| Cayman Estate Limited | Real estate | 2023 |
| CB (Oldco) Limited | Administrative & support | 2000 |
| CB Harrington Ltd | Information & communication | 2015 |
| Cbaseholdings Ltd | Construction | 2025 |
| CBH Electrical Ltd | Construction | 2021 |
| Cbhc (Audit) Limited | Professional & scientific | 2023 |
| Cbhc Accounting Services LLP | | 2008 |
| Cbhc Audit Services Limited | Professional & scientific | 2018 |
| Cbhc DM Holdings Limited | Financial services | 2024 |
| Cbhc Financial Holdings Limited | Administrative & support | 2004 |
| Cbhc Limited | Professional & scientific | 2014 |
| Cbhc Pscs Holdings Limited | Financial services | 2023 |
| Cbhc Trustees Limited | Financial services | 2009 |
| CBM Planning Limited | Transport & logistics | 2019 |
| CBT Works Ltd | Health & social care | 2012 |
| CBW Treeworkers Ltd | Other services | 2025 |
| CC Logistics Holdings Limited | Financial services | 2025 |
| CC TAN Accountancy Services Limited | Professional & scientific | 2022 |
| CC2 Contractors Ltd | Construction | 2025 |
| Ccav Ltd | Manufacturing | 2024 |
| Cccl Trading Limited | Wholesale & retail | 2010 |
| Cchs Capital Development Limited | Other services | 1994 |
| CCM Utilities Ltd | Construction | 2007 |
| Cctv Aware Limited | Information & communication | 2016 |
| CD Academy Limited | Education | 2024 |
| CD Glennon Ltd | Information & communication | 2023 |
| CDP Osteopaths Ltd | Professional & scientific | 2021 |
| Cdyne Limited | Professional & scientific | 2019 |
| CE Management Limited | Professional & scientific | 2022 |
| Cebolit Ltd | Information & communication | 2015 |
| Cebreiro Property's Ltd | Real estate | 2023 |
| Cecilia's Design Limited | Manufacturing | 2017 |
| Cedar Avenue West Flats Limited | Real estate | 2014 |
| Cedar Cars Redhill Limited | Transport & logistics | 2016 |
| Cedar Home Store Limited | Wholesale & retail | 2022 |
| Cedar Leather Ltd | Wholesale & retail | 2023 |
| Ceed Marketing Ltd | Information & communication | 2019 |
| Ceed Print Ltd | Manufacturing | 2021 |
| Celebrated Affairs Limited | Hospitality | 2004 |
| Celeste EYE Wear Ltd | Wholesale & retail | 2026 |
| Celestine Social Care & Family Support Services Limited | Health & social care | 2022 |
| Cellar Classics Limited | Extraterritorial | 2014 |
| Cellar Twelve Limited | Wholesale & retail | 2004 |
| Celuna Sleep Company Limited | Wholesale & retail | 2024 |
| CEM Bookkeeping & Accounting Limited | Professional & scientific | 2015 |
| CEM Bookkeeping Limited | Professional & scientific | 2021 |
| Centaurea Vision Ltd | Health & social care | 2020 |
| Center for Advanced Studies in Strategy (Cass) Educational Group Limited | Professional & scientific | 2005 |
| Central Digital Print Limited | Manufacturing | 2004 |
| Central Essex Storage Solutions Limited | Administrative & support | 2019 |
| Central Law Group CIC | Professional & scientific | 2018 |
| Central Paws Ltd | Other services | 2025 |
| Central Services (Essex) Ltd | Professional & scientific | 2008 |
| Centre for Window and Cladding Technology | Construction | 2021 |
| Centre Point Cars Limited | Wholesale & retail | 2017 |
| Centre Reach (Coleman Street) Management Company Limited | Households | 1989 |
| Centurion Plumbing Ltd | Construction | 2006 |
| Centurion Property Holdings Ltd | Real estate | 2016 |
| Century 21 Services Limited | Administrative & support | 2004 |
| Century Underwriting Limited | Financial services | 2011 |
| Cenultra Limited | Construction | 2012 |
| Cenultra Properties Limited | Real estate | 2015 |
| Cepersonal Ltd | Arts & recreation | 2021 |
| Ceres Consulting and Trade Limited | Professional & scientific | 2023 |
| Ceres Valuations LLP | | 2021 |
| Ceri Investment Properties Ltd | Real estate | 2023 |
| Certa Global Trading Solutions Limited | Professional & scientific | 2016 |
| Certech Associates Limited | Professional & scientific | 2013 |
| Certech Limited | Professional & scientific | 2026 |
| Certified Drain Services Limited | Water & waste | 2015 |
| Certified Drone Services Limited | Other services | 2025 |
| CES Consulting Limited | Professional & scientific | 2007 |
| CFH 11 Limited | Real estate | 2021 |
| CFJ Engineering Ltd | Construction | 2019 |
| CFT Accountancy Ltd | Professional & scientific | 2025 |
| CGA Cleaning Ltd | Administrative & support | 2018 |
| CGA Invest Ltd | Real estate | 2023 |
| CGF Sprinkler Designs Limited | Construction | 2008 |
| CGO Plumbing and Electrical Limited | Construction | 2016 |
| CGS Developments Limited | Real estate | 2025 |
| CH & F Limited | Professional & scientific | 2019 |
| CH Tradesmen Ltd | Construction | 2015 |
| CHA CHA Club Ltd | Financial services | 2026 |
| Chaimee Holdings Ltd | Wholesale & retail | 2024 |
| Chaimee Installations Ltd | Construction | 2025 |
| Chalkley Easterbee Limited | Professional & scientific | 2013 |
| Challenger Solutions Aerospace & Defence Limited | Professional & scientific | 2021 |
| Challenger Solutions Eco Limited | Professional & scientific | 2010 |
| Challenger Solutions Holdings Limited | Professional & scientific | 2014 |
| Chamerew Limited | Administrative & support | 2002 |
| Chancellor Management Limited | Administrative & support | 2003 |
| Chancellor Recruitment Limited | Administrative & support | 2021 |
| Chandigarh Group Ltd | Construction | 2025 |
| Chandler Motorsport Ltd | Arts & recreation | 2024 |
| Chandler Norton Developments Limited | Real estate | 2022 |
| Chandrasekhar Consultancy Limited | Information & communication | 2015 |
| Change Advisors Limited | Professional & scientific | 2013 |
| Change Harbour Ltd | Information & communication | 2011 |
| Changexpert Ltd | Professional & scientific | 2024 |
| Channel Logix Limited | Information & communication | 2015 |