| D & a Hydraulics Limited | Manufacturing | 2011 |
| D & B Byproducts Limited | Wholesale & retail | 2019 |
| D & C Landscaping and Building Limited | Manufacturing | 2022 |
| D & D Painters and Decorators Limited | Construction | 2005 |
| D & D Powder Coating Limited | Manufacturing | 2021 |
| D & H Properties Limited | Real estate | 2002 |
| D & J Property Holdings Ltd | Real estate | 2025 |
| D & P Haulage Limited | Transport & logistics | 2003 |
| D & R Direct Limited | Wholesale & retail | 2009 |
| D & S Engineers Ltd | Manufacturing | 2007 |
| D & S Property (Hull) Limited | Real estate | 2009 |
| D a Maggs Limited | Transport & logistics | 1989 |
| D and H Haulage Ltd | Transport & logistics | 2019 |
| D and N Hire Ltd | Administrative & support | 2026 |
| D Anthony Mortgages Ltd | Financial services | 2024 |
| D B Auto Services (Hull) Limited | Wholesale & retail | 2023 |
| D Betts Ltd | Wholesale & retail | 2016 |
| D Blackwell Ltd | Manufacturing | 2023 |
| D Burns Property Ltd | Construction | 2017 |
| D C H Communications Limited | Information & communication | 2003 |
| D Cressie Access Limited | Construction | 2019 |
| D E Hunter Joinery Services Limited | Construction | 2018 |
| D E Marketing Limited | Other services | 2017 |
| D E Property Services Limited | Real estate | 2008 |
| D FIX UK Ltd | Health & social care | 2025 |
| D G Campbell Ltd | Construction | 2019 |
| D H Maintenance Services Ltd | Construction | 2016 |
| D L Turner Lifting Services Limited | Professional & scientific | 2018 |
| D Norris Trading Limited | Wholesale & retail | 2025 |
| D Parker Holdings Ltd | Financial services | 2025 |
| D Pazzo Hull Limited | Hospitality | 2024 |
| D R Walker Consulting Limited | Wholesale & retail | 2022 |
| D S P Rentals & Repairs Ltd | Manufacturing | 2025 |
| D S Parker (Road Freight) Ltd | Transport & logistics | 2025 |
| D Systems Ltd | Professional & scientific | 2014 |
| D Ward & SON Engineering Ltd | Manufacturing | 2011 |
| D&A Cleaning Hull Limited | Professional & scientific | 2018 |
| D&A Motors Ltd | Wholesale & retail | 2022 |
| D&B Elite Joinery Limited | Construction | 2026 |
| D&B Healthcare Solutions Ltd | Health & social care | 2022 |
| D&C Brickwork Ltd | Construction | 2025 |
| D&D Bars Limited | Hospitality | 2017 |
| D&D Market Limited | Wholesale & retail | 2019 |
| D&G Cafe Ltd | Hospitality | 2023 |
| D&G Trans Ltd | Transport & logistics | 2013 |
| D&J Pump Hire Ltd | Construction | 2025 |
| D&L Hire Limited | Administrative & support | 2025 |
| D&N Retreats Ltd | Hospitality | 2026 |
| D&R Direct Solutions Limited | Construction | 2019 |
| D-R Holdings (ENG) Ltd | Administrative & support | 2019 |
| D. & S.L. Holdings Limited | Transport & logistics | 2000 |
| D. & S.L. Storage Limited | Transport & logistics | 2000 |
| D. Edens Ltd | Education | 2009 |
| D.C Rikis Organisation Limited | Other services | 2025 |
| D.C. Plasterers (Yorkshire) Limited | Construction | 2006 |
| D.Davies Consultancy Services Ltd | Construction | 2026 |
| D.Davies Property Group Ltd | Real estate | 2024 |
| D.K.B Electrical Services Hull Ltd | Construction | 2025 |
| D.M.Ives Building Services Ltd | Construction | 2023 |
| D.R. Simpson (Chilled Foods) Limited | Arts & recreation | 1991 |
| D.S.P Forwarding (Yorkshire) Ltd | Transport & logistics | 2025 |
| D2 Property Ltd | Real estate | 2018 |
| D3 Office Group Limited | Wholesale & retail | 1998 |
| D3 Workplace Ltd | Financial services | 2024 |
| DA Shores Road Transport Ltd | Transport & logistics | 2014 |
| Daca Consulting Ltd | Information & communication | 2021 |
| Dade Ltd | Real estate | 2003 |
| Daedalus Construction Limited | Construction | 2016 |
| Daedalus NDT Ltd | Professional & scientific | 2022 |
| Daffodils Go Ltd | Wholesale & retail | 2023 |
| DAG Electrical Limited | Construction | 2019 |
| Daily Grind Hull Limited | Hospitality | 2026 |
| Daily Value Store Ltd | Wholesale & retail | 2025 |
| Dailynest Solutions Ltd | Wholesale & retail | 2024 |
| Daisy Freight Limited | Transport & logistics | 2019 |
| Daisy Fresh Cleaning Ltd | Administrative & support | 2025 |
| Daisyhill MOT Station Limited | Wholesale & retail | 2021 |
| Dale Leisure Supplies Holdings Limited | Manufacturing | 2024 |
| Dale Roofing Limited | Construction | 2010 |
| Dali Barber Limited | Other services | 2025 |
| Dalloway Partners Ltd | Professional & scientific | 2025 |
| Dalton C Limited | Other services | 2007 |
| Dalton Care & Support Limited | Health & social care | 2023 |
| Dalton Housing CIC | Real estate | 2022 |
| Dalton Properties (Hull) Limited | Real estate | 2017 |
| Dalton Street Car Sales Ltd | Wholesale & retail | 2019 |
| Dam-Mat Ltd | Hospitality | 2025 |
| Damascus Sweet 1 Ltd | Hospitality | 2024 |
| Dame Fashion Ltd | Wholesale & retail | 2025 |
| Dami-Med Services Ltd | Health & social care | 2022 |
| DAN Mccann Limited | Construction | 2022 |
| DAN Pearce Fitness Ltd | Arts & recreation | 2023 |
| DAN Pick Engineering Limited | Professional & scientific | 2012 |
| DAN Sims Joinery Services Ltd | Construction | 2012 |
| DAN Welburn Coaching Ltd | Other services | 2021 |
| DAN Welburn Properties Ltd | Real estate | 2022 |
| Dana Mobile Ltd | Other services | 2025 |
| Danby Property Lettings Limited | Real estate | 2018 |
| Danby's Electrical and GAS Ltd | Construction | 2015 |
| Dance in Company C.I.C. | Arts & recreation | 2023 |