Sales Limited | Transport & logistics | 2011 |
| Asap Tuning Ltd | Wholesale & retail | 2024 |
| Asap Workers Ltd | Administrative & support | 2023 |
| Asaptoday Limited | Transport & logistics | 2020 |
| Asas Care Limited | Health & social care | 2022 |
| Asase Limited | Health & social care | 2018 |
| Asatoma Ltd | Professional & scientific | 2021 |
| Asavrail Ltd | Professional & scientific | 2023 |
| Asawar’S Make Ltd | Wholesale & retail | 2020 |
| ASB Accountancy Ltd | Professional & scientific | 2021 |
| ASB Pharma WM Ltd | Administrative & support | 2024 |
| ASB Properties Limited | Real estate | 2007 |
| ASB Wedding Services Ltd | Other services | 2020 |
| Asbaab Solutions Ltd | Information & communication | 2026 |
| Asbestos Assessments Limited | Construction | 2016 |
| Asbestos Removal Near ME Ltd | Water & waste | 2025 |
| Asbk Property Group Ltd | Real estate | 2018 |
| Asbk SPV Ltd | Real estate | 2023 |
| Asbrits College UK Limited | Education | 2019 |
| Asbury Grange (Handsworth Wood) Management Company Limited | Households | 2021 |
| ASC Connections Group Limited | Professional & scientific | 2009 |
| ASC Connections Limited | Administrative & support | 2009 |
| ASC Financial Advisers Limited | Financial services | 2012 |
| ASC Housing Ltd | Hospitality | 2025 |
| ASC LLB Limited | Professional & scientific | 2015 |
| ASC Property Solutions Limited | Real estate | 2025 |
| ASC Rentals Ltd | Households | 2024 |
| ASC UK, Limited | Manufacturing | 1995 |
| ASC005A Limited | Construction | 2023 |
| Ascaso Marketing & Merchandise Limited | Wholesale & retail | 2023 |
| Ascaya Ltd | Construction | 2026 |
| Ascend Housing Limited | Hospitality | 2023 |
| Ascend Medical Limited | Wholesale & retail | 2024 |
| Ascend Medical Recruitment Limited | Administrative & support | 2019 |
| Ascend Midlands Ltd | Real estate | 2022 |
| Ascend Solutions Ltd | Professional & scientific | 2022 |
| Ascend Training Club Limited | Arts & recreation | 2026 |
| Ascend Travel Ltd | Transport & logistics | 2024 |
| Ascendant Records Ltd | Information & communication | 2026 |
| Ascendex Freight Solutions Ltd | Transport & logistics | 2025 |
| Ascendia Essentials Limited | Wholesale & retail | 2024 |
| Ascending Minds Psychology Limited | Health & social care | 2016 |
| Ascension Care Limited | Health & social care | 2023 |
| Ascent Housing and Support Limited | Administrative & support | 2025 |
| Ascent Housing Ltd | Real estate | 2025 |
| Ascent Plan Limited | Real estate | 2016 |
| Ascent Risk Solutions Limited | Professional & scientific | 2025 |
| Ascent Supported Living Ltd | Hospitality | 2023 |
| Ascent Sutton Properties Limited | Real estate | 2020 |
| Ascent Ultra Homes Limited | Construction | 2022 |
| Ascii Consultancy Ltd | Information & communication | 2014 |
| Ascio Logistics Ltd | Transport & logistics | 2025 |
| Asclepion Limited | Education | 2016 |
| Asclepius Properties Ltd | Real estate | 2016 |
| Asco Centre Limited | Wholesale & retail | 2010 |
| Asco Components Limited | Manufacturing | 2009 |
| Ascorp Enterprises Ltd | Wholesale & retail | 2022 |
| Ascot Holiday Flats Limited | Real estate | 2023 |
| Ascot Lloyd Financial Planning Limited | Financial services | 1979 |
| Ascot Lloyd Investment Management Limited | Financial services | 2012 |
| Ascot Lloyd Limited | Professional & scientific | 2011 |
| Ascot Lloyd Trustees Limited | Financial services | 2006 |
| Ascot RTM Company Limited | Real estate | 2010 |
| Ascot Villa Limited | Extraterritorial | 2014 |
| Ascott Wealth Management Limited | Professional & scientific | 2012 |
| ASD 10 Limited | Professional & scientific | 2018 |
| ASD Mobile Mechanics Ltd | Wholesale & retail | 2020 |
| ASD Motor Vehicles Ltd | Wholesale & retail | 2025 |
| ASD Security Systems Limited | Administrative & support | 2010 |
| ASDB1 Ltd | Real estate | 2025 |
| Asec Security Group Ltd | Administrative & support | 2017 |
| Asec Security Products Ltd | Administrative & support | 2015 |
| Ased Marketing Limited | Professional & scientific | 2025 |
| Aseer Time Ltd | Manufacturing | 2025 |
| Asenov Ltd | Transport & logistics | 2020 |
| Asenov.D.R.Contruction Ltd | Construction | 2026 |
| ASF Builders & Plumbers Merchant Ltd | Wholesale & retail | 2019 |
| ASF Empire Ltd | Real estate | 2025 |
| ASF Enterprises Ltd | Hospitality | 2015 |
| Asfe UK Accommodation Service Ltd | Construction | 2019 |
| ASG Locum Limited | Health & social care | 2018 |
| ASG Motors Ltd | Wholesale & retail | 2016 |
| ASG Real Estate Ltd | Real estate | 2024 |