| Catem Limited | Information & communication | 2020 |
| Cava Domestic Limited | Construction | 2024 |
| Cava Heating Limited | Construction | 2016 |
| Cavendish Social Investments Limited | Real estate | 2019 |
| Caxton Square Management Company Limited | Real estate | 2024 |
| Cayne Resources Limited | Administrative & support | 2007 |
| Cazalegas Transport Ltd | Real estate | 2015 |
| CB8 Ltd | Professional & scientific | 2001 |
| CDP M & E Limited | Construction | 2018 |
| CDS Property Investments Limited | Real estate | 2025 |
| Cedar Lodge Investments Limited | Real estate | 2022 |
| Cedar Park Day Nursery Limited | Health & social care | 2024 |
| Cedars Nature Centre Ltd | Arts & recreation | 2015 |
| Cefpro Limited | Administrative & support | 2018 |
| Celfix Limited | Extraterritorial | 2021 |
| Cemg Advertising Limited | Administrative & support | 2023 |
| Cemg Marketing Ltd | Administrative & support | 2018 |
| Central Square Management Limited | Households | 1996 |
| Centre for Financial Professionals Ltd | Professional & scientific | 2011 |
| Centrus Management Company Limited | Administrative & support | 2014 |
| Cerromar Solutions Ltd | Construction | 2020 |
| Certus Education Limited | Administrative & support | 2023 |
| CES International Solutions Ltd | Professional & scientific | 2024 |
| CES Telecom Limited | Information & communication | 2003 |
| Cetana Talent Ltd | Professional & scientific | 2024 |
| Cfam Limited | Real estate | 2018 |
| CG Holdco Ltd | Financial services | 2026 |
| Chad Tunley Designs Ltd | Professional & scientific | 2022 |
| Chadney Smith Ltd. | Information & communication | 2017 |
| Chads ARC Ltd | Financial services | 2019 |
| Chalk PIT Cottage Management Company Limited | Real estate | 1985 |
| Chalk Stream Close Management Company Limited | Real estate | 2024 |
| Chalkstone Close Management Company Limited | Households | 1986 |
| Chalkstone Management Limited | Households | 2007 |
| Chamo London Ltd | Manufacturing | 2025 |
| Champion Sports Management Limited | Arts & recreation | 2021 |
| Chappell King Aviation Real Estate Limited | Administrative & support | 2008 |
| Charles Hammon Limited | Professional & scientific | 2025 |
| Charles Lillie Holdings Limited | Wholesale & retail | 2014 |
| Charles Lillie M Limited | Real estate | 2015 |
| Charlotte Court (Oakwood) Management Company Limited | Households | 2023 |
| Charmgain Limited | Real estate | 1990 |
| Charter Auction House Ltd | Real estate | 2023 |
| Charter HCP Limited | Professional & scientific | 2016 |
| Charterhouse Bridging Limited | Financial services | 2015 |
| Charterhouse Corporate Partners Ukraine Limited | Financial services | 2017 |
| Charterhouse Management Limited | Real estate | 2006 |
| Charterhouse Mews (Chelmsford) Management Company Limited | Households | 2015 |
| Charterhouse Technology Limited | Agriculture & fishing | 1993 |
| Chase Automation Ltd | Construction | 2020 |
| Chase Court Gardens Limited | Real estate | 2002 |
| Chateau Gateau Ltd | Hospitality | 2018 |
| Chatsworth Road Loan Company Limited | Administrative & support | 2010 |
| Chaves LLP | | 2024 |
| Checkmyadviser Ltd | Information & communication | 2025 |
| Checkpro Limited | Construction | 2024 |
| Chedd Investments Limited | Real estate | 2014 |
| Chedd Topco Limited | Financial services | 2014 |
| Cheeky COW Ltd | Wholesale & retail | 2018 |
| Chelmer Village (Chelmsford) Management Company Limited | Households | 1986 |
| Cherry Garden Lane Residents Association Ltd | Households | 2012 |
| Cherry Green Barns Residents Limited | Real estate | 2004 |
| Cherrywood Refurbishments Limited | Administrative & support | 2016 |
| Cherubino Properties Ltd | Construction | 2024 |
| Cheviot Court (Management) Limited | Real estate | 1965 |
| CHEVYS1CALL Ltd | Construction | 2013 |
| CHI Surrey Ltd | Transport & logistics | 2009 |
| Chic and Cosy Limited | Wholesale & retail | 2024 |
| Chilton Aurora Investments Limited | Professional & scientific | 2026 |
| CHIME4U Limited | Other services | 2022 |
| Chinton Property Limited | Real estate | 2018 |
| Chipblocks Ltd | Manufacturing | 2025 |
| Choco Lush Limited | Hospitality | 2025 |
| Chris Davis Consultancy Limited | Professional & scientific | 2020 |
| Christopher Anthony Surveyors Ltd | Professional & scientific | 2016 |
| Chronicle Consultancy & Training Limited | Professional & scientific | 2021 |
| Chrono Group Limited | Other services | 2017 |
| Chrono Hunter Limited | Other services | 2022 |
| Church Home Group Resources Limited | Education | 1997 |
| Churchbury Photographic Services Limited | Professional & scientific | 1976 |
| CHW Wealth Management Limited | Financial services | 2023 |
| Cinque Ports Canine Ltd | Other services | 2026 |
| Circle London Management Limited | Other services | 2021 |
| Circle Red Watches Limited | Wholesale & retail | 2024 |
| City & Provincial (Equity Partners) Limited | Real estate | 2000 |
| City and Provincial Securities Limited | Construction | 1996 |
| City Heating and Plumbing Ltd | Construction | 2013 |
| City Paints Limited | Administrative & support | 1995 |
| Cityvend Ltd | Wholesale & retail | 2025 |
| CJD Stays Ltd | Real estate | 2023 |
| CJG Group Limited | Hospitality | 2020 |
| CLA Communications Limited | Professional & scientific | 2023 |
| Clanntara Limited | Financial services | 2025 |
| Clapham Central Freeholders Ltd | Households | 2021 |
| Clarendon Court (Cheshunt) Management Company Limited | Households | 2006 |
| Clarendon House (Harrow View) Management Company Limited | Households | 2004 |
| Clarenta Properties Limited | Real estate | 2022 |
| Clarion Call Consulting and Coaching Limited | Professional & scientific | 2015 |
| Clariss Consulting Limited | Information & communication | 2020 |
| Classic Auto Supplies Ltd | Wholesale & retail | 2011 |