| Dartmoor Health Limited | Moretonhampstead | 2023 |
| Dartmouth Propcos CC Limited | London | 2022 |
| Dartmouth Village Limited | London | 2013 |
| Darts Reviews TV Limited | Diss | 2020 |
| Darts Team Limited | Preston | 2025 |
| Dartsat Homes Limited | Manchester | 2025 |
| Dartsbell Limited | Manchester | 2025 |
| Dartsworld Media Ltd | Peterborough | 2026 |
| Darussalam Publishers Limited | Birmingham | 2013 |
| Darway Limited | Cambridge | 2022 |
| Darwin (Seaview Gwespyr) Limited | Talacre | 2011 |
| Darwin Investments Limited | Stanmore | 1959 |
| Darwin Miekle Ltd | Stewarton | 2017 |
| Darwin Science Park Limited | Shrewsbury | 1902 |
| Darwinian Voodoo Ltd | London | 2016 |
| Darya Noor Limited | Stroud | 2026 |
| DAS Analytics & Consultancy Ltd | Bexley | 2022 |
| DAS Aviation Solutions Ltd. | Keighley | 2014 |
| DAS Haus Limited | Lincoln | 2014 |
| DAS Lite Ltd | Lincoln | 2023 |
| DAS Manufacturing Services Ltd | Aylesbury | 2019 |
| DAS World Ltd | Lincoln | 2023 |
| Dash Packing Limited | Somerset | 1999 |
| Dasha Karzunina Ltd | London | 2021 |
| Dashbard Ltd | London | 2026 |
| Dashboard Limited | Exeter | 2022 |
| Dashboard.Diagnostics Ltd | Manchester | 2026 |
| Dashdivide Limited | Glasgow | 1993 |
| Dashend 21971 Limited | Ely | 2013 |
| Dashiqiao Jiasheng Science and Technology Co., Ltd | Cambridge | 2019 |
| Dashman Ltd | Dinas Powys | 2012 |
| Dashwood Design Ltd | Sheffield | 2021 |
| Dashwoods Limited | High Wycombe | 2020 |
| Dassett View Estates Limited | Gaydon | 2014 |
| Dassia Limited | Poole | 2015 |
| Dasu Engineering Limited | Chesterfield | 2011 |
| Dasu Limited | Chesterfield | 2011 |
| Data Capital Ltd | Highgate | 2015 |
| Data Centre Consulting Ltd | Nutley | 2023 |
| Data Clarity Solutions Limited | Irby | 2019 |
| Data Contracts Specialist Maintenance Limited | Walsall | 2001 |
| Data Driven Telematics Ltd | Birmingham | 2006 |
| Data Duplication Limited | Princes Risborough | 2013 |
| Data Fakts Ltd | Skelmorlie | 2019 |
| Data for Good Ltd | Gaerwen | 2016 |
| Data Harvest Limited | Leighton Buzzard | 1982 |
| Data Image Systems Limited | Leicester | 1998 |
| Data Installation & Networking Services Limited | London | 1993 |
| Data Locator Limited | Ross-On-Wye | 2004 |
| Data Management Services Group Limited | London | 1995 |
| Data Monster Limited | Sheffield | 2008 |
| Data Nominees Limited | Salford | 2006 |
| Data Planning Ltd | Leigh-On-Sea | 2012 |
| Data Privacy Matters Ltd | Norwich | 2020 |
| Data Processes Limited | Egham | 2006 |
| Data Protection Limited | Brighouse | 1994 |
| Data Quick Limited | Rugby | 2013 |
| Data Reply Limited | London | 2018 |
| Data Research Limited | London | 2022 |
| Data Shred Limited | London | 2006 |
| Data Taxies Limited | Carlisle | 2010 |
| Data Tech City Ltd | Windsor | 2019 |
| Data-Track Fuel Systems Limited | Accrington | 1992 |
| DATA2ACTION Ltd | North Shields | 2021 |
| DATA2U Limited | Worthing | 2002 |
| Databanx Limited | Maidenhead | 2003 |
| Database Limited | London | 2023 |
| Databeck Limited | Bridgend | 2026 |
| Datacall Limited | Mitcham | 1960 |
| Datacities Ltd | London | 2020 |
| Datacivil Limited | Coventry | 1996 |
| Datacorp Limited | London | 2011 |
| Datadyne Ltd | London | 2024 |
| Dataevo Ltd | London | 2007 |
| Datafern Limited | Bridgend | 2024 |
| Dataforge Innovations Ltd | London | 2026 |
| Datafrog Limited | Preston | 2021 |
| Datagenie Ltd | Manchester | 2007 |
| Datagraphics Limited | Uckfield | 1984 |
| Dataharbour Analytics Ltd | Doncaster | 2026 |
| Datahigh Limited | Nottingham | 2008 |
| Datainvest Limited | London | 2025 |
| Dataio Limited | Sevenoaks | 2008 |
| Datalgorithm Ltd | Reading | 2015 |
| Datalink Design Limited | Loughborough | 2005 |
| Datament Limited | London | 2023 |
| Datamerse Limited | Chertsey | 2020 |
| Datan Estates Limited | London | 2020 |
| Datanumen Ltd | London | 2025 |
| Datapace Properties Limited | Milton Keynes | 2007 |
| Dataplicity Limited | Oxford | 2013 |
| Datapulse Analytics Limited | London | 2024 |
| Datarider Limited | London | 2022 |
| Datasect Limited | St. Albans | 2024 |
| Datastation Holdings Limited | Haverhill | 2012 |
| Datastream Supplies Limited | Lutterworth | 1983 |
| Dataswift 2000 Limited | Potters Bar | 1996 |
| Datasys Integration Limited | Leeds | 2009 |
| Datatec Holdings Limited | Dudley | 2024 |
| Datatrace Data Recovery Services Limited | Dereham | 2012 |