| Buntu Care Ltd | Health & social care | 2025 |
| Burley Securities Ltd | Financial services | 2023 |
| Burnworthy Mews (Management) Limited | Households | 2008 |
| Burrator Limited | Real estate | 2019 |
| Bushley Investments Limited | Financial services | 2022 |
| Bushy Hayes Farm (NO.3.) Limited | Real estate | 1986 |
| Bushy Hayes Farm (NO.4.) Limited | Real estate | 1986 |
| Business Butler Ltd | Administrative & support | 2018 |
| Business Lifesystem Ltd | Professional & scientific | 2012 |
| Business Services (SW) Holdings Limited | Financial services | 2024 |
| Business Services (SW) Limited | Professional & scientific | 2016 |
| Business Solutions Incorporated Ltd | Education | 2008 |
| Bussell Parts Ltd | Construction | 2013 |
| Busylizzie Art Ltd | Arts & recreation | 2013 |
| Bute Lettings Ltd | Real estate | 2024 |
| Butler & Co Solicitors Limited | Professional & scientific | 2021 |
| Butterfields Home Services Limited | Health & social care | 2013 |
| Butterhills Livestock Ltd | Agriculture & fishing | 2025 |
| Buzdugan Construction Ltd | Construction | 2020 |
| BW Beheer Limited | Professional & scientific | 2009 |
| BWP Ltd | Real estate | 2019 |
| BWW (Somerset) Limited | Water & waste | 2014 |
| BY Scent Limited | Wholesale & retail | 2023 |
| BY the Metre Limited | Wholesale & retail | 2007 |
| Byrne Upper GI Surgery Ltd | Health & social care | 2022 |
| Byron & Gomez Limited | Manufacturing | 2026 |
| Byrons Cleaning Limited | Administrative & support | 2019 |
| Bytelyfe Ltd | Information & communication | 2025 |
| C & E Jenkins Ltd | Hospitality | 2016 |
| C & H Hopwood Ltd | Health & social care | 2022 |
| C & N Properties Limited | Real estate | 2002 |
| C & W Contracting Limited | Agriculture & fishing | 2011 |
| C E Keeble Ltd | Construction | 2011 |
| C G & K D Briggs Ltd | Agriculture & fishing | 2018 |
| C J Oram Building Services Ltd | Construction | 2018 |
| C J Reah Consulting Ltd | Professional & scientific | 2023 |
| C J Smith Accountancy Ltd | Professional & scientific | 2010 |
| C L Lifestyles Ltd | Health & social care | 2010 |
| C M House Limited | Construction | 2009 |
| C Productus Energy Ltd | Administrative & support | 2010 |
| C&D James Ltd | Hospitality | 2021 |
| C&J Company Taunton Limited | Health & social care | 2018 |
| C&M Holdings Group Ltd | Financial services | 2023 |
| C.B Scaffolding Ltd | Construction | 2018 |
| C.I.C. Repair & Services Holding Ltd | Extraterritorial | 2010 |
| C.I.C. Repair & Services Holland Ltd | Extraterritorial | 2010 |
| C.I.P. Services Limited | Administrative & support | 1999 |
| C.K. Formwork Limited | Wholesale & retail | 1985 |
| C.L.A.S.S. SW Ltd | Other services | 2006 |
| C.U.There Ltd | Information & communication | 2025 |
| CA in Banat Ltd | Wholesale & retail | 2023 |
| Cabins for Gardens Limited | Wholesale & retail | 2020 |
| Cablex International UK Limited | Manufacturing | 2018 |
| Cabot Court (Taunton) Management Company Limited | Households | 2018 |
| Cadar Construction Ltd | Construction | 2023 |
| Cadbury Fields (Congresbury) Management Company Limited | Real estate | 2019 |
| Cadells Leisure Limited | Financial services | 2004 |
| Cadells Limited | Wholesale & retail | 2004 |
| Cafe Cream 20 Ltd | Hospitality | 2020 |
| Cafe Cream Limited | Wholesale & retail | 2004 |
| Cafe Dish Ltd | Hospitality | 2025 |
| Caisma Ltd | Real estate | 2020 |
| Cakes With Faces Limited | Wholesale & retail | 2021 |
| Calder Mullis Limited | Professional & scientific | 2023 |
| Calendari Property Limited | Real estate | 2017 |
| Califano Consulting Limited | Information & communication | 2014 |
| California Health Ltd | Arts & recreation | 2018 |
| Calluna Court Ltd | Real estate | 2017 |
| Calluna Enterprises Ltd | Financial services | 2011 |
| Calluna House Ltd | Financial services | 2016 |
| Calmic Software Ltd | Information & communication | 2018 |
| Calste Limited | Information & communication | 2016 |
| Calverts (Taunton) Limited | Wholesale & retail | 1940 |
| Calverts Properties (Taunton) Limited | Real estate | 2002 |
| Cambria Hydrogen Ltd | Energy | 2020 |
| Cambridge Trade Limited | Wholesale & retail | 2014 |
| Camel Hill Farm Limited | Agriculture & fishing | 2022 |
| Camelot Care (Bridgwater) Limited | Health & social care | 2013 |
| Camelot Care (Devon) Limited | Health & social care | 2024 |
| Camelot Care (Plymouth) Limited | Health & social care | 1987 |
| Camelot Care (Somerset) Limited | Health & social care | 2007 |
| Camelot Care (Yeovil) Ltd | Health & social care | 2016 |
| Camelot Care Limited | Health & social care | 2005 |
| Cameron RM Black Ltd | Financial services | 2026 |
| Camion Supplies Ltd | Professional & scientific | 1988 |
| Camorra Court Limited | Households | 2002 |
| Campbell Carpentry and Construction Ltd | Construction | 2025 |
| Campden House Dental Practice Limited | Health & social care | 2010 |
| Camper Hire Southwest Limited | Administrative & support | 2021 |
| Campermax Leisure Ltd | Wholesale & retail | 2024 |
| Campus Global Limited | Wholesale & retail | 2011 |
| Canal Court Management (Taunton) Limited | Households | 2017 |
| Canal Free House Ltd | Hospitality | 2025 |
| Candelaria Food & Drink Limited | Wholesale & retail | 2020 |
| Candletrees Farm Limited | Agriculture & fishing | 2026 |
| Candletrees Polo Limited | Agriculture & fishing | 2021 |
| Candletrees Yard Limited | Agriculture & fishing | 2023 |
| Candwr Holdings Ltd | Financial services | 2022 |
| Candyz Corner Limited | Wholesale & retail | 2026 |
| Cann Building Services Limited | Construction | 2010 |