| DNC Brickwork Ltd | Construction | 2021 |
| Dncg Car Wash Limited | Administrative & support | 2025 |
| DNG Bedford Properties (2) Ltd | Real estate | 2017 |
| DNG Bedford Properties Ltd | Construction | 2014 |
| DNG Cars Ltd | Wholesale & retail | 2025 |
| DNG Holdings Bedford Ltd | Financial services | 2017 |
| DNG Kidderminster Properties Ltd | Real estate | 2013 |
| DNG Milton Keynes Properties Ltd | Real estate | 2013 |
| DNG Seckloe House Ltd | Real estate | 2013 |
| DNP (Peterborough) Properties Ltd | Real estate | 2017 |
| DNP Hospitality Ltd | Hospitality | 2019 |
| Doberman 13 Ltd | Transport & logistics | 2016 |
| Dobleacu Ltd | Transport & logistics | 2025 |
| Dobson Digital Consulting Ltd | Information & communication | 2023 |
| Dock Holdings Ltd | Financial services | 2020 |
| Doctor in My Pocket Ltd | Health & social care | 2023 |
| Doctor Magnet Ltd | Construction | 2021 |
| Document Help Limited | Professional & scientific | 2026 |
| Document Scanning Solutions Limited | Professional & scientific | 2007 |
| Document Transports Limited | Hospitality | 1964 |
| Doddington Grange Management Company Limited | Households | 2016 |
| Dodoy Transport Ltd | Administrative & support | 2023 |
| Doelra & Co UK Ltd | Wholesale & retail | 2026 |
| Dog and DAD Homes Limited | Real estate | 2019 |
| Dog and Field Ltd | Administrative & support | 2014 |
| Dog and PIG Design Limited | Information & communication | 2016 |
| Dog Wash 360 Ltd | Other services | 2025 |
| Doingcoaching.Com Limited | Education | 2021 |
| Dolby Building Contractors Limited | Construction | 2018 |
| DOLCE28 Limited | Other services | 2024 |
| Dolea Care and Security Services Ltd | Administrative & support | 2014 |
| Dolive Ltd | Transport & logistics | 2019 |
| Dolma Technologies Limited | Information & communication | 2025 |
| DOM Paska Ltd | Transport & logistics | 2015 |
| DOM STA Property SPV Ltd | Real estate | 2020 |
| DOM Wells Personal Training Limited | Arts & recreation | 2021 |
| Domed Limited | Professional & scientific | 2023 |
| Domelec Electrical Services Ltd | Construction | 2014 |
| Domen-Trans Ltd | Transport & logistics | 2025 |
| Domik Ltd | Wholesale & retail | 2022 |
| Dominant Motors Ltd | Wholesale & retail | 2019 |
| Dominik S Ltd | Transport & logistics | 2014 |
| Dominion City Peterborough | Other services | 2022 |
| Dominion Connections Ltd | Health & social care | 2019 |
| Domke Ltd | Transport & logistics | 2023 |
| Domomin Ltd | Information & communication | 2020 |
| Domot Limited | Information & communication | 2021 |
| Domovon Ltd | Information & communication | 2026 |
| Domus Real Estate (Cambs) Ltd | Real estate | 2016 |
| DON Mateo Ltd | Transport & logistics | 2022 |
| DON Motors Limited | Wholesale & retail | 2024 |
| Don&Aiste Ltd | Transport & logistics | 2024 |
| Don's Alloy Refurb Limited | Wholesale & retail | 2023 |
| Donald's Garage Limited | Wholesale & retail | 1950 |
| Donalds Garage (Bury ST. Edmunds) Limited | Wholesale & retail | 2004 |
| Donalds Garage (Ipswich) Limited | Wholesale & retail | 2004 |
| Donaldson News & Convenient Store Ltd | Wholesale & retail | 2021 |
| Donat Catering Ltd | Hospitality | 2019 |
| DONE4U Ltd | Other services | 2023 |
| Doneta Ltd | Transport & logistics | 2015 |
| Donfim Services Ltd | Wholesale & retail | 2025 |
| Donna Stafford Consulting Limited | Administrative & support | 2006 |
| Donneeen Limited | Information & communication | 2018 |
| Donnington (Richards Road) Residents Company Limited | Households | 2004 |
| Donnington Residents Company Limited | Households | 2002 |
| Donovan Jenkin Limited | Construction | 2015 |
| Doodles Bookkeeping Ltd | Professional & scientific | 2023 |
| Door 1823 CIC | Professional & scientific | 2019 |
| Dor-Jan Property Group Ltd | Real estate | 2022 |
| Dor-Jan Trans Ltd | Transport & logistics | 2021 |
| Dor-Jan Windows & Doors Ltd | Manufacturing | 2018 |
| Doravisual Artworks Limited | Information & communication | 2021 |
| Dorelrs Ltd | Transport & logistics | 2025 |
| Doremi Studios Ltd | Information & communication | 2019 |
| Doreter Ltd | Construction | 2025 |
| Dori Cars Ltd | Wholesale & retail | 2026 |
| Dori Hand Car Wash Ltd | Wholesale & retail | 2014 |
| Dori Trans Ltd | Transport & logistics | 2011 |
| Dorim Ltd | Wholesale & retail | 2023 |
| Doris' Catering Services Limited | Hospitality | 2023 |
| Dormermere Limited | Manufacturing | 1981 |
| Dorres Ltd | Administrative & support | 2010 |
| Dosky Barber Limited | Other services | 2021 |
| DOT Green UK Limited | Construction | 2022 |
| Dotcomuk Ltd | Wholesale & retail | 2022 |
| Double Bubble Enterprises Ltd | Wholesale & retail | 2024 |
| Double Bubble Tea Ltd | Hospitality | 2018 |
| Double C Properties Limited | Real estate | 2015 |
| Double J Feeds Limited | Wholesale & retail | 2006 |
| Double R Joinery Ltd | Construction | 2023 |
| Douce Care Ltd | Health & social care | 2026 |
| Dovaman Media Ltd | Professional & scientific | 2021 |
| Dovaman Properties Ltd | Real estate | 2019 |
| Dove Partners LLP | | 2011 |
| Dovira Group Ltd | Administrative & support | 2026 |
| Dowman Digital Services Limited | Information & communication | 2020 |
| Dowman Labs Limited | Arts & recreation | 2024 |
| Downe Stone and Masonry Limited | Manufacturing | 2018 |
| Downpour Showers UK Ltd | Wholesale & retail | 2015 |
| Downtown Peri Peri Ltd | Hospitality | 2022 |