| Del-South Limited | Transport & logistics | 2025 |
| Dela REA Limited | Health & social care | 2017 |
| Delafonte Limited | Information & communication | 2018 |
| Delair Limited | Wholesale & retail | 2021 |
| Delancor Group Services Limited | Construction | 2018 |
| Delaney Electrical Contracts Limited | Construction | 2017 |
| Delaval Limited | Wholesale & retail | 1985 |
| Delchester Property Ltd | Real estate | 2018 |
| Dele Property Group Limited | Real estate | 2026 |
| Delesate Ltd | Other services | 2025 |
| Deli Fuego Limited | Hospitality | 2015 |
| Deliberately Boring Limited | Information & communication | 2026 |
| Delicio's of South Wales Limited | Hospitality | 2016 |
| Delicious Circle Ltd | Wholesale & retail | 2023 |
| Delicious Easy Foods Ltd | Wholesale & retail | 2024 |
| Delight Care and Support Services Limited | Health & social care | 2020 |
| Delight Home Care Services Ltd | Administrative & support | 2017 |
| Delight Ventures Ltd | Administrative & support | 2020 |
| Delikipos Hairdressing Ltd | Administrative & support | 2016 |
| Delio Ltd | Information & communication | 2014 |
| Delivago Ltd | Construction | 2022 |
| Deliver Daily Ltd | Transport & logistics | 2017 |
| Deliver HR Consulting Ltd | Professional & scientific | 2019 |
| Deliver-E Ltd | Transport & logistics | 2020 |
| Deliverbuzz Ltd | Transport & logistics | 2019 |
| Deliverize Ltd | Transport & logistics | 2023 |
| Delivery Operations Ltd | Professional & scientific | 2019 |
| Delivery Star Ltd | Wholesale & retail | 2021 |
| Delivision Limited | Hospitality | 2018 |
| Delivrme Limited | Transport & logistics | 2018 |
| Dellmead Limited | Health & social care | 2023 |
| Dello Delande Ltd | Wholesale & retail | 2023 |
| Delloydmusic Ltd | Arts & recreation | 2013 |
| Delor Concept Limited | Other services | 2018 |
| Delor Resources Limited | Administrative & support | 2013 |
| Delsya Ltd | Wholesale & retail | 2025 |
| Delt Kitchen Ltd | Hospitality | 2021 |
| Delta 32 Ltd | Information & communication | 2023 |
| Delta Allaince PC | | 2017 |
| Delta Construction South West Ltd | Construction | 2019 |
| Delta Digital Solutions Ltd | Information & communication | 2024 |
| Delta Electric Limited | Construction | 2023 |
| Delta Green Investments Ltd | Manufacturing | 2021 |
| Delta One Projects Limited | Professional & scientific | 2023 |
| Delta Pictures Ltd | Information & communication | 2020 |
| Delta Planning Limited | Construction | 2008 |
| Delta Platform Limited | Construction | 2017 |
| Delta Prestige Security Solutions Limited | Administrative & support | 2019 |
| Delta Prime AI Solutions Ltd | Wholesale & retail | 2026 |
| Delta Projects & Commerce Consultancy Ltd | Professional & scientific | 2018 |
| Delta Strength Ltd | Arts & recreation | 2025 |
| Delta Trade International Limited | Wholesale & retail | 1990 |
| Delta-Avory (UK) Ltd. | Financial services | 2015 |
| Delta-T Technovations Ltd | Professional & scientific | 2020 |
| Deltahedron Ltd | Administrative & support | 2016 |
| Deltanostics Limited | Administrative & support | 2018 |
| Deltapex Limited | Wholesale & retail | 2025 |
| Deltawaresolutions Limited | Information & communication | 2024 |
| Delton Digital Limited | Professional & scientific | 2016 |
| Delton Holdings Limited | Financial services | 2019 |
| Delux Cars Limited | Transport & logistics | 2014 |
| Deluxe Ecommerce Limited | Information & communication | 2023 |
| Deluxe Glow Ltd | Other services | 2025 |
| Deluxe Marble Ltd | Manufacturing | 2022 |
| Deluxe Nails Cardiff Ltd | Other services | 2023 |
| Delvane Ltd | Wholesale & retail | 2025 |
| Delyn Holdings Limited | Manufacturing | 2017 |
| DEM Development Invest Ltd | Real estate | 2019 |
| DEM Label Ltd | Wholesale & retail | 2025 |
| DEM Media Ltd | Information & communication | 2022 |
| Dematar Technology Co., Ltd | Information & communication | 2025 |
| Demax Properties Limited | Real estate | 2021 |
| Dementia Care & Therapeutic Training Ltd | Administrative & support | 2019 |
| Demi Commerce Online Limited | Other services | 2025 |
| Demi Leigh Ltd | Wholesale & retail | 2025 |
| Demodem Ltd | Construction | 2020 |
| Demola Martins UK Limited | Real estate | 2018 |
| Demon Drinks Limited | Wholesale & retail | 2010 |
| Demons Soaps Limited | Extraterritorial | 2025 |
| Demorgan Enterprise Ltd | Hospitality | 2018 |
| Demuirgence Ltd | Information & communication | 2024 |
| DENA92 Ltd | Manufacturing | 2017 |
| Denby Property Group Ltd | Real estate | 2021 |
| Dench Myriad Ltd | Agriculture & fishing | 2015 |
| Dendriciti Limited | Manufacturing | 2018 |
| Denehouse Developments Ltd | Wholesale & retail | 2025 |
| Denestech Limited | Manufacturing | 2006 |
| Deng Dongdong Trading Co., Ltd | Wholesale & retail | 2025 |
| Dengetio Solutions Ltd | Administrative & support | 2021 |
| Denham Healthcare Ltd | Administrative & support | 2021 |
| Denial FPC2 Ltd | Information & communication | 2021 |
| Denim Stori Ltd | Wholesale & retail | 2026 |
| Deniss Ltd | Real estate | 2025 |
| Denivex Ltd | Wholesale & retail | 2025 |
| Deniz International Foreign Trade UK Limited | Wholesale & retail | 2024 |
| Denkelia Nutritional Products Ltd | Health & social care | 2019 |
| Denmar Consulting Limited | Professional & scientific | 2019 |
| Dennings of Newport Limited | Professional & scientific | 1993 |
| Denny and Kamson Ltd | Wholesale & retail | 2018 |
| Dennydees Limited | Professional & scientific | 2024 |