| Chinese Cate Cambridge Ltd | Hospitality | 2015 |
| Chingene Ltd | Manufacturing | 2026 |
| Chinova Systems Ltd | Information & communication | 2026 |
| Chipflow Limited | Information & communication | 2021 |
| Chiplab Ltd | Professional & scientific | 2022 |
| Chipletti Ltd | Information & communication | 2024 |
| Chipmunk WD292 Ltd | Manufacturing | 2022 |
| Chips and Tracks - PCB Engineering Ltd | Professional & scientific | 2026 |
| Chirita Composites Ltd | Manufacturing | 2024 |
| Chitomerics Limited | Manufacturing | 2012 |
| Chittering Park Limited | Hospitality | 2013 |
| CHITU91 Ltd | Manufacturing | 2024 |
| Chivers Farming LLP | | 2012 |
| Chivers Farms (Hardington) LLP | | 2018 |
| Chivers Farms Group Limited | Agriculture & fishing | 2023 |
| Chivers Farms Limited | Agriculture & fishing | 1995 |
| CHK Holding Co., Ltd. | Extraterritorial | 2023 |
| Chlst Company Ltd | Manufacturing | 2025 |
| Choanaco Limited | Wholesale & retail | 2023 |
| Choate Technology Services Limited | Professional & scientific | 1998 |
| Chocinter Co., Limited | Wholesale & retail | 2023 |
| Chocolate Limited | Administrative & support | 1999 |
| Choice Consultancy Ltd | Professional & scientific | 2026 |
| Choice Investment Holdings Ltd | Real estate | 2025 |
| Choicezhang Trade Co., Limited | Wholesale & retail | 2023 |
| Choirfixer Limited | Arts & recreation | 2010 |
| Chole Trading Co., Ltd | Wholesale & retail | 2022 |
| Choo Property Group Ltd | Hospitality | 2025 |
| Chorus Music Therapy CIC | Education | 2025 |
| Chrematic Ltd | Transport & logistics | 2024 |
| Chrib Ltd | Professional & scientific | 2018 |
| Chris 2014 Limited | Transport & logistics | 2016 |
| Chris Anderson Residential Development Land Agent Limited | Real estate | 2011 |
| Chris Baker Light Haulage and Removals Limited | Transport & logistics | 2008 |
| Chris Harrington Transport Limited | Administrative & support | 2010 |
| Chris Howard Ltd | Professional & scientific | 2022 |
| Chris LOW Architecture Ltd | Professional & scientific | 2016 |
| Chris Warner Broadcast Services Limited | Professional & scientific | 2006 |
| Chris Wright Fencing Limited | Construction | 2019 |
| Chrishall Grange Water Limited | Water & waste | 2023 |
| Christ's College Enterprises Limited | Real estate | 2003 |
| Christ's College Trading Limited | Hospitality | 2015 |
| Christ's Court Estate & Management Company Limited | Other services | 2004 |
| Christian Biotechnology Co., Ltd | Wholesale & retail | 2024 |
| Christian Blind Mission (United Kingdom) Limited | Health & social care | 1996 |
| Christina Beauty Ltd | Other services | 2024 |
| Christina Perritt Practice Ltd | Health & social care | 2017 |
| Christine Webster Care Ltd | Health & social care | 2009 |
| Christopher Robert Willett Limited | Extraterritorial | 2024 |
| Christy-Ann Limited | Wholesale & retail | 2018 |
| Chroen Global Alloy Ltd | Manufacturing | 2025 |
| Chronos Research Limited | Education | 1996 |
| Chronosight Ltd | Information & communication | 2026 |
| Chrysalis Capability and Training Ltd | Professional & scientific | 2017 |
| Chrysenteron Engineering Ltd | Professional & scientific | 2022 |
| CHS Cleaning Hygiene Safety Limited | Administrative & support | 2009 |
| Chsk Ltd | Information & communication | 2023 |
| Chuangyi Jewelry Co., Ltd | Wholesale & retail | 2021 |
| Chudleigh House Limited | Real estate | 2022 |
| Chum Education Ltd | Education | 2022 |
| Chunk Group Ltd | Information & communication | 2023 |
| Chunlei Textile Co., Ltd | Wholesale & retail | 2020 |
| Church Brothers Limited | Wholesale & retail | 2025 |
| Church END Consultants Ltd | Information & communication | 2024 |
| Church Farm Field Residents Management Company Limited | Households | 2021 |
| Church View 341 London Road Limited | Households | 2004 |
| Churchgate Heritage Properties Ltd | Real estate | 2026 |
| Churchill Conferences Limited | Hospitality | 1993 |
| Churchill Management Services Limited | Administrative & support | 1977 |
| Churchill Mortgages Ltd | Financial services | 2015 |
| Churchley Investment Properties Limited | Real estate | 2021 |
| Churton Master Thatchers Ltd. | Construction | 2010 |
| CHY Visuals Ltd | Information & communication | 2025 |
| Chyng Yang Trading Co., Ltd | Manufacturing | 2025 |
| CI Move Removals Ltd | Transport & logistics | 2023 |
| Ciampa & Sons Ltd | Construction | 2021 |
| Ciao Group UK Ltd | Hospitality | 2024 |
| Cicek Grill Ltd | Hospitality | 2023 |
| Cicek Properties Ltd | Real estate | 2021 |
| Cicfiii GP LLP | | 2025 |
| Cicfof Limited | Financial services | 2023 |
| Cicgp Co-Invest LLP | | 2022 |
| Cicgp LLP | | 2020 |
| Cicof GP LLP | | 2024 |
| Cicof I LP | | 2024 |
| Cider BIO Limited | Professional & scientific | 2024 |
| Cieves Limited | Health & social care | 2002 |
| Cifci Takeaway Limited | Hospitality | 2020 |
| CIHAN27 Limited | Hospitality | 2025 |
| Cikaco Limited | Wholesale & retail | 2024 |
| Cimian Ltd | Professional & scientific | 2009 |
| Cimomount Electronics Co., Limited | Wholesale & retail | 2023 |
| Cinderella Ball Gowns Limited | Wholesale & retail | 2014 |
| Cinderfield Group Limited | Construction | 2025 |
| Cindy & C Ltd | Wholesale & retail | 2021 |
| Cindy Maddrell Consulting Ltd | Professional & scientific | 2026 |
| Cine Glaze Limited | Information & communication | 2024 |
| Cine Sales | Information & communication | 2011 |
| Cinema Cannaregio Ltd | Information & communication | 2008 |
| CINEMA8 Limited | Information & communication | 2021 |