| Delm Beauty Tools Ltd | Beckenham | 2019 |
| Deloitte NSE NO3 Limited | London | 2020 |
| Delph & Co Ltd | Norwich | 2004 |
| Delph Solutions 2020 Limited | Maldon | 2008 |
| Delphi Marketing Research Limited | London | 2013 |
| Delphinus Biotech Ltd | London | 2019 |
| Delphis Eco (International) Limited | London | 2014 |
| Delphis Retail Ltd | London | 2014 |
| Delrosa Developments Limited | Markfield | 1993 |
| Delt Fire Ltd | Braintree | 2025 |
| DELT4 Ltd | Manchester | 2022 |
| Delta Bridging North Ltd | Manchester | 2020 |
| Delta Bridging South Ltd | Manchester | 2020 |
| Delta Community Housing Limited | London | 2024 |
| Delta Concrete Products Ltd | London | 2022 |
| Delta Construction Trading UK Limited | London | 2020 |
| Delta Facility Ltd. | London | 2008 |
| Delta for Trading & Services Limited | Manchester | 2026 |
| Delta Forge Limited | Fareham | 2024 |
| Delta Galil Europe Limited | London | 1962 |
| Delta Global Source (China) Limited | Whetstone,Leicester | 2012 |
| Delta Global Source Group Limited | Leicester | 2016 |
| Delta International Consultancy Limited | Camberley | 1991 |
| Delta Lease Limited | Dartford | 2021 |
| Delta Marine Technologies Ltd | Sible Hedingham | 2021 |
| Delta Plant Limited | Bristol | 1998 |
| Delta Polythene Limited | Corby | 1978 |
| Delta Reinsurance Brokers Limited | London | 1974 |
| Delta Repetition Components Limited | Esher | 1948 |
| Delta Rods (West Bromwich) Limited | Worthing | 1891 |
| Delta Rods Wolverhampton Limited | Worthing | 1953 |
| Delta Security Contracts Limited | London | 2008 |
| Delta Security Limited | London | 2014 |
| Delta Time Ltd | Leeds | 2014 |
| Delta Tubes Limited | | 1897 |
| Delta Wave Trading Company Ltd | Manchester | 2026 |
| Delta Wealth Management Limited | Chelmsford | 2025 |
| Delta Yacht Ltd | London | 2025 |
| Delta Yachting Ltd | London | 2025 |
| Delta-Othala Ltd | St. Neots | 2021 |
| Deltaflow Limited | Worthing | 1963 |
| Deltagap Limited | Ormskirk | 2020 |
| Deltaglobe Ltd | Fareham | 2019 |
| Deltair Limited | Waterlooville | 2015 |
| Deltamind Solutions Limited | High Wycombe | 2022 |
| Deltasignia Limited | Malvern | 2024 |
| Deltatek Limited | Broxbourne | 2020 |
| Deltawaite (NBE) Limited | Cumbria | 1965 |
| Deltawaite Tools Limited | Barrow In Furness | 1979 |
| Deltawaste Resource Limited | Macclesfield | 2016 |
| Deltaxignia Limited | Malvern | 2024 |
| Deltron Lifts Coastal Limited | Kingswinford | 2025 |
| Delux Ltd | Dartford | 2006 |
| Deluxe Beds (UK) Ltd | Huddersfield | 2013 |
| Deluxe DETAILING786 Limited | Stockton-On-Tees | 2024 |
| Deluxe Digital Studios Limited | Perivale | 1998 |
| Deluxe Homes Developments Limited | Newcastle Upon Tyne | 2007 |
| Deluxe Irish Golf Ltd | Londonderry | 2024 |
| Deluxe Living Properties Ltd | Mitcham | 2023 |
| Deluxe Soft Toys London Limited | Stanmore | 2016 |
| Deluxe Ventures Ltd | London | 2019 |
| Delvemade Limited | Castleford | 1991 |
| DEM Crew Limited | Barry | 2022 |
| DEM Real Estate Ltd | London | 2013 |
| Demand LED Ltd | Pontypool | 2004 |
| Demanda Concepts Limited | Halstead | 2024 |
| Demarec UK Limited | Dover | 2023 |
| Demback Limited | Clifton | 2018 |
| Demef Ltd | London | 2025 |
| Dementia Counselling Ltd | Exeter | 2022 |
| Dementia Knights Limited | Swansea | 2025 |
| Dementia Research England Limited | London | 2021 |
| Dementia Research Scotland Limited | Glasgow | 2021 |
| Dementia Wellness Ltd | Chichester | 2025 |
| Demesk Medical Technology Co., Ltd | London | 2024 |
| Demesne (Fortwilliam) Management Company Limited - the | Belfast | 2005 |
| Demeter Venture UK Limited | Beckenham | 2011 |
| Demetra Holding Ltd | Bury St. Edmunds | 2023 |
| Demetris Theophilou Limited | Birmingham | 2025 |
| Demeza Holdings Limited | Cambridge | 2019 |
| Demi Technology Co., Ltd | London | 2020 |
| Demic Ltd | Harrogate | 2012 |
| Deming Forum UK Limited | Milton Keynes | 2000 |
| Demir Marin Co Ltd | London | 2024 |
| Demire Subscriber Limited | Polegate | 2013 |
| Demista Limited | Glenrothes | 1998 |
| Demkel UK Limited | Rotherham | 2002 |
| Demo Group Co., Ltd | Manchester | 2014 |
| Democoup Invest Ltd | Dover | 2022 |
| Democoup Ltd | Dover | 2022 |
| Demodami Studios Ltd | London | 2021 |
| Demographic Republic of Baldstyled Limited | Liverpool | 2017 |
| Demolition Games Limited | Bromley | 2007 |
| Demolition Spotlight Ltd | Bognor Regis | 2025 |
| Demon Capital Limited | Herne Bay | 2010 |
| Demon Collectibles Ltd | Chesterfield | 2021 |
| Demon Corporation Ltd | Bedlington | 2021 |
| Demon Pixels Limited | Cheltenham | 2010 |
| Demons Soaps Limited | Cardiff | 2025 |
| Demtec Limited | Welwyn Garden City | 2021 |