| Confix Consulting Ltd | Information & communication | 2024 |
| Confronting Code Limited | Information & communication | 2017 |
| Connect Joinery Limited | Construction | 2008 |
| Connected QA Ltd. | Information & communication | 1998 |
| Consilium Safety Services Limited | Professional & scientific | 2015 |
| Constantin Micesti Ltd | Transport & logistics | 2023 |
| Construction Training & Development Centre Ltd | Construction | 2022 |
| Consult Training Ltd | Education | 2022 |
| Contemporary Traders Limited | Wholesale & retail | 2018 |
| Content by Fibi Ltd | Professional & scientific | 2024 |
| Contigo Advisory Ltd | Professional & scientific | 2025 |
| Continuous Kaizen Solutions Ltd | Information & communication | 2013 |
| Contract Innovation Limited | Professional & scientific | 2015 |
| Contrast Upholstery Limited | Wholesale & retail | 2022 |
| Control Water Environmental Services Ltd | Other services | 2010 |
| Conversus Consulting Ltd | Hospitality | 2016 |
| Convyce Limited | Information & communication | 2010 |
| Coolstuffx Ltd | Administrative & support | 2017 |
| Coombe & Cove Properties Ltd | Real estate | 2025 |
| Cooper Sewell Limited | Administrative & support | 2019 |
| Copperson Ventures Limited | Wholesale & retail | 2020 |
| Coppice Childcare UK Limited | Education | 2013 |
| Corbett Clarke Limited | Professional & scientific | 2013 |
| Corbro Limited | Professional & scientific | 2023 |
| Cordwood Tree Services Limited | Agriculture & fishing | 2026 |
| Core Recruitment Ltd | Administrative & support | 2023 |
| Corelink Comms Ltd | Information & communication | 2025 |
| Corescripts Technologies Ltd | Information & communication | 2023 |
| Corgi Fenestration Scheme Limited | Professional & scientific | 2016 |
| Coriba Limited | Professional & scientific | 2020 |
| Corimiro Properties Limited | Real estate | 2024 |
| Cornerbase Limited | Real estate | 1987 |
| Cornhill Training Consultants Limited | Professional & scientific | 1996 |
| Corso Trans Ltd | Transport & logistics | 2019 |
| Cory's Car Repairs Limited | Wholesale & retail | 2014 |
| Cosmin Business Ltd | Construction | 2023 |
| Cosmin Cozma Ltd | Other services | 2019 |
| Cosno Limited | Wholesale & retail | 2026 |
| Costa’S Maintenance and Repairs Ltd | Real estate | 2024 |
| Costcutter Rugby Ltd | Wholesale & retail | 2017 |
| Costea Trans Ltd | Transport & logistics | 2022 |
| Costello Property Holdings Limited | Real estate | 2021 |
| Costi Cargo Ltd | Transport & logistics | 2020 |
| Costy Ltd | Transport & logistics | 2015 |
| Costy Transport Limited | Transport & logistics | 2011 |
| Cosy-Medic Ltd | Health & social care | 2024 |
| Cotes Investments Ltd | Construction | 2025 |
| Cotesbach Estates Limited | Construction | 2015 |
| Cotesbach Landscaping Limited | Administrative & support | 2002 |
| Coton Meadow (Phase 4) Amenity Land Management Company Limited | Households | 2004 |
| Coton Meadow (Phase 4) Apartment Management Company Limited | Households | 2004 |
| Coton Meadow Amenity Land Management Company Limited | Households | 2003 |
| Coton Meadow Apartment Management Company Limited | Households | 2003 |
| Coton Park Residents Association Limited | Households | 2014 |
| Cotton Consulting Limited | Professional & scientific | 2020 |
| Cottons Audit Services Limited | Professional & scientific | 2022 |
| Cottons Group Limited | Professional & scientific | 2013 |
| Cottons Rugby Office Nominees Limited | Extraterritorial | 2022 |
| Cottwells Construction Ltd | Construction | 2023 |
| Coultersurveying Ltd | Professional & scientific | 2025 |
| Coundon Road Management Company Limited | Real estate | 2005 |
| Counterspace London Ltd | Professional & scientific | 2023 |
| Country PUB & Dining Ltd | Hospitality | 2019 |
| Country Woods and Goods Ltd | Wholesale & retail | 2025 |
| Courier OK Ltd | Transport & logistics | 2018 |
| Courland Grove Properties Limited | Real estate | 2001 |
| Court (Warwickshire) Limited | Construction | 1977 |
| Court Residential Limited | Construction | 1967 |
| Courtesy of ZED Limited | Information & communication | 2019 |
| Courtlend Developments Ltd | Households | 2018 |
| Covaliuc DAN Ltd. | Transport & logistics | 2013 |
| Cove Home Ltd | Manufacturing | 2025 |
| Coventry and Warwickshire Robotics Ltd | Professional & scientific | 2024 |
| Coventry Estate Limited | Construction | 2025 |
| Coventry Laptop Clinic Ltd | Other services | 2017 |
| Coventry Motor Mart,Limited(The) | Real estate | 1919 |
| Covill Properties Limited | Real estate | 2024 |
| Cowley Aesthetics Ltd | Wholesale & retail | 2026 |
| Cowley Electrical Limited | Construction | 2007 |
| CP Equestrian Ltd | Agriculture & fishing | 2023 |
| CP Guttering & Fascia Ltd. | Construction | 2016 |
| CP Scott Property Ltd | Real estate | 2020 |
| Cprn Technology Ltd | Information & communication | 2017 |
| CR Construction Management Limited | Construction | 2018 |
| Crabmill Auto Repairs Limited | Wholesale & retail | 2006 |
| Craig Holmes Transport Solutions Ltd | Transport & logistics | 2019 |
| Craig Leisten Limited | Construction | 2022 |
| Craig Sharman Property Services Limited | Real estate | 2020 |
| Cranton Haulage Limited | Transport & logistics | 2013 |
| Craven Court Management Limited | Households | 1988 |
| CRE8TIVEMESS Limited | Information & communication | 2025 |
| Creation Shopfitters (Midlands) Limited | Professional & scientific | 2005 |
| Creation Shopfitters LLP | | 2013 |
| Creative RC Ltd | Transport & logistics | 2019 |
| Credence Compliance Ltd | Professional & scientific | 2023 |
| Credit Management Consultancy Ltd | Professional & scientific | 2025 |
| Credo Tax Services Ltd | Professional & scientific | 2025 |
| Crescent Real Estate Limited | Real estate | 2011 |
| Crestley Care Ltd | Health & social care | 2023 |
| CRG Management Solutions Ltd | Real estate | 2018 |