| Cmplantservices Ltd | Mining & quarrying | 2023 |
| Coastal Park Homes Limited | Construction | 2019 |
| Code Ignite Ltd | Information & communication | 2020 |
| Colbet Designs Limited | Manufacturing | 1989 |
| Cold PAW Ltd | Transport & logistics | 2024 |
| Colins Agri Limited | Agriculture & fishing | 2025 |
| Collen R Limited | Health & social care | 2021 |
| Colourworks (UK) Ltd | Construction | 2018 |
| Colourworks Fire & Intumescent Coatings Limited | Construction | 2024 |
| Colton Homes Ltd | Construction | 2025 |
| Colton Roofing and Construction Ltd | Construction | 2016 |
| Colton Services Limited | Financial services | 2020 |
| COM - PAK Design Limited | Manufacturing | 1987 |
| Comery Capital Ltd | Households | 2025 |
| Comet S&C Ltd | Arts & recreation | 2021 |
| Commercial & Domestic Property Solutions Ltd | Construction | 2014 |
| Commercial Evict Ltd | Administrative & support | 2019 |
| Community Care Systems Limited | Professional & scientific | 2003 |
| Comparity Limited | Construction | 1996 |
| Complete Civils & Construction Ltd | Construction | 2024 |
| Composilite Ltd | Professional & scientific | 2023 |
| Comprehend Solutions Limited | Information & communication | 2013 |
| Concept Accommodation Limited | Construction | 1999 |
| Concession Stores Ltd | Wholesale & retail | 2023 |
| Concretemade Ltd | Manufacturing | 2020 |
| Connelly Investments Ltd | Construction | 2018 |
| Consid Group Ltd | Wholesale & retail | 2025 |
| Consult Industries Limited | Professional & scientific | 2019 |
| Consumer Messaging Solutions Limited | Manufacturing | 2023 |
| Context Global Consulting Limited | Other services | 2020 |
| Cooper and Cooper Capital Limited | Financial services | 2026 |
| Corfu Tourist Limited | Other services | 2018 |
| Cornelya's Food Ltd | Other services | 2018 |
| Cornerstone Distribution Limited | Wholesale & retail | 2004 |
| Cotgreave Natural Equestrian Ltd | Education | 2018 |
| Cotmanhay Community Network Foundation | Administrative & support | 2026 |
| Cotmanhay Community Network Ltd | Administrative & support | 2025 |
| Cotmanhay Farm Stores Ltd | Wholesale & retail | 2020 |
| Cottage Garden Foods Limited | Manufacturing | 2008 |
| Countrywide Midlands Limited | Administrative & support | 1997 |
| Covet-Me Ltd | Information & communication | 2021 |
| COX Financial Services Limited | Financial services | 2018 |
| Cozyzone Ltd | Construction | 2024 |
| CP Builders Limited | Construction | 2003 |
| CP Online Services Limited | Professional & scientific | 2024 |
| CPA & Associates Ltd | Real estate | 2017 |
| CPQ Components Ltd | Wholesale & retail | 2025 |
| Crafted Retail Ltd | Construction | 2026 |
| Craftglaze Bespoke Window and Door Solutions Ltd | Construction | 2020 |
| Craner & Kirkman Ltd | Wholesale & retail | 2022 |
| Crate Properties Ltd | Real estate | 2018 |
| Crazy Candy Land Ltd | Wholesale & retail | 2026 |
| Creative Wine Making Limited | Manufacturing | 2014 |
| Credenhill Limited | Wholesale & retail | 1955 |
| CRF Carpets Ltd | Construction | 2023 |
| CRM Education Ltd. | Education | 2013 |
| Croftdale Leather Company Limited | Manufacturing | 2003 |
| Crunchy Critters Limited | Hospitality | 2013 |
| Crystal Environmental Services Ltd | Water & waste | 2006 |
| CS Samples Holdings Limited | Construction | 2008 |
| CS Windows Doors & Conservatories Ltd | Construction | 2019 |
| CSR Construct Limited | Construction | 2001 |
| CTJ Consulting Limited | Administrative & support | 2004 |
| Ctnk Ltd | Construction | 2024 |
| CTR Commercial Roofing Ltd | Construction | 2025 |
| Custom Group Hold Co Limited | Professional & scientific | 2010 |
| Custom Theatre Services Limited | Extraterritorial | 1993 |
| Customfit Joinery Limited | Construction | 2017 |
| Customize HQ Limited | Wholesale & retail | 2023 |
| Cuthub Limited | Hospitality | 2023 |
| CW Smart Repairs Limited | Wholesale & retail | 2006 |
| CWG Properties Ltd | Real estate | 2026 |
| Cwpms Limited | Professional & scientific | 2014 |
| Cwtch 45 Ltd | Hospitality | 2025 |
| Cycle Inn (Nottingham) Ltd | Wholesale & retail | 2024 |
| D & D Catenary Engineers Limited | Professional & scientific | 2023 |
| D & J Wint Limited | Construction | 2010 |
| D B Builders (UK) Limited | Construction | 2002 |
| D Bytham Limited | Administrative & support | 2007 |
| D Harris Family Butchers Ltd | Wholesale & retail | 2023 |
| D L Plastics Limited | Manufacturing | 2016 |
| D Locksmith Ltd | Administrative & support | 2026 |
| D S Garage Services Limited | Wholesale & retail | 2008 |
| D Schofield Interiors Ltd | Construction | 2023 |
| D Snaith Building Contractor Ltd | Construction | 2022 |
| D&C Investments Ltd | Real estate | 2022 |
| D.&.D Security (Midlands) Limited | Administrative & support | 2008 |
| D.A.B Decorating Limited | Construction | 2026 |
| D.A.B. Plastering Ltd | Construction | 2026 |
| D.A.D. Decorating Limited | Construction | 2026 |
| Dakin & Co Accountancy Services Limited | Professional & scientific | 2012 |
| Dames Mode Ltd | Wholesale & retail | 2026 |
| Damon Thorley Limited | Information & communication | 2026 |
| DAN Hamson Financial Services Limited | Financial services | 2022 |
| Dancal Electrical Ltd | Construction | 2014 |
| Danny Fantom Racing Ltd | Arts & recreation | 2020 |
| Darrowby Veterinary Services Limited | Professional & scientific | 2013 |
| Datasecure Technologies Ltd | Information & communication | 2026 |
| David Cufflin Limited | Professional & scientific | 2005 |
| David Newham Plumbing & Heating Limited | Construction | 2007 |