| Climate Control (Yorkshire) Limited | Wholesale & retail | 2004 |
| Cloud Supplies Limited | Wholesale & retail | 2021 |
| Cloudcomm 360 Ltd | Information & communication | 2019 |
| Clough Trustees LLP | | 2002 |
| Clumber Services Ltd | Professional & scientific | 2021 |
| CMH Accounting Services Ltd | Professional & scientific | 2018 |
| CML Orangeries & Extensions Limited | Construction | 2020 |
| CMS Flooring Limited | Construction | 2016 |
| CNC OIL Skimmers Limited | Manufacturing | 2015 |
| Cocoms Limited | Information & communication | 2002 |
| Coffee Red Limited | Hospitality | 2008 |
| Coldseal Eco Upgrades UK Ltd | Construction | 2018 |
| Colins Private Hire Limited | Transport & logistics | 2020 |
| Colorway Blinds Limited | Manufacturing | 1997 |
| Colton Consultants Limited | Professional & scientific | 2025 |
| Combined Logistics Lines (UK) Limited | Administrative & support | 2000 |
| Comfort Treadmills Ltd | Extraterritorial | 2025 |
| COMFORT24 Ltd | Manufacturing | 2014 |
| Commercial Fleet Services (Yorkshire) Limited | Wholesale & retail | 2005 |
| Community Innovations Enterprise LLP | | 2011 |
| Compact Creative Limited | Professional & scientific | 2010 |
| Compass North Ltd | Professional & scientific | 2026 |
| Complete Interior Installations Ltd | Construction | 2010 |
| Complete Utility Solutions Limited | Construction | 2010 |
| Completus Ltd | Real estate | 2024 |
| Complex Access Solutions Ltd | Construction | 2020 |
| Concept Architecture and Planning Ltd | Professional & scientific | 2017 |
| Construction Estimating Services Limited | Construction | 2014 |
| Contact Centre Specialists Limited | Information & communication | 2012 |
| Copier Consumables Limited | Wholesale & retail | 2020 |
| Coppice Field Five Limited | Real estate | 2017 |
| Copy Concept Limited | Wholesale & retail | 2016 |
| Coralee Limited | Hospitality | 2022 |
| Core Cost Consultancy Ltd | Extraterritorial | 2017 |
| Core Integrated Solutions Limited | Administrative & support | 2008 |
| Corretto Leisure Ltd | Hospitality | 2022 |
| CPS Management Ltd | Construction | 2023 |
| Craftsy's Spray Shop Limited | Wholesale & retail | 2015 |
| Craig Carter Builders Limited | Construction | 2011 |
| Crayon Roofing Ltd | Construction | 2022 |
| Create Bespoke Kitchens Limited | Administrative & support | 2016 |
| Create German Kitchens Limited | Construction | 2013 |
| Creative Progress Ltd | Hospitality | 2018 |
| Creative Waterjet Limited | Manufacturing | 2008 |
| CRL (Yorkshire) Limited | Professional & scientific | 2010 |
| Croft Cargo Limited | Transport & logistics | 2010 |
| Croft Cargo Properties Limited | Real estate | 2022 |
| Croft House (Care) Limited | Health & social care | 1998 |
| Cross Valley IT Ltd | Wholesale & retail | 2025 |
| Crossco (1427) Limited | Extraterritorial | 2017 |
| CRU Garden Services Limited | Administrative & support | 2024 |
| CS Renovations Limited | Construction | 2023 |
| CS Technical LLP | | 2022 |
| CSB E-Com Ltd | Wholesale & retail | 2024 |
| CSP Investment Holdings Ltd | Financial services | 2015 |
| CT Creative INK Limited | Other services | 2026 |
| CTD Healthcare Consulting Ltd | Professional & scientific | 2025 |
| Ctwalker Electrical Limited | Construction | 2017 |
| Curiosa Brands Ltd | Manufacturing | 2025 |
| Currant Hospitality Ltd | Hospitality | 2022 |
| Curry Masters Pizza Bar Ltd | Hospitality | 2024 |
| Curtain and Blind Decor Limited | Professional & scientific | 1977 |
| Curtlia Ltd | Professional & scientific | 2024 |
| Curved Frame Specialists Limited | Manufacturing | 2003 |
| Custom Car Mats Ltd | Manufacturing | 2018 |
| Custom Manufacturing Ltd | Manufacturing | 2019 |
| Cutwel Limited | Wholesale & retail | 1996 |
| CWN Accountancy Services Limited | Professional & scientific | 2025 |
| CWN Accountants LLP | | 2018 |
| CWN Bookkeeping Services Limited | Professional & scientific | 2025 |
| Cycle Assembly Network Limited | Manufacturing | 2011 |
| CYS Online Limited | Administrative & support | 2014 |
| D & C Consultants Limited | Professional & scientific | 2024 |
| D & T Projects (Yorkshire) Ltd | Real estate | 2025 |
| D B Signature Construction Ltd | Construction | 2026 |
| D Hopkins Ltd | Transport & logistics | 2025 |
| D V Optical Limited | Health & social care | 2006 |
| D W Taylor Estate Agents Limited | Real estate | 2025 |
| D&M Middleton Limited | Real estate | 2009 |
| D&M Ventures Ltd | Real estate | 2017 |
| D3 Hospitality Ltd | Wholesale & retail | 2023 |
| D3 Traders Limited | Wholesale & retail | 2024 |
| D5 Estate Agents Limited | Real estate | 2014 |
| D9525 Limited | Administrative & support | 2022 |
| Dale Homes (Yorkshire) Limited | Construction | 2015 |
| Daley Property Group Ltd | Real estate | 2023 |
| Daley Property Management Ltd | Real estate | 2023 |
| DAN Gregory Electrical Contractors Ltd | Construction | 2024 |
| Dandelion Organisation Ltd. | Education | 2018 |
| DANNY123 Ltd | Transport & logistics | 2026 |
| Dapper Duds Ping Ltd | Wholesale & retail | 2023 |
| Datela Ltd | Real estate | 2022 |
| David Anthony Recruitment Limited | Administrative & support | 2019 |
| David Haycock Architecture Ltd | Professional & scientific | 2011 |
| David Milnes Limited | Professional & scientific | 2002 |
| David Page Ltd | Construction | 2015 |
| David Walker Sales and Lettings Ltd | Real estate | 2018 |
| Davis.Mcgill Couriers Ltd | Transport & logistics | 2023 |
| Day One Solutions Limited | Professional & scientific | 2023 |
| Day One Technologies Limited | Professional & scientific | 1997 |