| Centurion Industrial Packaging Limited | Administrative & support | 2003 |
| Century Housing Project Limited | Hospitality | 2011 |
| Cenu Ltd | Manufacturing | 2019 |
| CF Armstrong & SON Ltd | Construction | 2025 |
| CGB HR Consulting Limited | Professional & scientific | 2014 |
| CGC Powder Coating Limited | Manufacturing | 2020 |
| CGD Publishing Limited | Information & communication | 2024 |
| CH Racing Limited | Arts & recreation | 2006 |
| Chaggar Medical Consultancy Ltd | Health & social care | 2019 |
| Chaggar Property Services Ltd | Construction | 2025 |
| Chairwell Seating Limited | Manufacturing | 2016 |
| Chalk Refrigeration Drainage Ltd | Professional & scientific | 2019 |
| Chalkhill Wildlife & Countryside Services Ltd | Administrative & support | 2019 |
| Chambers and Practitioners Ltd | Health & social care | 2019 |
| Chambers Lettings Ltd | Real estate | 2018 |
| Chameleon in Colour Ltd | Wholesale & retail | 2025 |
| Championing Change Ltd | Construction | 2017 |
| Change Resourcing and Consultancy Services Limited | Professional & scientific | 2019 |
| Chaos Hockey Ltd | Manufacturing | 2026 |
| Chapel Grange Residents Association Limited | Professional & scientific | 2006 |
| Chapel Street Rugby Limited | Real estate | 2016 |
| Charan Ltd | Real estate | 2026 |
| Charity Administration, Resourcing & Accountability | Hospitality | 1997 |
| Charles ASH Limited | Professional & scientific | 2025 |
| Charlie's Angels Care Limited | Health & social care | 2025 |
| Charlies Pearl LLP | | 2017 |
| Charmcrafters Ltd | Manufacturing | 2023 |
| Chartered Accountants' Benevolent Association | Health & social care | 2006 |
| Chartop Ltd | Other services | 2017 |
| Chasers Daventry Limited | Hospitality | 2013 |
| Chaudharydesigns Ltd | Professional & scientific | 2025 |
| Chemken Consultancy Ltd | Professional & scientific | 2010 |
| Chencao Ltd | Wholesale & retail | 2025 |
| CHERAS520 Limited | Hospitality | 2025 |
| Cherrytree Technology Limited | Information & communication | 2024 |
| Chester Houston Limited | Construction | 2010 |
| Chester Houston Property Services Limited | Real estate | 2020 |
| Chestham Capital Limited | Professional & scientific | 2023 |
| Chestnut Field Trading Limited | Manufacturing | 2025 |
| Chicco DI Cafe Ltd | Hospitality | 2026 |
| Chicco Ltd | Hospitality | 2024 |
| Chichester Road Portsmouth Ltd | Real estate | 2023 |
| Chico Trans Ltd | Transport & logistics | 2019 |
| Chief Acceleration Officers Ltd | Administrative & support | 2024 |
| Chiesa Estates Limited | Construction | 2020 |
| Chilton Bancroft Consultancy Limited | Administrative & support | 2014 |
| Chiropractic Wellness Incorporated Limited | Health & social care | 2008 |
| Chirvasa Transport Ltd | Transport & logistics | 2019 |
| Chiswick Kitchen Limited | Hospitality | 2024 |
| Chitra Property Ltd | Real estate | 2023 |
| Choco Bliss Ltd | Hospitality | 2026 |
| Chong Diagnostics Limited | Health & social care | 2023 |
| Choysia Limited | Financial services | 2020 |
| Chris & Mady Spedition Limited | Transport & logistics | 2018 |
| Chris Auto Ltd | Wholesale & retail | 2019 |
| Chris Boehm Limited | Transport & logistics | 2009 |
| Chris Harris Photography Ltd | Information & communication | 2020 |
| Chris Wakelin Ltd | Arts & recreation | 2023 |
| Chrisfys Properties Limited | Construction | 2004 |
| Christabel Cooper Investments (Maidenhead) Limited | Real estate | 1964 |
| Christopher Price Consulting Limited | Transport & logistics | 2024 |
| Chryso Limited | Wholesale & retail | 2001 |
| Chuangyi Limited | Information & communication | 2016 |
| Chudy Property Renovations Ltd | Construction | 2024 |
| Chukwufumnanya Maha Ltd | Health & social care | 2018 |
| Church Street Mini Mart Ltd | Wholesale & retail | 2026 |
| Churchill Medical (Systems) Ltd | Health & social care | 2020 |
| Churchill Medical Limited | Wholesale & retail | 1993 |
| Churchside Property Management Limited | Real estate | 2013 |
| CIA Insurance Services Limited | Financial services | 2001 |
| CIN Construction Ltd | Construction | 2019 |
| Ciorcas Ltd | Transport & logistics | 2022 |
| Ciptrans Transport Limited | Transport & logistics | 2020 |
| Circles Consulting Limited | Information & communication | 2016 |
| Circles Network | Health & social care | 1994 |
| Cismasu Top Cleaning Ltd | Administrative & support | 2025 |
| Citadel Consulting Limited | Professional & scientific | 2015 |
| Citely Limited | Information & communication | 2026 |
| Citisnagging Ltd | Construction | 2020 |
| Citius Resources Limited | Financial services | 2025 |
| City Car RM Ltd | Wholesale & retail | 2023 |
| City Plastering (Midlands) Limited | Construction | 2018 |
| CIV 26 UK Ltd | Transport & logistics | 2016 |
| Civil Film Limited | Information & communication | 2023 |
| CJB Remedies Ltd | Manufacturing | 2025 |
| CJC Stringer Ltd | Professional & scientific | 2022 |
| CJG at Height Ltd | Manufacturing | 2024 |
| Cjmobilecaravanservices Ltd | Transport & logistics | 2014 |
| CK Deliveries Ltd | Transport & logistics | 2023 |
| CK Executive Services UK Limited | Administrative & support | 2024 |
| CKC Innovations Limited | Other services | 2011 |
| Ckhji Kibk LHJ Ltd | Wholesale & retail | 2025 |
| Claddex Ltd | Manufacturing | 1995 |
| Claire Judd Ltd | Health & social care | 2019 |
| Claire Russell Consulting Limited | Other services | 2021 |
| Clamora Ltd | Transport & logistics | 2025 |
| Claremont Consultancy Services Ltd. | Information & communication | 2017 |
| Clarence & Clarence Limited | Real estate | 2021 |
| Clarence Ardley Developments Limited | Real estate | 2022 |
| Clarence Ardley Limited | Real estate | 2020 |