| CDM Offshore Services Ltd | Public administration | 2016 |
| CE Management & Consultancy Ltd | Real estate | 2025 |
| Cedar Close Freehold Limited | Households | 2018 |
| Cedar Gardens Care Ltd. | Health & social care | 1998 |
| Cedarcoast Properties Limited | Real estate | 1996 |
| Cefinejoy Healthcare Limited | Health & social care | 2016 |
| Cellar Systems Limited | Administrative & support | 1989 |
| Celtic Resource Management Limited | Real estate | 2015 |
| Center U Limited | Health & social care | 2025 |
| Central and Provincial Estates Limited | Real estate | 1991 |
| Central Eden Properties Ltd | Real estate | 2024 |
| Central Pacific One Ltd | Real estate | 2020 |
| Central Service Tech Ltd | Information & communication | 2012 |
| Centre of Boston Limited | Hospitality | 2025 |
| Centreville Partners Limited | Administrative & support | 2013 |
| Centrolene Limited | Information & communication | 2018 |
| Centrum Capital Group Limited | Real estate | 2026 |
| Cepf II (Woking) Limited | Real estate | 2017 |
| Cermar Maritime Enterprises (U.K.) Limited | Transport & logistics | 1981 |
| CES Legal Services Ltd | Professional & scientific | 2022 |
| Cetra Limited | Financial services | 2015 |
| Cetra Security Trustees Limited | Other services | 2018 |
| Ceylon Media Limited | Financial services | 2014 |
| Cezi Cars Ltd | Transport & logistics | 2025 |
| CF INVESTCO1 Ltd | Financial services | 2025 |
| CFM Utilities & Groundworks Ltd | Construction | 2017 |
| CG Processing Ltd | Other services | 2018 |
| CH10 Ultimate Property Holdings Ltd | Financial services | 2024 |
| Chadbrook Construction Ltd | Construction | 2020 |
| Challenging Qualities Training & Consultancy Limited | Information & communication | 2012 |
| Champalimaud UK Operating Company Limited | Health & social care | 2025 |
| Champion Childcare Ltd | Health & social care | 2025 |
| Champion Hire (London) Limited | Administrative & support | 2007 |
| Chana's Hair and Wigs Limited | Other services | 2023 |
| Chandler Blake Ltd | Hospitality | 2026 |
| Change Capabilities Limited | Administrative & support | 2022 |
| Changing Lanes Services LLP | | 2018 |
| Channel 11 (Southern) Limited | Real estate | 2010 |
| Channel Marketing People Limited | Professional & scientific | 2011 |
| Channel Timber Limited | Wholesale & retail | 1991 |
| Character 7 Limited | Information & communication | 2015 |
| Charles & Charles Group Limited | Administrative & support | 2016 |
| Charles Birchmore Photography Limited | Professional & scientific | 2005 |
| Charles Reed Limited | Arts & recreation | 2012 |
| Charley Rose Ltd | Information & communication | 2019 |
| Charli Marie Limited | Professional & scientific | 2017 |
| Charlie's Plumbing and Heating Limited | Construction | 2018 |
| Charly Comtex Ltd | Construction | 2022 |
| Charmill Residential Ltd | Real estate | 2020 |
| Charnford Limited | Wholesale & retail | 2000 |
| Chase Electrics Ltd | Construction | 2014 |
| Chasewood Lodge Limited | Hospitality | 2015 |
| Chat Consultancy Ltd | Professional & scientific | 2014 |
| Chawdherys Properties Investment Limited | Real estate | 2020 |
| Cheeky Monkey Productions Limited | Professional & scientific | 2007 |
| Chelham Healthcare Ltd | Health & social care | 2023 |
| Chelmer Village Properties Ltd | Real estate | 2021 |
| Chelsea Designers Ltd | Professional & scientific | 2005 |
| Chelsea Hair and Beauty Ltd | Other services | 2021 |
| Chelsea Hair Ltd | Other services | 2023 |
| Chemical Overseas Limited | Administrative & support | 1961 |
| Chemsense Ltd | Manufacturing | 2022 |
| Chen's Lots of Rice Ltd | Hospitality | 2024 |
| Chenies Healthcare Limited | Health & social care | 2012 |
| Chenies Place Barnet Management Company Limited | Administrative & support | 2007 |
| Cherry Croft Residents Association Limited | Other services | 1981 |
| Chesave | Professional & scientific | 2021 |
| Cheshire Property Services (Wilmslow) Ltd | Households | 2018 |
| Chessfield Burton Limited | Real estate | 2019 |
| Chessview Estates Ltd | Professional & scientific | 2024 |
| Chester RD Maintenance Ltd | Real estate | 2009 |
| Chester Smile Design & Implant Centre Limited | Health & social care | 2021 |
| Chesterford Construction Limited | Construction | 2019 |
| Chesterton House (Beaconsfield) Management Company Limited | Households | 2022 |
| Cheybassa Caring Limited | Extraterritorial | 2015 |
| Chez Mousse Ltd | Hospitality | 2018 |
| Chichitech Limited | Information & communication | 2023 |
| Chichni Pizzeria Ltd | Hospitality | 2016 |
| Chicopee Limited | Real estate | 2025 |
| Chililt Ltd | Information & communication | 2014 |
| Chiliveri Homes Ltd | Real estate | 2022 |
| Chill Winston’S Limited | Manufacturing | 2025 |
| Chill Your Bean Coffee Haus Ltd | Hospitality | 2021 |
| Chillogic Limited | Transport & logistics | 2003 |
| China Traditional Culture and Arts Centre Limited | Administrative & support | 2019 |
| Chiranjeevi Enterprise Limited | Health & social care | 2019 |
| Chiswell Green Equestrian Centre Limited | Agriculture & fishing | 2018 |
| Chlojack Film Ltd | Construction | 2019 |
| CHN Property 1 Limited | Real estate | 2026 |
| CHN Property Limited | Real estate | 2026 |
| Choice Menu Direct Limited | Hospitality | 2013 |
| Chopstix Bromley Limited | Real estate | 2021 |
| Chopstix Chatham Limited | Real estate | 2015 |
| Chopstix Crawley Limited | Real estate | 2013 |
| Chopstix Harrow Ltd | Real estate | 2015 |
| Chopstix Liverpool Limited | Real estate | 2013 |
| Chopstix Redditch Limited | Real estate | 2013 |
| Chopstix Southend Ltd | Hospitality | 2025 |
| Chopstix Washington Limited | Real estate | 2014 |
| Chopstix Woking Limited | Real estate | 2013 |