| Doktech Limited | Information & communication | 2008 |
| Dolce Bellezza Beauty and Spa Limited | Other services | 2025 |
| Dolce Desserts Franchise Ltd | Professional & scientific | 2022 |
| Dolce Desserts Ltd | Hospitality | 2018 |
| Dolce Developments Ltd | Construction | 2025 |
| Dolce LA Dolce Limited | Manufacturing | 2017 |
| Dolce N Gelato Ltd | Hospitality | 2019 |
| Dolce Valentina Ltd | Real estate | 2013 |
| Dolce Visa Advisory Limited | Information & communication | 2024 |
| Dolek Limited | Transport & logistics | 2026 |
| Doli Bridal Birmingham Limited | Wholesale & retail | 2024 |
| Dollhouse After Dark Ltd | Information & communication | 2023 |
| Dollhouse Photography Studios Ltd | Professional & scientific | 2023 |
| Dollhouse Tours Ltd | Professional & scientific | 2022 |
| Dollman Motor Group Ltd | Wholesale & retail | 2025 |
| Dollman Street Commercial Repairs Limited | Transport & logistics | 2003 |
| Dollop Ltd | Wholesale & retail | 2026 |
| Dolly Lush London Ltd | Wholesale & retail | 2021 |
| Dollypartydelight Limited | Hospitality | 2015 |
| Dolman Capital Limited | Administrative & support | 2026 |
| Dolmans Garage Ltd | Wholesale & retail | 2019 |
| Dolphin AG Ltd | Hospitality | 2024 |
| Dolphin AI International Co., Ltd | Wholesale & retail | 2024 |
| Dolphin Apsley Limited | Hospitality | 2017 |
| Dolphin Business Solutions Limited | Professional & scientific | 2017 |
| Dolphin Furniture Ltd | Wholesale & retail | 2025 |
| Dolphin Lifts Midlands Limited | Manufacturing | 2007 |
| Dolphin Media & Design (London) Limited | Information & communication | 2015 |
| Dolphin Orlando Limited | Health & social care | 2024 |
| Dolphin TS Ltd | Hospitality | 2025 |
| Dolsmedia Ltd | Professional & scientific | 2025 |
| DOM & BAL Property Ltd | Real estate | 2026 |
| DOM Krasota Ltd | Wholesale & retail | 2025 |
| DOM Transsport UK Ltd | Transport & logistics | 2024 |
| Dom's FIX Ltd | Construction | 2026 |
| Doma Aesthetics Ltd | Other services | 2023 |
| Domant Ltd | Transport & logistics | 2018 |
| Domaris Housing Group Ltd | Real estate | 2026 |
| Domas Solis Limited | Real estate | 2025 |
| Dombi Limited | Wholesale & retail | 2024 |
| Dome Leisure C.I.C. | Administrative & support | 2023 |
| Dome Leisure Group Ltd | Administrative & support | 2025 |
| Dome Nuts Limited | Manufacturing | 1988 |
| Dome Padel Ltd | Education | 2024 |
| Domestic & Industrial Limited | Wholesale & retail | 1997 |
| Domestic and Commercial Local Traders Limited | Water & waste | 2024 |
| Domestic Appliance City Ltd | Wholesale & retail | 2017 |
| Domestic Eco Craft Ltd | Professional & scientific | 2025 |
| Domestic Repair Solutions Ltd | Manufacturing | 2024 |
| Domestica (UK) Ltd | Wholesale & retail | 2005 |
| Domestica Service Limited | Manufacturing | 2011 |
| Domestik Appliances Ltd | Other services | 2017 |
| Domicil Mietgesellschaft Limited | Administrative & support | 2004 |
| Domiciliary EYE Care Ltd | Wholesale & retail | 2023 |
| DOMIN8 Academy Ltd | Arts & recreation | 2024 |
| Domination Limited | Other services | 2012 |
| Dominic Global Transport Ltd | Transport & logistics | 2025 |
| Dominic Moseley Limited | Hospitality | 2025 |
| Dominic Power Ltd | Health & social care | 2018 |
| Dominic's Haulage Ltd | Transport & logistics | 2017 |
| Dominion Solicitors Practice Limited | Professional & scientific | 2024 |
| Domino Global UK Limited | Wholesale & retail | 2019 |
| Dominus Terra Ltd | Wholesale & retail | 2023 |
| Domir Ltd | Hospitality | 2025 |
| Domnica Decorating Ltd | Construction | 2019 |
| Domo Pizza Ltd | Hospitality | 2018 |
| Dompsale Ltd | Wholesale & retail | 2022 |
| Domta Limited | Water & waste | 2023 |
| Domum Aesthetics Ltd | Health & social care | 2024 |
| Domus Asset Management Ltd | Real estate | 2025 |
| Domus CLK CIC | Hospitality | 2024 |
| Domus Group of Companies Limited | Financial services | 2012 |
| Domus Nostra Partners Ltd | Real estate | 2025 |
| Domus Regis Ltd | Real estate | 2026 |
| Domus Tiles Limited | Other services | 1964 |
| Domus Venatoris Ltd | Hospitality | 2025 |
| DON Birria Limited | Hospitality | 2026 |
| DON LE Ltd | Administrative & support | 2024 |
| DON MAC UK Limited | Manufacturing | 2026 |
| DON Richie Recording Production Ltd | Wholesale & retail | 2018 |
| DON Trimming Company Limited(The) | Manufacturing | 1960 |
| Don'T Give UP CIC | Administrative & support | 2025 |
| Don'T Panic Services Limited | Other services | 2006 |
| Don'T Rattle the Snake Ltd | Professional & scientific | 2015 |
| Don-Clem Technology Limited | Wholesale & retail | 2023 |
| Dona Limited | Professional & scientific | 2026 |
| Donald Steel Public Relations London Limited | Professional & scientific | 2011 |
| Donate 1 Create 1 CIC | Education | 2019 |
| Donation Boxes.Co.Uk Limited | Manufacturing | 2007 |
| Donation Limited | Other services | 2025 |
| Donationuk Limited | Other services | 2013 |
| Donavan Hepburn Limited | Arts & recreation | 2023 |
| Dondan Ltd | Extraterritorial | 2019 |
| Done by Desire (DBD) Ltd | Transport & logistics | 2026 |
| Done Right PUB Company Limited | Hospitality | 2019 |
| Donerci Ltd | Hospitality | 2025 |
| Dong Fang Hong Food Limited | Hospitality | 2023 |
| Dong GAN Hair Limited | Other services | 2019 |
| Dongyang Trading Limited | Administrative & support | 2014 |
| Donkcare Ltd | Wholesale & retail | 2025 |