| DIP Creative Limited | Professional & scientific | 2014 |
| Dipole Consulting Limited | Administrative & support | 2013 |
| Direct Asset Finance (Bristol) Limited | Financial services | 2012 |
| Direct Asset Finance Limited | Financial services | 2007 |
| DIRECT2COMPENSATION Limited | Professional & scientific | 2015 |
| Disability Sports Channel Limited | Manufacturing | 2023 |
| Discover AYA Ltd | Other services | 2025 |
| Discovery Education Europe Group Limited | Information & communication | 2000 |
| Discovery Education Europe Limited | Information & communication | 1996 |
| Disea(Uk) Company Ltd | Professional & scientific | 2022 |
| Disgruntled Gorilla Enterprises Ltd | Wholesale & retail | 2023 |
| Divine Healthcare Business Solutions Limited | Education | 2013 |
| DIY Garden Homes Ltd | Wholesale & retail | 2024 |
| Dizix Studios Limited | Information & communication | 2025 |
| DJ Hare Holdings Limited | Financial services | 2020 |
| DJ Wilson Associates Ltd | Professional & scientific | 2009 |
| DJF Capital Ltd | Professional & scientific | 2021 |
| DJF Hold Co Ltd | Financial services | 2021 |
| DJR Training Ltd | Professional & scientific | 2012 |
| Djrd Limited | Professional & scientific | 2024 |
| DK Plumbing & Heating Limited | Construction | 2007 |
| Dkvellia Limited | Other services | 2026 |
| DL Fire Security Electrical Ltd | Construction | 2025 |
| DLS Advisors Limited | Professional & scientific | 2019 |
| Dlux Smiles Ltd | Health & social care | 2019 |
| DM Electronics Design Ltd | Professional & scientific | 2012 |
| Dmcd Limited | Professional & scientific | 2012 |
| Dmkts Ltd | Professional & scientific | 2026 |
| DMP Consulting Limited | Professional & scientific | 2001 |
| DMS Mortgage Limited | Financial services | 2014 |
| DNA Photography in Bath Ltd | Professional & scientific | 2024 |
| DNB Property Consultants Ltd | Real estate | 2024 |
| DO Good Things Limited | Professional & scientific | 2010 |
| DO I Need a HAT Ltd | Professional & scientific | 2004 |
| Docherty Home Limited | Wholesale & retail | 2024 |
| Dockcroft Limited | Real estate | 1990 |
| Dockmasters House (Portishead) Management Company Limited | Households | 2006 |
| Dockoffice Limited | Professional & scientific | 2015 |
| Docmail Ltd | Extraterritorial | 1987 |
| Doctor Alex Ltd | Education | 2024 |
| Doctor GAS Limited | Other services | 2021 |
| Doctor Joshua Ltd | Health & social care | 2013 |
| Doctor Words Ltd | Health & social care | 2016 |
| Doggy Doos Limited | Agriculture & fishing | 2023 |
| Doherty Builders (Tedd) Limited | Construction | 2003 |
| Dollop Foods Ltd | Manufacturing | 2026 |
| Dolly TUB (Bath) Limited | Other services | 2018 |
| Domane Ltd | Real estate | 2025 |
| Domodo Ltd | Financial services | 2011 |
| Dood Eyewear Ltd | Wholesale & retail | 2022 |
| Doppelganger Productions | Arts & recreation | 2012 |
| Dora Larsen Limited | Manufacturing | 2015 |
| Dorian Bath Ltd | Hospitality | 2017 |
| Dorian Grey Limited | Hospitality | 2011 |
| Doric Property Ltd | Real estate | 2024 |
| Doring Ltd | Information & communication | 2021 |
| Dormiveglia Limited | Information & communication | 2021 |
| Dorothy Coleborn School of Dancing Ltd | Arts & recreation | 2022 |
| Dorset Electrical & Fire Alarms Limited | Construction | 2006 |
| Dorset Fire Sprinkler Systems Ltd | Construction | 2010 |
| Dorset Sparky Ltd | Construction | 2014 |
| Dorset Tiling and Renovations Ltd | Construction | 2023 |
| DOT DOT DOT Group Ltd | Professional & scientific | 2017 |
| DOT Project Limited | Professional & scientific | 2020 |
| DOT Software Limited | Information & communication | 1997 |
| Double Diamond Delivery Limited | Information & communication | 2021 |
| Double Diamond Recruitment Limited | Administrative & support | 2024 |
| Dough Co Consulting Limited | Administrative & support | 2005 |
| Dover Solar Limited | Professional & scientific | 2023 |
| Dowling & Co Fittings Limited | Construction | 2023 |
| Dprs Finance Limited | Financial services | 2008 |
| DPS Infotech Limited | Information & communication | 2017 |
| DR Claire Pugh Ltd | Public administration | 2024 |
| DR J P Nolan Ltd | Health & social care | 2012 |
| DR JC Viljoen Ltd | Professional & scientific | 2025 |
| DR Josie Dental and Aesthetics Limited | Health & social care | 2023 |
| DR Nicholas Swale Limited | Health & social care | 2015 |
| DR Rosanna Frost Limited | Health & social care | 2020 |
| DR Skin Aesthetics LLP | | 2020 |
| DR. Alex Concorde Ltd | Health & social care | 2001 |
| DR. Fox's Ltd | Real estate | 2003 |
| DR. Podcast Ltd | Education | 2008 |
| Draco Dorchester Limited | Hospitality | 2015 |
| Draco Property Limited | Administrative & support | 2005 |
| Dragonfly Consulting Limited | Information & communication | 2011 |
| Drakes Property Solutions Ltd | Hospitality | 2022 |
| Draper Construction and Renovation Limited | Construction | 2023 |
| Drax Enterprises Limited | Real estate | 2019 |
| Drax Estates Limited | Real estate | 2004 |
| Dray House Consultants Limited | Professional & scientific | 2007 |
| Draycott Court (Bath) Limited | Households | 1976 |
| Dreamball Limited | Real estate | 2002 |
| Drewett Developments Ltd | Real estate | 2020 |
| Drey Properties Ltd | Real estate | 2019 |
| Drift Energy Ltd | Energy | 2021 |
| Driftwood Productions Limited | Information & communication | 2010 |
| Drilltex GB Ltd | Wholesale & retail | 2013 |
| Drive Consulting Ltd | Professional & scientific | 2023 |
| Drop the MIC Ltd. | Arts & recreation | 2016 |
| Drop the MOP Ltd | Construction | 2017 |