| Cookie Machine Limited | Hospitality | 2020 |
| Coolshot Limited | Professional & scientific | 1987 |
| Cooper Builders (Charnwood) Limited | Construction | 1948 |
| Cooper Construction and Developments Ltd | Construction | 2021 |
| Cooperable Limited | Professional & scientific | 2022 |
| Cope Children's Trust | Health & social care | 1992 |
| Cope Marketing Limited | Extraterritorial | 1996 |
| Copestone Event Support Limited | Professional & scientific | 2003 |
| Copy,Edit and Proof Ltd | Administrative & support | 2025 |
| CORE5 Developments Limited | Real estate | 2018 |
| Corpar Education Ltd | Education | 2023 |
| Corpar Holdings Ltd | Financial services | 2023 |
| Corporate Security & Safety Ltd | Administrative & support | 2011 |
| Correctly Clean Ltd | Administrative & support | 2025 |
| Corvum LLP | | 2021 |
| Corvus Building Solutions Ltd | Construction | 2013 |
| Cosaur Limited | Transport & logistics | 2015 |
| Cosmic Europe Ltd | Administrative & support | 2007 |
| Costa Connect Ltd | Real estate | 2025 |
| Costock Property Services Limited | Administrative & support | 2017 |
| Cotton Clara Limited | Wholesale & retail | 2020 |
| Cougar Aesthetics Ltd | Other services | 2026 |
| Cound & Co Limited Liability Partnership | | 2008 |
| Cound Probate Services Limited | Professional & scientific | 2015 |
| Country Abodes Limited | Manufacturing | 2020 |
| Country Baskets Imports Limited | Wholesale & retail | 2020 |
| Country Baskets Stores Limited | Wholesale & retail | 2020 |
| Countryside Dream Ltd | Information & communication | 2017 |
| Countryside Enterprises CIC | Other services | 2016 |
| Countryside Estates Limited | Construction | 1974 |
| County Display (Leicester) Holdings Limited | Financial services | 2018 |
| County Fire Marshals Ltd | Education | 2025 |
| County Property Management Ltd | Real estate | 2022 |
| County Safeguarding Ltd | Education | 2022 |
| Courtney Pianos Limited | Wholesale & retail | 1991 |
| Cousins Fencing Limited | Administrative & support | 2024 |
| Coverpax Limited | Manufacturing | 2007 |
| COX Web Design Ltd | Information & communication | 2017 |
| Cozi Living Ltd | Wholesale & retail | 2018 |
| CP Composites Ltd | Manufacturing | 2023 |
| Cpcm Consultancy Limited | Professional & scientific | 2014 |
| CPJ Midlands Limited | Financial services | 2021 |
| Cpmss Agro Allied Limited | Professional & scientific | 2024 |
| CPS Property Investments Limited | Real estate | 2021 |
| CPW Accountancy Ltd | Professional & scientific | 2017 |
| CPW Tax Services Ltd | Professional & scientific | 2019 |
| CR DEV Co 1 Limited | Construction | 2025 |
| CR Property Ventures Ltd | Construction | 2025 |
| CR46 Limited | Information & communication | 2015 |
| Craft Beer Snacks Ltd | Hospitality | 2020 |
| Craig MAY Limited | Construction | 2026 |
| Craig Stubley Limited | Professional & scientific | 2012 |
| Crampton Ltd | Professional & scientific | 1997 |
| Crave Catering Ltd | Hospitality | 2010 |
| Craven Carr Limited | Real estate | 2014 |
| Crawford Healthcare Holdings Limited | Professional & scientific | 2009 |
| Crawford Healthcare Limited | Professional & scientific | 1996 |
| Crayfish Design Ltd | Other services | 2004 |
| Creating Food Meteorites Ltd | Professional & scientific | 2020 |
| Creative Health Ltd | Education | 2015 |
| Creative Initiatives CIC | Professional & scientific | 2020 |
| Creative Leisure Events Limited | Arts & recreation | 2016 |
| Creator Being Ltd | Wholesale & retail | 2023 |
| Creosote Sales Limited | Wholesale & retail | 2012 |
| Cresta Roofing Services Limited | Construction | 2000 |
| Crestline Printers Limited | Manufacturing | 1983 |
| Crestmount Systems Ltd | Professional & scientific | 2006 |
| Crisp Land Developments Limited | Real estate | 2007 |
| Critical 10TH Ltd | Information & communication | 2025 |
| CRL World Wide Limited | Professional & scientific | 2025 |
| Crobro and Co (Derby) Ltd | Extraterritorial | 2008 |
| Crobro and Co Ltd | Professional & scientific | 2019 |
| Croft Paving and Landscaping Ltd | Administrative & support | 2022 |
| Cromaston Limited | Manufacturing | 2008 |
| Cromerix Ltd | Professional & scientific | 2021 |
| Cropston Contracts Ltd | Construction | 2016 |
| Cropston Properties Limited | Construction | 2016 |
| Cross & Sansam Limited | Professional & scientific | 1950 |
| Cross and Sansam (Holdings) Limited | Financial services | 2026 |
| Cross Heatpumps Limited | Construction | 2025 |
| Crossways Auto Care Ltd | Wholesale & retail | 2024 |
| Crown Apartments (Loughborough) Limited | Real estate | 2010 |
| Crown Apartments (Loughborough) Management Company Limited | Real estate | 2006 |
| Crown Bioscience UK Limited | Professional & scientific | 2009 |
| Crown Cars (Rhos) Limited | Transport & logistics | 2023 |
| Crown Engineers Ltd | Professional & scientific | 2019 |
| Croxley Ltd | Construction | 2017 |
| Croysdale Engineering Services Ltd. | Manufacturing | 2011 |
| CRS Electrics Limited | Construction | 2024 |
| Crux Climbing 74 Ltd | Wholesale & retail | 2025 |
| CRW Property & Investments Ltd | Real estate | 2024 |
| Crwj Holdings Limited | Professional & scientific | 2008 |
| Crystal Cleans Commercials Limited | Administrative & support | 2025 |
| Crystalclear Aspects Limited | Professional & scientific | 2003 |
| CS Attachments Limited | Manufacturing | 2014 |
| CS Auto Engineering Limited | Wholesale & retail | 2016 |
| CS Peat Building Contractors Limited | Construction | 2021 |
| CS Sports Promotions Ltd | Arts & recreation | 2025 |
| CSA Smart Repairs Ltd | Wholesale & retail | 2026 |
| CT Printers (UK) Ltd | Manufacturing | 2019 |