| Coranyl Ltd | Transport & logistics | 2021 |
| Cornerstone Construction Solutions Limited | Administrative & support | 2010 |
| Cornerstone Europe Limited | Financial services | 2022 |
| Corrie House Investments Limited | Real estate | 2004 |
| Corrotech Coatings Ltd | Construction | 2025 |
| Cosmos Telecom Limited | Wholesale & retail | 2006 |
| Country Classics Ltd | Other services | 2018 |
| County Chiropractic Ltd | Health & social care | 2005 |
| Courson Associates Limited | Professional & scientific | 2017 |
| Courtesy Trading Ltd | Other services | 2014 |
| Courtney House Limited | Real estate | 1989 |
| Crafty Wizards Limited | Education | 2011 |
| Crafty Wizards Nursery Ltd | Education | 2024 |
| Crafty Wizards Pre-School Ltd | Health & social care | 2022 |
| Crafty Wizards Schools Ltd | Education | 2025 |
| Crafty Wizards World Limited | Education | 2014 |
| Craig Oates Building Services Ltd | Construction | 2025 |
| Craig Wilson Engineering Ltd | Manufacturing | 2019 |
| Cray Bakes Ltd | Wholesale & retail | 2021 |
| Createtvt Ltd | Professional & scientific | 2017 |
| Creator Maker Holdings Limited | Financial services | 2024 |
| Creator Maker Ltd | Administrative & support | 2023 |
| Crisor Trans Ltd | Administrative & support | 2016 |
| Crisp Scaffolding Solutions Ltd | Construction | 2022 |
| Crispy FRY Ltd | Hospitality | 2025 |
| Cristian Logistics Limited | Transport & logistics | 2015 |
| CRM Healthcare Solutions Ltd | Administrative & support | 2023 |
| Crosshills Pigs Limited | Agriculture & fishing | 2001 |
| Crowded Rose Ltd | Wholesale & retail | 2023 |
| Crown Properties (York) Limited | Real estate | 2019 |
| CRR Consultancy Ltd | Information & communication | 2020 |
| Crystals Car Sales Limited | Wholesale & retail | 2021 |
| CS Builders Ltd | Construction | 2021 |
| CS Onsite Solutions Ltd | Administrative & support | 2020 |
| Cube (Yorkshire) Ltd | Water & waste | 2008 |
| Custom Filter Co. Limited | Manufacturing | 2006 |
| Custom Vehicle Logistics Ltd | Transport & logistics | 2024 |
| CV Recruitment Limited | Information & communication | 2004 |
| Cyberlincs Ltd | Information & communication | 2025 |
| C’S Autocare Ltd | Wholesale & retail | 2025 |
| D & G Fabrications Ltd | Manufacturing | 2018 |
| D & V Investments Limited | Real estate | 2014 |
| D B Therapy Limited | Health & social care | 2012 |
| D E C Masonry Limited | Construction | 2017 |
| D H M Gill Transport Consultancy Limited | Transport & logistics | 2023 |
| D Ilami Bookkeeper Ltd | Professional & scientific | 2025 |
| D J S Drylining and Ceilings Ltd | Construction | 2024 |
| D M Heritage Ltd | Education | 2009 |
| D S Electrical Selby Ltd | Construction | 2014 |
| D W Traction Limited | Transport & logistics | 2009 |
| D&R Love Property Management Ltd | Households | 2025 |
| Dairy Doorstep Solutions Ltd | Professional & scientific | 2021 |
| Daisybluebelle Limited | Wholesale & retail | 2017 |
| Dammywale Limited | Health & social care | 2015 |
| Damson Farm Ltd | Agriculture & fishing | 2022 |
| Danehill Living Ltd | Construction | 2024 |
| Danny Wilson Limited | Construction | 2016 |
| Dark Water Pensions Limited | Financial services | 2014 |
| Darren Williams Electrics UK Limited | Energy | 2016 |
| Dash Traffic Management Ltd | Construction | 2023 |
| Data Valley Systems Limited | Information & communication | 2000 |
| Datavalley Sales Limited | Information & communication | 1994 |
| Date for My DAD Productions Limited | Information & communication | 2019 |
| Datun Construction Limited | Construction | 2021 |
| Daveylodge Ltd | Professional & scientific | 2015 |
| David Barber Restoration Limited | Wholesale & retail | 2015 |
| Dawson Training Ltd | Professional & scientific | 2022 |
| DB Procurement Consultancy Ltd | Professional & scientific | 2019 |
| Dbaz Trading Ltd | Financial services | 2025 |
| DBD Expert Ltd | Transport & logistics | 2021 |
| DCN & Associates Limited | Professional & scientific | 2022 |
| Deadswag Ltd | Wholesale & retail | 2024 |
| Deady Ltd | Real estate | 2025 |
| Dear Family Farms Limited | Agriculture & fishing | 2025 |
| Decanter Leeds Limited | Hospitality | 2026 |
| Decsum Ltd | Real estate | 2022 |
| Delf Developments Limited | Construction | 2023 |
| Demon Group Limited | Information & communication | 2023 |
| Derwent Bridge Properties Ltd | Construction | 2025 |
| Designpix Ltd | Professional & scientific | 2011 |
| Destination Vinyl Limited | Manufacturing | 2016 |
| Detailing Dreams Limited | Wholesale & retail | 2025 |
| Deus Productions Limited | Information & communication | 2018 |
| Dewar Planning Associates Limited | Professional & scientific | 2025 |
| Dewsbury Health Limited | Wholesale & retail | 2025 |
| DG Motorsport Ltd | Professional & scientific | 2019 |
| DH & PM Wilson Ltd | Wholesale & retail | 2017 |
| DH Civils Yorkshire Ltd | Construction | 2018 |
| Diamond Klean Autocare Ltd | Administrative & support | 2026 |
| Diane's Nurseries Ltd | Education | 2016 |
| Dickinson Stuart Limited | Wholesale & retail | 2023 |
| Digwel Contracts Ltd | Administrative & support | 2011 |
| Dilmun Enterprises Ltd | Real estate | 2016 |
| Dinsley Developments Ltd | Construction | 2025 |
| Directory Enquiries Limited | Information & communication | 2025 |
| Dirt Monkey UK Ltd | Wholesale & retail | 2021 |
| Discon Holdings Ltd | Financial services | 2024 |
| DJ Joinery & Building Limited | Construction | 2023 |
| DJB Acquisitions Ltd | Real estate | 2025 |
| DK Groundworks Limited | Administrative & support | 2022 |