| Chiltern Food Group Ltd | Wholesale & retail | 2019 |
| Chiltern Jewellers Ltd | Extraterritorial | 2003 |
| Chiltern Magazine Services Limited | Information & communication | 1996 |
| Chiltern Maritime Limited | Administrative & support | 1986 |
| Chiltern Quality Foods Limited | Wholesale & retail | 1989 |
| Chiltern Valley Developments Limited | Construction | 2017 |
| Chime Consultancies Limited | Real estate | 2014 |
| China and Africa International Limited | Professional & scientific | 2025 |
| China Connection Properties Limited | Real estate | 2018 |
| Chind Ltd | Health & social care | 2023 |
| Chip 'N' Sail Ltd | Hospitality | 2024 |
| Chipet Care and Sevices Limited | Health & social care | 2020 |
| Chipmonks Pre-School Limited | Education | 2014 |
| Chique Homes Ltd | Hospitality | 2023 |
| Chique Makeovers & Photography Limited | Other services | 2014 |
| Chique Properties Ltd | Hospitality | 2018 |
| Chiqy Ltd | Wholesale & retail | 2020 |
| Chirigovero Ltd | Health & social care | 2025 |
| Chirita Imperial Ltd | Transport & logistics | 2020 |
| Chiropractic Defence Union Limited | Health & social care | 2021 |
| Chiswell Green Dental Centre Limited | Health & social care | 2012 |
| Chitsauto Ltd | Wholesale & retail | 2024 |
| Chittco Ltd | Professional & scientific | 2024 |
| Chizzy Family Venture Ltd | Health & social care | 2015 |
| CHK IT Ltd | Professional & scientific | 2020 |
| Chlocam Ltd | Manufacturing | 2026 |
| CHM (MK) Limited | Professional & scientific | 2006 |
| Cho-Zen Property Ltd | Real estate | 2023 |
| Choice Fitness Ltd | Wholesale & retail | 2020 |
| Choice Holdings (UK) Limited | Water & waste | 2012 |
| Choice Packaging Solutions Limited | Water & waste | 1997 |
| Choice Trading International Limited | Water & waste | 2004 |
| Choice Waste Management Ltd | Water & waste | 2019 |
| Choksi & Sons Ltd | Real estate | 2025 |
| Chommzy Care Services Limited | Health & social care | 2016 |
| Chonguk Ltd | Real estate | 2023 |
| Choose Alex Ltd | Transport & logistics | 2025 |
| Choose Your Future Group Ltd | Education | 2019 |
| Chorus Club Limited | Information & communication | 2024 |
| Chosen Transport Ltd | Transport & logistics | 2019 |
| Chrilisa Services Ltd | Administrative & support | 2019 |
| Chris & Kosta Cleaning Services Ltd | Administrative & support | 2017 |
| Chris and JOE Limited | Hospitality | 2025 |
| Chris Ingram Investments Limited | Financial services | 2024 |
| Chris Reid Consultancy Limited | Professional & scientific | 2015 |
| Chrisam Gardens Limited | Administrative & support | 2018 |
| Chrisdouka Ltd | Hospitality | 2024 |
| Chrislyn Limited | Professional & scientific | 2014 |
| Christ Liberty World Evangelical Ministry CIC | Education | 2025 |
| Christensen Creative Limited | Information & communication | 2016 |
| Christian Residential Network | Other services | 1984 |
| Christian Supply Chain Buying Group UK Limited | Administrative & support | 1991 |
| Christiana Tomo Private Care Ltd | Health & social care | 2023 |
| Christians Alight Limited | Wholesale & retail | 2002 |
| Christie & Co (Holdings) Limited | Financial services | 2001 |
| Christie Group Central Services Ltd | Professional & scientific | 2002 |
| Christie Intruder Alarms Limited | Extraterritorial | 2010 |
| Christine Care Limited | Health & social care | 2022 |
| Christine Newton Management & Consulting Limited | Administrative & support | 2022 |
| Christof Walter Consulting Ltd | Extraterritorial | 2012 |
| Christopher Hyde Limited | Wholesale & retail | 1995 |
| Christy Media Americas Ltd | Administrative & support | 2025 |
| Christy Media Solutions Limited | Administrative & support | 2005 |
| Chromatical Enterprises Limited | Information & communication | 2016 |
| Chrome Consulting Limited | Information & communication | 2013 |
| Chrstphr Music Production Limited | Arts & recreation | 2025 |
| Chrysalis Pensions Limited | Professional & scientific | 2009 |
| Chrysalis Trustees Limited | Extraterritorial | 2009 |
| Chrysoula Gergou Ltd | Professional & scientific | 2025 |
| Chrystal Page Consultants Limited | Administrative & support | 2010 |
| Chrystie Savage Limited | Financial services | 2011 |
| CHS Distributors Hospitality Ltd | Wholesale & retail | 2023 |
| CHU KUN CAI Ltd. | Wholesale & retail | 2025 |
| Chuanghe International Trade Co., Ltd. | Wholesale & retail | 2025 |
| Chubb Software Services Limited | Information & communication | 2025 |
| Chubby Fellow Ltd | Hospitality | 2020 |
| Chunk Healthcare Limited | Health & social care | 2026 |
| Church Attorney & Consultancy Ltd | Professional & scientific | 2024 |
| Church END Services Limited | Information & communication | 2016 |
| Church Farm Ventures Ltd | Administrative & support | 2024 |
| Church Street Minimarket Limited | Wholesale & retail | 2026 |
| Churchill Business Consulting Limited | Professional & scientific | 2022 |
| Churchill Cleaning Services Limited | Professional & scientific | 1988 |
| Churton House Services Limited | Health & social care | 2023 |
| Chutneys & Tiffin Ltd | Hospitality | 2018 |
| CI and D Limited | Other services | 2011 |
| CI Nottingham Ltd | Wholesale & retail | 2007 |
| Cial Serv Limited | Transport & logistics | 2018 |
| Cicero Impex Ltd | Wholesale & retail | 2020 |
| Cici Consulting Ltd | Information & communication | 2012 |
| Cicilia Limited | Extraterritorial | 2023 |
| Cicor UK Ltd | Manufacturing | 2018 |
| Cicor UK Properties Ltd | Construction | 1946 |
| Cida Investments Limited | Financial services | 2024 |
| Cidextech Ltd | Information & communication | 2024 |
| Cidori Holdings Limited | Professional & scientific | 2018 |
| Cidt International (UK) Ltd | Real estate | 2021 |
| Cigdem Simsek Ltd | Construction | 2019 |
| Cigg Ltd | Health & social care | 2024 |
| Cimar Limited | Professional & scientific | 2014 |