| Conscious Ventures Ltd | Information & communication | 2021 |
| Cornwall Express PVT Ltd | Wholesale & retail | 2023 |
| County Heights Limited | Wholesale & retail | 2023 |
| Cowan and Sons Construction Limited | Construction | 2015 |
| CPR Media Ltd | Information & communication | 2019 |
| CR8 Digital Design Ltd | Information & communication | 2024 |
| Craft Cocktail Merchant & Co Ltd | Manufacturing | 2019 |
| Crakemarsh Healthcare Limited | Professional & scientific | 2023 |
| Creating by Night Ltd | Professional & scientific | 2018 |
| Creative Minds Nurseries Network Ltd | Education | 2011 |
| CRF - Concepts Ltd | Administrative & support | 2018 |
| Crown Events Finglesham Ltd | Hospitality | 2025 |
| Crown Inn Finglesham Ltd | Hospitality | 2022 |
| Crown Lodges Finglesham Ltd | Hospitality | 2025 |
| CRS Homes (Kent) Ltd | Construction | 2021 |
| Crumble Cups Ltd | Hospitality | 2025 |
| Crushintons Limited | Construction | 2010 |
| CSG Accident Repair Centre Ltd | Wholesale & retail | 2012 |
| CT14.IT Solutions Ltd | Information & communication | 2014 |
| CTS Electrical Limited | Construction | 2000 |
| Customs Network Holdings Limited | Financial services | 2022 |
| Customs Network Limited | Professional & scientific | 2002 |
| CUT by Maton Ltd | Information & communication | 2024 |
| CW Roofing Ltd | Construction | 2023 |
| Cwhitt Ltd | Professional & scientific | 2011 |
| Cyber Agoge Limited | Information & communication | 2023 |
| Cybershed Technology Limited | Information & communication | 2021 |
| Cybye Limited | Information & communication | 2025 |
| D & a Cleaning Services (Residential) Limited | Administrative & support | 2019 |
| D & a Cleaning Services Limited | Administrative & support | 2016 |
| D & R Hospitality Ltd | Hospitality | 2019 |
| D J Edmonds Limited | Construction | 2003 |
| D Townend Plumbing Services Limited | Construction | 2005 |
| D Welch (Scaffolding) Limited | Construction | 1988 |
| Daisily Property Ltd | Real estate | 2020 |
| Daisy Renewables Ltd | Manufacturing | 2021 |
| Dalespay Ltd | Administrative & support | 2021 |
| DAN Trice Limited | Extraterritorial | 2000 |
| Danielle Relf Ltd | Arts & recreation | 2021 |
| Danieos Ltd | Hospitality | 2023 |
| Darrall and Company Ltd | Professional & scientific | 2009 |
| Darrel Relf Ltd | Professional & scientific | 2021 |
| Darwin Property Consultancy Ltd | Professional & scientific | 2025 |
| Daryl Gosden Limited | Construction | 2016 |
| Dawn Chorus Recording Company LLP | | 2012 |
| DCM Motorcycles Ltd | Wholesale & retail | 2011 |
| Ddag Ltd | Real estate | 2011 |
| Deal Kent Catering Ltd | Hospitality | 2024 |
| Deal and Walmer Chamber of Trade Limited | Other services | 1949 |
| Deal and Walmer Community Association | Hospitality | 2004 |
| Deal Arts Management CIC | Arts & recreation | 2007 |
| Deal Barbers Kent Ltd | Other services | 2024 |
| Deal Barbers SE Ltd | Other services | 2025 |
| Deal Betteshanger & Walmer Rugby Sports & Social Club Ltd | Arts & recreation | 2001 |
| Deal by the Beach Ltd | Wholesale & retail | 2025 |
| Deal Cars Ltd | Transport & logistics | 2010 |
| Deal Consulting Ltd | Professional & scientific | 2024 |
| Deal Convenient Store Limited | Real estate | 2017 |
| Deal Deli Ltd | Wholesale & retail | 2025 |
| Deal Direct Property Investments Limited | Real estate | 2019 |
| Deal Education Alliance for Learning Trust | Education | 2018 |
| Deal Film Festival Ltd | Information & communication | 2017 |
| Deal Handyman Management Limited | Construction | 2025 |
| Deal Kent Pride CIC | Arts & recreation | 2025 |
| Deal MOT Centre Limited | Professional & scientific | 2009 |
| Deal Museum Trust | Arts & recreation | 2000 |
| Deal Park Properties Limited | Real estate | 2021 |
| Deal Radio C.I.C. | Information & communication | 2017 |
| Deal Town Football Club (2001) Limited | Arts & recreation | 2001 |
| Deal Travel UK Ltd | Administrative & support | 2023 |
| Deal Vape Shop Ltd | Wholesale & retail | 2026 |
| Debby LEE Properties Limited | Administrative & support | 2000 |
| Deborah Jayne Ltd | Wholesale & retail | 2024 |
| Deco Masters Limited | Construction | 2022 |
| Deepak Sareen Associates Limited | Information & communication | 1983 |
| Demand Data Limited | Information & communication | 2020 |
| Deneland Ltd | Extraterritorial | 2026 |
| Denim TEE Fusion Limited | Wholesale & retail | 2025 |
| Denizen Works Ltd | Professional & scientific | 2010 |
| Derrick Developments (Kent) Ltd | Real estate | 2025 |
| Derrick Developments Ltd | Real estate | 2021 |
| Devsecai Limited | Information & communication | 2024 |
| DH2026 Limited | Professional & scientific | 2020 |
| Dial a DAD Handyman Services Ltd Ltd | Construction | 2026 |
| Dial a Pizza NOW Ltd | Hospitality | 2025 |
| Diamonds of Deal Ltd | Manufacturing | 2024 |
| Dida Sports Organisation C.I.C. | Health & social care | 2018 |
| Digital Direct Technologies Ltd | Information & communication | 2014 |
| Digital Nutmeg Limited | Information & communication | 2023 |
| Direct Cars (Taxi) Limited | Transport & logistics | 2010 |
| Direct Cars Management Limited | Transport & logistics | 2015 |
| Direct Pizza 4 YOU Ltd | Hospitality | 2018 |
| Dirty Pretty Pictures Ltd | Information & communication | 2010 |
| DJ Hogg Rail Ltd | Construction | 2018 |
| DJ Surveying Services Ltd | Professional & scientific | 2011 |
| DM Autos (Kent) Limited | Wholesale & retail | 2026 |
| DO WE Care? YES WE DO Ltd | Health & social care | 2019 |
| Domestic-Wizards Ltd | Administrative & support | 2020 |
| Dominikaannacleaners Ltd | Construction | 2022 |
| Domotica Ltd | Construction | 2011 |