| City Bazarr Limited | Wholesale & retail | 2026 |
| City Gent Publications Limited | Information & communication | 1989 |
| City Transport & Storage Ltd | Transport & logistics | 2002 |
| City Valley Church | Other services | 2013 |
| CJB Music Limited | Arts & recreation | 2015 |
| Cjfj Properties Limited | Real estate | 2020 |
| Cladcoroofing Ltd | Construction | 2025 |
| Clark Engineering Limited | Professional & scientific | 1997 |
| Clark Investments 2025 Limited | Real estate | 2025 |
| Claw Culture Limited | Wholesale & retail | 2020 |
| Clear Choice Clean Ltd. | Administrative & support | 2021 |
| Clear Sight Window Cleaning Ltd | Administrative & support | 2025 |
| Clear Trend Associates Ltd | Professional & scientific | 2012 |
| Clearpath Paraplanning Ltd | Financial services | 2025 |
| Clearstones Services WK UK Limited | Administrative & support | 2025 |
| Clements & Co Accountants Ltd | Professional & scientific | 2024 |
| Cleverly Planned Limited | Financial services | 2019 |
| CLH Nutrition Limited | Wholesale & retail | 2025 |
| Clres Limited | Real estate | 2018 |
| Cluderay Property Holdings Ltd | Real estate | 2024 |
| CML Pubs Ltd | Professional & scientific | 2025 |
| CMS Construction Management Solutions Limited | Construction | 2010 |
| CMW Accountancy Limited | Professional & scientific | 2019 |
| CMW Taxation Services Limited | Professional & scientific | 2022 |
| Coach Multimedia Systems Limited | Wholesale & retail | 2015 |
| Coba Dog Walking Ltd | Other services | 2025 |
| Cobb & Jagger Limited | Wholesale & retail | 2003 |
| Cobin Contractors Limited | Construction | 2022 |
| Coco & Barley (Bingley) Ltd | Other services | 2025 |
| Coco & Barley Academy Ltd | Other services | 2023 |
| Coco & Barley Country Kitchen Limited | Wholesale & retail | 2022 |
| Coco & Carmelo Limited | Other services | 2024 |
| Coco and Barley Limited | Other services | 2019 |
| Coffee Village Limited | Wholesale & retail | 2017 |
| Collett EC Limited | Professional & scientific | 1998 |
| Collisons Limited | Manufacturing | 2005 |
| Collitt Gardens Ltd | Administrative & support | 2020 |
| Commercial & Business Funding Limited | Financial services | 2019 |
| Compass House Joinery Limited | Construction | 2025 |
| Compelling Excelling Limited | Administrative & support | 2015 |
| Complete Therapy Solutions Limited | Other services | 2020 |
| Comtech Security Systems Ltd | Administrative & support | 2021 |
| Concept Packaging Limited | Professional & scientific | 1993 |
| Concept Packaging Services Limited | Professional & scientific | 2006 |
| Concise Consulting Services Limited | Professional & scientific | 2016 |
| Concorde Electrical Services Limited | Construction | 2024 |
| CONFIG3PL Ltd | Transport & logistics | 2024 |
| Connekt Planning Ltd | Professional & scientific | 2023 |
| Connekt Property Ventures Ltd | Real estate | 2022 |
| Construction Housing Limited | Manufacturing | 2012 |
| Consult Red Holdings Limited | Professional & scientific | 2003 |
| Consult Red Limited | Information & communication | 2008 |
| CONSULTATECI442 Ltd | Professional & scientific | 2024 |
| Consulutions Ltd | Information & communication | 2016 |
| Continental Gold York Limited | Construction | 2022 |
| Control the Meerkat Ltd | Other services | 2023 |
| Cookie Crubmle Ltd | Hospitality | 2026 |
| Cookson Developments Limited | Construction | 2017 |
| Cooper Haigh Smith Limited | Manufacturing | 2023 |
| Cooperative Innovations Games Limited | Information & communication | 2019 |
| Cooperative Innovations Ltd | Information & communication | 2016 |
| Copper and Moss Ltd | Hospitality | 2020 |
| Coral Occupational Health Ltd | Health & social care | 2026 |
| Coseam Consulting Limited | Professional & scientific | 2023 |
| Cosmosquare Films Limited | Information & communication | 2020 |
| Cotson Reddish & Company (Insurance Brokers) Limited | Financial services | 1974 |
| Cottam & Glaister Limited | Health & social care | 2006 |
| Cottingley Bridge Allotment Gardens Limited(The) | Arts & recreation | 1919 |
| Cottley Trading Company Ltd | Extraterritorial | 2021 |
| Counsel and Strategy Consulting Ltd | Professional & scientific | 2025 |
| Countbricks.Com Limited | Information & communication | 2010 |
| Couture Cosmetics Limited | Other services | 2020 |
| CR Consultancy Recruitment Limited | Administrative & support | 2017 |
| Crabtree Cleaners Ltd | Administrative & support | 2003 |
| Crakehall Holiday LET Ltd | Hospitality | 2019 |
| Crassus Business Development Ltd | Administrative & support | 2025 |
| Crazy Catz Garage Ltd | Wholesale & retail | 2019 |
| CRC Consultancy Recruitment Limited | Administrative & support | 2025 |
| Creation (Yorkshire) Limited | Other services | 2013 |
| Creative Design Group Ltd | Extraterritorial | 2024 |
| Creative Hair Studio (Saltaire) Limited | Other services | 2009 |
| Critcom Climate Limited | Construction | 2024 |
| Croft Leisure Limited | Manufacturing | 2024 |
| Cross Brow LLP | | 2012 |
| Crossconnect UK Limited | Information & communication | 2009 |
| Crowdpro Limited | Wholesale & retail | 2025 |
| Cryotherm Insulation Limited | Construction | 1977 |
| Crysp Limited | Professional & scientific | 2019 |
| Crystal Apothecary UK Limited | Wholesale & retail | 2021 |
| CS Communicate Limited | Information & communication | 2004 |
| Cssk Inns Ltd | Hospitality | 2025 |
| Cubed Resourcing Ltd | Administrative & support | 2012 |
| Cultures (North) Ltd. | Wholesale & retail | 2023 |
| Cunningham Piano Services Limited | Arts & recreation | 2003 |
| Curompton Limited | | 1976 |
| Curves Fashion & Lingerie Ltd | Wholesale & retail | 2025 |
| CUT Price Carpets Limited | Wholesale & retail | 2018 |
| Cutting Crew Ltd | Other services | 2025 |
| CW Embroidery Ltd | Manufacturing | 2023 |
| CW Joinery (Yorkshire) Limited | Construction | 2024 |