| D H Boxing Limited | Normanton | 2018 |
| D H Defence Academy Limited | Wednesbury | 2018 |
| D H Entertainment Services Limited | King'S Lynn | 2022 |
| D H Jones Racing Limited | Pontypridd | 2003 |
| D H Training Club Limited | Cradley Heath | 2025 |
| D Harries Ltd | London | 2019 |
| D J Egan Racing Ltd | Fordham Ely | 2019 |
| D J Hannu Limited | Winchester | 2002 |
| D J Motorsport Limited | Rochester | 1995 |
| D J P Promotions Limited | Hounslow | 2018 |
| D J S Ltd | Kent | 2005 |
| D Johnson Associates Limited | Manchester | 2017 |
| D K Music Management Limited | Hove | 2010 |
| D K Productions Ltd | Wantage | 2018 |
| D K Sports Management Limited | Ipswich | 2010 |
| D K Stead Limited | Harrogate | 2004 |
| D Ladden-Hall Ltd | Leeds | 2023 |
| D M Licencing Limited | Birmingham | 2020 |
| D Mcgranaghan Limited | Belfast | 1965 |
| D Mcgrath Limited | Greenford | 2008 |
| D Mcmenamin Racing Limited | Penrith | 2022 |
| D P (UK) Limited | Halstead | 1993 |
| D P Racing Limited | Abingdon | 2021 |
| D P Tennis Coaching Limited | Sturminster Newton | 2026 |
| D Povey Ltd | Uttoxeter | 2024 |
| D R Holt Limited | Dorchester | 2009 |
| D R Major Limited | Ashford | 2015 |
| D Racing Ltd | London | 2026 |
| D Richards Fitness Ltd | Swansea | 2019 |
| D Rosa Fit Coaching Ltd | London | 2025 |
| D S Entertainment Limited | Southport | 2017 |
| D S Fisheries Ltd | Hullbridge, Hockley | 2020 |
| D S Golf Event Management Limited | Epsom | 2017 |
| D S H Carpentry & Design Ltd. | Chipping Norton | 2003 |
| D Sills Services Ltd | Rickmansworth | 2024 |
| D State Music Limited | Abingdon | 2021 |
| D T C Productions Limited | Gainsborough | 2003 |
| D T Fitness Limited | Nantwich | 2016 |
| D Unit Space Ltd | Bristol | 2022 |
| D V B Music Ltd | London | 2025 |
| D W M Scott Limited | Stirling | 2019 |
| D Warde Music Ltd | London | 2022 |
| D Webster Golf Ltd | Preston | 2011 |
| D Z Sports Limited | Buckingham | 2000 |
| D!Ngo Ltd | Sunderland | 2023 |
| D&A TEC Ltd | Canterbury | 2026 |
| D&C Amusements Ltd | Portsmouth | 2026 |
| D&C Dublin Limited | Stockport | 2017 |
| D&C Fitness Limited | London | 2024 |
| D&D Yachting Ltd | London | 2026 |
| D&F Creative Limited | Guildford | 2013 |
| D&F Swim School Ltd | Ashford | 2025 |
| D&H Foundry Gyms Ltd | Bromsgrove | 2024 |
| D&M Entertainment Limited | London | 2025 |
| D&M Events Ltd | Castlederg | 2021 |
| D&M Health Investments Ltd | Bramhall | 2022 |
| D&M Rides Ltd | Ashby-De-La-Zouch | 2026 |
| D&R Games Ltd | London | 2024 |
| D&S Sports Management Limited | London | 2016 |
| D&S Swim School Limited | Crayford | 2016 |
| D&T 247 Fitness Ltd | Addington West Malling | 2019 |
| D&T Bouncy Castles Ltd | Sittingbourne | 2017 |
| D&T Fitness Ltd | Preston | 2015 |
| D&T's Health LAB Ltd | Manchester | 2021 |
| D&W Coaching Limited | Studley | 2020 |
| D'Arcy Equestrian Limited | Maldon | 1995 |
| D'Argent Ltd | Woodford Green | 2017 |
| D'Eyncourt-Harvey Ltd | London | 2024 |
| D'Oyly Carte Opera Trust Limited(The) | London | 1961 |
| D'Silva Fitness Ltd | London | 2024 |
| D'Soul Collective Ltd | London | 2026 |
| D-12 Fitness Limited | Carmarthen | 2011 |
| D-Artfactory Limited | Thornton Heath | 2014 |
| D-Bond Ltd | London | 2014 |
| D-Day Dorset Ltd | Dorchester | 2015 |
| D-Flat Music Limited | Borough Green | 2022 |
| D-Live! CIC | Chatham | 2018 |
| D-Lux Arts CIC | Dumfries | 2016 |
| D-Montex Limited | London | 2026 |
| D-Railed Dance Ltd | Biggleswade | 2019 |
| D-Set Records Ltd. | Clydebank | 2005 |
| D-Sports Games Channel Ltd | London | 2025 |
| D-Vision Management Limited | London | 2010 |
| D-Whyte Ltd | London | 2022 |
| D. & D. Amusements Ltd. | Glasgow | 1999 |
| D. & S. Shaw Limited | Preston | 2003 |
| D. Briggs Associates Limited | Nr Reading | 1984 |
| D. C. Golf Limited | Staffs | 1997 |
| D. COX Amusements Limited | Nottingham | 1985 |
| D. G. E. Entertainment Ltd | Bromsgrove | 2026 |
| D. Griffin Art & Design Ltd | Broadstairs | 2021 |
| D. Horley Limited | Redhill | 2009 |
| D. J. + J. E. White (AP) Limited | Skegness | 2012 |
| D. Mcguire I.R. Limited | Leeds | 2008 |
| D. Murray Enterprises Limited | London | 1982 |
| D. Murray Holdings Limited | London | 1998 |
| D. Murray Management Limited | London | 1998 |
| D. O. Productions Limited | Waterlooville | 2011 |
| D. P. Jones Creative Ltd | London | 2024 |
| D. S. Angling Limited | Bristol | 2012 |