| DAR Construct Ltd | Extraterritorial | 2009 |
| Dark AGE Studios Ltd | Information & communication | 2018 |
| Daugava Limited | Hospitality | 2025 |
| Dave Allen Property Maintenance Ltd | Construction | 2022 |
| David Davey Lighting Ltd. | Information & communication | 1998 |
| David Kelly Property Services Ltd | Construction | 2020 |
| David Martin Marine Ltd | Real estate | 2023 |
| David.R.Adams Electrical Services Limited | Construction | 2006 |
| Davison, Newman & Co., Limited | Wholesale & retail | 2018 |
| Daylight Electrical Solutions Limited | Manufacturing | 2009 |
| Days Gone by Limited | Other services | 2013 |
| Dazn US LLC | | 2018 |
| DB Works Ltd | Construction | 2018 |
| Dbec Limited | Professional & scientific | 2017 |
| DC Catering Kent Ltd | Hospitality | 2025 |
| Dcaeroconnect Ltd | Wholesale & retail | 2025 |
| DDJ Developers Limited | Construction | 2024 |
| DDS Accounting Services Limited | Professional & scientific | 2006 |
| DDT Early Riser Ltd | Hospitality | 2018 |
| Deal Auction House Ltd | Wholesale & retail | 2024 |
| Deal Building Contractors Ltd | Construction | 2021 |
| Deal Scaffolding Ltd | Construction | 2017 |
| Deborah Cain Limited | Other services | 2002 |
| Defibs for Dover Community Interest Company | Health & social care | 2025 |
| Dejavu Digital Ltd | Professional & scientific | 2022 |
| Delean Jewels Ltd | Wholesale & retail | 2025 |
| Delveintolet Limited | Real estate | 2018 |
| Demarec UK Limited | Extraterritorial | 2023 |
| Democoup Invest Ltd | Extraterritorial | 2022 |
| Democoup Ltd | Extraterritorial | 2022 |
| DEN Sciences Limited | Manufacturing | 2019 |
| Denim.La, Inc. | | 2019 |
| Denise Adams Limited | Information & communication | 2020 |
| Deryve Ltd | Professional & scientific | 2024 |
| Design Truth Ltd | Administrative & support | 2021 |
| Designforfire Ltd | Professional & scientific | 2023 |
| Developments by Anderson Ltd | Construction | 2024 |
| Devlin Construction Ltd | Construction | 2025 |
| DF Research Limited | Professional & scientific | 2011 |
| DH Signal Testing Ltd | Professional & scientific | 2023 |
| Dhcw Trading Limited | Administrative & support | 2017 |
| Diables Rouges Ltd | Arts & recreation | 2014 |
| Diagnostic Solutions Ltd | Professional & scientific | 1992 |
| Diamond 50 RG Rentals Ltd | Transport & logistics | 2022 |
| Diamond Circle Weddings Ltd | Administrative & support | 2019 |
| Diamond Farm Equestrian Ltd | Agriculture & fishing | 2022 |
| Diamond Stores Ltd | Wholesale & retail | 2024 |
| Diane MAE Limited | Arts & recreation | 2004 |
| Digital Detective Group Limited | Professional & scientific | 2009 |
| Digital Network Distributions Invest Ltd | Arts & recreation | 2021 |
| Digital Network Distributions Ltd | Extraterritorial | 2021 |
| Dilek & Ozkan Associates Limited | Financial services | 2018 |
| Directtemping.Com LLP | | 2008 |
| Dirtbusters Oven Cleaning Supplies Ltd | Administrative & support | 2010 |
| Discovery Nursery Limited | Education | 2004 |
| Distribution AM Ltd | Extraterritorial | 2024 |
| Dizzy Entertainments Limited | Hospitality | 2025 |
| DJD Enterprises (Kent) Limited | Administrative & support | 2020 |
| DL Go Limited | Hospitality | 2022 |
| DMB Scaffolding (Kent) Limited | Construction | 2023 |
| DNA Global Business Ltd | Wholesale & retail | 2023 |
| Docbeecee Leadership Academy Ltd | Education | 2023 |
| Dockway Ltd | Real estate | 2013 |
| Dolittle Farm Ltd | Agriculture & fishing | 2023 |
| Domaine Gayda Limited | Wholesale & retail | 2024 |
| Domius Group Holdings Limited | Manufacturing | 2008 |
| Domo Elec Ltd | Other services | 2019 |
| Dour Park Ltd | Professional & scientific | 2015 |
| Dour Straits Limited | Households | 2004 |
| Dover Community Catering Ltd | Hospitality | 2019 |
| Dover Accountancy Ltd | Professional & scientific | 2010 |
| Dover Activity Parks CIC | Arts & recreation | 2020 |
| Dover AGE Concern Limited | Wholesale & retail | 1993 |
| Dover Arts Development Ltd | Arts & recreation | 2008 |
| Dover Athletic Community Trust | Arts & recreation | 2018 |
| Dover Athletic Football Club Limited | Arts & recreation | 1983 |
| Dover Barbers Kent Ltd | Other services | 2026 |
| Dover Barbers Ltd | Other services | 2021 |
| Dover Big Local CIC | Other services | 2020 |
| Dover Bronze AGE Boat Trust | Arts & recreation | 1994 |
| Dover Builders Ltd | Construction | 2024 |
| Dover Carpets Ltd | Wholesale & retail | 2024 |
| Dover Caterers Ltd | Hospitality | 2025 |
| Dover Chamber of Trade Limited | Construction | 2026 |
| Dover Chippy Ltd | Hospitality | 2026 |
| Dover Co-Living Ltd | Construction | 2018 |
| Dover Community Radio Community Interest Company | Administrative & support | 2011 |
| Dover Corner Shop Ltd | Wholesale & retail | 2025 |
| Dover Demolition Limited | Construction | 2010 |
| Dover Dentures Limited | Health & social care | 2010 |
| Dover Developments Limited | Construction | 2014 |
| Dover Driving School Ltd | Education | 2024 |
| Dover Fringe Ltd | Arts & recreation | 2025 |
| Dover Garage Services Ltd | Wholesale & retail | 2025 |
| Dover GAS Ltd | Construction | 2026 |
| Dover Gymnastics Club Limited | Arts & recreation | 2002 |
| Dover Haulage Ltd | Transport & logistics | 2019 |
| Dover House (GC) Limited | Health & social care | 2021 |
| Dover Insurance Services Limited | Financial services | 2007 |
| Dover Limited | Real estate | 2020 |