| C&N Property Solutions Ltd | Real estate | 2025 |
| C.A.R. Couriers Limited | Transport & logistics | 2013 |
| C.C. Properties and Building Limited | Construction | 2017 |
| C.C.S. Central Limited | Health & social care | 2001 |
| CAL Technology & Consulting Services Ltd | Information & communication | 2025 |
| Caladum Limited | Professional & scientific | 2016 |
| Callan Plant Services Limited | Construction | 2020 |
| Cameron Transport Group Ltd | Transport & logistics | 2019 |
| Candle and Match Limited | Manufacturing | 2021 |
| Capper & Co. Ltd. | Wholesale & retail | 1925 |
| Capstarr Limited | Professional & scientific | 2024 |
| Capus Limited | Extraterritorial | 1994 |
| Car Perfection ( Bilston ) Limited | Wholesale & retail | 2019 |
| Car Perfection Carcare Limited | Wholesale & retail | 2012 |
| Car TM Ltd | Construction | 2021 |
| Carcart Ltd | Wholesale & retail | 2016 |
| Care LYF Ltd | Hospitality | 2017 |
| Caritas Health and Social Care Limited | Administrative & support | 2024 |
| Carlisle Brass Limited | Wholesale & retail | 1986 |
| Carpet Underlays UK Ltd | Wholesale & retail | 2020 |
| CAZ Logistics Limited | Transport & logistics | 2023 |
| CBR Couriers Ltd | Transport & logistics | 2025 |
| CC Auto Care Ltd | Wholesale & retail | 2019 |
| Ceildoor Products Limited | Construction | 1991 |
| Celadon Cards Ltd | Wholesale & retail | 2025 |
| Cellsafeuk Ltd | Water & waste | 2024 |
| Central K9 Supplies Ltd | Wholesale & retail | 2025 |
| Central Patternmaking Limited | Manufacturing | 1976 |
| Central Transport Limited | Transport & logistics | 2014 |
| Central Transport WV Limited | Transport & logistics | 2023 |
| CENTURY100 Investments Limited | Professional & scientific | 2021 |
| Cergus Entertainment Ltd | Arts & recreation | 2023 |
| Cergus Logistics Limited | Water & waste | 2023 |
| Certax Accounting (Bilston) Limited | Professional & scientific | 2013 |
| Certified Repair Centre Ltd. | Wholesale & retail | 2017 |
| CES Bolting Ltd | Professional & scientific | 2025 |
| CFS International Trading Ltd. | Wholesale & retail | 2018 |
| Cgykitchen Ltd | Construction | 2025 |
| Chaan Ltd | Wholesale & retail | 2023 |
| Chahal Custom Creation Ltd | Construction | 2024 |
| Chahal G Ltd | Transport & logistics | 2022 |
| Chahal Housing Limited | Real estate | 2025 |
| Chair Covers (UK) Limited | Wholesale & retail | 2011 |
| Chak CHA Naal Parontha Limited | Hospitality | 2023 |
| Chalise Ltd | Construction | 2026 |
| Chantry Square (AGG4) Ltd | Real estate | 2013 |
| Chaos Camps Ltd | Education | 2025 |
| Charleen & Muzzie UW Limited | Professional & scientific | 2019 |
| CHASE55 Limited | Agriculture & fishing | 2025 |
| CHASE550 Ltd | Health & social care | 2025 |
| Cherish Haven Property Ltd | Real estate | 2021 |
| Chilli Catering Limited | Hospitality | 2020 |
| Chillington Tool Company,Limited(The) | Extraterritorial | 1892 |
| Chioma G.1 & C0 Limited | Health & social care | 2022 |
| Chip Stop Ltd | Hospitality | 2017 |
| Chloe Freeman Limited | Other services | 2025 |
| Choice Mechanical & Electrical Installations Limited | Construction | 2017 |
| Choices Mentoring & Development C.I.C. | Arts & recreation | 2025 |
| Chokmah Ltd | Real estate | 2026 |
| Chosan Entertainment Limited | Arts & recreation | 2026 |
| Chrystal Bright Services Ltd | Administrative & support | 2024 |
| Chung Electrical and Renewables Ltd | Construction | 2025 |
| Ciao Brow Henna Limited | Wholesale & retail | 2018 |
| Citadel Autos Ltd | Wholesale & retail | 2026 |
| Citylink Shopfront and Window Limited | Construction | 2022 |
| Citywest Consultants Limited | Financial services | 1989 |
| CJ Archi Designs Ltd | Professional & scientific | 2025 |
| CKD Contracts Limited | Construction | 2025 |
| CL Business Services Ltd | Administrative & support | 2019 |
| Clack Consult Limited | Construction | 2023 |
| Claimant Advice Bureau Limited | Extraterritorial | 2020 |
| Claire Livesey Enterprises Limited | Hospitality | 2018 |
| Class 33/1 Preservation Company Limited | Arts & recreation | 1997 |
| Classic Kitchens (West Midlands) Limited | Construction | 2014 |
| Clearisk Limited | Administrative & support | 2026 |
| Cleveland City Records Limited | Information & communication | 1994 |
| Clinicare Online Limited | Administrative & support | 2019 |
| Clytha Holdings Limited | Wholesale & retail | 1990 |
| Cmbespokeuk Ltd | Manufacturing | 2024 |
| Co-Living Spaces Ltd | Real estate | 2024 |
| Coastal Liner Limited | Transport & logistics | 2001 |
| Coco Deluxe Wilenhall Ltd | Hospitality | 2025 |
| Cody's Italian Bistro Ltd | Hospitality | 2026 |
| Colossus Gym Willenhall Ltd | Arts & recreation | 2023 |
| Colter Steels Holdings Limited | Professional & scientific | 2008 |
| Colter Steels Limited | Other services | 1981 |
| Commercial Vehicle Repairs (Willenhall) Limited | Wholesale & retail | 2015 |
| Community Matters Organisation CIC | Hospitality | 2024 |
| Complete Metal Recycling Limited | Water & waste | 2014 |
| COMPLEX24 Ltd | Real estate | 2025 |
| Conachi Family Ltd | Transport & logistics | 2017 |
| Console Gaming Ltd | Arts & recreation | 2022 |
| Containers and Machinery Limited | Administrative & support | 2019 |
| Contelec Engravings Limited | Manufacturing | 1978 |
| Contract Farmers Limited | Agriculture & fishing | 2019 |
| Contrarian Trade Ltd | Wholesale & retail | 2019 |
| Cooper Coated Coil Holdings Limited | Professional & scientific | 2017 |
| Cooper Coated Coil Investments Limited | Professional & scientific | 2017 |
| Cooper Coated Coil Limited | Manufacturing | 2013 |
| Cooper Coated Coil Management Limited | Professional & scientific | 2013 |