| Calvo Consulting & Investments Limited | Professional & scientific | 2023 |
| Canal Garage (Boroughbridge) Limited | Wholesale & retail | 2003 |
| CAP International Services Limited | Health & social care | 2009 |
| Capital Electrical UK & Ireland Ltd. | Construction | 2018 |
| Cappkind Limited | Professional & scientific | 2015 |
| Car Buyers Direct Ltd | Wholesale & retail | 2025 |
| Caravel Foods (UK) Ltd | Wholesale & retail | 2023 |
| Carbonbrokers Limited | Professional & scientific | 2007 |
| Careround Limited | Professional & scientific | 2024 |
| Cargo Logistics Holdings Ltd | Financial services | 2024 |
| Cargo Logistics UK Limited | Transport & logistics | 2001 |
| CARS2GOOD2TRADE Limited | Extraterritorial | 2014 |
| Carters Bespoke Contracts Ltd | Construction | 2026 |
| Carters Interiors Ltd | Construction | 2021 |
| Casa Inspired Living Limited | Real estate | 2023 |
| Case Clean & Sweep Limited | Administrative & support | 2022 |
| Casson Care Services Ltd. | Health & social care | 2021 |
| Castle Clinic (Knaresborough) Limited | Health & social care | 2022 |
| Castle Kitchens Limited | Wholesale & retail | 2026 |
| Castle Mills Management Company Limited | Households | 1987 |
| Castlegate Cutz Ltd | Other services | 2025 |
| Catw Limited | Professional & scientific | 2023 |
| CBB Group Ltd. | Manufacturing | 2018 |
| CC Pharmtech Solutions Ltd | Health & social care | 2024 |
| Celtic Roots Limited | Wholesale & retail | 1996 |
| Cenheard Limited | Information & communication | 2019 |
| Centient Limited | Professional & scientific | 2021 |
| CG and MP Holdings Ltd | Wholesale & retail | 2021 |
| CG Auto Refinishing Limited | Wholesale & retail | 2016 |
| CH & MH Properties Ltd | Real estate | 2023 |
| CH Consultants Limited | Information & communication | 2007 |
| CH Restorations Ltd | Construction | 2020 |
| Chain Lane Community Hub | Real estate | 2011 |
| Champion Prints Ltd | Wholesale & retail | 2022 |
| Charles Lumb & Sons,Limited | Wholesale & retail | 1936 |
| Charlotte Armitage Limited | Other services | 2021 |
| Charlotte Armitage Properties Limited | Real estate | 2024 |
| Charlton Manor (Management) Ltd | Households | 2015 |
| Cheekbone Limited | Information & communication | 2022 |
| Chestnut Invest Ltd | Financial services | 2025 |
| Chestnut Realtor Ltd | Construction | 2025 |
| Chestnut Risk Ltd | Professional & scientific | 2025 |
| Cholms Properties Limited | Real estate | 2018 |
| CHQ Ltd | Construction | 2020 |
| Chris Holmes Antiques Ltd | Professional & scientific | 2019 |
| Chris Holmes Art Ltd | Other services | 2016 |
| Chris Pedley Limited | Professional & scientific | 2003 |
| Christians Cafe Bar Limited | Hospitality | 2014 |
| Church Lane Studios Ltd | Information & communication | 2021 |
| Church Mews (Knaresborough) Ltd | Hospitality | 2015 |
| Church View (Sherburn) Limited | Households | 2003 |
| CK Home Improvement Solutions Ltd | Construction | 2026 |
| Clad Safety Limited | Wholesale & retail | 2014 |
| Clarity Audio Visual Solutions Limited | Arts & recreation | 2018 |
| Claro Consulting Ltd | Information & communication | 2020 |
| Claro Court (Knaresborough) Management Company Limited | Households | 2020 |
| Claro Court Management Company Limited | Real estate | 1987 |
| Claro Precision Engineering Limited | Manufacturing | 2024 |
| Clay Consultants Limited | Mining & quarrying | 2005 |
| Cleaves Gardens Management Ltd | Real estate | 2024 |
| Cleverass Holdings Limited | Construction | 2021 |
| CMB Digital Consulting Ltd | Professional & scientific | 2024 |
| Code Radical Limited | Construction | 2018 |
| Colto Living Limited | Wholesale & retail | 2024 |
| Community Stars Community Interest Company | Other services | 2020 |
| Compacs.Ai Ltd | Professional & scientific | 2024 |
| Company Colours Limited | Extraterritorial | 2002 |
| Complete Service Group Limited | Administrative & support | 2024 |
| Compliance College Ltd | Extraterritorial | 2020 |
| Conker Hire Limited | Administrative & support | 2025 |
| Conker Landscapes Limited | Administrative & support | 2011 |
| Connect UP Solutions Ltd | Information & communication | 2020 |
| Conner Roofing Contractors Ltd | Construction | 2019 |
| Control Point Consulting Ltd | Professional & scientific | 2015 |
| Corinne Hide Limited | Wholesale & retail | 2008 |
| Corinthian Brands (CBL) Limited | Wholesale & retail | 2010 |
| Cornercroft Investments Limited | Financial services | 2019 |
| Corporate Colours Limited | Extraterritorial | 1981 |
| Cortexa Advisory Ltd | Wholesale & retail | 2026 |
| Coster Wilson Ltd | Administrative & support | 2025 |
| Cotenx Limited | Professional & scientific | 2023 |
| Countdown Radio Limited | Information & communication | 2009 |
| Courtyard Barbers Knaresborough Ltd | Other services | 2021 |
| CPY Business Solutions Ltd | Professional & scientific | 2018 |
| Craft and Social Limited | Education | 2004 |
| Cramberry Ltd | Information & communication | 2019 |
| Crazy Cotton Ltd | Transport & logistics | 2025 |
| Create Letting and Sales Ltd | Real estate | 2024 |
| Creskeld Design Ltd | Professional & scientific | 2021 |
| Crickhedge Estates Limited | Real estate | 1991 |
| Crickhedge Limited | Real estate | 1981 |
| Crossgates Osteopathic Practice Ltd | Health & social care | 2002 |
| Crucible Consulting Limited | Professional & scientific | 2025 |
| Cruet Farm Investments Limited | Real estate | 2015 |
| Cryer Baker Executive Search Ltd | Administrative & support | 2012 |
| CSG Goulden Property Ltd | Real estate | 2022 |
| Curiosity Junction Limited | Information & communication | 2024 |
| Currant Games Ltd | Information & communication | 2025 |
| Custom Contracting | | 1993 |
| CUT & Go (Knaresbrough) Ltd | Other services | 2025 |