| CNS Property Holdings Ltd | Real estate | 2022 |
| Coach Travel Solutions Ltd | Transport & logistics | 2017 |
| Coastal City Creative UK Limited | Information & communication | 2026 |
| Coastal Holiday Lets Limited | Hospitality | 2010 |
| Coben Healthcare Limited | Administrative & support | 2016 |
| Cobra Inns Limited | Hospitality | 2020 |
| Coceptive Ltd | Wholesale & retail | 2025 |
| Cocker & Proctor Limited | Construction | 2017 |
| Cocos Puppy Boutique Ltd | Wholesale & retail | 2019 |
| Code Fact Solutions Ltd | Information & communication | 2023 |
| Codfear Solutions Ltd | Information & communication | 2025 |
| Coffee Concepts (Whalley) Limited | Wholesale & retail | 2002 |
| Cognizant Therapy Ltd | Health & social care | 2023 |
| Cohiba Communications Limited | Information & communication | 2020 |
| Coin Refunds Limited | Administrative & support | 2025 |
| Collective Airline Limited | Administrative & support | 2024 |
| Collectivehq Limited | Professional & scientific | 2018 |
| College of Career Development UK Ltd | Information & communication | 2024 |
| Collinge & Co Construction Limited | Construction | 2020 |
| Collinwood Homes Ltd | Construction | 2021 |
| Colour Cloud Limited | Administrative & support | 2018 |
| Coloured Screws International Ltd | Manufacturing | 2025 |
| Colourkings Ltd | Construction | 2024 |
| Columbia Consulting Ltd | Professional & scientific | 2014 |
| Comfi Living Ltd | Wholesale & retail | 2020 |
| Comfort Beauty Ltd Ltd | Wholesale & retail | 2024 |
| Comfort Kingdom Ltd | Manufacturing | 2020 |
| Comfort Sofa Design Limited | Manufacturing | 2019 |
| Comfy Care Service Ltd | Health & social care | 2014 |
| Comfy Cave UK Limited | Wholesale & retail | 2025 |
| Command Haus Media Ltd | Professional & scientific | 2025 |
| Commerce Depot Limited | Wholesale & retail | 2026 |
| Commercial Care Ltd | Wholesale & retail | 2016 |
| Commercial Fleet Developments Limited | Professional & scientific | 2019 |
| Commercial Kitchen and Laundry Solutions UK Ltd | Wholesale & retail | 2020 |
| Commercial Kitchen Assistance Ltd | Professional & scientific | 2013 |
| Commercial Laundry and Catering Services Ltd | Manufacturing | 2019 |
| Commercial Regional Investments Ltd | Real estate | 2022 |
| Commercial Regional Space Limited | Real estate | 2015 |
| Commerical Kitchen Equipement Ltd | Wholesale & retail | 2021 |
| Commit to BE Fit Ltd | Other services | 2010 |
| Comms Source Ltd | Information & communication | 2008 |
| Communication Vantage Ltd | Professional & scientific | 2019 |
| Community Acupuncture UK CIC | Health & social care | 2024 |
| Community Beats CIC | Education | 2019 |
| Community Central CIC | Information & communication | 2021 |
| Community Clothing (Lancashire) Ltd | Manufacturing | 2022 |
| Community Harmony Project CIC | Health & social care | 2022 |
| Community Quality Care Services Ltd | Health & social care | 2021 |
| Community Spirit BWD CIC | Health & social care | 2016 |
| Company 2 2024 Limited | Professional & scientific | 2024 |
| Company Triage Ltd | Other services | 2021 |
| COMPANY4SALE Limited | Professional & scientific | 2025 |
| Compass Properties Investment Ltd | Real estate | 2023 |
| Compify Technologies Limited | Wholesale & retail | 2021 |
| Complete Academic Services (CAS) UK Ltd | Education | 2021 |
| Complete Combustion Services Ltd | Construction | 2024 |
| Complete Construction Northwest Limited | Construction | 2018 |
| Complete Power Services Ltd | Construction | 2018 |
| Complete Underfloor Heating Limited | Construction | 2022 |
| Computer Connexions Ltd | Other services | 2024 |
| Computerserv Ltd | Information & communication | 2012 |
| Concept Associates Ltd | Information & communication | 2011 |
| Concept Automotive (UK) Ltd | Wholesale & retail | 2014 |
| Concept Blinds Limited | Wholesale & retail | 2015 |
| Concept Vehicle Conversions Ltd | Wholesale & retail | 2020 |
| Concept Vehicle Solutions Ltd | Administrative & support | 2017 |
| Concise Medico Limited | Other services | 2012 |
| Coniston Bay Ltd | Real estate | 2026 |
| Conlon Management Ltd | Real estate | 2023 |
| Connect Cars (UK) Limited | Transport & logistics | 2010 |
| Connect Interpreting and Translation Service Ltd | Professional & scientific | 2013 |
| Connect Partnership Limited | Health & social care | 2026 |
| Connect PH Ltd | Information & communication | 2024 |
| Connect Plus Limited | Wholesale & retail | 2001 |
| Connollys Planning and Development Limited | Professional & scientific | 2013 |
| Conservatory Design Specialists Limited | Manufacturing | 1998 |
| Consider IT Solved Ltd | Information & communication | 2014 |
| Construct Law Ltd | Professional & scientific | 2015 |
| Consult Frank Ltd | Professional & scientific | 2019 |
| Consult Pharma Group Ltd | Wholesale & retail | 2026 |
| Consultancy & Facilitation Ltd | Professional & scientific | 2020 |
| Consultants & Specialist Surveyors Ltd | Construction | 2005 |
| Contain-It Storage Ltd | Transport & logistics | 2020 |
| Contract Embroidery Production Ltd | Real estate | 2024 |
| Controls 4 Steam UK Limited | Professional & scientific | 2007 |
| Convenience Store Limited | Wholesale & retail | 1998 |
| Convey Panel Management Limited | Professional & scientific | 2022 |
| Cooke and Mellor Recruitment Limited | Administrative & support | 1999 |
| Cookson Builders Limited | Real estate | 1989 |
| Cool Soothe Ltd | Wholesale & retail | 2025 |
| Coolkit IP Limited | Financial services | 2020 |
| Coolkit Limited | Manufacturing | 2001 |
| Cooper Plumbing & Heating (N.W) Ltd | Construction | 2025 |
| Cooper Property Management (Lancs) Limited | Households | 2023 |
| Cooper's Fresh Bins Limited | Other services | 2014 |
| Core Cater Supplies Ltd | Wholesale & retail | 2026 |
| Core Network Group Limited | Information & communication | 2016 |
| Core Panels Ltd | Wholesale & retail | 2025 |
| Core Rock Ltd | Wholesale & retail | 2025 |