| Coco & White Ltd | Construction | 2024 |
| Coco Broadcast Ltd | Professional & scientific | 2021 |
| Coco Noire Limited | Professional & scientific | 2017 |
| Codered Solutions Limited | Information & communication | 2003 |
| Coeur and Associates Ltd | Professional & scientific | 2021 |
| Coffee Clouds Limited | Hospitality | 2023 |
| Colebrook Sturrock 2014 Limited | Real estate | 2014 |
| College Homes Management (Wharf ST) Limited | Households | 2014 |
| College Planning & Property Services Limited | Administrative & support | 2016 |
| Colliers of Birmingham Limited | Extraterritorial | 1969 |
| Colliers of Sutton Coldfield Limited | Extraterritorial | 1986 |
| Colliers Pension Trustees Limited | Professional & scientific | 2010 |
| Columbus Securities | Administrative & support | 1965 |
| Colusha One Ltd | Real estate | 2025 |
| COM Design Ltd | Information & communication | 2025 |
| COM Group Telecom Ltd | Information & communication | 2023 |
| COM Rigging Ltd | Information & communication | 2025 |
| Comdudes Technologies Ltd | Extraterritorial | 2022 |
| Comec Voice & Data Limited | Wholesale & retail | 1992 |
| Comex Consultants Ltd | Information & communication | 2024 |
| Community Models Ltd | Professional & scientific | 2013 |
| Comp Consulting Ltd | Professional & scientific | 2024 |
| Compass Services Management Limited | Professional & scientific | 2024 |
| Compassion First Home Care Ltd | Health & social care | 2023 |
| Complete Credit Consultancy Limited | Financial services | 2007 |
| Completechiro Ltd | Health & social care | 2021 |
| Compoost Toilets Ltd | Manufacturing | 2019 |
| Compton Parker Associates Limited | Professional & scientific | 2006 |
| Compulab Limited | Information & communication | 1997 |
| Conceptual Systems Limited | Information & communication | 2010 |
| Conrugis Limited | Professional & scientific | 2021 |
| Conscience Awake Ltd | Information & communication | 2018 |
| Consortia Marketing Limited | Wholesale & retail | 2008 |
| Constructing Systems Limited | Construction | 2016 |
| Consultingsim Limited | Education | 2021 |
| Contact Electrical Installations Limited | Construction | 2016 |
| Conway Stewart Limited | Manufacturing | 2026 |
| Coombefield Plantation Limited | Agriculture & fishing | 2014 |
| Copernicana C.I.C. | Other services | 2018 |
| Corby Associates Ltd | Administrative & support | 2018 |
| Core Kitchen Catering Ltd | Hospitality | 2018 |
| Corless Associates Limited | Financial services | 2014 |
| Cormoran Medical Ltd | Health & social care | 2025 |
| Cornwall Developments (St.A) Limited | Construction | 2025 |
| Corset Couture Limited | Wholesale & retail | 2025 |
| Cosyback Limited | Wholesale & retail | 2017 |
| Coterie Supply Chain Management Limited | Professional & scientific | 2016 |
| Cotswold Destinations Limited | Hospitality | 2014 |
| Cotswold Fencing and Landscaping Limited | Agriculture & fishing | 2022 |
| Cotswold Foodstore and Cafe Limited | Wholesale & retail | 2018 |
| Cotswold Fridge Hire Ltd | Administrative & support | 2024 |
| Cotswold Herbs Ltd | Agriculture & fishing | 2010 |
| Cotswold Heritage Limited | Manufacturing | 2007 |
| Cotswold Power Limited | Professional & scientific | 2014 |
| Cotswold Surveying Services Limited | Professional & scientific | 2013 |
| Cotswolds Counselling Ltd | Health & social care | 2025 |
| Cotswolds Equine Assisted Therapy and Learning CIC | Health & social care | 2023 |
| Cottage Consulting Ltd | Information & communication | 2019 |
| Cottage Farm Stables Limited | Arts & recreation | 2012 |
| Country Auctions Ltd | Wholesale & retail | 2013 |
| Country Life Furniture (Stratford) Limited | Wholesale & retail | 2018 |
| Country Life Pest Control Limited | Administrative & support | 2017 |
| Courageous Success Holdings Limited | Administrative & support | 2013 |
| Courtyard Phase 2 Coleshill Limited | Real estate | 2020 |
| Couvs Ltd | Wholesale & retail | 2026 |
| Coventry Airport Holdings Limited | Financial services | 2010 |
| Coventry Central Chiropractic Clinic Limited | Health & social care | 2016 |
| CPT Associates Ltd | Professional & scientific | 2025 |
| CR Industries Ltd | Financial services | 2018 |
| Crabis Limited | Information & communication | 2016 |
| Crafted Resolutions Limited | Professional & scientific | 2024 |
| Craftmasters Property Services Limited | Construction | 2008 |
| Craig Clark Search Ltd | Administrative & support | 2022 |
| Craven & White Limited | Manufacturing | 2024 |
| Crawneale Capital Ltd | Real estate | 2024 |
| Crean Consultancy Ltd | Professional & scientific | 2016 |
| Creating Future Possibilities Ltd | Professional & scientific | 2004 |
| Creative Vectors Ltd | Professional & scientific | 2016 |
| Creaton Group Limited | Wholesale & retail | 2017 |
| Cribs Residential Lettings Ltd | Real estate | 2020 |
| Crisps Farm Limited | Other services | 1975 |
| Crmi Ltd | Wholesale & retail | 2018 |
| Croeso Developments Limited | Real estate | 2012 |
| Croft Property Development Limited | Construction | 2003 |
| Croft Wilson Holdings Limited | Manufacturing | 2011 |
| Croftstone Management Limited | Administrative & support | 2010 |
| Cross Border Holdings Ltd | Financial services | 2024 |
| Cross Roads Garage(Tredington)Limited | Wholesale & retail | 1958 |
| Crossfire Group Limited | Public administration | 2019 |
| Crown Club Points Limited | Other services | 2019 |
| Crownpoint Properties Limited | Real estate | 2002 |
| Crumb Umbrella Limited | Professional & scientific | 2017 |
| Cruz Vehicle Engineering Ltd | Wholesale & retail | 2023 |
| CSR Publishings Ltd | Information & communication | 2026 |
| Csrm Outsourcing Limited | Administrative & support | 2007 |
| CUE Point Technology Limited | Administrative & support | 2021 |
| Culinarians Limited | Hospitality | 2013 |
| Cupboard Love Design Ltd | Manufacturing | 2012 |
| Cursed Competitions Limited | Arts & recreation | 2022 |
| Customer Journey Studio Ltd | Information & communication | 2025 |