| Cornerstone Financial Management Ltd | Financial services | 2015 |
| Cornerstone Occupational Health Ltd | Health & social care | 2019 |
| Cornerstone Refurb Ltd | Construction | 2026 |
| Cornerstone Wealth Limited | Information & communication | 2023 |
| Corniche Financial Services Ltd | Financial services | 2018 |
| Cornish PUB Company Ltd | Hospitality | 2017 |
| CORO2A Healthcare Services Limited | Health & social care | 2022 |
| Corona Construction Ltd | Construction | 2013 |
| Coronado Holdings Limited | Wholesale & retail | 2003 |
| Corporate Comics Ltd | Professional & scientific | 2020 |
| Corporate Greetings UK Ltd | Wholesale & retail | 2019 |
| Corporate Medicals Ltd | Administrative & support | 2008 |
| Corporate Medics (UK) Limited | Extraterritorial | 2016 |
| Corporate Risk Associates Limited | Professional & scientific | 2000 |
| Corporate Service Apartments Ltd. | Real estate | 2015 |
| Corr Distribution Limited | Transport & logistics | 2009 |
| Corrigan Joinery and Building Services Ltd | Construction | 2020 |
| Corruption Bounce Ltd | Arts & recreation | 2024 |
| Cortana Logistics Limited | Transport & logistics | 2025 |
| Cortec Fabrications Ltd | Manufacturing | 2016 |
| Cortine Ltd | Wholesale & retail | 2025 |
| Corylus Testing Limited | Information & communication | 2025 |
| COS WE CAN Ltd | Wholesale & retail | 2026 |
| Cosaf Environments Limited | Construction | 1991 |
| Cosatto Limited | Wholesale & retail | 2008 |
| Cosgrove Flooring Limited | Construction | 2024 |
| Cosgroves Physio Centre Ltd | Health & social care | 2021 |
| Cosmetra Supply Ltd | Wholesale & retail | 2025 |
| Cosmos Rail and Civil Limited | Construction | 2018 |
| Cossy Transport Ltd | Transport & logistics | 2026 |
| Cost Effective Communications Limited | Information & communication | 2020 |
| Costa & Silva Holdings Limited | Financial services | 2026 |
| Cosymed Limited | Wholesale & retail | 2024 |
| Cotswold Barrett Ltd | Information & communication | 2024 |
| Cotterill Properties Ltd | Real estate | 2024 |
| Cotton Fitness Ltd | Other services | 2015 |
| Cougar Brent Home Finance Ltd | Financial services | 2006 |
| Cougar Capital Ltd | Real estate | 2016 |
| Coulson & Collins Care Home Ltd. | Health & social care | 2005 |
| Coulter Office Interiors Ltd | Administrative & support | 2002 |
| Counterpart Systems Limited | Information & communication | 2016 |
| Countmore Limited | Real estate | 1984 |
| Country Ride UK Ltd | Transport & logistics | 2025 |
| County GAS Services Ltd | Construction | 2024 |
| County Handyman Ltd | Construction | 2022 |
| Coupe Farms Limited | Agriculture & fishing | 1996 |
| Couper Consultancy Ltd | Professional & scientific | 2024 |
| Couples Bond Ltd | Information & communication | 2025 |
| Courierhawk Services Limited | Transport & logistics | 2024 |
| Couriers Specialist Limited | Transport & logistics | 2025 |
| Courtesy of the Company Ltd | Manufacturing | 2025 |
| Courtyard 36 Limited | Hospitality | 2018 |
| Cove Teahouse Ltd | Hospitality | 2026 |
| Coveleaf Properties Limited | Real estate | 2024 |
| Cowell Properties Limited | Real estate | 2023 |
| Cowgills Business Recovery Limited | Administrative & support | 2023 |
| Cowgills Corporate Finance Limited | Financial services | 2000 |
| Cowgills Funding Limited | Administrative & support | 2023 |
| Cowgills Limited | Professional & scientific | 2023 |
| Cowgills Transaction Services Limited | Financial services | 2021 |
| Cowgills Whittle Limited | Professional & scientific | 2022 |
| COX Green Solutions Ltd | Professional & scientific | 2017 |
| Cozy Homes (Bolton) Ltd | Real estate | 2023 |
| Cozy Lettings Limited | Real estate | 2019 |
| Cozy Life Supplies Limited | Wholesale & retail | 2025 |
| Cozyzen Ltd | Wholesale & retail | 2025 |
| CP Brickwork (NW) Ltd | Construction | 2012 |
| CP Express Global Ltd | Transport & logistics | 2026 |
| CP Fitness Holdings Limited | Financial services | 2023 |
| CP Fitness Limited | Professional & scientific | 2020 |
| CP Plastering NW Ltd | Construction | 2025 |
| CPA Construction & Fit OUT Solutions Limited | Professional & scientific | 2020 |
| Cpaa (UK) | Other services | 1994 |
| CPB Living Ltd | Real estate | 2022 |
| CPC Advisory Limited | Administrative & support | 2021 |
| CPD Communications Ltd | Information & communication | 2021 |
| CPH Haulage Services Limited | Transport & logistics | 2026 |
| CPH Northern Ltd | Construction | 2015 |
| CPL Solutions Ltd | Administrative & support | 2017 |
| CPM (Cost and Project Management Services) Ltd | Professional & scientific | 2023 |
| Cpme Services Limited | Professional & scientific | 2009 |
| Cpmg (Hire) Limited | Wholesale & retail | 2013 |
| Cpms Northwest Limited | Construction | 2015 |
| CPR Electrical Services Ltd | Construction | 2025 |
| CPS Electrical Services Limited | Construction | 2025 |
| CPS Football Academy Limited | Arts & recreation | 2020 |
| CPS Franchising Limited | Arts & recreation | 2024 |
| CQ Aesthetics Limited | Other services | 2022 |
| CR Systems & Consulting Limited | Information & communication | 2019 |
| CR Transport Services (West Midlands) Limited | Transport & logistics | 2023 |
| CR Waste Removals Ltd | Water & waste | 2025 |
| CR15 Media Ltd | Information & communication | 2022 |
| CR8TIVE Digital Ltd | Information & communication | 2018 |
| CRA Offshore Limited | Professional & scientific | 2017 |
| Crack IT Limited | Arts & recreation | 2016 |
| Craft & Calm Ltd | Construction | 2025 |
| Craft and Stitch Ltd | Wholesale & retail | 2015 |
| Craft Compliance Limited | Administrative & support | 2020 |
| Craft Wool & Thread Co Ltd | Wholesale & retail | 2012 |
| Crafted Properties & Holdings Ltd | Real estate | 2019 |