| Dog Walking Field MK Ltd | Bedfordshire, Flitwick | 2024 |
| Dogbowl Productions Ltd. | Worthing | 2020 |
| Dogdyke Pumping Station Preservation Trust | Horncastle | 2009 |
| Dogface Improv Limited | Norwich | 2025 |
| Dogfest Promotions Limited | Mansfield | 2024 |
| Dogfish Ventures Limited | Liverpool | 2024 |
| Doggerland Media Ltd | London | 2020 |
| Doggett & Jones Limited | Wilts | 1991 |
| Doggie Dash Playfield Ltd | Stevenage | 2025 |
| Doghead Designs Limited | Bridgwater | 2024 |
| Doghead Productions Ltd | Northampton | 2020 |
| Dogleg Golf Ltd | Strabane | 2025 |
| Dogleg Theatre Ltd | Totnes | 2023 |
| Dogs ARE Made for Walking Limited | Preston | 2020 |
| Dogs in Wellies Ltd | West Molesey | 2025 |
| Dogs Matter Ltd | Exeter | 2015 |
| Dogs Trust Lotteries Limited | London | 2022 |
| Dogshow Limited | Liverpool | 2023 |
| Dogstar Abstracts Limited | London | 2012 |
| Dogstar AV Limited | Derbyshire | 2004 |
| Dogstar Theatre Company | Inverness | 2006 |
| Dogtooth Limited | Malton | 2006 |
| Dogwarts Ltd | Walsall | 2011 |
| DOH Softplay Ltd | Newry | 2026 |
| Doherty Consultants Ltd. | St Neots | 2015 |
| Doina Limited | Wembley | 2000 |
| Doing Nothing Going Nowhere Ltd | Norwich | 2025 |
| Dojang Ltd | Mildenhall | 2019 |
| Dojo Academy Ltd | Rotherham | 2023 |
| Dojo Karate Centre Limited | Wigan | 2024 |
| Dojo Supplies Limited | Brentwood | 2013 |
| DOK Ltd | Croydon | 2021 |
| Dokidokidoodles Ltd | Derby | 2020 |
| Dokss Management Limited | London | 2023 |
| Doku Games Ltd | Horsham | 2015 |
| Dokyo Ltd | Bedworth | 2016 |
| DOL Fitness Ltd | St. Albans | 2023 |
| Dola Gate Ltd | Manchester | 2025 |
| Dolce Strings Ltd | London | 2022 |
| Dolce Studios Ltd | Manchester | 2025 |
| Dolebolion Racing Limited | Ystrad Meurig | 2020 |
| Dolepropco Limited | Nottingham | 2022 |
| Doll Face - House of Makeup Ltd | Cookstown | 2016 |
| Dollar Hope Ltd | Kington | 2025 |
| Dollface Land Limited | Forfar | 2017 |
| Dollingstown Football Club Limited | Craigavon | 2020 |
| Dollkingdom Ltd | Church Road | 2023 |
| Dolls by Natasha Limited | Kington | 2017 |
| Dolls Mgmt Ltd | Hove | 2020 |
| Dolls Tattoo Limited | Teddington | 2021 |
| Dolly DO Ltd | Cheltenham | 2021 |
| Dolly Levi Ltd | London | 2019 |
| Dolly Productions Ltd | London | 2025 |
| Dolly Shot Ltd | Leeds | 2022 |
| Dolly's Dog Field Ltd | Stanford-Le-Hope | 2018 |
| Dolly's Film Club CIC | Exeter | 2024 |
| Dolly's Funfair Ltd | Maesteg | 2026 |
| Dolo DD Ltd | Newry | 2010 |
| Dolphin Boat Charter Ltd | Fareham | 2016 |
| Dolphin Family Holdings Ltd | Nottingham | 2017 |
| Dolphin Motor Club (Newbury) Limited | Newbury | 1985 |
| Dolphin Sub-Aqua Limited | Belfast | 2010 |
| Dolphin Swim School Caerphilly Limited | Ystrad Mynach | 2010 |
| Dolphin Swim School Ltd | Croydon | 2000 |
| Dolphina Gymnastic Centre Ltd | Watford | 2013 |
| Dolphins Holdings Limited | Yeovil | 2022 |
| DOM Booth Music Limited | London | 2022 |
| DOM Breed Fitness Ltd | Stockport | 2023 |
| DOM Chester Sound Ltd | Chichester | 2018 |
| DOM Coyote Productions Ltd | Market Harborough | 2012 |
| DOM Hills Health Ltd | Norwich | 2019 |
| DOM Joel Tattoo Ltd | Braunton | 2023 |
| DOM Jones Composer Limited | Altrincham | 2024 |
| DOM Martin Music Ltd | Stevenage | 2022 |
| DOM Nicole Absolute Fitness Limited | Leicester | 2021 |
| DOM Thomas Soccer School Ltd | Cambuslang | 2019 |
| DOM Townsend Ltd | Liverpool | 2025 |
| DOM Wells Personal Training Limited | Peterborough | 2021 |
| DOM Whiting Ltd | Welwyn Garden City | 2022 |
| DOM Wilson Design Limited | Hull | 2014 |
| Dom'Z Ltd | London | 2013 |
| Doma (MK) Ltd | Haslemere | 2025 |
| Doma Golf UK Ltd | London | 2018 |
| Domain Assets Limited | Rochdale | 2005 |
| Domain Fitness Limited | Coventry | 2026 |
| Domalos Enterprises Limited | Epsom | 2014 |
| Dome Digital & Publishing Ltd | London | 2016 |
| Dome Music Publishing Limited | London | 2003 |
| Dome Tufnell Ltd | London | 2026 |
| Domenica DE Ferranti Ltd | London | 2023 |
| Domenicoacqua Limited | London | 2013 |
| DOMIN8 Academy Ltd | Birmingham | 2024 |
| DOMIN8LIFE Ltd | Wigan | 2025 |
| Dominantly Music Limited | London | 2019 |
| Dominator Ltd | Waterlooville | 2018 |
| Domingo Jones Ltd | Ashby-De-La-Zouch | 2011 |
| Dominic Farlam Photography Ltd | London | 2012 |
| Dominic Halpin Limited | Stalybridge | 2022 |
| Dominic Holland Limited | Kingston Upon Thames | 2004 |
| Dominic Hyman Ltd | Watlington | 2011 |