| Burrell Medical Co., Ltd | Extraterritorial | 2015 |
| Burrlands Management Company Limited | Households | 1986 |
| Bushin International Logistics Co., Ltd | Manufacturing | 2014 |
| Business Bosses Limited | Information & communication | 2023 |
| Business Footprint Limited | Professional & scientific | 2007 |
| Bustle Technology Ltd | Extraterritorial | 2020 |
| Butterfly Effect Projects Ltd | Administrative & support | 2014 |
| Butterflykeebs Limited | Wholesale & retail | 2025 |
| Buyashara Limited | Professional & scientific | 2016 |
| Buyrock Limited | Wholesale & retail | 2025 |
| BWY Technology Co., Ltd | Wholesale & retail | 2020 |
| BY Dovedale Limited | Health & social care | 2025 |
| Byerley Limited | Professional & scientific | 2011 |
| Bylon Sealing Material Co., Ltd | Professional & scientific | 2020 |
| C & R Lift Services Ltd | Administrative & support | 2008 |
| C Bennett Ltd | Information & communication | 2015 |
| C Bros Building Services Ltd | Construction | 2010 |
| C Bros Holdings Limited | Financial services | 2017 |
| C P Franks Consultancy Limited | Information & communication | 2011 |
| C&C Arts and Crafts Ltd | Extraterritorial | 2015 |
| C&D Proprietary (PTY) Co., Limited | Wholesale & retail | 2025 |
| C&N Building (UK) Ltd | Construction | 2019 |
| C&W Apparel Co., Ltd | Extraterritorial | 2013 |
| C.H. (Group) Trading Ltd | Extraterritorial | 2021 |
| C.J. Haworth (International) Limited | Other services | 1993 |
| C.M.J Limited | Professional & scientific | 2022 |
| C.Y. Sweet Home Co., Ltd | Wholesale & retail | 2023 |
| C3M Studio Ltd | Professional & scientific | 2013 |
| C77HEALTH Limited | Information & communication | 2018 |
| C7COMPUTERS Limited | Information & communication | 2010 |
| Caffe Guglielmo UK Ltd | Wholesale & retail | 2005 |
| Cagp Limited | Financial services | 2019 |
| Caino International Limited | Extraterritorial | 2015 |
| Caitlin and Leah Limited | Other services | 2021 |
| CAJ Investments Limited | Real estate | 2010 |
| Cakar Colour Limited | Other services | 2024 |
| Calaban Technologies Limited | Manufacturing | 2025 |
| Calcarry Tech Co., Ltd. | Wholesale & retail | 2023 |
| Caldera Coffees Ltd | Wholesale & retail | 2024 |
| Caliane Ltd | Hospitality | 2016 |
| Calico Developments Limited | Real estate | 1991 |
| California Orange Co., Ltd. | Extraterritorial | 2016 |
| Caliora Beauty & Cosmetic Co., Ltd | Wholesale & retail | 2025 |
| Calle DE Toros Limited | Administrative & support | 2004 |
| Callous Industrial & Trade Co., Ltd | Extraterritorial | 2018 |
| Calm Sea International Marine Service Co., Ltd | Wholesale & retail | 2024 |
| Calroo Ltd | Professional & scientific | 2021 |
| Calxeda International Trade Limited | Extraterritorial | 2022 |
| Camber Coast Holidays Ltd | Hospitality | 2019 |
| Cambridge Cradle Education Group Co., Ltd | Extraterritorial | 2018 |
| Cambridge Laboratory Beauty Ltd | Wholesale & retail | 2022 |
| Camel Auto Spare Parts Manufacture Co., Limited | Extraterritorial | 2019 |
| Camel Global Supply Ltd | Extraterritorial | 2018 |
| Cameo Event Hire Limited | Other services | 1992 |
| Camg Trans Ltd | Transport & logistics | 2021 |
| Campanaro Holdings & Investments Limited | Financial services | 2024 |
| Campanaro Investments Limited | Financial services | 2023 |
| Campbell's Optimum - Healthcare Limited | Health & social care | 2023 |
| Campert Technology Co Limited | Wholesale & retail | 2025 |
| Campus Australia Study Abroad Limited | Education | 2024 |
| Camtop Oilfield Service Ltd | Extraterritorial | 2015 |
| Camélie P Ltd | Professional & scientific | 2021 |
| Canada Beilemu Mining Group (UK) Co., Limited | Extraterritorial | 2018 |
| Canada Bioco Co., Ltd | Mining & quarrying | 2024 |
| Canada Manhelian Chemical Industry Share Ltd | Extraterritorial | 2024 |
| Canada Westpoint Fertilizer Co., Ltd | Extraterritorial | 2020 |
| Candor Construction & Maintenance Limited | Construction | 2016 |
| Candor Construction Developments Ltd | Real estate | 2019 |
| Cangnan Hana Commodity Ltd | Extraterritorial | 2015 |
| Cangzhou Tianyu Feed Additive Co., Ltd | Extraterritorial | 2016 |
| Cangzhou Yongkang Medical Devices Co., Ltd | Wholesale & retail | 2019 |
| Cannon Car Hire Limited | Administrative & support | 2015 |
| Cannon Interiors Limited | Construction | 2013 |
| Cannonbray Limited | | 1988 |
| Capacity Properties Limited | Households | 2023 |
| Capel Walk (Penge) Management Company Limited | Households | 1985 |
| Capital Cleaning & Support Services Limited | Administrative & support | 2001 |
| Capital King Investments Limited | Real estate | 2011 |
| Capital TEC Co., Ltd | Extraterritorial | 2016 |
| Capricorn Marine Service Co., Limited | Manufacturing | 2025 |
| Capture Revenue Ltd | Information & communication | 2026 |
| Car Direct Limited | Wholesale & retail | 2024 |
| Cardiler Manufacturing Ltd. | Manufacturing | 2022 |
| Care at My Home Ltd | Health & social care | 2023 |
| Careerology Limited | Education | 2025 |
| Carefully International Trading Ltd. | Extraterritorial | 2018 |
| Carentes Holding Group Limited | Extraterritorial | 2020 |
| Carlroth Company Limited | Extraterritorial | 2018 |
| Carlwich Bearing Co., Ltd | Extraterritorial | 2023 |
| Carrickeast Construction Limited | Construction | 2010 |
| Carroll Howard Ltd | Education | 2019 |
| Carryoncalm Ltd | Health & social care | 2023 |
| Cars by Cascoe Ltd | Manufacturing | 2025 |
| Cartel Bakes Ltd | Manufacturing | 2025 |
| Carter-Middleton Holdings Limited | Financial services | 2024 |
| Carter-Middleton Limited | Financial services | 1995 |
| Carvoy Ltd | Transport & logistics | 2024 |
| Carvoy Pro Ltd | Wholesale & retail | 2024 |
| CARZOO24 Trading Limited | Wholesale & retail | 2025 |
| Casa SEI Ltd | Wholesale & retail | 2017 |