| Ddge Medical Limited | Health & social care | 2021 |
| DDJ Car Care Ltd | Other services | 2017 |
| DE Edge Salon and Beauty Supplies UK Ltd | Wholesale & retail | 2022 |
| DE One Services Limited | Construction | 2025 |
| Deals Vault Ltd | Wholesale & retail | 2024 |
| Decade Business Ltd | Wholesale & retail | 2025 |
| Deeb Capital Investments Ltd | Real estate | 2026 |
| Deen Family Properties Ltd | Real estate | 2021 |
| Deensoft Ltd | Information & communication | 2020 |
| Deivis Tugovas Ltd | Construction | 2018 |
| Deko Painting Ltd | Construction | 2023 |
| DEL Boys Builders Ltd | Construction | 2023 |
| Delectables & Pastry Hub Ltd | Hospitality | 2021 |
| Deligad Clean Ltd | Administrative & support | 2025 |
| Delight Foods International Limited | Manufacturing | 2017 |
| Delightsomehands Events Ltd | Administrative & support | 2026 |
| Dell Baler Limited | Extraterritorial | 1946 |
| Dell Fit Limited | Wholesale & retail | 2025 |
| Deluxe Living Properties Ltd | Extraterritorial | 2023 |
| Demosh Ltd | Construction | 2019 |
| Denali Building Services Ltd | Construction | 2023 |
| Dermatrack Limited | Information & communication | 2026 |
| Desi Chai Ltd | Wholesale & retail | 2025 |
| Desi Chaska Limited | Hospitality | 2019 |
| Desi Food Deli Ltd | Hospitality | 2021 |
| Desi Travellers Ltd | Administrative & support | 2023 |
| Design Dash Limited | Arts & recreation | 2013 |
| Desiveg Ltd | Wholesale & retail | 2020 |
| DESTINY7 CIC | Education | 2017 |
| DEV News Limited | Wholesale & retail | 2019 |
| Devarch Services Ltd | Information & communication | 2024 |
| Dezz Properties Ltd | Real estate | 2025 |
| DGS Asset Property Investment Limited | Real estate | 2020 |
| DGS Management Ltd | Construction | 2015 |
| DH One Ltd | Professional & scientific | 2020 |
| Dhanish Cafe Limited | Manufacturing | 2025 |
| Dhanish E-Commerce Limited | Wholesale & retail | 2025 |
| DHH Construction & Refurbishments Limited | Construction | 2022 |
| Dhriya Limited | Wholesale & retail | 2024 |
| Diagnostic and Basic Automotive Limited | Wholesale & retail | 2009 |
| Diamond Electrical Services ( Surrey ) Ltd | Construction | 2023 |
| Diamond Property Success Ltd | Real estate | 2023 |
| Diamond Social Club UK | Other services | 2023 |
| Diana and Amore Limited | Administrative & support | 2025 |
| Diaz Construction Ltd | Construction | 2025 |
| Dido Musa Tumpu Ltd | Administrative & support | 2025 |
| Digitek Systems Ltd | Information & communication | 2019 |
| Digits and Bytes Associates Limited | Professional & scientific | 2008 |
| Dijination Limited | Wholesale & retail | 2020 |
| Dijo Sandwich & Deli Ltd | Wholesale & retail | 2025 |
| Dimitriu Limited | Construction | 2009 |
| Dimple Construction Ltd | Construction | 2015 |
| Dinestar Ltd | Hospitality | 2022 |
| Dings Authentic Jerk Limited | Hospitality | 2026 |
| Direct Appliance Hub Ltd | Wholesale & retail | 2019 |
| Direct Refurbishments Ltd | Construction | 2020 |
| Directhome Living Ltd | Real estate | 2026 |
| Direction 1ST Ltd | Information & communication | 2020 |
| Discovering Polaris Limited | Real estate | 2025 |
| Distinguished Performance CIC | Education | 2025 |
| Distinguished Studios LDN Ltd | Wholesale & retail | 2025 |
| District Associates Group Ltd | Information & communication | 2023 |
| Divine Cafe Ltd | Hospitality | 2017 |
| Divine Car Care Ltd | Wholesale & retail | 2026 |
| Divine Start Limited | Health & social care | 2023 |
| DJ Lala Ltd | Information & communication | 2017 |
| DJ Security and Communication Limited | Administrative & support | 2013 |
| DK Body & Paint Ltd | Wholesale & retail | 2025 |
| DK Global Services Ltd | Transport & logistics | 2024 |
| Dkfb Limited | Manufacturing | 2025 |
| Dkman Logistics Limited | Transport & logistics | 2026 |
| DKO Property Investment Limited | Real estate | 2019 |
| DL Housing Ltd | Real estate | 2026 |
| DM Building Services Ltd | Construction | 2015 |
| DM Properties Services Ltd | Real estate | 2022 |
| DM7 Homes Ltd | Real estate | 2026 |
| DMP Build Limited | Construction | 2026 |
| DMS Group London Ltd | Administrative & support | 2023 |
| DMS Interiors Limited | Construction | 2016 |
| DMW Luxury Living Ltd | Real estate | 2024 |
| Dnaw Services Ltd | Construction | 2025 |
| Dnvy Limited | Real estate | 2025 |
| Dobuilding Ltd | Construction | 2019 |
| Dodeca Protections Limited | Administrative & support | 2023 |
| Dolor Properties Ltd | Real estate | 2020 |
| Dolphin Building Solutions Limited | Construction | 2023 |
| DOM TOM Limited | Real estate | 2019 |
| DON YOO Properties Ltd | Real estate | 2025 |
| Donal Lynch Ltd | Construction | 2016 |
| Donald Fletcher Ltd | Real estate | 2019 |
| Donkor Services Ltd | Professional & scientific | 2025 |
| Donovan's Coffee House & Kitchen Limited | Hospitality | 2023 |
| Dons Dream Housing CIC | Health & social care | 2023 |
| Doorium Jewels Ltd | Wholesale & retail | 2022 |
| Doproperty Limited | Real estate | 2022 |
| Dorsen Consulting Limited | Information & communication | 2024 |
| Dorset Gardens Freehold Limited | Real estate | 2017 |
| Doublellk Company Limited | Health & social care | 2015 |
| Dovetail Specialist Joinery Ltd | Manufacturing | 2001 |
| Doveyes Ltd | Real estate | 2021 |