| Aseer Ltd | Wholesale & retail | 2026 |
| Asees Consultancy Limited | Financial services | 2019 |
| Asees K Limited Limited | Administrative & support | 2026 |
| ASF Developments Limited | Construction | 2023 |
| ASG Global Trading Ltd | Hospitality | 2025 |
| ASG223 Ltd | Wholesale & retail | 2023 |
| ASH & Ember Charcoal Ltd | Manufacturing | 2025 |
| ASH 07 Ltd | Wholesale & retail | 2023 |
| ASH Brook Fields Ltd | Arts & recreation | 2026 |
| ASH Euro Commercials Ltd | Wholesale & retail | 2025 |
| ASH Propco Ltd | Real estate | 2019 |
| ASH Property and Developments Limited | Real estate | 2024 |
| Ashakka Caribbean Takeaway Ltd | Hospitality | 2024 |
| Ashbeck Investments Limited | Real estate | 2020 |
| Ashcare (Summerfields) Ltd | Health & social care | 2017 |
| Ashcroft Capital Investments Limited | Real estate | 2019 |
| Ashcroft Components Limited | Wholesale & retail | 2015 |
| Ashcroft Funeral Services Limited | Other services | 2023 |
| Ashcroft Memorials (Rugeley) Ltd | Other services | 2023 |
| Ashe Family Funerals Ltd | Other services | 2020 |
| Ashey Enterprise Limited | Real estate | 2016 |
| Ashford Home Buyers Ltd | Real estate | 2023 |
| Ashirwaad Catering Limited | Hospitality | 2025 |
| Ashirwaad Sweets Limited | Hospitality | 2016 |
| Ashlee Homes (Supported Living) Limited | Financial services | 2022 |
| Ashlee Homes Limited | Construction | 2018 |
| Ashlee Interiors Limited | Wholesale & retail | 2016 |
| Ashley a Rentals Ltd | Real estate | 2024 |
| Ashley Barber Creative Limited | Administrative & support | 2021 |
| Ashley Electrical Wholesalers Limited | Wholesale & retail | 1986 |
| Ashley Roofing & Building Contractors Limited | Construction | 2015 |
| Ashmore Lettings & Sales Limited | Real estate | 2021 |
| Ashoca Hospitality Limited | Hospitality | 2024 |
| Ashphiri Ltd | Public administration | 2024 |
| Ashrose Homes Limited | Hospitality | 2019 |
| Asia Foods (UK) Limited | Wholesale & retail | 2013 |
| Asiah Property Limited | Real estate | 2025 |
| Asif Eyecare Limited | Wholesale & retail | 2017 |
| Asif Partners Ltd | Other services | 2015 |
| Asim Kebab House Ltd | Hospitality | 2025 |
| Asjk Properties Ltd | Real estate | 2019 |
| ASK Investments Ltd | Real estate | 2021 |
| ASK Transport Ltd | Wholesale & retail | 2011 |
| Askey Limited | Financial services | 2012 |
| Askey Precision Engineering Limited | Manufacturing | 1996 |
| ASM Cleaning Limited | Administrative & support | 2025 |
| Asm(Swat) Ltd | Health & social care | 2013 |
| Asmara Jewellery Ltd | Wholesale & retail | 2026 |
| Asme Retail Limited | Wholesale & retail | 2016 |
| Aspen Care Homes Ltd | Health & social care | 2025 |
| Aspire Assets Relocations Ltd | Real estate | 2019 |
| Aspire Funding Limited | Hospitality | 2016 |
| Aspire Homecare Service Limited | Health & social care | 2018 |
| Aspire Vehicles Limited | Wholesale & retail | 2006 |
| ASR4 Housing Group Limited | Construction | 2026 |
| ASR4 Housing Limited | Real estate | 2020 |
| ASR4 Limited | Real estate | 2021 |
| Asra Products Limited | Wholesale & retail | 2024 |
| Assemtron Ltd | Manufacturing | 2020 |
| Asset Properties Limited | Real estate | 2017 |
| Assetmatters Limited | Administrative & support | 2013 |
| Assist the Learner Driver Ltd | Education | 2020 |
| Assistive Control Limited | Professional & scientific | 2009 |
| Associated Hotels Ltd | Hospitality | 2018 |
| Association of Dance Freestyle Professionals Limited | Other services | 2025 |
| Assumption Limited | Other services | 2022 |
| Assure Design Limited | Professional & scientific | 2021 |
| Assured Letting Solutions Ltd | Construction | 2019 |
| Assured Plumbing - GAS & Electrical Limited | Construction | 2008 |
| Assured Safety Recruitment Limited | Administrative & support | 2009 |
| Astbury Contracts Limited | Construction | 2017 |
| Astbury Interiors Limited | Construction | 2010 |
| Asterix Group Limited | Construction | 2019 |
| Aston Grove Car Sales Ltd | Wholesale & retail | 2025 |
| Astra Roofing Limited | Construction | 2003 |
| Astralucis Limited | Professional & scientific | 2010 |
| Astreltious Ltd | Transport & logistics | 2024 |
| Astrid Group Holdings Limited | Professional & scientific | 2024 |
| Astrid Group Limited | Health & social care | 2013 |
| Astro Work Construction Ltd | Construction | 2020 |
| ASW Welding & Construction Services Ltd | Manufacturing | 2020 |
| Asylum Sneakers Ltd | Wholesale & retail | 2022 |
| AT Home Hearing Limited | Wholesale & retail | 2022 |
| AT Home Holistic Therapies Ltd | Health & social care | 2023 |
| AT Motor Car Limited | Wholesale & retail | 2022 |
| ATA Computing Ltd | Information & communication | 2023 |
| ATA Group Ltd | Wholesale & retail | 2015 |
| Athena Apps Limited | Information & communication | 2024 |
| Athene Access Ltd | Professional & scientific | 2026 |
| Athesham Limited | Health & social care | 2024 |
| Athex Limited | Wholesale & retail | 2024 |
| Athwal Fashions Limited | Wholesale & retail | 2003 |
| Atkins Ferrie Services Limited | Professional & scientific | 2006 |
| Atkinson Tech Hub Ltd | Wholesale & retail | 2025 |
| ATL Royalties Ltd | Financial services | 2024 |
| Atlantas Estate Ltd | Real estate | 2022 |
| Atlantic Fresh Seafoods Limited | Wholesale & retail | 2012 |
| Atlantic Rubber & Plastic Limited | Manufacturing | 1997 |
| Atlantis Secure Transport Ltd | Health & social care | 2023 |
| Atlas Seals Limited | Manufacturing | 1996 |