| Dorset Stained Glass Limited | Sturminster Newton | 2019 |
| Dorset Visual Arts (Promotions) Limited | Bridport | 2005 |
| Dorset Volksfest Limited | Poole | 2013 |
| Dorset Waterpark Limited | Swanage | 2015 |
| Dorset's Ultimate Canoe Kayaking Squad Community Interest Company | Bournemouth | 2011 |
| Dorsetborn Ltd | Wimborne | 2024 |
| Dorsetfest CIC | Blandford Forum | 2024 |
| Dorubako Limited | Epsom | 2019 |
| Dorukhan Ltd | Macclesfield | 2019 |
| Doryoku RYU Karate Jutsu Limited | Basildon | 2009 |
| DOS Global Ltd | London | 2024 |
| DOS on Stage Ltd | Thames Ditton | 2023 |
| Dosf UK Limited | Greenford | 2024 |
| Doshi Levien Limited | London | 2012 |
| Dosi Camp Ltd | London | 2024 |
| DOT 9 Events Ltd | Rednal | 2019 |
| DOT and Line Ltd | London | 2026 |
| DOT Art Limited | Birkenhead | 2006 |
| DOT Art Services CIC | Birkenhead | 2009 |
| DOT COM City Ltd. | London | 2026 |
| DOT Dash Creative Ltd | Colchester | 2025 |
| DOT Events Ltd | Brighton | 2025 |
| DOT Systems Limited | London | 2020 |
| DOT to DOT Drama Limited | Birdlip | 2013 |
| DOT to DOT Printing Ltd | Harlow | 2014 |
| Dotbasedart Ltd | Portsmouth | 2024 |
| Dotdot Design Limited | Dorchester | 2011 |
| Dotframes Creative Studios Limited | London | 2022 |
| Dotframes Limited | Cardiff | 2020 |
| Dothefast Ltd | | 2002 |
| Dotlinedot Ltd | Ealing | 2015 |
| Dotmasters Limited | Loughton | 2018 |
| Dotted Line Touring Services Ltd | Liverpool | 2024 |
| Dotted Note School of Music Ltd | Watford | 2020 |
| Dottie Dollie Ltd | Colchester | 2010 |
| Dottie Ltd | Hastings | 2014 |
| Dottir Strength, Fitness and Wellbeing Ltd | Hebburn | 2025 |
| Dotts Fitness Limited | Derby | 2021 |
| Dotwavnotwave Limited | London | 2024 |
| Double 7 Holdings Ltd | Spalding | 2025 |
| Double a Group Services Limited | London | 2001 |
| Double Break Ltd | Bristol | 2023 |
| Double Century Race Management Limited | Trearddur Bay | 2011 |
| Double D Live Ltd | Lincoln | 2019 |
| Double D Productions Ltd | London | 2019 |
| Double Dagger Fitness Ltd | Stone | 2014 |
| Double Diamond Gaming Limited | Birmingham | 2009 |
| Double Down Stunts Limited | London | 2015 |
| Double Dunt Records Ltd | Manchester | 2022 |
| Double Dutch Records Limited | London | 2017 |
| Double Elephant CIC | Exeter | 2002 |
| Double Elephant Creative Limited | Farnborough | 2014 |
| Double Eleven Darts Ltd | Mildenhall | 2026 |
| Double Fault Productions UK Ltd | Surbiton | 2024 |
| Double H Racing Limited | Warrington | 2022 |
| Double Handed Offshore Ltd | Exeter | 2020 |
| Double ID Limited | London | 2003 |
| Double J Boxing Gym Ltd | Erith | 2018 |
| Double Jacket Arts Ltd | Keighley | 2021 |
| Double Jinx Ltd | London | 2023 |
| Double L Games Limited | Matlock | 2017 |
| Double Mack Limited | Rochford | 2022 |
| Double O Global Limited | Cardiff | 2017 |
| Double O Promotions Limited | London | 1976 |
| Double P Productions Ltd | London | 2017 |
| Double R Design Limited | London | 2010 |
| Double R Racing Limited | Woking | 2004 |
| Double SIX Leisure Limited | Skegness | 2022 |
| Double Stop Ltd | Glasgow | 2012 |
| Double T Enterprises Limited | Cardiff | 2017 |
| Double Telling Ltd | London | 2023 |
| Double the Action Ltd | London | 2023 |
| Double Triangle Limited | Harlow | 2025 |
| Double Trouble Games Ltd | Doncaster | 2018 |
| Double Vision Limited | London | 2019 |
| Double Zero Racing Ltd | Orlingbury | 2019 |
| Doubleit Casino Ltd | Bristol | 2025 |
| Doublem Playcentres Ltd | Brentwood | 2012 |
| Doublerhyme Limited | Hessle | 2008 |
| Doubletake Theatre Ltd | Morden | 2024 |
| Doublevision Conditioning Limited | Bedford | 2011 |
| Doubtfire Creative CIC | Scarborough | 2026 |
| Dougie Costello Limited | York | 2007 |
| Dougie Evans | Norwich | 2022 |
| Dougie Lampkin Limited | Skipton | 2018 |
| Douglas Dare Limited | London | 2016 |
| Douglas Duffin Equestrian Ltd | Glasgow | 2018 |
| Douglas Equine Limited | Kirknewton | 2015 |
| Douglas Green Studio Limited | Stevenage | 2021 |
| Douglas Motor Cycles Limited | Maldon | 1998 |
| Douglas SA Ltd | London | 2024 |
| Douglas Valentine Limited | London | 2002 |
| Douglas White Studio Limited | London | 2024 |
| Dougwinder Ltd | Rugby | 2019 |
| DOUVELLE19 Ltd | Sheffield | 2024 |
| Dove Ellis Ltd | London | 2024 |
| Dove Foundation CIC | Callington | 2021 |
| Dove House Studios Ltd | London | 2023 |
| Dove Productions Ltd | Callington | 2021 |
| Dove Tale Joint Limited | Durham | 2015 |