| Central Nail & Beauty Ltd | Manufacturing | 2025 |
| Centralec Electrical Limited | Extraterritorial | 2025 |
| Centre for Aviation Psychology Ltd | Administrative & support | 2016 |
| Centrespace (Wells) Limited | Real estate | 2018 |
| Century Wealth Management Ltd | Financial services | 2024 |
| Cereal Crops Trading LLP | | 2011 |
| Cerebral Abomination Ltd | Arts & recreation | 2024 |
| Ceylola Ltd | Wholesale & retail | 2026 |
| CG Building Ltd | Construction | 2015 |
| Chadwick Consulting & Training Ltd | Education | 2011 |
| Chalice Mews Management Company Limited | Households | 1988 |
| Chameleon Bedrooms & Kitchens Ltd | Construction | 2008 |
| Chamois Consulting Limited | Professional & scientific | 2016 |
| Chane Limited | Financial services | 2001 |
| Chanington Property Investment Ltd | Real estate | 2021 |
| Chantry Barn Ltd | Construction | 2025 |
| Chapel Barn Consultancy Limited | Professional & scientific | 2026 |
| Chapel Barn Equine Limited | Agriculture & fishing | 2026 |
| Chapel Barn Holdings Limited | Financial services | 2026 |
| Chapel Barn Property Limited | Real estate | 2026 |
| Chapel Roofing and Building Services Limited | Construction | 2006 |
| Chaplin a Limited | Wholesale & retail | 2025 |
| Charvil Management Limited | Professional & scientific | 2001 |
| Chata PL Ltd | Hospitality | 2021 |
| Chatham House Ltd | Construction | 2018 |
| Checkmate TV Show Season II Limited | Information & communication | 2015 |
| Checkmate TV Show Season III Limited | Information & communication | 2016 |
| Cheddar GIN Company Ltd | Manufacturing | 2021 |
| Cheddar Vodka Company Ltd | Manufacturing | 2021 |
| Cheddar Vodka Ltd | Manufacturing | 2021 |
| Chedzoy Village Hall Ltd | Hospitality | 2025 |
| Chetworth Property Management Limited | Professional & scientific | 1987 |
| Cheung's (Somerset) Limited | Hospitality | 2015 |
| Chew Valley Stores Ltd | Wholesale & retail | 2013 |
| Chhs Limited | Hospitality | 2007 |
| Chick Master Holdings Limited | Financial services | 1998 |
| Chilcorn Cash for Clothes Limited | Wholesale & retail | 2020 |
| Chilcorn Global Imports Limited | Wholesale & retail | 2017 |
| Chilcorn Limited | Wholesale & retail | 2011 |
| Childcare Southwest Ltd | Health & social care | 2016 |
| Childs Charitable Trust | Other services | 2013 |
| Chilela Coffee Ltd | Manufacturing | 2021 |
| China Star Takeaway Ltd | Hospitality | 2021 |
| Chinehorn Development Company Limited | Households | 2017 |
| Chippedmonkey Ltd | Other services | 2025 |
| Chippergolfapparel Limited | Wholesale & retail | 2025 |
| Chisletts (Highbridge) Limited | Administrative & support | 1995 |
| Chizzy Sparkles Limited | Transport & logistics | 2025 |
| Choit Ltd | Wholesale & retail | 2023 |
| Chris Flay Plumbing and Heating Limited | Construction | 2000 |
| Chris Francis Electrical Services Limited | Construction | 2013 |
| Chris James Building Services Limited | Construction | 2018 |
| Christelos Care & Maintenance Ltd | Administrative & support | 2019 |
| Christergirl Makb Ltd | Other services | 2023 |
| Christian Zheng Sheng Association UK CIC | Education | 2022 |
| Chrysalis NOT for Profit Limited | Education | 2010 |
| Chrysalis Offices Limited | Real estate | 2023 |
| Chrysalis Workplace Ltd | Education | 2026 |
| CHS Plant & Tool Hire Ltd | Administrative & support | 1989 |
| Chunky Riders Trading AS Leather & Lace Ltd | Hospitality | 2025 |
| Churley LLP | | 2018 |
| CI Wales and West Limited | Wholesale & retail | 1993 |
| Circle Truck & Plant Maintenance Limited | Wholesale & retail | 2015 |
| Circuitbase Ltd | Professional & scientific | 2018 |
| Circus Signs Limited | Extraterritorial | 2022 |
| Citagold Limited | Real estate | 2024 |
| Civil Giant Construction PVT Ltd | Construction | 2021 |
| Cjdawson Electrical Ltd | Construction | 2026 |
| CK Media House Ltd | Information & communication | 2020 |
| CKC Cleaning Services Ltd | Administrative & support | 2020 |
| CKP Consult Ltd | Construction | 2025 |
| CKS Metal Recycling Ltd | Wholesale & retail | 2024 |
| Clad South West Ltd | Construction | 2021 |
| Cladcoat Solutions Ltd | Construction | 2020 |
| Claravox Limited | Information & communication | 2024 |
| Clare Garner Ltd | Information & communication | 2026 |
| Claret Construction Ltd | Construction | 2022 |
| Class Hairstyle Ltd | Other services | 2021 |
| Class Publishing Limited | Information & communication | 1994 |
| Classicrallypress Limited | Information & communication | 2003 |
| Classy Cleaning Co SW Ltd | Administrative & support | 2024 |
| CLD Lorry UK Ltd | Transport & logistics | 2018 |
| Clean Waves SW Ltd | Administrative & support | 2026 |
| Cleaning UP With the Joneses Ltd | Administrative & support | 2025 |
| CLEANZ4U Ltd | Administrative & support | 2024 |
| Clearday Systems Ltd | Information & communication | 2026 |
| Clearview Windows UK Limited | Construction | 2008 |
| Clements Construction Southwest Limited | Construction | 2023 |
| Clevancy Farming Company(The) | Agriculture & fishing | 1936 |
| Clevedon Towers Management Limited | Construction | 1985 |
| Cleveland & Kent Ltd | Public administration | 2025 |
| Click the Button Ltd | Administrative & support | 2022 |
| Clickwind Ltd | Wholesale & retail | 2026 |
| Cliff Market Stores Limited | Wholesale & retail | 2021 |
| Cliffe Market Bristol Limited | Wholesale & retail | 2024 |
| Clifton Marquee Company Limited | Administrative & support | 2015 |
| Climb on Bikes Limited | Extraterritorial | 2011 |
| Clingcourt Limited | Hospitality | 1996 |
| Clisk Holdings | Financial services | 2025 |
| Clist Construction Limited | Professional & scientific | 2014 |