| Cedartek Limited | Manufacturing | 2014 |
| Cedarwood Healthcare Ltd | Health & social care | 2025 |
| Ceebili Services Ltd | Construction | 2014 |
| Ceh&W Ltd | Health & social care | 2012 |
| Celestial Search Limited | Administrative & support | 2025 |
| Centauro Landscaping Ltd | Administrative & support | 2025 |
| Centia Ltd | Administrative & support | 2010 |
| Century Gardens (Barnham) Management Company Limited | Households | 2025 |
| Cerit Limited | Hospitality | 2025 |
| Certax Limited | Administrative & support | 2012 |
| Cervello Financial Planning Limited | Financial services | 2011 |
| Cf&L Limited | Financial services | 2007 |
| CFH Projects Limited | Information & communication | 2024 |
| CFL Group Ltd | Professional & scientific | 2013 |
| Chadwicks Farm Shop Limited | Hospitality | 2019 |
| Chainfreesolutions Ltd | Real estate | 2021 |
| Chalfont (London) Limited | Hospitality | 2000 |
| Chalkwell Auctions Limited | Wholesale & retail | 1993 |
| Chalkwell Bay Management Company Limited | Households | 2014 |
| Chalkwell Partners Limited | Extraterritorial | 2015 |
| Chalkwell Ventures Limited | Financial services | 2015 |
| Champion Corner Ltd | Education | 2025 |
| Chancery Fields (Chorley) Management Company Limited | Households | 2015 |
| Changing Room Essentials Ltd | Wholesale & retail | 2021 |
| Chankov Ltd | Information & communication | 2016 |
| Chaos by Design Ltd | Construction | 2025 |
| Chapet Consultants Limited | Information & communication | 2015 |
| Chapter 77 Limited | Real estate | 2022 |
| Charged by Nature Ltd | Wholesale & retail | 2022 |
| Charles Street Holdings Limited | Extraterritorial | 2004 |
| Charlotte Adams Properties Ltd | Real estate | 2022 |
| Charlotte Mullaly Limited | Administrative & support | 2022 |
| Charlton Hayes Community Management Limited | Households | 2010 |
| Charlton Heights (Filton) Management Company Limited | Households | 2019 |
| Charter Projects (Developments) Limited | Construction | 1982 |
| Charter Projects Management Limited | Arts & recreation | 1994 |
| Chartergrade Limited | Real estate | 1989 |
| Chartfield Homes (Bagshot) Limited | Construction | 2019 |
| Chartfield Homes (Chobham) Limited | Construction | 2019 |
| Chartfield Homes (Ncgc) Limited | Real estate | 2021 |
| Chartfield Homes (Nyasaland) Limited | Construction | 2019 |
| Chartfield Homes Limited | Financial services | 2018 |
| Chase Auto Pension Enrolment Services Limited | Professional & scientific | 2015 |
| Chase Bureau Limited | Professional & scientific | 2001 |
| Chase Family Properties Ltd | Real estate | 2026 |
| CHD Pizza Ltd | Hospitality | 2025 |
| Cheese MAN (Essex) Limited | Wholesale & retail | 2010 |
| Chef Watson Ltd | Hospitality | 2025 |
| Chelmer Road Management Limited | Households | 2006 |
| Cheltenham Road RTM Company Limited | Real estate | 2005 |
| Cherry Fields (Bickington) Management Company Limited | Households | 2021 |
| Cherry House (Worthing) Limited | Hospitality | 2011 |
| Cherrycare Support Services Ltd | Administrative & support | 2017 |
| Chevington Service Limited | Administrative & support | 2005 |
| Chevron Ceramics Ltd | Construction | 2025 |
| Chez Vision Marketing Limited | Professional & scientific | 2012 |
| Chi-Chi Nwanoku Limited | Arts & recreation | 2016 |
| Chiamaka Onuoha Limited | Health & social care | 2021 |
| Chicken EAT Express Ltd | Hospitality | 2025 |
| Chidovk Limited | Health & social care | 2023 |
| Chigwell Homes Ltd | Health & social care | 2005 |
| Chill Bikes Ltd | Wholesale & retail | 2017 |
| Chimney Sweeper Bros Limited | Administrative & support | 2024 |
| Chimpansqueeze Limited | Information & communication | 2025 |
| China Village Limited | Hospitality | 2024 |
| Chinnerys Limited | Hospitality | 2006 |
| Chiron Services Ltd | Health & social care | 2020 |
| Chirpy Chippy Carpentry Limited | Construction | 2015 |
| Chivenor Cross (the Landings) Management Company Limited | Households | 2016 |
| Choice Energy Ltd | Other services | 2020 |
| Choice Insurance Agency Limited | Financial services | 2002 |
| Choices Healthcare Limited | Health & social care | 2012 |
| Chris Bridle Solutions Limited | Information & communication | 2008 |
| Christed Consulting Limited | Professional & scientific | 2021 |
| Chronos Construction Ltd | Wholesale & retail | 2007 |
| CI Voleva Ltd | Hospitality | 2026 |
| Cientos Limited | Hospitality | 2014 |
| Cilia Healthcare Limited | Health & social care | 2015 |
| Cimer Rail Ltd. | Construction | 2016 |
| Cinco Coffee Lounge Limited | Hospitality | 2026 |
| Circlebond Property Management Limited | Households | 1984 |
| Circuitous Consultancy Limited | Professional & scientific | 2026 |
| Circus Design Ltd | Professional & scientific | 2007 |
| Citi Painting & Decorating Limited | Construction | 2017 |
| City Art Limited | Arts & recreation | 2021 |
| City Heroes Club CIC | Education | 2025 |
| City London Properties Ltd | Real estate | 2019 |
| City Pizza MAN Ltd | Hospitality | 2024 |
| City Radio Limited | Information & communication | 2025 |
| Civil Rail Consulting Limited | Professional & scientific | 2014 |
| Civitas Living Hub CIC | Hospitality | 2026 |
| CJ Heath Ltd | Construction | 2022 |
| CJB Transport Ltd | Transport & logistics | 2022 |
| Cjbricks Limited | Wholesale & retail | 2022 |
| CJF Solutions Ltd | Administrative & support | 2016 |
| CJR Restoration Specialists Limited | Wholesale & retail | 2025 |
| CJW Media Ltd | Professional & scientific | 2026 |
| CKK Civil Construction Limited | Construction | 2022 |
| Cladfit UK Ltd | Construction | 2024 |
| Claire Connell Wealth Management Ltd | Other services | 2012 |