| Caukie Community Interest Company | Other services | 2024 |
| Cawl (UK) Technologies Limited | Wholesale & retail | 2019 |
| Caxton Consultancy Services Ltd | Professional & scientific | 2018 |
| Caxton Hall Limited | Households | 2009 |
| Cayho Estates LLP | | 2009 |
| Cazonomics Ltd | Information & communication | 2025 |
| CB Exploration Ltd | Professional & scientific | 2015 |
| CB Inn Limited | Hospitality | 2004 |
| CB Social Marketing Limited | Professional & scientific | 2019 |
| Cbcb Aesthetics Ltd | Health & social care | 2021 |
| Cbee (Europe) Limited | Wholesale & retail | 2007 |
| CCT2 Limited | Manufacturing | 2016 |
| Cctvfirst Limited | Administrative & support | 2019 |
| Cedar One Ltd | Information & communication | 2012 |
| Ceetek Limited | Construction | 2000 |
| Cekic Holding Limited | Financial services | 2021 |
| Cekic Property (Printworks) Limited | Real estate | 2026 |
| Celemin Studio Ltd | Wholesale & retail | 2012 |
| Celerity Systems Europe Limited | Wholesale & retail | 2015 |
| Celerity Systems Limited | Financial services | 2010 |
| Celerity Systems N.A. Limited | Professional & scientific | 2014 |
| Celestial Squid Media Ltd | Information & communication | 2021 |
| Cellar Door Architecture Ltd | Professional & scientific | 2020 |
| Centorius (UK) Limited | Extraterritorial | 2010 |
| Central CMS Ltd | Health & social care | 2025 |
| Central Contract Fixing Limited | Construction | 1998 |
| Central Point Properties Ltd | Real estate | 2008 |
| Central Thirsk Development Company Ltd | Administrative & support | 2018 |
| Centre for Sports Injury Surgery Limited | Health & social care | 2009 |
| Century Tyres Ltd | Wholesale & retail | 2025 |
| Ceproso - Circular Economy Procurement Solutions Ltd | Professional & scientific | 2020 |
| Ceraudo Architecture Ltd | Professional & scientific | 2024 |
| Cerebral Products Limited | Real estate | 2012 |
| Ceren & Naturell Doner Ltd | Wholesale & retail | 2026 |
| Cert Recruitment Limited | Administrative & support | 2017 |
| Certified Graphics Ltd | Professional & scientific | 2012 |
| CES Design Ltd | Professional & scientific | 2021 |
| Chadbury Communications Limited | Professional & scientific | 2001 |
| Chadha & SON Limited | Wholesale & retail | 2024 |
| Chalk+Change Ltd | Administrative & support | 2021 |
| Challenge MET Limited | Professional & scientific | 2021 |
| Challis Builders Limited | Construction | 2007 |
| Chambertech Consulting Ltd | Manufacturing | 2024 |
| Chambertech Limited | Manufacturing | 2022 |
| Chandler Properties Limited | Real estate | 2015 |
| Change Catalysts Limited | Administrative & support | 2008 |
| Chapelseat Comms Ltd | Professional & scientific | 2012 |
| Chaps & Crew Ltd | Other services | 2024 |
| Charcot Capital (UK) LLP | | 2008 |
| Charisse & Co. Virtual Assistance Ltd | Other services | 2021 |
| Charlie Auto Repair Limited | Wholesale & retail | 2025 |
| Charlotte Gogstad Ltd | Professional & scientific | 2022 |
| Charlotte Photi Bookkeeping Limited | Professional & scientific | 2012 |
| Charmon Limited | Professional & scientific | 1960 |
| Charwood Real Estate Ltd | Real estate | 2023 |
| Chas Safety Services Limited | Professional & scientific | 2022 |
| Chas. Long & SON (Aggregates) Limited | Wholesale & retail | 2003 |
| Chaytor Farm Development Management Company Limited | Extraterritorial | 2001 |
| Chconserve Limited | Administrative & support | 2014 |
| Check'D Invest Limited | Administrative & support | 2021 |
| Chedserve Limited | Administrative & support | 2014 |
| Chef Hong Kong (Richmond) Limited | Hospitality | 2005 |
| Chelsea Green Napier Limited | Real estate | 2025 |
| Chelsea Green Shipping Limited | Other services | 2020 |
| Chelsea Prime Holdings Ltd | Real estate | 2020 |
| Cheltway Investments (Holdings) Limited | Real estate | 2007 |
| Cheltway Investments Limited | Real estate | 1945 |
| Chequers Inn at Dalton on Tees Ltd | Hospitality | 2026 |
| Chess River Limited | Real estate | 2003 |
| Chevening Management Limited | Real estate | 2012 |
| Cheyham Lodge Osteopaths Limited | Health & social care | 2003 |
| Chiappe Financial Editing & Writing Ltd | Information & communication | 2010 |
| Chilcott Limited | Professional & scientific | 1985 |
| Chilled Bros Ltd. | Professional & scientific | 2009 |
| Chillisauce Limited | Administrative & support | 2000 |
| Chillx Digital Ltd | Information & communication | 2024 |
| China Pharma Ltd | Manufacturing | 2013 |
| China Soulution Ltd | Professional & scientific | 2024 |
| Chinaturally Ltd | Health & social care | 2017 |
| Chip and Potato Production 2 Limited | Information & communication | 2019 |
| Chiswick Place Consultancy Ltd | Administrative & support | 2017 |
| Chiswick Rowing Trust | Arts & recreation | 2016 |
| Chiswick RT Services Limited | Other services | 2025 |
| Chiswick Tennis Club Limited | Arts & recreation | 1984 |
| Chit Chaat Chai 1 Limited | Hospitality | 2025 |
| Chivalry Road Management Limited | Administrative & support | 1983 |
| Chocolate Doctors Limited | Manufacturing | 2018 |
| CHR Investment Solutions Limited | Financial services | 2024 |
| Chris & Chris Motors Ltd | Wholesale & retail | 2002 |
| Chris Cornwell Production Services Limited | Other services | 2015 |
| Christian Fellowship in Richmond | Health & social care | 1998 |
| Christine-Verity & Co Ltd | Hospitality | 2024 |
| Chromium Holdings Limited | Administrative & support | 2017 |
| Chrysostom Limited | Arts & recreation | 2024 |
| Church Terrace Building Supplies Limited | Wholesale & retail | 2015 |
| Churchdale Court Freehold Limited | Households | 2021 |
| Cielo BLU Ltd | Professional & scientific | 2012 |
| Cier Ventures Ltd | Information & communication | 2026 |
| CII International Limited | Extraterritorial | 2018 |
| Cimoro Limited | Manufacturing | 2014 |