| Dhillon Quest Properties Ltd | Real estate | 2025 |
| Dhillon Quest Ventures Ltd | Financial services | 2026 |
| Dial an Exchange Limited | Professional & scientific | 2002 |
| Dial-Emma Limited | Transport & logistics | 2015 |
| Diamon.Service. Ltd | Construction | 2025 |
| Diamond Adventure Games Ltd | Information & communication | 2024 |
| Diamond Hands Care Services Ltd | Households | 2019 |
| Diamond Stride Ltd | Wholesale & retail | 2024 |
| Diana Korobovaite Ltd | Extraterritorial | 2022 |
| Diana Kraujuniene Limited | Extraterritorial | 2022 |
| Dickerman Overseas Contracting Company Limited | Manufacturing | 1992 |
| Dida G&C Property Ltd | Real estate | 2025 |
| Didabe Limited | Wholesale & retail | 2024 |
| Digiapp Force Ltd | Information & communication | 2025 |
| Digital Closer Co Limited | Wholesale & retail | 2025 |
| Digital Genei Limited | Information & communication | 2023 |
| Digits and Beyond Ltd | Professional & scientific | 2025 |
| Dila Takeaway Food Ltd | Hospitality | 2024 |
| Dilman Properties Limited | Real estate | 2023 |
| DIN Carrier Limited | Transport & logistics | 2025 |
| Dinomike Design Ltd | Arts & recreation | 2016 |
| Direct Debt Recovery Limited | Other services | 2009 |
| Direct Maintenance Limited | Administrative & support | 2008 |
| Disa Handyman Works Ltd | Other services | 2024 |
| Disability Support & Care Ltd | Administrative & support | 2025 |
| Distinctly British Comics Ltd | Information & communication | 2025 |
| District Printz Limited | Manufacturing | 2026 |
| Ditsch UK Limited | Wholesale & retail | 2025 |
| Diverse IT Consultants Limited | Information & communication | 2009 |
| Diverse Roles One Ltd | Administrative & support | 2025 |
| Divine JAY ABS Ltd | Health & social care | 2021 |
| Dixie Group Ltd | Wholesale & retail | 2019 |
| Dixon Plumbing Contractors Limited | Construction | 2012 |
| DJ Paterson Limited | Professional & scientific | 2013 |
| DJ Plumbing Ltd | Construction | 2023 |
| DJ Repair Solutions Ltd | Wholesale & retail | 2026 |
| DJC Tenpin Bowling Services Limited | Manufacturing | 2009 |
| DJN Commercials (Northants) Limited | Wholesale & retail | 2025 |
| DJN Transport Limited | Transport & logistics | 2011 |
| DJP Decorating Limited | Construction | 2013 |
| DK Carpentry Services Limited | Manufacturing | 2018 |
| DKB Project Management Ltd | Construction | 2024 |
| Dlbec Ltd | Construction | 2021 |
| Dlbec Renewables Ltd | Administrative & support | 2024 |
| DLG Logistics UK Ltd | Transport & logistics | 2019 |
| DLR Groundworks Ltd | Construction | 2023 |
| DMH Steelwork Ltd | Construction | 2019 |
| DNB Ecommerce Ltd | Wholesale & retail | 2023 |
| DNS Scaffold Services Limited | Construction | 2025 |
| Doccsales Ltd | Manufacturing | 2020 |
| Doctor JAY Limited | Health & social care | 2023 |
| Dodsworth Developments Limited | Construction | 2025 |
| Dogoter Solutions Ltd | Wholesale & retail | 2023 |
| Dogzdinner Ltd | Administrative & support | 2012 |
| Dolce Segreto Shop Ltd | Wholesale & retail | 2020 |
| Dolly Communication CIC | Education | 2024 |
| Dom's Inspection Services Ltd | Professional & scientific | 2018 |
| Domestic Bliss Engineers Ltd | Other services | 2023 |
| Domkus Ltd | Wholesale & retail | 2017 |
| Donis Solutions Ltd | Wholesale & retail | 2019 |
| Donotek Media Ltd | Information & communication | 2025 |
| Doorway Services (Automation) Limited | Other services | 2013 |
| Doranda Limited | Professional & scientific | 1912 |
| Dorsef Limited | Administrative & support | 2026 |
| DOT & Stripe Ltd | Administrative & support | 2020 |
| Douglas House Management Services Limited | Real estate | 2004 |
| Douglas Shade Ltd | Wholesale & retail | 2024 |
| Dovecliffe Fishing Limited | Arts & recreation | 1963 |
| DP Caravans Limited | Hospitality | 2017 |
| DPB Surveys Limited | Construction | 2007 |
| DPG Recruitment Limited | Administrative & support | 2024 |
| DPM Sales Ltd | Wholesale & retail | 2025 |
| Dpotogo Ltd | Information & communication | 2019 |
| DPR 2021 Limited | Hospitality | 2021 |
| DPS Business Solutions Limited | Administrative & support | 2024 |
| DR Herman Holtzhausen Limited | Other services | 2006 |
| DR Javed Ehtisham Limited | Education | 2016 |
| DR K Psychology Limited | Education | 2026 |
| DR Land Management Company Limited | Real estate | 2022 |
| Dragon Drilling Services Ltd | Construction | 2019 |
| Drainjet Ltd | Water & waste | 2012 |
| Drake LEE Mews (Kettering) Limited | Households | 1994 |
| Draper Property Ventures Ltd | Real estate | 2026 |
| Draughtworks Limited | Professional & scientific | 2022 |
| Dream FLY Chill Limited | Administrative & support | 2018 |
| Dream Island (Kettering) Ltd | Wholesale & retail | 2012 |
| Dream Move Solutions Ltd | Wholesale & retail | 2025 |
| Dream Properties Development Ltd | Real estate | 2025 |
| Dreamaxis Ltd | Professional & scientific | 2025 |
| Drew Street Limited | Extraterritorial | 1943 |
| Drinks Partner Ltd | Wholesale & retail | 2021 |
| Driving Master Hub Limited | Education | 2025 |
| Drummond Aggregates Limited | Transport & logistics | 2016 |
| DRY Close Design Ltd | Administrative & support | 2011 |
| Dryland Medical Ltd | Real estate | 2019 |
| DS Holdings (Cranford) Ltd | Real estate | 2024 |
| DS John Holdings Limited | Professional & scientific | 2013 |
| DSV Consultant Limited | Construction | 2023 |
| DTH Bespoke Ltd | Construction | 2025 |
| DTM Accounting Limited | Professional & scientific | 2019 |