| Callums Property Limited | Real estate | 2026 |
| Calm Transport Ltd | Transport & logistics | 2016 |
| Calmswell Properties Limited | Real estate | 1972 |
| Calmwater Bay Water SKI and Wake Board Club Ltd | Arts & recreation | 2021 |
| Caltea Ltd | Real estate | 2025 |
| Calum Lyon Ltd | Health & social care | 2010 |
| Calusa Ltd | Real estate | 2023 |
| Calvary Chapel York | Education | 2010 |
| Calweton Veterinary Services Limited | Professional & scientific | 2002 |
| Cambalt House Limited | Administrative & support | 2001 |
| Camberton Ltd | Information & communication | 1998 |
| Cambridge Bloodstock Ltd | Arts & recreation | 2016 |
| Cambridge House Management Company Limited | Households | 1987 |
| Cambridge Mews Management Holdings Limited | Households | 2022 |
| Cambridge Mews Management Limited | Households | 1985 |
| Cambridge People Ltd | Arts & recreation | 2016 |
| Cambridge Swim School LLP | | 2023 |
| Cambs-Pat (UK) Limited | Other services | 2005 |
| Cambs-Pat Ltd | Other services | 2018 |
| Camelot Storage Ltd | Transport & logistics | 2024 |
| Camerons GT Auto Limited | Wholesale & retail | 2011 |
| Campaign for Pubs | Other services | 2020 |
| Campbell Social Limited | Professional & scientific | 2026 |
| Campervango UK Ltd | Administrative & support | 2021 |
| Campey Estates Limited | Real estate | 2015 |
| Campey Pubs & Hotels Limited | Hospitality | 2018 |
| Canal Toys Distribution Limited | Wholesale & retail | 2018 |
| Canalside (Burton Upon Trent) Residential Management Company Limited | Households | 2015 |
| Candacraig Consulting Limited | Professional & scientific | 2023 |
| Candelin Freelance Limited | Information & communication | 2016 |
| Candy Box (York) Ltd | Wholesale & retail | 2021 |
| Candy Links Ltd | Wholesale & retail | 2016 |
| Candy Shop (York) Limited | Wholesale & retail | 2021 |
| Canine Crunch Limited | Manufacturing | 2024 |
| Cann Creative Ltd | Arts & recreation | 2014 |
| Canny Digs Ltd | Real estate | 2025 |
| Canon ROW Ltd | Administrative & support | 2015 |
| Canonbury Rise (Berkeley) Management Company Limited | Real estate | 2018 |
| Cansfield Training Ltd | Information & communication | 2010 |
| Canter Digital Ltd | Professional & scientific | 2026 |
| CAO Catering Ltd | Hospitality | 2022 |
| CAP Engineering and Design Ltd | Professional & scientific | 2011 |
| Capability GAP Limited | Professional & scientific | 2003 |
| Capacitypm Ltd | Professional & scientific | 2024 |
| Cape Clear (Holdings) Limited | Professional & scientific | 2007 |
| Capital Accountancy Training Limited | Education | 2025 |
| Capital Property Partners Limited | Construction | 2017 |
| Capitol Trading UK Limited | Wholesale & retail | 1993 |
| Capoeira Consulting Limited | Professional & scientific | 2006 |
| CAPOEIRA4YOU Ltd | Education | 2019 |
| Captains Quarters (Church Street) Limited | Real estate | 2026 |
| Captivate Displays Ltd | Wholesale & retail | 2023 |
| Car FIX Specialists Limited | Manufacturing | 2021 |
| Car Keys Ltd | Wholesale & retail | 2025 |
| Car Tuning Cloud Limited | Information & communication | 2025 |
| Car-Tec Sales Limited | Wholesale & retail | 2014 |
| Carabine Signalling Ltd | Professional & scientific | 2023 |
| Caradoc (Professional Services) Limited | Professional & scientific | 2010 |
| Caravans Trading Limited | Hospitality | 2020 |
| Carbon 2 Zero Ltd | Construction | 2008 |
| Carbon Cars Ltd | Wholesale & retail | 2026 |
| Carbon Events Bars Ltd | Hospitality | 2022 |
| Carbon Neutral Solutions Limited | Agriculture & fishing | 2006 |
| Carbonetzero Limited | Professional & scientific | 2023 |
| Carboneyes Limited | Professional & scientific | 2025 |
| Carcharodon Holdings Limited | Financial services | 2026 |
| Carchem Ltd | Manufacturing | 2010 |
| Card Booth Ltd | Wholesale & retail | 2023 |
| Cardelis LLP | | 2023 |
| Care & Recreation Holdings Limited | Administrative & support | 1996 |
| Care Action Limited | Health & social care | 2023 |
| Care at Home (York) Ltd | Health & social care | 2024 |
| Care MUM Ltd | Health & social care | 2025 |
| Care Preference Ltd | Health & social care | 2010 |
| Care With Dignity Ltd | Health & social care | 2017 |
| Carerpreneurs CIC | Administrative & support | 2025 |
| Caring Vets (RR) LLP | | 2013 |
| Carl Parkinson Engineering Services Ltd | Professional & scientific | 2023 |
| Carl Winn Joinery Limited | Construction | 2023 |
| Carleton Meadows Management Company Limited | Households | 2014 |
| Carlton Management Services (York) Limited | Real estate | 2000 |
| Carly JAY Design Limited | Wholesale & retail | 2024 |
| Carmelite Consulting Limited | Professional & scientific | 2025 |
| Carneiro Properties Limited | Real estate | 2024 |
| Carol's Bonnie Dogs Limited | Other services | 2025 |
| Carolyn Parker Interior Design Ltd | Wholesale & retail | 2008 |
| Carpa Consulting Limited | Professional & scientific | 2016 |
| Carpenters Arms Cask House Limited | Hospitality | 2025 |
| Carpenters Field (Denmead) Management Company Limited | Households | 2019 |
| Carpenters House (Wetherby) Management Company Limited | Households | 2021 |
| Carr Adora Limited | Professional & scientific | 2022 |
| Carr Barn Limited | Real estate | 2021 |
| Carr Farm Property Management Limited | Households | 2006 |
| Carr Opticians Limited | Health & social care | 2015 |
| Carrington Bewley Limited | Professional & scientific | 2020 |
| Carrington Orthopaedics Limited | Health & social care | 2010 |
| Carruthers Design Ltd | Professional & scientific | 2022 |
| Cars With Character Limited | Administrative & support | 2020 |
| Carshare Parking Limited | Extraterritorial | 2009 |
| Carsis Consulting Ltd | Professional & scientific | 2022 |