| Cabot Credit Management Limited | Financial services | 2006 |
| Cabot Financial (Europe) Limited | Financial services | 1997 |
| Cabot Financial (International) Limited | Extraterritorial | 1998 |
| Cabot Financial (UK) Limited | Financial services | 1999 |
| Cabot Financial Debt Recovery Services Limited | Financial services | 2000 |
| Cabot Financial Holdings Group Limited | Financial services | 2000 |
| Cabot Financial Limited | Financial services | 2006 |
| Cabot Securitisation Topco Limited | Administrative & support | 2017 |
| Cabot Securitisation UK Holdings Limited | Financial services | 2017 |
| Cabot Securitisation UK Limited | Administrative & support | 2017 |
| Cabot UK Holdco Limited | Financial services | 2013 |
| Cader Idris Developments Ltd | Real estate | 2023 |
| CAF Financial Solutions Limited | Financial services | 1992 |
| CAF Nominees Limited | Professional & scientific | 1975 |
| CAF Pension Scheme Trustees Limited | Extraterritorial | 2015 |
| Caireach Limited | Health & social care | 2004 |
| Calcott Developments Ltd | Real estate | 2019 |
| Call ME Productions Ltd | Information & communication | 2014 |
| Callisto Homes Upchurch Ltd | Real estate | 2025 |
| Callisto New Homes (ELM) Ltd | Construction | 2024 |
| Callisto New Homes (Wyebournes) Ltd | Construction | 2025 |
| Callisto New Homes Ltd | Construction | 2024 |
| Calm Lotus Ltd | Health & social care | 2026 |
| Calmsley Property Limited | Real estate | 2017 |
| Cameron Silk Limited | Extraterritorial | 2017 |
| Candy Cloud CAF Ltd | Hospitality | 2025 |
| Cantia Search Limited | Administrative & support | 2024 |
| Cantium Business Solutions Limited | Administrative & support | 2018 |
| Capital Enterprise Centres (UK) Limited | Real estate | 2023 |
| Capital Mechanical Ltd | Professional & scientific | 2022 |
| Capital Space Limited | Real estate | 2001 |
| Capital Space Trustees Limited | Professional & scientific | 2023 |
| Capstone Kent Estate Management Company Limited | Households | 2026 |
| Car Doctor (Medway) Limited | Wholesale & retail | 2014 |
| Carcary Recruitment Group Ltd | Administrative & support | 2023 |
| Cardiology Diagnostic Solutions Limited | Health & social care | 2014 |
| Care Angels Support Ltd | Health & social care | 2019 |
| Care Angels Supported Living Ltd | Health & social care | 2023 |
| Carehab Investments Ltd | Real estate | 2018 |
| Carey's Construction Limited | Construction | 2016 |
| Cargo Hire Ltd | Administrative & support | 2025 |
| Cargon LLP | | 2014 |
| Carmen Austin Architecture Ltd | Professional & scientific | 2012 |
| Carpbasics Ltd | Wholesale & retail | 2023 |
| Carroll Consultancy Services Ltd | Construction | 2025 |
| Carter James Partners Ltd | Administrative & support | 2025 |
| Carters Court Management Company Ltd | Households | 2022 |
| CAS Aspirations Properties Limited | Financial services | 2008 |
| CAS Healthcare Properties Limited | Professional & scientific | 2014 |
| CAS ST Paul's Limited | Health & social care | 2000 |
| Cased UP Limited | Manufacturing | 2019 |
| Casimir Limited | Hospitality | 2021 |
| Castobin Consulting Ltd | Information & communication | 2023 |
| Cater Caper Ltd | Wholesale & retail | 2025 |
| Ccgs Group Limited | Financial services | 2023 |
| CCS Trading Ltd | Manufacturing | 2018 |
| Cdbm Building Ltd | Manufacturing | 2022 |
| Cdpm Ltd | Professional & scientific | 2019 |
| Cellar Head Ltd | Wholesale & retail | 2024 |
| Cellini Property Holdings Limited | Real estate | 2019 |
| Cellio Ltd | Wholesale & retail | 2018 |
| Centre for Regional and International Development Limited | Professional & scientific | 2008 |
| Centrum Plus Group Limited | Financial services | 2018 |
| Centrum Plus Limited | Construction | 2016 |
| CF Distribution UK Limited | Extraterritorial | 1991 |
| Chalk to Coast CIC | Professional & scientific | 2026 |
| Champ Building Ltd | Manufacturing | 2018 |
| Chander Joshi Consulting Ltd | Professional & scientific | 2024 |
| Changelens Limited | Professional & scientific | 2025 |
| Chapel Garden Close Residents Management Limited | Households | 2024 |
| Charcott Close Residents Management Company Limited | Households | 2024 |
| Chartdale Limited | Professional & scientific | 1984 |
| Chatham Car Sales Limited | Extraterritorial | 2012 |
| Chaucer Consultancy Services Limited | Administrative & support | 2008 |
| Cherish Freedom | Administrative & support | 2013 |
| Cherrywood Place Management Company Limited | Households | 2025 |
| CHI Noodle Limited | Hospitality | 1999 |
| Children's Football Alliance Ltd | Arts & recreation | 2016 |
| Choice Projects Limited | Construction | 2021 |
| Chris ROE Limited | Hospitality | 2000 |
| Chubby Cheek Photography Ltd | Wholesale & retail | 2012 |
| Chuck Mobile Homes Limited | Wholesale & retail | 2016 |
| Church Crookham (Vistry) Management Company Limited | Households | 2022 |
| Churchsettle Homes Ltd | Construction | 2020 |
| Churchsettle Limited | Construction | 2012 |
| CIM Recruitment Limited | Administrative & support | 2009 |
| Cinedev Ltd | Information & communication | 2020 |
| Circle Care Partnership Ltd | Health & social care | 2022 |
| Cirpro Drone Surveys Limited | Professional & scientific | 2020 |
| Cirpro Limited | Professional & scientific | 2013 |
| Cirpro Properties Limited | Real estate | 2017 |
| City Elite Recruitment Ltd | Administrative & support | 2011 |
| City Horizon Research Limited | Professional & scientific | 2017 |
| CJH Group (UK) Ltd | Professional & scientific | 2026 |
| CJS Payroll Services Ltd | Administrative & support | 2016 |
| CJS Recruitment Ltd | Administrative & support | 2013 |
| Clare Warnham Ltd | Real estate | 2025 |
| Clarence Homes Limited | Professional & scientific | 2007 |
| Clarendon Holdings Limited | Financial services | 2019 |
| Claritis Limited | Information & communication | 2009 |