| 1-2MOT.COM Ltd | Wholesale & retail | 2020 |
| 1CI Holdings Limited | Financial services | 2021 |
| 1CI Properties Limited | Real estate | 2022 |
| 1ST Choice Insulations Ltd | Construction | 2005 |
| 1ST Class Cars Limited | Wholesale & retail | 2018 |
| 20092020 Limited | Professional & scientific | 2022 |
| 342 Consulting Limited | Professional & scientific | 2015 |
| 3B Developments Ltd | Construction | 2020 |
| 3B Fire Consultancy Ltd | Professional & scientific | 2019 |
| 3JD Consultants Ltd | Professional & scientific | 2022 |
| 4 Leaf Batteries Limited | Wholesale & retail | 2000 |
| 5678LMR (Norwich) RTM Company Limited | Households | 2023 |
| 5X Fibre Ltd | Construction | 2025 |
| 80 Greengate Management Limited | Households | 2010 |
| A & I Car Wash Ltd | Wholesale & retail | 2021 |
| A & O Industries Ltd | Construction | 2022 |
| A & P Takeaway Ltd | Hospitality | 2019 |
| A & R Fabrications Limited | Manufacturing | 2011 |
| A - Z Communications Solutions Ltd | Professional & scientific | 2012 |
| A D Building (Property) Services Ltd | Construction | 2018 |
| A D Electrical Contracting Ltd | Construction | 2007 |
| A E D Partners Ltd | Wholesale & retail | 2015 |
| A J N Multi-Services Limited | Other services | 2007 |
| A P Gooch Limited | Construction | 2008 |
| A Plus Recovery and Repairs Ltd | Manufacturing | 2017 |
| A S Glazing Services Ltd | Other services | 2022 |
| A Time to Breathe Limited | Arts & recreation | 2015 |
| A&B Construction (EA) Ltd | Construction | 2020 |
| A&Sh Catering Ltd | Hospitality | 2022 |
| A. Chalmers Ltd | Professional & scientific | 2026 |
| A. Hudson Builders Limited | Construction | 2013 |
| A. Royden Roofing Services Limited | Construction | 2010 |
| A. W. Myhill & SON Limited | Wholesale & retail | 1986 |
| A1 Home Improvements Limited | Construction | 2006 |
| A2E Environmental Solutions Limited | Wholesale & retail | 2007 |
| AA Dispatch (UK) Limited | Transport & logistics | 2007 |
| AB Home & Garden Services Ltd | Construction | 2025 |
| Abeltronics Limited | Manufacturing | 2012 |
| Acare Services Limited | Manufacturing | 2002 |
| Accelerate Personnel Ltd | Administrative & support | 2021 |
| Accomleisure Limited | Hospitality | 2015 |
| Accurate Designs Limited | Administrative & support | 2008 |
| Ace Taxis (Norfolk) Limited | Transport & logistics | 2016 |
| Acmatic Networks Limited | Information & communication | 2022 |
| Acorn Drive Management Ltd | Households | 2021 |
| ACR Trading (UK) Limited | Wholesale & retail | 2022 |
| Acuere Limited | Education | 2019 |
| Acuity Video Ltd | Professional & scientific | 2018 |
| Adam Ferguson Decorating Limited | Construction | 2017 |
| ADD 2 Builders Limited | Construction | 2006 |
| ADM Careplan Limited | Construction | 2015 |
| ADM Plumbing, Heating & Electrical Limited | Administrative & support | 2013 |
| ADM Surfacing Ltd | Construction | 2026 |
| ADP Accounting Limited | Professional & scientific | 2008 |
| Aero Luff Spars Ltd | Manufacturing | 2019 |
| Affinity Associates (EA) Limited | Professional & scientific | 2017 |
| Affinity Enterprises Limited | Education | 2025 |
| AG Broadcast Ltd | Information & communication | 2021 |
| Agri Nova Ltd | Financial services | 2018 |
| Agristruct Limited | Construction | 2025 |
| AJ Cruz Buck Limited | Financial services | 2023 |
| AJB Operations Ltd | Hospitality | 2025 |
| AJF Homes & Developments Limited | Real estate | 2024 |
| AJH Driving Services Limited | Transport & logistics | 2010 |
| AJN Repairs Limited | Other services | 2024 |
| AKC Streetworks Ltd | Construction | 2014 |
| Al-Huda Islamic Center | Other services | 2022 |
| Alan Howard Limited | Professional & scientific | 1994 |
| Alcidae Consulting Ltd | Professional & scientific | 2024 |
| Alder Lodge Court Ltd | Real estate | 2020 |
| Alderhill Limited | Agriculture & fishing | 2005 |
| Alex Jason Limited | Administrative & support | 2003 |
| ALH Building Services Design Ltd | Professional & scientific | 2011 |
| ALL Eyes Marketing Ltd | Professional & scientific | 2020 |
| Alma Residential Property Ltd | Real estate | 2018 |
| Alpha 7 Motorsport Ltd | Wholesale & retail | 2022 |
| Alpha Properties (East Anglia) Limited | Real estate | 2024 |
| Alpha Surveys (East Anglia) Holdings Limited | Financial services | 2024 |
| Alpha Surveys (East Anglia) Ltd | Professional & scientific | 2021 |
| Ambition Community Healthcare Ltd | Health & social care | 2018 |
| AMJ Recruitment Group Ltd | Administrative & support | 2021 |
| AMK Exteriors Ltd | Administrative & support | 2025 |
| Amorphous Technologies Limited | Manufacturing | 2019 |
| AMP & Deck Events Ltd | Administrative & support | 2021 |
| Amtag Ltd | Information & communication | 2022 |
| Andre's Moments That Matter CIC | Health & social care | 2026 |
| Andrew Boyle Carpentry Limited | Construction | 2015 |
| Andrew Lewis Consultancy Ltd | Administrative & support | 2017 |
| Andrew Pearson Training Services Limited | Administrative & support | 2016 |
| Andy’S Valeting Centre Ltd | Administrative & support | 2026 |
| Anglia Diamond Heating Services Limited | Construction | 2011 |
| Anglia Kitchens & Bedrooms Limited | Wholesale & retail | 1996 |
| Anglia Operator Services Ltd | Construction | 2015 |
| Anglian Erection Services Limited | Construction | 1988 |
| Anglian Health Ltd | Financial services | 2020 |
| Anglian Marine Investments Limited | Financial services | 2026 |
| Anglian Solutions Ltd | Wholesale & retail | 2016 |
| Anglian Wealth Management Limited | Extraterritorial | 2009 |
| Anglorum Limited | Administrative & support | 2017 |
| Angnet Ltd | Information & communication | 2025 |