| D. Shaw (Machinery Installations) Limited | Chadderton | 1990 |
| D. W Events Limited | London | 2024 |
| D.A Crawford Inc Limited | Motherwell | 2022 |
| D.A Crawford Ltd | Motherwell | 2019 |
| D.A. Entertainments Limited | Dorchester | 1976 |
| D.A. Lees & Daughters Limited | Bourne | 2020 |
| D.A.G. Lighting Limited | Gourock | 2026 |
| D.Asees Ltd | Camberley | 2021 |
| D.B. Studios Ltd. | Lincoln | 1996 |
| D.C. Glover Limited | Sheffield | 2013 |
| D.G. Cricket Limited | Leighton Buzzard | 2006 |
| D.G. Limited | London | 1972 |
| D.G.Jacobi Limited | Epsom | 1964 |
| D.H.A. Design Services Limited | London | 1988 |
| D.Hillier Holdings Ltd | Glasgow | 2025 |
| D.I.N. Productions Limited | London | 2009 |
| D.J. Ferret Limited | Alfreton | 2007 |
| D.J. Mixing&Mastering Ltd | London | 2023 |
| D.J.C. (Amusements) Limited | Staffordshire | 1995 |
| D.M & J.L Webster Ltd. | Norwich | 2014 |
| D.Madhouse Ltd | Kington | 2025 |
| D.N.A. Club Limited | Birmingham | 2024 |
| D.P. Leisure Limited | Great Yarmouth | 1991 |
| D.P.E. Productions Limited | Wallington | 2016 |
| D.P.Press Limited | Kent | 1956 |
| D.R Motorsport Ltd | Norwich | 2026 |
| D.R Sports Turf Consultancy Ltd | Hemel Hempstead | 2024 |
| D.R. Simpson (Chilled Foods) Limited | Hull | 1991 |
| D.R.F.C. Limited | Droitwich | 1998 |
| D.V.8. Films Limited | London | 1991 |
| D.W. Stunts Limited | Leigh-On-Sea | 2024 |
| D.W.F. Sports Limited | Horsham | 1980 |
| D1 Assets Ltd | Bilston | 2025 |
| D1 Fitness & Education Ltd | Crook | 2023 |
| D1 Fitness Gym Ltd | Bradford | 2023 |
| D1 Gyms Ltd | Birmingham | 2024 |
| D1 Pilates Ltd | Stalybridge | 2025 |
| D1 Stores Ltd | Birmingham | 2025 |
| D13 Group Ltd | Alderley Edge | 2011 |
| D13EGO Limited | London | 2022 |
| D1G1 Ltd | Datchet | 2023 |
| D1LON Limited | Winchester | 2020 |
| D1MGY Media & Promotions CYF | Cardiff | 2024 |
| D2 Artworks Limited | St. Albans | 2014 |
| D2 Padel & Pickleball Coaching Foundation | Ashton | 2025 |
| D2-UK Ltd | East Grinstead | 2009 |
| D22 Hockey Academy Limited | Pinner | 2022 |
| D2D Academy Ltd | Dorking | 2021 |
| D2E Academy Limited | Lancaster | 2026 |
| D2STUDIOS Ltd | Birmingham | 2021 |
| D3 Events Ltd | Hereford | 2009 |
| D3 Productions Ltd | Chorley | 2022 |
| D3 Racetec Limited | Lichfield | 2014 |
| D3 Racing Solutions Ltd | Buckingham | 2014 |
| D3 Underwood Ltd | Borehamwood | 2019 |
| D3D Studios Ltd | Ruislip, | 2025 |
| D3HREE Limited | The Parklands | 2002 |
| D3K Ltd | Manchester | 2009 |
| D3M0GR4PH1C5 Ltd | Dundee | 2025 |
| D4KO Ltd | London | 2026 |
| D6 Culture Ltd | Newcastle Upon Tyne | 1991 |
| D6 Productions Limited | Welwyn | 2021 |
| D8 Limited | Glasgow | 2005 |
| D9 Management Ltd | Kings Heath | 2019 |
| D9COACHING Ltd | Stone | 2024 |
| DA Capo Events Ltd | London | 2019 |
| DA Capo Music Ltd | Bracknell | 2019 |
| DA Coaching Services Ltd | South Shields | 2026 |
| DA Competitions Ltd | Glenrothes | 2025 |
| DA Costa Football Academy Ltd | London | 2024 |
| DA Fuchaman Ltd | Bristol | 2022 |
| DA Gairdins Environment Company | Shetland | 2006 |
| DA JP Art Limited | London | 2025 |
| DA Poetry JAM CIC | High Wycombe | 2025 |
| DA Shellery Ltd | Leeds | 2024 |
| DA Shindig Ltd | London | 2021 |
| DA Training & Performance Limited | Redditch | 2016 |
| Da'Lemmaa Network Ltd | Newcastle Upon Tyne | 2026 |
| Da-Beat Limited | Ruislip | 2008 |
| Da-Firm Basketball Clinic Ltd. | London | 2008 |
| DA1F3 Limited | Tilbury | 2024 |
| DAA Management Limited | London | 2009 |
| Daatb Ltd | Newton Abbot | 2018 |
| Daays AV Ltd | Southend-On-Sea | 2025 |
| DAB Entertainment Ltd | Doncaster | 2023 |
| DAB Events Hospitality Ltd | Ayr | 2021 |
| DAB Golf Ltd | Northallerton | 2022 |
| Dabbofficial Ltd | Leicester | 2023 |
| Dabeezds Ltd | Hayes | 2024 |
| Dabnbool Limited | London | 2026 |
| Daboyzzpr Ltd | Greenford | 2024 |
| DAC Paisley Limited | Motherwell | 2024 |
| Dacarter Ltd | London | 2023 |
| Dace Studio Limited | London | 2008 |
| Dacio Caballero Stunts Ltd | Gateshead | 2015 |
| Daco Ltd | Penrith | 2021 |
| Dacorum Machinery and Steam Preservation Group Limited | Hemel Hempstead | 2007 |
| Dacorum Sports Trust | Maidenhead | 2003 |
| Dacorum Triathlon Club Ltd | Hemel Hempstead | 2019 |
| Dacosta Grove Entertainment Ltd | Smethwick | 2025 |