| Coda Engineering Ltd | Professional & scientific | 2023 |
| Code LAB Creations Ltd | Information & communication | 2025 |
| Cody Thompson Ltd | Professional & scientific | 2026 |
| Cohann Group Limited | Professional & scientific | 2020 |
| Coisa Nostra Ltd | Hospitality | 2025 |
| Cold Lava AI Ltd | Information & communication | 2025 |
| Coleridge Crafts Limited | Wholesale & retail | 2024 |
| Coley Engineering Limited | Professional & scientific | 2021 |
| Colham Limited | Wholesale & retail | 2015 |
| Colin Lunt Ltd | Wholesale & retail | 2019 |
| Colin Snowdon Limited | Professional & scientific | 2015 |
| Colin Warren Consulting Ltd | Professional & scientific | 2026 |
| Collaboration Bebington Ltd | Hospitality | 2023 |
| College Coach Alliance Limited | Arts & recreation | 2025 |
| Colley Lets Ltd | Real estate | 2024 |
| Collinge & Co Limited | Other services | 1976 |
| Collinge & Co Training Limited | Other services | 1964 |
| Collinge & Collinge Enterprises Limited | Professional & scientific | 1989 |
| Collings First AID Ltd | Wholesale & retail | 2026 |
| Collings Supplies Ltd | Wholesale & retail | 2025 |
| Collins Properties (UK) Limited | Extraterritorial | 2004 |
| Collision Engineers Ltd | Professional & scientific | 2015 |
| Colour Collective Salon Ltd | Other services | 2024 |
| Colour Genie Group Limited | Wholesale & retail | 2015 |
| Com-Unity Consulting Ltd | Professional & scientific | 2024 |
| Combatting Carbon Limited | Information & communication | 2022 |
| Come 2 the Edge Ltd | Professional & scientific | 2018 |
| Comex Entertainment Ltd | Arts & recreation | 2020 |
| Commercial Building Services (UK) Ltd | Construction | 2019 |
| Commercial Colours Limited | Wholesale & retail | 2005 |
| Commercial Hangers Limited | Wholesale & retail | 2003 |
| Commonplace Books Ltd | Wholesale & retail | 2022 |
| Community Capacity Consultancy Ltd | Professional & scientific | 2024 |
| Community Corners (North West) Ltd | Education | 2023 |
| Community Supported Living Limited | Health & social care | 2002 |
| Compass and Flint Limited | Administrative & support | 2016 |
| Compass Court Limited | Households | 2003 |
| Compass Marine Services Limited | Extraterritorial | 1998 |
| Compass Partitions Limited | Manufacturing | 2020 |
| Compass Points Ltd | Transport & logistics | 2007 |
| Complete Electrical NW Limited | Construction | 2025 |
| Complete Fundraising Solutions Limited | Other services | 2021 |
| Complete GAS Limited | Construction | 2003 |
| Complete Handling (Northern) Limited | Wholesale & retail | 2000 |
| Complete Occlusion Ltd | Health & social care | 2026 |
| Complete Tanning Essentials Ltd | Other services | 2025 |
| Compliance Projects Limited | Extraterritorial | 2013 |
| Compliance Solutions (UK) Ltd | Professional & scientific | 1999 |
| Compliancy Group Ltd | Professional & scientific | 2025 |
| Computer Business Forms Limited | Manufacturing | 1983 |
| Computer Centres (UK) Limited | Extraterritorial | 1993 |
| Comquat Ltd | Professional & scientific | 2013 |
| Comtech Professional Resources Ltd | Information & communication | 2018 |
| Concasarts Entertainment Company Limited | Arts & recreation | 2016 |
| Concept Analytics Ltd | Information & communication | 2020 |
| Concept Commercial & Bridging Finance Limited | Financial services | 2025 |
| Concept Estates (Wirral) Limited | Real estate | 2022 |
| Concept Mortgages Limited | Financial services | 2007 |
| Concept Shopfitters Limited | Manufacturing | 2018 |
| Concept to Delivery Limited | Professional & scientific | 2015 |
| Concept Windows & Renovations Limited | Administrative & support | 2007 |
| Concisus Limited | Professional & scientific | 2019 |
| Concrete Sports Limited | Construction | 2011 |
| Conectapipe Limited | Manufacturing | 2014 |
| Confidence Prescribed Ltd | Other services | 2025 |
| Confirmed Recruitment Limited | Administrative & support | 2021 |
| Coniston Profiles Limited | Wholesale & retail | 2013 |
| Conlon & Sons Limited | Real estate | 1947 |
| Connect a Car Ltd | Construction | 2021 |
| CONNECT2SOLUTIONS Ltd | Professional & scientific | 2011 |
| Connell Consulting Engineers Limited | Professional & scientific | 2011 |
| Connor Safety & Lifting Ltd | Construction | 2026 |
| Consciousness Designs Limited | Administrative & support | 2014 |
| Consecutive Development & Construction Ltd | Construction | 2024 |
| Construction Market Data Strategies Limited | Professional & scientific | 2025 |
| Construction Recruitment Specialists Ltd | Administrative & support | 2020 |
| Consultcross Limited | Professional & scientific | 2014 |
| Contemporary Property Ltd | Real estate | 2024 |
| Contento R Ltd | Hospitality | 2019 |
| Contract Development Limited | Professional & scientific | 2021 |
| Controlbrand Limited | Professional & scientific | 1998 |
| Controlsolv Ltd | Professional & scientific | 2012 |
| Conway Homes (NW) Ltd | Construction | 1984 |
| Cook Costs Ltd | Administrative & support | 2023 |
| Cook for Good Community Interest Company | Administrative & support | 2019 |
| Cook Legal Costs Ltd | Professional & scientific | 2018 |
| Cook Legal Ltd | Professional & scientific | 2022 |
| Cool DAD Coffee Limited | Wholesale & retail | 2023 |
| Cool Room Limited | Hospitality | 2022 |
| Coopers Construction London Ltd | Construction | 2024 |
| Cope & Co Accountants and Tax Advisors Ltd | Professional & scientific | 2023 |
| Copeland Facilities Management Limited | Administrative & support | 2013 |
| Copeland Group Holdings Limited | Financial services | 2018 |
| Copeland Keyholding and Response Ltd | Extraterritorial | 2018 |
| Copeland Sitewatch Limited | Administrative & support | 2013 |
| Copps Limited | Real estate | 2023 |
| Cora Vista Ltd | Wholesale & retail | 2025 |
| Coralight Limited | Real estate | 1995 |
| Corazon Tattoos Limited | Other services | 2015 |
| Cordoba Trading Limited | Real estate | 2014 |