| County Fire Protection Limited | Other services | 1999 |
| County Solicitors Limited | Professional & scientific | 2016 |
| Court Lodge Barns Limited | Households | 2024 |
| Court Stairs Mews Limited | Professional & scientific | 2015 |
| Cover Holdings Limited | Financial services | 2021 |
| CPL Media Ltd | Information & communication | 2023 |
| CR Kettles Ltd | Wholesale & retail | 2025 |
| Crackin Holdings Limited | Real estate | 2024 |
| Craft Beer Festivals Limited | Hospitality | 2016 |
| Craftee Web Development Ltd | Information & communication | 2019 |
| Craftsigns Ltd | Manufacturing | 2017 |
| Craftwave Innovations Ltd | Information & communication | 2024 |
| Creativcampers Ltd | Administrative & support | 2025 |
| Creative CUT Ltd | Other services | 2025 |
| Creative Music Making Limited | Extraterritorial | 2017 |
| Crescent Estates Limited | Households | 1997 |
| Crescent Works Limited | Construction | 2025 |
| Crest Talent Partners Ltd | Professional & scientific | 2026 |
| Crestfall Ltd | Professional & scientific | 2025 |
| Crisis Board Room Limited | Manufacturing | 2014 |
| Crispin Finn Ltd | Professional & scientific | 2012 |
| Cromwell Mews Management Company (NO.2) Limited | Households | 1988 |
| Crucial Learning and Safety Services Limited | Professional & scientific | 2019 |
| Crusade Building Services Ltd | Construction | 2012 |
| Crystal Magick Wholesale Limited | Administrative & support | 2009 |
| Crystal Peake Publisher Ltd | Information & communication | 2018 |
| CS Heating & Plumbing Limited | Construction | 2009 |
| CS Plastics & Building Supplies Ltd | Wholesale & retail | 2026 |
| CSC Roofing and Renovations Ltd | Construction | 2026 |
| CSG Rail Ltd | Construction | 2024 |
| CSS Storage Solutions Ltd | Other services | 2013 |
| CT Rail & Property Solutions Limited | Construction | 2014 |
| CT12 Holdings Ltd | Real estate | 2015 |
| Culture JAM Media Limited | Information & communication | 2018 |
| Culture Wins Employees' Trustees Limited | Professional & scientific | 2018 |
| Culture Wins Limited | Financial services | 2016 |
| Cultured Publishing Limited | Information & communication | 2026 |
| Cuminte CU Minte Ltd | Real estate | 2021 |
| Cummins & Luca Limited | Professional & scientific | 2026 |
| Cummins Services Limited | Professional & scientific | 2026 |
| Curve Care Ltd | Health & social care | 2024 |
| Curve Consultancy Ltd | Professional & scientific | 2024 |
| Custom Made Golf Ltd | Manufacturing | 2026 |
| Custom Toys UK Limited | Wholesale & retail | 2015 |
| Customer Experience Services Limited | Information & communication | 2009 |
| Cutler Magazine Ltd | Information & communication | 2022 |
| CWF Fitting Limited | Construction | 2013 |
| Cyanic Services Ltd | Wholesale & retail | 2020 |
| D & S Plumbing & Heating Engineers Ltd | Construction | 2017 |
| D K Collections South East Limited | Administrative & support | 2024 |
| D K Tranfers Ltd | Transport & logistics | 2025 |
| D R Railway Ltd | Construction | 2016 |
| D&A Auto - Engineering Ltd. | Manufacturing | 2017 |
| D&A Utilities Ltd | Construction | 2025 |
| D&B Carpentry Ltd | Manufacturing | 2019 |
| D&D Brian Supply Ltd | Transport & logistics | 2024 |
| D&P (Fit-Out and General Building Contractor) Ltd | Construction | 2019 |
| D&R Lettings Ltd | Extraterritorial | 2019 |
| D&S Property Kent Ltd | Real estate | 2020 |
| D.J.W Decorating Ltd | Construction | 2019 |
| D3 Property Management Ltd | Real estate | 2025 |
| DAA Souvlaki Limited | Hospitality | 2025 |
| Dabble Solutions Ltd | Information & communication | 2026 |
| Dact Solutions Ltd | Professional & scientific | 2023 |
| Dahrigging Ltd | Construction | 2019 |
| DAJ Kent Limited | Financial services | 2017 |
| Dale Properties Kent Limited | Real estate | 2021 |
| Dali Ecommerce Ltd | Wholesale & retail | 2025 |
| Dalton Construction Projects Ltd. | Administrative & support | 2020 |
| Danger Productions Ltd | Professional & scientific | 2015 |
| Daniel Ford Hairdressing Limited | Other services | 2021 |
| Daniel James Electrical Contractors Ltd | Construction | 2024 |
| Danielle SP Hair Ltd | Other services | 2022 |
| Danny Perez Estate Agent Canterbury Limited | Real estate | 2024 |
| Dansway Communications Limited | Information & communication | 2003 |
| Dare Learning Ltd | Administrative & support | 2019 |
| Darish Ltd | Real estate | 2023 |
| Darish Petroleum Ltd | Wholesale & retail | 2024 |
| Dash Fleet Solutions Limited | Wholesale & retail | 2026 |
| Daskalov Limited | Construction | 2007 |
| Data Care Ltd | Information & communication | 2026 |
| Datachapp Limited | Administrative & support | 2014 |
| Davall Design Limited | Wholesale & retail | 2013 |
| Dave Lawrence Ltd | Construction | 2017 |
| David Spain & Co Ltd | Wholesale & retail | 2022 |
| Davies Cost Consultants Limited | Professional & scientific | 2025 |
| Dawo Limited | Professional & scientific | 2016 |
| Daxijack Investments Ltd | Real estate | 2023 |
| DB Copy Ltd | Professional & scientific | 2024 |
| DB Property Kent Ltd | Real estate | 2025 |
| DB Workplace Solutions Ltd | Administrative & support | 2020 |
| DBP Deal Limited | Hospitality | 2020 |
| DBS Nexus Ltd | Information & communication | 2026 |
| DD Aviation Limited | Administrative & support | 2015 |
| DDP Projects Limited | Real estate | 2020 |
| DE Montfort Park (Ashford - Phase 1) Management Company Limited | Households | 2004 |
| Deal Beach Parlours Limited | Financial services | 2017 |
| Deal Holiday Lets Ltd | Real estate | 2022 |
| Decadence Construction Ltd | Construction | 2018 |
| Dekkor Home Limited | Manufacturing | 2022 |