| C. S. Abell Electrical Services Limited | Construction | 2011 |
| C. W. Fasteners Limited | Wholesale & retail | 2006 |
| C.E.Walton & Co.Limited | Water & waste | 1965 |
| C.H.Taylor & Co.,Limited | Real estate | 1924 |
| C.J. Engineering (Toolmakers) Limited | Professional & scientific | 1972 |
| C.O.P Utility Ltd | Construction | 2025 |
| C.P.E. (Holdings) Limited | Administrative & support | 2018 |
| C.R.S. Engineering Consultants Ltd | Construction | 1999 |
| C.T.S. (Properties) Limited | Real estate | 1990 |
| C.Wylie & SON Limited | Agriculture & fishing | 1958 |
| C2E Solutions Ltd | Professional & scientific | 2025 |
| C7 Bullion Limited | Wholesale & retail | 2019 |
| CA Canny Consulting Ltd | Administrative & support | 2019 |
| CA Total Consulting Ltd | Administrative & support | 2012 |
| Cabella Commercial Tiling Ltd | Professional & scientific | 2015 |
| Cafe Castle Ltd | Hospitality | 2026 |
| Cake-A-Licious Delights Ltd | Manufacturing | 2024 |
| CAL Build Limited | Construction | 2022 |
| Calatherm Limited | Manufacturing | 1996 |
| Cali Autoworks Limited | Wholesale & retail | 2026 |
| Calicleans Limited | Wholesale & retail | 2024 |
| Calico Business Park Management Company Limited | Households | 2008 |
| Calico Healthcare Limited | Health & social care | 2023 |
| Callahan's Castles & Occasions Ltd | Administrative & support | 2021 |
| Calo Design Ltd | Information & communication | 2023 |
| Caltrac Floors Limited | Construction | 2003 |
| Calvin Holdings Limited | Financial services | 2023 |
| CAM Spedition Ltd | Transport & logistics | 2017 |
| Camsellutions Limited | Professional & scientific | 2018 |
| Canine Connection Ltd | Other services | 2014 |
| Cantoo Limited | Arts & recreation | 2005 |
| Canwell Services Ltd | Wholesale & retail | 2025 |
| Capsicum Properties Limited | Real estate | 2002 |
| Cardcert Ltd | Wholesale & retail | 2025 |
| Care Building & Maintenance Limited | Construction | 2025 |
| Care Plan Ltd | Health & social care | 2026 |
| Career and Education Ltd | Education | 2024 |
| Cargo Marketing Services Limited | Transport & logistics | 1979 |
| Cariad Education Limited | Administrative & support | 2025 |
| Carl Ford & Associates Limited | Professional & scientific | 2018 |
| Carlos & Lucia Developments Limited | Real estate | 2021 |
| Carlos Coaching Services Limited | Education | 2018 |
| Carlsharon Communications Limited | Information & communication | 2022 |
| Carnbrea Properties Limited | Real estate | 1996 |
| Carpenter Surveyors Burbage Ltd | Administrative & support | 2023 |
| Carpenter Surveyors Coventry Ltd | Administrative & support | 2021 |
| Carpenter Surveyors Limited | Professional & scientific | 2008 |
| Carpenter Surveyors Market Harborough Ltd | Administrative & support | 2019 |
| Carpenter Surveyors Moseley Ltd | Administrative & support | 2025 |
| Carpenter Surveyors North Ltd | Administrative & support | 2024 |
| Carpenter Surveyors Stratford Upon Avon Ltd | Administrative & support | 2023 |
| Carpenter Surveyors Three Counties & Cotswolds Ltd | Administrative & support | 2023 |
| Carpenters Surveyors Birmingham Limited | Administrative & support | 2012 |
| Carpenters Surveyors South Birmingham Limited | Administrative & support | 2008 |
| Carpenters Surveyors West Birmingham Ltd | Administrative & support | 2017 |
| Carpet Centre (Tamworth) Ltd | Wholesale & retail | 2009 |
| Carpet Doctor UK Limited | Other services | 2009 |
| CARS4U (Tamworth) Ltd | Wholesale & retail | 2025 |
| Cartam Limited | Wholesale & retail | 2018 |
| Carters Photography Ltd | Professional & scientific | 2022 |
| Cartmell General Engineering Ltd | Professional & scientific | 2025 |
| Carturntables Limited | Extraterritorial | 2006 |
| Carus Consultancy Services Limited | Professional & scientific | 2026 |
| Casa Developers Limited | Real estate | 2018 |
| Casa Padel Group Limited | Arts & recreation | 2026 |
| Cash FLO Recruitment Finance Limited | Administrative & support | 2023 |
| Cash FLO Solutions Limited | Administrative & support | 2018 |
| CASH48 Ltd | Arts & recreation | 2023 |
| Cashelbay Homes Ltd | Financial services | 2023 |
| Cass (Legal Cashiering) Ltd | Professional & scientific | 2026 |
| Cast & FIX Property Services Ltd | Construction | 2026 |
| Castle Bespoke Vehicles Limited | Administrative & support | 2019 |
| Castle Bromwich Trade Park Management Co Ltd | Real estate | 2021 |
| Castle Cases Ltd | Manufacturing | 2011 |
| Castle Hotel (Tamworth) Ltd | Hospitality | 2026 |
| Castle Hotel Tamworth Ltd | Hospitality | 2025 |
| Castle Sports Lounge Ltd | Arts & recreation | 2024 |
| Castle Strength & Conditioning Ltd | Arts & recreation | 2016 |
| Castle Tynings Limited | Real estate | 1994 |
| Caswell Gaming Solutions Limited | Professional & scientific | 2024 |
| Cata Holdings Ltd | Financial services | 2026 |
| Cata Properties Ltd | Real estate | 2026 |
| Catering Equipment Limited | Hospitality | 1996 |
| Caterly Limited | Hospitality | 2021 |
| Cathedral 300 Limited | Professional & scientific | 2017 |
| Cathedral Commercial Developments Limited | Real estate | 2011 |
| Cathedral Hygiene Limited | Professional & scientific | 1993 |
| Cathedral Interiors Limited | Construction | 2018 |
| Cathedral Kitchens Limited | Professional & scientific | 2005 |
| Cathedral Leasing Holdings Limited | Financial services | 2011 |
| Cathedral Leasing Limited | Administrative & support | 1981 |
| Cathedral Property Limited | Professional & scientific | 2015 |
| Cathedral Property Partnership Ltd | Real estate | 2009 |
| Cathedral Walk (Freehold) Limited | Real estate | 2009 |
| Cathedral Walk (RTM) Management Company Ltd | Households | 2010 |
| Catherine Culligan Limited | Information & communication | 2007 |
| Catherine Farrugia OT Consultancy Ltd | Health & social care | 2025 |
| Catsclean Services Ltd | Administrative & support | 2026 |
| Cause Communications Ltd | Professional & scientific | 2017 |
| Cawley Automotive Ltd | Wholesale & retail | 2026 |