| 10TO2 Limited | Information & communication | 2024 |
| 14425234 Ltd | Extraterritorial | 2022 |
| 1ST Available Freight Limited | Transport & logistics | 1999 |
| 2TMI Ltd | Administrative & support | 2022 |
| 3DCGMETA Limited | Professional & scientific | 2022 |
| 550 Energy Limited | Professional & scientific | 2020 |
| 5DAY (Norwich) Ltd | Education | 2010 |
| 5DAY Intensive Ltd | Education | 2010 |
| 930 Consulting Limited | Professional & scientific | 2015 |
| A & M 24CARE Ltd | Administrative & support | 2018 |
| A D Designer Driveways Limited | Administrative & support | 2020 |
| A Mighty Lamb Production Limited | Arts & recreation | 2024 |
| A&H Accountancy Services Limited | Professional & scientific | 2022 |
| A&O Consultancy Ltd | Health & social care | 2021 |
| A&Rr Limited | Wholesale & retail | 2024 |
| A&St Property Group Limited | Real estate | 2025 |
| A. E. Smith Plumbing & Heating Ltd | Construction | 2026 |
| A.G Grounds Maintenance Limited | Administrative & support | 2022 |
| Abbey Products (Norfolk) Limited | Manufacturing | 1987 |
| Abbeygate Garages Limited | Wholesale & retail | 1976 |
| Abfab Beauty Limited | Other services | 2020 |
| About a Minute Ltd | Administrative & support | 2017 |
| Accounts & Consultancy Ltd | Information & communication | 2025 |
| Active Human Resources Ltd | Administrative & support | 2019 |
| AD Feedstock Ltd | Agriculture & fishing | 2015 |
| Adella Bridal Ltd | Wholesale & retail | 2018 |
| Adon Solution Limited | Health & social care | 2023 |
| ADS Care Limited | Health & social care | 2019 |
| AFM Software Solutions Limited | Information & communication | 1999 |
| AG Norwich Ltd | Other services | 2024 |
| Agellus Projects Limited | Professional & scientific | 2005 |
| Agile Electronics Ltd | Wholesale & retail | 2022 |
| Agora Apex Holdings Limited | Financial services | 2025 |
| Agora Architects Limited | Professional & scientific | 2021 |
| Agrifood Charities Partnership | Professional & scientific | 2008 |
| Agroofing & Homeimprovements Ltd | Manufacturing | 2025 |
| AIJ Stoten Limited | Information & communication | 2015 |
| AJ Infrastructure Consultancy Ltd | Information & communication | 2007 |
| AJH Racing Ltd | Arts & recreation | 2022 |
| AJT Property Solutions Ltd | Real estate | 2023 |
| Akarmous Ltd | Wholesale & retail | 2025 |
| Alcosa Engineering Limited | Construction | 2002 |
| ALL the Tabs Limited | Administrative & support | 2026 |
| Allan Kent Limited | Health & social care | 2022 |
| Allenbrooks Developments Limited | Construction | 1995 |
| Allison Surveying Limited | Professional & scientific | 2019 |
| Altus Retail Consulting Ltd | Professional & scientific | 2025 |
| Aluminium Windows & Doors Limited | Manufacturing | 2006 |
| Alustar Limited | Wholesale & retail | 2005 |
| AM Wedding Services Limited | Wholesale & retail | 2016 |
| Ameliorate Limited | Extraterritorial | 2010 |
| Amiable JAY Ltd | Health & social care | 2016 |
| AMK Tiling Services Ltd | Construction | 2018 |
| Ampersand Holdings Limited | Professional & scientific | 2025 |
| AMY Sutton Ltd | Arts & recreation | 2015 |
| Anas Aldris Limited | Health & social care | 2018 |
| Anbrartis Ltd | Administrative & support | 2024 |
| Ancora Ltd | Health & social care | 2021 |
| Andrei Surveys Ltd | Professional & scientific | 2018 |
| Anglia Garage Equipment Limited | Other services | 1999 |
| Anglian Vipers Rugby League Ltd | Arts & recreation | 2022 |
| Antony Dale Cars Limited | Wholesale & retail | 2013 |
| Apeiron Lawn Care Ltd | Administrative & support | 2019 |
| Apollo Health Collective Pilates Limited | Arts & recreation | 2026 |
| Apollo Recovery & Performance Limited | Health & social care | 2020 |
| Apple Interiors Limited | Construction | 2020 |
| Appletree Bespoke Timber Buildings Limited | Manufacturing | 2010 |
| Aquila Roofing and Construction Ltd | Construction | 2026 |
| AR Krav Maga Self-Defence Training Ltd | Arts & recreation | 2026 |
| Arborvolt Ltd | Administrative & support | 2013 |
| ARC Line Design Ltd | Construction | 2022 |
| Archives of a Storyteller Ltd | Wholesale & retail | 2025 |
| Arise Sports Ltd | Wholesale & retail | 2025 |
| Arnoulds Limited | Other services | 2025 |
| Aroma Health and Beauty Ltd | Other services | 2014 |
| ARS Cars Ltd | Wholesale & retail | 2026 |
| Ashford Developments East Anglia Limited | Construction | 2018 |
| Ashurst Bridge Group Limited | Professional & scientific | 2017 |
| Askstephen App Ltd | Other services | 2026 |
| Askstephen Ltd | Professional & scientific | 2021 |
| Aspheric Limited | Information & communication | 2026 |
| Asset Buccaneer Limited | Information & communication | 2014 |
| Astonishing Beauty Limited | Other services | 2018 |
| Astéri Stat Track Limited | Manufacturing | 2025 |
| ATN Pressure Washers Limited | Administrative & support | 2023 |
| Aurise Performance Ltd | Wholesale & retail | 2025 |
| Aurora Digital Ltd | Information & communication | 2023 |
| Auxology Ltd | Professional & scientific | 2024 |
| Aviform Limited | Manufacturing | 1983 |
| Ayton House Ltd | Real estate | 2014 |
| B.Gray Ltd | Hospitality | 2019 |
| BA Chiropractic Limited | Public administration | 2026 |
| Back in Motion Physiotherapy & Clinical Pilates Limited | Health & social care | 2004 |
| BACK2DESIGN Ltd | Professional & scientific | 2024 |
| Baiboonthaimassage Ltd | Other services | 2023 |
| Baker & Nixon Limited | Administrative & support | 2003 |
| Barking FOX Consult Ltd | Information & communication | 2024 |
| Barking FOX Drinks Company Ltd | Manufacturing | 2024 |
| Barrons Fish Bar Limited | Real estate | 2005 |
| Basil Craske (Norwich) Limited | Construction | 1964 |