| CDH Construction Limited | Construction | 2017 |
| Centre of Integrative Health( UK) Ltd | Health & social care | 2024 |
| Centurion Property Developments Limited | Construction | 2022 |
| Chablis Associates Limited | Construction | 1994 |
| Chatta Limited | Education | 2015 |
| Cheaplymay Ltd | Administrative & support | 2012 |
| Checkstone Limited | Manufacturing | 2014 |
| Children WHO CAN Ltd | Wholesale & retail | 2019 |
| Chip N Paint Limited | Wholesale & retail | 2017 |
| Chitnis Limited | Real estate | 2010 |
| CIG Limited | Other services | 2025 |
| CJ Reed Plumbing & Heating Ltd | Construction | 2021 |
| CJE Property Investments Ltd | Real estate | 2021 |
| Clarpoint Limited | Real estate | 1974 |
| CLD Cleaning Services Ltd | Administrative & support | 2018 |
| Clinton Lloyd Consultancy Limited | Professional & scientific | 2024 |
| CLM Components Limited | Wholesale & retail | 2021 |
| Cloud TEN Events and Media Ltd | Information & communication | 2012 |
| Cobb Homes Limited | Construction | 2024 |
| Colbrooke FOX Limited | Administrative & support | 2011 |
| Colead Consulting Limited | Information & communication | 2019 |
| Colin Jagger Building & Property Services Limited | Construction | 2008 |
| Compass Merchant Services Ltd | Professional & scientific | 2026 |
| Complysure Limited | Information & communication | 2026 |
| Comrie Holiday Park Limited | Hospitality | 1981 |
| Concept Fitting Services Limited | Manufacturing | 2012 |
| Condor Advisory Limited | Professional & scientific | 2019 |
| Configured Systems Ltd | Administrative & support | 2015 |
| Consol Imports (Hull) Limited | Wholesale & retail | 1956 |
| Consolidated Fruit Co. Limited | Manufacturing | 1942 |
| Control My Costs Ltd | Professional & scientific | 2020 |
| Cool Hand Promotions Limited | Arts & recreation | 2013 |
| Core Strength Equipment Ltd | Wholesale & retail | 2017 |
| Corinne Rose Ltd | Manufacturing | 2014 |
| Cornerstone (East Yorkshire) Ltd | Construction | 2025 |
| Cornerstone Homes Private Limited | Real estate | 2025 |
| Cornix Investments Ltd | Real estate | 2021 |
| Cosmetic & Family Dentistry (Brough) Limited | Health & social care | 2015 |
| Coverview Limited | Extraterritorial | 1986 |
| Cowen Associates Safety Service Limited | Professional & scientific | 2026 |
| CRB Solutions (UK) Limited | Professional & scientific | 2008 |
| Cream Studios Project Management Ltd | Hospitality | 2012 |
| Croggi CIC | Construction | 2025 |
| Crown BED & Kitchen Ltd | Hospitality | 2025 |
| Crowther Electrical Ltd | Manufacturing | 2021 |
| Crystal Heart Salad Company Limited | Agriculture & fishing | 1971 |
| Ctrl Surveying Ltd | Professional & scientific | 2021 |
| Cult Collectables Ltd | Wholesale & retail | 2026 |
| Culture of Habit Ltd | Arts & recreation | 2026 |
| Cutting Edge Solutions Ltd | Information & communication | 2024 |
| Cyanbytes Ltd | Manufacturing | 2024 |
| Czech Homes Ltd | Real estate | 2025 |
| D & D Developments ( Brough ) Limited | Construction | 2018 |
| D Gibson Joinery & Building Services Ltd | Construction | 2017 |
| D M (South Cave) Limited | Real estate | 2015 |
| D R P Solutions Limited | Information & communication | 1997 |
| D. Gray Consulting Ltd | Professional & scientific | 2026 |
| DAB Joinery Limited | Construction | 2017 |
| Dachshund Rescue at the Elms Limited | Agriculture & fishing | 2022 |
| Dacmade Limited | Information & communication | 2017 |
| Dagtech Ltd | Information & communication | 2025 |
| Daneels UK Ltd | Manufacturing | 2006 |
| Dapcas Limited | Information & communication | 2010 |
| Dark Side Copy and Editing Limited | Arts & recreation | 2022 |
| Darren Peterson Marine Services Limited | Transport & logistics | 2015 |
| Dave Green Limited | Professional & scientific | 1995 |
| DC Software Services Ltd | Information & communication | 2019 |
| DDR Autoservices Ltd | Wholesale & retail | 2025 |
| Deal Energy Limited | Financial services | 2018 |
| Dearing Plastics Limited | Manufacturing | 1998 |
| Dearing Tooling Limited | Manufacturing | 2002 |
| Define Studio Hessle Limited | Other services | 2026 |
| Delanesco Limited | Information & communication | 2019 |
| Delta Project Services Ltd | Professional & scientific | 2022 |
| Delta Workforce Ltd | Health & social care | 2013 |
| Deltamex Limited | Professional & scientific | 2001 |
| Dempsey Geoscience Consultancy Ltd | Professional & scientific | 2021 |
| Dental Services (Tools & Equipment Repair) Limited | Health & social care | 2012 |
| Dentech 2020 Limited | Construction | 2013 |
| Derrick White Consulting Ltd | Professional & scientific | 2025 |
| Desired Haven Property Solutions PVT Ltd | Real estate | 2025 |
| Desolate Clothing Limited | Wholesale & retail | 2024 |
| Dimambro R Contracting Ltd | Public administration | 2020 |
| Directors of Finance Limited | Professional & scientific | 2012 |
| Disabled Childrens Trust Ltd | Other services | 2009 |
| Distinctive Wash Ltd | Wholesale & retail | 2011 |
| Dixon Consultancy Services Limited | Administrative & support | 2013 |
| DLP Accountants Limited | Professional & scientific | 2011 |
| Dnay Properties Ltd | Real estate | 2024 |
| Dorsey Limited | Health & social care | 2022 |
| DOT Fifty Seven Ltd | Professional & scientific | 2020 |
| Douglass Homes Limited | Real estate | 2017 |
| DR Katie. Psychological Consultancy Limited | Health & social care | 2016 |
| Drewery Medical Limited | Health & social care | 2019 |
| DRG (Capital) Limited | Wholesale & retail | 2024 |
| Driv Topia Driving Academy Ltd | Education | 2023 |
| DTL Construction & Maintenance Limited | Construction | 2013 |
| Dune Smokehouse Ltd | Hospitality | 2025 |
| Dunn Properties Limited | Real estate | 2022 |
| Durban Limited | Administrative & support | 1992 |