| Cherrington-Smith Properties Ltd | Construction | 2026 |
| Cherry Bomb Digital Limited | Information & communication | 2020 |
| Cherry PIE London Limited | Other services | 2010 |
| Cherry Tree Park Ltd | Real estate | 2026 |
| Cherry-Picked Events Ltd | Professional & scientific | 2022 |
| Cherryice Limited | Wholesale & retail | 2020 |
| Chertsey Home Ltd | Wholesale & retail | 2017 |
| Chesham Lyall Ltd | Professional & scientific | 2016 |
| Chesham Street Investments Limited | Construction | 2018 |
| Chester Lodge (Worthing) RTM Company Ltd | Households | 2021 |
| Chewboy Productions Ltd | Information & communication | 2020 |
| Chic Hairdressing & Beauty Ltd | Other services | 2025 |
| Chichester Decorating Limited | Construction | 2017 |
| Chichester Stoneworks (2022) Limited | Manufacturing | 2022 |
| Chigwell Propco Limited | Financial services | 2022 |
| Chilli Pepper Productions Limited | Information & communication | 2003 |
| Chilton Automotive Ltd | Wholesale & retail | 2014 |
| Chimp Productions Limited | Information & communication | 2017 |
| Chinns Limited | Hospitality | 2020 |
| Chip Holdings Ltd | Financial services | 2023 |
| Chipperfield & Butler Limited | Real estate | 1920 |
| Chirpy Chicken Limited | Hospitality | 2022 |
| Chocolate Hill Limited | Wholesale & retail | 2014 |
| Chocolate Kitesurf Ltd | Arts & recreation | 2026 |
| Chopstix Guildford Ltd | Hospitality | 2023 |
| Chowbert Medical Ltd | Education | 2021 |
| CHR Wraps and Graphics Limited | Other services | 2018 |
| Chris and Katie Brown Ltd | Real estate | 2021 |
| Chris Brown Electrical Limited | Construction | 2025 |
| Chris Harding Limited | Information & communication | 2008 |
| Christ Kingdom Mission International (Ckmi) Ltd | Information & communication | 2011 |
| Christian Delcambre Limited | Administrative & support | 1999 |
| Christian Relief Initiative Ltd | Professional & scientific | 2025 |
| Christina Grant Consultancy Ltd | Education | 2016 |
| Christine Barber Consultancy Limited | Professional & scientific | 2003 |
| Chronold Ltd | Arts & recreation | 2022 |
| Church Street Dental Practice (Sussex) Limited | Health & social care | 2013 |
| Churchillfield Limited | Administrative & support | 2025 |
| Churchley Holdings Limited | Professional & scientific | 2001 |
| Churchley Properties Ltd | Real estate | 2001 |
| Chuzzlewit Limited | Information & communication | 2007 |
| Cinebook Limited | Information & communication | 1996 |
| Cinsir Ltd | Information & communication | 2021 |
| Cintsa Ltd | Construction | 2008 |
| Circle Garage Limited | Wholesale & retail | 1999 |
| Circle Power Ltd | Professional & scientific | 2022 |
| Circum TEC Ltd | Information & communication | 2009 |
| Cirrus Property Group Limited | Real estate | 2018 |
| Cirrus Student Homes Limited | Professional & scientific | 2025 |
| Cirrus Student Investments Limited | Construction | 2021 |
| Cirrus Student Portfolio Limited | Real estate | 2025 |
| Cirrus Virtual HR Ltd | Administrative & support | 2015 |
| Cissbury Barns Limited | Other services | 2025 |
| Cissbury Building Co Ltd | Other services | 2017 |
| Cissbury House LLP | | 2025 |
| Cissbury Plumbing & Heating Ltd | Construction | 2019 |
| Cissbury Property Management Limited | Real estate | 2024 |
| Cissbury Pubs and Bars Ltd | Hospitality | 2025 |
| Cissbury Storage Ltd | Real estate | 2023 |
| Citrino Consulting Limited | Professional & scientific | 2022 |
| City Contract Cleaning Ltd | Administrative & support | 2010 |
| City Elite Executive Search Ltd | Administrative & support | 2026 |
| City Lights RCH CIC | Hospitality | 2018 |
| Cityhub LDN Vauxhall Ltd. | Hospitality | 2018 |
| CJ Corp Limited | Professional & scientific | 2020 |
| Cjallow Limited | Health & social care | 2022 |
| CJH Live Ltd | Arts & recreation | 2019 |
| CJL Building Maintenance Ltd | Construction | 2012 |
| CJR Digital Ltd | Information & communication | 2018 |
| CJS Limited | Other services | 2009 |
| CKL Subco Limited | Information & communication | 2025 |
| CL Creation Limited | Professional & scientific | 2021 |
| Clabg Property Limited | Real estate | 2024 |
| Claire Leitch Accounting Services Limited | Professional & scientific | 2014 |
| Clan-G Limited | Financial services | 2015 |
| Clanic Limited | Hospitality | 2024 |
| Clare Gorrill Ltd | Wholesale & retail | 2022 |
| Clare Kirkland Limited | Professional & scientific | 2018 |
| Claremont Equity Partners Limited | Financial services | 2025 |
| Clarion Cars Limited | Extraterritorial | 1982 |
| Claritas Communications Limited | Professional & scientific | 2006 |
| Clark Computer & Management Services Limited | Information & communication | 1974 |
| Clarke and Co Limited | Transport & logistics | 2009 |
| Clarke and Co Properties Limited | Real estate | 2020 |
| Clarke and Co Properties Management Limited | Real estate | 2022 |
| Clarke Mechanical Limited | Construction | 2026 |
| Clarke Projects Ltd | Construction | 2021 |
| Clarkes Fibreglass Roofing Ltd. | Construction | 2014 |
| Class a Design Limited | Administrative & support | 2008 |
| Classic Craft Joinery Ltd | Real estate | 2013 |
| Classic Link Limited | Professional & scientific | 2001 |
| Claxton Properties and Maintenance Ltd | Real estate | 2002 |
| Clean Slate EOT Solutions Limited | Administrative & support | 2025 |
| Clean View Window Cleaners Ltd | Administrative & support | 2016 |
| Cleanforce (Sussex) Limited | Administrative & support | 2011 |
| Cleanright Limited | Extraterritorial | 2012 |
| Clear Computing Limited | Information & communication | 2008 |
| Clear Media Solutions Ltd | Information & communication | 2011 |
| Clearlake Properties Limited | Real estate | 2014 |
| Clearly Property North West Ltd | Real estate | 2016 |