| Brittons Estate Agents Limited | Real estate | 2003 |
| Brosch Direct Holdings Limited | Health & social care | 2010 |
| Brush Property Solutions Limited | Construction | 2011 |
| Bulldog Sunbeds Limited | Other services | 2024 |
| Bunting Build Ltd | Extraterritorial | 2013 |
| Burnham Overy Boathouse Limited | Manufacturing | 1958 |
| Burrows & Howes Ltd | Other services | 2005 |
| Burrows Joinery Limited | Manufacturing | 2003 |
| C H Edwards Decorating Ltd | Construction | 2015 |
| C K Fisher Ltd | Professional & scientific | 2014 |
| C.& R.Cinemas Limited | Information & communication | 1968 |
| C.F.Case & Co.Limited | Agriculture & fishing | 1954 |
| Calderwood Communication Limited | Administrative & support | 2010 |
| Camro Trading International Ltd | Administrative & support | 2017 |
| Captain Fawcett Limited | Other services | 2011 |
| Cardrome Mobile Limited | Wholesale & retail | 2025 |
| Cares Training Ltd | Education | 2024 |
| Carlita Cafe Bar Mercearia Ltd | Hospitality | 2022 |
| Carter Haulage and Storage (Norfolk) Limited | Transport & logistics | 1995 |
| CBL Lettings Limited | Real estate | 2025 |
| CDR Services Limited | Wholesale & retail | 2019 |
| Ceat Trading Limited | Professional & scientific | 2005 |
| CF Holdings (Wisbech) Limited | Real estate | 2022 |
| Chalk Farm Clay Ground Ltd | Arts & recreation | 2019 |
| Cheveley Productions Limited | Extraterritorial | 1983 |
| Childs Play Day Nursery (Norfolk) Ltd | Education | 2026 |
| China Foodie Ltd | Hospitality | 2024 |
| CHM Fenland Properties Limited | Real estate | 2026 |
| Church Associates Limited | Professional & scientific | 2012 |
| Citrus Investments Limited | Real estate | 1969 |
| Clements Flooring and Blinds Ltd | Wholesale & retail | 2019 |
| Clipbush Business Park Management Company Limited | Households | 2007 |
| Clive Walker Contracting Ltd | Administrative & support | 2014 |
| Club 8 Ltd | Wholesale & retail | 2017 |
| CM Forage Ltd | Agriculture & fishing | 2025 |
| CME Landscaping Ltd | Construction | 2022 |
| Coastal Vets Limited | Professional & scientific | 2012 |
| Coastline Car Sales Limited | Wholesale & retail | 2018 |
| Coates Bros Contractors Limited | Real estate | 1999 |
| Cobb Real Estate Ltd | Real estate | 2025 |
| Collison and Dowe Ltd | Construction | 2011 |
| Collison CUT Flowers Ltd | Agriculture & fishing | 2021 |
| Commerce Pilot Ltd | Information & communication | 2020 |
| Commodity Inspections Ltd | Professional & scientific | 2010 |
| Complete Garage Doors Norfolk Ltd | Construction | 2023 |
| Congham Farms Limited | Agriculture & fishing | 2001 |
| Connaught Media Limited | Extraterritorial | 2016 |
| Construck Limited | Construction | 2022 |
| Contract Fencing and Landscaping Ltd | Administrative & support | 2023 |
| Cooks Tools Ltd | Wholesale & retail | 2022 |
| Coparek Limited | Construction | 1988 |
| COS Office Supplies Limited | Wholesale & retail | 2015 |
| Cruso and Wilkin Limited | Real estate | 2019 |
| Cruso Wilkin Auctions & Management | Real estate | 1984 |
| Csln Group Ltd | Information & communication | 2023 |
| CTM Property Holdings Limited | Real estate | 2020 |
| Cubelife Conversions Ltd | Manufacturing | 2025 |
| Custom Build Norfolk Ltd | Construction | 2013 |
| CV Systems Ltd | Professional & scientific | 2010 |
| CWS Holdings Limited | Wholesale & retail | 2006 |
| D & E Builders Limited | Construction | 2003 |
| D & J Plumbing & Electrical Limited | Construction | 2011 |
| D G Scales Plant Hire Limited | Construction | 2004 |
| D L Landscapes Ltd | Administrative & support | 2002 |
| D-Teks (Kings Lynn) Ltd | Wholesale & retail | 2010 |
| Dale Sheetmetal Limited | Manufacturing | 1986 |
| Danny Pressland Limited | Construction | 2015 |
| Darsh Gupta Ltd | Administrative & support | 2022 |
| Daucina Charters Ltd | Agriculture & fishing | 2017 |
| David Trundley Design Services Limited | Professional & scientific | 1995 |
| DB Property Development Limited | Real estate | 2009 |
| Dcsa Ltd | Financial services | 2024 |
| DE Equestrian Ltd | Wholesale & retail | 2021 |
| Dedicated Care East Anglia Limited | Health & social care | 2013 |
| Dedicated Care Ltd | Other services | 2018 |
| Defama Associates Ltd | Professional & scientific | 2006 |
| Delamore Properties Limited | Real estate | 2007 |
| Divinus Healthcare Ltd | Health & social care | 2025 |
| DJR Carpentry Limited | Construction | 2003 |
| DJR Rentals Ltd | Real estate | 2021 |
| DOC Line World Limited | Extraterritorial | 2006 |
| Docherty Roofing and Cladding Limited | Construction | 2019 |
| Dodman Limited | Manufacturing | 1991 |
| Doubleday's Transport Ltd. | Transport & logistics | 1996 |
| DP Automotive Upholstery Ltd | Wholesale & retail | 2021 |
| DPH Construction Services Ltd | Professional & scientific | 2017 |
| DPP Africa Consultancy Limited | Information & communication | 2025 |
| DR Bilku Limited | Real estate | 2019 |
| Drewery and Reynolds (Commercials) Limited | Wholesale & retail | 1965 |
| Drills N Frills Limited | Professional & scientific | 2017 |
| Drnarc Ltd | Health & social care | 2015 |
| DS Developments (Norfolk) Limited | Construction | 2015 |
| Duleba Enterprises Limited | Professional & scientific | 2003 |
| DWELLINGS4U Limited | Construction | 2017 |
| E & D Solutions Limited | Wholesale & retail | 2011 |
| E & J Automotive Repairs Ltd | Wholesale & retail | 2022 |
| E W Bell Farms Limited | Agriculture & fishing | 2020 |
| E.A.S. (Plant Hire) Limited | Mining & quarrying | 1998 |
| Earth 1 Pet Food Ltd | Manufacturing | 2024 |
| East Coast Signs Limited | Manufacturing | 2008 |