| CWS Auto's Limited | Wholesale & retail | 2010 |
| CWS Properties Yorkshire Ltd | Real estate | 2024 |
| Cws-Gb Limited | Construction | 2026 |
| CWT Technologies Ltd | Information & communication | 2017 |
| CWX Ltd | Information & communication | 2023 |
| CX Consultants International Limited | Wholesale & retail | 2016 |
| CX Design Consulting Ltd | Professional & scientific | 2025 |
| CX Pathways Ltd | Professional & scientific | 2023 |
| CX Solutions Ltd | Professional & scientific | 2024 |
| CXI 92 Limited | Real estate | 1996 |
| CY Property Yorkshire Ltd | Real estate | 2024 |
| CYA Ltd | Professional & scientific | 2015 |
| Cyan Studios Limited | Professional & scientific | 2005 |
| Cyanix Ltd | Information & communication | 2025 |
| Cyanx Ltd | Wholesale & retail | 2005 |
| Cyber Behaviour Specialists Limited | Information & communication | 2024 |
| Cyber Crisis Readiness and Response Ltd | Professional & scientific | 2024 |
| Cyber Excellis Consulting Ltd | Extraterritorial | 2024 |
| Cyber Intelligence Group Limited | Information & communication | 2024 |
| Cyber Security Partners Limited | Information & communication | 2019 |
| Cyber Systems Development Limited | Information & communication | 2025 |
| Cyber Wheelhouse Consultancy Ltd | Information & communication | 2020 |
| CYBER4CLOUD Ltd | Information & communication | 2021 |
| Cybercredits Limited | Wholesale & retail | 2021 |
| Cybermerch Limited | Manufacturing | 2020 |
| Cyberscout Limited | Administrative & support | 2014 |
| Cycle Supreme Ltd | Wholesale & retail | 2012 |
| Cycle Care Leeds Limited | Manufacturing | 2020 |
| Cycle Gear (Halifax) Limited | Wholesale & retail | 2020 |
| Cycle Leeds Limited | Education | 2014 |
| Cycle North CIC | Education | 2017 |
| Cyclesure Holdings Ltd | Professional & scientific | 2010 |
| Cycling Sales Agencies Ltd | Wholesale & retail | 2018 |
| Cyclone Ventilation Ltd | Manufacturing | 2010 |
| Cyfer Ltd | Administrative & support | 2017 |
| Cygnet International Limited | Financial services | 1991 |
| Cygnet Park LLP | | 2012 |
| Cygnet Yarns Limited | Wholesale & retail | 1987 |
| Cygnus Investment Management Limited | Financial services | 2010 |
| Cylantic International Limited | Professional & scientific | 2019 |
| Cylinder-Tech Limited | Administrative & support | 2008 |
| Cymbol Ltd | Professional & scientific | 2011 |
| Cynghori Limited | Professional & scientific | 2025 |
| Cypc Homes Limited | Real estate | 2023 |
| Cypress Avenue Limited | Real estate | 1998 |
| Cypress Point Residential Association Limited | Real estate | 2009 |
| Cyprus Garage Limited | Wholesale & retail | 2013 |
| Cyril Luff (Metal Decorators) Limited | Manufacturing | 1979 |
| Cystar Insurance Services Limited | Financial services | 2004 |
| CZW Design and Development Limited | Real estate | 2017 |
| D & a Safety Limited | Professional & scientific | 2007 |
| D & B Supplies Limited | Water & waste | 2015 |
| D & C Gibson (Tiling) Ltd | Administrative & support | 2014 |
| D & C Plant Hire Limited | Construction | 2015 |
| D & C Property Holdings Limited | Real estate | 2015 |
| D & D Childcare Services Limited | Education | 2011 |
| D & D Commercial (Yorkshire) Ltd | Real estate | 2024 |
| D & D Crystal Cleaning & Support Services Limited | Administrative & support | 2017 |
| D & D Leisure Parks Ltd | Hospitality | 2024 |
| D & E Longfellow Prop ACC Limited | Households | 2024 |
| D & F United Ltd | Wholesale & retail | 2021 |
| D & F Wines Ltd | Wholesale & retail | 2018 |
| D & G Commercials Ltd | Manufacturing | 2012 |
| D & G Moves Ltd | Transport & logistics | 2024 |
| D & M Fish Restaurant and Takeaway Ltd | Hospitality | 2021 |
| D & M Watt Properties Limited | Real estate | 2004 |
| D & N Properties Management Ltd | Real estate | 2024 |
| D & R Childcare Limited | Education | 2009 |
| D & R Griffiths Ltd | Construction | 2004 |
| D & S Leeds Retail Ltd | Wholesale & retail | 2025 |
| D & S Mackay (Joinery) Limited | Construction | 2014 |
| D & S Tyres Leeds Ltd | Wholesale & retail | 2022 |
| D & S Tyres Limited | Wholesale & retail | 2019 |
| D & W Developments Limited | Construction | 2002 |
| D & Y Mobiles Ltd | Wholesale & retail | 2026 |
| D a & Co (Yorkshire) Ltd | Wholesale & retail | 2025 |
| D a Boyes Interiors Ltd | Construction | 2009 |
| D a Dorling Building Services Limited | Construction | 2017 |
| D a Plant Services Ltd | Wholesale & retail | 2015 |
| D a Roberts Holdings Limited | Administrative & support | 2017 |
| D a Wood and Sons (Holdings) Limited | Real estate | 2024 |
| D a Wood and Sons (Stanley) Limited | Real estate | 2025 |
| D a Wood and Sons Ltd | Real estate | 2019 |
| D Azam Limited | Administrative & support | 2013 |
| D B Spares Ltd | Wholesale & retail | 2022 |
| D Beel Estates Ltd | Real estate | 2022 |
| D Brook Limited | Extraterritorial | 2017 |
| D Burke & Co Limited | Professional & scientific | 2015 |
| D C G Financial Planning Solutions Ltd | Financial services | 2014 |
| D C Precision Plant Limited | Extraterritorial | 2016 |
| D C Quants Limited | Construction | 2003 |
| D Cooper Electrical Ltd | Construction | 2023 |
| D Culligan Ltd | Hospitality | 2025 |
| D D I Cleaning Services Ltd | Administrative & support | 2024 |
| D Electrics Ltd | Extraterritorial | 2023 |
| D F C Leeds Ltd | Hospitality | 2021 |
| D Gardner Electrical Limited | Construction | 2007 |
| D H Auto Electrical and Cctv Limited | Manufacturing | 2011 |
| D Hallas Electrical Limited | Construction | 2008 |
| D J Brook Limited | Professional & scientific | 2014 |