| Doctor Phone Limited | Wholesale & retail | 2016 |
| Doctor S Hasan Limited | Health & social care | 2014 |
| Doctor Saucy Ltd | Hospitality | 2025 |
| Doctor&Medics Limited | Health & social care | 2017 |
| Doctorhaq Ltd | Health & social care | 2026 |
| Doctors in Business Ltd | Professional & scientific | 2018 |
| Doctors MK Limited | Health & social care | 2024 |
| Doctorsky Ltd | Professional & scientific | 2026 |
| DODDJ1 Limited | Construction | 2023 |
| Dodo Publishing Company Limited | Information & communication | 2015 |
| DOE Foods Limited | Manufacturing | 2019 |
| Doeast Ltd | Wholesale & retail | 2024 |
| Dofe Adventure Limited | Education | 2024 |
| Dog & Partridge Leisure Limited | Hospitality | 2023 |
| Dog Academy Pro Ltd | Extraterritorial | 2025 |
| Dog Accessories Ltd | Extraterritorial | 2025 |
| Dog and Bone Communications PLC | Information & communication | 2019 |
| Dog Bowl Ltd | Hospitality | 2011 |
| Dog Box Enterprises Ltd | Wholesale & retail | 2025 |
| Dog Day Leisure Ltd | Administrative & support | 2013 |
| Dog Friendly Location International Limited | Information & communication | 2019 |
| Dog Hotel NW Limited | Other services | 2026 |
| Dog Meadows Limited | Other services | 2025 |
| Doga Community Manchester CIC | Other services | 2022 |
| Dogar Doner Kebab Ltd | Hospitality | 2026 |
| Doge Network Ltd | Information & communication | 2022 |
| Dogecore Ltd | Wholesale & retail | 2017 |
| Doggie Hotel Limited | Other services | 2023 |
| Doggo App Ltd | Professional & scientific | 2022 |
| Doggos World Ltd | Other services | 2024 |
| Doggy Daycare Trafford Park Ltd | Wholesale & retail | 2024 |
| Doggyvits Limited | Wholesale & retail | 2023 |
| Dogiolu Ltd | Hospitality | 2025 |
| Dogtra UK Ltd | Wholesale & retail | 2020 |
| DOH MCR Limited | Manufacturing | 2025 |
| Dohamart Ltd | Wholesale & retail | 2026 |
| Doherty & Parker Properties Limited | Real estate | 2025 |
| Doherty Enterprises Group Ltd | Financial services | 2021 |
| Doherty Evans & Stott Tailoring Ltd | Wholesale & retail | 2010 |
| Doherty Installations Ltd | Construction | 2026 |
| Doing Deals Daily Ltd | Professional & scientific | 2022 |
| Doiteasy Webhosting Ltd | Wholesale & retail | 2026 |
| Doja Group Limited | Professional & scientific | 2022 |
| Dojani Private Limited | Wholesale & retail | 2023 |
| DOK Mali Limited | Hospitality | 2016 |
| Dola Gate Ltd | Arts & recreation | 2025 |
| Dolamu Soft Tech Ltd | Information & communication | 2025 |
| Dolan Developments Ltd | Construction | 2022 |
| Dolan Estates Limited | Real estate | 2000 |
| Dolatom Cargo Logistic Services Limited | Transport & logistics | 2023 |
| Dolatom International Ltd | Wholesale & retail | 2020 |
| Dolce Studios Ltd | Arts & recreation | 2025 |
| Dolcehome Ltd | Wholesale & retail | 2021 |
| Dolgoed Limited | Professional & scientific | 2023 |
| Doll London Ltd | Wholesale & retail | 2013 |
| Doll Melts by Olivia Ltd | Wholesale & retail | 2025 |
| Doll Parts Limited | Other services | 2020 |
| Dollar Mall Limited | Wholesale & retail | 2024 |
| Dollbaby London Limited | Wholesale & retail | 2018 |
| Dollective Ltd | Wholesale & retail | 2022 |
| Dolled UP Academy Ltd | Education | 2025 |
| Dolled UP Dogs Grooming Parlour & Spa Limited | Other services | 2016 |
| Dollie's Detailing Ltd | Administrative & support | 2024 |
| Dollixar Ltd | Wholesale & retail | 2025 |
| Dolls Aesthetics Training Academy Limited | Education | 2019 |
| Dolls House Ltd | Manufacturing | 2026 |
| Dolls House Properties Limited | Real estate | 2025 |
| Dolly Beds Ltd | Other services | 2021 |
| Dolly Daydreams Beauty Limited | Other services | 2016 |
| Dolly Mixtures Limited | Wholesale & retail | 2026 |
| Dolman FM Ltd | Administrative & support | 2025 |
| Dolph Limited | Real estate | 2018 |
| Dolphin Aerospace Limited | Extraterritorial | 2025 |
| Dolphin Assets 2 Ltd | Households | 2024 |
| Dolphin Car Hire Ltd | Administrative & support | 2020 |
| Dolphin Finance Ltd | Other services | 2023 |
| Dolphin Gaming Limited | Extraterritorial | 1944 |
| Dolphin Nominees (UK) Limited | Extraterritorial | 2004 |
| Dolphin Seminars Limited | Other services | 2013 |
| Dolphin Services Ltd | Administrative & support | 2025 |
| Dolphin Tracks Limited | Wholesale & retail | 2018 |
| Dolu Ltd | Other services | 2022 |
| Domain Care Group Ltd | Health & social care | 2016 |
| Domain Care Limited | Health & social care | 2004 |
| Domain Care North West Ltd | Health & social care | 2014 |
| Domainate Ltd | Extraterritorial | 2023 |
| Domar Group Ltd | Real estate | 2025 |
| Domaswell Limited | Wholesale & retail | 2025 |
| Domat Ltd | Wholesale & retail | 2018 |
| Dombey Electrics Ltd | Construction | 2018 |
| Dombrov Bay Ltd | Real estate | 2024 |
| Dome Acquisition Limited | Wholesale & retail | 2025 |
| Dome Development (Croston Road) Limited | Construction | 2022 |
| Dome Development (Holmeswood) Limited | Construction | 2025 |
| Dome Development Group Limited | Construction | 2022 |
| Dome GT Holdings Limited | Financial services | 2022 |
| Dome KA Holdings Limited | Financial services | 2022 |
| Dome Project Management Consulting Limited | Construction | 2022 |
| Dome Properties NW Limited | Real estate | 2022 |
| Domefab Ltd | Wholesale & retail | 2011 |