| C&A North Electrical Ltd | Construction | 2023 |
| C&C Paving & Fencing Supplies Limited | Manufacturing | 2021 |
| C&C Travel Ltd | Administrative & support | 2024 |
| C&D Welford Properties Limited | Real estate | 2020 |
| C&G Estates Limited | Real estate | 2016 |
| C&G Logistics Gold Limited | Transport & logistics | 2025 |
| C. Soar & Sons Holdings Limited | Water & waste | 2021 |
| C. Soar Property Holding Co Ltd | Real estate | 2021 |
| C. U. J. Limited | Wholesale & retail | 2004 |
| C.A.M Renovations & Plumbing Ltd | Construction | 2025 |
| C.G. Tolson Limited | Transport & logistics | 2005 |
| C.K. Beckett Transformers & Switchgear Limited | Manufacturing | 2012 |
| C.O.Geal Ltd | Construction | 2024 |
| C.P.M Angel INK Ltd | Arts & recreation | 2019 |
| C.S.P. Smile Limited | Health & social care | 2022 |
| C.Soar & Sons Limited | Construction | 1990 |
| C.T.M. (U.K.) Ltd. | Manufacturing | 1999 |
| C.T.M. Equipment Limited | Manufacturing | 2001 |
| C152 Aviation & Training Ltd | Other services | 2024 |
| C2C Commercial Investments Ltd | Real estate | 2017 |
| C2C Skills Ltd | Education | 2021 |
| CA Davies Engineering Limited | Professional & scientific | 2023 |
| Cabin & Modular Technology Ltd | Professional & scientific | 2024 |
| CAD Traders Wholesale Limited | Wholesale & retail | 2025 |
| Cadcamics Limited | Manufacturing | 2018 |
| CAE (Peterborough) Limited | Financial services | 2017 |
| Caelora Ltd | Wholesale & retail | 2025 |
| Cafe VIE Ltd | Hospitality | 2022 |
| Caffmos Limited | Administrative & support | 2011 |
| CAI Consultancy & Property Services Limited | Real estate | 2018 |
| Cairnsmore Limited | Professional & scientific | 2018 |
| Calabria Pizza Limited | Hospitality | 2023 |
| Caldans Limited | Professional & scientific | 2014 |
| Calder Electrical Services Ltd | Construction | 2020 |
| Calder Security Limited | Administrative & support | 2003 |
| Calidad Services Limited | Administrative & support | 2010 |
| Calidad Holdings Limited | Financial services | 2015 |
| Callum Engineering Ltd | Construction | 2004 |
| Calmit Ltd | Transport & logistics | 2018 |
| Camel Europe Ltd | Wholesale & retail | 2014 |
| Cameron Alexander Accountants Limited | Professional & scientific | 2008 |
| Cameron Alexander Limited | Professional & scientific | 2010 |
| Camm Services Ltd | Construction | 2022 |
| Campagna Properties Limited | Professional & scientific | 2003 |
| Candeo Commercial Limited | Construction | 2020 |
| Candeo Materials Limited | Manufacturing | 2013 |
| Candeo Wedding Carriages Limited | Administrative & support | 2018 |
| Cannex Limited | Manufacturing | 2016 |
| Cannon Hall Farm Limited | Agriculture & fishing | 2003 |
| Canvas & Corsages Limited | Wholesale & retail | 2025 |
| Capacity Care Consulting Limited | Health & social care | 2014 |
| Cape Site Services Limited | Mining & quarrying | 1995 |
| Capella Fashion Consulting Ltd | Wholesale & retail | 2019 |
| Capital Energy Ltd | Construction | 2018 |
| Capital Energy Property Ltd | Real estate | 2025 |
| Capitol Clinic Limited | Health & social care | 2009 |
| Capitol Door Solutions Ltd | Manufacturing | 2014 |
| Capricorn Electrical Solutions Ltd | Construction | 2022 |
| Capstone Digital Ltd | Information & communication | 2024 |
| Car Classic's & Storage Limited | Extraterritorial | 2020 |
| Car Credit NOW Ltd | Wholesale & retail | 2025 |
| Car M8 Ltd | Wholesale & retail | 2024 |
| Car Seekers Select Limited | Wholesale & retail | 2024 |
| Car Smart (Bodyshop) Limited | Wholesale & retail | 2023 |
| Carbide Industries Limited | Wholesale & retail | 2002 |
| Carbon Solutions Oven Cleaners Ltd | Administrative & support | 2025 |
| Carcom Ltd | Wholesale & retail | 2016 |
| Cardean Steam Railway Holdings Limited | Financial services | 2026 |
| Care Shop Limited | Wholesale & retail | 2018 |
| Carebeldi Limited | Construction | 1994 |
| Carekitchen Ltd | Hospitality | 2025 |
| Cares Laboratory Limited | Manufacturing | 2016 |
| Carfix-Uk Ltd | Wholesale & retail | 2026 |
| Cargo Builders Ltd | Transport & logistics | 2025 |
| Carham Limited | Real estate | 2017 |
| Caring Bird Consultancy Ltd | Administrative & support | 2019 |
| Caring Stars Limited | Health & social care | 2019 |
| Carisbrook Court RTM Company Limited | Households | 2016 |
| Carl IAN Williams Ltd | Other services | 2015 |
| Carlton Carriers Limited | Transport & logistics | 2007 |
| Carlton Motor Sport Limited | Manufacturing | 2014 |
| Carlton Roofing & Building Ltd | Construction | 2021 |
| Carlton Tuning Limited | Other services | 2021 |
| Carney Construction Limited | Construction | 2002 |
| Carpet Centre (Barnsley) Limited | Real estate | 2015 |
| Carr Properties (Yorkshire) Limited | Real estate | 2017 |
| Carrington Construction (Northern) Limited | Construction | 2015 |
| Carseekers Limited | Wholesale & retail | 2020 |
| Carter J & Co Ltd | Hospitality | 2026 |
| Cartmell Estates Limited | Real estate | 2020 |
| Cartmell Properties Limited | Real estate | 2019 |
| Cartwright & Co Limited | Professional & scientific | 1997 |
| Casa Brickwork Ltd | Construction | 2022 |
| Casavigo Ltd | Hospitality | 2023 |
| Casavigo Mapplewell Limited | Hospitality | 2025 |
| Cascie Consultants Limited | Other services | 2016 |
| Casemate UK Limited | Information & communication | 2007 |
| Cashelard Capital Limited | Financial services | 2011 |
| Casting Solutions Limited | Professional & scientific | 2004 |
| Castle Hill Training Limited | Education | 2013 |