| Cartyzo Limited | Wholesale & retail | 2026 |
| Caruza Limited | Wholesale & retail | 2017 |
| Carziqo Technologies Ltd | Transport & logistics | 2025 |
| Casa Bene Ltd | Wholesale & retail | 2024 |
| Casa Caritas Ltd | Health & social care | 2025 |
| Casa Tea Games Ltd | Information & communication | 2025 |
| Casc Global Ltd | Professional & scientific | 2025 |
| Cascade Intelligence Ltd | Information & communication | 2025 |
| Cascade UK Cleaning Services Ltd | Administrative & support | 2024 |
| Case Based Limited | Information & communication | 2026 |
| Caseeminder Ltd | Wholesale & retail | 2025 |
| Casegrid Ltd | Information & communication | 2026 |
| Cashton Ltd | Wholesale & retail | 2024 |
| Caspian Hospitality Management Ltd | Administrative & support | 2017 |
| Cassidy & Freeman Construction Ltd | Construction | 2024 |
| Casspray Ltd | Construction | 2025 |
| Castle Counselling Centre Ltd | Health & social care | 2024 |
| Castle Green Living Ltd | Real estate | 2023 |
| Castle Rock Software Ltd | Manufacturing | 2021 |
| Castlemore Properties Ltd | Real estate | 2018 |
| Castles Competitions Ltd | Arts & recreation | 2025 |
| Casual Retail Limited | Wholesale & retail | 2024 |
| Cata Yoga Ltd | Information & communication | 2015 |
| Catalyst Byte Ltd | Wholesale & retail | 2025 |
| Catch a Good Feeling C.I.C. | Health & social care | 2024 |
| Catricia Holidays Ltd | Hospitality | 2026 |
| Cautalabs Ltd | Information & communication | 2025 |
| Cavallo Forte Limited | Health & social care | 2024 |
| Cavanagh Consulting Limited | Professional & scientific | 2025 |
| Caventis Ltd | Professional & scientific | 2026 |
| Cavora Capital Ltd | Financial services | 2025 |
| Caydn Ltd | Information & communication | 2023 |
| Cayz Ltd | Manufacturing | 2026 |
| CAZ Group Ltd | Real estate | 2025 |
| Cbaw Solutions Ltd | Information & communication | 2018 |
| CBE Solutions Limited | Construction | 2025 |
| CC Electricity Business Ltd | Extraterritorial | 2025 |
| Cccegroup Ltd | Wholesale & retail | 2026 |
| Ccrea Ltd | Wholesale & retail | 2022 |
| Ccube Ltd | Wholesale & retail | 2026 |
| Cdapparel Ltd | Wholesale & retail | 2025 |
| CDK Global (UK) LP | | 2017 |
| Cdki Holdings (UK) 2 Limited | Financial services | 2020 |
| CDM Global Ltd | Wholesale & retail | 2026 |
| CDR Digital Ltd | Information & communication | 2014 |
| CE Haulage Ltd | Transport & logistics | 2024 |
| Cece Studios Ltd | Information & communication | 2026 |
| Cecil Walter Ltd | Administrative & support | 2015 |
| Cedarpoint Ltd | Education | 2025 |
| Cedrus Crown Stars Ltd | Education | 2023 |
| Cedrus Libani LLP | | 2022 |
| Celebi Trade Ltd | Wholesale & retail | 2025 |
| Celestial South Ltd | Professional & scientific | 2025 |
| Cell Lock Limited | Wholesale & retail | 2024 |
| CELL4D Ltd | Professional & scientific | 2021 |
| Celtfest Limited | Arts & recreation | 2008 |
| Cementra Ltd | Manufacturing | 2025 |
| Cenit Estates Ltd | Hospitality | 2023 |
| Cenova Ltd | Professional & scientific | 2025 |
| Centaurus Ventures Ltd | Real estate | 2024 |
| Central England Animal SAR UK CIC | Agriculture & fishing | 2024 |
| Centriohost Limited | Information & communication | 2022 |
| Century Roofing Ltd | Construction | 2023 |
| Ceramicpaw Limited | Wholesale & retail | 2026 |
| Cerulean Bytes Limited | Information & communication | 2025 |
| Cets Management Ltd | Administrative & support | 2024 |
| Ceylon Food Wheels Ltd | Hospitality | 2025 |
| Cf-Max Limited | Wholesale & retail | 2024 |
| CF37 SPV1 Ltd | Real estate | 2025 |
| CG Rental Properties Ltd | Real estate | 2023 |
| CH Estate Group Ltd. | Real estate | 2025 |
| CH Group Anglia Ltd | Wholesale & retail | 2025 |
| Chain Hire Connect Ltd | Administrative & support | 2025 |
| Chainfork Digital Ltd | Information & communication | 2025 |
| Chance Trading Ltd | Wholesale & retail | 2022 |
| Chancy Pants Ltd | Information & communication | 2025 |
| Chandi &3R Ltd | Wholesale & retail | 2025 |
| Chandler Solutions Limited | Construction | 2023 |
| Change Chantry Community Interest Company | Other services | 2025 |
| Change Management Associates Ltd. | Other services | 2005 |
| Chapel Security Consults and Estates UK Limited | Financial services | 2022 |
| Chapter & Tide Ltd | Real estate | 2025 |
| Chapter Thirty Two Ltd | Information & communication | 2022 |
| Chaptersbooks Ltd | Wholesale & retail | 2024 |
| Character Cookies Ltd | Manufacturing | 2024 |
| Charged-Up Electrical Services Ltd | Construction | 2024 |
| Chargentum Group Limited | Wholesale & retail | 2025 |
| Charnwood Scientific Ltd | Professional & scientific | 2024 |
| Chase Estimating Ltd | Construction | 2020 |
| Chase Group of Companies Limited | Financial services | 2020 |
| Chase Projects & Design Ltd | Construction | 2022 |
| Chatlogic Insights Ltd | Information & communication | 2024 |
| Cheers&Deals Ltd | Wholesale & retail | 2025 |
| Cheikh Ecom Ltd | Wholesale & retail | 2024 |
| Chelmsford Dental Aesthetics Ltd | Health & social care | 2025 |
| Chemical Cartel Limited | Wholesale & retail | 2023 |
| Chemical Management LLP | | 2005 |
| Chermill Ltd | Households | 2022 |
| Cherry Beach Swimwear Ltd | Wholesale & retail | 2025 |
| Cherry Global Ltd | Wholesale & retail | 2025 |