| Ashridge Vehicles Limited | Wholesale & retail | 2005 |
| Ashton Pride Limited | Administrative & support | 2003 |
| Ashton SPW Limited | Hospitality | 2019 |
| Ashton Tools Limited | Extraterritorial | 2016 |
| Ashwarohi Limited | Real estate | 2024 |
| Ashwarth Consulting Limited | Wholesale & retail | 2022 |
| Ashwill Engineering Limited | Extraterritorial | 2012 |
| ASI Cars Limited | Wholesale & retail | 2019 |
| ASI Trucking Limited | Transport & logistics | 2025 |
| Asia Catering UK Ltd | Hospitality | 2025 |
| Asian Projects Ltd | Professional & scientific | 2025 |
| ASJ Pro Services Ltd | Transport & logistics | 2026 |
| ASK 4 Letting Ltd | Real estate | 2018 |
| ASK Building & Repairs Ltd | Construction | 2007 |
| ASK Corporation Limited | Hospitality | 2024 |
| ASK Digital Consultancy Ltd | Information & communication | 2018 |
| ASK Enterprises (Derby) Limited | Professional & scientific | 2008 |
| ASK Entertainment Limited | Information & communication | 2022 |
| ASK Fintax Ltd | Professional & scientific | 2025 |
| ASK Investment Holdings Limited | Financial services | 2025 |
| ASK Properties (Derby) Limited | Real estate | 2015 |
| ASK Recovery & Storage Limited | Transport & logistics | 2024 |
| ASK Recruit Services Ltd | Administrative & support | 2019 |
| ASK Travel Ltd | Administrative & support | 2019 |
| Askc Asset Management Ltd | Real estate | 2022 |
| Askda Property Limited | Real estate | 2020 |
| Askham Estates Limited | Real estate | 2025 |
| Askt Surveyors Ltd | Professional & scientific | 2026 |
| ASM Construction ENG Limited | Construction | 2023 |
| Asme.D Ltd | Wholesale & retail | 2018 |
| ASN Consulting Ltd | Administrative & support | 2025 |
| ASN Retail Ltd | Wholesale & retail | 2009 |
| ASP Furniture Design Limited | Manufacturing | 2019 |
| ASP Property Limited | Real estate | 2017 |
| ASP Property Services Limited | Real estate | 2020 |
| Aspa Limited | Wholesale & retail | 2026 |
| Aspec Autos Ltd | Wholesale & retail | 2014 |
| Aspecepic Ltd | Information & communication | 2020 |
| Aspect Consulting Engineers Limited | Construction | 2005 |
| Aspen House Limited | Health & social care | 2002 |
| Aspen Plant Ltd | Administrative & support | 2020 |
| Aspen ROW (Omega 4 Warrington) Management Company Limited | Households | 2026 |
| Aspira Group Ltd | Water & waste | 2025 |
| Aspire Achieve Advance Group Limited | Education | 2011 |
| Aspire Community and Wrestling Alliance Limited | Hospitality | 2016 |
| Aspire Pathway Group C.I.C. | Health & social care | 2019 |
| Aspire Pathway Limited | Health & social care | 2022 |
| Aspire Propco Limited | Real estate | 2024 |
| Aspire Residential Projects Ltd | Construction | 2025 |
| Aspire Wrestling C.I.C. | Arts & recreation | 2025 |
| ASR Autos Ltd | Wholesale & retail | 2022 |
| Assa’S Shop Ltd | Wholesale & retail | 2022 |
| Assemble Coaching Ltd | Professional & scientific | 2020 |
| Assemblies of the First Born | Other services | 2014 |
| Assessment Services Limited | Administrative & support | 1993 |
| Asset Networks Holdings Limited | Education | 2018 |
| Asset Networks Limited | Education | 1999 |
| Asset Properties 2010 Ltd | Households | 2025 |
| Asset Property and Investments Ltd | Real estate | 2016 |
| Asset Solutions & Investment Ltd | Households | 2026 |
| Assettagz Holdings Limited | Extraterritorial | 2026 |
| Assetworks Fleet Solutions Ltd | Information & communication | 2023 |
| Assist Protect Limited | Other services | 2010 |
| Assist Recovery Ltd | Wholesale & retail | 2019 |
| Assistopia Limited | Administrative & support | 2022 |
| Association of Railway Training Providers Ltd | Other services | 1989 |
| Association of Teachers of Mathematics(The) | Education | 1985 |
| Association of Tourism in Higher Education Limited | Other services | 1994 |
| Assured Group (Derby) Limited | Transport & logistics | 2006 |
| Asta Projects Limited | Construction | 2019 |
| Astaway Properties Limited | Households | 2025 |
| Astbury Jones Ltd | Professional & scientific | 2014 |
| Astec Conveyors Limited | Manufacturing | 2001 |
| Astley Croft Residents Management Company Limited | Households | 2025 |
| Astley Echo Services Ltd | Health & social care | 2023 |
| Astley Place (Seaton Delaval) Management Company Limited | Households | 2025 |
| Aston Croft Properties Limited | Real estate | 2020 |
| Aston Engineering Limited | Wholesale & retail | 2000 |
| Aston Hall (Derby) Management Company Limited | Households | 1998 |
| Aston Investments (UK) Limited | Real estate | 2007 |
| Aston Rentals Limited | Real estate | 2022 |
| Astra Carpets (East Midlands) Limited | Wholesale & retail | 2013 |
| Astralis Tutors Limited | Education | 2025 |
| Astrena Properties Ltd | Real estate | 2026 |
| Astronaut Jobs Limited | Professional & scientific | 2024 |
| Astute Ecology Limited | Professional & scientific | 2017 |
| Astute Financial & Lifestyle Planning Limited | Financial services | 2005 |
| Astute Recruitment Ltd | Administrative & support | 2009 |
| Asygames Ltd | Manufacturing | 2024 |
| Asylum Retail Limited | Wholesale & retail | 2012 |
| AT Building Work Ltd | Construction | 2020 |
| AT Daniels Properties Limited | Real estate | 2022 |
| AT Electrical & Communications Limited | Construction | 2008 |
| AT Electrical Solutions Ltd | Construction | 2015 |
| AT Gyros Ltd | Hospitality | 2024 |
| AT Home Sense Ltd | Wholesale & retail | 2023 |
| AT Lettings Limited | Real estate | 2012 |
| AT Lift Solutions Limited | Construction | 2019 |
| AT One Change Solutions Ltd | Administrative & support | 2023 |
| AT Services (Nottingham) Limited | Construction | 2003 |