| Decisive Zone UK Ltd | London | 2025 |
| Deck Leisure Group Limited | Tarporley | 2014 |
| Deckard Associates Ltd | Scarborough | 2017 |
| Deckchair Barbering and Hairdressing Ltd | Nottingham | 2017 |
| Deckers Restaurants Limited | Rochdale | 2020 |
| Decking, Fencing and Gates Warrington Limited | Warrington | 2026 |
| Deckshare Limited | Birmingham | 2008 |
| Deco Rocks Ltd | St Albans | 2019 |
| Decode Urbanism Office Limited | Beckenham | 2010 |
| Decodiva Ltd | Stanford-Le-Hope | 2023 |
| Decofast Ltd | London | 2018 |
| Decohyd Products Co., Ltd | London | 2013 |
| Deconstruction Records Limited | Warrington | 2010 |
| Decor Cladding Distribution Ltd | Glasgow | 2021 |
| Decor Cladding Ltd | Glasgow | 2021 |
| Decor Ltd | London | 2001 |
| Decor Panels Distribution Ltd | Glasgow | 2021 |
| Decor Premium Limited | Wolverhampton | 2020 |
| Decor TV Ltd | Wakefield | 2014 |
| Decora Blinds Limited | | 2006 |
| Decorate Edinburgh Ltd | Dumfries | 2019 |
| Decorated Tables Ltd | Orpington | 2016 |
| Decorating Technology Limited | Halifax | 2020 |
| Decoration Nation Ltd | Northampton | 2024 |
| Decorative Acrylic Co. Limited | Nottingham | 1965 |
| Decorative Plaster Company (Newcastle) Limited | Newcastle Upon Tyne | 1927 |
| Decorative Screens Limited | Barnsley | 2019 |
| Decorative Tiles Ltd | Crewkerne | 2022 |
| Decorator Depot Limited | 3 Dorset Rise | 2013 |
| Decorators DEN Contractors Ltd. | Bromley | 2018 |
| Decorlamps Ltd | Bristol | 2015 |
| Decorum Interiors Ltd | Ibstone | 2006 |
| Decorumdiy Ltd | London | 2026 |
| Decorx Ltd | London | 2019 |
| Decoy Barns Property Management Company Limited | Liverpool | 2013 |
| Decree Limited | London | 2018 |
| Decrown Limited | Sutton Coldfield | 2007 |
| Decuevas Limited | Tunbridge Wells | 2010 |
| DED GUD Limited | Amersham | 2024 |
| Dedham Hall Management Limited | Colchester | 2007 |
| Dedicated Brands Limited | Coventry | 2013 |
| Dedico Limited | Brighton | 2005 |
| Dedipower Managed Hosting Limited | Maidenhead | 2003 |
| Dedman Property Auctions Limited | Southend-On-Sea | 2011 |
| DEE and Datch Food Fight Limited | Birmingham | 2010 |
| DEE DOO Limited | Corby | 2004 |
| DEE Hardwicke Limited | Crickhowell | 2012 |
| Deeb International Freight Forwarders Ltd | London | 2025 |
| Deebe Limited | Reading | 2017 |
| Deeble Limited | Halesowen | 2013 |
| Deecom Ltd | Blackburn | 2025 |
| Deed Poll Ltd | Ilminster | 2021 |
| Deed Poll Service Limited | Ilminster | 2012 |
| Deedmix Limited | Wickford | 2009 |
| Deedmoss Limited | Bridgend | 2026 |
| Deedosh Ltd. | Haverfordwest | 2025 |
| Deedrise Limited | Bridgend | 2026 |
| Deegan & Sons Ltd | Orpington | 2024 |
| Deejays Tanker Service Limited | King'S Lynn | 2020 |
| Deekaa Limited | St Helens | 2014 |
| Deen Dynamics Limited | Westcliff-On-Sea | 2024 |
| Deen International Ltd | Dudley | 2019 |
| Deenh Industriearmaturen GmbH Limited | Beckenham | 2023 |
| Deep Blue Energy Ltd | Newbridge | 2024 |
| Deep Blue Green Limited | Banchory | 2021 |
| Deep Blue London Ltd | Bromley | 2025 |
| Deep Blue Peak Ltd | London | 2025 |
| Deep Blue Sea Ltd | Hoylake | 2015 |
| Deep Blue Yachting Ltd | London | 2023 |
| Deep Blue Yachts Limited | London | 2023 |
| Deep Clean 24SEVEN Ltd | Saffron Walden | 2013 |
| Deep Clean Services Limited | Newport Pagnell | 1998 |
| Deep Cognition Ltd | Guildford | 2006 |
| Deep Dene Properties Ltd | Chester | 2021 |
| Deep Freeze Limited | Harrogate | 2012 |
| Deep Grey Company Limited | Reading | 2011 |
| Deep Holdings Ltd | London | 2019 |
| Deep Kleen Limited | Shirley Croydon | 1996 |
| Deep Purple Limited | Braintree | 1997 |
| Deep River Limited | London | 2009 |
| Deep Sea Marin Limited | London | 2024 |
| Deep Sea Space Limited | Preston | 2021 |
| Deep Treasure Ltd | London | 2020 |
| Deepa Mistry Limited | Leicester | 2016 |
| Deepa Vikraman Ltd | Edinburgh | 2011 |
| Deepbridge Limited | Chester | 2015 |
| Deepdale Estates Management Ltd | Scarborough | 2015 |
| Deepdene (Isle of Wight) Management Company Limited | Shanklin | 1992 |
| Deepfaster Steel Manufacture Co., Ltd | Beckenham | 2019 |
| DEEPGREEN2030 Ltd | Bourne | 2020 |
| Deepinlocks Limited | Peterborough | 2021 |
| Deeplas Building Plastics Limited | Alfreton | 2009 |
| Deeplas Limited | Alfreton | 2009 |
| Deeplight Technologies Limited | Reading | 2020 |
| Deepstore Limited | Winsford | 1991 |
| Deeptrust Trading Limited | Kenilworth | 2011 |
| Deer Darling Promotions (UK) Ltd | London | 2020 |
| Deer Golden Industrial Co., Ltd | Beckenham | 2015 |
| Deer Park Properties Limited | Newport | 2004 |
| Deer Park Way 53 Limited | Sheffield | 2013 |