| Dickov Football Academy CIC | Livingston | 2024 |
| Dicky Birds PRE School Nurseries Limited | Basingstoke | 1998 |
| DICTIONARY4LIFE C.I.C. | Coulsdon | 2025 |
| DID (Scot) Ltd | Glasgow | 2026 |
| Didac Limited | Bristol | 1997 |
| Didac Schools Limited | Eastbourne | 1999 |
| Didactic MGT Ltd | London | 2025 |
| Didakta Ltd | Southampton | 2022 |
| Didasko Education Company Limited | Edinburgh | 2008 |
| Didasko Ltd | London | 2025 |
| Didcot Boxing Academy Ltd | Didcot | 2021 |
| Diddi Drama Ltd | Ellesmere Port | 2018 |
| Diddikicks Yorkshire Limited | Leeds | 2016 |
| Diddle DEE DUM Ltd | London | 2026 |
| Diddu Communications Ltd | Nottingham | 2017 |
| Diddy Dunkers Ltd | Camberley | 2021 |
| Diddydots Ltd | Southminster | 2025 |
| Didi Finanças NO UK Ltd | London | 2023 |
| Didi Leicester Limited | Loughborough | 2020 |
| Didi Rugby Midlands Limited | Hinckley | 2016 |
| Didi Rugby South Glos Ltd | Oldbury-On-Severn | 2023 |
| Didomi Education Ltd | London | 2025 |
| Didsbury Childminding Limited | Manchester | 2015 |
| Didsbury Theatre School Ltd | Manchester | 2009 |
| Didsbury Tutoring Hub Limited | Manchester | 2025 |
| Diego Day Ltd | London | 2023 |
| Dienvidanglijas Luterāņu Draudze Community Interest Company | Southsea | 2026 |
| Diesel AK CIC | London | 2023 |
| Dietetics Academy Ltd | London | 2025 |
| Dietl Education Centre UK Limited | Nottingham | 2019 |
| Diffability Driving Limited | Leicester | 2024 |
| Differabled C.I.C. | Glasgow | 2024 |
| Difference a Day Makes Limited | London | 2009 |
| Differences NOT Disabilities Support CIC | Ashford | 2026 |
| Differencesnotdisabilities Ltd | Ashford | 2024 |
| Different Art Centre UK Chapter CIC | London | 2025 |
| Different Breed Coaching Ltd | Cardiff | 2024 |
| Different by Design Collective CIC | Essex | 2025 |
| Different Class Ltd | Bromley | 2019 |
| Different Level CIC | London | 2024 |
| Different Perspective Training Ltd. | Hungerford | 2017 |
| Different Space Ltd | Bristol | 2002 |
| Different Steps CIC | Buckingham | 2025 |
| Different Women Project Ltd | London | 2022 |
| Differential Limited | Mildenhall | 2025 |
| Differentiation Academy Limited | Staines-Upon-Thames | 2025 |
| DIG Cat Dog Limited | Cheltenham | 2017 |
| DIG Deep Education Ltd | Stoke-On-Trent | 2019 |
| DIG Where YOU Stand C.I.C. | Sheffield | 2024 |
| DIG1T Games Ltd | Harrow | 2014 |
| Digbeth College Limited | Birmingham | 2025 |
| Digger Girl Training Ltd | Glasgow | 2022 |
| Diggers Club Ltd | Petersfield | 2014 |
| Diggertraingandtesting Limited | Abergavenny | 2025 |
| Diggertraining Ltd | Abergavenny | 2018 |
| Diggiecorp Ltd | London | 2025 |
| Digging Deep CIC | Swansea | 2023 |
| Digging Deeper Insights Limited | London | 2024 |
| Diggle Day Nursery & Education Centre Ltd | Manchester | 2012 |
| Diggory's Day Nursery Limited | Retford | 2021 |
| Diggy Sticks Community Woodland Centre CIC | Preston | 2018 |
| Digibrite Education Ltd | London | 2022 |
| Digicomp Solutions Ltd. | Loughton | 2018 |
| Digiforma Limited | London | 2025 |
| Digigen Group Ltd | London | 2026 |
| Digilearn Ltd | Luton | 2020 |
| Digipath Academy Ltd | Cardiff | 2020 |
| Digiqual Limited | London | 2025 |
| Digischool Ltd | Broxbourne | 2022 |
| Digismiles Ltd | Alfreton | 2023 |
| Digispark Reaction CIC | Craigavon | 2025 |
| Digisteamz Ltd | Mildenhall | 2026 |
| Digistepz CIC | Coventry | 2023 |
| Digital Academic Ltd | Bargoed | 2023 |
| Digital Academy of Dental Sciences Ltd | Peterborough | 2022 |
| Digital Access Network CIC | Tain | 2026 |
| Digital and Leadership Learning Consultancy Ltd | Alderley Edge | 2025 |
| Digital and Training Services Ltd. | Gloucester | 2016 |
| Digital Anthropology Limited | London | 2020 |
| Digital Arena Group Ltd | Winsford | 2025 |
| Digital Artifacts Limited | London | 2021 |
| Digital Arts Box CIC | Bootle | 2016 |
| Digital Assess Software Limited | Eastleigh | 2016 |
| Digital Automation Training Limited | Oldham | 2003 |
| Digital Axiss Ltd | Manchester | 2024 |
| Digital Body Productions Ltd | London | 2023 |
| Digital Boost Upskilling Ltd | London | 2016 |
| Digital Bricks Limited | Edinburgh | 2020 |
| Digital Business by HER Ltd | Cardiff | 2025 |
| Digital Business School Ltd | London | 2022 |
| Digital Citizen Academy Ltd | Merthyr Tydfil | 2025 |
| Digital Commonwealth Limited | London | 2020 |
| Digital Communities Connect CIC | Wirral | 2024 |
| Digital Compliance Training Limited | North Grimston | 2019 |
| Digital Concepts for Schools Limited | Kington | 2024 |
| Digital Content and Learning Ltd | Brighton | 2010 |
| Digital Creatives (North East) Limited | Stockton On Tees | 2015 |
| Digital Credentials Limited | Beaumaris | 2021 |
| Digital Data Core Ltd | London | 2025 |
| Digital Delivery Academy Ltd | Clitheroe | 2026 |