| ARU Technologies Limited | Information & communication | 2025 |
| Aruba Hairdressers Limited | Other services | 2003 |
| Arundale Care Limited | Health & social care | 2023 |
| Arvea Ltd | Professional & scientific | 2024 |
| Arvo Sales Limited | Real estate | 1970 |
| ARW Concrete Floors Ltd | Administrative & support | 2019 |
| ARX Club Ltd | Professional & scientific | 2024 |
| Arya Developments Limited | Real estate | 2018 |
| Arya Property Consultants Limited | Professional & scientific | 2024 |
| AS Solutioneers Limited | Professional & scientific | 2018 |
| AS Strategy Consulting Limited | Professional & scientific | 2018 |
| AS Sunrise Properties Ltd | Real estate | 2024 |
| AS the Crow Flies Consulting Ltd | Information & communication | 2014 |
| AS33 Limited | Professional & scientific | 2023 |
| ASA Associates Limited | Professional & scientific | 2019 |
| ASA Bricks Limited | Real estate | 2021 |
| ASC IT Solutions Limited | Information & communication | 2010 |
| Ascend Performance Materials European Limited | Manufacturing | 2018 |
| Ascha Limited | Wholesale & retail | 2024 |
| Ascot Court Management Company Limited | Households | 1990 |
| Ascott Building Services Ltd | Construction | 2018 |
| Asden Limited | Extraterritorial | 1987 |
| ASH Grove AGM Ltd | Real estate | 2022 |
| Ash&Cha Ltd | Real estate | 2022 |
| Asha Foods Ltd | Wholesale & retail | 2026 |
| Ashbell Limited | Health & social care | 2024 |
| Ashby Engineering Solutions Limited | Professional & scientific | 2018 |
| Ashehadeh Limited | Health & social care | 2021 |
| Asher Design Services Limited | Professional & scientific | 2018 |
| Ashh Properties Ltd | Real estate | 2016 |
| Ashiira Ltd | Hospitality | 2023 |
| Ashind Consulting Limited | Administrative & support | 2018 |
| Ashizee Ltd | Information & communication | 2023 |
| Ashley Bank (Hale) Management Company Limited | Households | 2001 |
| Ashley Cleaning Supplies Limited | Wholesale & retail | 2014 |
| Ashley Drinks Limited | Hospitality | 2018 |
| Ashley Fletcher Properties Limited | Real estate | 2017 |
| Ashley Foods Limited | Hospitality | 2019 |
| Ashley Grange (Northenden) Management Company Limited | Households | 2003 |
| Ashley James Consulting Limited | Administrative & support | 2014 |
| Ashley Motor Group Ltd | Wholesale & retail | 2025 |
| Ashley Plant Hire and Reclamation Limited | Water & waste | 2002 |
| Ashley Road Residents Company Limited | Households | 2004 |
| Ashley Road Tandoori Ltd | Hospitality | 2019 |
| Ashley Road Villas Management Company Ltd | Households | 2025 |
| Ashley Shipping and Trading Limited | Other services | 2019 |
| Ashtec Solutions Ltd | Information & communication | 2017 |
| Ashton Burkinshaw Limited | Real estate | 1996 |
| Ashwood Consultants Limited | Information & communication | 2021 |
| Ashwood Finance Limited | Financial services | 2025 |
| Ashworth Commercial Spaces Ltd | Real estate | 2025 |
| Ashyan Limited | Real estate | 2020 |
| Asian University for Women Foundation (Bangladesh) | Education | 2011 |
| ASK Digital Marketing Ltd | Administrative & support | 2018 |
| ASK Enterprise Limited | Wholesale & retail | 2023 |
| ASK EPM Ltd | Information & communication | 2012 |
| Askander Contracts Ltd | Professional & scientific | 2010 |
| Askmytechguy Limited | Professional & scientific | 2024 |
| Askrose Ltd | Professional & scientific | 2022 |
| Asli Kebab House Limited | Hospitality | 2020 |
| Asma Valli Dental Ltd | Health & social care | 2024 |
| Asmaanova Limited | Professional & scientific | 2024 |
| ASP Coaching Ltd | Education | 2024 |
| Aspen Accounting Ltd | Information & communication | 2015 |
| Aspen DCS Limited | Professional & scientific | 2012 |
| Aspen Engineering Limited | Professional & scientific | 2025 |
| Aspen Tower Propco 3 Ltd | Real estate | 2019 |
| Aspens (Gatley) Management Company Limited | Households | 1992 |
| Aspirem Healthcare Limited | Health & social care | 2011 |
| Aspirez Limited | Wholesale & retail | 2013 |
| Aspirez Properties Limited | Real estate | 2025 |
| Asprm Limited | Administrative & support | 2018 |
| ASR Optical Limited | Health & social care | 2012 |
| Assac Global Ltd | Wholesale & retail | 2022 |
| Asset and Vehicle Finance Limited | Construction | 2020 |
| Asset Pro Services Ltd | Construction | 2025 |
| Asset Protect Ltd | Information & communication | 2023 |
| Association for Accredited Learning CIC | Education | 2017 |
| Association of International Credit Directors & Professionals | Administrative & support | 2017 |
| Association of Port Health Authorities | Professional & scientific | 1989 |
| Assura (AHI) Limited | Administrative & support | 1998 |
| Assura (GHC) Ltd | Construction | 1996 |
| Assura (Haven Health) Limited | Professional & scientific | 2015 |
| Assura (SC 1) Ltd | Real estate | 2002 |
| Assura (SC 2) Limited | Real estate | 2000 |
| Assura Aspire Limited | Real estate | 2015 |
| Assura Aspire UK Limited | Real estate | 2015 |
| Assura Banbury Limited | Administrative & support | 2008 |
| Assura Capital Projects Development Limited | Real estate | 2001 |
| Assura CS Limited | Extraterritorial | 2010 |
| Assura Cvsk Limited | Extraterritorial | 2011 |
| Assura Development Hub Limited | Real estate | 2006 |
| Assura Financing PLC | Financial services | 2016 |
| Assura HC Limited | Real estate | 2014 |
| Assura HC UK Limited | Real estate | 2014 |
| Assura Health Investments Limited | Real estate | 2010 |
| Assura IH Limited | Financial services | 2015 |
| Assura Investments Limited | Real estate | 2003 |
| Assura Limited | Financial services | 2014 |
| Assura Management Services Limited | Other services | 2007 |