| CLL 14MP Limited | Real estate | 2025 |
| CLL Group Limited | Transport & logistics | 2024 |
| Clockwise & Time Pieces Ltd | Wholesale & retail | 2018 |
| Clonara ROW Management Ltd | Professional & scientific | 2026 |
| Cloud Implementation Guides Ltd | Education | 2024 |
| Club Elite Limited | Real estate | 2003 |
| Club Muso Ltd | Arts & recreation | 2020 |
| Clubgp Limited | Education | 2025 |
| Clubtreasurer Limited | Information & communication | 2016 |
| Clydesdale Engineering Limited | Manufacturing | 2015 |
| Clydesdale Forge Limited | Manufacturing | 2015 |
| Clydesdale Jones Limited | Manufacturing | 2015 |
| CMS Solutions Engineerng Limited | Professional & scientific | 2016 |
| CMT Dynamics Limited | Manufacturing | 2015 |
| CMT Tubes & Fittings Limited | Manufacturing | 2015 |
| Cnnect Agency Ltd | Information & communication | 2022 |
| Cnnect Group Limited | Information & communication | 2014 |
| CNS Retail Ltd | Wholesale & retail | 2013 |
| Coach Bowls Limited | Arts & recreation | 2018 |
| Coach House Training and Development Ltd | Education | 2019 |
| Cobalt Communications Ltd | Professional & scientific | 2016 |
| Cobblers & Keys (Leamington Spa) Limited | Manufacturing | 2024 |
| Cobig Company Ltd | Professional & scientific | 2023 |
| Coco UN Limited | Real estate | 2015 |
| Coconi Property Ltd | Real estate | 2024 |
| Coda Security Limited | Information & communication | 2017 |
| Coffee Box Leamington Limited | Hospitality | 2014 |
| Coffee Cure Ltd | Hospitality | 2023 |
| Coffee Mechanics Ltd | Hospitality | 2025 |
| Cognition Holdings Limited | Financial services | 2024 |
| Coisrig Limited | Professional & scientific | 2014 |
| Coles Christmas Trees Limited | Agriculture & fishing | 2018 |
| Colesey Ltd | Real estate | 2020 |
| Collective (Bristol Road) Ltd | Real estate | 2024 |
| Collective 45 Ltd | Professional & scientific | 2021 |
| Collective Build Ltd | Construction | 2024 |
| Collexchange Limited | Wholesale & retail | 2022 |
| Collins Building Partnership Limited | Construction | 2011 |
| Cologic Limited | Administrative & support | 2013 |
| Columbus Commercial Ltd | Wholesale & retail | 2022 |
| Comet Property Ltd | Real estate | 2019 |
| Commercial Energy Performance Limited | Administrative & support | 2023 |
| Comms Technology Ltd | Information & communication | 2019 |
| Community Facilities Ltd | Arts & recreation | 2025 |
| Comp Contracts Limited | Manufacturing | 2025 |
| Company Enterprises Limited | Construction | 2002 |
| Complete Building Services (Southam) Limited | Construction | 2003 |
| Complete Estate Agents (Rugby) Limited | Real estate | 2005 |
| Complete IT Solutions Limited | Information & communication | 2005 |
| Complex Logistics Ltd | Transport & logistics | 2021 |
| Compliance Management Solutions Limited | Administrative & support | 2013 |
| Complianceworks (Midlands) Limited | Administrative & support | 2015 |
| Composites Bidco Limited | Financial services | 2021 |
| Composites Topco Limited | Financial services | 2021 |
| Compressor Sales Asia Ltd | Other services | 2018 |
| Compton Fundraising Consultants Limited | Professional & scientific | 1999 |
| Compton Fundraising Holdings Limited | Professional & scientific | 2018 |
| Compton Gray Limited | Professional & scientific | 2016 |
| Comptons Garage Services Limited | Wholesale & retail | 2013 |
| Conceptual Creations Ltd | Professional & scientific | 2026 |
| Concoct Tech Ltd | Information & communication | 2019 |
| Concoct Technologies Ltd | Information & communication | 2009 |
| Conexio Software Ltd | Information & communication | 2012 |
| Consolo Sound Ltd | Information & communication | 2020 |
| Construction Systems Marketing GmbH Limited | Administrative & support | 2004 |
| Contour Engineering Limited | Administrative & support | 2018 |
| Contract Groundworks (Midlands) Limited | Construction | 2023 |
| Control & Calibration Solutions Limited | Professional & scientific | 2016 |
| Control Break Ltd | Information & communication | 2025 |
| Conway & Co Garden Solutions Ltd | Administrative & support | 2023 |
| Cool Breeze Technology Services Ltd | Information & communication | 2015 |
| Cool FOX Ltd | Wholesale & retail | 2018 |
| Coolski Ltd | Information & communication | 2014 |
| Coombfield Property Holding Ltd | Financial services | 2026 |
| Coombfield Property LLP | | 2025 |
| Cooper and Griffiths Estates Ltd | Households | 2025 |
| Cooper Curtis Accountants Ltd | Professional & scientific | 2012 |
| Cooper Watts Group Ltd | Construction | 2025 |
| Cooper-Mia Property Ltd | Households | 2025 |
| Coplow Woodland Retreat Ltd | Hospitality | 2023 |
| Copperfield Residents Company Limited | Households | 1989 |
| Copston Grange Farms Limited | Agriculture & fishing | 2021 |
| Coral Fabric Imaging Limited | Professional & scientific | 2008 |
| Core Information Management Systems Limited | Professional & scientific | 2001 |
| Core Specialist Solutions Ltd | Construction | 2020 |
| Core Warwickshire Limited | Arts & recreation | 2019 |
| Coreway Engineering Ltd | Professional & scientific | 2013 |
| Corinella Ltd | Manufacturing | 2023 |
| Corner Cottage Bakery Leamington Limited | Manufacturing | 2023 |
| Corner Cottage Bakery School Limited | Hospitality | 2023 |
| Cornwood Finance Limited | Financial services | 2023 |
| Cosmeta Ltd | Wholesale & retail | 2013 |
| Cost Sync Ltd | Information & communication | 2025 |
| Costin Incorporated Limited | Professional & scientific | 2015 |
| Cosy Nest Limited | Real estate | 2022 |
| Cotswold Assessments Limited | Education | 2020 |
| Cotswold Motor Loft Limited | Wholesale & retail | 2025 |
| Cotton Skips Ltd | Water & waste | 2026 |
| Country Manor House Weddings Ltd | Other services | 2012 |
| Countrywide Investment Promotions Ltd | Financial services | 2010 |