| Coordinated Consultancy Ltd | Transport & logistics | 2023 |
| Copnor Building Services Ltd | Construction | 2014 |
| Copper View Mews Limited | Households | 2017 |
| Copperwall Limited | Other services | 2019 |
| Coral Moon Tattoo Ltd | Arts & recreation | 2025 |
| Cordelia Tasker Architect Limited | Professional & scientific | 2020 |
| Core Skills Ltd | Other services | 2023 |
| Corevera Ltd | Administrative & support | 2026 |
| Cornell Health Limited | Health & social care | 2019 |
| Cornerman International Limited | Information & communication | 2025 |
| Cornerstone Design and Construction Limited | Construction | 2010 |
| Cornerstone Hampshire Ltd | Construction | 2020 |
| Cornerstone Healthcare Bristol Limited | Health & social care | 2020 |
| Cornerstone Healthcare Devco Limited | Financial services | 2020 |
| Cornerstone Healthcare Group Ltd | Financial services | 2018 |
| Cornerstone Healthcare Holdings Ltd | Financial services | 2018 |
| Cornerstone Healthcare Midco Limited | Financial services | 2020 |
| Cornerstone Management Services Limited | Professional & scientific | 2009 |
| Cornerstone Professional Services (UK) Limited | Administrative & support | 2011 |
| Cornerstone Services Holdings Limited | Financial services | 2022 |
| Cornwall Yonder Ltd | Construction | 2024 |
| Corporate Interior Design (UK) Ltd | Construction | 1995 |
| Corporate Projects UK Ltd | Professional & scientific | 2000 |
| Corporatewear International Ltd | Wholesale & retail | 2018 |
| Corpuskadzsovereign - Ethikal Investments Chancellery - Cksethikal Chambers Ltd | Financial services | 2021 |
| Correct Choice Ltd | Information & communication | 2012 |
| Corvi Capital Limited | Professional & scientific | 2024 |
| Cosgrove Painting and Decorating Limited | Construction | 2016 |
| Cosham Pets Limited | Wholesale & retail | 2019 |
| Costauric Ltd | Information & communication | 2025 |
| Cottonwood Close Purbrook Management Company Limited | Households | 2013 |
| Cougar Automation Limited | Professional & scientific | 1989 |
| Counter-Hostile Solutions Limited | Other services | 2024 |
| Counting Creators Ltd | Professional & scientific | 2023 |
| Country House Restaurants Limited | Hospitality | 2022 |
| Country Wealth Ltd | Professional & scientific | 2021 |
| County Building (Projects) Limited | Administrative & support | 2013 |
| Courtney and Walker Limited | Wholesale & retail | 1946 |
| Courtworx UK Ltd | Construction | 2023 |
| Couture Roofing & Guttering Ltd | Construction | 2024 |
| Covercraft Ltd | Extraterritorial | 2001 |
| Covert Homes Development Ltd | Real estate | 2024 |
| Covert Homes Limited | Real estate | 2024 |
| Cowling Legal Services Ltd | Professional & scientific | 2025 |
| Cowplain Activity Centre Limited | Hospitality | 1982 |
| Cowplain Barber Shop Limited | Other services | 2001 |
| Cowplain Collectables Ltd | Wholesale & retail | 2025 |
| Cowplain Day Nursery Limited | Health & social care | 2015 |
| Cowplain Island Limited | Hospitality | 2025 |
| Cowplain Properties Limited | Real estate | 2017 |
| COX Installations Ltd | Construction | 2015 |
| CP Business Consulting Limited | Professional & scientific | 2022 |
| CP Interior Solutions Ltd | Construction | 2020 |
| CP Properties Southern Ltd | Real estate | 2026 |
| CPB Kitchens Ltd | Construction | 2017 |
| CPG UK Investments Limited | Real estate | 2023 |
| CPH Decorating Ltd | Construction | 2019 |
| CPS Southern Limited | Construction | 2023 |
| CPW Conversions Ltd | Construction | 2015 |
| CQR 2 Ltd | Construction | 2025 |
| CR Interiors Ltd | Construction | 2023 |
| CR Makeup Limited | Other services | 2013 |
| Crabby's Coastal Decoration Ltd | Construction | 2026 |
| Crackingday Limited | Arts & recreation | 2007 |
| Craft Build Creations Ltd | Construction | 2025 |
| Crawford Accountants Limited | Professional & scientific | 2008 |
| Crawford Golf Ltd | Wholesale & retail | 2022 |
| Crayden Ltd | Construction | 2019 |
| Crazyforcoral Limited | Agriculture & fishing | 2025 |
| CRC Marine Engineering Services Ltd | Manufacturing | 2023 |
| Creatful CIC | Other services | 2021 |
| Creation Kitchen UK Ltd | Hospitality | 2024 |
| Creative Agile Limited | Professional & scientific | 2025 |
| Creative Forces UK CIC | Professional & scientific | 2026 |
| Credfeld Limited | Manufacturing | 2002 |
| Creech Consulting Limited | Professional & scientific | 2024 |
| Creed Group Limited | Real estate | 2019 |
| Creme Caravelle Limited | Wholesale & retail | 2019 |
| Criddell Ltd | Professional & scientific | 2024 |
| Crispclear Ltd | Real estate | 2018 |
| Cristal Clear Exterior Ltd | Administrative & support | 2026 |
| Critical Incident Intervention Ltd | Administrative & support | 2012 |
| Critical Projects Consultants (CPC) Limited | Professional & scientific | 2023 |
| Crofton Home Improvement Centre Limited | Construction | 2013 |
| Crofton Support Services Limited | Wholesale & retail | 2002 |
| Crofton Trees Ltd | Professional & scientific | 2018 |
| Cronin Building Management Limited | Construction | 2017 |
| Crookley Park Properties Limited | Real estate | 2011 |
| Cross Kitchen Emsworth Ltd | Hospitality | 2021 |
| Crosslight Medical Limited | Health & social care | 2025 |
| Crown & Bentley Asset Investment Management Limited | Professional & scientific | 2023 |
| Crown & Bentley Asset Management LLP | | 2019 |
| Crown & Bentley Investment Management Limited | Other services | 2019 |
| Croxford IT Services Limited | Information & communication | 2015 |
| Cruciform Ltd | Professional & scientific | 2024 |
| Crumps Carpentry Plus Ltd | Manufacturing | 2014 |
| Cryptonote Limited | Administrative & support | 2017 |
| Crystal Clear Accounting Services Limited | Professional & scientific | 2021 |
| Crystal Data Solutions Limited | Manufacturing | 2000 |
| CS Beauty Ltd | Other services | 2024 |