| Creative Grounds Cafe Limited Liability Partnership | | 2025 |
| Creative Guns Ltd | Information & communication | 2023 |
| Creative Home Investments Ltd | Real estate | 2021 |
| Creative Pet Alliance UK Limited | Wholesale & retail | 2017 |
| Creative Places LLP | | 2008 |
| Creative Stallion Ltd | Information & communication | 2026 |
| Creative Therapy Space Ltd | Manufacturing | 2023 |
| Creatively Clear Ltd | Professional & scientific | 2022 |
| Creature Labs Ltd. | Other services | 2004 |
| Cred Group Limited | Financial services | 2020 |
| Credible Capital Limited | Wholesale & retail | 2021 |
| Creditworthy International Trading Co., Ltd | Extraterritorial | 2021 |
| Creme DE LA Creme Limited | Administrative & support | 2015 |
| Crescendo Biologics Limited | Professional & scientific | 2007 |
| Crescent Hill Media Limited | Professional & scientific | 2025 |
| Crescent Solus Ltd | Wholesale & retail | 2025 |
| Crescent Technology Co., Ltd | Wholesale & retail | 2023 |
| Crespo Laminating Ltd | Wholesale & retail | 2026 |
| Cresswell Close Management Company Limited | Households | 2016 |
| Crest Education Limited | Education | 2015 |
| Crest Health Limited | Health & social care | 2012 |
| Crest Parks Limited | Hospitality | 2023 |
| Crestech Electronics Co., Ltd | Extraterritorial | 2012 |
| Crestex Limited | Construction | 2023 |
| Crestwood Technology Limited | Information & communication | 2026 |
| Cretemore Ltd | Real estate | 2002 |
| CRG Auto Group Limited | Extraterritorial | 2024 |
| Crharding Autos Ltd | Wholesale & retail | 2025 |
| Cricketers Thai Ltd | Hospitality | 2026 |
| Crickmore Holdings Limited | Professional & scientific | 2004 |
| Crickmore Parks Limited | Real estate | 1964 |
| Cril Nominees Limited | Administrative & support | 2004 |
| Crimson Control Ltd | Manufacturing | 2026 |
| Crimson Harvest (Private Client) Limited | Administrative & support | 2015 |
| Crimson Harvest Limited | Professional & scientific | 2001 |
| Crimson Traders Limited | Information & communication | 2020 |
| Crisp Digital Innovation Ltd | Professional & scientific | 2026 |
| Crispflint Limited | Information & communication | 1985 |
| Crista Clarus Ltd | Professional & scientific | 2020 |
| Cristian & Gabriel Building Ltd | Construction | 2020 |
| Cristian Maintenance Ltd | Manufacturing | 2025 |
| Cristian Mihai Ltd | Manufacturing | 2026 |
| Cristian SRL Ltd | Manufacturing | 2026 |
| Cristian's Driving School Ltd | Education | 2026 |
| Criterion Audio Limited | Wholesale & retail | 2019 |
| Critical Maritime Systems & Support Limited | Manufacturing | 1969 |
| Critical Pressure Limited | Professional & scientific | 2017 |
| Criticalzero Ltd | Professional & scientific | 2025 |
| CRL Energy Ltd | Construction | 2023 |
| Crocodilligator Ltd | Information & communication | 2025 |
| Crofters Court (Oakham) Management Company Limited | Households | 2005 |
| Crofton Residential Ltd | Real estate | 2018 |
| Croggan Ltd | Professional & scientific | 2000 |
| Crolla Massey Ltd | Wholesale & retail | 2025 |
| Crolla Studio Limited | Professional & scientific | 2025 |
| Cromwell Convenience Limited | Wholesale & retail | 2026 |
| Cromwell Fields Residents Management Company Limited | Households | 2020 |
| Cromwell Food Ltd | Hospitality | 2025 |
| Cromwell Ventures Limited | Real estate | 1989 |
| Cronos Ltd | Manufacturing | 2024 |
| Crop Development CAM Limited | Wholesale & retail | 2023 |
| Crops for the Future (UK) CIC | Agriculture & fishing | 2020 |
| Cropstar Limited | Agriculture & fishing | 2007 |
| Cross Composite Ltd | Manufacturing | 2023 |
| Cross Culture Consultancy Ltd | Information & communication | 2025 |
| Cross Perform Limited | Arts & recreation | 2020 |
| Cross Road Management Limited | Households | 2024 |
| Cross ST Studios Ltd | Information & communication | 2020 |
| Cross Technical Services Limited | Professional & scientific | 2017 |
| Cross Validation Limited | Information & communication | 2016 |
| Crossbridge Scientific Limited | Manufacturing | 2014 |
| Crossing Horizon Trading Co., Ltd. | Wholesale & retail | 2025 |
| Crossmans MTA Solicitors LLP | | 2008 |
| Crossways House Management Limited | Real estate | 1983 |
| Crosure Limited | Information & communication | 2017 |
| Crown & Scepter Ltd | Wholesale & retail | 2024 |
| Crown CB Limited | Construction | 2025 |
| Crown Equity Ltd | Financial services | 2020 |
| Crown Inns & Dining Ltd | Hospitality | 2025 |
| Crown Wharf London (UK) Ltd | Real estate | 2022 |
| Crownmax Limited | Real estate | 1996 |
| Crucial Spark Ltd | Extraterritorial | 2008 |
| Crunch on Crunch Ltd | Wholesale & retail | 2023 |
| Crusader Motor Services Ltd | Wholesale & retail | 2008 |
| Cruse Consultancy Limited | Information & communication | 2006 |
| Crvetdi Limited | Professional & scientific | 2022 |
| Cryptic Squid Two Ltd | Manufacturing | 2021 |
| Cryptowings Limited | Information & communication | 2025 |
| Crystal Clear Cambridge Ltd | Education | 2024 |
| Crystal Development Limited | Real estate | 1984 |
| Crystalline Software Limited | Information & communication | 2009 |
| CS Energy Tech Co., Ltd | Manufacturing | 2026 |
| CS Gold Limited | Professional & scientific | 2023 |
| CS International Trading Co., Ltd. | Wholesale & retail | 2025 |
| CS Intro Services Ltd | Professional & scientific | 2023 |
| CSA Driver Solution Ltd | Transport & logistics | 2016 |
| CSA Dynamycs Parts Ltd | Manufacturing | 2024 |
| CSC Automotive Limited | Wholesale & retail | 2008 |
| CSC Developments Ltd. | Administrative & support | 2021 |
| CSG Art Limited | Wholesale & retail | 2023 |