| Asnaff Property Limited | Real estate | 2024 |
| Asone Management Limited | Financial services | 2024 |
| Asons Worldwide Ltd | Wholesale & retail | 2024 |
| Asovia Ltd | Manufacturing | 2026 |
| ASP Fencing Ltd | Construction | 2010 |
| Aspberry Management Services Ltd | Professional & scientific | 2020 |
| Aspect Design Ltd | Extraterritorial | 2013 |
| Aspect Film and Video Productions Ltd | Information & communication | 2021 |
| Aspect Media International Limited | Information & communication | 2009 |
| Aspect Rendering Bristol Limited | Construction | 2020 |
| ASPECT360 Limited | Professional & scientific | 2007 |
| Aspectdeal Property Management Limited | Households | 1996 |
| Aspectnew Property Management Limited | Households | 1994 |
| Aspects Adult Autism Psychology Ltd | Health & social care | 2018 |
| Aspects Solutions (Window Cleaning) Limited | Administrative & support | 2012 |
| Aspen Eastbank Management Limited | Real estate | 2011 |
| Aspen Grange Court Management Company Limited | Households | 2010 |
| Aspen Park Road Management Company Limited | Professional & scientific | 2002 |
| Aspen Partnership Limited | Construction | 2011 |
| Aspen Psychology Services Ltd | Education | 2013 |
| Aspen Services Limited | Manufacturing | 1986 |
| Aspen UK Retail 2 Ltd | Financial services | 2021 |
| Aspinall Aesthetics Education Ltd | Education | 2026 |
| Aspinall Aesthetics Limited | Education | 2021 |
| Aspinall Aesthetics Training Academy Ltd | Other services | 2022 |
| Aspirantt Ltd | Wholesale & retail | 2026 |
| Aspiration Creation Elevation C.I.C. | Arts & recreation | 2013 |
| Aspirations Financial Advice Ltd | Financial services | 2012 |
| Aspirations Support Bristol Limited | Health & social care | 2009 |
| Aspire Bathrooms & Heating Ltd | Construction | 2025 |
| Aspire Bidco Limited | Other services | 2019 |
| Aspire Care (SW) Limited | Health & social care | 2019 |
| Aspire Care Ltd | Health & social care | 2024 |
| Aspire Dance Events Ltd | Other services | 2024 |
| Aspire Engineering Services Ltd | Other services | 2021 |
| Aspire Europe Limited | Administrative & support | 2004 |
| Aspire Glass Ltd | Construction | 2016 |
| Aspire Holdco Limited | Other services | 2019 |
| Aspire Link Education Initiative Limited | Professional & scientific | 2025 |
| Aspire Living Innovations Ltd | Information & communication | 2026 |
| Aspire Midco Limited | Other services | 2019 |
| Aspire Taxi Hire Limited | Transport & logistics | 2025 |
| Aspire Topco Limited | Other services | 2019 |
| Aspire Wright Education Ltd | Other services | 2023 |
| ASPIRE2BUILD Ltd | Other services | 2018 |
| Aspirent Group Limited | Professional & scientific | 2020 |
| Aspiring Estates Ltd | Real estate | 2021 |
| Aspley Battery Storage Limited | Energy | 2023 |
| Aspyre Limited | Professional & scientific | 2008 |
| Asquare Properties Limited | Real estate | 2008 |
| ASR Construction Bristol Limited | Construction | 2020 |
| ASR Car & Commercials Ltd | Wholesale & retail | 2025 |
| Asset Business Systems Limited | Information & communication | 1997 |
| Asset Family Limited | Information & communication | 2025 |
| Asset Leasing Services Limited | Administrative & support | 1988 |
| Asset Management Systems Limited | Professional & scientific | 2024 |
| Asset One Professional Engineering Services Limited | Professional & scientific | 2018 |
| Asset One Services LLP | | 2009 |
| Asset Property Development Limited | Construction | 2007 |
| Assetive Ltd | Real estate | 2022 |
| Assets Consultancy Ltd | Administrative & support | 2024 |
| Assets of JMT Ltd | Other services | 2018 |
| Assignn Ltd | Administrative & support | 2021 |
| Assignterm Property Management Limited | Real estate | 1992 |
| Assis Maintenance & Recovery Ltd | Wholesale & retail | 2023 |
| Assisi Developments Limited | Real estate | 2021 |
| Assistive Fintech LAB Limited | Information & communication | 2025 |
| Assistplus CIC | Administrative & support | 2018 |
| Assmbly Tickets Ltd | Arts & recreation | 2026 |
| Associated Business Consultants Limited | Professional & scientific | 2001 |
| Associated Contract Energy Limited | Real estate | 1988 |
| Associated Design & Installations Ltd | Construction | 2009 |
| Associated Epos Ltd | Wholesale & retail | 2020 |
| Associated Sub-Contractors in Limited Partnership With Chester Lebiedz | | 2009 |
| Association for Solution Focused Hypnotherapy Limited | Other services | 2010 |
| Association for the Understanding of Artificial Intelligence | Education | 2019 |
| Association of Community Amateur Sports Clubs & Community Interest Fundraisers (Acasc/Acif) CIC | Other services | 2009 |
| Association of Community Organizations for Reform NOW International Ltd | Other services | 2026 |
| Association of Crime and Intelligence Analysts (Acia) | Other services | 2008 |
| Association of Local Landlords (Wessex) Ltd | Professional & scientific | 2016 |
| Assorted Works Limited | Hospitality | 2005 |
| Assured Access Scaffolding Limited | Construction | 2025 |
| Assured Digital Genomics Limited | Professional & scientific | 2016 |
| Assured Digital Group Limited | Professional & scientific | 2015 |
| Assured Digital Technologies Limited | Information & communication | 2020 |
| Assured Retirement Limited | Financial services | 2014 |
| Assured Retirement Trustees Limited | Professional & scientific | 2017 |
| Assured Roofing Southwest Limited | Construction | 2004 |
| Assured Searches Ltd | Information & communication | 2003 |
| Assured Travel Solutions Ltd | Information & communication | 2014 |
| Assurity Solutions Ltd | Financial services | 2010 |
| Assurity Systems Limited | Information & communication | 2018 |
| Assw Properties Ltd | Real estate | 2022 |
| Assynt Group Limited | Information & communication | 2008 |
| Astana Investments Limited | Real estate | 2025 |
| Astay Ltd | Hospitality | 2018 |
| Aster Commercial Services Limited | Administrative & support | 2017 |
| Asteria Leisure Limited | Arts & recreation | 2000 |
| Asteria's Playground Ltd | Arts & recreation | 2024 |
| Asteyasoul Ltd | Information & communication | 2025 |