| Donny Members Club Ltd | Doncaster | 2025 |
| Donnyfest Nights Ltd | Doncaster | 2026 |
| Donomo Limited | London | 2018 |
| Donoso Polo Ltd | Midhurst | 2023 |
| Donotalight Ltd | Harlow | 2022 |
| Donovan's Academy of Dance and Theatre Arts Limited | Hornchurch | 2012 |
| Dons CIC | Doncaster | 2023 |
| Donside Gymnastics Limited | Balgownie Road, Bridge Of Don | 2019 |
| Donsound Limited | Wiltshire | 1988 |
| Dont Bottle IT UP Ltd | Leeds | 2025 |
| Dont Burst My Bubble Ltd | Chorley | 2022 |
| Dont Play Ltd | London | 2026 |
| Donut and the Hole Limited | London | 2022 |
| Donyatt Recreational Area | Ilminster | 2003 |
| Don’T BE Alarmed! Limited | Exeter | 2022 |
| Doobedoo Records Ltd | Nottingham | 2016 |
| Dood Productions Ltd | London | 2024 |
| Doodah Theatre | Lewes | 2002 |
| Doodle & Splat Ltd | Perth | 2008 |
| Doodle and Dream Ltd | Chesterfield | 2025 |
| Doodle Chat CIC | Leeds | 2025 |
| Doodle Holdings Limited | Buckhurst Hill | 2015 |
| Doodle Pictures Limited | Bridport | 2015 |
| Doodle Press Ltd | Blackburn | 2023 |
| Doodlebug Music Limited | London | 2021 |
| Doodlebug Studios Ltd | Salisbury | 2026 |
| Doodlelove Limited | Kendal | 2014 |
| Doodlepunchstudio Ltd | London | 2026 |
| Doodles Art and Craft Limited | Stockport | 2020 |
| Doof Doof Ltd | London | 2023 |
| Doof Ltd | London | 2023 |
| Doomsday Outlaw Ltd | Sheffield | 2023 |
| Doonhamer Media Ltd | Taunton | 2018 |
| Doopey Designs Limited | Hove | 2014 |
| Door to the River Studios Ltd | London | 2021 |
| Doorstep Arts CIC | Paignton | 2013 |
| Doorstep Kingdom Limited | Worcester | 2023 |
| Doorway to Dorkness Arcade Ltd | Doncaster | 2026 |
| Doozy Creative Ltd | London | 2006 |
| Dopamine Design Studio Ltd | Linlithgow | 2024 |
| Dopamine Labs Ltd | London | 2020 |
| Dopamine Ltd | London | 2026 |
| Dope Black Art Limited | London | 2017 |
| Dope Design Limited | Carshalton | 2006 |
| Dope Leprechaun Limited | London | 2022 |
| Dopeartdept Ltd | Manchester | 2025 |
| Dopeboy Records Limited | London | 2025 |
| Doplagos Limited | Leigh | 2025 |
| Doppa Ltd | London | 2025 |
| DOPPELGANG3R Ltd | Southampton | 2024 |
| Doppelganger Productions | Bath | 2012 |
| Dorado Records Limited | London | 1994 |
| Doram Films Ltd | London | 2015 |
| Doranbrowne Ltd | Chatham | 2021 |
| Dorcas Creates Ltd | London | 2021 |
| Dorchester Abbey Trading | Wallingford | 2005 |
| Dorchester Arts | Dorchester | 1992 |
| Dorchester Barbell Casc Ltd | Dorchester | 2014 |
| Dorchester Community Plays Association | Portland | 2010 |
| Dorchester Sailing Club | Thame | 2001 |
| Dorchester Show Limited | Dorchester | 2017 |
| Dordon Open Spaces Community Interest Company | Dordon | 2024 |
| Dore & Totley Golf Club (the) Limited | Sheffield | 1928 |
| Dore & Totley Tennis Club Limited | Sheffield | 2008 |
| Dorian Draconian Ltd | Tonypandy | 2011 |
| Dorigo 3 Media Limited | St John'S Road, Meadowfield | 2019 |
| Dorisimo Limited | London | 1979 |
| Dorking Dramatic and Operatic Society (Ddos) Ltd | Dorking | 2018 |
| Dorking Golf Club Limited | Dorking | 1914 |
| Dorking Lawn Tennis and Squash Club Limited | Surrey | 1953 |
| Dorking Philharmonia Productions Ltd | Crawley | 2025 |
| Dorking Rugby Football Club Limited | Betchworth | 2009 |
| Dorking Society | Dorking | 2004 |
| Dorking Wanderers FC Ltd | Dorking | 2014 |
| Dorks N Orks Productions Ltd | London | 2024 |
| Dormant Company 16283306 Limited | St. Helens | 2025 |
| Dormant Music Limited | Newton Abbot | 1978 |
| Dormouse Designs Ltd | High Wycombe | 2017 |
| Dornoch and District Community Association | Dornoch | 2010 |
| Dorosen Events Limited | Birmingham | 2024 |
| Dorothea Coaching Ltd | London | 2025 |
| Dorothy Brooke Training Limited | Abingdon | 2020 |
| Dorothy Coleborn School of Dancing Ltd | Bath | 2022 |
| Dorothy Creative Limited | Liverpool | 2008 |
| Dorridge Cricket Club | Solihull | 2026 |
| Dorset Arts Development Service CIC | Dorchester | 2015 |
| Dorset Bridge Ltd | Shaftesbury | 2014 |
| Dorset County Football Association Limited | Poole | 1999 |
| Dorset Diving Services Ltd | Poole | 2020 |
| Dorset Drama Academy Ltd | Dorchester | 2022 |
| Dorset Falconry Park Limited | Charmouth | 2018 |
| Dorset Futsal Club Ltd | Bournemouth | 2025 |
| Dorset Gliding Club Limited | Swanage | 1990 |
| Dorset Golf Club Broadstone Limited(The) | Dorset | 1951 |
| Dorset Golf Limited | Bournemouth | 2026 |
| Dorset Indians CIC | Poole | 2022 |
| Dorset Land Rover Club Limited | Shaftesbury | 2008 |
| Dorset Photo Booth & Entertainments Ltd | Weymouth | 2015 |
| Dorset Physical Training C.I.C. | Wareham | 2023 |
| Dorset Scuba Ltd | Bournemouth | 2020 |