| D & G Italia Limited | Hospitality | 2012 |
| D & L Developments Limited | Construction | 2014 |
| D & M Dorset Limited | Hospitality | 2010 |
| D & N Hospitality Limited | Hospitality | 2023 |
| D & S 717 Ltd | Hospitality | 2025 |
| D & S Canopies Limited | Manufacturing | 2026 |
| D a Services (Holdings) Limited | Professional & scientific | 2006 |
| D a Services (Yeovil) Limited | Construction | 1999 |
| D Foreman Limited | Professional & scientific | 2009 |
| D J Transport & Installations Limited | Construction | 2002 |
| D L Complete Refurbishments Limited | Construction | 2014 |
| D L Crease Limited | Construction | 2002 |
| D L Roof Sheet Supplies Limited | Wholesale & retail | 2014 |
| D R Jones Yeovil Ltd. | Construction | 1993 |
| D&M Dorset (Holdings) Limited | Financial services | 2022 |
| D'Winter Portfolio Limited | Real estate | 2015 |
| D. Brice Ltd | Administrative & support | 2019 |
| D.A.N.A1 Limited | Health & social care | 2023 |
| D.Elbouni Ltd | Health & social care | 2023 |
| D.I Primecare Ltd | Health & social care | 2018 |
| DA, CMJ & LA Tottle Limited | Agriculture & fishing | 2010 |
| DAC Services Limited | Professional & scientific | 1999 |
| Daddy's Superyacht Productions Ltd. | Information & communication | 2020 |
| Dahlia Florists Ltd | Wholesale & retail | 2021 |
| Dalziel Construction Group Ltd | Construction | 2026 |
| Damers Lodge Management Ltd | Real estate | 2019 |
| DAN Atkins Filmmaker Limited | Information & communication | 2021 |
| DAN Neil Television Limited | Information & communication | 2019 |
| Dandelion Cotton Ltd | Manufacturing | 2020 |
| Danelm Ltd | Real estate | 2018 |
| Darymax Ltd | Administrative & support | 2017 |
| DAS Excavators Ltd | Wholesale & retail | 2023 |
| Datan Marine Services Limited | Professional & scientific | 2017 |
| Dataologi Ltd | Information & communication | 2013 |
| Dave Creed & Sons Ltd | Agriculture & fishing | 2010 |
| Dave the Painter Limited | Construction | 2007 |
| Davenport Western Limited | Manufacturing | 1995 |
| Davey Roofing Southern Limited | Construction | 2013 |
| David Bardgett Limited | Wholesale & retail | 2001 |
| David Keith Hair Design Limited | Other services | 2002 |
| Davis Automotive Logistics Ltd | Transport & logistics | 2019 |
| Davis Pubs Ltd | Extraterritorial | 2021 |
| Davis Sports Management Limited | Arts & recreation | 2021 |
| Dcblag UK Ltd | Health & social care | 2026 |
| DCW Transport Limited | Transport & logistics | 2004 |
| Ddvm Ltd | Wholesale & retail | 2018 |
| Dea-Lightful Cleaning Services Limited | Administrative & support | 2023 |
| Dean Kirkland Limited | Construction | 2003 |
| Deep Roots Habitat Limited | Professional & scientific | 2026 |
| Defence Support Optimisation Ltd | Professional & scientific | 2022 |
| Dekeyser Developments and Properties Ltd | Real estate | 2016 |
| Delor+ Ltd | Wholesale & retail | 2025 |
| Delta Aircraft Services Limited | Manufacturing | 1989 |
| Democracy Radio Ltd | Information & communication | 2023 |
| DEN of Iniquity Limited | Arts & recreation | 2002 |
| Dene Court Care Home Limited | Health & social care | 2018 |
| Denholm Industrial Services Limited | Construction | 1974 |
| Denholm Marine Limited | Extraterritorial | 2024 |
| Denholm Marine Services Limited | Extraterritorial | 2024 |
| Denholm Universal Limited | Manufacturing | 1999 |
| Dental Insurance Agency Limited | Extraterritorial | 2001 |
| Derek J Read Limited | Professional & scientific | 1985 |
| Desert to Jungle Limited | Wholesale & retail | 2022 |
| Desertmist Limited | Other services | 2001 |
| Designmeasure Limited | Professional & scientific | 2021 |
| Dewey Contracting Limited | Agriculture & fishing | 1997 |
| Dextay Inns Ltd | Hospitality | 2025 |
| Diamond CUT Refinishing Solutions Ltd | Administrative & support | 2018 |
| Diamond Decorators Yeovil Ltd | Construction | 2019 |
| Diamond Laundry Yeovil Wash Ltd | Administrative & support | 2024 |
| Dickie Dyer Limited | Manufacturing | 2017 |
| Dicta Consulting Ltd | Transport & logistics | 2018 |
| Digi Home Technology Limited | Information & communication | 2020 |
| Digital Layout Solutions Ltd | Manufacturing | 2026 |
| Dilram Ltd | Wholesale & retail | 2022 |
| Dimond Farming Limited | Agriculture & fishing | 2013 |
| Dirtydayz Limited | Administrative & support | 2024 |
| Dive Academy Ltd | Wholesale & retail | 2007 |
| Divelements Limited | Information & communication | 2004 |
| Divine Domestic Services Limited | Administrative & support | 2014 |
| Dixonservers Ltd | Information & communication | 2025 |
| Dizzy COW Productions Limited | Administrative & support | 2004 |
| DJB Homes Limited | Real estate | 2017 |
| DJT Driver Services Somerset Limited | Transport & logistics | 2021 |
| DLP Services Ltd | Administrative & support | 2024 |
| DMI Network Solutions Ltd | Information & communication | 2024 |
| DNA Scaffolding Southwest Limited | Construction | 2015 |
| DNP Plumbing and Heating Services Limited | Construction | 2015 |
| DNR Yeovil Ltd | Wholesale & retail | 2017 |
| Dockray Farming Limited | Agriculture & fishing | 2005 |
| Docrahat Consults Ltd | Health & social care | 2026 |
| Dodds Enterprises Limited | Hospitality | 2023 |
| Dog LUV Kennels Ltd. | Agriculture & fishing | 2016 |
| Dolphin Hotel Whitewalls Ltd | Hospitality | 2012 |
| Dolphin House Apartments Limited | Construction | 2025 |
| Dolphins Holdings Limited | Arts & recreation | 2022 |
| Domforus Ltd | Real estate | 2024 |
| Donovan Joinery and Kitchens Ltd | Manufacturing | 2024 |
| Door Central Ltd | Construction | 2020 |
| Dorchester Care Homes Holding Limited | Financial services | 2023 |