| Carnet Flow Limited | Professional & scientific | 2026 |
| Carol Walker-Gunn Homes Ltd | Real estate | 2020 |
| Carr's Tyres Limited | Wholesale & retail | 2005 |
| Carrs Vale Management Company Limited | Real estate | 2026 |
| CAS677 Limited | Wholesale & retail | 2020 |
| Casa by Moda Acquisitions Limited | Real estate | 2022 |
| Casa by Moda Limited | Real estate | 2021 |
| Casa SOL Ltd. | Hospitality | 1998 |
| Caslon Creative Consultants Limited | Information & communication | 2022 |
| Casqol Limited | Information & communication | 2017 |
| Castle and Grey Limited | Professional & scientific | 2015 |
| Castle Road Properties Limited | Real estate | 2014 |
| Castlegate Stationers Limited | Wholesale & retail | 2009 |
| Castleton Properties (Leeds) Ltd. | Financial services | 2019 |
| Cattlemens Holdings Ltd | Financial services | 2020 |
| CC Site Services and Management Limited | Construction | 2025 |
| CCL Finance Limited | Financial services | 2009 |
| CDI Alliance Ltd | Administrative & support | 2011 |
| Ceide Consultancy Limited | Professional & scientific | 2005 |
| Ceseng Ltd | Professional & scientific | 2025 |
| CFK Developments Limited | Real estate | 2000 |
| Chadwick Property Holdings Limited | Construction | 2023 |
| Challenger Corp Limited | Financial services | 2019 |
| Chameleon Learning Solutions Limited | Professional & scientific | 2015 |
| Champagne Warehouse Ltd | Wholesale & retail | 2000 |
| Chapel Hill Road (Pool) Residents Association Limited | Households | 2003 |
| Chapel Lane Distillery Company Ltd | Manufacturing | 2020 |
| Chariot Investments LLP | | 2005 |
| Charliemarksproperties Limited | Real estate | 2024 |
| Chase Atlantic Limited | Wholesale & retail | 2017 |
| Chase Joinery Products | | 2001 |
| Chasingcarsuk Ltd | Wholesale & retail | 2018 |
| Chattering Classes Limited | Education | 2015 |
| Chemical Release Company Limited | Wholesale & retail | 1991 |
| Cherry Thatch Developments Limited | Real estate | 2002 |
| Cherry Thatch Properties Ltd | Real estate | 2017 |
| Chiropractic 1ST Limited | Health & social care | 2006 |
| Chloe Gallon Ltd | Other services | 2026 |
| Chorley Bunce Ltd | Hospitality | 2000 |
| Chris P Gale Limited | Health & social care | 2014 |
| Chuk Enterprises Ltd | Wholesale & retail | 2021 |
| Church Park Yorkshire Limited | Construction | 2014 |
| Chuzu Ltd | Professional & scientific | 2013 |
| Chwuk Ltd | Construction | 2017 |
| Ciai Holdings Ltd | Hospitality | 2024 |
| Cinema Limited | Information & communication | 2000 |
| Cinenorth Limited | Professional & scientific | 2021 |
| Cityfields (Wakefield) Limited | Construction | 2018 |
| CJM Hospitality & Events Ltd | Hospitality | 2024 |
| CJN Solutions Limited | Information & communication | 2005 |
| Claire O'Brien Design Consultant Ltd | Professional & scientific | 2019 |
| Clara Office Management Ltd | Administrative & support | 2020 |
| Clarios Diagnostics Ltd | Professional & scientific | 2026 |
| Claritas Limited | Extraterritorial | 2024 |
| Claritas Solutions Limited | Information & communication | 1996 |
| Clark Cost Consultants Limited | Professional & scientific | 2021 |
| Clarry Peel Limited | Hospitality | 1957 |
| Class Office Equipment Limited | Wholesale & retail | 2003 |
| Classic Motion Ltd | Information & communication | 2022 |
| Clayton Auto Electrics Limited | Wholesale & retail | 2018 |
| Clean Air Holdings Limited | Financial services | 2016 |
| Clean Plastic Mouldings Limited | Manufacturing | 1960 |
| Clear Vision Bi-Folding Doors and Windows Ltd | Construction | 2022 |
| CLEARVIEW98 Limited | Administrative & support | 2013 |
| Clearwinner Innovation Ltd | Professional & scientific | 2012 |
| Clemens Frenshaw Limited | Extraterritorial | 2012 |
| Clemster Properties Limited | Real estate | 2022 |
| Click-Deck Products Ltd | Wholesale & retail | 2019 |
| Clifford Court (1984) Limited | Households | 1984 |
| Clifton View (Osgodby) Management Company Limited | Real estate | 2026 |
| Cloud 9 Windows Limited | Households | 2012 |
| Clough Interim Management Ltd | Professional & scientific | 2006 |
| CLP Management Co. Limited | Households | 2017 |
| CMA Solutions (W Yorks) Limited | Professional & scientific | 2008 |
| CMB Developments Limited | Real estate | 2007 |
| COACHINGU4 Limited | Professional & scientific | 2011 |
| Coenseo Ventures Ltd | Other services | 2023 |
| Colin Hayes Limited | Real estate | 2022 |
| Collective Stories Ltd | Professional & scientific | 2019 |
| Colliergate Commercial Ltd | Real estate | 2026 |
| Colliergate Residential Ltd | Real estate | 2026 |
| Collingham Beer Festival Ltd | Wholesale & retail | 2021 |
| Collingham Catering Services Limited | Wholesale & retail | 2003 |
| Collingham Drycleaners Limited | Other services | 2015 |
| Collingham Fisheries Ltd | Hospitality | 2025 |
| Collingham Fitness Limited | Wholesale & retail | 2019 |
| Colt Industrial Services Limited | Extraterritorial | 1988 |
| Commercial Bricks Property Limited | Real estate | 2024 |
| Commercial Services (Tadcaster) Limited | Wholesale & retail | 1983 |
| Compatible Maintenance Solutions (CMS) Limited | Administrative & support | 2009 |
| Compofloor Limited | Construction | 2019 |
| Compton Grove Farm and Stables Limited | Agriculture & fishing | 2022 |
| Concept Handtufting Limited | Wholesale & retail | 1994 |
| Coneygarth Roadside Ltd | Construction | 2021 |
| Connaught Digbeth Limited | Construction | 2012 |
| Considered Coaching and Training Ltd. | Education | 2016 |
| Consilium ESG Limited | Professional & scientific | 2023 |
| Consoneai Ltd | Professional & scientific | 2020 |
| Constellation Orthopaedic Holdings Limited | Health & social care | 2011 |
| Construction PRE Contract Services Ltd | Construction | 2023 |