| Dentika Solutions Ltd | Professional & scientific | 2023 |
| Dentika Training Academy Ltd | Education | 2024 |
| Depart-Norm Ltd | Information & communication | 2024 |
| DEPLOY2.NET Limited | Professional & scientific | 2010 |
| Depthchartsports Limited | Information & communication | 2025 |
| Derbyshire Home Loans Limited | Administrative & support | 1991 |
| Dereli Visuals Ltd | Information & communication | 2017 |
| Derizo Infotech Solution Ltd | Professional & scientific | 2025 |
| Deryn Ltd | Agriculture & fishing | 2009 |
| Desibilla Limited | Hospitality | 2020 |
| Desify Ltd | Wholesale & retail | 2024 |
| Design Centre (Suffolk) Limited | Wholesale & retail | 2010 |
| Design Hairdressing Limited | Real estate | 1999 |
| Design Lighting Solutions Limited | Other services | 2009 |
| Designcare Ltd | Health & social care | 2018 |
| Designtech Innovations Ltd | Construction | 2023 |
| Dessert 4 YOU Limited | Hospitality | 2023 |
| Dessous Chics Limited | Wholesale & retail | 2004 |
| Dessymak Productions Limited | Information & communication | 2018 |
| Destage Limited | Real estate | 2022 |
| Destiny Mastery Ltd | Real estate | 2026 |
| Detailing Studio Ltd | Administrative & support | 2021 |
| Deurali Swindon Ltd | Hospitality | 2025 |
| Develop Business Group Ltd | Information & communication | 2019 |
| Development Planning and Design Services Group Limited | Professional & scientific | 1985 |
| Devenish Black Limited | Wholesale & retail | 2024 |
| Devis Beauty Ltd | Other services | 2022 |
| Devizes Control Systems Limited | Construction | 2003 |
| Devizes Kebab Van Ltd | Hospitality | 2025 |
| Devizes Marina Boat Sales Limited | Administrative & support | 2014 |
| Devizes Marina Village Limited | Administrative & support | 1997 |
| Devizes Road Practice Ltd | Health & social care | 2023 |
| Devlin Installations Limited | Construction | 2012 |
| Devoir Group Ltd | Information & communication | 2026 |
| Devon Maintenance Limited | Construction | 2011 |
| Devpeople Limited | Information & communication | 2021 |
| Dewell Mews (Swindon) Management Company Limited | Households | 1989 |
| Dewoll Brand Ltd | Hospitality | 2024 |
| Dewoll Stratco Limited | Professional & scientific | 2012 |
| Dexion Material Handling Limited | Manufacturing | 2003 |
| DFB Builders Limited | Construction | 2023 |
| Dfmtrans Ltd | Transport & logistics | 2020 |
| DFS Cleaning Company Ltd | Administrative & support | 2025 |
| DFS Recruitment Ltd | Transport & logistics | 2022 |
| DG Agility Ltd | Information & communication | 2023 |
| DG Hub (UK) Limited | Administrative & support | 2025 |
| DH CAD Services Limited | Professional & scientific | 2009 |
| DH Hunt Holdings Limited | Financial services | 2025 |
| Dhaliwal Services Swindon Ltd | Transport & logistics | 2026 |
| Dhaliwal Transport and Logistics Limited | Transport & logistics | 2026 |
| Dhanoa Enterprise Ltd | Wholesale & retail | 2021 |
| Dhareys Consulting Limited | Professional & scientific | 2025 |
| Dharme Company Limited | Health & social care | 2026 |
| Dhruvarjun Property Ltd | Real estate | 2023 |
| Diagnopath Limited | Health & social care | 2020 |
| Dialynx Performance Tuning Ltd | Manufacturing | 2020 |
| Diamini Imports Limited | Hospitality | 2019 |
| Diamond Energy Limited | Professional & scientific | 2006 |
| Diamond Pro-Cure Limited | Administrative & support | 2012 |
| Diamond Property Stays.Uk Ltd | Real estate | 2025 |
| Diamond Smiles Dental Centre Limited | Health & social care | 2011 |
| Diamond Support Home Ltd | Construction | 2020 |
| Dias Caterers Swindon Ltd | Hospitality | 2025 |
| Dias Plumbing & Heating Ltd. | Construction | 2026 |
| Dibba's Estate Agents Ltd | Real estate | 2022 |
| Dice Competitions Ltd | Arts & recreation | 2024 |
| Dice Mentoring Ltd | Education | 2026 |
| Dick Lovett (Avon) Limited | Wholesale & retail | 2016 |
| Dick Lovett (Bath) Limited | Wholesale & retail | 1999 |
| Dick Lovett (Bristol) Limited | Wholesale & retail | 1982 |
| Dick Lovett (Hungerford) Limited | Wholesale & retail | 1972 |
| Dick Lovett (Specialist Cars) Limited | Wholesale & retail | 1990 |
| Dick Lovett (SV) Limited | Wholesale & retail | 1985 |
| Dick Lovett (Swindon) Limited | Wholesale & retail | 1976 |
| Dick Lovett Automobile Limited | Wholesale & retail | 1987 |
| Dick Lovett Companies Limited | Wholesale & retail | 1973 |
| Dick Lovett Limited | Wholesale & retail | 1946 |
| Dick Lovett Sporting Limited | Wholesale & retail | 1993 |
| Dick Lovett Sports Cars Limited | Wholesale & retail | 1999 |
| Didarone IT Ltd | Information & communication | 2023 |
| Diferns Limited | Construction | 2023 |
| Digging Deeper Limited | Information & communication | 2010 |
| Digicore Cctv Ltd | Administrative & support | 2012 |
| Digicore Group Ltd | Administrative & support | 2012 |
| Digison Ltd | Information & communication | 2019 |
| Digital Dynamics Solutions Limited | Information & communication | 2018 |
| Digital Healthsense Ltd | Other services | 2016 |
| Digital Marketing Solutions Group Limited | Professional & scientific | 2025 |
| Digital Rise Media Limited | Professional & scientific | 2025 |
| Digital Service Works Ltd | Professional & scientific | 2023 |
| Digital Writes - Development & Publishing C.I.C. | Education | 2015 |
| Digitized Solutions Ltd | Extraterritorial | 2022 |
| Dilaksha Synergy Ltd | Wholesale & retail | 2018 |
| Dilbi Coffee UK Ltd | Manufacturing | 2026 |
| Dilksh Limited | Hospitality | 2024 |
| Dilkush Limited | Hospitality | 2019 |
| Dimatransport Ltd | Transport & logistics | 2023 |
| Dimensions Garage Doors (Swindon) Limited | Manufacturing | 2009 |
| Dimpos Healthcare Ltd | Health & social care | 2021 |
| Dinamyte Ltd | Wholesale & retail | 2025 |