| Dyer Management Co. Limited | Bury St. Edmunds | 2024 |
| Dyggor-Gaylord Limited | Watford | 1966 |
| Dyke & Dryden Limited | Watford | 1988 |
| Dykefield Avenue 1965 Limited | Newcastle Upon Tyne | 2014 |
| Dykkinoreg Limited | London | 2011 |
| DYL Helicopter FLY Limited | London | 2020 |
| Dylan Group Limited | Midhurst West Sussex | 2015 |
| Dylan LEO Stanford Ltd | Tonbridge | 2024 |
| Dylan Michael Smith Limited | Kington | 2026 |
| Dylan Thomas Limited | Pembrokeshire | 2004 |
| Dylan Thomas Literary Works Limited | Rhosneigr | 2018 |
| Dymax Engineering Ltd | Watton | 2009 |
| Dymet Alloys Limited | Nr Aldershot | 1952 |
| Dymo Limited | Harrogate | 2011 |
| Dymon Limited | Tamworth | 1998 |
| Dynablok Limited | London | 2004 |
| Dynaboard Ltd | Glenrothes | 2023 |
| Dynaco Doors Limited | York | 2012 |
| Dynagroup Ltd | Newmarket | 2018 |
| DYNAM1TE Limited | Harrogate | 2021 |
| Dynamic Angling Products Ltd | Evesham | 2022 |
| Dynamic Building Group Ltd | Wigan | 2022 |
| Dynamic Carer Manchester Limited | Oldham | 2023 |
| Dynamic Chemicals Limited | Bury St. Edmunds | 2024 |
| Dynamic Clean Maintenance Group Ltd | Manchester | 2026 |
| Dynamic Clean Pros Ltd | Manchester | 2026 |
| Dynamic Crypto Management Ltd | Port Talbot | 2023 |
| Dynamic Daily Care Pros Ltd | Manchester | 2026 |
| Dynamic Daily Pros Ltd | Manchester | 2026 |
| Dynamic Delivery Pros Ltd | Manchester | 2026 |
| Dynamic Estate Management Ltd | Port Talbot | 2023 |
| Dynamic Finance Limited | London | 2007 |
| Dynamic for International Services Limited | Manchester | 2026 |
| Dynamic Globle Ltd | Beckenham | 2017 |
| Dynamic Growth Advisors for Services Ltd | Manchester | 2026 |
| Dynamic Growth Investment Team Ltd | Manchester | 2026 |
| Dynamic Health and Performance Ltd | Barnsley | 2025 |
| Dynamic Hydro Limited | Wirral | 2022 |
| Dynamic LED Solutions Ltd | Troon | 2025 |
| Dynamic Positioning & Marine Assurance Consultants Limited | Liverpool | 2019 |
| Dynamic Pro Care Experts Ltd | Manchester | 2026 |
| Dynamic Studio Limited | Halesworth | 2021 |
| Dynamic Thought Limited | Polegate | 2017 |
| Dynamic Tire Co., Limited | London | 2005 |
| Dynamic Top Service Experts Ltd | Manchester | 2026 |
| Dynamic Top Services Ltd | Manchester | 2026 |
| Dynamic Trading Group Ltd | Port Talbot | 2023 |
| Dynamicdazzle Sports Ltd | London | 2026 |
| Dynamis Security Solutions Limited | Manchester | 2007 |
| Dynamodazzle Events Ltd | London | 2026 |
| Dynamodive Sports Ltd | London | 2026 |
| Dynas Investments Limited | Ipswich | 2021 |
| Dynashield Limited | London | 2004 |
| Dynasty Uxbridge Limited | Colindale | 2018 |
| Dynatek UK Limited | Chesterfield | 2023 |
| Dynavour Care Services Limited | Gloucester | 2009 |
| Dynawall Limited | London | 2023 |
| Dynax Detailing Company Limited | London | 2019 |
| Dynetek Limited | Essex | 2021 |
| Dyno Files Ltd | Carluke | 2026 |
| Dyserth Garage Limited | Dyserth | 1965 |
| Dysk Air Conditioning Limited | Watford | 2017 |
| Dyslexia Centre North West Ltd | Preston | 2018 |
| Dyslexia Results Limited | Liversedge | 2016 |
| Dyson Property Group Limited | Leeds | 2023 |
| Dyson Recycling Limited | East Sussex | 2005 |
| Dyson Richards Limited | Sutton Coldfield | 1925 |
| Dyson Tech Ltd | Harrogate | 2013 |
| Dysoul Tech Ltd | London | 2022 |
| Dystopian Disco Ltd | Isleworth | 2017 |
| Dywaj Ltd | Birmingham | 2016 |
| DZC Yachting Limited | London | 2026 |
| Dzinr Limited | Stockport | 2012 |
| DZL Construction Limited | Leighton Buzzard | 2019 |
| D£Al Ltd | Harrogate | 2015 |
| Dædalus Historic Building Repair Ltd | Yeovil | 2016 |
| Dêmos HR Solutions Limited | Manchester | 2017 |
| Düdar Ltd | Wirral | 2021 |
| E & a Property Maintenance Ltd | Waterlooville | 2015 |
| E & a Rushton & Sons Limited | Walsall | 2018 |
| E & AJ Robertson Limited | Duns | 2015 |
| E & C Investments Limited | London | 2007 |
| E & C S Limited | Surrey | 2005 |
| E & E Barton Holdings Limited | Openshaw | 2021 |
| E & E Jones Limited | Burry Port | 2016 |
| E & F Plumbing Contractors Limited | Rotherham | 2004 |
| E & H Property Holdings Limited | Manchester | 2019 |
| E & S Facilities Ltd | Basildon | 2011 |
| E & V Sweden Limited | London | 2020 |
| E & W E Carpets Limited | Worcestershire | 2004 |
| E 4 Grid Ltd | Stockport | 2022 |
| E a Consultant Ltd | West Yorkshire | 2006 |
| E a Fixings Limited | Newbury | 2010 |
| E a Hart Limited | Doncaster | 1987 |
| E Accounting Ltd | London | 2002 |
| E and I Investments (Scotland) Limited | Glasgow | 2019 |
| E B Janes Limited | Newton Abbot | 2017 |
| E Blog Ltd | Harrogate | 2012 |
| E BOY Ltd | Harrogate | 2012 |
| E Bygg OG MAX Maling Limited | London | 2023 |