| Churchfields (Cheshire) Holdings Limited | Financial services | 2016 |
| Churchfields (Cheshire) Limited | Administrative & support | 2011 |
| Churchfields Spring Company Limited | Professional & scientific | 1946 |
| Churchgate Bolton (NO.1) Limited | Professional & scientific | 2016 |
| Churchgate Bolton (NO.2) Limited | Professional & scientific | 2016 |
| Churchgate Commercial Holdings Limited | Real estate | 2019 |
| Churchgate Day Nursery Limited | Extraterritorial | 2019 |
| Churchgate Investments (U.K.) Limited | Construction | 1998 |
| Churchill Driveways Limited | Construction | 2019 |
| Churchill Gardens (Westhoughton) Management Company Limited | Households | 2005 |
| Churchill Motley Limited | Financial services | 2018 |
| Churros L Manchester Limited | Hospitality | 2024 |
| Chutch Holdings Limited | Professional & scientific | 2021 |
| Chutney Blue Ltd | Hospitality | 2018 |
| Chutney Masala Limited | Hospitality | 2025 |
| Chuxiga Uhii Limited | Wholesale & retail | 2026 |
| Chuxin Technology Ltd | Information & communication | 2021 |
| Chvt Limited | Other services | 2019 |
| Chwei Eing Limited Limited | Wholesale & retail | 2026 |
| CHY Morvah Limited | Health & social care | 2006 |
| Chypower Home Appliances Repairs Ltd | Transport & logistics | 2023 |
| CIA Installation Ltd | Construction | 2021 |
| Ciao Cleaning Services Limited | Administrative & support | 2025 |
| Ciaoco Ltd | Extraterritorial | 2023 |
| Ciaooo Holding Ltd | Hospitality | 2022 |
| Ciaooo Pizzeria Ltd | Hospitality | 2018 |
| Ciaracon Productions Ltd | Information & communication | 2012 |
| Cias Limited | Information & communication | 1990 |
| Cibeles Consulting Ltd | Information & communication | 2013 |
| Cibo Express Manchester Ltd | Hospitality | 2026 |
| Cibus Manchester Limited | Wholesale & retail | 2016 |
| Cicchetti Piccadilly Ltd | Hospitality | 2023 |
| Cicero Investments Limited | Wholesale & retail | 2024 |
| Cicp Ltd | Other services | 2019 |
| Cicuu Ltd | Information & communication | 2018 |
| Cielo Couriers Limited | Transport & logistics | 2016 |
| Cielo Forwarding Limited | Professional & scientific | 2025 |
| Cielo MCR Ltd | Hospitality | 2022 |
| Cielo Suites Ltd | Real estate | 2025 |
| Cienna Foods Ltd | Hospitality | 2025 |
| CIF Logistics Ltd | Transport & logistics | 2015 |
| CIG MON Group Limited | Transport & logistics | 1991 |
| Cignus Games Ltd | Information & communication | 2022 |
| Cigtronica Limited | Wholesale & retail | 2012 |
| CIK Ltd | Administrative & support | 2020 |
| Ciliary Blue Limited | Health & social care | 2011 |
| Cilla Knitwear Ltd | Manufacturing | 2018 |
| Cillian & Rose Bespoke Furniture Ltd | Manufacturing | 2025 |
| Cilvian Ltd | Information & communication | 2024 |
| Cima Foods Ltd. | Hospitality | 2021 |
| Cime Nove Ltd | Administrative & support | 2021 |
| Cims Networks Limited | Information & communication | 2016 |
| CIN Holdings Ltd | Financial services | 2026 |
| Cinarancia UK Bidco Limited | Financial services | 2023 |
| Cinchona Technologies Ltd | Wholesale & retail | 2020 |
| Cincom Systems (UK) Limited | Information & communication | 1982 |
| Cincom Systems Trustee (UK) Limited | Financial services | 2014 |
| Cindamagchem Group Co., Ltd | Manufacturing | 2023 |
| Cinder House Publishing Limited | Information & communication | 2016 |
| Cinder Infosecurity Ltd | Information & communication | 2026 |
| Cinderella Lighting Ltd | Manufacturing | 2020 |
| Cinderella's Limited | Wholesale & retail | 2018 |
| Cindy and Kids Ltd | Real estate | 2019 |
| Cinemateca Limited | Information & communication | 2025 |
| Cineops Ltd | Professional & scientific | 2018 |
| Cinetique Limited | Information & communication | 2003 |
| Cinis Group Ltd | Professional & scientific | 2026 |
| Cinmar Properties Ltd | Real estate | 2025 |
| Cinnamon (Cheshire) Ltd | Hospitality | 2014 |
| Cinnamon at the Bridge Limited | Hospitality | 2018 |
| Cinnamon Lounge Bar Limited | Hospitality | 2018 |
| Cinnamon Mill Limited | Hospitality | 2016 |
| Cinns Limited | Professional & scientific | 2007 |
| Cintamani Valbonne Limited | Wholesale & retail | 2024 |
| Cintra Associates Limited | Professional & scientific | 2003 |
| Cintro Limited | Professional & scientific | 2025 |
| Cinway Ltd | Wholesale & retail | 2024 |
| Ciocan Builders Limited | Construction | 2024 |
| CIP Worthing Ltd | Administrative & support | 2025 |
| Cipher 13 Ltd | Professional & scientific | 2025 |
| Cipher Atlas Productions Ltd | Manufacturing | 2024 |
| Cipher Vault Ltd | Information & communication | 2025 |
| Cipherbloom Investment Partners Ltd | Extraterritorial | 2025 |
| Cipheredge Investment Solutions Ltd | Extraterritorial | 2025 |
| Ciphernest Capital Ltd | Extraterritorial | 2025 |
| Cipherquest Investment Services Ltd | Extraterritorial | 2025 |
| Ciphersphere Ltd | Information & communication | 2024 |
| Ciqaqcservices Limited | Professional & scientific | 2025 |
| Circkit.Ai Ltd | Information & communication | 2016 |
| Circle AAA Co Ltd | Construction | 2025 |
| Circle Arch Ltd | Other services | 2024 |
| Circle Court SPV 2 Limited | Real estate | 2025 |
| Circle Dental Care Limited | Health & social care | 2009 |
| Circle Express Limited | Transport & logistics | 1988 |
| Circle Square 1 Limited | Hospitality | 2021 |
| Circle Square Green Company Limited | Construction | 2017 |
| Circle Sustainability Ltd | Professional & scientific | 2023 |
| Circle Systems Limited | Financial services | 2023 |
| Circle White Group Limited | Professional & scientific | 2023 |
| Circleloop Limited | Information & communication | 2017 |