| Asha (Norwich) Limited | Real estate | 2024 |
| Ashbrook Meadows Management Company Limited | Households | 2006 |
| Ashburnham Solicitors Limited | Professional & scientific | 2014 |
| Ashcroft 2021 Ltd | Real estate | 2021 |
| Ashdown Nichol Medical Services Ltd | Health & social care | 2023 |
| Ashford Residential Development Limited | Construction | 2014 |
| Ashfords Grounds Maintenance Ltd | Administrative & support | 2002 |
| Ashglo Distribution Ltd | Wholesale & retail | 2023 |
| Ashi Bidco 10 Limited | Extraterritorial | 2024 |
| Ashi Bidco 7 Limited | Extraterritorial | 2024 |
| Ashi Bidco 9 Limited | Extraterritorial | 2024 |
| Ashi Group Limited | Manufacturing | 1990 |
| Ashiana Appleby Limited | Hospitality | 2019 |
| Ashley ADS Ltd | Manufacturing | 2000 |
| Ashley Care Group Limited | Other services | 2016 |
| Ashley Care Homes Limited | Health & social care | 2003 |
| Ashley Grove & Company Ltd | Construction | 2018 |
| Ashley Hinchcliffe Studio Ltd | Professional & scientific | 2021 |
| Ashley Marchant Estates Limited | Real estate | 2017 |
| Ashley Marchant Living Limited | Real estate | 2020 |
| Ashmartin Ltd | Real estate | 2004 |
| Ashtons ( London ) Ltd | Real estate | 2009 |
| Ashtons Franchise Consulting Limited | Administrative & support | 2014 |
| Ashtons Legal (Properties) Ltd | Professional & scientific | 2015 |
| Ashtree Electrical & Security Limited | Construction | 2012 |
| Ashwell Biomass Limited | Manufacturing | 1992 |
| Ashwell Metals Limited | Water & waste | 2007 |
| Ashwell Renovations Limited | Construction | 2008 |
| Ashwood Bespoke Ltd | Construction | 2024 |
| Ashwood Music Publishing Limited | Information & communication | 2012 |
| Ashwood Records Limited | Arts & recreation | 2014 |
| Ashwood Technology Limited | Information & communication | 1996 |
| ASI Decoration Ltd | Construction | 2025 |
| ASI Housing Ltd | Real estate | 2025 |
| ASI Recruitment Ltd | Administrative & support | 2014 |
| Asia Mobile Norwich Ltd | Other services | 2023 |
| Asia Pacific Concepts Limited | Wholesale & retail | 2002 |
| Asis Enterprises Ltd | Professional & scientific | 2024 |
| ASK Leida Ltd | Information & communication | 2026 |
| Askdentist Limited | Health & social care | 2019 |
| Asker Limited | Hospitality | 2019 |
| Asklepios Health Care Limited | Transport & logistics | 2019 |
| Asklogix Limited | Information & communication | 2013 |
| ASL Electrical Services Limited | Construction | 2021 |
| Aslan B Limited | Hospitality | 2025 |
| Aslan Fish and Chips Ltd | Hospitality | 2025 |
| Aslan Kebabs Ltd | Hospitality | 2025 |
| ASM Contact Holdings Ltd | Financial services | 2023 |
| Asmr Planet Limited | Professional & scientific | 2022 |
| ASN Distribution Ltd | Transport & logistics | 2021 |
| ASP Wills Ltd | Professional & scientific | 2015 |
| Aspect East Anglia Limited | Extraterritorial | 2017 |
| Aspect Group Holdings Limited | Construction | 2016 |
| Aspect Group Services Limited | Construction | 1990 |
| Aspects Visions Limited | Real estate | 2020 |
| ASPEKT32 Limited | Administrative & support | 2015 |
| Aspen Close Residential Management Limited | Households | 2026 |
| Asperger Community Development (East Anglia) Limited | Wholesale & retail | 2011 |
| Aspirational Equipment Ltd | Arts & recreation | 2019 |
| Aspire (Bedford Street Ipswich) Residents Company Limited | Households | 2010 |
| Aspire Energy Ltd | Construction | 2019 |
| Aspire Financial Ltd | Financial services | 2009 |
| Aspire Holdings Uk/Esp Ltd | Real estate | 2024 |
| Aspire Mortgages Limited | Financial services | 2007 |
| Aspire Plastering Limited | Construction | 2014 |
| Aspire Will Writers Ltd | Real estate | 2011 |
| Aspland Cars Limited | Wholesale & retail | 1976 |
| Aspland Self Drive Ltd | Wholesale & retail | 2026 |
| Aspland Van Centre Ltd | Administrative & support | 2026 |
| ASR Aircraft Structures & Fabrication Services Ltd | Extraterritorial | 2024 |
| ASS -Samee Limited | Professional & scientific | 2015 |
| Assemblage Design Ltd | Manufacturing | 2021 |
| Assembly Apparel Ltd | Wholesale & retail | 2022 |
| Assembly House Caterers Limited | Hospitality | 1960 |
| Assessment Microanalytics Limited | Professional & scientific | 2018 |
| Asset Financial Engineering Limited | Financial services | 2019 |
| Asset Financial Services Limited | Financial services | 2019 |
| Asset Group Real Estate Limited | Real estate | 2016 |
| Asset Investment Management Ltd. | Financial services | 2006 |
| Asset Risk & Resilience in Operations Ltd | Construction | 2024 |
| Asset Stud Ltd | Agriculture & fishing | 2021 |
| Assets Speak Ltd | Financial services | 2022 |
| Assetspire Limited | Information & communication | 2011 |
| Assist Trust | Health & social care | 1996 |
| Association for Reaching & Instructing Children in Africa | Education | 1999 |
| Association for Research in the Voluntary and Community Sector (Arvac) | Other services | 1987 |
| Association of Carmels Trustee Limited | Households | 2007 |
| Association of Somatic and Integrative Sexologists Ltd | Other services | 2013 |
| Assos Food Ltd | Hospitality | 2020 |
| Assured Builders Ltd | Construction | 2023 |
| Assured IT Solutions Limited | Information & communication | 2016 |
| Assured Quality and Safety Limited | Administrative & support | 2004 |
| Assurity Ltd | Information & communication | 2020 |
| Assurka Limited | Information & communication | 2021 |
| Astec Limited | Construction | 1989 |
| Astenbell Limited | Construction | 2002 |
| Astero Falcon Services Limited | Financial services | 2025 |
| Asteroceras Group Ltd | Real estate | 2019 |
| Asteroid Fireworks Ltd | Wholesale & retail | 2016 |
| Aston Developments Limited | Construction | 2003 |