| CJJ ARB Associates Ltd | Agriculture & fishing | 2022 |
| CJM Construction Management Ltd | Construction | 2024 |
| CJM Dwellings Limited | Real estate | 2021 |
| CJM Investing Ltd | Real estate | 2022 |
| CJM Services (Norfolk) Ltd | Transport & logistics | 2024 |
| Cjmortho Limited | Health & social care | 2019 |
| CJN Holdings Ltd | Administrative & support | 2021 |
| CJNO.7AESTHETICS Ltd | Other services | 2022 |
| CJR Home Improvements Ltd | Construction | 2024 |
| CJR Technical Services Limited | Professional & scientific | 2012 |
| CJS Engagement 2 Ltd | Professional & scientific | 2021 |
| CJS Management Services Limited | Professional & scientific | 2014 |
| CJS Plastering (NFK) Ltd | Construction | 2017 |
| CJS Tech Ventures Limited | Information & communication | 2025 |
| CJW Consultancy (Herts) Ltd | Professional & scientific | 2025 |
| CJW Property Maintenance Services Ltd | Other services | 2019 |
| CK Care Limited | Health & social care | 2014 |
| CK Handling Ltd | Transport & logistics | 2025 |
| CKA Healthcare Ltd | Administrative & support | 2024 |
| CKM Electrical Services Limited | Energy | 2018 |
| CKM Sales Ltd | Wholesale & retail | 2023 |
| Cl-Architecture Limited | Professional & scientific | 2017 |
| Cla-Log Ltd | Hospitality | 2018 |
| Clacton Family Trust Limited | Health & social care | 1997 |
| Cladding Solutions Stafford Ltd | Construction | 2017 |
| Cladspray Solutions Ltd | Construction | 2013 |
| Claim and Legal Consultants Ltd | Professional & scientific | 2019 |
| Claire Carney Floral and Balloon Designs Ltd | Wholesale & retail | 2023 |
| Claire Coles Ltd | Arts & recreation | 2013 |
| Claire Creed Mortgages Ltd | Financial services | 2022 |
| Claire Watson Legal Limited | Professional & scientific | 2026 |
| Clan Farms Limited | Agriculture & fishing | 1954 |
| Clancy Take Away Ltd | Hospitality | 2017 |
| Clancys Plumbing & Heating Limited | Construction | 2018 |
| Clapham & Collinge LLP | | 2012 |
| Clar Quality Service Ltd | Wholesale & retail | 2025 |
| Clarabelle Care Services Limited | Extraterritorial | 2022 |
| Clarandanbia Ltd | Extraterritorial | 2017 |
| Claren Motor Trade Ltd | Wholesale & retail | 2026 |
| Claren's Food and Wine Ltd | Wholesale & retail | 2013 |
| Clarence Benjamin International Ltd | Manufacturing | 2022 |
| Clarence Lodge (Great Yarmouth) Limited | Health & social care | 2009 |
| Clarendon House (Norwich) Ltd | Real estate | 2022 |
| Clarges Street (Flat 17) Limited | Real estate | 2025 |
| Clarice Leisure Limited | Health & social care | 1997 |
| Clarick Cleaning Ltd | Administrative & support | 2013 |
| Claridech Limited | Construction | 2002 |
| Clarification Time Ltd | Extraterritorial | 2021 |
| Clarion Corvus Trust | Education | 2013 |
| Clarion Light Ltd | Health & social care | 2026 |
| Clarity Partnership Limited | Professional & scientific | 2014 |
| Clark James Norwich Limited | Administrative & support | 2011 |
| Clark Projects Ltd | Real estate | 2019 |
| Clark ST. James Limited | Information & communication | 2013 |
| Clark-Vinall Homes Limited | Real estate | 2024 |
| Clarke & Cooper Ltd | Administrative & support | 2015 |
| Clarke Accountancy Limited | Real estate | 2016 |
| Clarke Engineering Services Ltd | Professional & scientific | 2022 |
| Clarke Farms (Isleham) Limited | Agriculture & fishing | 2007 |
| Clarke Property Development Limited | Construction | 2009 |
| Clarkes Quality Meats (Hevingham) Limited | Wholesale & retail | 2003 |
| Class Norfolk Limited | Education | 2019 |
| Classic Cafes Ltd | Hospitality | 2025 |
| Classic Car Property Ltd | Real estate | 2022 |
| Classic Car Restorations (East Anglia) Limited | Wholesale & retail | 2023 |
| Classic Coaching Consultants Limited | Extraterritorial | 2020 |
| Classic Event Chair Covers Ltd | Administrative & support | 2014 |
| Classic Flying Machine Collection Limited | Manufacturing | 2000 |
| Classic Furniture Designers Ltd | Professional & scientific | 2010 |
| Classic Investments & Restorations Ltd | Wholesale & retail | 2024 |
| Classic Racing Motorcycle Club Limited | Arts & recreation | 1987 |
| Classic Wings and Wheels Limited | Extraterritorial | 2010 |
| Classicbuyer Ltd | Wholesale & retail | 2019 |
| Classics International Ltd | Administrative & support | 2016 |
| Classicway Ventures Ltd | Hospitality | 2024 |
| Classy Agreements Ltd | Extraterritorial | 2022 |
| Claven Property Limited | Real estate | 2017 |
| Claxton Mcmullan Holdings Ltd | Administrative & support | 2022 |
| Claxton Mill Residents Association Limited | Households | 1996 |
| Claxtonbird Residential Ltd | Real estate | 2016 |
| Clay Station Developments Limited | Professional & scientific | 1997 |
| Clayson Properties Limited | Real estate | 2026 |
| CLD (Worldwide) Ltd | Information & communication | 2020 |
| CLD Accounting & Taxation Limited | Professional & scientific | 2020 |
| Clean & DRY Services Limited | Other services | 2003 |
| Clean Norfolk Ltd | Administrative & support | 2014 |
| Clean Peaks Ltd | Administrative & support | 2019 |
| Clean Power Generation Limited | Energy | 2011 |
| Cleaning Inside and OUT Ltd | Administrative & support | 2018 |
| Cleaning Wizards UK Limited | Other services | 2008 |
| Cleanngreen Waste Ltd | Water & waste | 2025 |
| Cleanvista Ltd | Administrative & support | 2019 |
| Clear AI Ltd | Information & communication | 2018 |
| Clear AS Crystal Ltd | Administrative & support | 2019 |
| Clear Consulting and Design Ltd | Professional & scientific | 2015 |
| Clear Display Ltd | Wholesale & retail | 2009 |
| Clear Divisions Limited | Construction | 2022 |
| Clear Graphics Holdings Limited | Professional & scientific | 2007 |
| Clear Graphics Limited | Arts & recreation | 1991 |
| Clear Hear Healthcare Limited | Health & social care | 2024 |