| Caseiras Ltd | Hospitality | 2020 |
| Casina House Limited | Real estate | 2026 |
| Casmithies Ltd | Wholesale & retail | 2019 |
| Casperg Group Co., Ltd | Manufacturing | 2024 |
| Casperg Paper Industrial Co., Ltd | Wholesale & retail | 2019 |
| Castletown Construction & Maintenance Limited | Construction | 2009 |
| Catalina & Associates Ltd | Extraterritorial | 2020 |
| Catalina Beauty Group Limited | Manufacturing | 2024 |
| Catbells Change Management Ltd | Professional & scientific | 2020 |
| Catford and Lewisham Lets Limited | Real estate | 2013 |
| Catford Mews Ltd | Construction | 2016 |
| Cathy Industrial & Trade Co., Ltd | Extraterritorial | 2021 |
| Caver Marine Service Ltd | Manufacturing | 2023 |
| Cawdor Design Ltd | Professional & scientific | 2020 |
| Caywood Property Limited | Professional & scientific | 2007 |
| CB Promotions Limited | Arts & recreation | 2015 |
| CB Scenic Services Ltd | Manufacturing | 2020 |
| Cb&I Consultancy Limited | Professional & scientific | 2026 |
| Ccamm Property Management Limited | Real estate | 2019 |
| CCF International Ltd | Extraterritorial | 2023 |
| CCK Accountancy Services Limited | Professional & scientific | 2009 |
| CCL Machinery Co., Ltd | Extraterritorial | 2014 |
| CCN Auto Parts Co., Ltd. | Professional & scientific | 2020 |
| CCN Industry Co., Ltd. | Extraterritorial | 2022 |
| Ccuswarm. Ltd | Wholesale & retail | 2021 |
| CDM Titan International Co., Ltd | Manufacturing | 2009 |
| CDR Solutions Limited | Extraterritorial | 2007 |
| Cebu Ltd | Real estate | 2025 |
| CEC Science and Innovation Co., Ltd | Extraterritorial | 2008 |
| Cedar Clinic Development Limited | Financial services | 2025 |
| Cedar Lawn Management Limited | Households | 1987 |
| Celebrity Merchandise Limited | Wholesale & retail | 2013 |
| Celeste Apparel Ltd | Wholesale & retail | 2026 |
| Cell Medical Instruments Limited | Extraterritorial | 2017 |
| Cement Glaze Decorators Limited | Construction | 1993 |
| Centenary Court Management Company Limited | Households | 1997 |
| Centre Tech Co., Limited | Manufacturing | 2023 |
| Centrepunch Ltd. | Education | 2011 |
| Century China Shipping Marine Service Co., Limited | Extraterritorial | 2016 |
| Century Exhibition Group (UK) Ltd | Extraterritorial | 2014 |
| Century Gate (Beckenham) Management Company Limited | Households | 2025 |
| Century Kunpeng Co., Ltd. | Wholesale & retail | 2024 |
| Century Solution Corporation Ltd | Extraterritorial | 2023 |
| Centyear Trade Limited | Professional & scientific | 2014 |
| Ceri Jerseys Ltd | Wholesale & retail | 2024 |
| Cernoch Energy Ltd | Administrative & support | 2013 |
| Certain Harvest Limited | Wholesale & retail | 2020 |
| Certivantage Alliance Ltd | Manufacturing | 2025 |
| Cerulink Solutions Limited | Wholesale & retail | 2025 |
| CES Propco Ltd | Financial services | 2020 |
| CGS Communications London Ltd | Professional & scientific | 2023 |
| CH Group Industry Co., Ltd | Extraterritorial | 2018 |
| Chacha B London Limited | Other services | 2025 |
| Chai & Chaat Limited | Hospitality | 2023 |
| Chairbears Day Nursery Limited | Education | 2013 |
| Chairbears Hunton Ltd | Education | 2023 |
| Chalet 1802 Limited | Administrative & support | 2003 |
| Chami Umbrella Manufacturing Co., Ltd | Extraterritorial | 2016 |
| Champion Productions Limited | Arts & recreation | 2019 |
| Chance Further Support CIC | Administrative & support | 2017 |
| Chance Industrial & Trading Co., Limited | Extraterritorial | 2019 |
| Chance Supported Housing Ltd | Hospitality | 2018 |
| Chang XIN Shipping Limited | Manufacturing | 2023 |
| Changchen Import and Export Co., Ltd | Wholesale & retail | 2024 |
| Changsheng Clothing Ltd | Manufacturing | 2023 |
| Changyi Trading Limited | Wholesale & retail | 2025 |
| Changyou Limited | Wholesale & retail | 2024 |
| Changyunda Metal Products Co., Limited | Manufacturing | 2023 |
| Changzhou Kangmei Chemical Industry Co., Ltd | Manufacturing | 2025 |
| Changzhou KYA Trading Co., Ltd | Extraterritorial | 2015 |
| Changzhou Refychem Co., Ltd | Extraterritorial | 2009 |
| Changzhou Top Real Supply Import Export Co., Ltd. | Extraterritorial | 2020 |
| Chansit Shums Limited | Water & waste | 2014 |
| Chantelle Hederman Therapies Ltd | Health & social care | 2017 |
| Chao Shan Hometech Limited | Extraterritorial | 2026 |
| Chaoki Trading Ltd. | Extraterritorial | 2025 |
| Charis Care and Support Limited | Health & social care | 2015 |
| Charisma Gymnastics Club Limited | Arts & recreation | 2012 |
| Charismatic Flat Management Limited | Administrative & support | 1991 |
| Charles Palace Limited | Administrative & support | 2017 |
| Charlie Henderman Limited | Manufacturing | 2021 |
| Charlotte Edwards Bathrooms Limited | Wholesale & retail | 2013 |
| Charly Limited | Households | 2013 |
| Charobel Investments Limited | Financial services | 2024 |
| Charter Oakmont Developments Ltd | Construction | 2022 |
| Chartwell Lodge Residents Association Limited | Real estate | 1999 |
| Cheam Limousines Limited | Administrative & support | 2003 |
| Chells Lashes & Aesthetics Ltd | Other services | 2022 |
| Chelong Company Ltd | Extraterritorial | 2009 |
| Chemact Petrolchemical International Limited | Professional & scientific | 2006 |
| Chemistry Insight Limited | Professional & scientific | 2018 |
| Chemlink Technology (UK) Co., Limited | Extraterritorial | 2009 |
| Chen Chem Limited | Manufacturing | 2024 |
| Chenfei Tech Co., Ltd | Extraterritorial | 2024 |
| Chengxin Jewelry Arts&Crafts Co., Limited | Manufacturing | 2023 |
| Chengxin Ruyi International Trade Limited | Wholesale & retail | 2023 |
| Chenjun International Group Ltd | Extraterritorial | 2016 |
| Chenwei International (UK) Group Limited | Extraterritorial | 2014 |
| Chenyee Industries Co., Ltd | Professional & scientific | 2014 |
| Chenyi Venutti Co Ltd | Extraterritorial | 2021 |