| Brazenhead Limited | Wholesale & retail | 1999 |
| Brian Coleman Enterprises Limited | Manufacturing | 1994 |
| Brick Kilns Barney Limited | Hospitality | 2014 |
| Brilliant Lawns Limited | Administrative & support | 2012 |
| Brown's Machinery Limited | Administrative & support | 2026 |
| Bruce Towers and Sons Limited | Construction | 2010 |
| Bryan Williams of Letheringsett Ltd. | Construction | 1998 |
| BST Medic Services Ltd | Other services | 2013 |
| BTK Courier Limited | Transport & logistics | 2026 |
| BTP Electrical & Renewables Limited | Construction | 2020 |
| Bunkers Hill Pigs Ltd | Agriculture & fishing | 2015 |
| Bunting & SON Limited | Construction | 2004 |
| Burch Power Limited | Professional & scientific | 2014 |
| Burgate Exploration & Production Ltd | Mining & quarrying | 2010 |
| Burnham Market Trading Company Limited | Real estate | 2020 |
| Burnham Willow Limited | Manufacturing | 2005 |
| Butcher Andrews LLP | | 2018 |
| Buyers Surveys Ltd | Professional & scientific | 2024 |
| C & R Roofing LLP | | 2019 |
| C & S Builders LLP | | 2019 |
| C J Yardley Landscape Survey & Design LLP | | 2019 |
| C R Carpentry & Construction Limited | Manufacturing | 2016 |
| C. D. Cole Contracting (Norfolk) Limited | Agriculture & fishing | 2007 |
| C.K. Caravan Services Limited | Other services | 2002 |
| C.R. Stark Limited | Construction | 2002 |
| C.T. Brown & Co. Limited | Agriculture & fishing | 1988 |
| Cafe Nelson Fakenham Limited | Hospitality | 2026 |
| Cafe Nelson Limited | Hospitality | 2019 |
| Caladrius Medical Solutions Ltd | Health & social care | 2023 |
| Calmlee Ltd | Health & social care | 2024 |
| Campaign Strategy Limited | Administrative & support | 2003 |
| Carben Construction Limited | Construction | 2002 |
| Carcanet Media Limited | Professional & scientific | 2004 |
| Carcanet Property Limited | Financial services | 2019 |
| Care Elements Limited | Health & social care | 2023 |
| Carl Fairbrother Lettings Ltd | Real estate | 2023 |
| Carrylicious Ltd | Manufacturing | 2018 |
| Carshuffle Ltd | Wholesale & retail | 2024 |
| Ccph Ltd | Construction | 2015 |
| CEA Agriculture Ltd | Real estate | 2024 |
| Cerberus UK Consulting Ltd. | Professional & scientific | 2013 |
| Certa Cito Properties Ltd | Real estate | 2023 |
| Charles Barr Furniture Limited | Manufacturing | 1992 |
| Chemanglia Limited | Manufacturing | 2010 |
| Chemspec (East Anglia) Limited | Agriculture & fishing | 2000 |
| Chemspec Advisory LLP | | 2014 |
| Chemspec Holdings Limited | Financial services | 2025 |
| Chiltern AD Management Ltd | Energy | 2017 |
| Chris GUY Accounting Services Ltd | Professional & scientific | 2019 |
| Christopher Buxton Ltd. | Households | 2025 |
| CI Leisure Limited | Hospitality | 2025 |
| CJ Ringwood Controls Limited | Construction | 1999 |
| Claire Howard Jewellery Ltd | Manufacturing | 2025 |
| Clan Ardoch Ltd | Hospitality | 2021 |
| Clark and Sons (Fakenham) Ltd | Wholesale & retail | 2014 |
| Claxton Hall Architectural Limited | Professional & scientific | 2013 |
| Cluster Landscape Connect C.I.C. | Administrative & support | 2025 |
| Coal Shack Limited | Wholesale & retail | 2024 |
| Colabora Limited | Professional & scientific | 2025 |
| Colin Marshall & SON Limited | Manufacturing | 2008 |
| Colman Ventures Ltd | Construction | 2026 |
| Compton Hall Pigs Ltd | Agriculture & fishing | 2016 |
| Conservation Shop Limited(The) | Wholesale & retail | 1986 |
| Constructionxai Ltd | Information & communication | 2025 |
| Coolstatus Limited | Administrative & support | 2006 |
| Country Services Fencing Limited | Construction | 2009 |
| Countryside Filling Station Limited | Wholesale & retail | 2001 |
| Countywide Joinery Limited | Construction | 2012 |
| CRA (Commerce) Limited | Real estate | 1993 |
| Craft Leisure Limited | Transport & logistics | 2005 |
| Craigie Mains Limited | Professional & scientific | 1991 |
| Cranmer Estates Norfolk Ltd | Agriculture & fishing | 2025 |
| Cranmer Farm LLP | | 2008 |
| Creative Chiropractic Ltd | Health & social care | 2007 |
| Cressida Bonas Limited | Arts & recreation | 2015 |
| Crisp Malting Group Limited | Extraterritorial | 1979 |
| Cristal Barbers Limited | Other services | 2017 |
| Cristal Hair & Beauty Limited | Other services | 2011 |
| CRL Transport Ltd | Transport & logistics | 2022 |
| Croccomps Ltd | Wholesale & retail | 2021 |
| Cromer Voluntary Entertainments Organisation Limited | Other services | 1983 |
| Crook DE Lyon Ltd. | Administrative & support | 1999 |
| Crumble Crib Ltd | Hospitality | 2024 |
| D Thompson Chimneys Ltd. | Administrative & support | 2002 |
| D-TAG7 Limited | Professional & scientific | 2010 |
| DAC Leasing Limited | Wholesale & retail | 1984 |
| DAC Technology Ltd | Wholesale & retail | 2011 |
| Daco Construction Holdings Limited | Real estate | 2019 |
| Dahle Limited | Professional & scientific | 2021 |
| Daisy Amelia Limited | Arts & recreation | 2008 |
| Daly (Group) Limited | Construction | 2005 |
| Daniel Grocott & Jack Boyce Limited | Financial services | 2026 |
| Daniel Grocott & Jody Murfit Limited | Financial services | 2026 |
| Darlows Transport Ltd | Transport & logistics | 2022 |
| Dashmir Properties Ltd | Real estate | 2025 |
| Datamaven Information Services Limited | Information & communication | 2025 |
| David Brient UK Ltd | Professional & scientific | 2013 |
| Davmar Limited | Other services | 2016 |
| DAYO01 Limited | Financial services | 2021 |
| DB Groundworks and Construction Ltd | Construction | 2020 |