| Bickland Financial Planning Ltd | Financial services | 2014 |
| Big Design Corporation Limited | Arts & recreation | 1999 |
| Big Green Adventures Ltd | Education | 2022 |
| Big Green Surf School Ltd | Extraterritorial | 2022 |
| Biomnia Limited | Professional & scientific | 2001 |
| Biovit Health Ltd | Wholesale & retail | 2016 |
| Black Sea Tattoo Ltd | Other services | 2024 |
| Blackmark Agencies Ltd | Wholesale & retail | 2014 |
| Blackstone Business Ltd | Professional & scientific | 2025 |
| Blakeway Offshore Services Ltd | Administrative & support | 2026 |
| Blameys Brand Ltd | Wholesale & retail | 2024 |
| Bliss to BE Ltd | Transport & logistics | 2024 |
| Blooms Bridal Ltd | Wholesale & retail | 2022 |
| Blue Bay Beach Properties Limited | Hospitality | 2014 |
| Blue Line Hot Tubs Ltd | Administrative & support | 2020 |
| Blue Phoenix Properties Limited | Real estate | 2019 |
| Blue Skies Ahead Accounting Ltd | Professional & scientific | 2026 |
| Blue Surf & Yoga LLP | | 2024 |
| Bluechip Hotels Limited | Hospitality | 1993 |
| Bluefish Design and Development Ltd | Information & communication | 2022 |
| Blystra Arts C.I.C. | Arts & recreation | 2017 |
| Blystra Signs Ltd | Administrative & support | 2025 |
| Boarding Pass Travel Ltd | Administrative & support | 2026 |
| Bodega 18 Limited | Hospitality | 2022 |
| Bodes Real Estate Ltd | Real estate | 2020 |
| Body Bounce Ltd | Arts & recreation | 2022 |
| Bodyboard-Holidays Ltd | Administrative & support | 2011 |
| Bold Boudoir Limited | Professional & scientific | 2026 |
| Bolingey Chapel Flats Management Company Limited | Real estate | 1987 |
| Bolingey Greenacres Ltd | Construction | 2020 |
| Bolowthas Court Management Company Ltd | Households | 2014 |
| Bond Practice Management Ltd | Administrative & support | 2025 |
| Bondi Fistral & RAI Global Ltd | Hospitality | 2020 |
| BOO Consulting Limited | Professional & scientific | 2018 |
| Boscundle Consultancy Ltd | Professional & scientific | 2012 |
| Bosheydhlann Ltd | Financial services | 2016 |
| Bost Retreats Ltd | Real estate | 2022 |
| Bottlenose Limited | Real estate | 2002 |
| Boudicca Exploration and Production Limited | Mining & quarrying | 2014 |
| Boudicca Resources Limited | Mining & quarrying | 2014 |
| BOX32 Ltd | Wholesale & retail | 2020 |
| Braefel Inn Limited | Hospitality | 2019 |
| Brannan and SON Building and Maintenance Ltd | Construction | 2024 |
| Brebe Service Limited | Transport & logistics | 2019 |
| Bremed Ltd | Wholesale & retail | 2023 |
| Breonix Ltd | Health & social care | 2025 |
| Brewkegtap Ltd | Wholesale & retail | 2020 |
| Bridges for Change CIC | Health & social care | 2025 |
| Bright Square Trading Ltd | Wholesale & retail | 2007 |
| Bristol Tattoo Convention Ltd. | Other services | 2014 |
| Broadvale Land Limited | Real estate | 2024 |
| Bromsgrove Racking Services Limited | Construction | 2018 |
| Brooks Crossley Construction Limited | Construction | 2015 |
| Bryntin Properties Ltd | Real estate | 2022 |
| Bshc Limited | Financial services | 2016 |
| Buck Becketts Fresh Shell Fish Limited | Agriculture & fishing | 2021 |
| Bude (Upton) Management Company Limited | Households | 2024 |
| Build Cornwall Ltd | Construction | 2011 |
| Buildovation Limited | Construction | 2006 |
| Burnett Interiors Limited | Construction | 2003 |
| Burnham GAS Services Ltd | Administrative & support | 2016 |
| Burnt Soul Limited | Manufacturing | 2015 |
| Business Nous Ltd. | Extraterritorial | 2014 |
| Busy Bees Contracting Limited | Construction | 2010 |
| Busy Bodies Swimming Ltd | Arts & recreation | 2023 |
| Butlers Hair Studio Ltd | Other services | 2018 |
| Butterly Development Ltd | Construction | 2022 |
| Buttery Bakes Ltd | Wholesale & retail | 2026 |
| Buzz Interactive Solutions Ltd | Information & communication | 2006 |
| C & M Catering Services Limited | Hospitality | 2019 |
| C Dearing Carpentry & Construction Limited | Construction | 2024 |
| Caat Trading Limited | Other services | 2016 |
| Cafe Lakeside Limited | Hospitality | 2015 |
| Cahv Limited | Hospitality | 2021 |
| Calco Paper Services Limited | Manufacturing | 1999 |
| Campbell Retail Consultants Limited | Professional & scientific | 2014 |
| Caniscent Limited | Manufacturing | 2025 |
| Capena Film Limited | Information & communication | 2024 |
| Capfern Limited | Real estate | 2000 |
| Capinvest (Finance) Ltd | Financial services | 2019 |
| Capinvest (Securities) Ltd | Financial services | 2018 |
| Capital Chemicals Ltd | Professional & scientific | 2024 |
| Capital Traits Limited | Information & communication | 2022 |
| Cargo&Co Limited | Wholesale & retail | 2019 |
| Carines Farm Ltd. | Agriculture & fishing | 1937 |
| Carlyon Holdings Limited | Financial services | 2001 |
| Carmen Content Collective Ltd | Professional & scientific | 2025 |
| Carnarvon Lodge Management Company Limited | Households | 2010 |
| Carneton Close Limited | Households | 1980 |
| Carter Cornish Property Limited | Real estate | 2021 |
| Carter Girls Ltd | Wholesale & retail | 2026 |
| Carter Tech Ltd | Wholesale & retail | 2017 |
| Carvynick Residential Rentals Limited | Real estate | 2025 |
| Carworgie Investments Limited | Construction | 2024 |
| Cascade Theatre Company | Other services | 2000 |
| Case Projects Ltd | Construction | 2025 |
| Caspersight Homes Ltd | Real estate | 2025 |
| Caspersight Ltd | Information & communication | 2025 |
| Catherine Crowe Limited | Professional & scientific | 2021 |
| Cave Newquay Limited | Hospitality | 2021 |