| Capturemotion Limited | Professional & scientific | 2024 |
| Cara Mitchell Dental Hygiene and Therapy Limited | Health & social care | 2012 |
| Carbon Cost Consultancy Ltd | Professional & scientific | 2023 |
| Cardil Ltd | Other services | 2023 |
| Carepoint Consultancy Ltd | Professional & scientific | 2025 |
| Carl Beavis Plumbing & Heating Limited | Construction | 2023 |
| Carl Cleaning Services Limited | Administrative & support | 2017 |
| Carnaval International Ltd | Wholesale & retail | 2018 |
| Carousel Bars Limited | Hospitality | 2011 |
| Carter Street Garages Ltd | Real estate | 1978 |
| Carters Farm Management Company Limited | Households | 2017 |
| Casa Meditrina Limited | Wholesale & retail | 2025 |
| CASH4CARS Ltd | Wholesale & retail | 2022 |
| Castle Eaton Renewable Limited | Energy | 2013 |
| Casuga Limited | Administrative & support | 2010 |
| Cathedral Auto Locksmiths Ltd | Other services | 2023 |
| Cathedral Paving Limited | Construction | 2003 |
| Cathedral Plumbing & Heating Limited | Construction | 2017 |
| Cathedral ST James Ltd | Wholesale & retail | 2020 |
| Cathedral View Childcare Ltd | Education | 2018 |
| Cathedral View Childcare Property Holdings Ltd | Real estate | 2025 |
| Cathedral View Management Company (ELY) Limited | Real estate | 2002 |
| Cattani Limited | Manufacturing | 2023 |
| Cavell Group Ltd | Professional & scientific | 2005 |
| Cavendish Court (Flat Management) Limited | Households | 1983 |
| Caversham House Limited | Professional & scientific | 2021 |
| CB Engineering (Cambs) Ltd | Professional & scientific | 2015 |
| CB Groundworks & Construction Limited | Construction | 2008 |
| CB Properties & Lettings Ltd | Real estate | 2018 |
| CB Trading Ltd | Hospitality | 2024 |
| Cbg&C Holdings Ltd | Financial services | 2019 |
| Cblp Ltd | Other services | 2024 |
| Cbseven Holdings Limited | Professional & scientific | 2016 |
| CD Property Webb Ltd | Real estate | 2020 |
| Cd-Draughting Limited | Professional & scientific | 2002 |
| CE Building Designs Ltd | Professional & scientific | 2015 |
| Cedar & Bloom Ltd | Information & communication | 2026 |
| Central Agro UK PVT Ltd | Construction | 2024 |
| Cerulean Property Developers Ltd | Construction | 2022 |
| CES 2025 Investments | Real estate | 2025 |
| CES Prop Ltd | Real estate | 2020 |
| CF Roofing Group Limited | Construction | 2026 |
| CFR Construction Group Limited | Extraterritorial | 2026 |
| CFR Contracts Limited | Extraterritorial | 2019 |
| CFR Projects Limited | Construction | 2025 |
| CFR Renewables Limited | Construction | 2026 |
| CFR Roofing Limited | Extraterritorial | 2026 |
| Chaffinch Web Development Limited | Information & communication | 2011 |
| Chambers Way Management Limited | Real estate | 2010 |
| Chamomile Cards Ltd | Wholesale & retail | 2025 |
| Champagne Group Ltd | Hospitality | 2025 |
| Chancel Farm Ltd | Agriculture & fishing | 2025 |
| Changingenergy Limited | Energy | 2017 |
| Chapel Court Building Management Limited | Households | 2016 |
| Chapman & Chapman Construction Consultancy Ltd | Professional & scientific | 2014 |
| Chapter Forge Ltd | Information & communication | 2025 |
| Cheltenham Holdings Limited | Professional & scientific | 1993 |
| Cheltenham Laminating Co Limited | Manufacturing | 1988 |
| Cherry Downham Limited | Wholesale & retail | 2025 |
| Chester Park Homes Limited | Hospitality | 2025 |
| Chevalier (Stansted) Management Company Limited | Households | 2019 |
| Chic Face and Body Clinic Limited | Other services | 2015 |
| Chillco Refrigeration Limited | Other services | 2017 |
| Chippenham Bloodstock Limited | Agriculture & fishing | 1986 |
| Chippenham Park Events LLP | | 2011 |
| Chloe Charlotte Developments Limited | Construction | 2002 |
| Chouls & Co Limited | Professional & scientific | 2016 |
| Chris Norman Carpentry and Building Ltd | Construction | 2010 |
| Chris Stewart Lettings Limited | Real estate | 2005 |
| Christian Education Group Ltd | Education | 2019 |
| Christian James Investments and Property Management Limited | Real estate | 2016 |
| Christopher Oakman Ltd | Professional & scientific | 2018 |
| Chubz Limited | Professional & scientific | 2025 |
| Chuckl Ltd | Arts & recreation | 2020 |
| Church Meadows (Sawtry) Management Limited | Households | 2017 |
| Church View Property Management Limited | Households | 2021 |
| Churchil Property Management Ltd | Real estate | 2026 |
| CIH Associates Limited | Professional & scientific | 2011 |
| CILO27 Limited | Hospitality | 2026 |
| Cinemea Ltd | Information & communication | 2019 |
| Cipher Consultants Limited | Real estate | 1987 |
| CJ Noah Ltd | Public administration | 2022 |
| CJ Prop Ltd | Agriculture & fishing | 2016 |
| CJA Property Services Limited | Real estate | 2021 |
| CJR Plumbing and Heating Limited | Construction | 2015 |
| CJS Group Holdings Limited | Financial services | 2022 |
| CJS Land (2014) Limited | Agriculture & fishing | 2014 |
| CJW Consulting Solutions Limited | Information & communication | 2011 |
| CKD Translation Ltd | Professional & scientific | 2013 |
| Cland Properties Ltd | Real estate | 2016 |
| Clarks & Spencer Limited | Wholesale & retail | 2024 |
| Clarks Heating and Plumbing Services Limited | Administrative & support | 2017 |
| Clavia Ltd | Professional & scientific | 2015 |
| Clay Alliance Ltd | Professional & scientific | 2022 |
| Claymore Industrial Investment Company Limited | Extraterritorial | 2016 |
| Cleans & Shine Ltd | Administrative & support | 2019 |
| Clear Focus Consulting Ltd | Professional & scientific | 2016 |
| Clennell Trading Limited | Wholesale & retail | 1999 |
| Clinical Visions Ltd | Construction | 2023 |
| Clip'So Stylists Limited | Other services | 2003 |