| Coley Properties Limited | Administrative & support | 2004 |
| Comet Steel Ltd | Construction | 2012 |
| Comfortable Nights Hotel Limited | Hospitality | 2025 |
| Company Calderdale Community Taekwondo Community Interest Company | Arts & recreation | 2020 |
| Compare Your Business Waste Ltd | Administrative & support | 2017 |
| Complete Advice Services Limited | Professional & scientific | 2003 |
| Complete Hold Audio Ltd | Information & communication | 2022 |
| Compliance Insight UK Ltd | Professional & scientific | 2025 |
| Connecting Defi Limited | Financial services | 2020 |
| Contractors Wardrobe Inc. | | 1990 |
| Conzsec Security Training and Facilities Management Ltd | Education | 2023 |
| Core Studios Ltd | Extraterritorial | 2016 |
| Corner Shop (Brig) Ltd | Wholesale & retail | 2026 |
| Country Carpets Limited | Wholesale & retail | 2005 |
| CPS Pubs Ltd | Hospitality | 2020 |
| Crafty FOX on TAP Ltd | Hospitality | 2025 |
| CRB Consultancy Services Ltd | Financial services | 2015 |
| Creation Wines UK Limited | Wholesale & retail | 2017 |
| Crest Pest Control Limited | Administrative & support | 2012 |
| CRH Mechanical and GAS Services Limited | Construction | 2023 |
| Crossfell Kirkland Ltd | Professional & scientific | 2020 |
| Crossley & Co Properties Ltd | Construction | 2026 |
| Crossley Walkington Properties Ltd | Real estate | 2026 |
| Crow Nest Park G.C. Ltd | Arts & recreation | 2011 |
| Csnd Occasio Limited | Financial services | 2023 |
| Ctcnc Ltd | Manufacturing | 2020 |
| Cullercoats Landholdings Limited | Construction | 2018 |
| Curiolo Ltd | Information & communication | 2023 |
| Curiouser & Curiouser Media Ltd | Information & communication | 2022 |
| Curry Chef Yorkshire Ltd | Hospitality | 2017 |
| Curzon Calder Limited | Real estate | 2021 |
| Cute Companions Limited | Health & social care | 2007 |
| Czerwik Limited | Wholesale & retail | 2012 |
| D a Electrical (Services) Limited | Construction | 2013 |
| D D Davidson Properties Ltd. | Real estate | 2014 |
| Dabb Wellness Limited | Wholesale & retail | 2024 |
| Dallys Mobile Valets Ltd | Administrative & support | 2025 |
| Danalight UK Limited | Manufacturing | 2012 |
| Daniel J Thaxter (DJT) Ltd | Professional & scientific | 2026 |
| Dans Drops&Recoveries Ltd | Transport & logistics | 2025 |
| DAT Plumbing & Heating Ltd | Construction | 2024 |
| Data Protection Limited | Extraterritorial | 1994 |
| Dave Cavanagh Plumbing Heating & GAS Services Ltd | Construction | 2012 |
| Davidson Carpets Limited | Wholesale & retail | 2013 |
| Dawson Plumbing & Heating Limited | Construction | 2019 |
| Daydream Publications Limited | Information & communication | 2012 |
| DBD (Holdings) Ltd | Professional & scientific | 2009 |
| DE Luca Developments Limited | Other services | 2017 |
| DE Luca Family Limited | Administrative & support | 2022 |
| DE Luca West Financial Planning Limited | Financial services | 2019 |
| Deantrend Management Company Limited | Households | 1988 |
| Debriefed Ltd | Wholesale & retail | 2025 |
| Debriefed Underwear Ltd | Wholesale & retail | 2018 |
| Definitions Limited | Extraterritorial | 1957 |
| Delaney Management Limited | Real estate | 2020 |
| Delice D'Ivoire Limited | Hospitality | 2018 |
| Della Corner Market Ltd | Wholesale & retail | 2026 |
| Della Shop Limited | Wholesale & retail | 2025 |
| Delm Group Ltd | Financial services | 2023 |
| Demarzo Ltd | Manufacturing | 2018 |
| Dench Properties Ltd | Real estate | 2021 |
| Denford Limited | Manufacturing | 1944 |
| Denford Machine Tools Limited | Professional & scientific | 1961 |
| Denford Properties Ltd | Real estate | 2024 |
| Dermace Beauty Ltd | Other services | 2019 |
| Desa Systems Limited | Manufacturing | 1999 |
| Design Glass Limited | Manufacturing | 2002 |
| Devowl Ltd | Wholesale & retail | 2025 |
| DHG Entertainment Ltd | Hospitality | 2025 |
| Dickinson (Holdings) Limited | Administrative & support | 2010 |
| Direct Card Solutions Holdings Limited | Administrative & support | 2021 |
| Direct Card Solutions Limited | Administrative & support | 2013 |
| Direct Cars Sales Yorkshire Ltd | Wholesale & retail | 2019 |
| Directhand Limited | Real estate | 1994 |
| Districtbrighouse Ltd | Hospitality | 2026 |
| DL Hartley Logistics Ltd | Transport & logistics | 2025 |
| Dobb Leisure Limited | Hospitality | 2024 |
| Dobson's Building & Landscaping Ltd | Administrative & support | 2011 |
| Dons Discount Stores Limited | Wholesale & retail | 2017 |
| Doorsan Limited | Wholesale & retail | 2007 |
| Double K Sameday Limited | Transport & logistics | 2015 |
| Dough Brighouse Limited | Hospitality | 2023 |
| Dough Northowram Limited | Hospitality | 2026 |
| Doyle.Rehab Ltd | Health & social care | 2022 |
| DP Property Limited | Real estate | 2025 |
| DQ Automotive Ltd | Wholesale & retail | 2024 |
| DR Quicknotes Ltd | Information & communication | 2013 |
| Draco Engineering Solutions Limited | Mining & quarrying | 2023 |
| Dragonfly Design and Build Limited | Construction | 2026 |
| DRI Property Solutions Ltd | Construction | 2020 |
| Dronsfield Consulting Limited | Extraterritorial | 2016 |
| Dset Trustee Limited | Extraterritorial | 2013 |
| Dynamic Finance Options Ltd. | Administrative & support | 2016 |
| Dyson Consultancy Limited | Professional & scientific | 2016 |
| E D & L Taylor Limited | Other services | 2011 |
| E-Commerce Avenue Ltd | Wholesale & retail | 2025 |
| E-Valuate Consultants Limited | Professional & scientific | 2019 |
| E.P.I.C. Limited | Real estate | 1937 |
| Eastlore Ltd | Professional & scientific | 2016 |
| Eastmanor Homes Limited | Households | 2005 |