| Chayne Lighting Ltd | Construction | 2022 |
| Chazinc Ltd | Information & communication | 2023 |
| Cheaplikeme Limited | Administrative & support | 2025 |
| Cheeky Chops Ltd | Professional & scientific | 2006 |
| Chef Adam Toth Limited | Hospitality | 2019 |
| Chegutu Investments Limited | Real estate | 2009 |
| Chegwidden Systems Limited | Information & communication | 1999 |
| Chelsie Lane Ltd | Wholesale & retail | 2022 |
| Cherish Interiors Limited | Wholesale & retail | 2021 |
| Cherished Marks Sussex Limited | Wholesale & retail | 2016 |
| Cheriton Homecare Limited | Health & social care | 2014 |
| Cherry Picked for YOU Limited | Wholesale & retail | 2010 |
| Cherrys Convenience Ltd | Wholesale & retail | 2024 |
| Cheshmack Limited | Health & social care | 2000 |
| Cheshunt Smile and Implant Centre Limited | Health & social care | 2017 |
| Chester House Haywards Heath Ltd | Construction | 2021 |
| Chestnut Grove Properties Limited | Agriculture & fishing | 2005 |
| Chevalier Group International Ltd | Professional & scientific | 2016 |
| Chevalier Wines Ltd | Wholesale & retail | 2016 |
| CHI Aesthetics Ltd | Other services | 2022 |
| Chichakli Limited | Hospitality | 2025 |
| Chichester Court (Bexhill on Sea) RTM Company Limited | Households | 2014 |
| Chief Jobs Limited | Information & communication | 2024 |
| Chieftain Trading Limited | Wholesale & retail | 2014 |
| Chihor Limited | Real estate | 2024 |
| Children's Knee Specialist Ltd | Health & social care | 2016 |
| Chilli Hove Limited | Hospitality | 2019 |
| Chiltington Land Limited | Real estate | 2009 |
| Chilton Media Law Limited | Information & communication | 1998 |
| Chippenham Land Investments Ltd | Administrative & support | 2009 |
| CHK Property Consultancy Limited | Real estate | 2024 |
| Chloe and the Wolf Ltd | Information & communication | 2019 |
| Chocolate Apple Limited | Professional & scientific | 2007 |
| Choicesmart Property Management Limited | Households | 1989 |
| Chopelle LLP | | 2021 |
| Choppelle Ltd | Real estate | 2025 |
| Chris Mcwilliams Communications Limited | Administrative & support | 2019 |
| Chris Nash Health Ltd | Financial services | 2024 |
| Chris Newton Software Ltd | Information & communication | 2025 |
| Chris Turnbull Marketing Ltd | Professional & scientific | 2021 |
| Christina C Ltd | Administrative & support | 2016 |
| Christopher Hazel Kitchens Ltd | Construction | 2024 |
| Chrome Olive Ltd | Professional & scientific | 2003 |
| Chrono Collective Ltd | Financial services | 2025 |
| Chulo LLP | | 2014 |
| Chung Enterprises Limited | Construction | 1983 |
| Church Road Studio Limited | Arts & recreation | 1996 |
| Churton Court (Worthing) Limited | Households | 2010 |
| CI Fitness London Limited | Health & social care | 2025 |
| Cian Cronin Development & Regeneration Ltd | Professional & scientific | 2023 |
| Ciranda Cultural Publishing Limited | Information & communication | 2011 |
| Circular Hub Ltd | Wholesale & retail | 2024 |
| Cirque DE LA Quirk Ltd | Arts & recreation | 2026 |
| Ciscom Internet Ltd | Information & communication | 2003 |
| Cissbury Property Maintenance Ltd | Other services | 2006 |
| Citrum Enterprises Ltd | Wholesale & retail | 2025 |
| City Dental Nottingham Limited | Health & social care | 2017 |
| City Dentist Limited | Health & social care | 2019 |
| City Ornate Mouldings Ltd | Manufacturing | 2023 |
| City Warmth Plumbing & Heating Limited | Construction | 2015 |
| Citycoast Trust | Health & social care | 2005 |
| Citydent Group Limited | Health & social care | 2023 |
| Citylets Brighton&Hove Ltd | Real estate | 2018 |
| Citylets South Limited | Real estate | 2018 |
| Citylets Sussex Ltd | Real estate | 2018 |
| Citypave Groundworks Ltd | Construction | 2020 |
| Civello Consulting Ltd | Information & communication | 2014 |
| Civicstack Ltd | Information & communication | 2026 |
| Cjays Consultancy Ltd | Information & communication | 2024 |
| CJB Property Limited | Real estate | 2021 |
| Cjra Ltd | Administrative & support | 2019 |
| CK Fishmonger Company Limited | Hospitality | 2023 |
| CK Skin LAB Ltd | Other services | 2025 |
| Ckgt Limited | Hospitality | 2022 |
| Claase Homes Ltd | Real estate | 2022 |
| Clack Holdings Ltd | Financial services | 2022 |
| Cladding Consultancy Services Limited | Professional & scientific | 1996 |
| Claire Norrish PR Ltd | Professional & scientific | 2007 |
| Claire Potter Design Ltd | Professional & scientific | 2017 |
| Claireon Limited | Professional & scientific | 2020 |
| Clamil Properties Limited | Real estate | 2010 |
| Claremont House Hotel Limited | Other services | 2006 |
| Clarence Lodge Ltd | Households | 2022 |
| Clarendon Enterprise Trading Limited | Real estate | 2019 |
| Clarendon Place Camberley Management Ltd | Real estate | 2006 |
| Clarity Water Ltd | Water & waste | 2019 |
| Clark Chiropractic Limited | Health & social care | 2014 |
| Clark Medical Services Limited | Health & social care | 2019 |
| Clark Stapleton Heating Limited | Construction | 1992 |
| Clarke-Walker Limited | Professional & scientific | 1994 |
| Classic Caterers Limited | Hospitality | 1999 |
| Classis Solutions Ltd | Information & communication | 2024 |
| Clayful Hands Limited | Arts & recreation | 2024 |
| Clayton Polymers Ltd | Manufacturing | 2014 |
| Clbs Properties Limited | Real estate | 2023 |
| Clean Emissions Ltd | Wholesale & retail | 2019 |
| Clean Solutions Plus Ltd | Administrative & support | 2022 |
| Cleanconnexions Ltd | Information & communication | 2024 |
| Cleaners on Demand Ltd | Administrative & support | 2026 |
| Cleantech House Ltd | Wholesale & retail | 2026 |