| Courtesyfair Limited | Extraterritorial | 1998 |
| Courtlands Drive Block "K" Management Company Limited | Households | 1991 |
| Courtlands Drive Block "M" Management Company Limited | Households | 1991 |
| Courtlands Drive Blocks "G,H & I" Management Company Limited | Households | 1991 |
| Coutts Medical Limited | Health & social care | 2015 |
| Cova Concepts Ltd | Manufacturing | 2025 |
| Covalent Executive Search Limited | Administrative & support | 2024 |
| Cove Watersports Limited | Arts & recreation | 2026 |
| Covec Limited | Administrative & support | 2011 |
| Covenant Church | Other services | 2015 |
| Coversense Ltd | Information & communication | 2026 |
| Covid Testing Network Ltd | Wholesale & retail | 2020 |
| Covx Property Limited | Real estate | 2023 |
| Cowgirl Ltd | Arts & recreation | 2024 |
| COX & Co Cleaners Ltd | Other services | 2016 |
| Coxford RTM Company Limited | Households | 2026 |
| Cozens International Ltd | Information & communication | 2008 |
| Cozens Leasehold Ltd | Real estate | 2026 |
| Cozens Property Limited | Real estate | 2018 |
| Cozy Breaks Ltd | Hospitality | 2023 |
| Cozy Lets Management Ltd | Hospitality | 2023 |
| CP Estate Agent Ltd | Real estate | 2025 |
| CP Legal Limited | Professional & scientific | 2025 |
| CP Nexus Ltd | Real estate | 2018 |
| CPA First Recruitment Ltd | Administrative & support | 2025 |
| CPB Building Contractors Ltd | Construction | 2023 |
| CPC Building Contractors Ltd | Construction | 2020 |
| CPD Painting and Decorating Ltd | Construction | 2022 |
| CPG Accounting Services Limited | Professional & scientific | 2002 |
| CPH Couriers Ltd | Transport & logistics | 2023 |
| CPH Training Support Ltd | Education | 2025 |
| CPL Software (UK) Ltd | Information & communication | 2014 |
| CPM Solutions Limited | Information & communication | 2012 |
| Cpmc Surveying Ltd | Information & communication | 2009 |
| CPS Maintenance Ltd | Administrative & support | 2019 |
| CPS Plastering Services Ltd | Construction | 2020 |
| CPT Portal Ltd | Information & communication | 2023 |
| Cqfd (UK) Limited | Wholesale & retail | 2009 |
| Cqfd Profiles Limited | Wholesale & retail | 2016 |
| CR Potential Ltd | Administrative & support | 2024 |
| CR001 Limited | Hospitality | 2021 |
| CR7 Goat Ltd | Hospitality | 2024 |
| Crabby CAB Ltd | Transport & logistics | 2024 |
| Crackerdash Ltd | Manufacturing | 2020 |
| Cracknell Consulting Limited | Professional & scientific | 2022 |
| Craft Bar Services Ltd | Arts & recreation | 2017 |
| Crafted Edge Project Management Ltd | Professional & scientific | 2023 |
| Craftline Shipping Ltd | Transport & logistics | 2015 |
| Craig Mitcham Joinery Ltd | Construction | 2019 |
| Craigbrook Limited | Households | 1989 |
| Craigorn Ltd | Real estate | 2021 |
| Crale Limited | Transport & logistics | 2024 |
| Crammed Inn (Southampton) Ltd | Hospitality | 2019 |
| Crampton-Barden Ltd | Professional & scientific | 2001 |
| Cranbury Court Management Limited | Households | 1986 |
| Cranbury CT and Rockstone CT RTM Company Limited | Households | 2026 |
| Cranbury's Limited | Professional & scientific | 1997 |
| Crandell Refurbishment Limited | Construction | 2009 |
| Cranemere Africa Limited | Administrative & support | 2016 |
| Cranford Limited | Administrative & support | 2020 |
| Cranleigh Home Improvements Ltd | Construction | 2019 |
| Cranleigh House Management Company Limited | Households | 1988 |
| Cranley Gardens Property Limited | Real estate | 2022 |
| Cranman Limited | Households | 1982 |
| Crantech Remote Staff Ltd | Information & communication | 2025 |
| Crantock Bars Limited | Hospitality | 2024 |
| Cravebox Vending Ltd | Wholesale & retail | 2026 |
| Craydown Investments Limited | Financial services | 2018 |
| Craze Toys Ltd | Wholesale & retail | 2022 |
| Crazy About Horses Ltd | Administrative & support | 2018 |
| Crbconsultation Limited | Administrative & support | 2025 |
| CRE8IVE Spirits Ltd | Hospitality | 2024 |
| CRE8IVE-CONSTRUCTO Limited | Construction | 2013 |
| Cream Hair Design Limited | Other services | 2005 |
| Creams Cafe Orpington Limited | Hospitality | 2015 |
| Create Food Limited | Hospitality | 1993 |
| Create XR Ltd | Information & communication | 2024 |
| Create Your Brand Limited | Professional & scientific | 2025 |
| Creatifa Ltd | Construction | 2019 |
| Creation Industries AREA51 Gym Ltd | Arts & recreation | 2019 |
| CREATION7 Limited | Professional & scientific | 2025 |
| Creative Dynamics Rights Management Limited | Arts & recreation | 2023 |
| Creative Electrical Solutions Ltd | Construction | 2016 |
| Creative Kidz Childcare Ltd | Health & social care | 2018 |
| Creative Leopard Ltd | Professional & scientific | 2011 |
| Creative Lifestyle Planning Ltd | Financial services | 2020 |
| Creative Marine Carpentry Ltd | Manufacturing | 2019 |
| Creative Monitoring Limited | Health & social care | 2015 |
| Creative Skidz Limited | Information & communication | 2016 |
| Creative Studios Art Workshops and Branding Ltd | Arts & recreation | 2023 |
| Creative Supply Chain Consultancy Limited | Professional & scientific | 2023 |
| Creativefix Advertising Services Limited | Professional & scientific | 2024 |
| Creativevents Limited | Hospitality | 1997 |
| Creature London Limited | Professional & scientific | 2010 |
| Credality Limited | Professional & scientific | 2026 |
| Credibuild Limited | Construction | 2011 |
| Creditabilty Ltd | Information & communication | 2025 |
| Creditmarket Ltd | Administrative & support | 2001 |
| Creese Consulting Limited | Information & communication | 2015 |
| Creighton Building Contractors Ltd | Construction | 2012 |