| 04871850 Ltd | Construction | 2003 |
| 121 Computers Limited | Extraterritorial | 2006 |
| 144 Thorpe Road (Norwich) Management Company Limited | Hospitality | 2005 |
| 149 and 150 Bells Road Management Company Limited | Real estate | 2023 |
| 21ST Century Software Limited | Professional & scientific | 1983 |
| 24/7 Recover ME Ltd | Transport & logistics | 2023 |
| 2W (Norfolk) Limited | Real estate | 2006 |
| 3 C Investments Limited | Construction | 1987 |
| 36 Northgate Management Company Limited | Households | 2000 |
| 4 Shore Developments Limited | Wholesale & retail | 2000 |
| 46 King Street Limited | Households | 2008 |
| 4TH Millennium Systems Limited | Information & communication | 1996 |
| 777 Global Foundation CIC | Professional & scientific | 2024 |
| 90 Stone Road Management Company Limited | Professional & scientific | 1991 |
| A & K Lillig Limited | Construction | 2003 |
| A & M Shoes Limited | Wholesale & retail | 2006 |
| A Burton Builders Limited | Construction | 2007 |
| A C Leigh (Security) Limited | Professional & scientific | 2007 |
| A E Thomson Limited | Financial services | 2003 |
| A G R Interiors Limited | Construction | 1981 |
| A M Group Limited | Extraterritorial | 1962 |
| A M Ryan Limited | Other services | 2002 |
| A S Motorsport Limited | Manufacturing | 2007 |
| A&J Boutique Ltd | Wholesale & retail | 2023 |
| A. & I. Rowlands Limited | Manufacturing | 1980 |
| A. Sharman & Sons (Construction) Limited | Construction | 1972 |
| A.B. Cave (Nurseries) Limited | Agriculture & fishing | 1947 |
| A.E. Rice & Co. Limited | Wholesale & retail | 1956 |
| A.F.R. Degouveia Co. Limited | Hospitality | 1974 |
| A.G.T. Technical Services Limited | | 1988 |
| A.L. Legge & SON Limited | Agriculture & fishing | 1986 |
| A.R.Wilson Limited | Agriculture & fishing | 1940 |
| A.V.Youngs(Farms)Limited | Agriculture & fishing | 1959 |
| Abeln Limited | Health & social care | 2007 |
| About Thetford Ltd | Manufacturing | 2006 |
| ACA Services (EA) Ltd | Manufacturing | 2011 |
| Acciobiz Ltd | Information & communication | 2008 |
| Ace Draincare & Groundworks Ltd | Construction | 2001 |
| Ace Garage Doors UK Limited | Construction | 2004 |
| ACTIV-8 Adventure Ltd | Arts & recreation | 2004 |
| Active Life Physiotherapy Limited | Health & social care | 2003 |
| Adcock & Sons Limited | Wholesale & retail | 1963 |
| Adfirmo Limited | Professional & scientific | 2004 |
| Advanced Diagnostic Services (UK) Ltd | Health & social care | 2005 |
| Advantage Rugby CIC | Arts & recreation | 2023 |
| AE Operations Ltd | Professional & scientific | 2007 |
| AES Logistics Ltd | Transport & logistics | 2003 |
| AGE Concern North Norfolk | Health & social care | 2003 |
| Agricultural Trading Systems Ltd. | Information & communication | 1997 |
| AJD Auto Repairs Limited | Wholesale & retail | 2002 |
| Ajrp Norfolk Ltd | Hospitality | 2024 |
| AKE Scaffolding Limited | Construction | 2007 |
| Alan Harris Engineering Limited | Wholesale & retail | 2006 |
| Alan R Cross & SON Ltd | Manufacturing | 2002 |
| Albany Court (Cromer) Freehold Limited | Households | 2004 |
| Albion Laboratories Ukeig | Agriculture & fishing | 1995 |
| Albrow & Sons Limited | Wholesale & retail | 2004 |
| Alcor Developments (Thorpe) LLP | | 2007 |
| Allison Bathroom & Shower Centre Limited | Wholesale & retail | 2002 |
| Allman Woodcock Limited | Professional & scientific | 2003 |
| Alpign Services Limited | Professional & scientific | 2006 |
| Alpington Development Land Two Limited | Construction | 2026 |
| ALSPED65 Ltd | Transport & logistics | 2019 |
| Alto Music Retail PLC. | Transport & logistics | 1990 |
| AM Landscapes & Maintenance Limited | Administrative & support | 2007 |
| Ames Nissan Limited | Wholesale & retail | 1993 |
| Ananthan.V.Ss Ltd | Wholesale & retail | 2024 |
| Anchor Park Limited | Administrative & support | 2009 |
| Anchor Park the Garden Village Ltd | Extraterritorial | 2020 |
| Anderson Newton Partnership Ltd | Information & communication | 2000 |
| Andrew Brown Ltd | Wholesale & retail | 2002 |
| Andrew Donaldson Limited | Hospitality | 1957 |
| Andy Kemp Ltd | Manufacturing | 2018 |
| Andy's Imports Limited | Wholesale & retail | 2003 |
| Anglia Access Platforms Ltd | Extraterritorial | 2006 |
| Anglia Maltings Limited | Extraterritorial | 1979 |
| Anglia Restaurants Ltd | Hospitality | 1998 |
| Anglia Shopfitting (Norwich) Limited | Manufacturing | 1992 |
| Anglian Architectural Limited | Manufacturing | 2002 |
| Anglian Fencing Limited | Construction | 2003 |
| Anish Retailers Ltd | Wholesale & retail | 2019 |
| Anoca Limited | Information & communication | 1986 |
| APV Consultants Limited | Real estate | 2003 |
| Araby Property Investments Limited | Real estate | 2007 |
| Arborsolve Limited | Agriculture & fishing | 2002 |
| ARK Animal Services Limited | Professional & scientific | 2007 |
| ARK Creative (UK) Limited | Information & communication | 2005 |
| Arkul Ltd | Real estate | 2026 |
| Arnall Capps Limited | | 1941 |
| Arpels Inc Ltd | Professional & scientific | 2007 |
| Arthur Jary & Sons Limited | Other services | 1951 |
| Ashanti Solutions Limited | Real estate | 2023 |
| Ashleigh Print & Design Limited | Manufacturing | 1998 |
| Ashley Property England Limited | Real estate | 2025 |
| Ashton & Co (Diss) Limited | Real estate | 2007 |
| Asset Training Limited | Education | 2007 |
| Aston Financial Services Limited | Financial services | 2005 |
| Athena FM Facilities Management and Property Services Limited | Professional & scientific | 2010 |
| Atherstone Motor Company Limited | | 1966 |
| Attleborough Service Centre Limited | Wholesale & retail | 2004 |