| Caroline's Club Limited | Information & communication | 2021 |
| Carpet Contractors Limited | Administrative & support | 2004 |
| Carter James Consulting Ltd | Professional & scientific | 2024 |
| Carylls Impact Advisors Limited | Real estate | 2024 |
| Carylls Impact Holdings Limited | Real estate | 2024 |
| Carylls Impact Management Limited | Real estate | 2024 |
| Carylls Meadow Residents Limited | Households | 2012 |
| Casbell Concepts Ltd | Construction | 2020 |
| Case European Channel Sales Limited | Information & communication | 2013 |
| Castel Salbek Limited | Extraterritorial | 2016 |
| Castle Pension Trustees Limited | Professional & scientific | 2012 |
| Casual Brothers Ltd | Information & communication | 2010 |
| Catalyst for Homes CIC | Administrative & support | 1994 |
| Catalyx Partners Ltd | Financial services | 2026 |
| CB Wealth Ltd | Other services | 2019 |
| CBB Holdings Ltd | Financial services | 2019 |
| CD Investment Management Limited | Real estate | 2019 |
| Cdsa Ltd | Professional & scientific | 2025 |
| CE-22 Consulting Ltd | Professional & scientific | 2022 |
| Cealto Limited | Professional & scientific | 2023 |
| Cedarford Ltd | Real estate | 2022 |
| Cedarwood Construction & Roofing Limited | Construction | 2007 |
| CEE Cees Holdings Ltd | Other services | 2025 |
| Celand Holdings Ltd | Real estate | 2022 |
| Celestia Limited | Information & communication | 1997 |
| Celestial Accounting Ltd | Professional & scientific | 2012 |
| Celtic Soul Ltd | Information & communication | 2025 |
| Cen-Calc Limited | Professional & scientific | 2023 |
| Censereum Limited | Information & communication | 2025 |
| Centor Publishing Ltd. | Information & communication | 1998 |
| Centricity Brokers Ltd | Financial services | 2021 |
| Centurion Management Systems Limited | Information & communication | 1995 |
| Centurion Property Investments Limited | Real estate | 2004 |
| Century Star (KG) Limited | Real estate | 2021 |
| Ceramic Shack Limited | Wholesale & retail | 2013 |
| Cerberus Black Ltd | Professional & scientific | 2009 |
| Ceres Holdings International Limited | Professional & scientific | 2022 |
| Ceres Intellectual Property Company Limited | Professional & scientific | 2005 |
| Ceres Power Holdings PLC | Professional & scientific | 2004 |
| Ceres Power Intermediate Holdings Limited | Professional & scientific | 2014 |
| Ceres Power Licence Company Limited | Professional & scientific | 2019 |
| Ceres Power Limited | Professional & scientific | 2001 |
| Cervell Limited | Other services | 2012 |
| Ceylon Master Gems UK Ltd | Wholesale & retail | 2026 |
| Ceylon Tea Boutique UK Limited | Wholesale & retail | 2026 |
| Cftm Holdings Limited | Administrative & support | 2016 |
| CGA Warren Park Limited | Financial services | 2004 |
| CGB Consultancy Limited | Administrative & support | 2013 |
| Cgrc Consulting Limited | Professional & scientific | 2017 |
| Cgsf Consultants Limited | Hospitality | 2024 |
| Chaihaus UK Ltd | Hospitality | 2025 |
| Chainfree Property Limited | Real estate | 2024 |
| Chainge Consulting Limited | Administrative & support | 2011 |
| Challenges VS Opportunities Ltd | Professional & scientific | 2019 |
| Champall Consultancy Limited | Professional & scientific | 2011 |
| Channel 28 Ltd | Information & communication | 2012 |
| Chantry Court (Broadbridge Heath) Management Company Limited | Households | 2019 |
| Charging Universe Ltd | Information & communication | 2023 |
| Charles & Adams LLP | | 2024 |
| Charles Duffy Aviation Limited | Professional & scientific | 2015 |
| Charles KM New Ltd | Real estate | 2016 |
| Charles Lancaster (Rifle Makers) Limited | Manufacturing | 2009 |
| Charles Lancaster GUN & Riflemakers Limited | Manufacturing | 2010 |
| Charles Lancaster Limited | Manufacturing | 1984 |
| Charles Park Search and Selection Limited | Administrative & support | 2009 |
| Charlie D Limited | Hospitality | 2005 |
| Charlotte Place LP | | 2019 |
| Charlotte Vohtz Limited | Other services | 2019 |
| Chart Strategies Limited | Financial services | 2010 |
| Chart TL Capital Limited | Financial services | 2009 |
| Charterhouse Private Equity Limited | Financial services | 2013 |
| Chat TPK Productions Limited | Information & communication | 2025 |
| Chauffeurs-Adhoc Ltd | Transport & logistics | 2023 |
| Chef's Kiss Ltd | Hospitality | 2026 |
| Chefworks Limited | Hospitality | 2026 |
| Chelsea Carefree Ltd | Manufacturing | 2020 |
| Chelsea Wine Fair Ltd | Hospitality | 2012 |
| Cheltwest Limited | Real estate | 2025 |
| Chennells Brook Management Company Limited | Real estate | 1997 |
| Chennells Brook Retail Management Company Limited | Real estate | 1998 |
| Cheryl Wills Limited | Information & communication | 2018 |
| Chess Dynamics Limited | Manufacturing | 1999 |
| Chesswall Limited | Construction | 1987 |
| Chesterman Holdings Limited | Real estate | 2024 |
| Chesterman Residential Limited | Real estate | 2025 |
| Chesworths Commercial Limited | Real estate | 2024 |
| Chesworths Estate Agents Ltd | Real estate | 2015 |
| Chesworths Lettings Limited | Real estate | 2018 |
| Chichester Sports Consulting Limited | Professional & scientific | 2024 |
| Chichester Student LET Limited | Real estate | 2023 |
| Chiddingfold Village Cemetery Limited | Other services | 2001 |
| Children of Promise | Health & social care | 2011 |
| Chimecourt Limited | Professional & scientific | 2003 |
| China Brasserie Limited | Hospitality | 2024 |
| China Rose Transport Ltd | Administrative & support | 2016 |
| CHJ Groundworks Ltd | Construction | 2020 |
| Chord Event Limited | Administrative & support | 2016 |
| Chord Industry Limited | Extraterritorial | 2023 |
| Chordline Limited | Other services | 1991 |
| Chris Bulezuik Photography Limited | Professional & scientific | 2026 |