| Clarity Sound Therapy Ltd | Health & social care | 2025 |
| Clark Systems Limited | Administrative & support | 2022 |
| Clash Energy Services Ltd | Manufacturing | 2018 |
| Classic B & I Rugby Ltd | Arts & recreation | 2024 |
| Classic Resto Limited | Wholesale & retail | 2020 |
| Clay Chiropractic Limited | Health & social care | 2006 |
| Clayton & Jones Property Development Ltd | Real estate | 2022 |
| Clean Home With Maria Ltd | Administrative & support | 2023 |
| Clean Pristine WSM Ltd | Administrative & support | 2025 |
| Clean Vision Ltd | Administrative & support | 2024 |
| Cleanbins (Southwest) Ltd | Administrative & support | 2026 |
| Cleanify Cleaning Services Ltd | Administrative & support | 2023 |
| Cleaning & Catering Supplies Ltd | Other services | 2011 |
| Clear IT Quick Ltd | Water & waste | 2025 |
| Clear Line Studios Limited | Arts & recreation | 2023 |
| Clear Money Ltd | Professional & scientific | 2022 |
| Clear Path Support Limited | Administrative & support | 2025 |
| Clear Waterways Ltd | Other services | 2025 |
| Clearvue Developments Limited | Construction | 2020 |
| Cleeve Enterprises Ltd | Financial services | 2024 |
| Cleeve Rest Limited | Health & social care | 1988 |
| Cleeve Rest Properties Ltd | Real estate | 2022 |
| Clements Conveyancing Ltd | Professional & scientific | 2016 |
| Clements Plaice Limited | Hospitality | 2018 |
| Clerk to Governors Ltd | Education | 2018 |
| Click Spares Ltd | Transport & logistics | 2007 |
| Cliffydru Consultancy Services Ltd | Professional & scientific | 2025 |
| Clifton Development Properties Limited | Professional & scientific | 1998 |
| Clifton Estates 3 Limited | Professional & scientific | 2013 |
| Clifton Investment Properties Limited | Real estate | 1997 |
| Clifton Mansions (Maintenance) Limited | Real estate | 1986 |
| Clinical Temps Limited | Health & social care | 2020 |
| Clover Property Management Limited | Hospitality | 2014 |
| Club Freelove Ltd | Hospitality | 2019 |
| CM Engineering Services Limited | Professional & scientific | 1997 |
| CM Screeding & Under Floor Heating Limited | Construction | 2025 |
| CMA Mortgage Brokers Ltd | Financial services | 2024 |
| CMB Imports Ltd | Wholesale & retail | 2020 |
| CMS - Comfyair Limited | Administrative & support | 2006 |
| CNA Investments Ltd | Real estate | 2022 |
| Co Pack Ltd | Administrative & support | 2020 |
| Coach House (Managers) Limited | Households | 1983 |
| Coast to Coast Roofing & Building Ltd | Construction | 2025 |
| Coastal Care Services Ltd | Health & social care | 2025 |
| Coastcharm Residents Association Limited | Households | 1984 |
| Coastline Motors Limited | Wholesale & retail | 2026 |
| Cobern Building Services Ltd | Construction | 2025 |
| Coco Consultants Limited | Professional & scientific | 2015 |
| Coco Lashes by Golden Beauty Ltd | Other services | 2019 |
| Coco Love Pet Boutique Ltd | Wholesale & retail | 2025 |
| Coco's Bar Limited | Hospitality | 2025 |
| Codeq Digital Ltd | Information & communication | 2014 |
| Codpiece Productions Limited | Information & communication | 2009 |
| Cofast Limited | Manufacturing | 2026 |
| Cofast Property Management Limited | Real estate | 2026 |
| Coffee @ the Hub Limited | Hospitality | 2025 |
| Coffeejack Ltd | Wholesale & retail | 2023 |
| Cogan Scientific Limited | Professional & scientific | 2017 |
| Coggins Audio Ltd. | Manufacturing | 2018 |
| Colab Consulting Limited | Professional & scientific | 2017 |
| Coldwinter Limited | Manufacturing | 2011 |
| Coleman Construction Worle Ltd | Construction | 2023 |
| Coles Electrical Services Ltd | Manufacturing | 2015 |
| Collar Mortgage Services Limited | Financial services | 2019 |
| College Court (Burnham-On-Sea) Limited | Households | 1983 |
| Colley Vision Limited | Professional & scientific | 2012 |
| Colloquy Consulting Limited | Professional & scientific | 2014 |
| Colls Property Management Ltd | Real estate | 2024 |
| Colman & SON Limited | Wholesale & retail | 2022 |
| Colman Holdings Limited | Financial services | 2020 |
| Colman Packing Limited | Administrative & support | 2019 |
| Combe Catering Ltd | Hospitality | 2019 |
| Commercial Cashflow Limited | Financial services | 2016 |
| Commercial Finance Consultants Ltd | Financial services | 2016 |
| Commercial Hot Water Solutions Limited | Professional & scientific | 2013 |
| Common Waves CIC | Professional & scientific | 2025 |
| Community Therapeutic Services Limited | Administrative & support | 2006 |
| Complete Builders Ltd | Construction | 2023 |
| Complete Storage Systems Limited | Administrative & support | 2004 |
| Compton Mansions Management Co Ltd | Households | 2024 |
| Compton Martin Management Company Limited | Households | 2019 |
| Compufixit (South West) Ltd | Information & communication | 2015 |
| COMPUTERS365 Ltd | Information & communication | 1998 |
| Concierge International Limited | Administrative & support | 2015 |
| Conciergeuk Limited | Other services | 2014 |
| Connaught Management (Weston-Super-Mare) Limited | Households | 1990 |
| Connault Builders Limited | | 1979 |
| Conor Whelan Tutoring Ltd | Education | 2024 |
| Consort Workplace Support Ltd | Wholesale & retail | 2012 |
| Construction Engineering Limited | Construction | 2026 |
| Construction F.T Ltd | Construction | 2024 |
| Container Team (Joint Ventures) Ltd | Administrative & support | 2019 |
| Container Team Ltd | Administrative & support | 2002 |
| Continuity Financial Planning Ltd | Professional & scientific | 2022 |
| Contract Packing Ltd | Administrative & support | 2020 |
| Contractors Hub Limited | Construction | 2024 |
| Convergent Software Ltd | Information & communication | 2020 |
| Cooke & Co Lettings Limited | Real estate | 2008 |
| Cooke & Co Sales Limited | Real estate | 2008 |
| Cooke Storage Ltd | Real estate | 2026 |