| Classic Sports Cars Kent Limited | Wholesale & retail | 2022 |
| Classy Management Limited | Information & communication | 2025 |
| Claudia Knox Limited | Extraterritorial | 2023 |
| Clay Colour Works C.I.C. | Health & social care | 2012 |
| Claytonbrook Limited | Households | 1995 |
| CLB Legal Services Limited | Professional & scientific | 2015 |
| Clean Green Grass Group Limited | Administrative & support | 2025 |
| Clean Machine Garage & Industrial Services Ltd | Administrative & support | 2001 |
| Clean With US Ltd | Administrative & support | 2024 |
| Cleanheart Limited | Other services | 2019 |
| Cleaning to Perfection Ltd | Administrative & support | 2022 |
| Cleaning With Meaning Maidstone Ltd. | Administrative & support | 2025 |
| Cleanparkuk Limited | Other services | 2016 |
| Cleansed Ltd | Administrative & support | 2019 |
| Cleansmart Solutions Commercial Cleaning Limited | Administrative & support | 2015 |
| Clear Road Ltd | Extraterritorial | 2003 |
| Clear Skies Mental Health CIC | Health & social care | 2026 |
| Clear Vision Technologies Limited | Wholesale & retail | 2013 |
| Clear-It Rubbish Collection Limited | Water & waste | 2007 |
| Clearencezone Limited | Manufacturing | 2018 |
| Clearford Limited | Professional & scientific | 2011 |
| Cleartec Group Limited | Financial services | 2024 |
| Cleartec Limited | Administrative & support | 2020 |
| Clearway Group (Kent) Ltd | Administrative & support | 2025 |
| Clearway Traffic Solutions Ltd | Construction | 2010 |
| Clementine Associates Limited | Financial services | 2002 |
| Clenetix Limited | Information & communication | 2020 |
| Clergo Property Services Ltd | Real estate | 2020 |
| Clevedon House Management (Hartley) Ltd | Households | 2022 |
| Clews Enterprises Limited | Real estate | 1999 |
| CLG Electrical Limited | Professional & scientific | 2025 |
| Click Metrics Ltd | Information & communication | 2015 |
| Cliff Reeves Ltd | Information & communication | 2008 |
| Cliff Spacey Decorators Limited | Construction | 2018 |
| Clifton Properties (Brighton) Limited | Real estate | 2005 |
| Climate Change Agency C.I.C | Professional & scientific | 2009 |
| Clive Emson Auctioneers (West Country) Limited | Real estate | 2010 |
| CLM Servicess Ltd | Transport & logistics | 2021 |
| Clock House Farm Limited | Agriculture & fishing | 1952 |
| Clokes External Cleaning Ltd | Administrative & support | 2025 |
| Closer Labs Ltd | Information & communication | 2026 |
| Closeshotfilms Limited | Information & communication | 2025 |
| Cloudcube Limited | Wholesale & retail | 2026 |
| Cloudmaestro Limited | Professional & scientific | 2013 |
| Cloudyblew Ltd | Wholesale & retail | 2025 |
| Clover Connect Ltd | Information & communication | 2026 |
| Clover Index Limited | Extraterritorial | 2013 |
| Club Casuals Wear Ltd | Wholesale & retail | 2026 |
| Club DEL Domingo Ltd | Wholesale & retail | 2025 |
| Club Padel South East Ltd | Arts & recreation | 2025 |
| Clubbersreunite Limited | Real estate | 2003 |
| Clubclass Music Management Ltd | Arts & recreation | 2006 |
| Clubs Catering Limited | Hospitality | 2018 |
| Clucky Kent Ltd | Hospitality | 2023 |
| Clíodhna Clinic Limited | Health & social care | 2025 |
| CM People Ltd | Administrative & support | 2011 |
| CMD Monterey Ltd | Construction | 2020 |
| CMG Decorating Limited | Construction | 2025 |
| CMG Truck Services Ltd | Wholesale & retail | 2025 |
| CMI Trans Limited | Transport & logistics | 2020 |
| CMJ Brickwork and Scaffolding Ltd | Construction | 2015 |
| Cmrb Contracting Limited | Manufacturing | 2024 |
| CMT Collections Ltd | Construction | 2025 |
| Cncm Investment Company Limited | Financial services | 2026 |
| Cnic Films Limited | Information & communication | 2020 |
| Cnrr Group Ltd | Real estate | 2026 |
| Co Contracting Limited | Administrative & support | 2008 |
| Co-Co Consulting Limited | Administrative & support | 2006 |
| Co-Op Solutions Ltd | Professional & scientific | 2019 |
| Coach Execs Limited | Professional & scientific | 2016 |
| Coach House Maidstone Limited | Hospitality | 2019 |
| Coaching by Katie Limited | Arts & recreation | 2025 |
| Coast Transport Ltd | Transport & logistics | 2020 |
| Cobalt Forge Limited | Information & communication | 2025 |
| Coban & Sons Limited | Hospitality | 2025 |
| Cobbworks Ltd | Professional & scientific | 2026 |
| Cobens Capital Distribution Limited | Financial services | 2014 |
| Cobens Developments Limited | Construction | 2023 |
| Cobens Group Limited | Financial services | 2006 |
| Cobens Pension Administration Limited | Financial services | 2015 |
| Cobfields Cobbles Ltd | Construction | 2026 |
| Cobham & Dunwich Estates Ltd | Real estate | 2017 |
| Cobham and Oxshott Estates Limited | Real estate | 2000 |
| Cobnut Park Management Limited | Households | 2019 |
| Cobra Projects Ltd | Construction | 2011 |
| Cobtree Charity Trust Limited | Administrative & support | 1951 |
| Coburns Limited | Wholesale & retail | 1992 |
| Coceban Ltd | Construction | 2022 |
| Coconsultancy Ltd | Professional & scientific | 2010 |
| Codbites Limited | Hospitality | 2025 |
| Code and Theory London Limited | Professional & scientific | 2014 |
| Codeo Solutions Limited | Information & communication | 2023 |
| Codewise Ltd | Information & communication | 2022 |
| Codex Paving and Groundwork’S Limited | Professional & scientific | 2024 |
| Cognitech Data Systems Limited | Information & communication | 2026 |
| Cohesion Design Services Limited | Administrative & support | 2003 |
| Cohesion Interiors Limited | Real estate | 2018 |
| Cojan Ltd | Construction | 2024 |
| Coko Services Ltd | Information & communication | 2025 |
| Colbreay Group Limited | Professional & scientific | 2021 |