| Craven & Craven Limited | Wholesale & retail | 2014 |
| Creative Capers Limited | Wholesale & retail | 2020 |
| Creed Music Ltd | Arts & recreation | 2023 |
| Crown and Crest Limited | Real estate | 2024 |
| Crush | Financial services | 2025 |
| Cunimbus Limited | Financial services | 1991 |
| Curlew Cottage Limited | Construction | 2024 |
| Custom Camper Blinds Limited | Manufacturing | 2025 |
| CUT & Go (Ripon) Ltd | Other services | 2024 |
| CWB Communications Ltd | Information & communication | 2020 |
| CWB Property Rental Ltd | Real estate | 2023 |
| Cycept Services Ltd | Information & communication | 2017 |
| D C Property (Yorkshire) Limited | Hospitality | 2021 |
| D Farrell & Co Ltd | Wholesale & retail | 2002 |
| D Sockett Groundworks Ltd | Construction | 2021 |
| D&T King Investments Limited | Professional & scientific | 2026 |
| D.S. Robinson (Farms) Limited | Agriculture & fishing | 1976 |
| DAC Sports Limited | Wholesale & retail | 2016 |
| Dagger Diving Services Limited | Manufacturing | 2017 |
| Dalby Management Limited | Financial services | 2012 |
| Dales Calcs Ltd | Professional & scientific | 2017 |
| Dales Dreams Limited | Hospitality | 2021 |
| Dales Renovation Limited | Manufacturing | 2016 |
| Dales Water Services Limited | Construction | 1979 |
| Dalesgate Press Limited | Manufacturing | 1983 |
| Dallowgill Estate Management | Real estate | 2013 |
| Dalodds Holdings Limited | Financial services | 2024 |
| Dalton Engineering Ltd | Manufacturing | 2009 |
| Dalton Equipment Ltd | Manufacturing | 1989 |
| Dalton Trading Ltd | Wholesale & retail | 2025 |
| Daniel Powell Ltd | Professional & scientific | 2012 |
| Dante Developments Limited | Construction | 2018 |
| Dapo Holdings Ltd | Financial services | 2016 |
| Dare to BE Different Limited | Wholesale & retail | 2025 |
| Dark Matter Designs Ltd | Professional & scientific | 2022 |
| Darwall Investments Limited | Real estate | 1964 |
| Darwin Enterprise & Investments Ltd | Real estate | 2014 |
| David Box Ltd | Construction | 2011 |
| David Charles Limited | Manufacturing | 2000 |
| Davie Thomson Ltd | Professional & scientific | 2021 |
| Davis & Lund Ltd | Real estate | 2016 |
| Dc&Co Ltd | Real estate | 2022 |
| DE Cabalsar Consulting Ltd | Professional & scientific | 2021 |
| DE Juno Limited | Wholesale & retail | 2018 |
| Dealta Games Ltd | Manufacturing | 2025 |
| Decantillon Films Limited | Information & communication | 2012 |
| DEE DEE Decorations Ltd | Construction | 2023 |
| Deeming Consulting Limited | Professional & scientific | 2024 |
| Deepcutuk Audio Visual & Recording Ltd | Information & communication | 2025 |
| Deerhouse Consulting Limited | Professional & scientific | 2024 |
| Degono Limited | Extraterritorial | 2014 |
| Delamode Nidd Limited | Transport & logistics | 1984 |
| Dendari Limited | Hospitality | 2009 |
| Denise Prentice Accessories Ltd | Wholesale & retail | 2022 |
| Design&Construction London Limited | Construction | 2024 |
| Destination Ripon Ltd | Real estate | 2019 |
| Devara Consultancy Ltd | Professional & scientific | 2024 |
| DEX Investments Limited | Manufacturing | 2018 |
| Dexterity Designs Ltd | Professional & scientific | 2023 |
| DIG IT Gardening Ltd | Administrative & support | 2026 |
| Digitdial Limited | Information & communication | 1988 |
| Diverse HR Consultancy Ltd | Administrative & support | 2025 |
| Diversitea Ltd | Wholesale & retail | 2018 |
| DJI728 Ltd | Professional & scientific | 2023 |
| DLR Capital Limited | Real estate | 2012 |
| DLR Holdings Limited | Administrative & support | 2009 |
| Dogs N Dales Ltd | Other services | 2021 |
| Dogs N Dales RAW Ltd | Other services | 2021 |
| Dogzone Ripon Ltd | Other services | 2022 |
| Donaldson's Auto Centre Limited | Wholesale & retail | 2023 |
| Donutri Ltd | Hospitality | 2021 |
| DPE Properties Limited | Hospitality | 2012 |
| Dpjw Consulting Limited | Financial services | 2026 |
| DR Controls Limited | Information & communication | 2018 |
| DR JC Hard Surface Repair and Restoration Ltd | Construction | 2017 |
| Dragon Inn 888 Ltd | Hospitality | 2023 |
| Dragon Music Ltd | Education | 2012 |
| Draper Farms Limited | Agriculture & fishing | 2011 |
| DU Boulay Residential Ltd | Real estate | 2021 |
| Duncan Mccarthy Ltd | Arts & recreation | 2022 |
| Dunedin Trading Limited | Professional & scientific | 2019 |
| Duprin Professional Services Ltd | Real estate | 2025 |
| Durward Kingsley Estates (Trent) Ltd | Construction | 2011 |
| Durward Kingsley Estates Limited | Construction | 1963 |
| Duskye Integrated Ltd | Administrative & support | 2025 |
| DWB Electrical Ltd | Construction | 2026 |
| E a Northallerton Limited | Professional & scientific | 2012 |
| E a U K Northallerton LLP | | 2016 |
| E Sushi Ltd | Hospitality | 2025 |
| E. Leathley & SON Limited | Construction | 2003 |
| Earth Structures (Europe) Limited | Construction | 2004 |
| East Park Projects Limited | Administrative & support | 2006 |
| East Witton Hydro Limited | Energy | 2016 |
| Easy Move Mortgages Limited | Financial services | 2022 |
| Eavestone Limited | Extraterritorial | 2001 |
| Eboracum Business Consultancy Limited | Professional & scientific | 2024 |
| Eccles Heddon Solicitors Limited | Professional & scientific | 2023 |
| Econ House (Services) Limited | Households | 2000 |
| Eden Psychotherapy Services Limited | Health & social care | 2025 |
| Edg:Architecture Ltd | Professional & scientific | 2019 |