| Calder Grove Developments Limited | Construction | 2022 |
| Calder Oils Limited | Manufacturing | 1957 |
| Calder Park Limited | Wholesale & retail | 2019 |
| Calder Windows Limited | Construction | 2007 |
| Calderland Developments Limited | Construction | 2020 |
| Caleb Properties and Management Ltd | Real estate | 2026 |
| Caledon Cover Limited | Financial services | 2023 |
| Caledon Holdings Limited | Financial services | 2023 |
| Calixo Limited | Wholesale & retail | 2020 |
| Callaworth Investments Limited | Real estate | 2025 |
| Callear Trading Ltd | Wholesale & retail | 2026 |
| Calls Investment Ltd | Real estate | 2025 |
| Calverley Studios Ltd | Hospitality | 2024 |
| Cambridge Green Ltd | Construction | 2017 |
| Cameo Ashford Ltd | Hospitality | 2024 |
| Cameron Stephens Limited | Wholesale & retail | 2021 |
| Campfire Care Ltd | Health & social care | 2025 |
| Candy Hospitality Limited | Hospitality | 2026 |
| Cantidad Holdings Limited | Financial services | 2024 |
| Cantidad Limited | Professional & scientific | 2022 |
| Cantiere Limited | Professional & scientific | 2015 |
| Capanza Ltd | Transport & logistics | 2017 |
| Caphouse Limited | Professional & scientific | 2016 |
| Capital Construction North East Limited | Construction | 2025 |
| Capitanos Limited | Construction | 2014 |
| Cappios Ltd | Hospitality | 2025 |
| Capri @ the Containers Ltd | Hospitality | 2021 |
| Capri @ Vine Ltd | Hospitality | 2025 |
| Capri a I Ltd | Financial services | 2026 |
| Captain's Club Beer Limited | Wholesale & retail | 2025 |
| Car and Trailer Ltd. | Other services | 2006 |
| Caragana Limited | Wholesale & retail | 2016 |
| Carbon Black Automotive Ltd | Wholesale & retail | 2023 |
| Carbon Intensity Ltd | Professional & scientific | 2024 |
| Carbulbs Ltd | Extraterritorial | 2014 |
| Card Factory Foundation | Health & social care | 2018 |
| Card Factory PLC | Wholesale & retail | 2014 |
| Card Forge TCG Ltd | Wholesale & retail | 2024 |
| Cardissz Logistics Limited | Transport & logistics | 2025 |
| Care Facilities Administration Ltd | Administrative & support | 2023 |
| Care for Success Ltd | Administrative & support | 2021 |
| Care-Ability Healthcare Limited | Manufacturing | 2011 |
| Care-Ability Holdings Limited | Financial services | 2019 |
| Career Services CIC | Education | 2016 |
| Career Skills Training Limited | Administrative & support | 2011 |
| Careerbay C.I.C. | Professional & scientific | 2019 |
| Careercove Limited | Professional & scientific | 2025 |
| Carely Healthcare Ltd | Health & social care | 2023 |
| Caremo Services Limited | Administrative & support | 2025 |
| Carey Bespoke Ltd | Construction | 2023 |
| Caribsafe Ltd | Information & communication | 2026 |
| Carl In-Wood Company Ltd | Manufacturing | 2020 |
| Carl's Car Company Ltd | Wholesale & retail | 2024 |
| Carla and Chris’S Happy Pets Ltd | Households | 2019 |
| Carlos-Trans Ltd | Transport & logistics | 2019 |
| Carlton Support Group Limited | Administrative & support | 2018 |
| Carlyle BUS & Coach Limited | Professional & scientific | 2005 |
| Carm Consultancy Limited | Professional & scientific | 2015 |
| Carmody Infrastructure Ltd | Construction | 2026 |
| Carnam Construction Limited | Construction | 1990 |
| Carney Properties Limited | Real estate | 2025 |
| Carousel Cabins Ltd | Administrative & support | 2026 |
| Carousel Coin Leisure Limited | Arts & recreation | 2023 |
| Carousel Estates Limited | Construction | 2020 |
| Carousel Holdings Limited | Construction | 2019 |
| Carousel Property Developments Ltd | Real estate | 2024 |
| Carpet Bagger Limited | Construction | 2017 |
| Carr Street Developments Ltd | Real estate | 2018 |
| Carr View Hall Limited | Households | 2011 |
| Carrera Business Solutions Limited | Information & communication | 2017 |
| Cars 2 Limited | Wholesale & retail | 2006 |
| Carter & Co Canine Care Ltd | Other services | 2025 |
| Carter Stoves & Fireplaces Ltd | Construction | 2021 |
| Cartlynest Ltd | Wholesale & retail | 2026 |
| CAS Cars Ltd | Transport & logistics | 2019 |
| CAS Construction Services Limited | Professional & scientific | 2018 |
| CAS Styling Limited | Other services | 2025 |
| Casa Grill Ltd | Hospitality | 2025 |
| Casa MIA Interior Design Limited | Wholesale & retail | 2012 |
| Casa Property Group Ltd | Construction | 2019 |
| Casdami Ltd | Wholesale & retail | 2026 |
| Cass Property & Investments Limited | Real estate | 2018 |
| Cast Iron Games Limited | Administrative & support | 2024 |
| Castle Asset Management Limited | Real estate | 2020 |
| Castle Cafe (Wakefield) Limited | Hospitality | 2019 |
| Castle Communication Services (Yorkshire) Ltd | Other services | 2021 |
| Castle Lettings Limited | Real estate | 2026 |
| Castle Padel Ltd | Arts & recreation | 2026 |
| Castle Properties (Northern) Limited | Real estate | 2004 |
| Castle Road (Wakefield) Management Limited | Households | 2007 |
| Castleflex Limited | | 1990 |
| Castleford Estate Ltd | Real estate | 2024 |
| Castleford Road OFF Licence Limited | Wholesale & retail | 2006 |
| Castlegate Stores Limited | Wholesale & retail | 2003 |
| Castlegates View | Administrative & support | 2010 |
| Castos Properties Ltd | Real estate | 2025 |
| Castos Ventures Ltd | Real estate | 2023 |
| Castrop Bond Limited | Professional & scientific | 2018 |
| Caswood Limited | Manufacturing | 1995 |
| Catalin Craciun Ltd | Transport & logistics | 2025 |