| Cromtech Solutions Limited | Information & communication | 2025 |
| Cromwell Maintenance Limited | Construction | 2015 |
| Crossfit Esher Limited | Health & social care | 2013 |
| Crosslane Capital Ltd | Real estate | 2023 |
| Crowned Couture Merch Ltd | Wholesale & retail | 2021 |
| Crumlin Investments Capital Limited | Other services | 2024 |
| Crumlin Investments Management Limited | Other services | 2024 |
| CSH Squared Limited | Professional & scientific | 2010 |
| Csiveyer Ltd | Arts & recreation | 2025 |
| Ctgh Limited | Administrative & support | 2021 |
| Cube Plumbing Solutions Ltd | Construction | 2012 |
| Curaley Limited | Information & communication | 2025 |
| Curately Ltd | Professional & scientific | 2022 |
| Curtis Conversions Limited | Construction | 2019 |
| CV Property Investment Ltd | Real estate | 2018 |
| Cygnet Gifts Limited | Wholesale & retail | 2005 |
| D Street Productions Ltd | Other services | 2015 |
| D&P Infinity Limited | Real estate | 2022 |
| D-Hok Design Ltd | Professional & scientific | 2022 |
| D.C.Power Solutions Ltd | Information & communication | 2003 |
| Daal Associates Ltd | Professional & scientific | 2021 |
| Dafson Properties Ltd | Real estate | 2020 |
| Daleo Properties Ltd | Real estate | 2021 |
| DAM 3 Ltd | Information & communication | 2014 |
| Dance Addiction (Studios) Ltd | Education | 2018 |
| Danebury Holdings Ltd | Financial services | 2021 |
| Danebury Property Limited | Real estate | 2011 |
| Danesway Developments Limited | Construction | 2025 |
| Danjuma Collection Ltd | Wholesale & retail | 2011 |
| Darkside Automotive Limited | Wholesale & retail | 2025 |
| Dartz Sports Arena Limited | Arts & recreation | 2025 |
| Data Vanguard Limited | Information & communication | 2002 |
| Datasat Media Ltd | Information & communication | 2011 |
| Davell Autos Limited | Real estate | 1972 |
| David Conran Limited | Wholesale & retail | 2011 |
| David Coombs Associates Limited | Professional & scientific | 2011 |
| David Godfrey Ltd | Information & communication | 2018 |
| David Graham Entertainment Limited | Arts & recreation | 1999 |
| David Prince Ltd | Professional & scientific | 2013 |
| Davis Square (UK) Holdings Ltd. | Administrative & support | 2019 |
| Davisville Group Ltd | Real estate | 2018 |
| Davnic Investments Ltd | Administrative & support | 2021 |
| Dawn Inner Development Limited | Professional & scientific | 2023 |
| Dayar House Limited | Real estate | 2025 |
| Daytona Group Holdings Limited | Financial services | 2015 |
| Daytona Holdings Limited | Financial services | 2009 |
| Daytona Manchester Limited | Arts & recreation | 2003 |
| Daytona Milton Keynes Limited | Other services | 2003 |
| Daytona Motorsport Limited | Extraterritorial | 2010 |
| Daytona Motorsport Management Limited | Professional & scientific | 2008 |
| Daytona Sandown Park Limited | Other services | 2003 |
| DC Restaurants and Bars Ltd | Hospitality | 2020 |
| Dcab Holdings Ltd | Administrative & support | 2013 |
| DDB Nordic Holding Limited | Financial services | 2016 |
| Ddok Solutions Ltd | Professional & scientific | 2020 |
| DE Consultancy Limited | Information & communication | 2025 |
| DE LA Salle Developments Limited | Financial services | 2025 |
| DE Wetshof International Limited | Wholesale & retail | 2002 |
| Deanne Jade Ltd | Education | 2020 |
| Debpro Limited | Professional & scientific | 2024 |
| Decillion Financial Planning Ltd | Financial services | 2001 |
| Delamere Management Limited | Professional & scientific | 2013 |
| Delightful Designs Ltd | Professional & scientific | 2024 |
| Delphi Innovations Ltd | Administrative & support | 2024 |
| Delta Repetition Components Limited | Extraterritorial | 1948 |
| Delvaux Limited | Wholesale & retail | 1980 |
| Denning Consulting & Coaching Ltd | Professional & scientific | 2017 |
| Dentamour Property Limited | Real estate | 2019 |
| Design + Sculpt Ltd | Construction | 2025 |
| Dessert ETC Limited | Wholesale & retail | 2021 |
| Detroit Consultant Engineering Limited | Professional & scientific | 2012 |
| Development Potential Services Limited | Professional & scientific | 2016 |
| Devsbrain Ltd | Information & communication | 2022 |
| Dexara Limited | Financial services | 2026 |
| DG Elite Motors Ltd | Wholesale & retail | 2022 |
| DGM Callaghan Ltd | Information & communication | 2017 |
| Dhh(Uk) Legal Limited | Professional & scientific | 2024 |
| Diagnostic and Interventional Radiology Services Limited | Health & social care | 2016 |
| Digital Commerce Consulting Ltd | Professional & scientific | 2023 |
| Digital Dive Technologies Limited | Information & communication | 2023 |
| Digital Mercenaries Limited | Information & communication | 2005 |
| Digital Print Machines Limited | Wholesale & retail | 2013 |
| Digital Spark Incorporated Ltd | Professional & scientific | 2024 |
| Digitx Limited | Extraterritorial | 1999 |
| Dipper Bridge Consulting Limited | Professional & scientific | 2017 |
| DK & SON Limited | Financial services | 2014 |
| DMC Coaching LLP | | 2015 |
| DND Construction and Maintenance Group Limited | Construction | 2021 |
| Dominic Toms Golf Ltd | Arts & recreation | 2015 |
| Domino Films Ltd | Information & communication | 2025 |
| Double Communications Limited | Professional & scientific | 2022 |
| DR AG LIM Ltd | Health & social care | 2018 |
| DR Dunne Ltd | Health & social care | 2022 |
| DR Wayne Hirschowitz Limited | Health & social care | 2008 |
| Draco Fitness Ltd | Other services | 2024 |
| Drake & Reynolds Limited | Professional & scientific | 1984 |
| Draper Family Investment Company Unlimited | Financial services | 2021 |
| Dreddge Partners 2 LLP | | 2021 |
| Dreddge Partners LLP | | 2019 |
| Drever Associates Limited | Health & social care | 2005 |