| Cloud Tech Mobile Ltd | Wholesale & retail | 2026 |
| Cloud Vape Mini Market Ltd | Wholesale & retail | 2025 |
| Cloud Voice Ltd | Information & communication | 2025 |
| Cloud Walker Homes Ltd | Real estate | 2019 |
| Cloud Walker Management Ltd | Real estate | 2024 |
| CLOUD8 Consulting Ltd | Information & communication | 2024 |
| CLOUD9 Fulfilment Limited | Transport & logistics | 2020 |
| CLOUD9 Media Productions Limited | Information & communication | 2022 |
| CLOUD96 Ltd | Information & communication | 2026 |
| Cloudathlete Limited | Information & communication | 2025 |
| Cloudberry Business Services Ltd | Administrative & support | 2014 |
| Cloudmaze IT Ltd | Information & communication | 2024 |
| Cloudround Consulting Limited | Information & communication | 2025 |
| Clouds Logistics Limited | Transport & logistics | 2025 |
| Cloudtel Global Ltd | Information & communication | 2021 |
| Cloughfields Education and Training CIC | Education | 2024 |
| Cloughfields Equestrian Centre Limited | Agriculture & fishing | 2017 |
| Cloughfields Riding School Limited | Agriculture & fishing | 2019 |
| Clover 288 Ltd | Other services | 2025 |
| Clover Acoustics Limited | Administrative & support | 2010 |
| Clover Homecare Limited | Health & social care | 2025 |
| Cloverleaf Court Management Company Limited | Households | 2021 |
| CLP Automotive Limited | Wholesale & retail | 2013 |
| CLR Residential Limited | Real estate | 2023 |
| CLS Foodie Ltd | Hospitality | 2023 |
| Club 200 Ltd | Transport & logistics | 2022 |
| Club 400 Ltd | Arts & recreation | 2025 |
| Club 61 Limited | Health & social care | 2022 |
| Club FC Ltd | Wholesale & retail | 2025 |
| Club Rampage Ltd | Arts & recreation | 2025 |
| Club Venus Limited | Other services | 2018 |
| Clubhouse Yorkshire Limited | Hospitality | 2026 |
| Clubinn Together Limited | Wholesale & retail | 2017 |
| Clublease One Limited | Hospitality | 2021 |
| Clublease Operators Limited | Real estate | 2014 |
| Clublease Two Limited | Real estate | 2021 |
| Clubs Limited | Hospitality | 1988 |
| Cluckn & Crust Limited | Hospitality | 2025 |
| Cluckncrust Ltd | Hospitality | 2025 |
| Clulee IT Services Limited | Information & communication | 2009 |
| Clumber Auction House Ltd | Wholesale & retail | 2025 |
| Clumsyorcstudios Ltd | Construction | 2021 |
| CLW Interiors Limited | Construction | 2019 |
| Clyde Pumps Limited | Extraterritorial | 1955 |
| Clydesdale Roofing Supplies (Leyland) Limited | Extraterritorial | 1981 |
| CM Builders and Bricklayers Ltd | Construction | 2023 |
| CM Haulage Ltd | Transport & logistics | 2020 |
| CM Interiors (South Yorkshire) Limited | Construction | 2024 |
| Cm&R Ltd | Administrative & support | 2024 |
| CMA S10 Limited | Hospitality | 2025 |
| Cmak Properties Ltd | Real estate | 2022 |
| Cmas Properties Limited | Real estate | 2013 |
| Cmas Technologies Ltd | Information & communication | 2013 |
| CMB Solutions Limited | Wholesale & retail | 2020 |
| CMC Plastic Surgery Limited | Health & social care | 2009 |
| CMC Project Services Ltd | Construction | 2024 |
| CMC Property Solutions Ltd | Real estate | 2011 |
| Cmgb Properties Limited | Real estate | 2011 |
| CMH Property Investments Limited | Real estate | 2019 |
| CML Premises Limited | Professional & scientific | 2006 |
| Cmnd Building Ltd | Construction | 2024 |
| Cmpound Ltd | Information & communication | 2023 |
| CMS Acquisitions Ltd | Real estate | 2023 |
| CMS Brothers Ltd | Transport & logistics | 2026 |
| CMS Danskin Acoustics Limited | Extraterritorial | 1990 |
| CMS Direct Management Ltd | Professional & scientific | 2010 |
| CMT Fabrications Limited | Construction | 2023 |
| Cmyk Solutions Ltd | Manufacturing | 2020 |
| Cnas Investments Ltd | Real estate | 2026 |
| CNC Medic Ltd | Manufacturing | 2023 |
| Cnergy Capital Limited | Information & communication | 2021 |
| CNN Medicals Ltd | Health & social care | 2023 |
| CNP Consulting Ltd | Professional & scientific | 2016 |
| Cnrs Consulting Ltd | Professional & scientific | 2020 |
| CNV Holdings Ltd | Financial services | 2025 |
| Co & Alessia Ltd | Transport & logistics | 2014 |
| Co Dining Ltd | Hospitality | 2017 |
| Co Habitats Property Ltd | Real estate | 2019 |
| Co Lettings Ltd | Real estate | 2024 |
| Co Transport Ltd | Transport & logistics | 2018 |
| Co-Analysis Ltd | Information & communication | 2025 |
| Co-Lab 3 Limited | Professional & scientific | 2026 |
| Co.Lab Education Ltd | Information & communication | 2022 |
| Coach & Horses 2025 Ltd | Hospitality | 2025 |
| Coach Pro UK Ltd | Transport & logistics | 2020 |
| Coached by Cheryl Ltd | Arts & recreation | 2018 |
| Coached by Frank Ltd | Education | 2024 |
| Coached by Georgie Limited | Arts & recreation | 2020 |
| Coached by Paige Ltd | Education | 2024 |
| Coachedbykb Ltd | Education | 2026 |
| Coaching Excellence Ltd | Professional & scientific | 2000 |
| Coaching Skills Ltd | Information & communication | 2010 |
| Coachio.Fit Ltd | Information & communication | 2019 |
| Coal & Clay Ltd | Hospitality | 2024 |
| Coal Pension (Securities) Nominees Limited | Professional & scientific | 1990 |
| Coal Pension Trustees Investment Limited | Financial services | 2010 |
| Coal Pension Trustees Services Limited | Financial services | 1994 |
| Coal Staff Superannuation Scheme Trustees Limited | Financial services | 1994 |
| Coalition OFF Grid Limited | Manufacturing | 2025 |
| Coalition Vans Ltd | Manufacturing | 2022 |