| CEJ Finance Ltd | Professional & scientific | 2025 |
| Cele Creative Limited | Information & communication | 2023 |
| Cellar 46 Ltd | Hospitality | 2020 |
| Central Agricultural & Energy Services Limited | Other services | 2002 |
| Ceri J Stanbury RMN Ltd | Health & social care | 2014 |
| CG Capability Consulting Limited | Professional & scientific | 2010 |
| Chainstarter Ltd | Information & communication | 2017 |
| Chainstarter Ventures Ltd | Information & communication | 2018 |
| Charter Walk Limited | Real estate | 2014 |
| Charterhouse Turf Machinery Limited | Wholesale & retail | 1979 |
| Chartfield Technical Services Limited | Professional & scientific | 1998 |
| Chel Holdings Limited | Construction | 2016 |
| Chelsea Nest Ltd | Hospitality | 2020 |
| Chemistry Club Ltd | Information & communication | 2022 |
| Chequered Flag Properties Limited | Real estate | 2008 |
| Cherrylands Close Fernhurst (Management Company) Limited | Real estate | 1996 |
| Chevine Limited | | 1985 |
| Chien Perdu Ltd | Manufacturing | 2023 |
| Chloe Thorne Permanent Cosmetics & Aesthetics Ltd | Other services | 2022 |
| Chris Berry Design Services Ltd | Professional & scientific | 2022 |
| Christiansen Architects Ltd | Professional & scientific | 2014 |
| Christopher's Choice CIC | Health & social care | 2024 |
| Circumference Productions Ltd | Arts & recreation | 2015 |
| CKJ Business Services Ltd | Administrative & support | 2025 |
| Clansman Solutions Ltd | Construction | 2019 |
| Clarion Music Ltd. | Arts & recreation | 2015 |
| Clark & Co Construction Limited | Construction | 2021 |
| Clasiq Ltd | Administrative & support | 2017 |
| CLB Batteries Limited | Professional & scientific | 2026 |
| CLB Energy Limited | Professional & scientific | 2025 |
| CLEAR2MOVE Ltd | Transport & logistics | 2026 |
| Clement Holdings Limited | Professional & scientific | 1991 |
| Clement Windows Group Limited | Manufacturing | 2016 |
| Clement Windows Limited | Manufacturing | 2009 |
| Clement Windows Projects Limited | Manufacturing | 2009 |
| Clerke Ltd | Information & communication | 2026 |
| Click 26 Limited | Professional & scientific | 2009 |
| Client Magnet Limited | Professional & scientific | 2020 |
| Cloud Care Solutions Limited | Administrative & support | 2021 |
| Cloud Medical Limited | Health & social care | 2015 |
| Clubcast Limited | Extraterritorial | 2022 |
| CM Electrical Installations Limited | Construction | 2014 |
| Co-Ordinated Properties Limited | Real estate | 1970 |
| Coco Carmel Ltd | Administrative & support | 2012 |
| Cocoa Tree Health Limited | Health & social care | 2024 |
| Cocoon (UK) Ltd | Real estate | 2012 |
| Coded Systems Limited | Information & communication | 2017 |
| Codex Capital Partners (UK) Limited | Financial services | 2014 |
| Codex Capital Partners Limited | Professional & scientific | 2005 |
| Codex Caplan Nominees Limited | Administrative & support | 2022 |
| Codex DAM 2 Limited | Professional & scientific | 2024 |
| Codex DAM 3 Limited | Professional & scientific | 2026 |
| Codex Matilda Limited | Professional & scientific | 2026 |
| Cojam Events Limited | Administrative & support | 2015 |
| Colemere Limited | Real estate | 2017 |
| Collage Recruitment Ltd | Administrative & support | 2021 |
| Colliers Equestrian Ltd | Arts & recreation | 2014 |
| Colliers Farm LLP | | 2008 |
| Colosseum Protection and Security Services Limited | Administrative & support | 2015 |
| Columbia House Development II Limited | Construction | 2021 |
| Columbia House Development Limited | Construction | 2017 |
| Columbia House Holdco Limited | Construction | 2023 |
| Comeragh Consulting Limited | Information & communication | 2013 |
| Community Orchard Project South East CIC | Agriculture & fishing | 2019 |
| Compass Estates LLP | | 2022 |
| Compassionate Cleaning Company Ltd | Administrative & support | 2025 |
| Concise Construction Limited | Real estate | 1992 |
| Connect Mobile Holdings Limited | Information & communication | 2024 |
| Considered Content Limited | Professional & scientific | 2012 |
| Consult Specify and Supply Ltd | Wholesale & retail | 2023 |
| Conte Properties LLP | | 2013 |
| Content and Colour Creatives Ltd | Professional & scientific | 2019 |
| Content Works Ltd | Professional & scientific | 2026 |
| Contex-City Limited | Information & communication | 2019 |
| Coombe Healthcare Ltd | Health & social care | 1999 |
| Copse Mews Management Company Limited | Households | 2004 |
| Corporate Heart Limited | Professional & scientific | 1997 |
| Couchman Hanson Limited | Professional & scientific | 2012 |
| Countryside Provence Ltd | Construction | 1996 |
| Cove Consultants Ltd | Professional & scientific | 2017 |
| Cowgirls on the Wagon Ltd | Wholesale & retail | 2024 |
| CR Tiling Limited | Construction | 2025 |
| Cranleigh Carpet Warehouse Limited | Wholesale & retail | 2026 |
| CRB Trading Limited | Wholesale & retail | 2023 |
| CRC (UK) Bioenergy and Commodities Limited | Transport & logistics | 2025 |
| CRC Carpentry & Construction Ltd | Construction | 2024 |
| Crit-Iq Ltd | Education | 2026 |
| Critchmere Consulting Ltd | Information & communication | 2025 |
| Criterion a Psychology Services Ltd | Health & social care | 2013 |
| Croftlands Capital Ltd | Professional & scientific | 2016 |
| Croftlands Consulting Limited | Professional & scientific | 2017 |
| Croftlands Properties Limited | Real estate | 2017 |
| Crofton (East) Residents Management Company Ltd | Households | 2020 |
| Croftprop 1 Limited | Real estate | 2017 |
| Cross Channel Challenge Limited | Extraterritorial | 2000 |
| Crossfield AY Ltd | Hospitality | 2026 |
| Crown Barber 11 Ltd | Other services | 2024 |
| Crown Barber 12 Ltd | Other services | 2025 |
| Crucible Business Communications LLP | | 2006 |
| CSK Groundworks & Construction Ltd | Construction | 2025 |