| Chris Elms Ltd | Information & communication | 2024 |
| Chris Simpson Designs Ltd | Manufacturing | 2025 |
| Christchurch Aesthetics Ltd | Wholesale & retail | 2022 |
| Christchurch International Consulting Ltd | Professional & scientific | 2019 |
| Christchurch Optical Ltd | Health & social care | 2023 |
| Christie Cluett Consulting Ltd | Administrative & support | 2021 |
| Christopher Construction Services Limited | Real estate | 1997 |
| Christopher Norton Limited | Agriculture & fishing | 2015 |
| Chromauric Limited | Manufacturing | 2025 |
| Chronon Consulting Ltd | Information & communication | 2021 |
| CHS Landscapes Ltd | Administrative & support | 2021 |
| CHS Properties (International) Ltd | Real estate | 2023 |
| Churbide Limited | Real estate | 2022 |
| Church Hill Court (Management Company) Limited | Households | 2001 |
| Church Street Car Park Ltd | Households | 2016 |
| Church Street Corporate Solutions LLP | | 2011 |
| Churchview Joinery Limited | Manufacturing | 2012 |
| Churn Way Solutions Ltd | Information & communication | 2023 |
| CHW Building Consultancy Ltd | Professional & scientific | 2012 |
| Ciaas Limited | Information & communication | 2022 |
| Ciderlake Limited | Information & communication | 2024 |
| Cindy LOI Limited | Professional & scientific | 2025 |
| Cinemattag Productions Ltd | Professional & scientific | 2013 |
| Cintelli Limited | Professional & scientific | 2017 |
| Circular Pictures Ltd. | Information & communication | 2001 |
| Circular Quay Consulting Ltd | Information & communication | 2019 |
| Cirel Ltd | Agriculture & fishing | 2017 |
| Citadel Products Limited | Manufacturing | 1970 |
| Citiit Limited | Information & communication | 2024 |
| City & Central Services Limited | Real estate | 1994 |
| CJ AI Ltd | Professional & scientific | 2022 |
| CJB ( Wimborne) Ltd | Other services | 2019 |
| CJB Consulting London Limited | Professional & scientific | 2024 |
| CJB Testing Ltd | Information & communication | 2018 |
| CJM Cars (UK) Limited | Wholesale & retail | 2013 |
| CJN Properties Limited | Households | 1997 |
| CJP Limited | Other services | 1997 |
| CJP Technical Limited | Professional & scientific | 2022 |
| Cjrj Consultancy Limited | Construction | 2025 |
| CJS Fabrications Limited | Manufacturing | 2013 |
| CJW Engineered Solutions Limited | Construction | 2021 |
| CK10 Ltd | Financial services | 2017 |
| CK3 Group Trading Limited | Real estate | 2018 |
| CK5 Limited | Professional & scientific | 2018 |
| CKG Ceramics Ltd | Manufacturing | 2019 |
| CKS Scientific Limited | Manufacturing | 2019 |
| Clabon Consulting Ltd | Information & communication | 2021 |
| Clad Sure Ltd | Construction | 2023 |
| Claridge Consulting Ltd | Professional & scientific | 2022 |
| Clarifeye Ltd | Health & social care | 2026 |
| Clark Business Coaching Limited | Professional & scientific | 2015 |
| Clark Business Contracting Limited | Professional & scientific | 2023 |
| Clarke Legal Services Limited | Professional & scientific | 2024 |
| Clarke Surgical Limited | Health & social care | 2010 |
| Clarkys Sparkys Ltd | Construction | 2026 |
| Claud Systems Limited | Administrative & support | 2025 |
| Claw Industries Ltd | Manufacturing | 2025 |
| Clayton Surveying Ltd | Construction | 2021 |
| CLC Wimborne Ltd | Real estate | 2022 |
| Clean and Press Limited | Other services | 2017 |
| Clear and Present Limited | Information & communication | 2025 |
| Clear CUT Accounts Limited | Professional & scientific | 2014 |
| Clear-Cut Security Ltd | Information & communication | 2023 |
| Clearline Drainage Limited | Water & waste | 2025 |
| Clearpath Transformation Limited | Professional & scientific | 2026 |
| Clearshot Ltd | Professional & scientific | 2024 |
| Clearspan Tree Management Ltd | Agriculture & fishing | 2026 |
| Clearview Surveys Limited | Professional & scientific | 2003 |
| Clearview Utilities Ltd | Professional & scientific | 2018 |
| Clearwater Consulting Limited | Information & communication | 2007 |
| Clearwater Environmental Consulting Limited | Professional & scientific | 2021 |
| Cledev Limited | Administrative & support | 2021 |
| Clever UK Energy Solutions Ltd | Professional & scientific | 2014 |
| Click Thermal Limited | Manufacturing | 2013 |
| Climate Controlled Solutions Ltd | Wholesale & retail | 2009 |
| Clinical Quill Ltd | Professional & scientific | 2025 |
| Clive Gordon Consulting Limited | Professional & scientific | 2023 |
| Cloud Consulting SCM Ltd | Information & communication | 2021 |
| Cloud Curation Limited | Information & communication | 2020 |
| Cloud Phoenix Limited | Information & communication | 2020 |
| Cloud Projects Limited | Professional & scientific | 2020 |
| Cloud Ursa Ltd | Information & communication | 2016 |
| Cloud-Tek Ltd | Information & communication | 2022 |
| Cloudable Ltd | Information & communication | 2019 |
| Cloudcat Limited | Information & communication | 2024 |
| Cloudcrest Consulting Limited | Information & communication | 2025 |
| Cloudforest Intelligence Ltd | Information & communication | 2025 |
| Cloudgenesis Limited | Information & communication | 2022 |
| Cloudmove Ltd | Information & communication | 2018 |
| Clouds Hill Associates Limited | Professional & scientific | 2016 |
| Cloudsignal Consulting Ltd | Information & communication | 2026 |
| Clpm Holdings Limited | Real estate | 2026 |
| Clsj Property Limited | Real estate | 2019 |
| Club Bradshaw Limited | Wholesale & retail | 2025 |
| CLUBHOUSE1896 Ltd | Hospitality | 2019 |
| CM Rowland Consulting Limited | Professional & scientific | 2024 |
| Cmds Consulting Limited | Professional & scientific | 2024 |
| Cmkw Limited | Professional & scientific | 2019 |
| Cmpg Limited | Information & communication | 2024 |
| CMR Options Ltd | Administrative & support | 2015 |