| Akentmarine Ltd | Administrative & support | 2019 |
| Akethorpe Consultancy Services Limited | Extraterritorial | 2016 |
| AKP Limited | Manufacturing | 2015 |
| AL International Construction Limited | Construction | 2023 |
| Al-Habib Food Ltd | Hospitality | 2023 |
| Alam Family Properties Ltd | Real estate | 2022 |
| Alan Howarth (Primary Care) Limited | Construction | 2003 |
| Alarm Shop Limited | Wholesale & retail | 2015 |
| Albatech UK Ltd | Wholesale & retail | 2024 |
| Albc Ltd | Professional & scientific | 2015 |
| Aldebaran Engineering Ltd | Other services | 2016 |
| Aldridge Technical Ltd | Real estate | 2025 |
| Alex Wentworth-Wood Ltd | Professional & scientific | 2025 |
| Alfie’S Community ARK CIC | Wholesale & retail | 2020 |
| Alfira Ltd | Wholesale & retail | 2025 |
| Aligned Counselling Collective C.I.C. | Health & social care | 2026 |
| Alison LEE Ltd | Other services | 2016 |
| ALL Pets Pet Emporium Limited | Wholesale & retail | 2025 |
| ALL Seasons Hospitality Limited | Hospitality | 2022 |
| Allerton Marine Services Limited | Manufacturing | 2014 |
| Allmech Limited | Mining & quarrying | 2015 |
| Allmech Services Ltd | Mining & quarrying | 2016 |
| Allport Communications Limited | Information & communication | 2019 |
| Alpha Motorworks Ltd | Wholesale & retail | 2023 |
| Alpha Roofing Services Limited | Construction | 1995 |
| Alpha Scaffolding Anglia Ltd | Construction | 2025 |
| Alpharoof Ltd | Construction | 2024 |
| Alpine Fabrication Services Limited | Manufacturing | 2003 |
| Alrose Foods Ltd | Hospitality | 2020 |
| ALS Rental Properties Limited | Real estate | 2020 |
| Altade Ltd | Administrative & support | 2013 |
| Alter Lingo Limited | Professional & scientific | 2010 |
| Alternative Pleasures (Entertainments) Ltd | Health & social care | 2025 |
| Althea Healthcare (Holdings) Limited | Health & social care | 2010 |
| Althea Healthcare (Management) Limited | Health & social care | 2011 |
| Althea Healthcare Investments Limited | Health & social care | 2008 |
| Althea Healthcare Limited | Health & social care | 2007 |
| Althea Healthcare Properties Limited | Health & social care | 2007 |
| Althea Investments Ltd | Health & social care | 2011 |
| AM Paving Limited | Construction | 2005 |
| Amadercompany Ltd | Wholesale & retail | 2025 |
| Amandas Homes Ltd | Real estate | 2023 |
| Amari Care Services Ltd | Health & social care | 2015 |
| Amasia Architects Ltd | Professional & scientific | 2009 |
| Amazonia Associates Limited | Arts & recreation | 2003 |
| Ambishun Consulting Limited | Professional & scientific | 2020 |
| AMG Elec Ltd | Construction | 2024 |
| AMINI243 Ltd | Other services | 2022 |
| AMK Modular Construction Ltd | Construction | 2026 |
| AMP Media Limited | Information & communication | 2013 |
| Anchor Capital Investments Limited | Other services | 2026 |
| Anchor Gents Barber Ltd | Other services | 2025 |
| Anchor Homecare Ltd | Health & social care | 2025 |
| Anchorage Estates Limited | Real estate | 1999 |
| AND Property Matters Ltd | Professional & scientific | 2023 |
| Andalusia Hire Services Limited | Extraterritorial | 2015 |
| Andalusia Trading Limited | Transport & logistics | 2014 |
| Andrew Padgett Ltd | Administrative & support | 2019 |
| Andy Brown Sustainability Limited | Professional & scientific | 2026 |
| Andy's Fit 4 Life Ltd | Arts & recreation | 2022 |
| Andys Mech Services Limited | Manufacturing | 2019 |
| Ange & Co Limited | Real estate | 2012 |
| Anglia Awnings Limited | Other services | 2008 |
| Anglia Electrical & Security Limited | Construction | 2002 |
| Anglia Offshore Marine Consultancy Ltd | Professional & scientific | 2026 |
| Anglia Taxis GY Limited | Transport & logistics | 2019 |
| Anglia Trade Holdings Ltd | Professional & scientific | 2024 |
| Anglia Trade Windows Limited | Wholesale & retail | 2011 |
| Anglian Electrical Company Limited | Construction | 2011 |
| Anglian Installations Limited | Construction | 2018 |
| ANN Reid Ltd | Professional & scientific | 2021 |
| Anna's Cleaning Services Limited | Other services | 2019 |
| Annabelles Equestrian Limited | Arts & recreation | 2018 |
| Annie Violet Limited | Wholesale & retail | 2017 |
| ANO Estates Ltd | Extraterritorial | 2024 |
| Anthony Sharman WS Limited | Professional & scientific | 2014 |
| ANY Hire Limited | Administrative & support | 2017 |
| AO Tailoring Services Ltd | Other services | 2020 |
| AP Sports Consultancy Limited | Administrative & support | 2024 |
| APB Accounting Services Limited | Professional & scientific | 2002 |
| APB Investments Limited | Financial services | 2013 |
| Apex Home Improvements (UK) Limited | Professional & scientific | 2019 |
| Apex Scaffolding Anglia Ltd | Construction | 1999 |
| Apidm Global (UK) Limited | Education | 2021 |
| Apollo Enterprises (East Anglia) Limited | Education | 2011 |
| Appleton Childcare Limited | Administrative & support | 2017 |
| Applied Design and Engineering Limited | Manufacturing | 1984 |
| Appreciating Assets Limited | Construction | 2020 |
| Apps Business Holdings Ltd | Financial services | 2023 |
| Aquila Aurorae Ltd | Wholesale & retail | 2021 |
| AR Fulfilment Services Ltd | Transport & logistics | 2025 |
| Aragon Care Timperley Limited | Health & social care | 2006 |
| Aramat Developments Limited | Real estate | 2016 |
| ARC Forrest Limited | Professional & scientific | 2015 |
| Arcwest Ltd | Construction | 2006 |
| Ardmair Bay Holdings Limited | Financial services | 2017 |
| Area Construction (EA) Ltd | Construction | 2016 |
| Areascaffoldingea Ltd | Construction | 2025 |
| ARL Advisory Limited | Professional & scientific | 2020 |
| Armes Fabrication Services Limited | Manufacturing | 2019 |