| D.K. Engineering Limited | Rickmansworth | 1988 |
| D.K. Young & Associates Limited | Diss | 1999 |
| D.L.D. Designed Lighting & Distribution Limited | Blackpool | 2016 |
| D.L.V. UK Limited | Wickford | 2001 |
| D.M. Grounds Care Ltd | Glasgow | 2005 |
| D.M. Priest & Co Limited | Stockport | 2005 |
| D.M.L. Service Rendered Ltd | London | 2025 |
| D.M.S. (Air Freight) Limited | Arundel | 1976 |
| D.P.C. Developments Limited | Cookstown | 1985 |
| D.P.P. Restaurants Limited | | 2001 |
| D.R. Dunthorn & SON Limited | York | 1946 |
| D.R. Measom Contractors Ltd | Leicester | 2025 |
| D.R. Mitchell Holdings Ltd | Carrickfergus | 1996 |
| D.S. Levien Advisors Limited | London | 2013 |
| D.S. Metals Limited | Surrey | 2000 |
| D.S.A the Dental Scanning Academy Limited | Banbury | 2025 |
| D.S.Devonport Consulting Ltd | Leeds | 2023 |
| D.S.M.L Properties Ltd | Stockport | 2024 |
| D.S.T. Pattern and Engineering Company Limited | Bury | 1985 |
| D.Sainter & Sons Limited | Wakefield | 1950 |
| D.T. Hobbs Plastering Ltd | Old Coulsdon | 2011 |
| D.V. Watkins Developments Limited | Leominster | 2011 |
| D.V. Williams (Transport) Limited | Telford | 1990 |
| D.W. Financial Management Limited | Kenilworth | 2020 |
| D.W. Financial Projects Limited | Kenilworth | 2020 |
| D.W.P. Products Limited | Stoke On Trent | 2000 |
| D1CE Ltd | Harrogate | 2020 |
| D2 Event Invest Limited | London | 2025 |
| D2 Industrial Ltd | Sheffield | 2009 |
| D2 Integrated Systems Ltd | London | 2024 |
| D2 Maintenance Ltd | Chatham | 2023 |
| D2D Fixings Ltd | Rochdale | 2024 |
| D2R Cross Media Ltd | Harrow | 2011 |
| D2SQUARE Ltd | Birmingham | 2021 |
| D2W Limited | Borehamwood | 2002 |
| D3 Group Limited | Harlow | 2000 |
| D3O LAB Limited | Croydon | 2005 |
| D3O Limited | Croydon | 2005 |
| D44 Limited | Tiverton | 2020 |
| D44 Properties Limited | Tiverton | 2014 |
| D4D Ltd | Harrogate | 2015 |
| D6 Digital Ltd | Canterbury | 2022 |
| D7 RGF Limited | Banbridge | 2012 |
| DA Blue Whale Co., Ltd | Beckenham | 2024 |
| DA Integrating Limited | Manchester | 2013 |
| DA Ltd | Newmarket | 2009 |
| DA Nunzio Italian Delicatessen Ltd | Bournemouth | 2024 |
| DA QIN Trading Co., Limited | West Midlands, England, | 2017 |
| DA Studio Ltd. | Harrow | 2024 |
| DA Vincis Pencil Limited | Aylesbury | 2016 |
| DAA Restaurant Ltd | Windsor | 2014 |
| Daad Real Estate Limited | Milton Keynes | 2016 |
| Daamart Limited | London | 2015 |
| Daash Limited | New Malden | 2013 |
| DAB Testing Services Ltd | Burnham-On-Crouch | 2015 |
| Dabbity Ltd. | Edinburgh | 2022 |
| Dabble Enterprises Limited | Retford | 2014 |
| Dabek Bema Limited | Abingdon | 2024 |
| Dabeluchukwu Chidubem Okafor Ltd | London | 2025 |
| Dabitec Limited | Bognor Regis | 2009 |
| Dabmsb Ltd | Lytham St. Annes | 2009 |
| DAC Sipp Trustees Limited | Abbotsley | 2016 |
| DAC Ssas Trustees Limited | St Neots | 2021 |
| DAC Trustee Holdings Limited | St. Neots | 2024 |
| DAC Trustees Limited | Abbotsley | 2015 |
| Dace Invest Limited | London | 2005 |
| Daceg Ltd | London | 2020 |
| Dacha Property Management Limited | Farnham | 2022 |
| Dachi Ltd | Dagenham | 2022 |
| Dacrown Properties Limited | London | 2014 |
| Dacs Document Storage Limited | Lutterworth | 2011 |
| Dadabhoy Foundation | London | 2008 |
| Dadad Ltd | London | 2009 |
| Dadart Limited | London | 1980 |
| Daddy Limited | London | 2005 |
| Dadini Icecream Limited | Essex | 2008 |
| Dadnam Medical Ltd | Cardiff | 2023 |
| Dads Tyres Limited | Gloucester | 2007 |
| Dadsnet Limited | Northampton | 2021 |
| Dadson Software Limited | Cheltenham | 2012 |
| Daedal Developments Ltd | London | 2019 |
| Daedalus Aviation UK Limited | Nuneaton | 2006 |
| Daeltash Ltd | London | 2021 |
| Daesco Ltd | Larbert | 2023 |
| Daffodil Homes Limited | Staffordshire | 2004 |
| Daffodil Innovations Limited | Swansea | 2025 |
| Dafman Limited | London | 2019 |
| Dafne Yachting Limited | Blackpool | 2023 |
| Dafville Ltd | Salford | 2009 |
| Dafydd Morgan Consultancy Limited | Newport | 2011 |
| DAG FM Services Limited | York | 2013 |
| Dagenham 1964 Limited | Dagenham | 2014 |
| Dagger Transit Limited | Sevenoaks | 2012 |
| DAH Investment Management Ltd | Edinburgh | 2012 |
| Dahila Investco Holdco Limited | Shirebrook | 2016 |
| Dahira Jeuzbul Xulob CIC | Leicester | 2021 |
| Dahlem Property Holdings Limited | London | 2006 |
| Dahmer Ltd | Worthing | 2023 |
| Dahuatex Industrial Limited | Manchester | 2018 |
| Daiichi Chuo Shipping (Europe) Ltd | London | 2011 |