| 3D Financial Ltd | London | 2018 |
| 3D Fire Inspections Ltd | Hinckley | 2025 |
| 3D FX Design Limited | Leamington Spa | 1989 |
| 3D Geomatics Surveys Ltd | London | 2021 |
| 3D Global Consulting Ltd | London | 2018 |
| 3D Ground Scanning Surveys Ltd | Chester | 1997 |
| 3D Hire Hub Ltd | Ramsgate | 2023 |
| 3D Hub Ltd | London | 2022 |
| 3D Images Limited | Hockley | 2025 |
| 3D IND Design Limited | Dudley | 2023 |
| 3D Industrial Limited | Rochdale | 2018 |
| 3D Infrastruct Ltd | Bury St. Edmunds | 2020 |
| 3D Insight BIM Ltd | Billericay | 2020 |
| 3D Instruments Limited | Thetford | 1992 |
| 3D Interation Ltd | Chobham | 1991 |
| 3D Laboratories Ltd | Blackburn | 2024 |
| 3D Leadership Ltd | Wilden | 2015 |
| 3D Learning Limited | Westerham | 2000 |
| 3D Lines Design Ltd | Bedford | 2020 |
| 3D Lipo & Aesthetics South Ltd | London | 2024 |
| 3D Lipo Brighton Ltd. | London | 2018 |
| 3D Marketing Communication Ltd | Southampton | 2025 |
| 3D Measure Limited | Warwick | 2003 |
| 3D Mech Designs Ltd. | Weybridge | 2018 |
| 3D Mechanical Innovation Limited | Buckinghamshire | 2005 |
| 3D Mechpipe Limited | Manchester | 2022 |
| 3D Media Design Limited | Chippenham | 1996 |
| 3D Media Solutions Limited | Werherby | 2017 |
| 3D MEP Ltd | Cheadle Hulme | 2022 |
| 3D Metrology Ltd | Nantwich | 2021 |
| 3D Metrology Solutions Ltd | Rhyl | 2022 |
| 3D Models Scotland Limited | Prestwick | 2013 |
| 3D Morphosis Ltd | Haywards Heath | 2007 |
| 3D Nova Ltd | Ruislip, London | 2024 |
| 3D Perspective Ltd | Cheltenham | 2025 |
| 3D Pharma Consulting Ltd | Cardiff | 2019 |
| 3D Planning Design (Maidstone) Ltd | West Malling | 2021 |
| 3D Planning Design (Sidcup & Dorking) Ltd | West Malling | 2023 |
| 3D Planning Design (South London) Ltd | West Malling | 2023 |
| 3D PMS Limited | London | 2021 |
| 3D Precision Engineering Limited | Kirkcaldy | 2005 |
| 3D Precision Limited | Buxton | 2020 |
| 3D Print Core Ltd | Chesham | 2026 |
| 3D Printed Products Ltd. | Preston | 2019 |
| 3D Printerly Ltd | London | 2021 |
| 3D Printers Online Store Ltd | London | 2019 |
| 3D Projects (UK) Limited | Wotton-Under-Edge | 2009 |
| 3D Property Tours Limited | Stourbridge | 2019 |
| 3D Quality Assurance Limited | Derby | 2009 |
| 3D Quality Services Limited | Derby | 2025 |
| 3D Rail Services Limited | Gravesend | 2023 |
| 3D Rigging and Lifting Ltd | Middlesbrough | 2025 |
| 3D Rigging Ltd | Pinner | 2021 |
| 3D Safety Management Ltd | Boston | 2018 |
| 3D Scan Solutions Limited | Derby | 2011 |
| 3D Scan Studios Limited | London | 2023 |
| 3D Scanning Solutions Ltd | Cannock | 2021 |
| 3D Scanworx Limited | Crewe | 2014 |
| 3D Services (South East) Ltd | Godalming | 2011 |
| 3D SET Company Limited | Manchester | 2002 |
| 3D Site Engineering Limited | Wrexham | 2014 |
| 3D Solicitors Ltd. | Manchester | 2017 |
| 3D Solid Designs Limited | Cambridgeshire | 1982 |
| 3D Steels Ltd | Caterham | 2013 |
| 3D Strategic Communications Ltd | London | 2018 |
| 3D Structural Detailing Ltd | East Calder | 2017 |
| 3D Structural Services Limited | Dudley | 2008 |
| 3D Surveying Limited | Banbridge | 2015 |
| 3D Surveying Solution Ltd | Altrincham | 2025 |
| 3D Surveys Consulting Limited | West Malling | 2013 |
| 3D Synergy Ltd | Cardiff | 2022 |
| 3D Technical Design Limited | Milton Keynes | 1992 |
| 3D Technical Solutions Limited | Warrington | 2008 |
| 3D Technologies Limited | Warwick | 2014 |
| 3D Tool Design and Components Limited | Chinnor | 2015 |
| 3D Tool Design Ltd | Swansea | 2016 |
| 3D Tool Ltd | West Midlands | 2007 |
| 3D TV Limited | Totnes | 1998 |
| 3D Virtual Solutions Limited | Radstock | 2017 |
| 3D Visco Studio Limited | London | 2015 |
| 3D Visionworks Ltd | St. Albans | 2010 |
| 3D Visual Communications Ltd | Altrincham | 2013 |
| 3D Visuals Ltd | Skelmersdale | 2022 |
| 3D Wedding Figures Ltd | Southampton | 2015 |
| 3D Wise Ltd | Chipping Norton | 2019 |
| 3D Work (Hampshire) Limited | Havant | 2010 |
| 3D'S Training UK Limited | Portsmouth | 2013 |
| 3D-LAYER Ltd | Poole | 2025 |
| 3D-M - the 3D Mouse Company Limited | Telford | 1995 |
| 3D-OSCOPY Ltd | Milton Keynes | 2017 |
| 3D-R Architectural & MEP BIM Services Ltd | London | 2021 |
| 3D-THINKING Limited | London | 1996 |
| 3D.G Design Ltd | Leyland | 2010 |
| 3D2 Design Ltd | Belfast | 2020 |
| 3D360TOUR Limited | Swansea | 2018 |
| 3D7 Technologies Ltd | Manchester | 2015 |
| 3D8 Ltd. | Glasgow | 2004 |
| 3DASSURANCE Ltd | Bury St. Edmunds | 2016 |
| 3DBCONSULTING Ltd. | Ringwood | 2011 |
| 3DBITS Ltd | Warrington | 2020 |