| Ccsalons Ltd | Other services | 2018 |
| CD Datahouse Limited | Information & communication | 2009 |
| CDR Consultants Limited | Construction | 2007 |
| Cedar Court (Windsor) Limited | Households | 1993 |
| Cedar HR Limited | Financial services | 2010 |
| Celadecor Ltd | Construction | 2025 |
| Celestrix Realty Ltd | Real estate | 2020 |
| Celliq Ltd | Information & communication | 2026 |
| Cementex Tools UK Ltd | Manufacturing | 2026 |
| Centcherri Ltd | Wholesale & retail | 2021 |
| Centralise Limited | Information & communication | 2020 |
| Centrica Barry Limited | Energy | 2003 |
| Centrica Beta Holdings Limited | Administrative & support | 2003 |
| Centrica Business Solutions (Generation) Limited | Energy | 1991 |
| Centrica Business Solutions Management Limited | Professional & scientific | 1996 |
| Centrica Business Solutions UK Limited | Manufacturing | 1984 |
| Centrica Business Solutions UK Optimisation Limited | Professional & scientific | 2013 |
| Centrica Combined Common Investment Fund Limited | Financial services | 2002 |
| Centrica Directors Limited | Extraterritorial | 1999 |
| Centrica Distributed Generation Limited | Energy | 2003 |
| Centrica Energy Assets Holdings Limited | Energy | 2004 |
| Centrica Energy Investments Limited | Financial services | 2009 |
| Centrica Energy Marketing Limited | Energy | 2013 |
| Centrica Engineers Pension Trustees Limited | Extraterritorial | 1997 |
| Centrica Gamma Holdings Limited | Administrative & support | 2003 |
| Centrica Hive Limited | Information & communication | 2006 |
| Centrica Holdings Limited | Professional & scientific | 2005 |
| Centrica Innovations UK Limited | Financial services | 2017 |
| Centrica Lake Limited | Financial services | 2014 |
| Centrica LNG UK Limited | Mining & quarrying | 2015 |
| Centrica Nigeria Limited | Professional & scientific | 2005 |
| Centrica Pension Plan Trustees Limited | Professional & scientific | 1948 |
| Centrica Pension Trustees Limited | Professional & scientific | 1997 |
| Centrica River Limited | Financial services | 2025 |
| Centrica Secretaries Limited | Extraterritorial | 2000 |
| Centrica Services Limited | Professional & scientific | 2017 |
| Centrica Smart Meter Assets Limited | Administrative & support | 2023 |
| Centrica Supply Chain Limited | Wholesale & retail | 2021 |
| Centrica Trading Limited | Extraterritorial | 2002 |
| Centrica Trust (NO.1) Limited | Administrative & support | 2005 |
| Centrona Consulting Limited | Information & communication | 2011 |
| Century Law Limited | Financial services | 1999 |
| Certech International Limited | Extraterritorial | 1985 |
| Cerulean 25 Limited | Administrative & support | 2024 |
| Cerulean Ltd | Professional & scientific | 2013 |
| Ceruleite UK Ltd | Administrative & support | 2024 |
| CF 2016 LLP | | 2016 |
| Cfceps LLP | | 2013 |
| Cffw Ltd | Construction | 2019 |
| CFK Holdings Limited | Construction | 2020 |
| CG Gorilla Roofing Limited | Construction | 2024 |
| Cgcf Investments Ltd | Real estate | 2014 |
| CH Twentythree Ltd | Wholesale & retail | 2026 |
| Chadwell Street Limited | Professional & scientific | 2017 |
| Chaffinch Close Management Company Ltd | Households | 2012 |
| Chamber Street Developments Limited | Professional & scientific | 2005 |
| Chambers Fresh Ltd | Wholesale & retail | 2019 |
| Chammack Properties Ltd | Real estate | 2020 |
| Chandler Brown Consulting Limited | Professional & scientific | 2005 |
| Chantry Close Management Company Limited | Households | 1990 |
| Chantry Place Management Company Limited | Households | 1989 |
| Chapero Marsh Limited | Professional & scientific | 2003 |
| Chardikala Builders Ltd | Construction | 2025 |
| Chariotts Place Management Company Limited | Households | 1987 |
| Charles Coleman LLP | | 2006 |
| Charleston ABC Ltd | Professional & scientific | 2024 |
| Charsley Harrison LLP | | 2008 |
| Chartervale Limited | Real estate | 1999 |
| Chasefield Estates Ltd | Real estate | 2025 |
| Chatlink Solution Ltd | Manufacturing | 2022 |
| Chatsworth Park Automobiles Ltd | Wholesale & retail | 2018 |
| Chattering a Ltd | Construction | 2026 |
| Chattering Builders Limited | Construction | 2015 |
| Chattering Construction Ltd | Construction | 2026 |
| Chattering Investment Limited | Real estate | 2013 |
| Chattering Management Limited | Construction | 2017 |
| Chau UK2 Ltd | Hospitality | 2021 |
| Chauffeur Collective Ltd | Transport & logistics | 2024 |
| Cheap Building Material Limited | Wholesale & retail | 2022 |
| Cheeky COW Craft Ltd | Hospitality | 2021 |
| Cheesemungers Limited | Wholesale & retail | 2019 |
| Chelmsford Court Management Co. Limited | Households | 1982 |
| Chelsea Motor Company Ltd | Wholesale & retail | 2023 |
| Cheltenham Linen Company Ltd | Real estate | 2019 |
| Cherry Tree Management (Windsor) Limited | Households | 2006 |
| Cherrygrove Ventures Ltd | Information & communication | 2012 |
| Cherrywood Ltd | Financial services | 2021 |
| Chesham Road Management Company Limited | Households | 2008 |
| Chesterfield Property Group Ltd | Real estate | 2024 |
| Chesterton Manor (Beaconsfield) Management Company Limited | Households | 2018 |
| Chesterton Place Freehold Limited | Households | 2013 |
| Chesterton Place Management Company Limited | Households | 2009 |
| CHI Naturals Ltd | Other services | 2018 |
| CHILDREN4CHILDRENNEPAL | Health & social care | 2012 |
| Chiltern Court Residents Limited | Real estate | 1988 |
| Chiltern Mews (Amersham) Limited | Households | 2007 |
| Chipify Ltd | Hospitality | 2024 |
| Chiron Unia Limited | Professional & scientific | 2025 |
| Choiceability Ltd | Other services | 2007 |
| CHR Property Investments Ltd | Real estate | 2025 |