| CW Accounting Limited | Professional & scientific | 2003 |
| Cyberbettv Limited | Information & communication | 2013 |
| D & a Installations Ltd | Construction | 2025 |
| D & D Drylining Developments Limited | Construction | 2015 |
| D C Home Improvements Ltd | Construction | 2017 |
| D F Plant Services Ltd | Manufacturing | 2019 |
| D Gucio Ltd | Transport & logistics | 2021 |
| D Mills Plumbing Services Ltd | Construction | 2002 |
| D P Detailing Ltd | Administrative & support | 2021 |
| D R T Designs Ltd | Construction | 2017 |
| D&A Install Services Limited | Construction | 2021 |
| D'Breeds Ltd | Transport & logistics | 2025 |
| D- RIG Ltd | Construction | 2025 |
| D.Jarrold Ltd | Construction | 2026 |
| D.R. Maintenance Ltd | Construction | 2019 |
| D220 Ltd | Real estate | 2016 |
| Daedalus Designs Ltd | Professional & scientific | 2023 |
| Daedalus Products Ltd | Wholesale & retail | 2023 |
| Dall Cleaning Company Limited | Administrative & support | 2019 |
| Danebury Court RTM Company Ltd | Households | 2018 |
| Daniel Davies Engineering Consultancy Ltd | Construction | 2022 |
| Daniel Reekie Limited | Construction | 2017 |
| Dapper Home Repairs Ltd | Construction | 2025 |
| Darby Roberts Ltd | Professional & scientific | 2023 |
| Darras Inverness Ltd | Wholesale & retail | 2026 |
| Dash & COX News Limited | Wholesale & retail | 2011 |
| Dave Coles Garage Gosport Ltd | Wholesale & retail | 2006 |
| Dave Hughes Limited | Information & communication | 2014 |
| Dave Sayer Ltd | Manufacturing | 2014 |
| David Kemp Ltd | Construction | 2018 |
| David Sharp Digitising Limited | Professional & scientific | 2018 |
| David Sharp International Limited | Professional & scientific | 2023 |
| David Sharp Limited | Wholesale & retail | 2006 |
| Daytrip-Uk Ltd | Transport & logistics | 2024 |
| Daze Entertainment Limited | Arts & recreation | 2013 |
| DBH Plastering Services Ltd | Construction | 2019 |
| Deacon's Property Consultants Ltd | Professional & scientific | 2016 |
| Dean Peacock Driving Ltd | Transport & logistics | 2026 |
| Deane Interior Solutions Limited | Manufacturing | 2001 |
| Deershill Engineering Limited | Professional & scientific | 2003 |
| Delalim Limited | Hospitality | 2025 |
| Delaney's Ristorante Limited | Hospitality | 2025 |
| Delotas Limited | Administrative & support | 2016 |
| Delta Daisy Ltd | Health & social care | 2019 |
| Denil Limited | Other services | 2016 |
| Desk Study Limited | Professional & scientific | 2021 |
| DGW Airframe Limited | Financial services | 2026 |
| DHE Hampshire Limited | Manufacturing | 2021 |
| Diamond Details Ltd | Administrative & support | 2023 |
| Diamond Environment and Water Ltd | Professional & scientific | 2020 |
| Diet MUM Repeat Limited | Health & social care | 2022 |
| Digital Leap Consulting Limited | Information & communication | 2024 |
| Digitel Limited | Information & communication | 1987 |
| Dimcos Services Ltd | Transport & logistics | 2024 |
| Direct Marketing Media Ltd | Professional & scientific | 2022 |
| Disgu Limited | Information & communication | 2026 |
| Dispatch Companion Limited | Transport & logistics | 2024 |
| DJF1 Limited | Real estate | 2025 |
| DJK Brickworks Limited | Construction | 2023 |
| DK Lecs Limited | Construction | 2009 |
| Dk-Servicesuk Ltd | Construction | 2024 |
| DLH Project Management Ltd | Professional & scientific | 2025 |
| DNA Vintage Ltd | Wholesale & retail | 2025 |
| DNG Solutions Ltd | Professional & scientific | 2024 |
| Dochia Properties Limited | Real estate | 2024 |
| Dointhedo Boat Hire Limited | Transport & logistics | 2017 |
| Dolly's Vintage Tea Rooms Limited | Hospitality | 2025 |
| Domestic Energies Ltd | Professional & scientific | 2013 |
| Double D Services Ltd | Construction | 2025 |
| Double Maxim Beer Company Limited | Manufacturing | 1999 |
| Dowdell Electrical Services Ltd | Construction | 2022 |
| DPM Home Improvements Ltd | Construction | 2025 |
| DR Tanya Griffiths Ltd | Health & social care | 2015 |
| Drake Court Management Ltd | Real estate | 2000 |
| Draw Property Investments Limited | Real estate | 2023 |
| Dream Dance Collective LLP | | 2025 |
| Dreamfield Construction Limited | Real estate | 2025 |
| Dreamfield Developments Ltd | Construction | 2019 |
| Dreamfield Lettings Ltd | Real estate | 2019 |
| Drywater Developments Limited | Real estate | 1999 |
| Drywater Ltd | Information & communication | 2001 |
| DS Equine Ltd | Agriculture & fishing | 2014 |
| DS Innovate Ltd | Professional & scientific | 2026 |
| Dskm Group Ltd | Information & communication | 2024 |
| DT Food and Beverages Ltd | Hospitality | 2026 |
| DT Space Technology Limited | Professional & scientific | 2017 |
| Dumbaeffums Ltd | Health & social care | 2023 |
| DVF Property Ltd | Real estate | 2024 |
| DW Infra Solutions Limited | Professional & scientific | 2025 |
| DXN Associates Limited | Extraterritorial | 2006 |
| DXN Building Solutions Limited | Construction | 2015 |
| Dynamic Laser Solutions Limited | Professional & scientific | 2009 |
| Dynamics 365 Development Ltd | Information & communication | 2024 |
| Dynamite Collectables Limited | Wholesale & retail | 2026 |
| E J Goodall Master Thatcher Limited | Construction | 2011 |
| E P Property Developers Limited | Real estate | 2005 |
| E&M Cleaning Services Ltd | Administrative & support | 2025 |
| Earthlink Express Ltd | Transport & logistics | 2023 |
| Easol Limited | Information & communication | 2020 |
| East Stour Trading Ltd | Wholesale & retail | 2019 |