| Callisto Design Ltd | Professional & scientific | 2021 |
| Callum Leigh Electrical Ltd | Construction | 2024 |
| Callum Mcguire Media Ltd | Professional & scientific | 2026 |
| Callums Couriers Limited | Transport & logistics | 2026 |
| Callytics Ltd | Information & communication | 2022 |
| Cally’S Consulting Limited | Health & social care | 2025 |
| Calm Hippo Limited | Wholesale & retail | 2025 |
| Caloris Design Consultancy Ltd | Professional & scientific | 2021 |
| Cals Construction Ltd | Construction | 2018 |
| Calum Langley Creative Ltd | Administrative & support | 2025 |
| CAM & PEA Limited | Professional & scientific | 2025 |
| Camassiss Limited | Administrative & support | 2014 |
| Cambridge Innovation Center 22 Bishopsgate Limited | Real estate | 2020 |
| Cambridge Innovation Center UK Holdings Limited | Financial services | 2020 |
| Cambridge Innovation Center UK Operations Limited | Real estate | 2020 |
| Cambridge Statistics Limited | Financial services | 2017 |
| Camco Automotive Limited | Wholesale & retail | 2007 |
| Camcoat Performance Coatings Limited | Manufacturing | 2011 |
| Camex Engineering Limited | Administrative & support | 2015 |
| Camford Advisory Limited | Administrative & support | 2025 |
| Camfu Medical Co. Ltd | Wholesale & retail | 2024 |
| Camham Property Group Ltd | Real estate | 2025 |
| Camille Yvon Limited | Administrative & support | 2024 |
| Campbell Compete Services Ltd | Construction | 2025 |
| Campbell's Training Limited | Education | 2021 |
| Campbell-Jones Engineering Limited | Administrative & support | 2010 |
| Campbells (Bookmakers) Limited | Arts & recreation | 1961 |
| Camperkraft Limited | Wholesale & retail | 2021 |
| Campgas Ltd | Other services | 2017 |
| Camphor Games Ltd | Information & communication | 2018 |
| Campion Point Apartments (Management Company) Limited | Households | 2017 |
| Canaan Technologies Ltd | Information & communication | 2024 |
| Canada Quays (Developments) Limited | Construction | 2004 |
| Canada Quays Limited | Administrative & support | 2002 |
| Canan (NW) Limited | Hospitality | 2020 |
| Canary Wharf Tutors LP | | 2025 |
| Cancello Ltd | Hospitality | 2022 |
| Candi Kastle Sweets Ltd | Wholesale & retail | 2025 |
| Candid Comms Ltd | Professional & scientific | 2025 |
| Candolim Express Ltd | Hospitality | 2020 |
| Candy Domestic Appliances Limited | Wholesale & retail | 1973 |
| Candy Holdings Limited | Financial services | 1986 |
| Candy Lights Ltd | Professional & scientific | 2019 |
| Canine Assisted Pest Eradication Limited | Other services | 2016 |
| Canis Solutions Ltd | Administrative & support | 2024 |
| Cannock Building Services Limited | Energy | 2012 |
| Cannon Fire Life Safety Ltd | Administrative & support | 2014 |
| Cannon Fire Protection Limited | Administrative & support | 2014 |
| Cannon Fire Safety Limited | Other services | 2020 |
| Cannon Fire Sprinklers Contracts Ltd | Administrative & support | 2014 |
| Cannon Fire Trade Services Limited | Administrative & support | 2014 |
| Cannon Passive Fire Limited | Administrative & support | 2022 |
| Canri Media Limited | Professional & scientific | 2025 |
| Cantona Property Limited | Real estate | 2024 |
| Canvin Reid Consultants Limited | Information & communication | 2014 |
| Canzip Ltd | Administrative & support | 2023 |
| Cape Building Products Limited | Professional & scientific | 1952 |
| Cape Calsil Group Limited | Professional & scientific | 1993 |
| Cape Calsil Systems Limited | Professional & scientific | 1997 |
| Cape Claims Services Limited | Financial services | 2005 |
| Cape Contracts International Limited | Professional & scientific | 1980 |
| Cape Durasteel Limited | Professional & scientific | 1934 |
| Cape East (UK) Limited | Professional & scientific | 1998 |
| Cape East Limited | Construction | 1976 |
| Cape Executive Ltd | Wholesale & retail | 2016 |
| Cape Holdco Limited | Financial services | 2014 |
| Cape Industrial Services Europe Limited | Professional & scientific | 2002 |
| Cape Industrial Services Group Limited | Professional & scientific | 1997 |
| Cape Industries Limited | Professional & scientific | 1957 |
| Cape Insulation Limited | Professional & scientific | 1960 |
| Cape Intermediate Holdings Limited | Professional & scientific | 1893 |
| Cape Pension Trustees Limited | Professional & scientific | 1980 |
| Cape Rock Engineering Limited | Administrative & support | 2014 |
| Cape Specialist Coatings Limited | Professional & scientific | 1945 |
| Cape UK Group Services Limited | Professional & scientific | 2016 |
| Cape UK Holdings Newco Limited | Professional & scientific | 2011 |
| Capel Automation Ltd | Wholesale & retail | 2023 |
| Capex Accounting Ltd | Professional & scientific | 2022 |
| Capital IT Solutions Limited | Information & communication | 2010 |
| Capital J Limited | Financial services | 2003 |
| Capital Nest Lettings Ltd | Real estate | 2025 |
| Capital Nest Properties NW Ltd | Real estate | 2025 |
| Capital Relations Limited | Education | 2011 |
| Capper Shaw Electrical Limited | Construction | 2008 |
| Cappuccino Communications Limited | Other services | 2018 |
| Capra Solutions Limited | Administrative & support | 2013 |
| Captain Hook Warrington Ltd | Hospitality | 2025 |
| Captain Power Wash Limited | Administrative & support | 2025 |
| Captain's Table Limited | Hospitality | 2026 |
| Capvs Design Ltd | Administrative & support | 2023 |
| Car & Commercial Radiators (Warrington) Limited | Real estate | 1982 |
| Car Colour Care Limited | Wholesale & retail | 2004 |
| Car Diagnostic Centre Ltd | Wholesale & retail | 2020 |
| Car Karl Trans Ltd | Wholesale & retail | 2022 |
| Car Lease HQ Limited | Wholesale & retail | 2019 |
| Car Park People Park, Stay and FLY Limited | Transport & logistics | 2020 |
| Car Sale Point Ltd | Wholesale & retail | 2018 |
| Cara Devine Consulting Ltd | Information & communication | 2023 |
| Carabel Limited | Real estate | 2017 |
| Caradel Investments Limited | Real estate | 2011 |