| Curtography Ltd | Professional & scientific | 2026 |
| Curve Credit Trading Daily Limited | Information & communication | 2018 |
| Cusack Associates Limited | Construction | 2013 |
| Cusp London Limited | Professional & scientific | 2013 |
| Customized Real Estate Solutions Ltd | Real estate | 2021 |
| Customs by J1 Ltd | Wholesale & retail | 2022 |
| Cute Solutions UK Ltd | Information & communication | 2002 |
| Cuts & Bruises Barbershop Ltd | Other services | 2016 |
| CVS Properties Ltd | Financial services | 2015 |
| CW BIZ DEV Ltd | Professional & scientific | 2012 |
| CW Trade BG Ltd | Wholesale & retail | 2021 |
| CW Transportation Services Ltd | Transport & logistics | 2026 |
| CWP Solutions Ltd | Administrative & support | 2006 |
| Cybabrain Ltd | Information & communication | 2011 |
| Cyberstoreglobal Ltd | Information & communication | 2020 |
| Cyclamen Management Limited | Hospitality | 2012 |
| Cyprop Ltd | Hospitality | 2015 |
| CZM Trans Logistics Ltd | Transport & logistics | 2025 |
| D & G Developments Limited | Construction | 2001 |
| D & M Auto Mobile Services Ltd | Wholesale & retail | 2019 |
| D & M Auto Sales Ltd | Wholesale & retail | 2021 |
| D Barrett Roofing Limited | Construction | 2020 |
| D D S Food Imports Ltd | Wholesale & retail | 1999 |
| D Daniels Music Limited | Information & communication | 2012 |
| D Keys & Sons Ltd | Wholesale & retail | 2022 |
| D Vakili Limited | Information & communication | 2022 |
| D&C Repairs Ltd | Extraterritorial | 2023 |
| D&G Holdings Group Ltd | Hospitality | 2025 |
| D&J Beyond Accounting Limited | Professional & scientific | 2019 |
| D&M Administration Services Limited | Administrative & support | 2013 |
| D-Gass Ltd | Health & social care | 2019 |
| D. HOY Building & Restoration Limited | Construction | 2019 |
| D. Menswear Direct Limited | Manufacturing | 2021 |
| D. T. Watkins Engineering Services Ltd | Construction | 2023 |
| D.C.I. Electrical Systems Ltd | Construction | 2011 |
| D.E. James & SON (Provisions) Limited | Real estate | 1965 |
| D.E.F Electrical and GAS Services Limited | Construction | 2017 |
| D.E.F GAS Limited | Construction | 2017 |
| D.E.F Group Limited | Professional & scientific | 2007 |
| D.M.Russo Ltd | Construction | 2022 |
| D.N.B Events Ltd | Administrative & support | 2024 |
| D.T.Watkins Electrics Limited | Construction | 2014 |
| D.U&M Construct Ltd | Construction | 2024 |
| DA Franco Limited | Hospitality | 2008 |
| DA Vinci Dental Engineers Ltd | Health & social care | 2025 |
| Dacoda Lettings Ltd | Real estate | 2025 |
| Dacoda Ltd | Professional & scientific | 2022 |
| Dacoda Property Ltd | Real estate | 2024 |
| Dadm Limited | Administrative & support | 2012 |
| DAE99 Services Ltd | Construction | 2020 |
| Daily Fresh Cleaning Services Ltd | Administrative & support | 2024 |
| Daimies International Limited | Health & social care | 2016 |
| Dairo World Limited | Wholesale & retail | 2024 |
| Daisy Connections Ltd | Other services | 2024 |
| DAK Investments Limited | Administrative & support | 2025 |
| Dalal Family Investments Limited | Real estate | 2020 |
| Dale Chahal Ltd | Real estate | 2016 |
| Dalley Property (Medway) Ltd | Real estate | 2021 |
| Daly Bros Construction Ltd | Construction | 2013 |
| Damien D Construction Ltd | Construction | 2025 |
| Dan-Cri Mechanical Services Ltd | Extraterritorial | 2018 |
| Dane Court (Hertford) Management Co. Limited | Households | 1993 |
| Danesbury Park Estates Ltd | Construction | 2022 |
| Danielkaitiff Limited | Health & social care | 2017 |
| Daniels Building Services Ltd | Construction | 2020 |
| Daniotrans Ltd | Information & communication | 2025 |
| Danmarc RZ Limited | Administrative & support | 2014 |
| Danny Craven Photography Ltd | Professional & scientific | 2024 |
| Dansyca Ltd | Information & communication | 2021 |
| Danvi Construction Ltd | Construction | 2018 |
| DAO Yuan Limited | Agriculture & fishing | 2019 |
| DAR Accountants Ltd | Other services | 2015 |
| DAR Accounting Ltd | Professional & scientific | 2020 |
| DAR Limited | Other services | 2026 |
| Darabi Holdings Ltd | Real estate | 2024 |
| Darbaz Properties Limited | Real estate | 2003 |
| DARE2DANCE Company CIC | Arts & recreation | 2023 |
| Daretech Solutions Ltd | Information & communication | 2024 |
| Darley Design Ltd | Professional & scientific | 2021 |
| Darlings Boutique Ltd | Wholesale & retail | 2023 |
| Darren Loveday Limited | Professional & scientific | 2011 |
| Dart Property Management Services Limited | Real estate | 2013 |
| Darwise Ltd | Other services | 2025 |
| Dash Wealth Creation Ltd | Real estate | 2022 |
| DAT Consultants Limited | Administrative & support | 2017 |
| Data Infotec Limited | Financial services | 2003 |
| Data Rock Technologies Ltd | Professional & scientific | 2024 |
| Databiotic Limited | Information & communication | 2013 |
| Datanex Limited | Information & communication | 2015 |
| Dataz Limited | Information & communication | 2023 |
| Datazed Ltd | Information & communication | 2017 |
| Datona Metal Ltd | Manufacturing | 2023 |
| Datta Design Limited | Information & communication | 1997 |
| Davansh Services Limited | Professional & scientific | 2019 |
| Davdean Limited | Households | 1972 |
| Dave Shaw Studio 2.0 Ltd | Professional & scientific | 2025 |
| Dave Shrimpton Photography Limited | Professional & scientific | 2015 |
| Davenport Investments Ltd | Real estate | 2025 |
| David Antonia Team Ltd | Construction | 2019 |
| David Charles Childrens Wear Limited | Manufacturing | 1971 |