| Crys Consultancy Ltd | Professional & scientific | 2024 |
| Crystal Clear Corporation Ltd | Transport & logistics | 2024 |
| Csdriving Ltd | Transport & logistics | 2019 |
| Ctio Ltd | Education | 2022 |
| Cubaj Utilities Ltd | Construction | 2023 |
| Cucu Tiler Ltd | Construction | 2015 |
| Cultural Capital Ltd | Financial services | 2025 |
| Cure ALL Ltd | Health & social care | 2025 |
| CVI Cleaners Ltd | Administrative & support | 2023 |
| CVI Motors Ltd | Wholesale & retail | 2026 |
| CVI. Builders Ltd | Construction | 2016 |
| Cynosure Imperium Consulting Ltd | Professional & scientific | 2018 |
| D W Building & Roofing Limited | Construction | 2020 |
| D&F Accountants Ltd | Professional & scientific | 2026 |
| D&J Haulage Ltd | Transport & logistics | 2020 |
| D&K Bros Ltd | Wholesale & retail | 2022 |
| D&S Flooring Ltd | Construction | 2025 |
| D&W Ventilation Ltd | Construction | 2022 |
| D&Y Kitchens Ltd | Construction | 2013 |
| D-Code Events Ltd | Hospitality | 2022 |
| D. Bowers Roofing Limited | Construction | 2011 |
| Da&S Limited | Construction | 2019 |
| Da&S Properties Limited | Real estate | 2025 |
| Dadson Limited | Health & social care | 2010 |
| Dagenham Construction Limited | Construction | 1976 |
| Daisy's Housekeeping Ltd | Administrative & support | 2020 |
| Dalin Tyres and Alignment Ltd | Wholesale & retail | 2012 |
| Damolol Properties Ltd | Real estate | 2023 |
| Dan's Data Solution Ltd | Information & communication | 2022 |
| Danaar Limited | Real estate | 2023 |
| Daniel L Smith Ltd | Information & communication | 2025 |
| Daniel Tyson Styling Ltd | Professional & scientific | 2023 |
| Danube Services Ltd | Transport & logistics | 2024 |
| Darsam Ltd | Transport & logistics | 2023 |
| Dartford Driving School Ltd | Education | 2025 |
| Dascalu Logistics Limited | Transport & logistics | 2017 |
| Davak Engineering Ltd | Professional & scientific | 2016 |
| David Grove Consolidated Resources Ltd | Professional & scientific | 2025 |
| Davidson Transport Ltd | Transport & logistics | 2016 |
| DCO Bulk Haulage Ltd | Transport & logistics | 2020 |
| DD Properties Limited | Real estate | 2022 |
| Debstel Limited | Wholesale & retail | 2012 |
| Debyet Tradings Ltd | Manufacturing | 2022 |
| Deckstar Ltd | Wholesale & retail | 2025 |
| DED Gjoni Limited | Construction | 2024 |
| Deees Investment Ltd | Real estate | 2014 |
| Deep Facades Ltd | Construction | 2018 |
| Deep Water Estates Ltd | Real estate | 2025 |
| Defendx Corporation Ltd | Wholesale & retail | 2020 |
| Del&Chris Ltd | Manufacturing | 2023 |
| Deltasmart Limited | Information & communication | 1998 |
| Denal Express Ltd | Wholesale & retail | 2021 |
| Denoli Homes Ltd | Real estate | 2025 |
| DEO Enterprise Ltd | Professional & scientific | 2017 |
| Derovers Limited | Real estate | 2021 |
| Desdev Consult Ltd | Health & social care | 2014 |
| Destiny Empowerment Temple International Ministries Ltd | Other services | 2017 |
| Destna Services Ltd | Public administration | 2022 |
| Details on Demand Ltd | Wholesale & retail | 2021 |
| Develop & Grow Limited | Information & communication | 2026 |
| Devendra Maintenance Limited | Construction | 2023 |
| Devil-Fish Creative Limited | Manufacturing | 2010 |
| Dgcakes Ltd | Hospitality | 2018 |
| DGL Beststeps Flooring Ltd | Construction | 2025 |
| DGR Carpentry & Building Limited | Construction | 2011 |
| DGS Decorating Limited | Construction | 2012 |
| Diadem Custodians Ltd | Hospitality | 2025 |
| Didi Trans Limited | Transport & logistics | 2018 |
| Dilkes Academy | Education | 2012 |
| Dim&Art Limited | Construction | 2016 |
| Dinn Consulting Ltd | Professional & scientific | 2013 |
| Diran Limited | Wholesale & retail | 2003 |
| Disinfect Direct UK Limited | Administrative & support | 2020 |
| Divine Z Ltd | Construction | 2021 |
| DJ Sean Events Ltd | Arts & recreation | 2026 |
| DJ Seanmusic Ltd | Administrative & support | 2023 |
| DK Electrical Ltd | Construction | 2025 |
| DK13 Limited | Transport & logistics | 2026 |
| Dklr Ltd | Transport & logistics | 2020 |
| DLH Home Letts Ltd | Real estate | 2013 |
| Dlight Healthcare Ltd | Health & social care | 2023 |
| DLL Catering Ltd | Hospitality | 2026 |
| DNA Decor Ltd | Construction | 2024 |
| DNC GAS Ltd | Construction | 2022 |
| DNR Handyman Services Limited | Construction | 2015 |
| Doal Builders Ltd | Construction | 2024 |
| DOC Detailz Ltd | Administrative & support | 2021 |
| Docklands First Property Limited | Real estate | 2025 |
| Dodu Building Services Limited | Construction | 2014 |
| Doic Ltd | Construction | 2025 |
| Dolding Limited | Financial services | 2017 |
| Domi Technologies Limited | Wholesale & retail | 2025 |
| Donwood Build Ltd | Construction | 2017 |
| Dorian Transport Ltd | Transport & logistics | 2019 |
| Dosom Build Ltd | Construction | 2020 |
| DPG London Ltd | Transport & logistics | 2024 |
| DR SE Contractors Limited | Construction | 2015 |
| DR Tosyn’S Aesthetics Ltd | Health & social care | 2026 |
| Dreamkeyy Ltd | Real estate | 2025 |
| Drip N Dash Ltd | Health & social care | 2025 |