| Carter Group Limited | Manufacturing | 2017 |
| Carter Security Limited | Manufacturing | 2010 |
| Carter Services Group Limited | Administrative & support | 2018 |
| Carter, Hunt and Bradbury Limited | Information & communication | 2013 |
| Carvel Recruitment Ltd | Administrative & support | 2021 |
| Carverhaggard Limited | Professional & scientific | 2010 |
| Case International Limited | Manufacturing | 2000 |
| Casper International Limited | Wholesale & retail | 2015 |
| Cass Motor Services Ltd | Wholesale & retail | 2025 |
| Caste Services Limited | Professional & scientific | 2026 |
| Castle Leisure Camps Limited | Arts & recreation | 1991 |
| Castle View Communications Ltd | Construction | 2020 |
| Castlegate Property (U.K) Limited | Construction | 2021 |
| Catalin Tudor Limited | Transport & logistics | 2021 |
| Catamount Scaffolding Ltd | Construction | 2021 |
| Catana Quality Work Ltd | Construction | 2023 |
| Cater-Moore Ltd | Manufacturing | 2025 |
| Catering Equipment Shop Limited | Wholesale & retail | 2025 |
| Catherine Cowling Limited | Arts & recreation | 2008 |
| Catmompop Ltd | Arts & recreation | 2024 |
| Cattle Yard Closet Limited | Wholesale & retail | 2024 |
| Cavi Drylining Ltd | Construction | 2018 |
| Cavi Fire Ltd | Construction | 2024 |
| Cawston Development Ltd | Professional & scientific | 2025 |
| CB Creative Design Ltd | Administrative & support | 2003 |
| CB Gifts Limited | Wholesale & retail | 2014 |
| CB Virtual Assistant Ltd | Administrative & support | 2022 |
| CBE Building Group Ltd | Construction | 2023 |
| CC Tax Solutions Ltd | Professional & scientific | 2024 |
| Ccbm Group Ltd | Construction | 2026 |
| Ccbm Limited | Construction | 2014 |
| CCR Precision Limited | Construction | 2007 |
| CCR Property Services Ltd | Construction | 2011 |
| Ccrf Telecoms Ltd | Information & communication | 2025 |
| CCS Automotive Limited | Other services | 2024 |
| CCS Recovery Ltd | Wholesale & retail | 2022 |
| Cctv Security UK Limited | Administrative & support | 2020 |
| CCW Building and Plumbing Ltd | Construction | 2026 |
| CD Plastering (UK) Limited | Construction | 2014 |
| CD Tunnelling Ltd | Construction | 2023 |
| CDN Scaffolding Limited | Construction | 2024 |
| CDS Trading UK Limited | Real estate | 2003 |
| CDT Facilities Ltd | Construction | 2025 |
| Ceaunul CU Sarmale Ltd | Hospitality | 2025 |
| Cedar-Il Limited | Information & communication | 2016 |
| Cedar-Il Property Investments Ltd | Real estate | 2019 |
| Cedro Studios Ltd | Professional & scientific | 2026 |
| Ceek Global Technologies Ltd | Information & communication | 2020 |
| Celebrate Circus Ltd | Arts & recreation | 2020 |
| Celebrate Gymnastics Club Ltd | Arts & recreation | 2019 |
| Celebrity Masterclass Limited | Education | 2025 |
| Celestial Church of Christ Promise of GOD Essex Parish | Other services | 2016 |
| Central Hairdressing Training Centre Limited | Other services | 1983 |
| Central Training Academy Limited | Education | 1992 |
| Centre Carpets Limited | Wholesale & retail | 2015 |
| Cenvar Ltd | Information & communication | 2025 |
| Cercel Alex Limited | Transport & logistics | 2020 |
| Cerebral Medical Limited | Health & social care | 2019 |
| Cers Family Ltd | Construction | 2025 |
| CET Academy Ltd | Information & communication | 2023 |
| Cevikay Limited | Wholesale & retail | 2025 |
| CF PUB Co Ltd | Hospitality | 2026 |
| CFD Landscaping Ltd | Administrative & support | 2020 |
| CGS Wealth Limited | Professional & scientific | 2021 |
| CH Land Consultancy Limited | Real estate | 2022 |
| Chaleka Healthcare Limited | Other services | 2021 |
| Chalkwell Hall Properties Limited | Real estate | 1972 |
| Chameleon Strategies Limited | Professional & scientific | 2009 |
| Chameleons Tattoo Parlour Limited | Other services | 2023 |
| Chammosair Limited | Financial services | 2024 |
| Champ Nexus Ltd | Information & communication | 2025 |
| Champagne Carping Ltd | Agriculture & fishing | 2026 |
| Champion Services Group Limited | Administrative & support | 2022 |
| Chanax Limited | Real estate | 2023 |
| Chancel Close 1966 Limited | Extraterritorial | 2014 |
| Change Chiropractic Ltd | Health & social care | 2024 |
| Change Life Care Ltd | Health & social care | 2023 |
| Changenet Solutions Limited | Professional & scientific | 2019 |
| Changing Pathways | Hospitality | 2016 |
| Channels (Phase 4) Management Company Limited | Professional & scientific | 2019 |
| Chant Surveys Ltd | Professional & scientific | 2024 |
| Charge Investments Limited | Real estate | 2025 |
| Charis Care Group Ltd | Health & social care | 2021 |
| Charles B COX Ltd | Financial services | 2022 |
| Charles Carlisle Construction Limited | Construction | 2015 |
| Charles Longman Limited | Professional & scientific | 2023 |
| Charles Owney Ltd | Construction | 2025 |
| Charlesville Construction Limited | Construction | 2022 |
| Charli's Beauty Company Limited | Other services | 2017 |
| Charlotte Sweeney Real Estate Limited | Real estate | 2025 |
| Charlotte Wakefield Tattoo Ltd | Arts & recreation | 2023 |
| Charman Consultants Limited | Professional & scientific | 2019 |
| Charman Investments Ltd | Financial services | 2023 |
| Charman Tax Advisors Ltd | Professional & scientific | 2025 |
| Chartenaire Ltd | Administrative & support | 2025 |
| Chartwell Business Parks Management Ltd | Real estate | 2015 |
| Chase Heptons Limited | Financial services | 2021 |
| Chasers Club Ltd | Information & communication | 2026 |
| Chateau Maison Ltd | Real estate | 2019 |
| Chateau Mirador Limited | Hospitality | 2022 |