| Crest Retail Limited | Wholesale & retail | 2007 |
| Cresta Properties Limited | Real estate | 2015 |
| Crestdean Limited | Other services | 2014 |
| Crestwood Construction Group Ltd | Construction | 2026 |
| Cricket Leaders Community Interest Company | Arts & recreation | 2017 |
| Crimson Starfish Limited | Wholesale & retail | 2016 |
| Criscom LLP | | 2008 |
| Crisp Productions Ltd | Information & communication | 2014 |
| Crissu Limited | Hospitality | 2019 |
| Crop Hair Limited | Other services | 2018 |
| Cross Chunnel Investments Limited | Real estate | 2007 |
| Crossways Coffee Ltd | Hospitality | 2019 |
| Crowborough Mountain Bike Club Ltd | Arts & recreation | 2019 |
| Crowborough Podiatry and Wellness Ltd | Health & social care | 2025 |
| Crowe & Co. Limited | Professional & scientific | 2021 |
| Crowhurst Cars Limited | Wholesale & retail | 2006 |
| Crown of Shoreham Ltd | Hospitality | 2026 |
| CRP Consultancy Services Limited | Professional & scientific | 2007 |
| CRT Carpentry & Joinery Limited | Construction | 2011 |
| Crumb & GET IT LLP | | 2025 |
| Cryojuvenate UK Ltd | Health & social care | 2012 |
| Cryojuvenate Wellness Ltd | Health & social care | 2023 |
| Crypticlock Ltd | Information & communication | 2026 |
| Crystal Pools Services Ltd | Other services | 2005 |
| Csdi Engineering Ltd | Professional & scientific | 2020 |
| Csjones Limited | Financial services | 2019 |
| CSL Systems LLP | | 2024 |
| CSP Powder Coating Ltd | Other services | 2020 |
| CTD Projects Limited | Information & communication | 2017 |
| CTF Architecture Ltd | Professional & scientific | 2020 |
| Ctkc Holdings Ltd | Financial services | 2023 |
| CTP Consulting Engineers International Ltd | Professional & scientific | 2018 |
| Cubed Strategic Limited | Professional & scientific | 2020 |
| Cuddlyfm Limited | Professional & scientific | 2006 |
| Cudham Aviation and Engineering Ltd | Professional & scientific | 2026 |
| Cudham Community Centre Trust | Other services | 2010 |
| Cullinan Limited | Real estate | 2000 |
| Cullinan Properties Limited | Real estate | 2020 |
| Cullum Capital Investments LLP | | 2021 |
| Cullum Commercial Properties LLP | | 2006 |
| Cullum Family Trust | Professional & scientific | 2006 |
| Cullum White Properties UK Limited | Real estate | 2023 |
| Cully Property Group Ltd | Households | 2025 |
| Culture-Conscious International Ltd | Administrative & support | 2017 |
| Cups and Pups Ltd | Hospitality | 2025 |
| Curoxa Ltd | Health & social care | 2026 |
| Currenexis Holdings Ltd | Financial services | 2025 |
| Current Building Services Limited | Construction | 2019 |
| Current Installations Electrical Limited | Construction | 2010 |
| Curwen Capital Partners LLP | | 2024 |
| Cute Butter Ltd | Manufacturing | 2022 |
| Cute Tarantula Limited | Information & communication | 2018 |
| CVT Advisory Ltd | Professional & scientific | 2024 |
| CW Legal UK Limited | Professional & scientific | 2009 |
| CW Padel LLP | | 2026 |
| Cybersentrx Limited | Information & communication | 2026 |
| Cyentia Biosource Ltd | Professional & scientific | 2025 |
| Czech Comms Ltd | Professional & scientific | 2021 |
| D & F Professional Services Ltd. | Information & communication | 2013 |
| D & H Property Group Limited | Real estate | 2025 |
| D & M Incorporated Ltd | Wholesale & retail | 2025 |
| D & R Cleaning Company Limited | Administrative & support | 2008 |
| D a C Sales & Consulting Limited | Financial services | 2008 |
| D G Autos Limited | Wholesale & retail | 2005 |
| D Sambuk Consulting Ltd | Professional & scientific | 2026 |
| D V Facilities Management Limited | Other services | 2022 |
| D&A Works Ltd | Other services | 2016 |
| D&O Asset Holdings Ltd | Real estate | 2026 |
| D.E.M.U.S Property Limited | Real estate | 2024 |
| D.P.T. Holdings Ltd | Professional & scientific | 2020 |
| D4BSX Properties Ltd | Real estate | 2023 |
| Dafisa International Eurotrust (UK) Ltd. | Financial services | 1992 |
| Dagger Holdings International Limited | Professional & scientific | 2005 |
| Dagger Transit Limited | Extraterritorial | 2012 |
| Daley Design Solutions Ltd | Other services | 2013 |
| Dance Expressions Limited | Arts & recreation | 2011 |
| Dandyfoot Services Limited | Professional & scientific | 2019 |
| Danemark Consultants Limited | Professional & scientific | 2009 |
| Danewest Automotive Ltd | Extraterritorial | 2013 |
| Daniellegough Ltd | Administrative & support | 2024 |
| Danish Collection Limited | Wholesale & retail | 2003 |
| Danish Concept Stores Limited | Manufacturing | 2008 |
| Danny K Solutions Limited | Extraterritorial | 2014 |
| Darkstar Ltd | Hospitality | 2024 |
| Dart Motorsport Limited | Wholesale & retail | 2021 |
| Dart Racing Limited | Administrative & support | 2019 |
| Dartford Road Management Limited | Households | 1980 |
| Dartmoor Lodges Limited | Hospitality | 2021 |
| Dartmouth Trustees Limited | Professional & scientific | 2003 |
| Dash 2 (Kent) Limited | Transport & logistics | 2008 |
| Data Proof Ltd | Professional & scientific | 2025 |
| Dataio Limited | Extraterritorial | 2008 |
| Datascone Ltd | Information & communication | 2022 |
| David Braithwaite Consultancy Ltd | Professional & scientific | 2019 |
| David Brown Hardwood Floors Limited | Extraterritorial | 2001 |
| David Brown Private Finance Limited | Financial services | 2016 |
| David Brown Wood Floors Limited | Construction | 1998 |
| David Freedman Ltd. | Information & communication | 1994 |
| David Perry Marine Limited | Transport & logistics | 2018 |
| David Reading Consulting Limited | Professional & scientific | 2017 |