| Clifford Consultancy Ltd | Information & communication | 2003 |
| Clifton Engineering Services Ltd | Manufacturing | 2017 |
| Climate Insulation Limited | Construction | 2009 |
| Clinapt UK Limited | Information & communication | 2024 |
| Clinical Diagnostic Services Ltd | Health & social care | 2010 |
| Clinical Finance Limited | Information & communication | 2010 |
| Cloud 9 Events Ltd | Other services | 2020 |
| Cloverleaf Maintenance Ltd | Construction | 2019 |
| Clovernet Communications Limited | Information & communication | 1995 |
| Clutch Consultancy Ltd | Professional & scientific | 2026 |
| CM Browne Limited | Real estate | 2017 |
| CM Group Asset Management Limited | Construction | 2019 |
| CMB Consultancy Services Limited | Administrative & support | 2024 |
| CMC Business Services Limited | Professional & scientific | 2024 |
| CMS Finishes Ltd | Construction | 2024 |
| CN Strategic Advisors LLP | | 2023 |
| Cnfp LLP | | 2006 |
| Co-Operate Investments Limited | Construction | 2020 |
| Coadact Limited | Information & communication | 2016 |
| Coanda NW Ltd | Construction | 2023 |
| Cobco 644 Limited | Administrative & support | 2004 |
| Cocost Ltd | Wholesale & retail | 2020 |
| Code 86 Limited | Hospitality | 2025 |
| Coffee Bars of Cheshire Ltd | Hospitality | 2020 |
| Coffee Extraordinaire Ltd | Hospitality | 2015 |
| Coffee FIX Ltd. | Hospitality | 2010 |
| Coffee Plant Trading Ltd | Wholesale & retail | 2026 |
| Coffeeb Mount Street Limited | Hospitality | 2022 |
| Cofoundra Holdings Limited | Financial services | 2026 |
| Cofoundra IP Limited | Administrative & support | 2026 |
| Cofoundra Limited | Professional & scientific | 2025 |
| Cogile Limited | Real estate | 2016 |
| Cognis Performance Chemicals UK Limited | Extraterritorial | 1999 |
| Cognition Laboratories Ltd | Information & communication | 2024 |
| Cohen Medical and Accounting Services Limited | Financial services | 2013 |
| Coldcell Refrigeration Limited | Construction | 2022 |
| Colhog Ltd | Information & communication | 2025 |
| Collaborate HR Consultancy Ltd | Administrative & support | 2024 |
| Collections Only Rapido Limited | Transport & logistics | 2015 |
| Colossolnutrition Ltd | Wholesale & retail | 2008 |
| Comexsports Ltd | Wholesale & retail | 2025 |
| Comfort Shoes Limited | Wholesale & retail | 2022 |
| Comfy Assets Ltd | Real estate | 2026 |
| Commercceo Limited | Wholesale & retail | 2024 |
| Commercial Property Holdings Limited | Real estate | 2019 |
| Community Labs C.I.C. | Education | 2019 |
| Community of Yours CIC | Arts & recreation | 2020 |
| Compassionate Care 2 U Limited | Health & social care | 2024 |
| Competitive Edge Golf Limited | Arts & recreation | 2009 |
| Complete Childrens Care Ltd | Health & social care | 2021 |
| Complete Legal Marketing Ltd | Information & communication | 2013 |
| Composed Care Ltd | Health & social care | 2024 |
| Concierge+ Ltd | Other services | 2025 |
| Concrete Links Co Limited | Wholesale & retail | 2026 |
| Concrete Recordings Limited | Information & communication | 2004 |
| Concrete Ventures Limited | Administrative & support | 2004 |
| Confidere Ltd | Other services | 2021 |
| Congleton SPV Limited | Real estate | 2025 |
| Conker Communications Ltd | Professional & scientific | 2007 |
| Connect & Create With Adam Ltd | Information & communication | 2024 |
| Connect Shipping Solutions Ltd | Transport & logistics | 2013 |
| Connectd Legal Limited | Professional & scientific | 2022 |
| Connectd Limited | Professional & scientific | 2021 |
| Connected in Care Limited | Health & social care | 2026 |
| Connexa Technology Limited | Administrative & support | 2022 |
| Conraid Pipelines Limited | Construction | 2016 |
| Consegna Talent Solutions Ltd | Administrative & support | 2022 |
| Consolidated Spinners and Manufacturers Limited | Wholesale & retail | 1946 |
| Consort Medical Holdings Limited | Professional & scientific | 2000 |
| Consort Medical Limited | Manufacturing | 1946 |
| Constant FM Ltd | Administrative & support | 2022 |
| Constructive Plant Management Ltd | Administrative & support | 2017 |
| Consultaprint Limited | Manufacturing | 1994 |
| Consultare Services Ltd | Education | 2023 |
| Conteh Sports and Fitness Limited | Wholesale & retail | 2023 |
| Content Chemistry Ltd | Information & communication | 2021 |
| Conxsus Commerial Solutions Ltd | Professional & scientific | 2025 |
| Cooper Mead Investments Ltd | Professional & scientific | 2022 |
| Copa Therapy Ltd | Health & social care | 2024 |
| Coppice Court Freehold Limited | Households | 2012 |
| Coppice Court Right to Manage Company Limited | Households | 2010 |
| Coppock Construction Limited | Construction | 2016 |
| Cor-Pack Ltd | Manufacturing | 2022 |
| Coral House Law Limited | Professional & scientific | 2018 |
| Corbar Limited | Construction | 2018 |
| Core Advertising and Marketing Ltd | Professional & scientific | 2010 |
| Cornerstone Worldwide Limited | Real estate | 2020 |
| Corporate Express (UK) Ltd | Wholesale & retail | 2013 |
| Corporate Supplies (MCR) Ltd | Wholesale & retail | 2020 |
| Corvusfield Limited | Professional & scientific | 2023 |
| Corvusfield Prop Co Ltd | Real estate | 2025 |
| Cory Menorca Limited | Extraterritorial | 2004 |
| Cosmetic Tattoo by LOU Ltd | Wholesale & retail | 2023 |
| Cosmopolitan Living Limited | Real estate | 2025 |
| Cosy Homes (North West) Limited | Construction | 2009 |
| Cosyped Limited | Manufacturing | 2025 |
| Cottonprint Limited | Administrative & support | 2012 |
| Country Rose Properties Limited | Real estate | 2021 |
| Courtside Ventures Limited | Education | 2026 |
| Cozy Move Limited | Construction | 2022 |