| C & C Property (Yorkshire) Limited | Real estate | 2024 |
| C & G Inns (Cask) Ltd | Hospitality | 2018 |
| C & G Inns (Lamberts) Ltd | Professional & scientific | 2020 |
| C & G Inns (Stump Cross) Ltd | Hospitality | 2021 |
| C & H Textile Menders Limited | Manufacturing | 2016 |
| C & J (Huddersfield) Limited | Hospitality | 2026 |
| C & K Careers Ltd | Education | 1995 |
| C & M Hall Limited | Energy | 2005 |
| C & W Developments Limited | Real estate | 2005 |
| C Atkinson Contractors Ltd | Construction | 2015 |
| C Booth & SON Ltd | Wholesale & retail | 2024 |
| C G Flooring Systems Limited | Construction | 2000 |
| C H Events Limited | Hospitality | 2015 |
| C J Metcalf Property Limited | Real estate | 2021 |
| C M Electrical (Northern) Ltd | Construction | 2023 |
| C N S Management Services Ltd | Construction | 2006 |
| C P Group of Companies Limited | Professional & scientific | 2004 |
| C T L Supplies Limited | Wholesale & retail | 1995 |
| C T Systems (UK) Limited | Manufacturing | 1995 |
| C Walters Plumbing & Heating Limited | Construction | 2013 |
| C Worswick Consultancy Ltd | Hospitality | 2023 |
| C&D Retail Enterprise Limited | Wholesale & retail | 2025 |
| C&J Antich Ltd | Manufacturing | 2010 |
| C&J Murphy Ltd | Financial services | 2022 |
| C&M Cowan Ltd | Financial services | 2023 |
| C&P (FC100) Limited | Financial services | 2024 |
| C&P Special Situations LLP | | 2023 |
| C-S Khan Properties Limited | Real estate | 2022 |
| C. Connelly Ltd | Construction | 2009 |
| C.Carruthers Limited | Wholesale & retail | 1959 |
| C.F. Taylor & Co. Limited | Professional & scientific | 1916 |
| C.J. Stern (Oils) Limited | Wholesale & retail | 1977 |
| C.J.W. Printers Limited | Manufacturing | 1982 |
| C.M.D Logistics Ltd | Administrative & support | 2019 |
| C.T.A. Accountants Limited | Professional & scientific | 2002 |
| C12 Ltd | Construction | 2013 |
| C4PD Limited | Real estate | 2019 |
| C4RMA Ltd | Wholesale & retail | 2026 |
| C6-TECH Ltd | Manufacturing | 2021 |
| CAB Booking Ltd | Transport & logistics | 2026 |
| Cableco Romans (Cable Contractors) Limited | Construction | 2010 |
| Cache Studio Ltd | Wholesale & retail | 2023 |
| Cactus Print Ltd | Wholesale & retail | 2024 |
| Cadey Ltd | Other services | 2009 |
| Cadmunkey Limited | Professional & scientific | 2007 |
| CADVIS3D Limited | Professional & scientific | 2015 |
| CAF Capital Limited | Financial services | 2021 |
| Cafe DE Paris Group Ltd | Manufacturing | 2026 |
| Cafe Life Ltd | Hospitality | 2025 |
| Cafe Westy Limited | Hospitality | 2024 |
| Caffe Dolce Vita Ltd | Hospitality | 2026 |
| Caffe Venecia Ltd | Hospitality | 2013 |
| Café Mortel Limited | Wholesale & retail | 2021 |
| Cahill Properties Limited | Real estate | 2022 |
| Cake Bakery Ltd | Manufacturing | 2017 |
| Cakecharger Ltd | Information & communication | 2025 |
| Calcutta's Ltd | Information & communication | 2022 |
| Caldearne Developments Limited | Construction | 2016 |
| Calder Lifting Services Limited | Manufacturing | 1985 |
| Calderdale and Huddersfield Solutions Ltd | Administrative & support | 2018 |
| Calderdale and Kirklees Careers Limited | Education | 2020 |
| Calderdale Car Company Limited | Wholesale & retail | 1974 |
| Calderdale Community Stadium Limited | Arts & recreation | 2025 |
| Calderdale GAS Training Limited | Education | 2017 |
| Calderdale Holdings Limited | Wholesale & retail | 2005 |
| Calf HEY Design Limited | Manufacturing | 1993 |
| Calf HEY Holdings Limited | Financial services | 1996 |
| Calf HEY Labels Limited | Financial services | 2021 |
| Calf HEY Rotary Limited | Manufacturing | 1995 |
| Calibre Cleaning & Hygiene Supplies Ltd | Wholesale & retail | 2013 |
| Calin Limited | Manufacturing | 2006 |
| Calldave Limited | Wholesale & retail | 2024 |
| Callista Incorporated Ltd | Manufacturing | 2020 |
| Callisto Freight Ltd | Transport & logistics | 2022 |
| Cally Limited | Wholesale & retail | 2022 |
| Calm Financial Management Limited | Professional & scientific | 2008 |
| Calm Nutrition Ltd | Wholesale & retail | 2026 |
| Calma Virtual Assistant Services Ltd. | Administrative & support | 2025 |
| Calvert & Clapham (1801) Limited | Manufacturing | 1998 |
| Cambrai Properties Ltd | Real estate | 2020 |
| Cambridge Hotel and Lodge Limited | Hospitality | 2003 |
| Cambridge Hotel Real Estate Limited | Construction | 2022 |
| Cambridge Station Road Education Co. Ltd | Professional & scientific | 2021 |
| Cameo Building Ltd | Construction | 2025 |
| Cameraderie Ltd | Information & communication | 2011 |
| Cameron Graham Limited | Manufacturing | 2004 |
| Camguard Ltd | Administrative & support | 2026 |
| Camou Chameleon Ltd | Arts & recreation | 2025 |
| Campbell Jensen Music Ltd | Arts & recreation | 2023 |
| Campus Next Top Model Ltd | Professional & scientific | 2026 |
| Cams Cuts Ltd | Other services | 2023 |
| Cams Property Lets Ltd | Real estate | 2025 |
| Canal View Management Company Limited | Households | 2018 |
| Cancer Care for Pets Limited | Professional & scientific | 2021 |
| Candesic Ltd | Professional & scientific | 2018 |
| Candii Bath Limited | Wholesale & retail | 2015 |
| Candour Properties Investments II Limited | Financial services | 2024 |
| Candour Properties Investments III Limited | Financial services | 2024 |
| Candour Properties Investments Limited | Real estate | 2023 |
| Candour Properties Limited | Real estate | 2021 |