| Carrickmore Limited | Administrative & support | 2011 |
| Carrigans Consultancy Ltd | Professional & scientific | 2025 |
| Carrington Engineering Limited | Professional & scientific | 2015 |
| Carroll-Turner Piano Services Ltd | Manufacturing | 2003 |
| Casa Cat Limited | Real estate | 2024 |
| Casa DE Cura Ltd | Health & social care | 2024 |
| Casa DE SAN Limited | Real estate | 2018 |
| Casa Hove Limited | Wholesale & retail | 2021 |
| Casablanca (UK) Limited | Information & communication | 2009 |
| Casagrande Coaching Academy CIC | Education | 2025 |
| Caseium Ltd | Wholesale & retail | 2018 |
| Casgo Connections Limited | Administrative & support | 2013 |
| Caskade Pubs Ltd | Hospitality | 2025 |
| Caspar Dien Limited | Professional & scientific | 2009 |
| Cassillis Law Limited | Professional & scientific | 2024 |
| Castle Quarter Limited | Real estate | 2022 |
| Castor Group Ltd | Information & communication | 2025 |
| Catalyst Media Ltd | Professional & scientific | 2021 |
| Cathysmedics Limited | Health & social care | 2023 |
| Catlow Property Management Ltd | Real estate | 2019 |
| Catskills Music Publishing Ltd | Administrative & support | 1999 |
| Catskills Records Limited | Arts & recreation | 1999 |
| Catt and SON Limited | Construction | 2019 |
| CAV Films Limited | Manufacturing | 2001 |
| Cavalaire Town Limited | Real estate | 2025 |
| Cavalcade Productions Limited | Information & communication | 2019 |
| Caversham Health Club Limited | Other services | 2015 |
| Caviar Empire Limited | Hospitality | 2025 |
| Cayuga 001 Ltd | Administrative & support | 2016 |
| Cayuga 004 LLP | | 2017 |
| Cayuga 005 Limited | Real estate | 2017 |
| Cayuga 007 Ltd | Construction | 2018 |
| Cayuga 011 Ltd | Construction | 2020 |
| Cayuga 013 LLP | | 2021 |
| Cayuga 014 LLP | | 2021 |
| Cayuga 015 LLP | | 2022 |
| Cayuga 017 LLP | | 2023 |
| Cayuga 018 LLP | | 2024 |
| Cayuga 019 LLP | | 2024 |
| Cayuga 020 LLP | | 2024 |
| Cayuga 21 Ltd | Construction | 2025 |
| Cayuga Developments Limited | Other services | 2017 |
| Cayuga Investments 2 Limited | Construction | 2021 |
| Cayuga Investments 3 Ltd | Construction | 2022 |
| CBS Isfield Ltd | Professional & scientific | 1996 |
| CC Foundations Ltd | Real estate | 2009 |
| Cctv Services (Brighton) Ltd | Wholesale & retail | 2016 |
| Cctv Wifi Aerials Technicians Ltd | Construction | 2022 |
| CDA Joinery & Building Services Limited | Construction | 2014 |
| CE Baker Ltd | Information & communication | 2025 |
| Ceci Holdings Ltd | Financial services | 2025 |
| Cedar Pathways Ltd | Health & social care | 2026 |
| Celly's FB Ltd | Other services | 2026 |
| Celly's Sutton Ltd | Other services | 2026 |
| Celtic Maritime Limited | Professional & scientific | 2024 |
| Celticook Modern Essentials Limited | Wholesale & retail | 2024 |
| Central Hove Property Maintenance Ltd | Construction | 2023 |
| Centre for Finance Excellence Ltd | Professional & scientific | 2021 |
| Centre for Team Excellence Limited | Other services | 1999 |
| Ceramic Designs Laboratory LLP | | 2013 |
| Certus Commercial Limited | Administrative & support | 2010 |
| Ceruleean Limited | Professional & scientific | 2025 |
| Cetd Consulting Ltd | Professional & scientific | 2018 |
| CGM FBA Ltd | Wholesale & retail | 2024 |
| Chaconia Ventures Limited | Hospitality | 2025 |
| Chalcraft Bros (Funeral Directors) Limited | Other services | 1988 |
| Chalk Path Projects Limited | Information & communication | 2019 |
| Chalkline Projects Ltd | Construction | 2025 |
| Chambers UK 2021 Ltd | Real estate | 2021 |
| Chambler Consulting Ltd | Administrative & support | 2013 |
| Chamonix Accommodation Ltd | Administrative & support | 2009 |
| Champions ROW Management Company Limited | Households | 1999 |
| Change Innovation Ltd | Professional & scientific | 2024 |
| Change Your Estate Ltd | Real estate | 2021 |
| Channel House Management Limited | Extraterritorial | 2013 |
| Channel Hughes Ltd | Information & communication | 2021 |
| Chapala Blues Ltd | Hospitality | 2018 |
| Chapel Dental Laboratory Limited | Manufacturing | 2020 |
| Chapel Mews Freeholders Limited | Households | 1996 |
| Chapel Townhouse Limited | Hospitality | 2023 |
| Chapman and Stacey Limited | Financial services | 1963 |
| Chariot Global Trading Limited | Wholesale & retail | 2013 |
| Charisma Italy Limited | Other services | 2006 |
| Charles Frodsham & Co Limited | Manufacturing | 1893 |
| Charles James BPM Ltd | Administrative & support | 2017 |
| Charles Linton Carpentry and Construction Ltd | Construction | 2016 |
| Charleston Finance Ltd | Real estate | 2010 |
| Charleston Trustees Ltd | Real estate | 2010 |
| Charm Investments Limited | Real estate | 2005 |
| Charmaine Fuller Limited | Other services | 2014 |
| Chartaero Ltd | Transport & logistics | 2024 |
| Chartercross Properties Limited | Real estate | 2005 |
| Charterhouse Fabrics Limited | Extraterritorial | 1996 |
| Chartsworth Maintenance Limited | Administrative & support | 2007 |
| Chartwell Learning & Development Limited | Administrative & support | 1977 |
| Chase IT Solutions Limited | Information & communication | 2008 |
| Chaseborder Property Management Limited | Households | 2007 |
| Chasing Rabbits Limited | Hospitality | 2022 |
| Chater Dental Limited | Health & social care | 2026 |
| Chatsworth Court (Shoreham) Management Company Limited | Households | 1979 |