| Copperfield Court Residents Company Limited | Professional & scientific | 2013 |
| Copperwood FM Solutions Limited | Professional & scientific | 2018 |
| Corbyn and Co. Properties Limited | Administrative & support | 2016 |
| Cordery Collection Limited | Wholesale & retail | 2024 |
| Core Refurb Group (North Division) Ltd | Construction | 2025 |
| Core Refurb Group (UK) Ltd | Construction | 2022 |
| Core Studio Gym Ltd | Arts & recreation | 2021 |
| Corestru Construction Ltd | Construction | 2026 |
| Cork Ltd | Wholesale & retail | 2017 |
| Cornelius Photographic Ltd | Professional & scientific | 2019 |
| Cornerstone Cyber & Risk Consulting Limited | Professional & scientific | 2020 |
| Cornerstone Global Risk Group Limited | Financial services | 2020 |
| Cornerstone GRG Limited | Professional & scientific | 2007 |
| Cornerstone Grgeot Limited | Extraterritorial | 2024 |
| Cornerstone Security Consultants Ltd | Professional & scientific | 2020 |
| Cornerstone Security Consulting Limited | Professional & scientific | 2020 |
| Cornfield Properties Limited | Real estate | 2025 |
| Cornwell Products Packaging Limited | Wholesale & retail | 1999 |
| Corporate Cannibal Ltd | Extraterritorial | 2020 |
| Corporate Couriers Limited | Transport & logistics | 2019 |
| Cosmic Waste Management Ltd | Water & waste | 2024 |
| Cosmos Consulting Limited | Information & communication | 2015 |
| Cost and Commercial Management Ltd | Hospitality | 2017 |
| Coste Construction Ltd | Construction | 2021 |
| Cotech Enterprises Limited | Information & communication | 2009 |
| Cotex Management Limited | Construction | 2005 |
| Coulstock & Place Engineering Co Limited | Manufacturing | 1986 |
| Counselling Victoria Ltd | Real estate | 2022 |
| Coup DE Maitre Limited | Professional & scientific | 2016 |
| Courchevel Horseboxes Ltd | Manufacturing | 2010 |
| Courtland 123 Ltd | Construction | 2023 |
| Courtlands of Harlow Ltd | Water & waste | 2015 |
| Courtyard Investment and Securities Ltd | Construction | 2022 |
| Cousins Electrical Services Limited | Construction | 2019 |
| Cousins Roofing & Building Limited | Construction | 2015 |
| Cousins Roofing & Building Services (Holdings) Ltd | Financial services | 2025 |
| Cousins Roofing & Building Services Ltd | Construction | 2022 |
| Covenant Consultancy Limited | Health & social care | 2023 |
| Covent Garden Market-Ing Limited | Professional & scientific | 2016 |
| Covered Infinities Limited | Arts & recreation | 2008 |
| Covert Technology Services Limited | Information & communication | 2019 |
| Cowdery Tech Consulting Ltd | Information & communication | 2026 |
| Coxheath Takaway & Functions Ltd | Hospitality | 2023 |
| CPF Heating Services Ltd | Construction | 2021 |
| CPI Logistics Ltd | Extraterritorial | 2021 |
| CPM Accountants Limited | Professional & scientific | 2018 |
| CPM Building Maintenance Ltd | Construction | 2025 |
| CPM Drainage Solutions Limited | Construction | 2024 |
| CPM Fire & Electrical Solutions Ltd | Construction | 2023 |
| CPM FM & Building Services Ltd | Construction | 2022 |
| CPM Holdings (SE) Limited | Real estate | 2023 |
| CPM Investments (SE) Limited | Real estate | 2019 |
| CPM Management Ltd | Construction | 2025 |
| CPM Residential Care Ltd | Health & social care | 2026 |
| CQ Worktops Ltd | Manufacturing | 2019 |
| Crago Auto Repairs Limited | Wholesale & retail | 2013 |
| Craig Parker Ltd | Real estate | 2020 |
| Cranford House (Crayford) Management Limited | Real estate | 2014 |
| Cranford Resources Limited | Information & communication | 2014 |
| Craydene Consult Limited | Financial services | 2019 |
| Crayford Arrows Hospitality Limited | Hospitality | 2024 |
| Crayford Arrows Sports Club Limited | Arts & recreation | 1998 |
| Crayford Auto Centre Limited | Wholesale & retail | 2019 |
| Crayford Express Ltd. | Transport & logistics | 2016 |
| Crayford Food & Wine Ltd | Wholesale & retail | 2019 |
| Crayford Kitchen Limited | Hospitality | 2026 |
| Crayford Savs Barbers Limited | Other services | 2024 |
| Crayford Tile Centre Ltd | Wholesale & retail | 2021 |
| CRE8UK Ltd. | Information & communication | 2019 |
| Creative I London Limited | Hospitality | 2025 |
| Creative IT Consultancy Limited | Information & communication | 2013 |
| Creative Music X Ltd | Information & communication | 2020 |
| Creative Production Group Limited | Manufacturing | 2019 |
| Creative Sapphire Ltd | Construction | 2017 |
| Creative Storage Solutions Limited | Administrative & support | 2007 |
| Creed Tax Advisers Ltd | Professional & scientific | 2018 |
| Creekside Greenwich Ltd | Construction | 2018 |
| Creekside Investment Ltd | Construction | 2018 |
| Crescenda Sport Limited | Education | 2014 |
| Crew Estates Ltd | Real estate | 2022 |
| Crisluca Ltd | Transport & logistics | 2020 |
| Cristian Catargiu Limited | Construction | 2017 |
| CRJ Brickwork & Building Ltd | Construction | 2025 |
| Crjb Limited | Real estate | 2017 |
| Croindene Media Ltd | Professional & scientific | 2022 |
| Cross Cable Offshore Ltd | Professional & scientific | 2022 |
| Crosswater Limited | Wholesale & retail | 1998 |
| Crossway Lift Services Ltd | Manufacturing | 2022 |
| Crossways (Dartford) Limited | Real estate | 2009 |
| Crossways Community Projects CIC | Other services | 2023 |
| Crossways Composites Limited | Extraterritorial | 2024 |
| Crossways Galleon Lake Limited | Real estate | 2011 |
| Crossways Mechanical Limited | Construction | 2018 |
| Crossways NJS Limited | Construction | 2011 |
| Crowdfighter Ltd | Arts & recreation | 2024 |
| Crown & Flame Limited | Hospitality | 2025 |
| Crown Global Marketing Ltd | Professional & scientific | 2025 |
| Crown House Technologies Limited | Construction | 2004 |
| Crown Inspiration Limited | Financial services | 2021 |
| Crown Point Builders Ltd | Construction | 2020 |