| Colaso Technology Co., Ltd | Extraterritorial | 2018 |
| Colibri Trader Limited | Administrative & support | 2017 |
| Collage LDN Ltd | Professional & scientific | 2018 |
| College Road Services Limited | Extraterritorial | 2020 |
| Coloba Management Services Limited | Professional & scientific | 2011 |
| Colorswoo Group Limited | Extraterritorial | 2020 |
| Combi Shipbroking Ltd | Wholesale & retail | 2015 |
| Comercio Mundial Conectado International Co., Ltd | Wholesale & retail | 2018 |
| Comfort Life Home Appliances Co., Limited | Energy | 2014 |
| Comhar Consulting and Services Ltd. | Information & communication | 2016 |
| Commercial Energy Solutions Ltd | Professional & scientific | 2007 |
| Commonwealth Trading Solutions Ltd | Wholesale & retail | 2022 |
| Competition Today Ltd | Information & communication | 2025 |
| Complete Kitchen Installations Surrey Ltd | Construction | 2023 |
| Compliance R US Ltd | Professional & scientific | 2022 |
| Compliance Solutions 247 Ltd | Transport & logistics | 2019 |
| Complyte Ltd | Professional & scientific | 2024 |
| Compra China Facil Ltd | Wholesale & retail | 2022 |
| Comshill Limited | Real estate | 2015 |
| Concept Space Industrial Limited | Extraterritorial | 2017 |
| Confidence Through Assured Security Solutions Limited | Administrative & support | 2011 |
| Coniston House Limited | Households | 2002 |
| Conjoin-Win Group Co., Ltd | Wholesale & retail | 2020 |
| Connaught House Properties Limited | Real estate | 2015 |
| Connect 3 Consulting Ltd | Professional & scientific | 2015 |
| Consoleone Limited | Information & communication | 2005 |
| Construct and Build (Staffs) Limited | Construction | 2026 |
| Construction London Limited | Construction | 2014 |
| Consult Hughes Limited | Real estate | 2022 |
| Content Cover Limited | Manufacturing | 2023 |
| Contin Co., Ltd | Extraterritorial | 2014 |
| Continental Marine and Offshore Services Co., Ltd | Manufacturing | 2022 |
| Contrast Cold Plunge and Saunas Ltd | Other services | 2024 |
| Convey Sun Limited | Wholesale & retail | 2022 |
| Cook Studio Ltd | Wholesale & retail | 2024 |
| Cooker Capital Co., Ltd | Information & communication | 2022 |
| Cool Stone Limited | Real estate | 2023 |
| Cooling Post Ltd | Information & communication | 2018 |
| Coombe Property and Investments Limited | Real estate | 2017 |
| Coop Trade Co Ltd | Extraterritorial | 2022 |
| Copeland Investco Ltd | Real estate | 2026 |
| Copower Industrial Co., Ltd | Wholesale & retail | 2022 |
| Copperfields Residents Association Limited | Households | 1980 |
| Coprime Consultancy Ltd | Information & communication | 2016 |
| Coral House Ltd | Information & communication | 2026 |
| Coral Projects Limited | Other services | 2023 |
| Core Protection Technology Ltd | Administrative & support | 2023 |
| CORE3NG Ltd | Construction | 2025 |
| Coremind Innovations Ltd | Information & communication | 2025 |
| Coretek Technology Company Limited | Extraterritorial | 2019 |
| Corinne Court Limited | Households | 2012 |
| Corinne Court Management Limited | Households | 2026 |
| Cornerstone Drainage Ltd | Construction | 2026 |
| Cornerstone Solutions Limited | Professional & scientific | 2014 |
| Corrine Marine Co., Ltd | Manufacturing | 2024 |
| Corth Ltd | Health & social care | 2019 |
| Corylus Estates Limited | Real estate | 2022 |
| Cosmos Global International Limited | Professional & scientific | 2023 |
| Cosmos International Trade Co., Ltd | Wholesale & retail | 2012 |
| Costadoro Beckenham Ltd | Hospitality | 2025 |
| Costpro Limited | Professional & scientific | 2023 |
| Cosy Cat Plumbing & Heating Ltd | Construction | 2021 |
| Cotslab Limited | Extraterritorial | 2021 |
| Cottle & Co Consultancy Ltd | Professional & scientific | 2025 |
| Counselling Enterprise Ltd | Education | 2008 |
| Country Garden Services Limited | Administrative & support | 2018 |
| Courland (Eastbourne) Limited | Households | 2006 |
| Coventry Motor Parts Limited | Wholesale & retail | 2005 |
| Covert Security Solutions Limited | Public administration | 2004 |
| Covtteca Industrial Technology Co., Ltd | Extraterritorial | 2021 |
| Cowaq Scientific Corp Limited | Extraterritorial | 2015 |
| Cowin Co., Limited | Extraterritorial | 2014 |
| Cowin Enterprise Limited | Manufacturing | 2014 |
| Coyare Trade Limited | Wholesale & retail | 2023 |
| CPS Associates Limited | Professional & scientific | 2012 |
| CQ Xiyi Technology Co., Ltd | Extraterritorial | 2019 |
| CR Corporation Limited | Extraterritorial | 2021 |
| Crackon-It Ltd | Information & communication | 2019 |
| Craft Lighting Limited | Information & communication | 2015 |
| Cray VS. Cray Ltd | Information & communication | 2013 |
| Crazy EDU Ltd | Wholesale & retail | 2024 |
| Crcbond Fine Chemicals Co., Ltd. | Professional & scientific | 2015 |
| CRD Creative Ltd | Professional & scientific | 2021 |
| CRE8 Interiors Limited | Extraterritorial | 2002 |
| Creases Beckenham Ltd | Other services | 2020 |
| Createch Co., Ltd | Manufacturing | 2015 |
| Createpose Limited | Administrative & support | 2013 |
| Creation Abundant Limited | Wholesale & retail | 2024 |
| Creative Arts Social (CAS) Consultancy Limited | Administrative & support | 2021 |
| Creative Decorating London Ltd | Other services | 2021 |
| Creative SC Holdings Limited | Financial services | 2023 |
| Creative Skills Consortium Ltd | Other services | 2018 |
| Creative Suite Ltd | Professional & scientific | 2020 |
| Creative Technologies Hongkong Ltd | Wholesale & retail | 2024 |
| Creative Technology LAB Ltd | Information & communication | 2020 |
| Creed Shine Electric Tech Co., Ltd | Extraterritorial | 2014 |
| Creekside Developments Limited | Extraterritorial | 2004 |
| Crescent Corner Ltd | Real estate | 2024 |
| Crestar Industrial Co., Ltd. | Wholesale & retail | 2024 |
| Cricket Lane Allotments Limited | Agriculture & fishing | 2019 |