| Christy Construction Ltd | Construction | 2026 |
| Christy Interiors Limited | Wholesale & retail | 2003 |
| Christy Stitchline Limited | Wholesale & retail | 2016 |
| Chromatic Media Ltd | Information & communication | 2024 |
| Chrome Cleaning Ltd | Administrative & support | 2024 |
| Chrome Innovation Limited | Health & social care | 2015 |
| Chromed Studios Ltd | Other services | 2026 |
| Chromisma Limited | Information & communication | 2019 |
| Chronic Insanity Ltd | Manufacturing | 2015 |
| Chronically ILL Artists Network CIC | Arts & recreation | 2025 |
| Chroniq App Ltd | Information & communication | 2025 |
| Chrono Glyph Interactive Limited | Information & communication | 2016 |
| Chrys-A-Lee Music Limited | Information & communication | 1967 |
| Chrysalids Consulting Ltd | Administrative & support | 2014 |
| Chrysalis (Holdings) UK Ltd | Financial services | 2014 |
| Chrysalis Health & Beauty Business Solutions Ltd | Manufacturing | 2007 |
| Chrysalis Health Beauty Business Solutions Limited | Manufacturing | 2026 |
| Chrz Limited | Hospitality | 2024 |
| Chubby PUB Company Ltd | Hospitality | 2019 |
| Chukka Cove Limited | Wholesale & retail | 2009 |
| Chum & Co. Property Ltd | Households | 2025 |
| Chung's SM Limited | Financial services | 2023 |
| Chung's VS Limited | Financial services | 2023 |
| Chungs of Mapperley Limited | Hospitality | 1993 |
| Church Farm at Rusticus Limited | Health & social care | 2017 |
| Church Farm Estates Management Company Ltd | Households | 2022 |
| Church Farm Nursing Home Limited | Health & social care | 2005 |
| Church Hill Autoworx Ltd | Wholesale & retail | 2015 |
| Church House Properties Ltd | Real estate | 1989 |
| Church Lane (Epperstone) Management Company Limited | Households | 2018 |
| Church Lukas Holdings (JF) Limited | Administrative & support | 2016 |
| Church Lukas Holdings (SC) Limited | Administrative & support | 2016 |
| Church Lukas Limited | Real estate | 1996 |
| Church of the Cosmic Skull Ltd | Wholesale & retail | 2017 |
| Church RD Saltash SPV Ltd | Real estate | 2020 |
| Church Street Bureau Ltd | Information & communication | 2022 |
| Church Street Developments Ltd | Construction | 2016 |
| Church View Ingoldmells Ltd | Hospitality | 2022 |
| Churchfield Notts Ltd | Wholesale & retail | 2024 |
| Churchill Lightning Protection Limited | Extraterritorial | 2003 |
| Churchill Specialist Contracting Limited | Construction | 1994 |
| Churchill Steeplejacks (U.K.) Limited | Extraterritorial | 2010 |
| Churchills Consulting Limited | Professional & scientific | 2000 |
| Churchinford Ltd | Administrative & support | 2022 |
| Churchsuite Limited | Information & communication | 2013 |
| CHV Limited | Construction | 2015 |
| CIA Project Services Ltd | Professional & scientific | 2023 |
| CIA Sofian Limited | Health & social care | 2021 |
| Ciaran Cakes Ltd | Wholesale & retail | 2026 |
| Cici Medical Ltd | Health & social care | 2021 |
| Cie-Group Holdings Limited | Financial services | 2022 |
| Cie-Group Limited | Wholesale & retail | 1992 |
| Ciel Developments Limited | Real estate | 2022 |
| Cientiam Trading Limited | Administrative & support | 2016 |
| Cigar Nights Limited | Wholesale & retail | 2022 |
| Ciiru Limited | Health & social care | 2016 |
| Cillah Health Care Limited | Health & social care | 2020 |
| CIM Interiors Limited | Construction | 2012 |
| Cimbom Ltd | Hospitality | 2023 |
| Cina Barber Ltd | Other services | 2022 |
| Cinar 98 Ltd | Construction | 2025 |
| Cinderella Cleaning Contractors Limited | Administrative & support | 1999 |
| Cinderhill Gym Limited | Arts & recreation | 2002 |
| Cinderhill Pharmacy Limited | Wholesale & retail | 2020 |
| Cinechi Ltd | Wholesale & retail | 2019 |
| Cinematic Concepts Limited | Information & communication | 2025 |
| Cinevision Studio Limited | Information & communication | 2025 |
| Cinisvadum Investments Ltd | Real estate | 2021 |
| Cinnabar Circus Ltd | Information & communication | 2025 |
| Cinnabar Investments Ltd | Wholesale & retail | 2015 |
| Cinorg Limited | Real estate | 2016 |
| CIP Marketing Limited | Professional & scientific | 2000 |
| Cipher Consulting Ltd | Professional & scientific | 2023 |
| Cipms Ltd | Professional & scientific | 2023 |
| Cipp Systems Limited | Water & waste | 2001 |
| Cipres International Ltd | Wholesale & retail | 2022 |
| Ciprian Extra Clean Ltd | Construction | 2025 |
| Cir-Comm Systems Limited | Other services | 1989 |
| Circ Electrical Services Ltd | Construction | 2025 |
| Circle Europe Ltd | Water & waste | 2021 |
| Circle of Power Academy Ltd | Professional & scientific | 2019 |
| Circle Project Management Ltd | Professional & scientific | 2016 |
| Circle Records Limited | Arts & recreation | 1998 |
| Circle Software & Design Ltd | Information & communication | 2021 |
| Circled Phones Ltd | Wholesale & retail | 2025 |
| Circleway Ltd | Real estate | 2024 |
| Circuit 78 Holdings Limited | Financial services | 2025 |
| Circuit 78 Investments Limited | Financial services | 2026 |
| Circuit 78 Marketing Limited | Professional & scientific | 2021 |
| Circuit Bureau Limited | Administrative & support | 2006 |
| Circular Agriculture Hub Limited | Administrative & support | 2025 |
| Circular Resource Planning Consulting Limited | Professional & scientific | 2023 |
| Circular Resource Planning Limited | Information & communication | 2022 |
| Circular Resource Planning Services Limited | Professional & scientific | 2023 |
| Circus Hub CIC | Arts & recreation | 2022 |
| Cirj Services Limited | Wholesale & retail | 2013 |
| Cirmg Developments Limited | Construction | 2026 |
| Ciro Barreto Limited | Health & social care | 2018 |
| Cirrus Music Limited | Arts & recreation | 2004 |
| Citadel Air Defense Group Ltd | Public administration | 2026 |