| AS Seen on Tele Ltd | Administrative & support | 2017 |
| AS Tyres Bay Ltd | Wholesale & retail | 2024 |
| AS Venture Capital Partners Limited | Financial services | 2025 |
| ASA UK Consulting Ltd | Administrative & support | 2020 |
| Asad & Adil Investments Ltd | Real estate | 2014 |
| Asad Consulting Ltd | Financial services | 2019 |
| Asad Hafeez Ltd | Health & social care | 2017 |
| Asad Hussain Property Limited | Real estate | 2019 |
| Asad Khan 2000 Ltd | Transport & logistics | 2025 |
| Asad Mahmood Limited | Transport & logistics | 2022 |
| Asad Tasleem Consultants Limited | Administrative & support | 2017 |
| Asads Care Ltd | Wholesale & retail | 2025 |
| Asanteman Nkabom KUO Ltd | Education | 2023 |
| ASB Travel Services Ltd | Transport & logistics | 2021 |
| Ascalon Services Ltd | Professional & scientific | 2024 |
| Ascendia Accountants Limited | Professional & scientific | 2024 |
| Ascent Estates Limited | Real estate | 2017 |
| Ascent Holdings Ltd | Real estate | 2016 |
| Ascent Living Ltd | Real estate | 2023 |
| Ascent Management Group Ltd | Financial services | 2020 |
| Ascent Real Estate Limited | Administrative & support | 2020 |
| Ascent Residentials Ltd | Real estate | 2021 |
| Ascent Safety & Compliance Management Ltd | Professional & scientific | 2025 |
| Ascent Vehicles Limited | Wholesale & retail | 2018 |
| Ascentis Management Ltd | Other services | 2024 |
| Ascentys Ltd | Information & communication | 2017 |
| Ascot Road Watford Limited | Construction | 2011 |
| ASD Joinery & Flooring Ltd | Construction | 2026 |
| ASD Logistic Ltd | Transport & logistics | 2023 |
| ASE Environmental Ltd | Construction | 2018 |
| ASF Events Ltd | Real estate | 2019 |
| Asfr Limited | Health & social care | 2017 |
| Asfs Commercial Limited | Administrative & support | 2024 |
| Asfs Group Limited | Financial services | 2024 |
| Asfs Properties Limited | Real estate | 2022 |
| Asgard Storage Limited | Extraterritorial | 2005 |
| Asghar & Sons Limited | Construction | 2014 |
| Asgts Ltd | Information & communication | 2026 |
| ASH & Iron Ltd | Wholesale & retail | 2026 |
| ASH & Raja Holdings Limited | Professional & scientific | 2015 |
| ASH by SAM Ltd | Manufacturing | 2025 |
| ASH Legal Consultant Ltd | Professional & scientific | 2018 |
| ASH Medical Ltd | Health & social care | 2025 |
| ASH Plumbing & Heating Contractors Ltd | Construction | 2021 |
| ASH Spice Ltd | Hospitality | 2017 |
| ASH Yorkshire Community Interest Company | Health & social care | 2013 |
| Ash's Place Ltd | Education | 2019 |
| Ash-Shifarx Ltd | Health & social care | 2026 |
| Asha Superstore Ltd | Wholesale & retail | 2025 |
| Ashar Locum Limited | Health & social care | 2012 |
| Ashbourne Holdings Limited | Financial services | 2018 |
| Ashburnham Grove Management Company Limited | Households | 1981 |
| Ashbycare Limited | Health & social care | 2015 |
| Ashcroft Online Limited | Health & social care | 2024 |
| Ashcroft Pharma Limited | Professional & scientific | 2015 |
| Ashfield Piggeries Ltd | Agriculture & fishing | 2011 |
| Ashford Homes (Leeds) Limited | Real estate | 2007 |
| Ashgrove BD Limited | Other services | 2025 |
| Ashgrove Solutions Ltd | Real estate | 2025 |
| Ashington Cars and Commercials Limited | Wholesale & retail | 2006 |
| Ashlar Capital Group Limited | Financial services | 2026 |
| Ashlee Group Ltd | Construction | 2025 |
| Ashley Cooke's Home Furniture Limited | Wholesale & retail | 2023 |
| Ashley Kinnock Limited | Wholesale & retail | 2017 |
| Ashmore Furniture Limited | Wholesale & retail | 2013 |
| Ashmount Group Ltd | Real estate | 2020 |
| Ashraf Property Group Ltd | Real estate | 2026 |
| Ashton Property Maintenance Ltd | Construction | 2012 |
| Ashtree Maintenance Limited | Agriculture & fishing | 2022 |
| Ashtree Vision & Safety Limited | Manufacturing | 1982 |
| Ashtroope Sports Limited | Professional & scientific | 2025 |
| Ashville Care Limited | Health & social care | 2003 |
| Ashwell Health and Beauty Limited | Health & social care | 2024 |
| Ashwell Road Management Company Limited | Households | 1982 |
| Ashwells Law LLP | | 2012 |
| Ashwood Taverns Limited | Hospitality | 2014 |
| Ashwood Tree Care Ltd | Administrative & support | 2023 |
| Asia Southfield Limited | Wholesale & retail | 2025 |
| Asia Superstore Limited | Wholesale & retail | 2022 |
| Asian Sports Foundation Ltd | Other services | 2017 |
| Asianbrands Limited | Wholesale & retail | 2025 |
| Asif I Care Ltd | Wholesale & retail | 2021 |
| Asim Foods Limited | Manufacturing | 2021 |
| Asim Holding Ltd | Real estate | 2022 |
| Asim Pharma Limited | Health & social care | 2017 |
| Asim Roofing Ltd | Construction | 2019 |
| Asim Saleem Consulting Ltd | Financial services | 2012 |
| ASIM381 Limited | Wholesale & retail | 2026 |
| Asimak Ltd | Hospitality | 2024 |
| Asin Enterprises Ltd | Construction | 2014 |
| ASJ Express Limited | Transport & logistics | 2018 |
| ASK Chauffeurs Limited | Transport & logistics | 2025 |
| ASK Health Group Ltd | Health & social care | 2026 |
| ASK Logistics Limited | Transport & logistics | 2025 |
| Askbiggy Community Interest Company | Administrative & support | 2025 |
| Aslam Enterprise Ltd | Wholesale & retail | 2026 |
| Aslam Investments Ltd | Real estate | 2016 |
| Aslams Carpets Ltd | Construction | 2023 |
| Aslams Flooring Ltd | Wholesale & retail | 2011 |
| Asli Health Limited | Wholesale & retail | 2023 |