| Come YE in (Hong Kong) Limited | Hospitality | 2021 |
| Comfy Medicare Ltd | Health & social care | 2025 |
| Commando Rugby School Ltd | Arts & recreation | 2018 |
| Commercial Kitchen Services Limited | Wholesale & retail | 2025 |
| Commercial Properties North West Limited | Administrative & support | 2015 |
| Commerical Fish & Chips Limited | Hospitality | 2017 |
| Common Edge Management Company Limited | Households | 1997 |
| Communicate Clearly Speech Therapy Ltd | Other services | 2021 |
| Communicate SLT CIC | Professional & scientific | 2013 |
| Communicloud Limited | Other services | 2017 |
| Community Evaluation Ltd | Wholesale & retail | 2025 |
| Community Hub Blackpool CIC | Health & social care | 2022 |
| Community Sporting Partnership UK Ltd | Professional & scientific | 2023 |
| Compassionate Support Services Ltd | Health & social care | 2023 |
| Compex Limited | Construction | 2009 |
| Complete Catering Lancs Limited | Hospitality | 2015 |
| Complete Computing Company (UK) Limited | Wholesale & retail | 2018 |
| Complete Concrete North West Ltd | Construction | 2022 |
| Complete Construction Lancs Ltd | Construction | 2015 |
| Complete Leads Ltd | Information & communication | 2023 |
| Complete Networking Solutions Ltd | Information & communication | 2020 |
| Complete Online Solutions Ltd | Information & communication | 2005 |
| Complete Probate Ltd | Other services | 2024 |
| Complete Sales and Services Ltd | Other services | 2019 |
| Complex Control Systems Ltd | Professional & scientific | 2024 |
| Comptech IT Solutions Ltd | Information & communication | 2008 |
| Computer Automation Ltd | Wholesale & retail | 2025 |
| Comtech-It Solutions Limited | Information & communication | 2015 |
| Conan Commercial Limited | Real estate | 2019 |
| Conann DAS Ltd | Wholesale & retail | 2025 |
| Concept Flooring Limited | Wholesale & retail | 2024 |
| Concept Glass Contracts Limited | Construction | 2010 |
| Concept Nails Limited | Other services | 2022 |
| Concepts Design Solutions Ltd | Professional & scientific | 2017 |
| Confettirain Bridal Ltd | Wholesale & retail | 2017 |
| CONFORM365 Ltd | Information & communication | 2025 |
| Congleton Trade Centre Management Ltd | Real estate | 2012 |
| Congo Design Limited | Arts & recreation | 2013 |
| Conifers Consultancy Ltd | Information & communication | 2019 |
| Conifers Management (Hambleton) Company Limited(The) | Households | 1983 |
| Coniston Road Ltd | Real estate | 2025 |
| Connect Care Holdings Limited | Real estate | 2021 |
| Connect Care Solutions Limited | Health & social care | 2020 |
| Connected Supplements Limited | Wholesale & retail | 2025 |
| Connected Synergy Limited | Information & communication | 2024 |
| Connections Ltd | Health & social care | 2025 |
| Connectivity Solutions Limited | Information & communication | 2012 |
| Connolly Commercial Ltd | Real estate | 2023 |
| Conradh Sonas Limited | Information & communication | 2016 |
| Conservatory Roof Insulation Systems TA Crispro Ltd. | Construction | 2019 |
| Considered Businesses Ltd | Information & communication | 2024 |
| Console Passion Limited | Wholesale & retail | 2010 |
| Constant IT (Southern) Limited | Information & communication | 2016 |
| Constantia Ltd | Professional & scientific | 2019 |
| Constantia Property Services Ltd | Real estate | 2024 |
| Constructa Group Ltd | Construction | 2025 |
| Construction Management Contract Services Ltd | Construction | 2020 |
| Construction Solutions Services Ltd | Construction | 2025 |
| Constructive Asset Finance Ltd | Financial services | 2023 |
| Consultera CIC | Professional & scientific | 2024 |
| Consultera Group Ltd | Information & communication | 2026 |
| Consulting Central Ltd | Real estate | 2020 |
| Contex Construction Limited | Wholesale & retail | 1980 |
| Contexta Services Ltd | Information & communication | 2026 |
| Contract Floors Limited | Construction | 2005 |
| Contract Joinery (Lancashire) Ltd | Construction | 2012 |
| Contractor Corner CIS Limited | Professional & scientific | 2020 |
| Contrado Consulting Ltd | Professional & scientific | 2020 |
| Control Technical Solutions Limited | Information & communication | 2009 |
| Converting Solutions Ltd | Manufacturing | 2020 |
| Cookie's Canines Ltd | Manufacturing | 2024 |
| Cooks Creations Limited | Hospitality | 2024 |
| Cookson Holdings Limited | Wholesale & retail | 2020 |
| Cooksons Group Limited | Wholesale & retail | 2024 |
| Cooksons Transport Group Ltd | Transport & logistics | 2025 |
| Cool Beans Coffee UK Limited | Wholesale & retail | 2019 |
| Cool Beans Online Retail Limited | Wholesale & retail | 2019 |
| Cool Blades Limited | Wholesale & retail | 2011 |
| Cool Street Vintage Ltd | Wholesale & retail | 2024 |
| Coolfun Limited | Hospitality | 2003 |
| Coop Properties Ltd | Real estate | 2018 |
| Cooper Nimmo Ltd | Professional & scientific | 2012 |
| Copeland & Carrel Ltd | Administrative & support | 2023 |
| Copper Lounge Limited | Hospitality | 2014 |
| Copper Platter Limited | Hospitality | 2019 |
| Coral Design Limited | Administrative & support | 1998 |
| Corbett Construction Ltd | Construction | 2025 |
| Cordeaux Consultants Ltd | Professional & scientific | 2025 |
| Core Group NW Ltd | Construction | 2025 |
| Core Heat Plumbing, Heating & Renewables Limited | Construction | 2025 |
| Core Publishing Limited | Professional & scientific | 2010 |
| CORE4FOOTBALL Ltd | Arts & recreation | 2025 |
| Corefour Films Limited | Information & communication | 2018 |
| Corepairs Ltd | Wholesale & retail | 2026 |
| Corleone Limited | Information & communication | 2011 |
| Corless Properties Limited | Real estate | 2020 |
| Corona Carriacou Ltd | Information & communication | 2016 |
| Corporate Approved Inspectors Limited | Construction | 2019 |
| Cosi Properties Ltd | Real estate | 2025 |
| Cosmic Cowgirl Ltd | Wholesale & retail | 2025 |