| Donovan Property Investments Limited | Real estate | 2009 |
| Dont Start Records Limited | Information & communication | 2025 |
| Donvale Holdings Limited | Financial services | 1950 |
| Donya Properties Ltd | Real estate | 2023 |
| Doolan Properties Limited | Real estate | 2004 |
| Dooley Records Ltd. | Information & communication | 2019 |
| Doomsday Outlaw Ltd | Arts & recreation | 2023 |
| Doop Global Group of Companies Ltd | Wholesale & retail | 2024 |
| Door Division Limited | Households | 2013 |
| Door Furniture Direct Limited | Extraterritorial | 2021 |
| Door Rack Cafe Ltd | Hospitality | 2025 |
| DOOR2DOOR (SY) Ltd | Transport & logistics | 2024 |
| Doornet Ltd | Administrative & support | 2025 |
| Doors & Floors Galore Ltd | Wholesale & retail | 2020 |
| Doorway to Independence Ltd | Manufacturing | 2025 |
| Dopamining Ltd | Wholesale & retail | 2025 |
| DOR and TAN Limited | Manufacturing | 2015 |
| Dore & Totley Golf Club (the) Limited | Arts & recreation | 1928 |
| Dore & Totley Tennis Club Limited | Arts & recreation | 2008 |
| Dore Cafe Ltd | Hospitality | 2020 |
| Dore Construction Ltd | Administrative & support | 2014 |
| Dore Developments Ltd | Construction | 2026 |
| Dore Garden Offices Limited | Construction | 2014 |
| Dore Glen Management Limited | Households | 2016 |
| Dore Kids Club Limited | Other services | 2007 |
| Dore Masonic Hall Company Limited | Other services | 1951 |
| Dore Medical Ltd | Health & social care | 2014 |
| Dore Properties Ltd | Real estate | 2003 |
| Dore Property and Lettings Ltd | Real estate | 2016 |
| Dore Service Station Limited | Wholesale & retail | 2007 |
| Dore Trading Limited | Hospitality | 2015 |
| Dore Village Kids Limited | Health & social care | 2025 |
| Dorehouse Business Management Limited | Extraterritorial | 2006 |
| Doren Investment Ltd | Real estate | 2021 |
| Doreview Limited | Transport & logistics | 2019 |
| Dorin MD Transport Ltd | Transport & logistics | 2023 |
| Dorin Transport Limited | Transport & logistics | 2025 |
| Doris LEE Design Studio Limited | Professional & scientific | 2013 |
| Dormy House Bawtry Limited | Financial services | 2017 |
| Dornoch Baxter Limited | Professional & scientific | 2017 |
| Dorrell Flooring Limited | Construction | 1990 |
| Dorsal Properties Ltd | Real estate | 2025 |
| Doru Pizza Ltd | Transport & logistics | 2021 |
| Dorvic Engineering Co. Limited | Manufacturing | 1974 |
| DOS Amigos J.Y Ltd | Hospitality | 2023 |
| DOS Borges Ltd | Administrative & support | 2025 |
| Dosanjh Investments Limited | Construction | 2024 |
| Dosanjh Property Investment Ltd | Real estate | 2024 |
| Dose Wellness Ltd | Health & social care | 2025 |
| Dosky UK 2025 Limited | Hospitality | 2025 |
| DOT and Dash Consulting Ltd | Information & communication | 2024 |
| DOT DOT Studio Ltd | Professional & scientific | 2024 |
| DOT Pre-Media Ltd | Manufacturing | 2026 |
| DOT Retail Services Ltd | Wholesale & retail | 2022 |
| DOT Security Services Ltd | Administrative & support | 2023 |
| Dots Joined Events Limited | Administrative & support | 2019 |
| Dotstudiocreative Ltd | Professional & scientific | 2025 |
| Dotty and Velvet Ltd | Wholesale & retail | 2019 |
| Dotwo Games Ltd | Information & communication | 2025 |
| Double Bluff Ltd | Information & communication | 2024 |
| Double Dragon (YZ) Limited | Hospitality | 2019 |
| Double First Limited | Information & communication | 1998 |
| Double M Engineering Ltd | Construction | 2025 |
| Double Seven Events Limited | Other services | 2009 |
| Doublesure Home Improvements Ltd | Construction | 2019 |
| Dough Bites Four Limited | Hospitality | 2020 |
| Dough Bites One Limited | Hospitality | 2019 |
| Dough Bites Three Limited | Hospitality | 2020 |
| Dough Bites Two Limited | Hospitality | 2019 |
| Dough Truck Pizza Ltd | Hospitality | 2021 |
| Dough&Co Maldon Limited | Hospitality | 2022 |
| Dough&Co the Moor Limited | Hospitality | 2021 |
| Doughboy Group Limited | Manufacturing | 2019 |
| Dougiedoog Limited | Transport & logistics | 2026 |
| DOUVELLE19 Ltd | Arts & recreation | 2024 |
| Dove Cote House Limited | Administrative & support | 2024 |
| Dove Decor Limited | Construction | 2000 |
| Dove Management (Properties) Limited | Real estate | 2001 |
| Dove Management Services Limited | Extraterritorial | 2001 |
| Dove Properties and Estates Limited | Real estate | 2005 |
| Dove Recruitment Limited | Administrative & support | 2019 |
| Dovecote Kitchens Direct Limited | Manufacturing | 2020 |
| Dovedale Holdings Limited | Administrative & support | 2019 |
| Dover Anaesthetics Ltd | Health & social care | 2015 |
| Dovestone Construction Consultancy Limited | Professional & scientific | 2020 |
| Dovetail Antiques and Restorations Limited | Extraterritorial | 2004 |
| Dowbusz Development Ltd | Construction | 2019 |
| Dowbusz Education Ltd | Education | 2019 |
| Dowbusz Property Ltd | Real estate | 2017 |
| Dowdesdwellings Ltd | Real estate | 2024 |
| Dowie Events Management Limited | Professional & scientific | 2018 |
| DOWN2U Health and Wellbeing Ltd | Other services | 2022 |
| Downholme Properties Limited | Real estate | 2014 |
| Downing & Smith Developments Limited | Construction | 2020 |
| Downloaded UK Ltd | Arts & recreation | 2026 |
| Downton & Co Limited | Other services | 2015 |
| Downwind Ventures Ltd | Administrative & support | 2026 |
| Dowson Engineering Services Limited | Professional & scientific | 2024 |
| DOX Intelligent Solutions Ltd | Information & communication | 2024 |
| Doyen Tea Company Limited | Wholesale & retail | 2012 |