| DON Property Services Limited | Real estate | 2024 |
| Donald Istanbul Ltd | Hospitality | 2020 |
| Donfedral Studeos Ltd | Professional & scientific | 2024 |
| Donmac Data Limited | Information & communication | 2017 |
| Donmac Group Limited | Information & communication | 2019 |
| Donna Winning Events Ltd | Other services | 2021 |
| Door 2 Door Dairy Ltd | Wholesale & retail | 2013 |
| Door 22 Limited | Professional & scientific | 2003 |
| Doors and Glass Limited | Construction | 2008 |
| Dope Developments Ltd | Construction | 2024 |
| Dormandy Advisory Limited | Professional & scientific | 2024 |
| Dormington Road 1963 Limited | Extraterritorial | 2015 |
| Dorney Court Management Limited | Hospitality | 1993 |
| Dorset Coastal Living Ltd | Real estate | 2019 |
| Dorset General Practice Alliance C.I.C. | Health & social care | 2025 |
| Dorset Retina Screening Courier Limited | Transport & logistics | 2022 |
| Dorset Trading Ltd | Wholesale & retail | 2023 |
| Dotbasedart Ltd | Arts & recreation | 2024 |
| Dotcompassion Limited | Transport & logistics | 2021 |
| Dotted-I Ltd | Professional & scientific | 2011 |
| Double Brogeys Media Ltd | Information & communication | 2025 |
| Double DJ Ltd | Transport & logistics | 2023 |
| Double Glazing Services Trade Ltd | Construction | 2012 |
| Douglas Medical Services Limited | Health & social care | 2020 |
| Dover & Page Limited | Professional & scientific | 2021 |
| Down Range AXE Throwing Ltd | Arts & recreation | 2023 |
| Down Safe Demolition (UK) Limited | Other services | 2017 |
| Downs IT Consulting Ltd | Information & communication | 2016 |
| Doyle Court (Residents Association) Limited | Hospitality | 1978 |
| Doyle Court Company Limited | Households | 2018 |
| DP Blinds Holdings Ltd | Other services | 2015 |
| DP Blinds Limited | Administrative & support | 2011 |
| DP Distribution Ltd | Wholesale & retail | 2023 |
| DP Preservations & Structural Repairs Ltd | Construction | 2014 |
| DPA Business Services Ltd | Professional & scientific | 2020 |
| DPC Flat Roofing Limited | Construction | 2022 |
| DPC Maintenance Ltd | Construction | 2025 |
| DPL Advisory Ltd | Professional & scientific | 2010 |
| DPS Buildscapes Ltd | Construction | 2024 |
| DPS Emsworth Holdings Limited | Financial services | 2020 |
| DPS Plastering Services Ltd | Construction | 2024 |
| DPX Films Ltd | Information & communication | 2018 |
| DQ Utilities Ltd | Construction | 2020 |
| DR Ardern-Jones Ltd | Health & social care | 2016 |
| DR Choksi Limited | Administrative & support | 2026 |
| DR Chowdhury Medical Services Limited | Health & social care | 2012 |
| DR Ella Seccombe Limited | Health & social care | 2021 |
| DR Elsbeth Dyson Ltd | Health & social care | 2022 |
| DR FAN Consultancy Limited | Information & communication | 2003 |
| DR Fletcher Medical Services Ltd | Health & social care | 2012 |
| DR Hemba Medical Aesthetics Limited | Health & social care | 2021 |
| DR Hemba Medical Limited | Health & social care | 2023 |
| DR Pongratz Consulting Ltd | Health & social care | 2017 |
| DR S Bill Ltd | Health & social care | 2018 |
| DR T Caldas Limited | Health & social care | 2014 |
| DR Vilches Ltd | Health & social care | 2026 |
| DRA Engineer Limited | Professional & scientific | 2025 |
| Dragon Fruit Direct Limited | Wholesale & retail | 2008 |
| Drain Expert Ltd | Water & waste | 2024 |
| Draper's Funfairs Ltd | Arts & recreation | 2025 |
| Drayton Care Ltd | Administrative & support | 2021 |
| Drayton Carpentry & Building Limited | Construction | 2021 |
| Drayton Drainage Services Ltd | Water & waste | 2023 |
| Drayton Medical Services Limited | Health & social care | 2012 |
| Drayton Prime Stores Ltd | Wholesale & retail | 2024 |
| DRB Hosting Ltd | Information & communication | 2019 |
| DRD Property Developments Limited | Financial services | 2024 |
| Dream Builds Construction Ltd | Construction | 2026 |
| Dream Catchers Childcare Ltd | Health & social care | 2017 |
| Dreamery Limited | Health & social care | 2021 |
| Dreamkey Ltd. | Education | 2011 |
| Dreamlands Group Ltd | Wholesale & retail | 2026 |
| Dreamline Southern Limited | Construction | 2019 |
| Dreamrooms (Southern) Limited | Construction | 2023 |
| Dreamtime UK 01 Ltd | Wholesale & retail | 2015 |
| Dressed by B Ltd | Manufacturing | 2020 |
| Drexon Electrical Ltd | Construction | 2024 |
| Drini Limited | Construction | 2016 |
| Drink KAE Ltd | Wholesale & retail | 2025 |
| Drip Hockey Ltd | Wholesale & retail | 2025 |
| Drivana Cars Ltd | Transport & logistics | 2025 |
| Driven Coaching Ltd | Arts & recreation | 2025 |
| Driverledger Limited | Information & communication | 2020 |
| Drives and Patios 123 Ltd | Construction | 2024 |
| Driving Miss Daisy (UK) Ltd | Transport & logistics | 2014 |
| Driving Miss Daisy Limited | Transport & logistics | 2015 |
| DRN Surveyors Limited | Professional & scientific | 2023 |
| Droxford Property Developments Limited | Construction | 2024 |
| Drum Marketing Consultants Limited | Professional & scientific | 2021 |
| DRY Phicks DRY Lining Ltd | Construction | 2014 |
| Drygi Furniture Limited | Wholesale & retail | 2026 |
| Drygiel Limited | Wholesale & retail | 2018 |
| DS BIA Services Ltd | Public administration | 2021 |
| DS Car Wash Ltd | Administrative & support | 2022 |
| DS Cleaning (South) Limited | Administrative & support | 2026 |
| DSB Planning Solutions Limited | Professional & scientific | 2019 |
| Dsdc Healthcare Limited | Health & social care | 2015 |
| DST Consulting Limited | Information & communication | 2019 |
| DT Gardening and Landscaping Ltd. | Construction | 2023 |
| DT Roofing & Leadworks Ltd | Construction | 2023 |