| Addy Futures Limited | Administrative & support | 2022 |
| ADG Oilfield Services Limited | Mining & quarrying | 2014 |
| ADH Inspections Limited | Professional & scientific | 2013 |
| ADL Transport Solution Ltd | Transport & logistics | 2025 |
| ADM (EA) Ltd | Hospitality | 2024 |
| Adnan Medics Limited | Health & social care | 2024 |
| Adrian Matthew Builders Ltd. | Construction | 1996 |
| Adrm Care Limited | Health & social care | 2025 |
| Advanced Lifting Limited | Construction | 2022 |
| Advanced Machinery Relocations Limited | Transport & logistics | 2002 |
| Advanced Roofing Specialists Ltd | Construction | 2021 |
| Advanced Scaffolding (EA) Ltd | Construction | 2024 |
| ADW Construction Ltd | Construction | 2023 |
| Aerial Pro Solutions Limited | Professional & scientific | 2023 |
| Aerocoat EA Limited | Manufacturing | 2012 |
| Aether Dental Limited | Health & social care | 2023 |
| Aether Ecology Limited | Professional & scientific | 2013 |
| AF Claxton Holding Limited | Financial services | 2026 |
| AF Scaffolding Great Yarmouth Ltd | Construction | 2019 |
| Affordable Drains Ltd | Construction | 2024 |
| AG Agyee Limited | Health & social care | 2022 |
| Agea Properties Limited | Real estate | 2026 |
| AGK Entertainments Limited | Professional & scientific | 2024 |
| AH Deals Ltd | Wholesale & retail | 2026 |
| AH Impact Piling Services Ltd | Mining & quarrying | 2021 |
| AH James Financial Limited | Financial services | 2018 |
| Ahna Property Company Limited | Real estate | 2014 |
| Ahpodd Business Services Limited | Professional & scientific | 2003 |
| AI 2K Limited | Information & communication | 2025 |
| AI Claws Ltd | Hospitality | 2026 |
| AI Products Holdings Ltd | Information & communication | 2025 |
| Aidely Limited | Information & communication | 2025 |
| AIM (East Anglia) Limited | Wholesale & retail | 2008 |
| Aire-Tek Services Limited | Manufacturing | 2003 |
| AJ Building Contractors Ltd | Manufacturing | 2026 |
| AJ Car Spa Limited | Administrative & support | 2023 |
| AJ Fuel Supplies Ltd | Wholesale & retail | 2020 |
| AJ Pizza GY Limited | Hospitality | 2025 |
| AJ Trade Plastics Ltd | Wholesale & retail | 2012 |
| AJ Trade Plus Ltd | Construction | 2019 |
| AJ10 Ltd | Wholesale & retail | 2021 |
| AJJ Confectionery Limited | Wholesale & retail | 2021 |
| AJL Holdings Ltd | Financial services | 2021 |
| AJM Builders (East Anglia) Limited | Construction | 2020 |
| Aklp Properties Ltd | Real estate | 2026 |
| AL HAQ Limited | Hospitality | 2013 |
| AL Harvey Limited | Transport & logistics | 2019 |
| Al-Tamim Great Yarmouth Ltd | Hospitality | 2025 |
| Alan Harper Associates Limited | Other services | 2012 |
| Albemarle Prime Properties Limited | Real estate | 2017 |
| Albies Ltd | Transport & logistics | 2011 |
| Alder Avenue (Martham) Management Company Limited | Real estate | 2015 |
| Aldred Electrical Services Limited | Construction | 2022 |
| Aldreds Estate Agents Limited | Real estate | 2014 |
| Aledra Limited | Real estate | 2006 |
| Alex Tooke Ltd | Real estate | 2026 |
| Alicat Workboats Limited | Manufacturing | 2009 |
| Aliheim Limited | Construction | 2024 |
| Alisita Style Ltd | Wholesale & retail | 2026 |
| Alison Neary Properties Ltd | Households | 2026 |
| Alistair Harrison Communications Ltd | Professional & scientific | 2020 |
| ALL in One Mini Market Ltd | Wholesale & retail | 2024 |
| ALL Saints School (Lessingham) Limited | Education | 2016 |
| Allen Fabrication (UK) Limited | Construction | 2014 |
| Allibone Inns Ltd | Hospitality | 2024 |
| Almisv Limited | Wholesale & retail | 2013 |
| Almond Road Convenience Store Ltd | Wholesale & retail | 2017 |
| Alpha and Omega Energy Ltd | Extraterritorial | 2024 |
| Alpha Decorating Contractors Ltd | Construction | 2016 |
| Alpha Eco Systems Limited | Construction | 2011 |
| Alpheagle Co Ltd | Transport & logistics | 2025 |
| Alpine Cleaning Services (Norfolk) Limited | Administrative & support | 2004 |
| Altus Projects Limited | Construction | 2022 |
| Alveoplasty Limited | Health & social care | 2018 |
| ALW Health Limited | Health & social care | 2021 |
| AM 360 Consulting Limited | Administrative & support | 2015 |
| Ambassador Travel (Anglia) Limited | Transport & logistics | 1984 |
| Amberlee Holdings Limited | Real estate | 2023 |
| Amelang Limited | Construction | 2012 |
| Amey Enterprises Limited | Hospitality | 2025 |
| Amity Accountancy Ltd | Professional & scientific | 2024 |
| AMN Engineering Ltd | Professional & scientific | 2024 |
| Amnalisj Occasions Limited | Real estate | 2016 |
| Amour INK Ltd | Arts & recreation | 2014 |
| AMS Window Cleaning Limited | Administrative & support | 2023 |
| Analysis Management Ltd | Wholesale & retail | 2011 |
| Ancient History Limited | Wholesale & retail | 2019 |
| Ancient Olives Limited | Wholesale & retail | 2025 |
| Anderson Legacy Ltd | Hospitality | 2026 |
| Andrews & Co Property Limited | Households | 2023 |
| Andromeda Estates Ltd | Real estate | 2023 |
| Andrus Commercial Ltd | Real estate | 2026 |
| Andrus Property Ltd | Real estate | 2020 |
| Andrus Residence Ltd | Real estate | 2026 |
| Andy Brighton Engineering Services Limited | Professional & scientific | 2020 |
| Anew Medical Aesthetics Norwich Limited | Health & social care | 2018 |
| Anglia Alloys Ltd | Wholesale & retail | 2017 |
| Anglia Bespoke Covers Ltd | Manufacturing | 2019 |
| Anglia Boiler Maintenance Limited | Construction | 2003 |
| Anglia Event Services Limited | Other services | 2024 |