| Compliant Lease Plans Ltd | Professional & scientific | 2025 |
| Complicedge Ltd | Information & communication | 2026 |
| Component Properties Limited | Administrative & support | 2015 |
| Composite Door Suppliers Ltd | Extraterritorial | 2025 |
| Comprehensive Appliances Ltd | Other services | 2020 |
| Comprehensive Future Ltd | Education | 2015 |
| Compressor Systems (West) Limited | Manufacturing | 2000 |
| Compriz Limited | Administrative & support | 2014 |
| Compton Community Services Ltd | Health & social care | 2021 |
| Compton GSR Limited | Manufacturing | 2011 |
| Compusis Ltd | Professional & scientific | 1997 |
| Compusystems Associates Limited | Information & communication | 1995 |
| Computabyte Limited | Professional & scientific | 1993 |
| Computastat Group Limited | Extraterritorial | 1988 |
| Computer Networks Global Ltd | Information & communication | 1997 |
| Computer Problem Solutions Limited | Information & communication | 2005 |
| Computerhire South West Limited | Information & communication | 1997 |
| Computerminds Limited | Information & communication | 2003 |
| Computershare Advantage Payment Services Limited | Financial services | 2025 |
| Computershare Advantage Trustees Limited | Financial services | 2025 |
| Computershare Company Secretarial Services Limited | Administrative & support | 2020 |
| Computershare Entity Solutions (UK) Limited | Information & communication | 1996 |
| Computershare Investments (UK) (NO.3) Limited | Professional & scientific | 2003 |
| Computershare Investor Services PLC | Financial services | 1998 |
| Computershare Limited | Professional & scientific | 1995 |
| Computershare Technology Services (UK) Limited | Information & communication | 1996 |
| Computershare Trustees Limited | Financial services | 1998 |
| Computershare Voucher Services Limited | Administrative & support | 2003 |
| Computerworld (Systems) Limited | Information & communication | 2002 |
| Computerworld (Training) Ltd | Education | 1992 |
| Computerworld Group Limited | Financial services | 2018 |
| Computing Services and Solutions Limited | Information & communication | 2012 |
| Compuwave Limited | Administrative & support | 2005 |
| Comron Rowe Legal Ltd | Professional & scientific | 2015 |
| Con.Bristol Ltd | Hospitality | 2024 |
| Conamer Limited | Information & communication | 2014 |
| Concannon Consultants Limited | Professional & scientific | 2003 |
| Concatenix Limited | Professional & scientific | 2026 |
| Concentric Ltd | Professional & scientific | 2022 |
| Concept Air Conditioning & Renewable Services Ltd | Professional & scientific | 2023 |
| Concept Bars Limited | Manufacturing | 1996 |
| Concept Capital Corporation Ltd | Financial services | 2024 |
| Concept CNC South Limited | Financial services | 2022 |
| Concept Consultancy Ltd | Professional & scientific | 2020 |
| Concept Decor Bristol Ltd | Construction | 2021 |
| Concept Decorating Ltd | Construction | 2009 |
| Concept Engineering Services Ltd | Professional & scientific | 2020 |
| Concept Finishing CF Limited | Manufacturing | 2010 |
| Concept Furniture Installations Limited | Construction | 2018 |
| Concept Photography Ltd | Professional & scientific | 2006 |
| Concept Property Maintenance Ltd | Construction | 2014 |
| Concept Services Group Holdings Ltd | Professional & scientific | 2023 |
| Concept Space & Design Limited | Construction | 2021 |
| Concept Turning Ltd | Manufacturing | 2022 |
| Concept-Turning -Holdings Ltd | Professional & scientific | 2024 |
| CONCEPT4 Limited | Professional & scientific | 2002 |
| Conceptare Limited | Professional & scientific | 2018 |
| Concepture Ltd | Extraterritorial | 2002 |
| Conchar Consulting Limited | Administrative & support | 2014 |
| Conciairge Ltd | Transport & logistics | 2006 |
| Concilium Limited | Information & communication | 1999 |
| Conclave Consulting Ltd | Other services | 2026 |
| Concord Homecare Ltd | Administrative & support | 2018 |
| Concorde Holdings Ltd | Real estate | 2022 |
| Concorde Support Ltd | Administrative & support | 2019 |
| Concordia Houses Limited | Real estate | 2019 |
| Concorsco Limited | Information & communication | 2014 |
| Concrete Copy Ltd | Professional & scientific | 2022 |
| Concrete Fabrications Limited | Manufacturing | 1999 |
| Concypt Limited | Information & communication | 2024 |
| Condense Reality Ltd | Information & communication | 2019 |
| Condor Ventures Limited | Financial services | 2023 |
| Conduit Talent Ltd | Administrative & support | 2026 |
| Conen Property Development Ltd | Real estate | 2021 |
| Coney Deli Ltd | Wholesale & retail | 2025 |
| Confer With Limited | Information & communication | 2020 |
| Conference Astute Limited | Hospitality | 2012 |
| Confidence in Continence Ltd | Health & social care | 2025 |
| Config Connect Limited | Other services | 2016 |
| Configur Tech Limited | Information & communication | 2024 |
| Configured Things Limited | Information & communication | 2018 |
| Confloor Ltd | Manufacturing | 2025 |
| Conflouk Ltd | Information & communication | 2025 |
| Congar International UK Limited | Professional & scientific | 2007 |
| Congenital Heart UK Ltd | Extraterritorial | 2019 |
| Congresbury Auto Centre Limited | Wholesale & retail | 2025 |
| Congresbury Community Transport | Transport & logistics | 2011 |
| Congresbury Kennels Booking Services LLP | | 2022 |
| Congresbury Motors Ltd | Wholesale & retail | 2025 |
| Congresbury Sports and Recreation Club Limited | Arts & recreation | 2023 |
| Conham View Management Company Limited | Households | 2017 |
| Conitor Ltd | Real estate | 2022 |
| Conjurer Ltd | Information & communication | 2017 |
| Conker Construction Ltd. | Construction | 2021 |
| Conker Properties Ltd | Real estate | 2017 |
| Conmortar Properties Limited | Real estate | 2024 |
| Connascent Consulting Limited | Information & communication | 2024 |
| Connaught Mansions Management Company Limited | Households | 1979 |
| Connect Accounting Services Ltd | Professional & scientific | 2022 |
| Connect Apartments Limited | Real estate | 2018 |