| Cobra Consulting Limited | Information & communication | 1996 |
| Coco and Dunning Ltd | Other services | 2024 |
| Codegrey Limited | Information & communication | 2014 |
| Coffee Club Yorkshire Ltd | Hospitality | 2025 |
| Coffee Creations Scarborough Ltd | Hospitality | 2024 |
| Cold UP North Ltd | Financial services | 2023 |
| Coldyhill Hollow Ltd | Arts & recreation | 2025 |
| Colin Ellis Property Services Ltd | Real estate | 2020 |
| Colin Hale ADR Ltd | Professional & scientific | 2013 |
| Collaborate Properties Ltd | Real estate | 2020 |
| Columbus Ravine Management Limited | Households | 2009 |
| Combe HAY Limited | Extraterritorial | 2024 |
| Comber (Bay) Limited | Hospitality | 2020 |
| Comfy Care Homes Limited | Health & social care | 2004 |
| Comgas Heating Ltd | Construction | 2014 |
| Commercial Pipework Solutions Ltd | Energy | 2017 |
| Community Holdings Ltd | Financial services | 2022 |
| Community TM Limited | Administrative & support | 2012 |
| Compass Entertainment Ltd | Arts & recreation | 2004 |
| Competitions North East Limited | Wholesale & retail | 2024 |
| Complete Care Homes Limited | Health & social care | 2001 |
| Completus Group Ltd | Financial services | 2025 |
| Completus Property Ltd | Extraterritorial | 2025 |
| Concept Construction (Scarborough) Limited | Real estate | 1989 |
| Concept Development Yorkshire Limited | Construction | 2022 |
| Connect (North Yorkshire) Limited | Public administration | 2018 |
| Connected Scarborough CIC | Education | 2025 |
| Connexions Transport Planning Consultancy Limited | Professional & scientific | 2009 |
| Conscious Connected Creating CIC | Education | 2026 |
| Consolidated Refinish Supplies Ltd | Wholesale & retail | 2004 |
| CONSTRUCT74 Ltd | Construction | 2023 |
| Construction Design Engineers Ltd | Professional & scientific | 2023 |
| Consumer Core Limited | Hospitality | 2026 |
| Consumer Retail Ltd | Wholesale & retail | 2012 |
| Contract Cleaning Limited | Administrative & support | 2017 |
| Control and Power Systems Limited | Manufacturing | 1994 |
| Conudra Ltd | Households | 2019 |
| Cookland Ltd | Information & communication | 2026 |
| Cool Cell Limited | Wholesale & retail | 2009 |
| Coolman Barbers Ltd | Other services | 2020 |
| Coopland Holdings Limited | Financial services | 2025 |
| Coppergate Kennels Limited | Other services | 2006 |
| Corellian Group Ltd | Real estate | 2023 |
| Corner Fish Bar Ltd | Hospitality | 2024 |
| Corona Office Equipment Limited | | 1980 |
| Corrigan Leisure Limited | Construction | 1973 |
| Cosy Cottage Retail Malton Limited | Wholesale & retail | 2020 |
| Cosy Cottage Soap Limited | Manufacturing | 2017 |
| Coulson Investments Ltd | Real estate | 1991 |
| Coutts Bradley Trading Ltd | Wholesale & retail | 2026 |
| Couture Boutique Ltd | Wholesale & retail | 2025 |
| Covaro Ltd | Professional & scientific | 2021 |
| Coverroo Ltd | Manufacturing | 2018 |
| Cowen Surveyors Limited | Professional & scientific | 2025 |
| Coywood Limited | Wholesale & retail | 2003 |
| CP Edupsychservices Ltd | Education | 2026 |
| CP Properties (Scarborough) Ltd | Real estate | 2020 |
| CPH Estate Agents Ltd | Real estate | 2015 |
| CPK Investments Limited | Administrative & support | 2010 |
| CPS Energy Limited | Administrative & support | 2010 |
| CPW Mobile Vehicle Maintenance & Repairs Ltd | Wholesale & retail | 2022 |
| CQQ (Yorkshire) Limited | Professional & scientific | 2013 |
| Crab Lane Shellfish Limited | Financial services | 2019 |
| Cragg Projects Limited | Hospitality | 2012 |
| Craggs Construction Limited | Construction | 2016 |
| Craig Large Construction Limited | Construction | 2023 |
| Cranbrook Management Company Limited | Households | 1988 |
| Craven Garth Ltd | Agriculture & fishing | 2024 |
| Crazy Combat Limited | Arts & recreation | 2008 |
| CRB Services (North) Ltd | Construction | 2025 |
| Create Arts Development Ltd | Arts & recreation | 2007 |
| Creating Solutions Limited | Construction | 2018 |
| Creating Unique Beginnings Ltd | Hospitality | 2023 |
| Creative Brickwork Company Ltd | Construction | 2015 |
| Creative Timelines Ltd | Information & communication | 2024 |
| Cred Limited | Professional & scientific | 2006 |
| Crema E Cioccolato Ltd | Hospitality | 2024 |
| Crescent View Management (Scarborough) Limited | Households | 2005 |
| Crofts Chocolates Ltd | Manufacturing | 2013 |
| Crosier Limited | Construction | 2014 |
| Crossgate Stores Ltd | Wholesale & retail | 2025 |
| Crossgates Consultancy Limited | Education | 2025 |
| Crossgates Plumbing Limited | Construction | 2026 |
| Crow Recruitment Ltd | Administrative & support | 2015 |
| Crown Contracting (Yorkshire) Ltd | Construction | 2017 |
| Crown Glass & Glazing Limited | Construction | 2003 |
| Crown Properties (Scarborough) Group Limited | Financial services | 2021 |
| Crown Properties (Scarborough) Limited | Real estate | 1999 |
| Crown Renovations Limited | Construction | 2006 |
| Crown Surfacing Ltd | Extraterritorial | 2017 |
| Crown Valeting Ltd | Wholesale & retail | 2023 |
| CRP (Whitby) Limited | Extraterritorial | 2012 |
| CRS Cladding & Roofing Solutions Limited | Construction | 2022 |
| Crystal Clear Cleaning Services (Scarborough) Ltd | Administrative & support | 2025 |
| CS Food Group Limited | Financial services | 2017 |
| CS Properties Scarborough Ltd | Real estate | 2024 |
| CS Property Solutions Ltd | Construction | 2018 |
| Ctrl-Ware Limited | Information & communication | 2006 |
| CTS Building Contractors Ltd | Construction | 2019 |
| Cumbria Cleaning Services Ltd | Administrative & support | 2026 |