| Artistry Bathrooms Ltd | Construction | 2024 |
| Artix Studios Limited | Professional & scientific | 2022 |
| Arts Intelect Ltd | Wholesale & retail | 2026 |
| Arttia Creative Limited | Professional & scientific | 2016 |
| Arturo Sebastian Management Limited | Real estate | 2014 |
| Arundel (HSG) Limited | Construction | 2019 |
| Arvo Events Limited | Wholesale & retail | 2024 |
| Arvo.Tax Limited | Professional & scientific | 2023 |
| Arya CU Ltd | Wholesale & retail | 2025 |
| Aryaadam Ltd | Hospitality | 2020 |
| Aryana Halal Food Store Ltd | Wholesale & retail | 2018 |
| ARZ Motors Ltd | Wholesale & retail | 2018 |
| AS & Co Buildings Management Ltd | Administrative & support | 2019 |
| AS (Newcastle) Properties Ltd | Real estate | 2019 |
| AS Education Solutions Ltd | Education | 2003 |
| AS Hothi Holdings Ltd | Financial services | 2022 |
| AS Legal Consultants Limited | Professional & scientific | 2017 |
| AS My Family Ltd | Health & social care | 2023 |
| AS Property Developments Ltd | Real estate | 2021 |
| As-Sabaah Ltd | Administrative & support | 2025 |
| AS2 Foods Ltd | Hospitality | 2026 |
| ASA Projects Limited | Professional & scientific | 2023 |
| ASC North East Ltd | Administrative & support | 2014 |
| Ascarr Limited | Construction | 2022 |
| Ascendant Communications Consulting Holdings Ltd | Financial services | 2021 |
| Ascendex Ltd | Transport & logistics | 2024 |
| Ascendrix Services Limited | Administrative & support | 2025 |
| Ascenteur Ltd | Information & communication | 2022 |
| Ascenteur Tech Ltd | Information & communication | 2022 |
| Ascot Court (West Boldon) Limited | Real estate | 2003 |
| ASD Bathroom Services Ltd | Construction | 2020 |
| Asethair Limited | Wholesale & retail | 2013 |
| ASG Power Systems Limited | Professional & scientific | 2014 |
| Asghar Property Group Ltd | Real estate | 2025 |
| ASH (NE) Ltd | Real estate | 2026 |
| ASH and Rose Limited | Wholesale & retail | 2025 |
| ASH Building & Contractors Ltd | Construction | 2024 |
| ASH Mini Market Ltd | Wholesale & retail | 2023 |
| Ashaki Supply Ltd | Wholesale & retail | 2020 |
| Ashberry Homes Limited | Extraterritorial | 2009 |
| Ashberry Strategic Land Limited | Construction | 2015 |
| Ashbourne Interiors Ltd | Wholesale & retail | 2026 |
| Ashburton Interiors Limited | Other services | 2021 |
| Ashbury Property Management Limited | Households | 1998 |
| Ashdale Decorating Services Limited | Other services | 2001 |
| Ashdown Services West Ltd | Health & social care | 2020 |
| Ashfield Estates Limited | Real estate | 1979 |
| Ashfordino LP | | 2017 |
| Ashgill Management Company Limited | Administrative & support | 1984 |
| Ashgroup IT Ltd | Information & communication | 2015 |
| Ashin City Tours & Travels Limited | Administrative & support | 2007 |
| Ashington Removals & Storage Ltd | Transport & logistics | 2008 |
| Ashir Afzal Ltd | Wholesale & retail | 2025 |
| Ashley J. Wynne Flooring Ltd | Information & communication | 2016 |
| Ashlie & Hall Limited | Professional & scientific | 2004 |
| Ashraf House Limited | Real estate | 2023 |
| Ashton House Care Limited | Health & social care | 2010 |
| Ashton Opticians Ltd | Wholesale & retail | 2017 |
| Ashwick Developments Limited | Construction | 2012 |
| Asia Golf Breaks Ltd | Administrative & support | 2025 |
| Asian Business Connexions (ABC) Trading Limited | Information & communication | 2019 |
| Asian Business Connexions Community Interest Company | Information & communication | 2009 |
| Asian Dastarkhwan Ltd | Hospitality | 2024 |
| Asian Harvest Foods (IRE) Ltd | Hospitality | 2023 |
| Asiana Minerals Limited | Financial services | 2019 |
| Asif Ansar Foods Limited | Hospitality | 2024 |
| Asif Clinical Services Ltd | Health & social care | 2026 |
| Asif Consulting Limited | Real estate | 2013 |
| Asif K Limited | Health & social care | 2014 |
| Asil 25 Limited | Wholesale & retail | 2025 |
| Asili Creatives Limited | Wholesale & retail | 2025 |
| Asisi Ltd | Real estate | 2019 |
| Asiya Cleaning Services Limited | Administrative & support | 2023 |
| ASJ Investment and Developments Limited | Real estate | 2022 |
| ASK ABM Ltd | Real estate | 2024 |
| ASK Accountants NE Limited | Professional & scientific | 2023 |
| ASK Analysis and Test Consultancy Ltd | Professional & scientific | 2019 |
| ASK Electrical NE Limited | Manufacturing | 2018 |
| ASK Locums Limited | Administrative & support | 2019 |
| Askary and Co Limited | Financial services | 2018 |
| Askh Property Services Ltd | Real estate | 2024 |
| Askh PVT. Limited | Information & communication | 2016 |
| Askjt Ltd | Professional & scientific | 2015 |
| ASM Property Services Ltd | Construction | 2020 |
| Ason Capital Ltd | Professional & scientific | 2024 |
| Asone Healthcare Training Ltd | Professional & scientific | 2018 |
| Asowata Endrance Limited | Information & communication | 2020 |
| Aspasia Investments Limited | Real estate | 2020 |
| Aspect Healthcare Group Limited | Health & social care | 2024 |
| Aspect Healthcare Services Limited | Health & social care | 2024 |
| Aspen 183 Holdings Ltd | Financial services | 2024 |
| Aspen Developments and Consultancy Ltd | Professional & scientific | 2024 |
| Aspenwood Group Limited | Construction | 2020 |
| Aspez UK Technologies Ltd | Information & communication | 2019 |
| Aspire Group Holdings Ltd | Financial services | 2019 |
| Aspire Healthcare Limited | Health & social care | 2007 |
| Aspire Heating Supply Ltd | Construction | 2024 |
| Aspire Living Management Ltd | Real estate | 2023 |
| Aspire Midlands North Limited | Real estate | 2020 |
| Aspire North East Limited | Real estate | 2017 |