| Dominions Perfect Ltd | Health & social care | 2019 |
| Domino Alliance PC | | 2017 |
| Dominus Developments Kent Limited | Administrative & support | 2016 |
| Domisa Limited | Financial services | 2022 |
| Domos Invest Limited | Real estate | 2018 |
| Domosoft Ltd | Information & communication | 2025 |
| Domovox Ltd | Real estate | 2025 |
| Domus Flux Ltd | Households | 2026 |
| Domus Heat Ltd | Construction | 2025 |
| Domus International Solutions Limited | Real estate | 2011 |
| DON Hardware Ltd | Wholesale & retail | 2023 |
| DON Merch International Ltd | Wholesale & retail | 2025 |
| DON Skene Cycles Limited | Wholesale & retail | 2003 |
| DON Trader Ltd | Information & communication | 2016 |
| Don'T Knock Twice Limited | Information & communication | 2014 |
| Don'T Stop Property Ltd | Real estate | 2021 |
| Donakuls Ltd | Wholesale & retail | 2023 |
| Donald From Skye Ltd | Arts & recreation | 2018 |
| Donaliam Limited | Wholesale & retail | 2025 |
| Donarise Limited | Professional & scientific | 2019 |
| Donation Impact Ltd | Other services | 2025 |
| Donau Invest Ltd | Wholesale & retail | 2018 |
| Doncaster Office Space Limited | Professional & scientific | 2022 |
| Done-Fast Building Limited | Construction | 2006 |
| Dong HE MEI Technology Co., Limited | Extraterritorial | 2019 |
| Dong Jian Limited | Hospitality | 2015 |
| Dong Trading Ltd | Wholesale & retail | 2019 |
| Dongbeinianyumi Ltd | Agriculture & fishing | 2021 |
| Dongd Tang Trade Ltd | Wholesale & retail | 2025 |
| Dongfanghongsun Business Limited | Wholesale & retail | 2025 |
| Dongfeng International (UK) Logistics Co., Limited | Wholesale & retail | 2025 |
| Dongguan Swan Electronic Technology Co., Ltd | Manufacturing | 2020 |
| Dongyue Industrial Co., Ltd | Extraterritorial | 2021 |
| Donimero Recruitment Ltd | Public administration | 2020 |
| Donington Myers Ltd | Professional & scientific | 2025 |
| Donkey Vape Ltd | Wholesale & retail | 2025 |
| Donner Solutions Ltd | Wholesale & retail | 2021 |
| Donohn Sbort Ltd | Wholesale & retail | 2025 |
| Donson IT Consulting Ltd | Information & communication | 2014 |
| Donyshift Labs Ltd | Other services | 2025 |
| Doodle Dough Pizza Co Limited | Hospitality | 2024 |
| Doodlesdigi Ltd | Wholesale & retail | 2026 |
| Doodlewell Ltd | Information & communication | 2026 |
| Doofus Ideas Ltd | Information & communication | 2019 |
| Dooman MAY Ltd | Hospitality | 2018 |
| Doonfrando Ltd | Hospitality | 2022 |
| Doopee DOO Ltd | Information & communication | 2022 |
| Door Hub Ltd | Administrative & support | 2019 |
| Door Step Projects Ltd | Construction | 2024 |
| DOOR2DOOR Finance & Sales Ltd | Extraterritorial | 2024 |
| Doorgak Solutions Ltd | Administrative & support | 2022 |
| Doormate Hardware Limited | Manufacturing | 2023 |
| Doors Warehouse Wales Limited | Wholesale & retail | 2012 |
| Doorsafe Security Ltd | Administrative & support | 2018 |
| Dopedoc Ltd. | Manufacturing | 2024 |
| Doppelgänger Agency Ltd | Professional & scientific | 2018 |
| Doppler AC Limited | Information & communication | 2016 |
| Doran Tactical Innovations Ltd | Manufacturing | 2023 |
| Dorchester Art Galleries Limited | Wholesale & retail | 2016 |
| Dorchester Mobility Limited | Wholesale & retail | 2012 |
| Dorenell Windfarm Extension Limited | Energy | 2020 |
| Dorer Ltd | Wholesale & retail | 2026 |
| Doright Consulting Ltd | Professional & scientific | 2025 |
| Dorio Ltd | Wholesale & retail | 2025 |
| Dormant IWC Ltd | Other services | 2018 |
| Dormco SCP Limited | Administrative & support | 1997 |
| Dorne Project Limited | Professional & scientific | 2024 |
| Dorothys Cardiff Ltd | Hospitality | 2024 |
| Dorrs Ltd | Wholesale & retail | 2022 |
| Dorset Devons Ltd | Wholesale & retail | 2024 |
| Dorset DPF Doctor Limited | Construction | 2020 |
| Dorset in Limited | Information & communication | 2025 |
| Dorset Solutions Limited | | 2009 |
| Dose Apparels Ltd | Wholesale & retail | 2024 |
| Dosh Essentials Ltd | Other services | 2025 |
| Dosofet Ltd | Information & communication | 2025 |
| DOT One Group Ltd | Transport & logistics | 2025 |
| DOT Property Ltd | Real estate | 2018 |
| DOT Tech Group Ltd | Information & communication | 2019 |
| DOT Vaughan Limited | Real estate | 2019 |
| Dotely Ltd | Information & communication | 2025 |
| Dotframes Limited | Arts & recreation | 2020 |
| Dots Recruits Ltd | Administrative & support | 2018 |
| Dottie Pet Limited | Wholesale & retail | 2025 |
| Dotty Worldwide Entertainment Ltd | Hospitality | 2018 |
| Double Crown International Limited | Wholesale & retail | 2025 |
| Double KU Solutions Ltd | Health & social care | 2023 |
| Double Nine Holding Ltd | Hospitality | 2015 |
| Double O Global Limited | Arts & recreation | 2017 |
| Double T Enterprises Limited | Arts & recreation | 2017 |
| Double Tech International Limited | Extraterritorial | 2021 |
| Double U Consulting Services Limited | Professional & scientific | 2018 |
| Doubler Evans Holdings Limited | Financial services | 2026 |
| Doublet Holdings (Aberaeron) Limited | Real estate | 2018 |
| Doublet Holdings Limited | Real estate | 1985 |
| Doublet Property Services Limited | Extraterritorial | 1986 |
| Doug's Burgers Ltd | Hospitality | 2024 |
| Douglas & Davies Property Ltd | Real estate | 2022 |
| Douglas Co. Inc. Limited | Wholesale & retail | 2025 |
| Douglas Gregg (Swansea) LLP | | 2007 |