| CAD Detailers UK Ltd | Professional & scientific | 2024 |
| Cadquest Solutions Limited | Information & communication | 2026 |
| Cadram Limited | Extraterritorial | 2015 |
| Caliber Transport Ltd | Transport & logistics | 2017 |
| Calldene Limited | Professional & scientific | 1990 |
| Callies Cakes Ltd | Manufacturing | 2024 |
| Callum James Kitchens & Bathrooms Limited | Construction | 2016 |
| Callum Small Mortgages Limited | Financial services | 2020 |
| Calyza Ltd | Construction | 2009 |
| Cambria Trust | Education | 2007 |
| Camp Grenada Construction CIC | Education | 2025 |
| Campal Camper Van Conversions Ltd | Manufacturing | 2018 |
| Campal Holdings Limited | Administrative & support | 2021 |
| Campal Properties Ltd | Financial services | 2020 |
| CAN 23 Ltd | Hospitality | 2025 |
| Cannon Curtains Blinds and Canopies Ltd | Other services | 2011 |
| Canted Limited | Professional & scientific | 2014 |
| Cantium Electronics Limited | Administrative & support | 2008 |
| Capelwood Civils UK Limited | Construction | 2023 |
| Capelwood Construction Limited | Construction | 2017 |
| Capelwood Contractors Ltd | Professional & scientific | 2011 |
| Capelwood Utilities Limited | Construction | 2005 |
| Capelwood Utilities UK Ltd | Other services | 2011 |
| Capital Guards UK Limited | Administrative & support | 2008 |
| Car Van Buyers Limited | Wholesale & retail | 2022 |
| Carbon Theme Limited | Wholesale & retail | 2024 |
| Card Safe Ltd | Wholesale & retail | 2023 |
| Care and Choice Ltd | Other services | 2012 |
| Care Consultant ACC Framework Ltd | Information & communication | 2024 |
| Care Just 4U Sittingboune Limited | Health & social care | 2025 |
| Care Matrix Limited | Administrative & support | 2020 |
| Careative Ltd | Professional & scientific | 2025 |
| Carelaborative Ltd | Education | 2025 |
| Carousel Logistics Holdings Limited | Transport & logistics | 2013 |
| Carousel Logistics Limited | Transport & logistics | 1985 |
| Cartref Supported Living Services Ltd | Health & social care | 2018 |
| Casewick Limited | Construction | 2018 |
| Castle Road Management Company Limited | Real estate | 2005 |
| Castle Star Property Company Limited | Real estate | 1964 |
| Castrian Developments Ltd | Real estate | 2008 |
| Caterers ARE US Limited | Hospitality | 2019 |
| Caytech Limited | Professional & scientific | 2021 |
| Cazzana Limited | Wholesale & retail | 2012 |
| CBB Franchise Ltd | Manufacturing | 2014 |
| CC Contract Maintenance Limited | Manufacturing | 2012 |
| CC Luxury Representation Ltd | Administrative & support | 2025 |
| Cctvman Limited | Manufacturing | 2005 |
| CCW Global Limited | Financial services | 2019 |
| CDM Community Sport Ltd | Education | 2024 |
| CDM Maintenance and Construction Limited | Construction | 1997 |
| Cedar Grove Surveyors Limited | Administrative & support | 2007 |
| Celac Global Lines Ltd | Wholesale & retail | 2024 |
| Celaldoeslaw Ltd | Education | 2026 |
| Celeste Ltd | Information & communication | 2019 |
| CELLER8 Ltd | Real estate | 2025 |
| Cellpoint Technology Ltd | Information & communication | 2024 |
| Cement Industries Limited | Other services | 2024 |
| Centaly Limited | Information & communication | 2024 |
| Centre for Asian and Middle Eastern Studies Ltd | Education | 2024 |
| Centurion Management Ltd | Other services | 2007 |
| Certain Holdings Limited | Financial services | 2002 |
| Certain Sight Limited | Extraterritorial | 2002 |
| CGF Heating Ltd | Other services | 2015 |
| Cgi's Jointing & Cabling Services Ltd | Construction | 2019 |
| Chalkwell Coach Hire Limited | Transport & logistics | 1990 |
| Chalkwell Garage Limited | Wholesale & retail | 2017 |
| Chalkwell Garage Services Limited | Wholesale & retail | 2017 |
| Chalkwell Limited | Transport & logistics | 2011 |
| Chalkwell Maintenance Services Ltd | Administrative & support | 2017 |
| Chalkwell Services Limited | Wholesale & retail | 2017 |
| Champion Court Farm Limited | Agriculture & fishing | 1977 |
| Chanal Property Ltd | Professional & scientific | 2023 |
| Chandler Mechanical Services Limited | Construction | 2009 |
| Changing TH3 NARRATIV3 Ltd | Wholesale & retail | 2022 |
| Chapwood Commercial Ltd | Other services | 2021 |
| Chapwood Holdings Ltd | Administrative & support | 2017 |
| Chapwood Investments Ltd | Real estate | 2021 |
| Chardikla Kular Transport Ltd | Transport & logistics | 2025 |
| Charles Stephens Properties Limited | Real estate | 2024 |
| Charles Tong French Polishing Ltd | Administrative & support | 2006 |
| Charlton Web Development Ltd | Information & communication | 2025 |
| Charterhouse Properties LLP | | 2002 |
| Chatter Tots Ltd | Education | 2019 |
| Check Management Ltd | Hospitality | 2020 |
| Cheesman Manufacturing Limited | Manufacturing | 2009 |
| Chefs Wardrobe Ltd | Wholesale & retail | 2024 |
| Chelsea Court Construction Ltd | Real estate | 2024 |
| Chequers Electrical Services Limited | Construction | 2010 |
| Cheran's Bakery Ltd | Real estate | 2023 |
| Cherry Deal 2 Ltd | Construction | 2021 |
| Cherry Deal Investments Limited | Construction | 2020 |
| Chesley Storage Ltd | Real estate | 2020 |
| Chesson Ltd | Professional & scientific | 2024 |
| Chetney View Management Limited | Real estate | 2004 |
| Chevening Court Limited | Households | 2013 |
| Chezok Limited | Health & social care | 2013 |
| Chickenstock Music Festival Limited | Arts & recreation | 2022 |
| Chilidog Veterinary Services Limited | Professional & scientific | 2015 |
| Chilston Consulting Ltd | Information & communication | 2019 |
| Chimnand Limited | Wholesale & retail | 2025 |