| Broadway Taxis (Bridgwater) Limited | Transport & logistics | 1977 |
| Brookwell Mortgages Ltd | Financial services | 2005 |
| Brown & Palmer Catering Limited | Hospitality | 2025 |
| Brown Sourcing Ltd | Real estate | 2024 |
| Brownie Bros Ltd | Manufacturing | 2024 |
| Brownlees Lettings Ltd | Real estate | 2020 |
| Browns Domestic Appliances Limited | Wholesale & retail | 2001 |
| Btct Trading Limited | Education | 2014 |
| Bubbles and Squeak South West Ltd | Hospitality | 2021 |
| Buckler Cars Limited | Professional & scientific | 2005 |
| Buckler Engineering Limited | Professional & scientific | 2005 |
| Buddy Music UK Ltd | Arts & recreation | 2019 |
| Builders Butt Limited | Wholesale & retail | 2023 |
| Building and Roofing Services Limited | Construction | 2019 |
| Building Consultancy Services (NP) Limited | Professional & scientific | 2014 |
| Building Simulation Limited | Agriculture & fishing | 1988 |
| Buildon Professional Services Limited | Construction | 2013 |
| Bumble BEE Plant Ltd | Construction | 2025 |
| Burdons Empire Ltd | Construction | 2023 |
| Burn Trading Limited | Wholesale & retail | 2025 |
| Burnham & Highbridge Taxis Limited | Transport & logistics | 2016 |
| Burnham Scaffolding Limited | Construction | 2019 |
| Burtons Ranges Ltd | Wholesale & retail | 2026 |
| Buru Shop Ltd | Wholesale & retail | 2024 |
| BUS Station Cafe (Bridgwater) Ltd | Hospitality | 2023 |
| Buscott Woodworking Ltd | Construction | 2011 |
| Business Improvement Training Limited | Education | 2017 |
| Business Management Experts Limited | Professional & scientific | 2024 |
| Busy Books (Salisbury) Ltd | Administrative & support | 2022 |
| Butterwell Farm Limited | Agriculture & fishing | 2017 |
| Bybrook Bespoke Ltd | Professional & scientific | 2023 |
| Bylldx Ltd | Information & communication | 2026 |
| C Brice Contracting Limited | Construction | 2023 |
| C L Drylining (SW) Limited | Construction | 2021 |
| C L Drylining Limited | Construction | 2016 |
| C Lynch Consulting Ltd | Professional & scientific | 2024 |
| C S Construction (SW) Ltd | Construction | 2017 |
| C W Enterprises Limited | Hospitality | 2014 |
| C&A Referbishments & Flooring Limited | Construction | 2025 |
| C&R Forestry Limited | Agriculture & fishing | 2020 |
| C&S Fitness Ltd | Arts & recreation | 2017 |
| C. & G. Janes Transport Services Limited | Transport & logistics | 1972 |
| C. Bradley Engineering Limited | Professional & scientific | 2007 |
| C.A Cosmetics & Aesthetics Ltd | Other services | 2026 |
| C.F Bricklaying Limited | Construction | 2025 |
| C.Jones Services Ltd | Construction | 2025 |
| Cabm Solutions Limited | Construction | 2018 |
| Cadbury Property Management Limited | Administrative & support | 2011 |
| Cadip Limited | Professional & scientific | 2011 |
| Cadmid Support Services Limited | Real estate | 2008 |
| Cadre Consultancy Limited | Professional & scientific | 2006 |
| Cadsure Ltd | Professional & scientific | 2019 |
| Cafe Karma Limited | Hospitality | 2021 |
| Caliber Property Solutions Limited | Real estate | 2025 |
| Calleva Holding Limited | Financial services | 2024 |
| Calleva Ingredients Limited | Other services | 2013 |
| Calleva Limited | Manufacturing | 1993 |
| Camisem Ltd | Construction | 2017 |
| Campion Advisory Ltd | Education | 2020 |
| Cannington Enterprises Limited | Agriculture & fishing | 2000 |
| Cannington Grain Services Limited | Agriculture & fishing | 1977 |
| Cannington Grange Ltd | Hospitality | 2017 |
| Cantref Adventure Farm Limited | Arts & recreation | 2012 |
| Canute Homes Ltd | Construction | 2024 |
| Capegold Care Ltd | Administrative & support | 2024 |
| Capston Limited | Professional & scientific | 2003 |
| Captivating Experiences Ltd | Administrative & support | 2020 |
| Car Mods Ltd | Wholesale & retail | 2022 |
| Caradon Construction Ltd | Construction | 2025 |
| Career Coach Southwest C.I.C. | Administrative & support | 2024 |
| Cargocraft Ltd | Wholesale & retail | 2026 |
| Caringhearts Support Services Ltd | Health & social care | 2018 |
| Carnforth Estates Limited | Real estate | 1989 |
| Carnforth Management Services Ltd. | Real estate | 1993 |
| Carnival Park Management Company Limited | Households | 2004 |
| Carnival Walk Management Company Limited | Real estate | 2002 |
| Carpco Limited | Professional & scientific | 1954 |
| Carrbuild Ltd | Construction | 2025 |
| CAS Aviation Services Limited | Manufacturing | 2006 |
| Casapu Fixing Limited | Construction | 2017 |
| Castle Apartments (Bridgwater) Limited | Households | 2011 |
| Castle Apartments, W-S-M Ltd | Households | 2013 |
| Castle Hill Quarry Co.,Limited | Mining & quarrying | 1941 |
| Castle of Comfort Limited | Hospitality | 2023 |
| Castle Offices (Bridgwater) Limited | Real estate | 1962 |
| Castle Technologies Limited | Information & communication | 1996 |
| Castlefin Ltd | Administrative & support | 2005 |
| Catc Limited | Professional & scientific | 2011 |
| Catcott Catering Management Ltd | Hospitality | 2025 |
| Catcott Garage Limited | Wholesale & retail | 1988 |
| Catering Craftsman Ltd | Manufacturing | 2025 |
| Catermek South West Ltd | Manufacturing | 2013 |
| Cathedra Property Ltd | Construction | 2023 |
| Cava Racing Ltd | Manufacturing | 2026 |
| Cavalier Way 47-50 RTM Company Limited | Households | 2025 |
| CAW Bricklaying Limited | Construction | 2024 |
| CB Haulage Somerset Ltd | Transport & logistics | 2026 |
| CEE Property Management Ltd | Real estate | 2025 |
| Cellresearch Consumer Health Ltd | Wholesale & retail | 2022 |
| Centinol Limited | Information & communication | 2017 |