| Ascending Tribe Limited | Extraterritorial | 2022 |
| Ascension Solutions Limited | Real estate | 2022 |
| Ascent Services Ltd | Administrative & support | 2024 |
| Ascent Technology Ltd | Professional & scientific | 2025 |
| Ascot Place (Branksome Park) Management Limited | Households | 2020 |
| ASF Interactive Limited | Information & communication | 2022 |
| ASH Enterprises Limited | Hospitality | 2002 |
| ASH Haus Ltd | Construction | 2019 |
| ASH House Associates Limited | Professional & scientific | 2009 |
| ASH Tree Contracting Ltd | Administrative & support | 2021 |
| Ashbourne Business Services Ltd | Administrative & support | 2025 |
| Ashbourne IT Consulting Limited | Information & communication | 2022 |
| Ashbrooke Holdings Ltd | Administrative & support | 2018 |
| Ashdown Heating & GAS Ltd | Construction | 2019 |
| Ashdown Studio Ltd | Professional & scientific | 2022 |
| Asher Care Holdings Limited | Professional & scientific | 2020 |
| Asher Carehome Ltd | Health & social care | 2024 |
| Ashford Labs Limited | Professional & scientific | 2026 |
| Ashington Estates Limited | Extraterritorial | 2003 |
| Ashland Builders Limited | Construction | 2017 |
| Ashleighs Boutique Jewels Ltd | Wholesale & retail | 2023 |
| Ashley & Pollock (Assets) Limited | Administrative & support | 2013 |
| Ashley & Pollock Limited | Administrative & support | 2013 |
| Ashley 392B Ltd | Real estate | 2024 |
| Ashley 392C Ltd | Real estate | 2024 |
| Ashley Bearings Limited | Wholesale & retail | 1998 |
| Ashley Blinds (UK) Ltd | Wholesale & retail | 2014 |
| Ashley Cross Management Company Ltd | Households | 2025 |
| Ashley Home Development Ltd | Construction | 2025 |
| Ashley Home Improvements Limited | Construction | 2017 |
| Ashley Louise Consulting Ltd | Professional & scientific | 2026 |
| Ashley Place Residents Company Limited | Households | 2003 |
| Ashley Press Ltd | Manufacturing | 2014 |
| Ashley Road (29) Management Company Limited | Households | 2007 |
| Ashley Roofing Maintenance Ltd | Construction | 2022 |
| Ashtam LL Ltd | Professional & scientific | 2024 |
| Ashton Steel Trading Co. Ltd | Professional & scientific | 2023 |
| Ashwood Consulting Ltd | Professional & scientific | 2017 |
| Ashworth Caines Limited | Professional & scientific | 2022 |
| Asianship Ltd | Education | 2017 |
| Asidus Pools Limited | Construction | 2025 |
| Asiste Secure Ltd | Other services | 2021 |
| ASK Jules Student Support Limited | Other services | 2015 |
| ASK Tree Surgeons Limited | Administrative & support | 2020 |
| Askforindigo Ltd | Wholesale & retail | 2026 |
| Askjules Ltd | Other services | 2012 |
| ASL 620 Limited | Transport & logistics | 2004 |
| Aslanli Ltd | Wholesale & retail | 2026 |
| Asma AL Rujaibi Limited | Wholesale & retail | 2025 |
| Asnet Monitoring Ltd | Information & communication | 2014 |
| Asooma Store Limited | Wholesale & retail | 2025 |
| ASP Seat Limited | Wholesale & retail | 2023 |
| Aspeling Ltd | Financial services | 2026 |
| Aspen Cleaning Services Ltd | Administrative & support | 2024 |
| Aspen Investments Limited | Real estate | 2013 |
| Aspirational Coaching Ltd | Other services | 2021 |
| Aspirations Freehold Limited | Households | 2014 |
| Aspire Bespoke Developments Limited | Construction | 2025 |
| Aspire Cleaning Services (Purbeck) Limited | Administrative & support | 2021 |
| Aspire Consultancy (UK) Limited | Other services | 2014 |
| Aspire Estates Property Ltd | Real estate | 2022 |
| Aspire Property Holdings (Castle) Limited | Financial services | 2018 |
| Aspire Property Holdings Ltd | Real estate | 2016 |
| Aspire Shutters Ltd | Construction | 2020 |
| Asplan Associates Ltd | Professional & scientific | 2013 |
| Aspray House Ltd | Health & social care | 2003 |
| Aspyre Consulting Ltd | Public administration | 2017 |
| Asramu Consulting Ltd | Information & communication | 2024 |
| Asset Browser Ltd | Professional & scientific | 2025 |
| Assetria Limited | Real estate | 2002 |
| Assoma Europe Ltd | Wholesale & retail | 2026 |
| Assured Response Ltd | Other services | 2023 |
| Assured Storage Limited | Transport & logistics | 2022 |
| Astera Barber Ltd | Other services | 2025 |
| Asterelle Ltd | Wholesale & retail | 2025 |
| Astra Nest Hub Ltd | Information & communication | 2025 |
| Astra Technology Ltd | Professional & scientific | 2022 |
| Astrid Harris Coaching Limited | Arts & recreation | 2022 |
| Astrozie Limited | Wholesale & retail | 2021 |
| Astrum Limited | Arts & recreation | 1998 |
| Asylum Applications Ltd | Information & communication | 2022 |
| AT Metals Ltd | Professional & scientific | 2017 |
| AT the Helm (UK) Ltd | Education | 2014 |
| ATA Property Investment Limited | Real estate | 2022 |
| Atack Investments Limited | Real estate | 2024 |
| ATB Technology Limited | Information & communication | 2010 |
| ATE Property 1 Ltd | Real estate | 2026 |
| ATE Property 2 Ltd | Real estate | 2026 |
| ATE Property Holdings Ltd | Financial services | 2026 |
| Atec Maintenance Limited | Construction | 2025 |
| Atelier Group Limited | Real estate | 2019 |
| Atelier Morganmarsh Ltd | Manufacturing | 2017 |
| Athann Limited | Wholesale & retail | 2024 |
| Athelstone Holdings Ltd | Construction | 2019 |
| Athena Collections Ltd | Administrative & support | 2017 |
| Athena Commerce Limited | Other services | 2019 |
| Athena Holdco Limited | Financial services | 2019 |
| Athena Pathway Programme | Arts & recreation | 2023 |
| Athena Racing Limited | Arts & recreation | 2013 |
| Athena Sports Group Ltd | Financial services | 2025 |