| City Livery Yacht Club Limited | Arts & recreation | 2019 |
| CK Norton Limited | Arts & recreation | 2024 |
| Clark Inns Limited | Hospitality | 2003 |
| Class Gaming Ltd | Wholesale & retail | 2022 |
| Clay Works for Children Limited | Information & communication | 2013 |
| Clear Picture Services Limited | Information & communication | 2008 |
| Clear View Glazing South East Ltd | Construction | 2026 |
| Clearscape Communications Ltd | Professional & scientific | 2010 |
| Clearvale Solutions Ltd | Water & waste | 2025 |
| Clever Property Management Ltd | Real estate | 2021 |
| Clgdottv Limited | Information & communication | 2014 |
| Client Heroes Ltd | Professional & scientific | 2025 |
| Cliffside (Cliftonville) Management Company Ltd | Other services | 2005 |
| Clifftop Construction Ramsgate Limited | Construction | 2025 |
| Clifton Mortgage Consulting LLP | | 2016 |
| Clima Serv Ltd | Construction | 2025 |
| Clinx Research & Biosciences Ltd | Information & communication | 2026 |
| Cliveden Place Management Company (Broadstairs) Limited | Households | 2002 |
| Cloisters (Ramsgate) Residents Company Limited(The) | Households | 1982 |
| Clonfert Solutions Limited | Education | 2013 |
| Close Ltd | Wholesale & retail | 2025 |
| Cloud Based Accounting Limited | Professional & scientific | 2011 |
| CLOUD9 Wellness Hub Ltd | Health & social care | 2018 |
| CLR Heating Services Ltd | Construction | 2025 |
| Clse Lettings Ltd | Transport & logistics | 2025 |
| CLT Maintenance Ltd | Construction | 2023 |
| Club 13 Fitness Ltd | Arts & recreation | 2026 |
| Cluck and COW Ltd | Hospitality | 2025 |
| Clwsurfaces Ltd | Construction | 2017 |
| Co-Arch Ltd | Professional & scientific | 2019 |
| Coast 2 Coast Living Limited | Construction | 2020 |
| Coastal Bar (Kent) Ltd | Hospitality | 2019 |
| Coastal Carpets & Flooring Ltd | Construction | 2019 |
| Coastal Commercial Limited | Financial services | 2023 |
| Coastal Community Learning CIC | Education | 2025 |
| Coastal Construction (South East) Limited | Administrative & support | 1992 |
| Coastal Developments Greenhill Ltd | Construction | 2010 |
| Coastal Developments Limited | Real estate | 1992 |
| Coastal Glaze Ltd | Construction | 2019 |
| Coastal Homes (Kent) Ltd | Real estate | 2020 |
| Coastal Host Ltd | Real estate | 2020 |
| Coastal Lettings (Kent) Ltd | Real estate | 2021 |
| Coastal Renovations Limited | Construction | 2023 |
| Coastal Restaurants (Paul's) Limited | Hospitality | 2025 |
| Coastal Restaurants (ST Mildred's Bay) Limited | Hospitality | 2025 |
| Coastal Restaurants Limited | Hospitality | 2025 |
| Coastguards Management Ltd | Households | 2026 |
| Cocel Limited | Hospitality | 2019 |
| Coco Ramsgate Ltd | Hospitality | 2024 |
| Codcrafted Limited | Professional & scientific | 2024 |
| Codeculture Limited | Information & communication | 2009 |
| Coffea Arabica Limited | Hospitality | 2012 |
| Cohn Consulting Limited | Other services | 2024 |
| Coldswood Farm Livery Ltd | Agriculture & fishing | 2024 |
| Coldswood Motors Limited | Wholesale & retail | 2013 |
| Coldswood Properies Limited | Real estate | 2025 |
| Colgate Garage Doors Ltd | Construction | 2006 |
| Colin Bradley Art Limited | Arts & recreation | 2016 |
| Colourchoice Upvc Limited | Manufacturing | 2008 |
| Community Careline Services Medway Limited | Health & social care | 2013 |
| Compass Internet Limited | Information & communication | 2002 |
| Complete Car Sales Limited | Wholesale & retail | 2003 |
| Complete Carpentry Kent Ltd | Construction | 2018 |
| Complete Plumbing & Heating Kent Ltd | Construction | 2019 |
| Complete Renovation Contractors Limited | Construction | 2019 |
| Composite Resin Developments Limited | Manufacturing | 2007 |
| Comptonhall Limited | Professional & scientific | 2011 |
| Computer Controlled Cutting Limited | Manufacturing | 2021 |
| Connections 4 YOU Limited | Transport & logistics | 2003 |
| Construction Services Team Ltd | Construction | 2025 |
| Consulting Quest Limited | Professional & scientific | 2014 |
| Consumer Focused Retail Ltd | Wholesale & retail | 2024 |
| Convent Road ACP Limited | Construction | 2019 |
| Conversion Makers Limited | Professional & scientific | 2015 |
| Cooper Carpentry and Construction Ltd | Construction | 2020 |
| Coopers Cars Ltd | Wholesale & retail | 2020 |
| COP Shop UK Limited | Wholesale & retail | 2003 |
| Coppard Digital Ltd | Information & communication | 2022 |
| Copper Oak Building Services Ltd | Construction | 2020 |
| COR Meum Counselling Ltd | Health & social care | 2023 |
| COR Services Limited | Construction | 2013 |
| Core Operations Ltd | Professional & scientific | 2025 |
| Core Property Kent Limited | Real estate | 2026 |
| Corner House Canterbury Ltd | Hospitality | 2017 |
| Corner House Properties (Kent) Limited | Real estate | 2025 |
| Cornwall Dreams Limited | Real estate | 2025 |
| Corporate Creations Limited | Real estate | 2014 |
| Corporate Entertainment Professionals Ltd | Arts & recreation | 2011 |
| Corringham Holdings 1 Ltd | Construction | 2023 |
| Corringham Holdings 2 Ltd | Construction | 2023 |
| Corsair Ltd | Administrative & support | 2016 |
| Cosmedi Limited | Wholesale & retail | 2017 |
| Cosmic Buzz Limited | Information & communication | 2024 |
| Costello Skincare Ltd | Manufacturing | 2025 |
| Counties & Capital Consulting Ltd | Professional & scientific | 2020 |
| Counties & Capital Holdings Ltd | Financial services | 2022 |
| Counties & Capital Land & New Homes Ltd | Construction | 2022 |
| Counties & Capital Management Ltd | Professional & scientific | 2025 |
| County Build Ltd | Construction | 2023 |
| County Construction (Kent) Ltd | Construction | 2005 |