| DJM Painting Services Ltd | Construction | 2024 |
| DJM Speed Ltd | Transport & logistics | 2014 |
| DJO Consultancy Ltd | Professional & scientific | 2006 |
| DJP Data Ltd | Information & communication | 2025 |
| DJT Barber Ltd | Other services | 2026 |
| DK Aesthetics Skin and Body Clinic Ltd | Other services | 2019 |
| DK Homes & Estates Ltd | Real estate | 2026 |
| DK Independent Social Worker Limited | Health & social care | 2009 |
| DK Rental Properties Ltd | Real estate | 2019 |
| DKA Consultancy Ltd | Professional & scientific | 2026 |
| Dkar Capital Limited | Real estate | 2024 |
| DKM & Sons Utilities Limited | Construction | 2025 |
| DKM 2020 Consulting Ltd | Professional & scientific | 2020 |
| Dknr Homes Ltd | Real estate | 2020 |
| Dkoh Properties Limited | Real estate | 2025 |
| Dkonstan Consulting Limited | Information & communication | 2013 |
| DKS Security Services Ltd | Administrative & support | 2022 |
| DLA Investments Ltd | Real estate | 2016 |
| DLL Groundworks Ltd | Construction | 2025 |
| DLM UK Holdings Ltd | Real estate | 2024 |
| DLM24 Limited | Hospitality | 2023 |
| DM Deliveries Limited | Transport & logistics | 2023 |
| DM Laundry Installations Ltd | Manufacturing | 2019 |
| DM Pro Logistics Ltd | Transport & logistics | 2022 |
| DM Procurement Management Limited | Professional & scientific | 2016 |
| DM Red Ltd | Construction | 2020 |
| DMC Weston Ltd | Construction | 2018 |
| Dmk-Dynamics Ltd | Professional & scientific | 2008 |
| DML Homes Ltd | Real estate | 2025 |
| DMR Licensed Solutions Limited | Professional & scientific | 2022 |
| Dmrr Retail Ltd | Wholesale & retail | 2023 |
| DMS Resolutions Limited | Professional & scientific | 2021 |
| DMT Studio Ltd | Wholesale & retail | 2026 |
| DMW Associates Ltd | Professional & scientific | 2019 |
| Dmzen Ltd | Information & communication | 2012 |
| DNA (1959) Limited | Administrative & support | 2019 |
| DND Car Sales Ltd | Other services | 2026 |
| Dnetuk Limited | Wholesale & retail | 2020 |
| DNH Creative Limited | Professional & scientific | 2024 |
| DNS Corporate Limited | Information & communication | 2019 |
| Dntech Global Ltd | Information & communication | 2025 |
| Dnvt Ltd | Transport & logistics | 2013 |
| DO Beach Limited | Professional & scientific | 2024 |
| DO NOT Disturb Media Limited | Information & communication | 2025 |
| Doaba Trucking Ltd | Transport & logistics | 2023 |
| Dobrinn Construction Ltd | Construction | 2022 |
| Docify Ltd | Information & communication | 2024 |
| Dockinet Ltd | Manufacturing | 2025 |
| Docklands Services Ltd | Construction | 2022 |
| Doctail Ltd | Wholesale & retail | 2024 |
| Doctor Bird Media CIC | Information & communication | 2024 |
| Docuflow Ltd | Information & communication | 2010 |
| Docxcanvas Technologies Ltd | Wholesale & retail | 2026 |
| Dog and Dragon Ltd | Manufacturing | 2025 |
| Dog Walkie Pet Services Ltd | Wholesale & retail | 2006 |
| Doggy Day Care / Play Centre Ltd | Agriculture & fishing | 2017 |
| Doherty & Simpson Enterprises Limited | Hospitality | 2022 |
| Doherty Property & Rentals Ltd | Households | 2026 |
| Dojo Mojo Ltd | Education | 2025 |
| Dojoy Discounts Ltd | Wholesale & retail | 2019 |
| Dokidokidoodles Ltd | Arts & recreation | 2020 |
| Dolans Distributions Ltd | Wholesale & retail | 2026 |
| Dolman Timber Products Limited | Professional & scientific | 2012 |
| Dolphin IT Ltd | Information & communication | 2017 |
| Dolrea Holdings Ltd | Real estate | 2024 |
| DOM Baker Design Ltd | Professional & scientific | 2015 |
| Domi Services Ltd | Transport & logistics | 2024 |
| Dominic Burns Limited | Information & communication | 2012 |
| Dominion Foods Ltd | Hospitality | 2026 |
| Dominion Health Ltd | Health & social care | 2021 |
| Domino's Pizza West Country Limited | Hospitality | 2012 |
| Dominus Sapients Ltd | Real estate | 2025 |
| DON Briscoe Ltd | Health & social care | 2025 |
| DON Reid Quality Management Ltd | Professional & scientific | 2013 |
| Don-Ing-Tan Limited | Other services | 2023 |
| Donald Optics Ltd | Professional & scientific | 2022 |
| Donasperfection Limited | Wholesale & retail | 2025 |
| Donatas B. Ltd | Information & communication | 2016 |
| Donatorii Transport Ltd | Transport & logistics | 2024 |
| Doniford Properties Limited | Construction | 2014 |
| Donington Desserts Limited | Hospitality | 2017 |
| Donington Group Limited | Financial services | 2025 |
| Donovan Newton Holdings Limited | Real estate | 2011 |
| Donovan Newton Limited | Professional & scientific | 2003 |
| Doodle Bakes Ltd | Manufacturing | 2020 |
| Doodle DO Day Nurseries Ltd | Education | 2012 |
| Doohan's Grab Hire Limited | Water & waste | 2007 |
| Doorwise Property Management Limited | Information & communication | 2026 |
| Dorchester Pets Ltd | Wholesale & retail | 2026 |
| Doree & Co Limited | Professional & scientific | 2019 |
| Dorians Solicitors Limited | Professional & scientific | 2010 |
| DOS Decorators Ltd | Construction | 2023 |
| DOS Properties Limited | Real estate | 2006 |
| Dosop Limited | Information & communication | 2005 |
| DOT25 Ltd | Administrative & support | 2024 |
| Dott Group Ltd | Financial services | 2025 |
| Dott Holding Ltd | Real estate | 2024 |
| Dotts Apparel Ltd | Wholesale & retail | 2020 |
| Dotts Fitness Limited | Arts & recreation | 2021 |
| Doug Heys GAS Engineer Limited | Construction | 2002 |