| Brittain & Co Inc Ltd | Professional & scientific | 2023 |
| Brittech Controls Europe Limited | Manufacturing | 1995 |
| Broadreach Accountancy Ltd | Professional & scientific | 2021 |
| Brook Aspire Ltd | Professional & scientific | 2023 |
| Brook Blackburn | Health & social care | 1994 |
| Brook Burnley | Health & social care | 1991 |
| Brook Cornwall | Health & social care | 1993 |
| Brook Court Development Limited | Households | 1971 |
| Brook Wirral | Health & social care | 1992 |
| Brook Young People | Health & social care | 1990 |
| Brooke Bond Limited | Administrative & support | 2021 |
| Brooklands Property Management Limited | Real estate | 2007 |
| Brooks Estates Ltd | Real estate | 2022 |
| Brooks Financial Planning Limited | Financial services | 2018 |
| Broomhill Trading Ltd | Construction | 2000 |
| Bros Watches Ltd | Wholesale & retail | 2024 |
| Brosply Ltd | Information & communication | 2021 |
| Brownfield Investments Limited | Real estate | 1974 |
| Brunel Quay NO.4 Management Company Limited | Households | 1992 |
| Brunel Quays Estate Company Limited | Real estate | 2015 |
| Brunel Quays Management Company Limited | Households | 2007 |
| Brunel Two Management Company Ltd | Households | 2016 |
| Bryntin Property Care Limited | Construction | 2017 |
| Bu-Mar Skip Hire Limited | Administrative & support | 2002 |
| Buckland Corporate Finance Limited | Real estate | 1989 |
| Budai Marketing LP | | 2017 |
| Bude Tandoori Limited | Hospitality | 2019 |
| Budock Vean Developments Limited | Construction | 2013 |
| Budock Vean Holdings Limited | Professional & scientific | 1965 |
| Budock Vean Holidays Limited | Hospitality | 2014 |
| Budock Vean Hotel Limited | Hospitality | 1931 |
| Build & Renovate (SW) Limited | Construction | 2016 |
| Build by the Sea Limited | Construction | 2019 |
| Build Solar Ltd | Professional & scientific | 2017 |
| Build the Fearless Ltd | Professional & scientific | 2024 |
| Building B Green Court Management Company Limited | Real estate | 2006 |
| Building for Humanity (Group) Community Interest Company | Construction | 2025 |
| Building Rockets Ltd | Financial services | 2021 |
| Bungula Limited | Financial services | 2017 |
| Bunnery Bakery Limited | Hospitality | 2024 |
| Burley Electrical Ltd | Construction | 2024 |
| Burncoose Minerals Limited | Financial services | 2024 |
| Business Location Services Holdings Ltd | Financial services | 2021 |
| Business Location Services Limited | Financial services | 1975 |
| Butler Traditional Wooden Boats Limited | Manufacturing | 2006 |
| Button & Clanger Ltd | Hospitality | 2022 |
| Buzzing Bugs Audio Devices Ltd | Manufacturing | 2022 |
| BV Trade Ltd | Extraterritorial | 2019 |
| BW Project Services Ltd | Real estate | 2022 |
| BW Projects and Consulting Limited | Construction | 2023 |
| Byoglow Ltd | Wholesale & retail | 2011 |
| Byrne Black Belt Academy Franchise Ltd | Arts & recreation | 2013 |
| Byrne Black Belt Academy UK LLP | | 2013 |
| Byrosanna Ltd | Administrative & support | 2021 |
| C & C Jones Ltd | Real estate | 2016 |
| C & L Developments Limited | Construction | 2026 |
| C a D Architects Limited | Professional & scientific | 2000 |
| C D Dunstan Limited | Construction | 2009 |
| C I S (UK) Ltd | Construction | 2013 |
| C J Medical Limited | Health & social care | 2000 |
| C J Morford Architectural & Design Services Limited | Professional & scientific | 2002 |
| C Johnson Carpentry and Joinery Limited | Construction | 2020 |
| C Poore and Sons Limited | Construction | 2008 |
| C Pridmore Electrical Contractors Limited | Construction | 2014 |
| C S Electrical South West Limited | Construction | 2010 |
| C Simmons Enterprises Ltd | Other services | 2014 |
| C Simmons Rentals Ltd | Construction | 2011 |
| C.A.W. (Cornwall) Limited | Manufacturing | 1987 |
| C.De LA Cuesta Limited | Health & social care | 2022 |
| C.J.W. Hotels Limited | Hospitality | 1996 |
| Cable Financial Directions Limited | Extraterritorial | 2003 |
| CAD Architecture (South West) Ltd | Professional & scientific | 2010 |
| CAD Heritage Ltd | Professional & scientific | 2022 |
| CAD Planning Ltd | Professional & scientific | 2022 |
| Cadre (South West) Ltd | Administrative & support | 2020 |
| Caerhays Minerals Limited | Financial services | 2024 |
| Caesarnorbert Limited | Professional & scientific | 2014 |
| Cafe Truro Ltd | Hospitality | 2019 |
| Cafe.Uneeka Ltd | Wholesale & retail | 2013 |
| Calcraft Consulting Limited | Professional & scientific | 2026 |
| Calenick Creek Limited | Real estate | 2022 |
| Call to the Bar Ltd | Hospitality | 2013 |
| Callestick Caravan Services Ltd | Manufacturing | 2009 |
| Callestick Caravan Storage Ltd | Other services | 2004 |
| Callestick Farm Ice Cream Limited | Manufacturing | 2006 |
| Callis a Limited | Wholesale & retail | 2018 |
| Calvis Estate Planners Ltd | Professional & scientific | 2019 |
| Camel Valley and Bodmin Moor Protection Society | Administrative & support | 2012 |
| Camelot Healing Ltd | Health & social care | 2024 |
| Camills Farm Ltd | Financial services | 2022 |
| Camoufleur LLP | | 2021 |
| Camp Kernow | Education | 2008 |
| Campbeltown Way Falmouth Management Limited | Real estate | 1997 |
| Campling Holdings Ltd | Financial services | 2026 |
| Canteen Cornwall Ltd | Hospitality | 2020 |
| Cape Building Construction Limited | Agriculture & fishing | 2015 |
| Capgo International Ltd | Wholesale & retail | 2022 |
| Captain's Apartments (Falmouth) Management Company Limited | Real estate | 2024 |
| Car Leasing Network South Limited | Administrative & support | 2025 |
| Caradon Windows Cornwall Ltd | Construction | 2019 |