| Cadon Properties Ltd | Real estate | 2024 |
| CAI Ning Limited | Other services | 2019 |
| CAL Gavin Limited | Manufacturing | 1980 |
| Calben Quality Planning Limited | Professional & scientific | 2012 |
| Cambridge Functional Medicine Ltd | Health & social care | 2018 |
| Campion Business Group Ltd | Administrative & support | 2020 |
| Candi Property Management Limited | Real estate | 2024 |
| Carbonado Limited | Professional & scientific | 2009 |
| Cardamom Indian Cuisine Alcester Ltd | Hospitality | 2024 |
| Cardinia Consulting Limited | Information & communication | 2016 |
| Care Industries Limited | Construction | 2023 |
| Carl John Spencer Limited | Arts & recreation | 2012 |
| Carson Noble Properties Limited | Real estate | 2022 |
| Castor Praxis Consulting Limited | Professional & scientific | 2000 |
| Catlogix Ltd | Wholesale & retail | 2019 |
| CBD Tiger Limited | Wholesale & retail | 2020 |
| CBW Solihull Limited | Wholesale & retail | 2018 |
| Ccci Strategic Alliances (UK) Ltd. | Real estate | 2002 |
| Ccci Strategic Alliances Limited | Real estate | 2010 |
| Cctv Kits Limited | Wholesale & retail | 2019 |
| CCW Lettings Limited | Real estate | 2026 |
| CCW Plumbing & Heating Ltd | Construction | 2015 |
| Cebi UK Limited | Administrative & support | 1991 |
| Central Enterprise Construction Contractors Ltd | | 2007 |
| Ceremonynature Ltd | Administrative & support | 2019 |
| Cgrp Education and Research Forum Limited | Information & communication | 2016 |
| Chamberlain Joinery Ltd | Construction | 2022 |
| Chard BBQ Ltd | Manufacturing | 2025 |
| Cherry Picked Kicks Limited | Wholesale & retail | 2024 |
| Chesworth & Allan-John Limited | Administrative & support | 2020 |
| China Town NO.1 Ltd | Hospitality | 2025 |
| Chinwezy Ltd | Wholesale & retail | 2023 |
| Chrispy Productions Limited | Transport & logistics | 2014 |
| Christopher Allen Private Clients Limited | Financial services | 2013 |
| Chrobis Limited | Information & communication | 2009 |
| Chromacy Ltd | Information & communication | 2018 |
| Church Fields Wixford Management Company Limited | Households | 2001 |
| Churchill Solutions Limited | Professional & scientific | 2025 |
| Cider Mill Barns Ltd | Real estate | 2018 |
| Citistore Ltd | Administrative & support | 2019 |
| Citrine Mortgages Limited | Financial services | 2020 |
| Clarion Chase Limited | Administrative & support | 2017 |
| Clarion Chase Projects Ltd | Administrative & support | 2025 |
| Clarke Construction (Warwickshire) Ltd | Construction | 2022 |
| Clean N Gleam Crew Limited | Households | 2024 |
| Clear Solutions (Financial Planning) Ltd | Financial services | 2002 |
| Clearview Financial Planning Ltd | Financial services | 2025 |
| CLH Paediatric OT Limited | Health & social care | 2025 |
| Client Construction Company Limited(The) | Extraterritorial | 1979 |
| Climadry Limited | Professional & scientific | 2026 |
| Clinical Care Biotech Ltd | Wholesale & retail | 2025 |
| Clockwork EGG Properties Ltd | Construction | 2025 |
| Clothing Mode Limited | Wholesale & retail | 2026 |
| CM Plus Ltd | Professional & scientific | 2012 |
| Cmax Security Ltd | Administrative & support | 2019 |
| CMC Electrical Installers Limited | Energy | 2009 |
| CMC M&E Limited | Other services | 2020 |
| CMH Group Ltd | Financial services | 2022 |
| CMH Group Properties Ltd | Construction | 2022 |
| CMH Group Serviced Accommodation Ltd | Administrative & support | 2023 |
| CMH Security Services Ltd | Administrative & support | 2019 |
| CMT Materials Limited | Manufacturing | 2024 |
| Coastable Ltd | Wholesale & retail | 2019 |
| Coastlab Ltd | Wholesale & retail | 2023 |
| Coey Limited | Construction | 2016 |
| Coffee Importers Limited | Wholesale & retail | 2023 |
| Coln Systems Forge Ltd | Professional & scientific | 2024 |
| Commercials Group Ltd | Professional & scientific | 2025 |
| Computer Driven Solutions Limited | Information & communication | 2005 |
| Computer Solutions Midlands Limited | Information & communication | 2016 |
| Concentric Technologies Limited | Professional & scientific | 2014 |
| Consol Machining Limited | Manufacturing | 2025 |
| Consol Spares and Service LLP | | 2018 |
| Consortia X Limited | Professional & scientific | 2026 |
| Constantius Limited | Professional & scientific | 2011 |
| Construction Enterprise Ltd | Construction | 2025 |
| Contract Services Limited | Construction | 1998 |
| Controls Know Howe Ltd | Real estate | 2024 |
| Converging Solutions Holdings Limited | Professional & scientific | 2004 |
| Converging Solutions Limited | Manufacturing | 2001 |
| Conway Electrical Limited | Construction | 2009 |
| Corrigan Group Ltd | Real estate | 2025 |
| Cosmia Limited | Information & communication | 2023 |
| Cotswold Chef Cooking Ltd | Education | 2025 |
| Cotswold Coffee Company Limited | Wholesale & retail | 2013 |
| Cotswold Period Restorations Limited | Construction | 2026 |
| Cotswold Therapies Limited | Health & social care | 2022 |
| Cotswold Watch Company Limited | Manufacturing | 2022 |
| Cottage Content Company Limited | Hospitality | 2014 |
| Coughton Mews Management Company Limited | Real estate | 2002 |
| Country Partners Cosmopolitan Ltd | Professional & scientific | 2018 |
| Coventry Roebuck Limited | Hospitality | 2025 |
| CP Auto Servicing Ltd | Wholesale & retail | 2025 |
| CPM Grounds Maintenance Limited | Administrative & support | 2021 |
| Craftbeerhound Ltd | Hospitality | 2015 |
| CRE Communications Limited | Wholesale & retail | 2021 |
| Creative and Brand Limited | Professional & scientific | 2003 |
| Creative Design ( Hollywood ) Limited | Other services | 2011 |
| Credit Management Consulting Limited | Professional & scientific | 1998 |
| Credo Northstar Limited | Other services | 2026 |