| Countryside Grocer Limited | Wholesale & retail | 2024 |
| Coventry Street Investments Ltd | Wholesale & retail | 2025 |
| COX Property Developments Ltd | Households | 2019 |
| Cpbws Ltd | Professional & scientific | 2025 |
| CPS Cleaning Equipment Limited | Manufacturing | 2015 |
| CPT Offshore Services Limited | Manufacturing | 2016 |
| Crackling Limited | Hospitality | 2003 |
| Craft Catering (GY) Limited | Hospitality | 2024 |
| Crassus Holdings Limited | Financial services | 2025 |
| Crazy COW (Barford) Ltd | Hospitality | 2024 |
| CRE8TIVE Flooring Ltd. | Construction | 2011 |
| Create Bespoke Ltd | Manufacturing | 2025 |
| Creation Deco Limited | Other services | 2025 |
| Creative Accounting UK Ltd | Professional & scientific | 2003 |
| Creative Vault Properties Limited | Households | 2024 |
| Creatively Yours Ltd. | Information & communication | 2019 |
| Credo Homes Ltd | Real estate | 2021 |
| Credoworks Limited | Wholesale & retail | 2020 |
| Crespos Arches Restaurant Ltd | Wholesale & retail | 2026 |
| Cribs and Bibs Great Yarmouth Limited | Wholesale & retail | 2017 |
| Cribs and Bibs Party Rooms Limited | Arts & recreation | 2018 |
| Crowe Technical Services Ltd | Professional & scientific | 2025 |
| Crown Dental Care Limited | Health & social care | 2018 |
| Crown Yarmouth Limited | Wholesale & retail | 2024 |
| Crownfison Limited | Real estate | 2025 |
| CRR Rentals Ltd | Real estate | 2026 |
| CRT Performance Parts Limited | Wholesale & retail | 2021 |
| Crystal Palace Amusement Arcade Limited | Arts & recreation | 2025 |
| Csea Services Limited | Manufacturing | 2000 |
| CSH Social Work Consultancy Limited | Health & social care | 2015 |
| CT Shop Essex Limited | Other services | 2018 |
| CTA Developments Limited | Construction | 2014 |
| CTR Engine Specialists Ltd | Manufacturing | 2021 |
| Cttm Limited | Financial services | 1999 |
| Cummings & Goings Taxis Limited | Transport & logistics | 2013 |
| Curtis Press Ltd | Manufacturing | 2019 |
| Cutajar Investments Limited | Real estate | 2024 |
| Cutajar Real Estate Limited | Real estate | 2024 |
| Cutting Edge Garden Design Limited | Administrative & support | 2010 |
| Cvd-Ob Holdings Limited | Financial services | 2024 |
| CW.K9 Limited | Administrative & support | 2025 |
| CWT Engineering Ltd | Construction | 2025 |
| D & a Garage Services Ltd | Wholesale & retail | 2019 |
| D & G Property Rentals Limited | Real estate | 2025 |
| D Arnold Limited | Construction | 2018 |
| D B D Yarmouth Ltd. | Administrative & support | 2002 |
| D F Rope Access & Rigging Ltd | Mining & quarrying | 2025 |
| D G Crewing Limited | Administrative & support | 2020 |
| D Harrison & Sons Builders Limited | Construction | 2023 |
| D J Freight Services Limited | Transport & logistics | 2009 |
| D M King Limited | Construction | 1997 |
| D O'Kane Financial Services Limited | Financial services | 2014 |
| D O'Kane Property Limited | Real estate | 2018 |
| D P S Building & Developments Ltd | Construction | 2021 |
| D&C Prestige Online Ltd | Wholesale & retail | 2024 |
| D&G Field Services Ltd | Manufacturing | 2018 |
| D&Muk Ltd | Construction | 2025 |
| D&S Medical Services Ltd | Health & social care | 2017 |
| D&S Property (England) Ltd | Real estate | 2023 |
| D. C. Hunt Engineers Limited | Manufacturing | 2004 |
| D. Harrison Property Limited | Real estate | 2023 |
| D.P. Leisure Limited | Arts & recreation | 1991 |
| D2 Fire & Security Systems Ltd | Construction | 2026 |
| DA Caravan Services Ltd | Construction | 2015 |
| Dabbrook Engineering Limited | Manufacturing | 2016 |
| Daily Renovating Limited | Construction | 2023 |
| Dalmafiu Ltd | Education | 2016 |
| DAM Property Consultancy Limited | Households | 2018 |
| Damp Co (EA) Ltd | Construction | 2025 |
| Damp Control (EA) Ltd | Construction | 2025 |
| DAN Crawley Limited | Financial services | 2023 |
| Danielle High Limited | Administrative & support | 2024 |
| Danny Ansell Properties Limited | Real estate | 2017 |
| Danny Marine Service Limited | Transport & logistics | 2026 |
| Danrik Properties Limited | Real estate | 2011 |
| DAP Management Solutions Limited | Professional & scientific | 2020 |
| Daph Engineering Ltd | Professional & scientific | 2024 |
| Darby & Liffen Limited | Real estate | 1964 |
| Darby Services Ltd | Mining & quarrying | 2026 |
| Darius Balciunas Ltd | Construction | 2023 |
| Darkan Limited | Professional & scientific | 2011 |
| Dart Gear Ltd | Other services | 2025 |
| Datra Property Investment Limited | Real estate | 2016 |
| Datra Serviced Accommodation Limited | Hospitality | 2017 |
| Dave Oliver Hydrographic Services Limited | Administrative & support | 1989 |
| Davfisy D Developer Limited | Construction | 2019 |
| David Girling Drilling Consultant Limited | Construction | 2012 |
| David Neve Holdings Limited | Financial services | 2016 |
| David Palmer (East Anglia) Limited | Construction | 2013 |
| David Plume Limited | Construction | 2012 |
| David Storm Building Services Ltd | Construction | 2025 |
| David Wells ODP Ltd | Health & social care | 2022 |
| Davoli Construction Recruitment Limited | Administrative & support | 2024 |
| DAW Technologies Limited | Professional & scientific | 2024 |
| Dawson Offshore Limited | Mining & quarrying | 2011 |
| DB Properties (Great Yarmouth) Ltd | Real estate | 2020 |
| Dbbuilders & Groundworks Ltd | Construction | 2021 |
| Dbs-Projects Ltd | Construction | 2017 |
| DCG Enterprise Limited | Construction | 2025 |
| DCS1 Ltd | Real estate | 2022 |