| Chevans Ltd | Construction | 2014 |
| Chez Resources UK Limited | Professional & scientific | 2016 |
| Chi-Squared Properties Limited | Households | 2022 |
| Chieldeng Limited | Health & social care | 2021 |
| Children's Joy Limited | Health & social care | 2014 |
| Chilead Limited | Real estate | 2024 |
| China Red DA8 Ltd | Hospitality | 2022 |
| Chinell Kids Limited | Health & social care | 2025 |
| Chinoncreates Ltd | Wholesale & retail | 2026 |
| Chirag Spares Ltd | Wholesale & retail | 2025 |
| Chock Design UK Limited | Extraterritorial | 2013 |
| Chris IKP Construction Limited | Construction | 2015 |
| Chrisadiele Consults Ltd | Professional & scientific | 2024 |
| Christ Faith Global Evangelism Ltd | Other services | 2023 |
| Christ Light Assemblies | Other services | 2008 |
| Christwintin Limited | Health & social care | 2022 |
| Chua Professional Marketing Services Ltd | Professional & scientific | 2023 |
| Chuangjin Ltd | Hospitality | 2024 |
| Church Walk (Beachamwell) Management Company Limited | Real estate | 2001 |
| Ciao Deli Limited | Hospitality | 2022 |
| Cino Auto Tech Ltd | Wholesale & retail | 2026 |
| Cipher Advisory Ltd | Professional & scientific | 2026 |
| Cipims Limited | Construction | 2017 |
| Citi Development Corp Ltd | Real estate | 2014 |
| Citipost Direct Distribution Limited | Extraterritorial | 2004 |
| Citipost Holdings Limited | Financial services | 2016 |
| Citipost Limited | Other services | 1997 |
| Citipost Mail Limited | Extraterritorial | 1999 |
| City Batteries Ltd | Water & waste | 2018 |
| City West Entertainment Ltd | Arts & recreation | 2025 |
| Civium Ltd | Professional & scientific | 2025 |
| CJ Nicholas Care Ltd | Administrative & support | 2024 |
| Cjaan Services Ltd | Health & social care | 2020 |
| Ckxtras Ltd | Wholesale & retail | 2020 |
| Clabay Ltd | Manufacturing | 2023 |
| Clachar Plastering Ltd | Construction | 2025 |
| Claire Horne Creative Ltd | Professional & scientific | 2018 |
| Claristo Ltd | Information & communication | 2026 |
| Clarkes Travel Limited | Administrative & support | 1974 |
| Classic Key Ltd | Real estate | 2025 |
| Classicsecure Ltd | Professional & scientific | 2014 |
| Clean Hearted 24S Ltd | Manufacturing | 2024 |
| Clean Lines Agency Limited | Information & communication | 2025 |
| Clean Wright Services Ltd | Administrative & support | 2022 |
| Cleanwear Services Limited | Administrative & support | 2009 |
| Clevertouch Technologies Limited | Wholesale & retail | 2021 |
| Clicksreach Ltd | Information & communication | 2021 |
| Client Centred Care Limited | Health & social care | 2016 |
| Cliftonway Ltd | Real estate | 2023 |
| Climacare Commissioning Holdings Limited | Financial services | 2023 |
| Climacare Commissioning Limited | Professional & scientific | 2010 |
| Clive Taylor Solutions Ltd | Other services | 2023 |
| Clothes Lijana Ltd | Wholesale & retail | 2024 |
| Cloud Logics Limited | Information & communication | 2020 |
| CMS Scaffolding Limited | Construction | 2022 |
| CMW Partners Ltd | Real estate | 2020 |
| CMW Restorations Ltd | Real estate | 2025 |
| Code Easy Limited | Information & communication | 2024 |
| COE Visuals Ltd | Information & communication | 2026 |
| Coffee Goat Kitchen Ltd | Manufacturing | 2026 |
| Coffeecosandesh Limited | Wholesale & retail | 2025 |
| Cogna Global Ltd | Information & communication | 2025 |
| Colann Services Limited | Hospitality | 2014 |
| Collision Care Limited | Wholesale & retail | 2022 |
| Combined Attire Ltd | Wholesale & retail | 2020 |
| Comfortlife Properties Limited | Real estate | 2023 |
| Commercial Seating Company Limited | Manufacturing | 2009 |
| Commodore Holdings Ltd | Financial services | 2021 |
| Compagnie Inéluctable Ltd | Professional & scientific | 2026 |
| Conehill Ltd | Financial services | 2017 |
| Confluence Mart Ltd | Wholesale & retail | 2020 |
| Constancy Business Intelligence Ltd | Administrative & support | 2016 |
| Cooldownpoint Limited | Wholesale & retail | 2026 |
| Coorporate Rooms Limited | Hospitality | 2016 |
| Corabia Ltd | Construction | 2022 |
| Cordium Facilities Limited | Real estate | 2023 |
| Coreline Metalworks Limited | Manufacturing | 2025 |
| Cornerstone Path Ltd | Real estate | 2025 |
| Cornerstone Social Care Services Ltd | Health & social care | 2021 |
| Corporate Business Concept Limited | Financial services | 2013 |
| Cottonify Ltd | Wholesale & retail | 2024 |
| Covenant Apostolic Ministries International | Other services | 2024 |
| CPC Personal Care Limited | Health & social care | 2016 |
| CQ Solutions Ltd | Administrative & support | 2019 |
| Craft Distributors UK Limited | Wholesale & retail | 2008 |
| Cranleigh Environmental Limited | Water & waste | 2008 |
| Cranleigh Landfill Limited | Administrative & support | 2009 |
| Cray Export Ltd | Administrative & support | 2023 |
| Crazy Monkey Limited | Wholesale & retail | 2025 |
| Cream Erith Ltd | Other services | 2014 |
| Creative Service Limited | Professional & scientific | 2006 |
| Creative Spaces Joinery Ltd | Manufacturing | 2016 |
| Crescent Commercial Supplies Limited | Other services | 2003 |
| Crescent Industrial Flooring Limited | Construction | 2019 |
| Crestmont Oak Capital Limited | Professional & scientific | 2025 |
| Crims Care Limited | Education | 2021 |
| Criolla Cakes Ltd | Manufacturing | 2020 |
| Cronin Utilities Limited | Construction | 2024 |
| Cronus Collective Ltd | Hospitality | 2023 |
| Cross Channel Enterprises Limited | Transport & logistics | 1998 |