| CNR PVT Ltd | Wholesale & retail | 2022 |
| Coach and Commercial Ltd | Manufacturing | 2018 |
| Coach Reese Limited | Wholesale & retail | 2026 |
| Codetta Bridge Ltd | Education | 2025 |
| Codp Solutions Limited | Health & social care | 2014 |
| Colins & Lyft Ltd | Transport & logistics | 2019 |
| Collab Coffee House Ltd | Hospitality | 2025 |
| Collab Commercial Interiors Ltd | Construction | 2023 |
| Collective FX Ltd | Professional & scientific | 2024 |
| Colliers Cafe Upton Ltd | Hospitality | 2025 |
| Color Coded Limited | Other services | 2016 |
| Complete Technology Systems UK Ltd | Information & communication | 2020 |
| Composite Door Factory (Yorkshire) Ltd | Construction | 2021 |
| Concrete Financial Advisory Ltd | Professional & scientific | 2021 |
| Conference Equipment Services Limited | Arts & recreation | 2018 |
| Confident Money Plan Limited | Professional & scientific | 2024 |
| Conky's Tackle Base Ltd | Wholesale & retail | 2021 |
| Connections First - Independent Social Work Ltd | Other services | 2022 |
| Conops Training Group Limited | Administrative & support | 2026 |
| Conquering the Impossible Ltd | Information & communication | 2017 |
| Consilient Therapy Limited | Professional & scientific | 2019 |
| Consummate Professional HR and Compliance Ltd | Administrative & support | 2024 |
| Contedia Limited | Information & communication | 2001 |
| Cookieverse Ltd | Information & communication | 2016 |
| Cookwell Property Developers Limited | Construction | 2025 |
| Cooper Clothing Co Ltd | Wholesale & retail | 2025 |
| Copperwire Creative Ltd | Professional & scientific | 2015 |
| Cornel Building Services Limited | Construction | 2010 |
| Cornelia Lavinia Healthcare Limited | Health & social care | 2022 |
| Corobeus Sports Consultancy Limited | Health & social care | 2009 |
| Cosmetic Vehicle Solutions Ltd | Wholesale & retail | 2023 |
| Cotronics Manufacturing Ltd | Manufacturing | 2020 |
| Cottam House Management Company Limited | Real estate | 2012 |
| Court House Cafe Ltd | Hospitality | 2023 |
| COX Property Holdings Limited | Real estate | 2021 |
| CP Business Finance Limited | Financial services | 2025 |
| CP Business Holdings & Investments Limited | Hospitality | 2026 |
| CPH Financial Planning Ltd | Financial services | 2018 |
| CPM (Contracts) Limited | Construction | 1989 |
| CPM Contract Services Ltd | Construction | 2015 |
| CPS Plant & Tool Hire Limited | Construction | 2018 |
| CPS Property Developments Limited | Construction | 2014 |
| Crabtree Installations Ltd | Construction | 2026 |
| Crafted Home Solutions Limited | Construction | 2026 |
| Crafted Legacy Ltd | Construction | 2025 |
| Craig Bray Building Services Ltd | Construction | 2016 |
| Craig Smith Ltd | Construction | 2014 |
| Cranswick Properties Ltd | Real estate | 2024 |
| Crazy for Cleaning Ltd | Administrative & support | 2017 |
| Cream Catering Community Interest Company | Hospitality | 2007 |
| Cream TEE Limited | Hospitality | 2023 |
| Creative Formulas Ltd | Arts & recreation | 2007 |
| Creative Influence Ltd | Construction | 2019 |
| Creature Cove Ltd | Other services | 2025 |
| Credit Industry Services Limited | Administrative & support | 2022 |
| Cree Property Solutions Ltd | Real estate | 2026 |
| Creme DU Loch Limited | Wholesale & retail | 2023 |
| Crepes N Desserts Ltd | Wholesale & retail | 2024 |
| Crest Commercial Finance Limited | Financial services | 2021 |
| Criclabs Ltd | Information & communication | 2022 |
| Crixon Ltd | Construction | 2024 |
| Croft Healthcare Ltd | Health & social care | 2016 |
| Cromwells of Pontefract Limited | Hospitality | 2021 |
| Cross Keys New Road Snydale Ltd | Hospitality | 2026 |
| Cross Keys Old Snydale Ltd | Hospitality | 2026 |
| Crown Wellbeing Clinic Ltd | Other services | 2016 |
| CRP Properties and Consultancy Ltd | Construction | 2024 |
| Crusty Pizzeria Limited | Hospitality | 2016 |
| Crystal Clean (Castleford) Ltd | Other services | 2010 |
| CS Creative Solutions Limited | Construction | 2019 |
| CS Drilling Limited | Construction | 2017 |
| CSL Consultancy Ltd | Professional & scientific | 2025 |
| Cslhomes Ltd | Real estate | 2025 |
| CT Kizuna Ltd | Hospitality | 2026 |
| CT Yorkshire Builders Ltd | Construction | 2019 |
| Cubs Daycare Ltd | Administrative & support | 2016 |
| Cuddle & Capture Ltd | Professional & scientific | 2026 |
| Curateur Limited | Wholesale & retail | 2025 |
| Cutting Edge Accounting Ltd | Professional & scientific | 2023 |
| Cutting Edge Tech Ltd | Manufacturing | 2022 |
| Cwsr Ltd | Administrative & support | 2021 |
| Cygnet Wealth Management Limited | Financial services | 2013 |
| Czibor Property Investments Ltd | Construction | 2024 |
| D & H Fabrications Ltd | Manufacturing | 2003 |
| D & L Ford Properties Ltd | Real estate | 2024 |
| D & M Roofing Contractors and Lead Specialists Ltd | Construction | 2022 |
| D and D Doors Limited | Construction | 2018 |
| D Lawrie Electrical Limited | Other services | 2016 |
| D M Auto Parts Ltd | Wholesale & retail | 2023 |
| D S K Fabrications Holdings Limited | Manufacturing | 2018 |
| D S K Fabrications Limited | Manufacturing | 2010 |
| D Wrestle Ltd | Other services | 2023 |
| D&A Bars Limited | Hospitality | 2019 |
| D&E Driver Services Ltd | Transport & logistics | 2012 |
| D&G Piping Solution Limited | Professional & scientific | 2024 |
| D&P Industrial Services Limited | Water & waste | 2025 |
| D'S Daycare Limited | Education | 2014 |
| D. and J. Scaffolding Limited | Construction | 2003 |
| D.G Wilders Installation Ltd | Construction | 2022 |
| D.Midgley Properties Ltd | Construction | 2024 |