| Crowned Constructions Limited | Construction | 2024 |
| Cruden Capital Partners Ltd | Financial services | 2026 |
| CTE Developments Limited | Real estate | 2023 |
| CTS Property Ltd | Real estate | 2022 |
| CUBE3LABS Limited | Information & communication | 2025 |
| Cudd Property Holdings Ltd | Real estate | 2023 |
| Cudham Sports Association Ltd | Arts & recreation | 2014 |
| Culturevate Limited | Professional & scientific | 2015 |
| Cunnack Holdings Ltd | Financial services | 2025 |
| Cwlb Limited | Financial services | 2019 |
| D P Wilson Enterprises Limited | Professional & scientific | 2025 |
| D.A.Weekes Limited | Administrative & support | 2000 |
| D.Povey Electrical Ltd | Construction | 2022 |
| D.S.N. Building Contractors Limited | Professional & scientific | 1988 |
| D1P Cleantech Limited | Professional & scientific | 2024 |
| Dalton Roofing Contractors Ltd | Administrative & support | 2017 |
| Damibee Collective Ltd | Professional & scientific | 2025 |
| Damonoway Limited | Information & communication | 2014 |
| Dark Academia Ltd | Information & communication | 2024 |
| DAS Integration Ltd | Professional & scientific | 2026 |
| Data Consulting Group Ltd | Information & communication | 2019 |
| Datahg Limited | Professional & scientific | 2005 |
| Datum Surveyors Ltd | Real estate | 2020 |
| David J Scott Limited | Professional & scientific | 2022 |
| David Rudd & SON Plumbing and Heating Ltd | Construction | 2023 |
| DC Media Creations Limited | Professional & scientific | 2021 |
| Dcorp Limited | Information & communication | 2015 |
| Ddemand Ltd | Wholesale & retail | 2021 |
| Ddoc Management Consultancy Limited | Professional & scientific | 2012 |
| Decorating Contractors Ltd | Construction | 2020 |
| Deighton Developments Ltd | Real estate | 2019 |
| Delahunty Property Ltd | Construction | 2024 |
| Deluge Environmental Limited | Professional & scientific | 2023 |
| Demeniz Limited | Households | 2021 |
| Demgok Limited | Real estate | 2021 |
| Dennis Irvine Studio Limited | Professional & scientific | 2015 |
| Dent TEC Limited | Administrative & support | 2005 |
| Derek Grice. BS. Ltd | Construction | 2014 |
| Devo Technology UK Limited | Information & communication | 2018 |
| Dharani Foods Limited | Wholesale & retail | 2021 |
| Digital Puffin Limited | Information & communication | 2014 |
| Diwana Vila Ltd | Hospitality | 2020 |
| DJ Roofing & SON Ltd | Construction | 2022 |
| DKG Investments Ltd | Professional & scientific | 2018 |
| Dkmp Electrical Limited | Construction | 2026 |
| DLF Services Limited | Professional & scientific | 2020 |
| Dlmr Design Consultants Ltd | Professional & scientific | 2016 |
| DM Electrical & Building Services Ltd | Construction | 2018 |
| Dmcgi Ltd | Arts & recreation | 2019 |
| DOH RAY MI Ltd | Education | 2010 |
| Doli Contracts Ltd | Construction | 2026 |
| Doni London Ltd | Construction | 2016 |
| Donita Homes Ltd | Financial services | 2020 |
| Donita Property Company Ltd | Real estate | 2025 |
| Doulton Underwriting Agents Limited | Financial services | 1997 |
| DR Akruti Aesthetics Ltd | Health & social care | 2025 |
| DR B Medical Limited | Health & social care | 2021 |
| DR Simon Sporton Medical Ltd | Health & social care | 2019 |
| DR. Lincoln Advice Centre Ltd | Professional & scientific | 2010 |
| Drain Detectives (London) Limited | Water & waste | 2017 |
| Drainage Blasters Ltd | Construction | 2025 |
| Dreamy Home London Ltd | Administrative & support | 2025 |
| Drop Shadow Films Ltd | Information & communication | 2025 |
| DSW Media Ltd | Professional & scientific | 2014 |
| DT Design and DEC Ltd | Construction | 2026 |
| Duffs of London Limited | Wholesale & retail | 2012 |
| Dunne Associates Ltd | Information & communication | 2015 |
| Dunne Hill Electrical Services Limited | Construction | 2014 |
| E a Diggers Ltd | Construction | 2019 |
| E. & S.B. Davis Limited | Wholesale & retail | 1971 |
| Eagle Crest Global Enterprise Ltd | Real estate | 2023 |
| East Surrey Tutors Ltd | Education | 2018 |
| Ebubedike Limited | Health & social care | 2012 |
| Eclipse Planning Consultants Ltd | Professional & scientific | 2023 |
| Eco Air Conditioning Limited | Energy | 2019 |
| Ecovicks Limited | Wholesale & retail | 2019 |
| ED Copywriting & Strategy Ltd | Professional & scientific | 2022 |
| Eden Park Installations Ltd | Construction | 2011 |
| Edie Property Limited | Real estate | 2021 |
| Editor Homes Limited | Construction | 2024 |
| Eels Enterprise Limited | Professional & scientific | 2020 |
| Ehml Limited | Hospitality | 2021 |
| EL Kervan Grill House Limited | Hospitality | 2019 |
| Eleanor Jones Ltd | Health & social care | 2025 |
| Electroset Ltd | Construction | 2015 |
| Eleganton Limited | Real estate | 2011 |
| Elevate Portfolio Management Ltd | Real estate | 2025 |
| Elevate Property Limited | Real estate | 2016 |
| Ella London 2019 Ltd | Professional & scientific | 2019 |
| Ellisium Home Improvements Ltd | Construction | 2025 |
| Elson Geotechnical Limited | Professional & scientific | 2019 |
| Ember Vale Living Ltd | Health & social care | 2025 |
| EMC IT Solutions Ltd | Information & communication | 2014 |
| Emerald Signature Living Ltd | Real estate | 2025 |
| Emma Rowland Limited | Professional & scientific | 2024 |
| Emma's Kitchen Kent Limited | Hospitality | 2024 |
| Employ Disabled Limited | Administrative & support | 2019 |
| Encentre Limited | Professional & scientific | 2011 |
| Endace Europe Limited | Information & communication | 2003 |
| Enzo the Sicilian Chef Ltd | Hospitality | 2017 |