| Clockwork Carers Ltd | Health & social care | 2023 |
| Clogworks Services Limited | Wholesale & retail | 2017 |
| Close to Nature Playcafe Ltd | Hospitality | 2026 |
| Closifyz Ltd | Wholesale & retail | 2024 |
| Cloud 9 Beds Limited | Manufacturing | 2020 |
| Cloud Consultech Ltd | Administrative & support | 2020 |
| Cloud Kenato Ltd | Information & communication | 2023 |
| Cloud Nine Stays Ltd | Hospitality | 2024 |
| Cloudchain Consulting Ltd | Information & communication | 2021 |
| Cloudmig Limited | Information & communication | 2025 |
| Cloudscape Resources Ltd | Information & communication | 2013 |
| Cloudstream Solutions Ltd | Information & communication | 2018 |
| Cloudtech Associates Limited | Administrative & support | 2022 |
| Clough LEE Management Company Limited | Real estate | 2002 |
| Cloverleaf People Solutions Ltd | Professional & scientific | 2022 |
| CLP Trading Ltd | Wholesale & retail | 2020 |
| CLT Private Limited | Hospitality | 2020 |
| Club POP Ltd | Hospitality | 2025 |
| Cluck and Grill Ltd | Hospitality | 2024 |
| CLW ANP Services Ltd | Health & social care | 2023 |
| CM Football Consultancy Ltd | Arts & recreation | 2025 |
| CM LAU Limited | Manufacturing | 2005 |
| CM Law Properties Ltd | Real estate | 2016 |
| CM Smma Ltd | Information & communication | 2025 |
| Cmag International Limited | Financial services | 2020 |
| CMB23 Limited | Extraterritorial | 2023 |
| CMD Holdings (Yorkshire) Limited | Financial services | 2025 |
| CMI Services Limited | Professional & scientific | 2008 |
| Cmrr Distribution Ltd | Wholesale & retail | 2025 |
| Cmsurveys Limited | Professional & scientific | 2016 |
| CMT Property Limited | Real estate | 1998 |
| CMX Advisory Limited | Professional & scientific | 2025 |
| CNC Products Limited | Manufacturing | 2011 |
| CNC Spares and Repairs Limited | Manufacturing | 2019 |
| CNS Taverns Ltd | Hospitality | 2026 |
| CO4T5 Limited | Construction | 2019 |
| COA Limited | Financial services | 2016 |
| Coach House Healing Ltd | Other services | 2013 |
| Coach House Management Company (Marsden) Limited | Real estate | 2009 |
| Coach Travel Services Limited | Transport & logistics | 2006 |
| COACH2GO.CO.UK Limited | Transport & logistics | 2020 |
| Coachhouse Healing Holdings Limited | Financial services | 2019 |
| Coal IT Imports Ltd | Professional & scientific | 2025 |
| Coal Properties Limited | Real estate | 2026 |
| Cobalt Strategy Limited | Professional & scientific | 2023 |
| Cobbett Environmental Limited | Professional & scientific | 1995 |
| Cobbler & Sons Ltd | Real estate | 2024 |
| Cockcroft Joinery Ltd | Construction | 2015 |
| Cocking Property Ltd | Extraterritorial | 2023 |
| Cockley Wood Events Ltd | Administrative & support | 2023 |
| Coco and Crème Ltd | Hospitality | 2024 |
| Coco Holdings Huddersfield Limited | Financial services | 2025 |
| Coco North Ltd | Other services | 2005 |
| Cocoboo Candles Ltd | Wholesale & retail | 2020 |
| Coco’S Campers Ltd | Manufacturing | 2024 |
| Codaglow Limited | Real estate | 2019 |
| Code Blue Group Limited | Administrative & support | 2003 |
| Code Bricks Limited | Information & communication | 2024 |
| Code IVY Limited | Information & communication | 2023 |
| Codesmith Technology Ltd | Information & communication | 2017 |
| Codfather HD Ltd | Hospitality | 2021 |
| Codingdale Limited | Professional & scientific | 2014 |
| Cofam Holdings Ltd | Real estate | 2023 |
| Coffee Bean and Tea Leaf Ltd | Wholesale & retail | 2019 |
| Coffee CUP Huddersfield Ltd | Hospitality | 2024 |
| Coffee-Boy International Limited | Manufacturing | 2017 |
| Cognaisant Ltd | Information & communication | 2023 |
| Cognioso Limited | Extraterritorial | 2026 |
| Cogri Engineering Limited | Manufacturing | 2006 |
| Cogri Group Limited | Construction | 1989 |
| Cold Blow Lane Productions Ltd | Information & communication | 2017 |
| Coldkast Ltd | Wholesale & retail | 2025 |
| Coldtherm Limited | Manufacturing | 2014 |
| Coleman Cost Services Limited | Construction | 2023 |
| Coleman Woodwork Ltd | Construction | 2016 |
| Coleraine Business Park 1 Limited | Information & communication | 2017 |
| Colin Maguire Electrical Contractors Ltd | Construction | 2022 |
| Colin Peaker Ltd | Construction | 2018 |
| Collaborarti CIC | Education | 2024 |
| Collections of CIC | Information & communication | 2025 |
| College CAN DO CIC | Education | 2023 |
| Colleton Ltd | Real estate | 2023 |
| Colley GAS Services Ltd | Construction | 2026 |
| Collins Wright Limited | Manufacturing | 2008 |
| Colltex FOX Holdings Limited | Financial services | 2021 |
| Colltex Limited | Wholesale & retail | 2002 |
| Colman Bioscience Ltd | Professional & scientific | 2023 |
| Colne & Holme Ltd | Real estate | 2026 |
| Colne Vale Contractors Limited | Construction | 2012 |
| Colne Valley Accountancy Services Ltd | Professional & scientific | 2022 |
| Colne Valley Black Belt Academy LLP | | 2018 |
| Colne Valley Community Care Ltd | Health & social care | 2025 |
| Colne Valley Cosmetics Ltd | Other services | 2025 |
| Colne Valley Cycle Therapy CIC | Arts & recreation | 2020 |
| Colne Valley Fabrications Ltd | Administrative & support | 2020 |
| Colne Valley Motor Parts Limited | Wholesale & retail | 2017 |
| Colne Valley Property Services Ltd | Construction | 2009 |
| Colne Valley Self Storage Limited | Administrative & support | 2016 |
| Colne Valley Spinning Company Limited | Manufacturing | 1962 |
| Colo Consulting Education Limited | Professional & scientific | 2022 |