| Analogies Cloud Limited | Education | 2025 |
| Anas IT Ltd | Information & communication | 2025 |
| Anas Online Market Limited | Wholesale & retail | 2026 |
| Anatahan Limited | Wholesale & retail | 2020 |
| Anaxy Limited | Information & communication | 2021 |
| Anayasway Ltd | Hospitality | 2024 |
| Anbouche Trading Limited | Administrative & support | 2016 |
| ANC Software Ltd | Information & communication | 2007 |
| Anchor Capital Solutions Limited | Financial services | 2025 |
| Anchor Court Management (Ipswich) Limited | Households | 2008 |
| Anchor Developments Group Limited | Real estate | 2020 |
| Anchor Developments Ltd | Construction | 2014 |
| Anchor Motors Limited | Wholesale & retail | 2002 |
| Ancient and Curious Properties Ltd | Real estate | 2021 |
| AND Worldwide Limited | Transport & logistics | 2002 |
| Anderson Cleaning and Care Services Ltd | Administrative & support | 2020 |
| Anderson Planning and Development Ltd | Administrative & support | 2001 |
| Anderson Security & Emergency Systems Limited | Construction | 2004 |
| Anderson Systems Limited | Extraterritorial | 2009 |
| Andfm Limited | Information & communication | 2024 |
| Andmu Care Services Limited | Health & social care | 2022 |
| Andraste Accounting Ltd | Professional & scientific | 2015 |
| Andre Boat Ltd | Other services | 2018 |
| Andrea Parsons Limited | Administrative & support | 2018 |
| Andreas-Carter (Education) Limited | Education | 2000 |
| Andreas-Carter (Sports Marketing) Limited | Administrative & support | 1988 |
| Andreeaducu Limited | Health & social care | 2017 |
| Andrew Breckenridge Limited | Financial services | 2021 |
| Andrew Casey Financial Services Ltd | Financial services | 2012 |
| Andrew Foster Teaching Limited | Professional & scientific | 2015 |
| Andrew HAY Advisory Limited | Financial services | 2019 |
| Andrew Ladbrook Ltd | Financial services | 2025 |
| Andrew Michael Property Services Ltd | Real estate | 2021 |
| Andrew Rawlinson Properties Limited | Hospitality | 2021 |
| Andrewex UK Ltd | Wholesale & retail | 2022 |
| Andrews Aerials Ltd | Administrative & support | 2014 |
| Andrews Brickwork Limited | Construction | 2012 |
| Andrews Plumbing and Heating Ltd | Construction | 2006 |
| Andrews Rentals Ltd | Administrative & support | 2016 |
| Andromeda Solutions PVT Ltd | Health & social care | 2014 |
| Andrzej Krupinski Ltd | Transport & logistics | 2023 |
| Andtax Limited | Professional & scientific | 2017 |
| Andy Elms CM Ltd | Construction | 2023 |
| Andy Higgleton Limited | Construction | 2003 |
| Andy Hughes Ltd | Professional & scientific | 2017 |
| Andy Rhodes Holdings Limited | Real estate | 2024 |
| Anexcroft Limited | Professional & scientific | 1999 |
| Angalamma Limited | Health & social care | 2009 |
| Angel and Blume Limited | Administrative & support | 2009 |
| Angel Court (Colchester) Management Company Limited | Households | 2015 |
| Angela's Coffee Shop Limited | Hospitality | 2008 |
| Angelina's Day Care Ltd | Health & social care | 2023 |
| Angelita Ltd | Wholesale & retail | 2025 |
| Angell Property Investments Limited | Real estate | 2018 |
| Angelo Investment Limited | Real estate | 2022 |
| Angels B.S. Care LLP | | 2022 |
| Angels Homecare Services Ltd | Health & social care | 2024 |
| Anglernwa Ltd | Wholesale & retail | 2025 |
| Angley Two (Property Development) Limited | Administrative & support | 2018 |
| Anglia Accountancy Limited | Professional & scientific | 2002 |
| Anglia Acoustics Limited | Manufacturing | 2022 |
| Anglia Bulb Co. Limited | Wholesale & retail | 2003 |
| Anglia Business Services Limited | Real estate | 2004 |
| Anglia Care Ltd | Extraterritorial | 2015 |
| Anglia Classical Guitars Ltd | Wholesale & retail | 2019 |
| Anglia Grain Holdings Limited | Professional & scientific | 2016 |
| Anglia Green Construction Ltd | Construction | 2007 |
| Anglia Home Care Limited | Health & social care | 2002 |
| Anglia Hotel Management Ltd | Hospitality | 2018 |
| Anglia Inspection Services Limited | Manufacturing | 2004 |
| Anglia Labels (Sales) Limited | Manufacturing | 1980 |
| Anglia Landscapes Rental Ltd | Real estate | 2020 |
| Anglia Peoplecarriers Ltd | Wholesale & retail | 2003 |
| Anglia Tile Decorating Services Limited | Construction | 1986 |
| Anglia Vehicle Solutions Ltd | Wholesale & retail | 2024 |
| Anglian Community Trust (ACT) | Health & social care | 2013 |
| Anglian Decorating Services Limited | Construction | 2013 |
| Anglian Mechanical Services Limited | Construction | 2019 |
| Anglian Mortgage Services Limited | Financial services | 2020 |
| Anglian Positive Management Ltd | Professional & scientific | 2021 |
| Anglo Ground Services Ltd | Administrative & support | 2006 |
| Anglophone Trading Ltd | Information & communication | 2018 |
| Angloplas Limited | Extraterritorial | 1983 |
| Angly Limited | Wholesale & retail | 2019 |
| Angus Buchanan Workshop Limited | Wholesale & retail | 2007 |
| Animal Magic Boarding Kennels and Cattery Ltd | Agriculture & fishing | 2022 |
| Animal Magic Kennels & Cattery Ltd | Agriculture & fishing | 2020 |
| Aniska Children’S Support Ltd | Health & social care | 2026 |
| Ankaya Ltd | Hospitality | 2025 |
| ANL Bistro Limited | Hospitality | 2023 |
| Anna Everitt Events Limited | Administrative & support | 2010 |
| Anna's Properties Ltd | Real estate | 2021 |
| Annabel Active Ltd | Education | 2021 |
| Annabelle (East Anglia) Limited | Wholesale & retail | 2018 |
| Annapolis Properties Ltd. | Real estate | 2003 |
| Annapurna Estates Ltd | Real estate | 2023 |
| Anne - Marie Residents Ltd | Real estate | 2020 |
| Anneo Luxury Ltd | Other services | 2024 |
| Annorlundadm Ltd | Professional & scientific | 2025 |
| Annual Play Inspections Ltd | Other services | 2022 |