| Capitol Sands Limited | Real estate | 2025 |
| Capretti Ltd | Wholesale & retail | 1977 |
| Capri Kitchen & Bar Limited | Hospitality | 2016 |
| Capsule Wardrobe Limited | Wholesale & retail | 2022 |
| Capture by Emma Ltd | Professional & scientific | 2025 |
| Car World Motors Ltd | Wholesale & retail | 2025 |
| Caravan Agency Ltd | Administrative & support | 2020 |
| Carbon First Group Limited | Professional & scientific | 2024 |
| CARLOGIC365 Limited | Wholesale & retail | 2025 |
| Carmikaze Ltd | Wholesale & retail | 2025 |
| Caroline Louise Dyson Ltd | Extraterritorial | 2025 |
| Carpdork Ltd | Wholesale & retail | 2022 |
| Cart Essentials UK Limited | Wholesale & retail | 2025 |
| Cartmax Ltd | Wholesale & retail | 2026 |
| Castle Force Limited | Other services | 2018 |
| Castleford Domestic Appliances Limited | Wholesale & retail | 2007 |
| Catapult Business Finance Limited | Financial services | 2025 |
| Cave 1972 Limited | Extraterritorial | 2014 |
| CBM Construction (Leeds) Limited | Construction | 2011 |
| CCL (GB) Ltd. | Construction | 2007 |
| CCL Stressing International Limited | Professional & scientific | 2003 |
| CCL Stressing Systems Limited | Manufacturing | 2000 |
| CCO Bradford Limited | Hospitality | 2024 |
| CGS Glazing Yorkshire Limited | Construction | 2018 |
| Chander Development Ltd | Real estate | 2025 |
| Character Taverns Limited | Real estate | 2008 |
| Chenar Barbers Ltd | Other services | 2025 |
| Cherry Tree Developments Limited | Real estate | 2013 |
| Cherrywood AV Limited | Wholesale & retail | 2004 |
| Cheung Property Group Limited | Real estate | 2023 |
| Chickin Ossett Ltd | Hospitality | 2024 |
| Child's Play Limited | Education | 2024 |
| Chris M Holford Pipe Organ Builders Ltd | Manufacturing | 2023 |
| Church Lane (Normanton) Limited | Real estate | 2021 |
| Cidi Investments (Wakefield) Limited | Real estate | 1975 |
| Citric Marlborough Limited | Real estate | 2025 |
| Citricity Limited | Information & communication | 2009 |
| CJ Commercial Services Ltd | Wholesale & retail | 2024 |
| CJL Investment Properties Ltd | Real estate | 2018 |
| CJR Building Services Engineers Limited | Professional & scientific | 2021 |
| CJW Property Solutions Ltd | Real estate | 2021 |
| CK1 Solutions Ltd | Construction | 2020 |
| CLA Joinery Limited | Construction | 2023 |
| Classico Italiano Ltd | Hospitality | 2017 |
| Clay Estates Limited | Construction | 2022 |
| Clayborn Holdings Limited | Financial services | 2024 |
| Clayton Civil Engineering & Environmental Services Ltd | Administrative & support | 2015 |
| Clean House Carpet Cleaning Ltd | Administrative & support | 2023 |
| Cleaner Cooling Yorkshire Ltd | Construction | 2023 |
| Clear Accountancy Services (Yorkshire) Ltd | Professional & scientific | 2016 |
| Cloud 9 Bedding Ltd | Wholesale & retail | 2021 |
| Cloud Start Ltd | Information & communication | 2024 |
| Clough Farm Meadow (Management) Limited | Professional & scientific | 2003 |
| Club Pebble Ltd | Financial services | 2023 |
| CM Event Recruitment Ltd | Hospitality | 2018 |
| CMS Building Services Ltd | Construction | 2019 |
| Cockell Properties Limited | Real estate | 2020 |
| Cockell Properties Yorkshire Ltd | Real estate | 2022 |
| Code 11 Caravans and Motorhomes Ltd | Wholesale & retail | 2022 |
| Code 11 Limited | Manufacturing | 2017 |
| Code Monkey Studios Limited | Information & communication | 2012 |
| Coffee Station North East Limited | Hospitality | 2007 |
| Cohep Limited | Professional & scientific | 2021 |
| Coles Property Developments Limited | Real estate | 2022 |
| Colley Properties Ltd | Real estate | 2022 |
| Comedy at the Club Limited | Administrative & support | 2026 |
| Commonfield Furniture Limited | Wholesale & retail | 2024 |
| Complete Ventilation Suppliers (Yorkshire) Ltd | Administrative & support | 2005 |
| Concept Car & Commercial Ltd | Wholesale & retail | 2021 |
| Conceptpc Limited | Information & communication | 2003 |
| Concorde Cloud Solutions Limited | Information & communication | 1986 |
| Concorde Communications Limited | Information & communication | 1999 |
| Concorde Cyber Security Limited | Information & communication | 1999 |
| Concorde Excel Holdings Limited | Information & communication | 2008 |
| Concorde Informatics Technology Group Limited | Information & communication | 1985 |
| Concorde Technology Group Limited | Information & communication | 1985 |
| Conol Heating Limited | Construction | 2018 |
| Cosandier Consulting Ltd | Professional & scientific | 2019 |
| Cosmic Spark Productions Ltd | Information & communication | 2025 |
| Cossins Conveyancing Services Limited | Professional & scientific | 2022 |
| Cosy Koala Ltd | Other services | 2023 |
| Counting House Pontefract Ltd | Hospitality | 2024 |
| Crafted Luxe Furniture Ltd | Wholesale & retail | 2025 |
| Cranmer Care Management Ltd | Professional & scientific | 2024 |
| Creative 23 Limited | Professional & scientific | 2018 |
| Critical Installation Services Limited | Energy | 2007 |
| Crofts Motorcycles Ltd | Wholesale & retail | 2025 |
| Crook and Herbert Accountants Limited | Professional & scientific | 2021 |
| Crumbleberry Ltd | Wholesale & retail | 2019 |
| CVC Labs Ltd | Wholesale & retail | 2025 |
| D C Builders (Pontefract) Limited | Construction | 2003 |
| D S Tattoo Limited | Other services | 2022 |
| D W Wilson Wholesale Limited | Other services | 2014 |
| D.M.F. Employee Ownership Trustee Limited | Professional & scientific | 2021 |
| Daletech Holdings Limited | Real estate | 2017 |
| DAN Whincup Coaching & Consulting Services Limited | Administrative & support | 2025 |
| Dangerously Acquainted Ltd | Arts & recreation | 2025 |
| Danya Holdings Ltd | Financial services | 2023 |
| Dave Dickinson & Associates Limited | Professional & scientific | 1989 |
| Dave G Services Ltd | Manufacturing | 2010 |