| D Ford Implants Ltd | Health & social care | 2021 |
| D G B Joinery Limited | Construction | 2003 |
| D Hall Electrical Services Limited | Manufacturing | 1998 |
| D I Greasley Partnership Ltd | Professional & scientific | 2015 |
| D Kaye Limited | Construction | 2022 |
| D Mack Shopfitters & Joiners Limited | Construction | 2007 |
| D Newland Electrical Ltd | Construction | 2024 |
| D P Spraying Ltd | Construction | 2023 |
| D Rothery Welding & Fabrication Services Ltd | Manufacturing | 2019 |
| D Teal & SON Limited | Construction | 2013 |
| D Underwood & SON Ltd | Construction | 2006 |
| D&A Inspection Services Limited | Professional & scientific | 2022 |
| D&D Roofing Ltd | Construction | 2019 |
| D&F Backgammon Ltd | Hospitality | 2025 |
| D&G Autos Victoria RD Garage Ltd | Wholesale & retail | 2021 |
| D&K Counselling and Therapeutic Services Limited | Health & social care | 2014 |
| D&N Traders Ltd | Wholesale & retail | 2024 |
| D&R Holdings Yorkshire Ltd | Real estate | 2021 |
| D&V D York Ltd | Hospitality | 2025 |
| D-Carbn Analytics Ltd | Information & communication | 2024 |
| D. Bottomley Limited | Wholesale & retail | 2000 |
| D. D. Porter Limited | Construction | 1963 |
| D. S. Estates Limited | Real estate | 1950 |
| D.A.(Wilkinson)Properties Ltd | Real estate | 2024 |
| D.A.V Retail Ltd | Extraterritorial | 2023 |
| D.A.W. Phone Accessories Limited | Wholesale & retail | 2024 |
| D.M. Freight Solutions Ltd | Transport & logistics | 2024 |
| D.Midgley & Sons Limited | Professional & scientific | 1964 |
| D13 Detailing Ltd | Wholesale & retail | 2026 |
| DAC Bricklayers Limited | Construction | 2020 |
| Daedalus Property Group Ltd | Real estate | 2022 |
| Daev Holdings Ltd | Professional & scientific | 2026 |
| Daft BAT Sportz Ltd | Wholesale & retail | 2014 |
| Dagsu Ltd | Information & communication | 2025 |
| Daily Risk Solutions Limited | Professional & scientific | 2017 |
| Dakota Group Limited | Manufacturing | 2023 |
| Dale Homecare Ltd | Health & social care | 2025 |
| Dale Properties (Halifax) Limited | Real estate | 2016 |
| Dalesman Properties Ltd. | Real estate | 2013 |
| Dallas Asset Management Limited | Administrative & support | 2020 |
| Dalton Bakery Ltd | Hospitality | 2024 |
| Daly Equestrian Surfaces Ltd | Professional & scientific | 2022 |
| Damot Limited | Construction | 2008 |
| Damp Proof Systems Limited | Construction | 2021 |
| Damson West Ltd | Wholesale & retail | 2025 |
| DAN Fowler Consulting Ltd | Information & communication | 2022 |
| DAN Horner Limited | Construction | 2017 |
| DAN Wilde Limited | Professional & scientific | 2011 |
| Dance 4 ALL Halifax Ltd | Arts & recreation | 2016 |
| Daniel & Hirst Limited | Real estate | 1992 |
| Daniel Taylor Hairdressing Limited | Other services | 2019 |
| Danny Bell Holdings Limited | Financial services | 2025 |
| Dario's Dessert Ltd | Hospitality | 2022 |
| Dario's Slice Ltd | Hospitality | 2024 |
| Dark Energy Fitness Limited | Arts & recreation | 2025 |
| Darkland Brewery Limited | Manufacturing | 2018 |
| Daroti Consultancy Ltd | Information & communication | 2014 |
| Darren Becks Ltd | Professional & scientific | 2026 |
| Darsons Homes Ltd | Construction | 2016 |
| DAS Business Services Ltd | Information & communication | 2016 |
| Dashax Ltd | Construction | 2017 |
| Dashbee Properties Ltd | Real estate | 2024 |
| Data Tools for Schools Limited | Information & communication | 2011 |
| Dave Bridson Rubbish Removals Limited | Other services | 2023 |
| David Bell SEO Ltd | Professional & scientific | 2019 |
| David FOX Wealth Management Limited | Professional & scientific | 2017 |
| David Gover Auctions Ltd | Other services | 2023 |
| David James Furniture Ltd | Wholesale & retail | 2018 |
| David James Haulage Limited | Transport & logistics | 2025 |
| David Murphy Pipeline Limited | Construction | 2021 |
| David O'Callaghan Design Ltd | Professional & scientific | 2024 |
| David Winters Ltd | Professional & scientific | 2024 |
| Davidson Property Limited | Real estate | 2024 |
| Davis Photographic Limited | Professional & scientific | 2012 |
| Davis Properties Yorkshire Ltd | Real estate | 2023 |
| Davren: Community Solutions C.I.C. | Professional & scientific | 2020 |
| Dawn to Dusk Care Services Limited | Health & social care | 2008 |
| Dawski Development Ltd | Construction | 2023 |
| Dawski Electrical Ltd | Construction | 2026 |
| Dazfabz Limited | Manufacturing | 2024 |
| Dazmo Ltd | Wholesale & retail | 2025 |
| DB Commercial Products Limited | Wholesale & retail | 2021 |
| DB Direct Limited | Administrative & support | 2021 |
| DB Integrated Services Limited | Administrative & support | 2021 |
| Dbps Holdings Ltd | Financial services | 2016 |
| DC Change Management Ltd | Information & communication | 2017 |
| DC Development and Maintenance Services Ltd | Real estate | 2017 |
| DC Financial Planning Limited | Financial services | 2024 |
| Dcaf Ltd | Professional & scientific | 2019 |
| Dccore Holdings Limited | Financial services | 2023 |
| DCH Cleaning & Laundry Services Ltd | Other services | 2024 |
| DCN Cleaning Specialists & Co Ltd | Administrative & support | 2024 |
| DCR Enterprises Ltd | Hospitality | 2025 |
| DD Plumb IT Ltd | Construction | 2019 |
| Ddme Limited | Information & communication | 2005 |
| DDS EOT Limited | Administrative & support | 2026 |
| DE Services Ltd | Construction | 2025 |
| Dean Clough (Fearnleys) Limited | Real estate | 1972 |
| Dean Clough Limited | Real estate | 1982 |
| Dean Handley Builders & Plasterers Ltd | Construction | 2012 |