| Dilly Dally Cafe Ltd | London | 2017 |
| Dilly Tally Ltd | Uxbridge | 2025 |
| Dilton Edtech UK Limited | London | 2021 |
| Dilworth House C.I.C. | London | 2024 |
| Dilwyn Playgroup | Hereford | 2009 |
| Dime Development C.I.C. | Harrow | 2024 |
| Dimensional Consultancy Ltd | London | 2018 |
| Dimensions Curriculum Ltd. | Preston | 2011 |
| Dimitri Scarlato Ltd | London | 2021 |
| Dimitri Tiomkin Music | London | 2016 |
| Dimples Day Nursery Limited | Green Road, Darenth | 2003 |
| Dimples Group Limited | Middlesbrough | 2020 |
| DIN Din's C-29 Ltd | London | 2019 |
| DIN Driving School Ltd | Morden | 2019 |
| Ding Learning Limited | Thame | 2020 |
| Dingar Education Ltd | London | 2026 |
| Dingbatt Dog Training Limited | Taunton | 2023 |
| Dingley Family and Specialist Early Years Centres | Newbury | 2010 |
| Dink Media Production London Ltd | London | 2013 |
| Dink Pickleball Academy Limited | Brighton | 2025 |
| Dinky Daycare and Holiday Club Ltd | Dewsbury | 2023 |
| Dinky Dolphins Limited | Newark | 2015 |
| Dinnington Area Regeneration Trust Limited | Sheffield | 1998 |
| Dinnington Pre-School Ltd | Dinnington | 2000 |
| Dino Driving School Ltd | London | 2022 |
| Dinosauria Limited | Newcastle Upon Tyne | 2015 |
| Dinosaurs and Dragons Ltd | Crawley | 2023 |
| Dinotots Ashington Ltd | London | 2024 |
| Dino’S Nursery and Preschool Limited | Crewe | 2023 |
| Dinst Ltd | London | 2025 |
| Dinwoodie Charitable Company | Sheffield | 2013 |
| DIO Ansa UK Limited | Coventry | 2019 |
| DIO Flam Education Ltd | London | 2026 |
| Diocese BI C.I.C. | Bedford | 2025 |
| Diocese of Chichester Academy Trust | Eastbourne | 2014 |
| Diocese of Dunkeld (Nominees) Limited | Dundee | 2019 |
| Diocese of Hallam Schools' Partnership | Sheffield | 2012 |
| Diocese of Hereford Multi Academy Trust | Ludlow | 2013 |
| Diocese of Lichfield Education Trust Ltd | Lichfield | 2012 |
| Diocese of Norwich Education Services Company Ltd | Dereham | 2019 |
| Diocese of Salisbury Academy Trust | Salisbury | 2013 |
| Diocese of Southwell and Nottingham Multi-Academy Trust | Southwell | 2013 |
| Diocese of ST Albans Multi-Academy Trust | Luton | 2016 |
| Dionne Deans Limited | Ilfracombe | 2008 |
| Diower's Tutoring Ltd | Bury St. Edmunds | 2026 |
| DIP N Dive Ltd | Coulsdon | 2024 |
| Dipism Ltd | Huddersfield | 2024 |
| Diplomat Admissions UK Ltd | London | 2023 |
| Diplomatic Academy Limited | London | 2016 |
| Diplomatika Ltd | Ipswich | 2025 |
| Dipont International Limited | London | 2025 |
| Dippers and Divers Ltd | Wantage | 2020 |
| Dipsy Dragon CYF | Dolgellau | 2017 |
| Direct 2U Training & Consultancy Limited | Caerphilly | 2014 |
| Direct ABA Limited | Newquay | 2025 |
| Direct Action Training Ltd. | Sheffield | 2007 |
| Direct Answers Limited | Colchester | 2015 |
| Direct Education Services Ltd | Taunton | 2023 |
| Direct Educational Consultancy Limited | Chelmsford | 2024 |
| Direct English Limited | Sutton | 2009 |
| Direct Excellence Limited | Stevenage | 2025 |
| Direct Fitness UK Limited | Sunderland | 2016 |
| Direct Forklift Training Ltd | London | 2019 |
| Direct Impact Solutions Ltd | Bromley | 2001 |
| Direct Learn Driving School Limited | Manchester | 2023 |
| Direct Management Training Limited | Sudbury | 2011 |
| Direct Movement Limited | Hull | 2019 |
| Direct National Independent Security Ltd | London | 2022 |
| Direct Partners Limited | Edinburgh | 2003 |
| Direct Resilience Training Solutions Limited | Huddersfield | 2026 |
| Direct Route Driving School Ltd | Falkirk | 2026 |
| Direct Services Group Limited | London | 2019 |
| Direct Sports Coaching Ltd | Huddersfield | 2022 |
| Direct Stars Ltd | Orpington | 2023 |
| Direct Supply Teachers Limited | London | 2015 |
| Direct Tech Training Scotland Ltd | Edinburgh | 2023 |
| Direct Training (G.B.) Limited | Eckington | 2001 |
| Direct Training (NW) Ltd | Skelmersdale | 2012 |
| Direct Training Consultancy Ltd | Sheffield | 2012 |
| Direct Training Solutions Ltd | Rochester | 2001 |
| Direct Tuition Limited | Leicester | 2008 |
| Direction Aligned Limited | London | 2024 |
| Direction Learning Ltd | Wokingham | 2021 |
| Direction Training Associates Ltd | Wokingham | 2012 |
| Directional Scholars Programs Ltd | Leicester | 2024 |
| Directions Coaching Ltd | Wimborne | 2016 |
| Directions Dance Community Interest Company | Scunthorpe | 2013 |
| Directions IAG Limited | Leigh On Sea | 2011 |
| Directive Training Limited | Hull | 2016 |
| Directly Actors Ltd | London | 2026 |
| Directorate of Heritage Language Education CIC | London | 2025 |
| Directskills Ltd | 46 Orchard Pl | 2024 |
| Dirie Tuition Ltd | London | 2015 |
| Dirosa Consulting Limited | Bradford | 2018 |
| Disability Equality Scotland | Edinburgh | 2003 |
| Disability Experts CIC | Swindon | 2016 |
| Disability Football Collective CIC | Basingstoke | 2022 |
| Disability Opportunities in Sport UK (Dosportuk) CIC | Stockport | 2017 |
| Disability Together Limited | Exeter | 2003 |
| DISABILITY2DRIFT CIC | Reigate | 2026 |