| Dooks Solutions Limited | Administrative & support | 2013 |
| Dool Property Ltd | Real estate | 2019 |
| Dool Urology Limited | Health & social care | 2019 |
| Dooley & Rostron Ltd | Manufacturing | 2023 |
| Dooley's Furniture Limited | Wholesale & retail | 2009 |
| Doolittle Pets & Groomers Ltd | Wholesale & retail | 2018 |
| Doonstan Limited | Wholesale & retail | 2011 |
| Door and Shutter Systems Limited | Construction | 2019 |
| Door Glass Limited | Manufacturing | 2012 |
| Door Republic A1 Ltd | Administrative & support | 2018 |
| Door Safe Fire Protection UK Ltd | Construction | 2026 |
| Door to Your Home (Investments) Limited | Real estate | 2023 |
| Door to Your Home Ltd | Real estate | 2020 |
| DOOR2DOORPROPERTY Ltd | Real estate | 2021 |
| Doors Vault Limited | Wholesale & retail | 2021 |
| DOORS2MANUAL Ltd | Wholesale & retail | 2021 |
| Doorsecure (NW) Limited | Financial services | 2010 |
| Doorstep Services Ltd | Other services | 2019 |
| Doorstep Sport Trading Ltd | Education | 2015 |
| Dootrix Ltd | Information & communication | 2011 |
| Dootson & Harrison Funeral Services Ltd | Other services | 2019 |
| Doozza Ltd | Wholesale & retail | 2013 |
| Dopeartdept Ltd | Arts & recreation | 2025 |
| Dopefrica Ltd | Information & communication | 2020 |
| Dophovar Ltd | Transport & logistics | 2019 |
| DOR Yeshorim | Other services | 2017 |
| Dora Modern Lighting Company Ltd | Wholesale & retail | 2025 |
| Doran Formcrete Ltd | Construction | 2021 |
| Dorbiere Limited | Hospitality | 1979 |
| Dorcas Health Care Ltd | Education | 2023 |
| Dorcas Home Care Ltd | Health & social care | 2022 |
| Dorchesteruk Ltd | Hospitality | 2023 |
| Dore FX Ltd | Administrative & support | 2021 |
| Doreen Healthcare Ltd | Health & social care | 2024 |
| Dores Joinery Services Ltd | Construction | 2007 |
| Dormant Alexandra Park Limited | Education | 1988 |
| Dormex Containers Limited | Wholesale & retail | 1993 |
| Dormouse Chocolates Ltd | Manufacturing | 2017 |
| Dorothy Perkins Online Limited | Wholesale & retail | 2021 |
| Doroub AL Majd for Investment Ltd | Other services | 2024 |
| Dorrigo Holdings Limited | Financial services | 2023 |
| Dorrigo Limited | Wholesale & retail | 2005 |
| Dorrington Property Company Limited | Real estate | 2005 |
| Dorsley Developments Ltd | Construction | 2016 |
| Dorward Associates Group Ltd | Administrative & support | 2018 |
| DOS Bar Limited | Hospitality | 2026 |
| Dosa&Beyond Ltd | Hospitality | 2025 |
| Dosar Limited | Real estate | 2025 |
| Dose Cafe Ltd | Hospitality | 2025 |
| Dose Delivered Ltd | Wholesale & retail | 2019 |
| Dose Tech Ltd | Professional & scientific | 2021 |
| Dosei Ltd | Information & communication | 2021 |
| Dost Land Printers Ltd | Manufacturing | 2025 |
| Dostrausa Ltd | Wholesale & retail | 2025 |
| DOT Care Limited | Health & social care | 2022 |
| DOT DOT DOT Investments Limited | Financial services | 2025 |
| DOT Hospitality Ltd | Hospitality | 2021 |
| DOT Lighting Limited | Manufacturing | 2006 |
| DOT Material Trade Ltd | Wholesale & retail | 2023 |
| DOT One Cars Limited | Wholesale & retail | 2025 |
| DOT Pics Limited | Manufacturing | 2001 |
| DOT Signs & Print Ltd | Manufacturing | 2013 |
| DOT to DOT Systems Limited | Information & communication | 2013 |
| DOT Vape Limited | Wholesale & retail | 2020 |
| DOT24 Limited | Transport & logistics | 2016 |
| DOT90 Ltd | Information & communication | 2025 |
| Dotica Supplies Ltd | Wholesale & retail | 2025 |
| Dotimpact Ltd | Other services | 2021 |
| Dotjuice Ltd | Real estate | 2023 |
| Doto Films Ltd | Information & communication | 2017 |
| Dotsimple Consulting Ltd | Information & communication | 2021 |
| Dotte Ltd | Wholesale & retail | 2020 |
| Dottie and Co. Ventures Ltd | Manufacturing | 2026 |
| Dottie Hill Homes Ltd | Real estate | 2026 |
| Dotto Studio Limited | Professional & scientific | 2017 |
| DOU Group Limited | Construction | 2024 |
| DOU Living Limited | Real estate | 2022 |
| Double a Rentals Ltd | Real estate | 2022 |
| Double Clump Translators Ltd | Professional & scientific | 2022 |
| Double Dragon Technology Limited | Information & communication | 2021 |
| Double Dunt Records Ltd | Arts & recreation | 2022 |
| Double K Builder Ltd | Construction | 2025 |
| Double Penny Ltd | Professional & scientific | 2023 |
| Double R Digital Ltd | Information & communication | 2025 |
| Double R. WEI Ltd | Wholesale & retail | 2026 |
| Double S Medics Ltd | Health & social care | 2025 |
| Double SIX Lets Ltd | Real estate | 2024 |
| Double X Property Limited | Real estate | 2025 |
| Double Zero Pizzeria Ltd | Hospitality | 2019 |
| Doubled Dwellings Ltd | Real estate | 2024 |
| Doubled Group Limited | Extraterritorial | 2016 |
| Doubledee Figures Limited | Information & communication | 2025 |
| Doublesec Limited | Information & communication | 2023 |
| Doublestruck Limited | Information & communication | 1989 |
| Doubletex Leathers (Exports) Ltd | Wholesale & retail | 2018 |
| Doubletex Leathers Limited | Wholesale & retail | 1976 |
| Doubletex Trading Limited | Manufacturing | 1978 |
| Doublewoods Supplies & Interiors Trading Ltd | Construction | 2025 |
| Doublezero Services Ltd | Administrative & support | 2025 |
| Douds Music Law Ltd | Professional & scientific | 2017 |