| Diamond Cater Ltd | Hospitality | 2025 |
| Diamond Consultancy Ltd | Administrative & support | 2020 |
| Diamond Finanz Ltd | Professional & scientific | 2024 |
| Diamond Shine Homes Ltd | Administrative & support | 2025 |
| Diamond Stuff Limited | Wholesale & retail | 2025 |
| Diamondthrust Limited | Construction | 1987 |
| Dibrix Group Ltd | Construction | 2025 |
| Didi-Fashion Limited | Wholesale & retail | 2020 |
| Diet Route UK Ltd | Health & social care | 2012 |
| Digipeeps Ltd | Information & communication | 2016 |
| Digital Base Zone Ltd | Information & communication | 2019 |
| Digital Change Delivery Limited | Administrative & support | 2015 |
| Digital Daddy Ltd | Information & communication | 2025 |
| Digital Dialers Ltd | Other services | 2020 |
| Digital Interpretations UK Ltd | Professional & scientific | 2024 |
| Digital Softtech Limited | Information & communication | 2023 |
| Digital Strategic Solutions Ltd | Administrative & support | 2026 |
| Digital Transformation Consulting Ltd | Information & communication | 2018 |
| Digital Victory Ltd | Administrative & support | 2013 |
| Diiyaa Ltd | Wholesale & retail | 2025 |
| DIL Consultants Limited | Professional & scientific | 2012 |
| Dilan Internation Co., Ltd | Wholesale & retail | 2024 |
| Dilawari Limited | Information & communication | 2014 |
| Dillcom Ltd | Information & communication | 2018 |
| DIN & LID Properties Ltd | Real estate | 2025 |
| Dina Communications Limited | Professional & scientific | 2012 |
| Dina Maria's Embroidery Designs Ltd | Arts & recreation | 2019 |
| Dinakaran Ltd | Professional & scientific | 2016 |
| Dine by Design London Ltd. | Hospitality | 2013 |
| Diqs Ltd | Professional & scientific | 2016 |
| Direct Roofing Services Limited | Construction | 2020 |
| Direct VIP Chauffeurs Limited | Transport & logistics | 2003 |
| Dirty Rigger Ltd | Construction | 2025 |
| Discog Coding Academy Limited | Education | 2004 |
| Distribusha Limited | Transport & logistics | 2010 |
| Diverse IT Ltd | Professional & scientific | 2010 |
| Diversync Limited | Professional & scientific | 2005 |
| Divia and Deebha Enterprises Ltd | Real estate | 2009 |
| Divyansha International Ltd | Real estate | 2024 |
| Diyan Courier Services Ltd | Transport & logistics | 2014 |
| DJ Prash Limited | Other services | 2018 |
| Djado Gold Company Limited | Financial services | 2021 |
| Djem Transport Ltd | Transport & logistics | 2022 |
| DKP Electrics Ltd | Construction | 2011 |
| DLS1 Limited | Health & social care | 2016 |
| Dluxe Wellbeing Ltd. | Administrative & support | 2017 |
| DM Group Holdings Ltd | Professional & scientific | 2020 |
| DMF Personal Training Ltd | Administrative & support | 2024 |
| DNA Lofts Limited | Construction | 2021 |
| Dobinson Consulting Ltd | Professional & scientific | 2009 |
| Dock Marine Service Co., Ltd | Wholesale & retail | 2022 |
| Doctor Account Solutions Ltd | Professional & scientific | 2009 |
| Doflamingo Limited | Real estate | 2022 |
| Doherty Paving and Landscapes Limited | Construction | 2023 |
| Doherty Solutions Ltd | Construction | 2025 |
| Dolo Travel Ltd | Administrative & support | 2026 |
| DOMAINO11 Ltd | Wholesale & retail | 2025 |
| DOMAINO12 Ltd | Wholesale & retail | 2025 |
| DOMAINO13 Ltd | Wholesale & retail | 2025 |
| DOMAINO14 Ltd | Wholesale & retail | 2025 |
| DOMAINO15 Ltd | Wholesale & retail | 2025 |
| DOMAINO17 Ltd | Wholesale & retail | 2025 |
| DOMAINO18 Ltd | Wholesale & retail | 2025 |
| DOMAINO19 Ltd | Wholesale & retail | 2025 |
| DOMAINO20 Ltd | Wholesale & retail | 2025 |
| DOMAINO23 Ltd | Wholesale & retail | 2025 |
| DOMAINO24 Ltd | Wholesale & retail | 2025 |
| Domestic Repairs Limited | Manufacturing | 2007 |
| Dominic's Plate Ltd. | Hospitality | 2024 |
| Domus Realtors Limited | Real estate | 2024 |
| Doncaster Properties Limited | Real estate | 2024 |
| Dongguan Hanning New Material Technology Co., Ltd. | Administrative & support | 2024 |
| Donghai Industrial Co., Ltd | Administrative & support | 2023 |
| Doni & Joni Car Wash Ltd | Professional & scientific | 2016 |
| Doornumberfour Productions Ltd | Information & communication | 2025 |
| Dopamin Burst Ltd | Wholesale & retail | 2024 |
| Dorothy David Limited | Health & social care | 2022 |
| Dorricott Metrics & Process Improvement Limited | Professional & scientific | 2016 |
| Dosa Media Limited | Information & communication | 2024 |
| Double Care Flex Ltd | Health & social care | 2024 |
| Doublen INT Ltd | Education | 2010 |
| Douglas Estates Limited | Real estate | 2024 |
| DPF Revive Ltd | Wholesale & retail | 2026 |
| DPH Technologies Ltd | Information & communication | 2020 |
| DPI Trading Limited | Manufacturing | 2019 |
| DPK 21 Ltd | Households | 2021 |
| Dppp Limited | Other services | 2013 |
| DR Construction and Maintenance Services Limited | Construction | 2015 |
| DR H V Fitness Ltd | Other services | 2025 |
| DR JP Ltd | Health & social care | 2022 |
| DR K CBD Ltd | Wholesale & retail | 2020 |
| DR KN Ltd | Health & social care | 2020 |
| DR Maria Bouka Ltd | Health & social care | 2026 |
| DR Matin Training Limited | Health & social care | 2016 |
| DR Matthew L Train Limited | Health & social care | 2020 |
| DR Nelson Amaral Limited | Health & social care | 2016 |
| DR Sahar Ahmadiani Limited | Health & social care | 2024 |
| DR Tools Ltd | Wholesale & retail | 2023 |
| Drama Blocks UK Ltd | Manufacturing | 2019 |
| Dream Fit Limited | Information & communication | 2021 |