| Dirdirect Limited | Wholesale & retail | 2019 |
| Direct Alarms & Security Limited | Administrative & support | 2003 |
| Direct Cleaning Facilities Management Ltd | Administrative & support | 2017 |
| Direct Factors Limited | Construction | 1993 |
| Direct Fundraising Ltd | Professional & scientific | 2018 |
| Direct Hiring Solutions Limited | Administrative & support | 2019 |
| Direct Line Marking Ltd | Construction | 2021 |
| Direct New Homes Limited | Real estate | 2014 |
| Direct Properties Management Limited | Households | 2025 |
| Direct Speakers Ltd | Arts & recreation | 2021 |
| DIRECT2YOU Ltd | Transport & logistics | 2026 |
| Directauthors.Com Ltd | Information & communication | 2012 |
| Diron Limited | Hospitality | 2023 |
| Dirty Busters Dorset Ltd | Administrative & support | 2023 |
| Discount Till Rolls Ltd | Wholesale & retail | 2018 |
| Discover Britannia Limited | Wholesale & retail | 2018 |
| Discover Dorset Limited | Transport & logistics | 2006 |
| Discover Human Limited | Information & communication | 2015 |
| Discover Services Limited | Professional & scientific | 2007 |
| Discover SRI Lanka Holiday Limited | Administrative & support | 2025 |
| Discover the Music Ltd. | Education | 2018 |
| Discoveries International Limited | Other services | 1985 |
| Distant Roads Holdings Ltd | Financial services | 2025 |
| Distant Roads Ltd | Information & communication | 2025 |
| Distinctive Exteriors Limited | Construction | 2004 |
| Distribution Pallets Collective Limited | Wholesale & retail | 2020 |
| Distro Works Ltd | Manufacturing | 2023 |
| Dive Host Ltd | Education | 2025 |
| Diversity and Unity Europe Ltd | Wholesale & retail | 2015 |
| Divine Decking Ltd | Construction | 2022 |
| Divine Education Group Limited | Education | 2024 |
| Divine Flavour Cuisine Ltd | Hospitality | 2026 |
| Divine Guardianship Ltd | Other services | 2021 |
| Divine Merchant Limited | Wholesale & retail | 2025 |
| Divinitus Domus Limited | Real estate | 2024 |
| Dixon-Gray Studio Limited | Professional & scientific | 2026 |
| DJ Dolly Limited | Arts & recreation | 2024 |
| DJ Holdings 2025 Ltd | Financial services | 2025 |
| DJA Land & Development Ltd | Professional & scientific | 2023 |
| Djaerovision Ltd | Information & communication | 2026 |
| DJB Aero Tech Ltd | Manufacturing | 2007 |
| Djhannahb Ltd | Professional & scientific | 2019 |
| DJL Heating Ltd | Professional & scientific | 2020 |
| DJM Property Group Ltd | Real estate | 2023 |
| Djpcc Limited | Construction | 2025 |
| DK & UK Convenience Ltd | Wholesale & retail | 2017 |
| DK Caring Service Ltd | Health & social care | 2024 |
| DK Cosmetics Ltd | Other services | 2024 |
| DK Foods Ltd | Wholesale & retail | 2015 |
| DKA Property Investments Ltd | Real estate | 2023 |
| DKB Supplies Ltd | Construction | 2023 |
| DKJ Hair Ltd | Other services | 2024 |
| DL Logistics Ltd | Transport & logistics | 2023 |
| DLB Family Lettings LLP | | 2023 |
| DLB Lettings Limited | Real estate | 2023 |
| DLH Investments Ltd | Real estate | 2023 |
| DLM Active Ltd | Arts & recreation | 2020 |
| DLP Estates Ltd | Real estate | 2018 |
| DLP Nursery Group Ltd | Health & social care | 2020 |
| Dlserve Ltd | Information & communication | 2022 |
| DM Aviation International Ltd | Transport & logistics | 2020 |
| DM Barbering Limited | Other services | 2017 |
| DM Bournemouth Building Services Ltd | Construction | 2020 |
| DM Entertainment International Ltd | Information & communication | 2020 |
| DM General Building Ltd | Construction | 2020 |
| DM Homes Management Limited | Real estate | 2023 |
| DM Motorsport International Ltd | Wholesale & retail | 2020 |
| DM Prime Estates Ltd | Real estate | 2024 |
| DM Transporter Limited | Transport & logistics | 2021 |
| DM2CALLS Ltd | Information & communication | 2026 |
| DMB Building Services Ltd | Construction | 2026 |
| DMC Electrical Contracting Ltd | Construction | 2022 |
| DMC Home Solutions Ltd | Other services | 2020 |
| DMC Services UK Ltd | Information & communication | 2015 |
| DME Trading and Maintenance Limited | Wholesale & retail | 2023 |
| DMG Waste Management Ltd | Water & waste | 2025 |
| DML (Fashion) Ltd | Professional & scientific | 2017 |
| DMR Swanage Limited | Construction | 2020 |
| Dmrc Kebab Limited | Hospitality | 2026 |
| DMS Digital Marketing Solutions Ltd | Professional & scientific | 2022 |
| DND Kearns Ltd | Wholesale & retail | 2020 |
| DNE Plumbing & Heating Limited | Construction | 2024 |
| Dnps Holdings Ltd | Financial services | 2020 |
| DNS Heating &Plumbing Services Ltd | Construction | 2025 |
| Dobe Homes Ltd | Real estate | 2023 |
| Doblebriar Limited | Households | 1991 |
| Dobrogeanca Ltd | Hospitality | 2025 |
| DOC Choc Ltd | Manufacturing | 2024 |
| Dockmasters Ltd | Hospitality | 2023 |
| Doctor Sara Dowsett Limited | Health & social care | 2024 |
| Doctors Mortgages Limited | Financial services | 2021 |
| Docuracy Ltd. | Professional & scientific | 2011 |
| Dodgson Associates Limited | Information & communication | 2012 |
| Dodo Valeting Ltd | Administrative & support | 2022 |
| Dog Advice for YOU Ltd | Other services | 2022 |
| Dog Club CIC | Wholesale & retail | 2020 |
| Dogz Grooming Spa Ltd | Other services | 2021 |
| Dogz Pet Food Ltd | Wholesale & retail | 2025 |
| Dolls & Woofs Limited | Other services | 2025 |
| Dolphin Court (Branksome Park) Limited | Households | 1981 |