| Crafty Food Limited | Hospitality | 2025 |
| Craig Haulage Ltd | Transport & logistics | 2025 |
| Cranberg Security Ltd | Construction | 2021 |
| Crane Hire South East Limited | Extraterritorial | 2009 |
| Cranleigh Maintenance Limited | Households | 1959 |
| Cranmore Services Limited | Professional & scientific | 2018 |
| Craphago Limited | Health & social care | 2022 |
| Crawshaw Bailey Developments Limited | Real estate | 2018 |
| Crawshaw Bailey Essex Limited | Real estate | 2023 |
| Crawshaw Bailey Estates Limited | Real estate | 2016 |
| Crawshaw Bailey Group Limited | Administrative & support | 2019 |
| Crawshaw Bailey Holdings Limited | Administrative & support | 2016 |
| Crawshaw Bailey Industries Ltd | Administrative & support | 2009 |
| Crawshaw Bailey Site Management Limited | Administrative & support | 2016 |
| Crawshaw Bailey South East Limited | Real estate | 2018 |
| Crazy Aliens Theories Ltd | Information & communication | 2023 |
| Crazy Girls Collection Limited | Wholesale & retail | 2014 |
| Creame Kitchens Limited | Construction | 2023 |
| Creation Interactive Limited | Information & communication | 1998 |
| Creations by Nikolowa Ltd | Arts & recreation | 2024 |
| Creative and Numbers Ltd | Professional & scientific | 2018 |
| Creative Calm Therapy Ltd | Health & social care | 2024 |
| Creative Data Solutions Ltd | Information & communication | 2023 |
| Creative Discipline Ltd | Financial services | 2024 |
| Creative Field Consultancy Ltd | Information & communication | 2025 |
| Creative Field Productions Ltd | Information & communication | 2016 |
| Creative Field Properties Ltd | Real estate | 2022 |
| Creative Lynx Group Ltd | Professional & scientific | 2007 |
| Creative Lynx Limited | Professional & scientific | 2000 |
| Creative NOT Ltd | Professional & scientific | 2012 |
| Creative Partnership Limited | Information & communication | 2021 |
| Creative Solutions (Kent) Ltd | Administrative & support | 2018 |
| Creative Strategy Quizzes Ltd | Other services | 2024 |
| Creative Tomorrows | Arts & recreation | 2014 |
| Creator Beyond Ltd | Wholesale & retail | 2026 |
| Creatus Ltd | Manufacturing | 2002 |
| Credit Connect Media Ltd | Information & communication | 2016 |
| Credo Fitness Limited | Administrative & support | 2003 |
| Crescent Place Estate Management Limited | Real estate | 2022 |
| Cresco Construction Ltd | Construction | 2025 |
| Creston Homes Limited | Hospitality | 2026 |
| Crevaty Tax Consultancy UK Limited | Professional & scientific | 2022 |
| CRF Showjumping Ltd | Agriculture & fishing | 2021 |
| Criddle & Francis Properties Limited | Real estate | 2024 |
| Crilly Estate Holdings Limited | Real estate | 2026 |
| Crime Consulting Limited | Professional & scientific | 2012 |
| Cris Trans RO Ltd | Transport & logistics | 2020 |
| Crisp Designed Limited | Professional & scientific | 2009 |
| Crisp Visions Ltd | Information & communication | 2021 |
| Crispy Delights and Brew Ltd | Hospitality | 2024 |
| Crittenden Properties Limited | Real estate | 2025 |
| Cromnall Limited | Wholesale & retail | 1993 |
| Crompton Gardens Management Limited | Real estate | 1997 |
| Cross Street Studio Limited | Information & communication | 2014 |
| Crossfield Corp Ltd | Information & communication | 2026 |
| Crossfit Catford Limited | Arts & recreation | 2013 |
| Crossroads Care Kent | Health & social care | 1999 |
| Crossways (Sutton Valance) Management Company Ltd | Real estate | 2023 |
| Crossways Management Company Services Ltd | Administrative & support | 2021 |
| Crossworlder Music Ltd | Information & communication | 2012 |
| Crowborough Mobile Centre Limited | Other services | 2018 |
| Crown Property Improvements Ltd | Construction | 2012 |
| Crown Wooden Floors Limited | Construction | 2004 |
| Crownstone Estates Group Ltd | Real estate | 2025 |
| Crowther Creative Products Limited | Wholesale & retail | 2003 |
| CRR Property Investment Limited | Real estate | 2018 |
| CRS Trade Windows Limited | Construction | 2015 |
| Crundwell Associates Ltd | Professional & scientific | 2019 |
| Cryals Court Management Limited | Households | 1986 |
| Crystal Build Home Improvements Ltd | Construction | 2023 |
| Crystal Building Services Limited | Construction | 2016 |
| Crystal Cleans&Co Ltd | Administrative & support | 2025 |
| Crystal Cross Healthcare Limited | Health & social care | 2010 |
| Crystal View Services Ltd | Construction | 2022 |
| Crystalvista Window Cleaners Limited | Administrative & support | 2025 |
| CS Corporation Ltd | Information & communication | 2024 |
| Csis Charity Fund | Health & social care | 2007 |
| CSL Automotive Limited | Wholesale & retail | 2021 |
| CSM Scaffolding Ltd | Construction | 2019 |
| Csps Vehicle Leasing Ltd | Administrative & support | 2022 |
| CT Vehicle Solutions Ltd | Wholesale & retail | 2026 |
| CTA 2019 Ltd | Transport & logistics | 2019 |
| CTA Civils Ltd | Construction | 2017 |
| CTC Kent Ltd | Administrative & support | 2017 |
| CTG Carpentry & Construction Ltd | Manufacturing | 2018 |
| CTL Audiovisual Services Limited | Administrative & support | 1997 |
| CTO Solutions Limited | Professional & scientific | 2022 |
| Ctol Consulting Limited | Information & communication | 2011 |
| Cumberland Court (Westminster) Freehold Limited | Households | 2004 |
| Cumberland Court(Westminster)Tenants Association Limited | Extraterritorial | 1959 |
| Cunliffe&Co Ltd | Construction | 2022 |
| Cupcake Avenue Limited | Wholesale & retail | 2010 |
| Cuppa Productions Ltd | Information & communication | 2011 |
| Curacre Limited | Other services | 2018 |
| Curant Care Homes Limited | Health & social care | 2023 |
| Curant Staffing Solution Ltd | Health & social care | 2022 |
| Curate Your Day Ltd | Other services | 2023 |
| Curesponse UK Ltd | Professional & scientific | 2020 |
| Curious Fred Ltd | Construction | 2025 |
| Curlew Marketing Ltd | Other services | 2023 |