| Berry Park Amenity Areas Management Company Limited | Households | 2009 |
| Bespoke Build SW Limited | Construction | 2021 |
| Big SIS C.I.C. | Education | 2020 |
| Bioflow Direct Limited | Wholesale & retail | 2002 |
| Bioflow Limited | Extraterritorial | 2017 |
| Biostatsgen Ltd | Professional & scientific | 2024 |
| Bitcruncher Media Ltd | Wholesale & retail | 2014 |
| Bitcruncher Property Ltd | Real estate | 2022 |
| Bittleford Farm Management Company Limited | Other services | 2018 |
| Bizmodeller Ltd | Information & communication | 2011 |
| Bizmodeller Properties Ltd | Real estate | 2021 |
| Black Banana Internet (Holdings) Limited | Wholesale & retail | 2014 |
| Blackline Golf Ltd | Wholesale & retail | 2026 |
| Blackwell & Co. Holdings Limited | Financial services | 2026 |
| Blackwell Bate Payroll Solutions Limited | Professional & scientific | 2020 |
| Blast From the Past Limited | Education | 2014 |
| Blend Decorating Ltd | Construction | 2008 |
| Blue Banana Projects Ltd. | Professional & scientific | 2007 |
| Blue Banana Retail Ltd. | Wholesale & retail | 1993 |
| Blue Dog Technology Ltd | Administrative & support | 2014 |
| Blue Marble Solutions Limited | Professional & scientific | 2025 |
| Blue Marine Solution Ltd | Professional & scientific | 2025 |
| Blue Monkey Developments Ltd | Construction | 2025 |
| Blueharbourhomes Ltd | Real estate | 2025 |
| Blues Exterior Cleaning Ltd | Administrative & support | 2026 |
| Blunts MOT & Service Centre Ltd | Wholesale & retail | 2023 |
| BM Automotive (SW) Ltd | Wholesale & retail | 2024 |
| BM Motors Saltash MOT Ltd | Wholesale & retail | 2021 |
| BME Software Ltd | Information & communication | 2024 |
| BNB Boost Ltd | Hospitality | 2025 |
| Boat Right Ltd. | Professional & scientific | 2003 |
| Boden-Dodd Consulting Limited | Real estate | 2017 |
| Bogata Hata Ltd | Wholesale & retail | 2025 |
| Bombshell by Beth Ltd | Other services | 2024 |
| Bond - Kernow Limited | Real estate | 2004 |
| Bond Holdings Limited | Agriculture & fishing | 1994 |
| Bonne Santé (Plymouth) Ltd | Hospitality | 2018 |
| BOS Lowen Limited | Real estate | 2025 |
| Botus Services Limited | Administrative & support | 2023 |
| Bounce Southwest Ltd | Arts & recreation | 2025 |
| Brain Based Education CIC | Education | 2025 |
| Brew & Beans Coffee Ltd | Hospitality | 2024 |
| Brimes Holdings Ltd | Financial services | 2025 |
| British Energetics Limited | Manufacturing | 1995 |
| Bruce Sweepsclean Limited | Other services | 2018 |
| Brunel Car Sales Ltd | Wholesale & retail | 2025 |
| Brunel Holdings SW Ltd | Financial services | 2021 |
| Brunel Land Holdings Limited | Real estate | 2021 |
| Brunel Quay NO.3 Management Company Limited | Households | 1992 |
| Brunel Recycling Ltd | Water & waste | 2012 |
| Bruton Building Services Ltd | Construction | 2012 |
| Bryant Investment Management Ltd | Real estate | 2023 |
| Bucca MOR Ltd | Hospitality | 2016 |
| Build UK South West Ltd | Construction | 2025 |
| Building Research in Architecture Ltd | Professional & scientific | 2020 |
| Bunkum Building Limited | Construction | 2023 |
| Buoyant Works Ltd | Manufacturing | 2010 |
| Burfoot Automotive Ltd | Wholesale & retail | 2021 |
| Businessable Ltd | Professional & scientific | 2022 |
| Butler Heating & Plumbing Limited | Construction | 2023 |
| BWG Holdings Limited | Professional & scientific | 2002 |
| C Coates Holdings Ltd | Financial services | 2024 |
| C D Cooke Car Sales Limited | Wholesale & retail | 2011 |
| C&J Complete Training Ltd | Arts & recreation | 2021 |
| Cablestop Online Limited | Wholesale & retail | 2015 |
| CAF Electrical Contractors Limited | Construction | 2023 |
| Cairncore Limited | Construction | 2011 |
| Callycombe Aggregates Limited | Mining & quarrying | 2018 |
| Cambrian Enterprises (UK) Ltd | Professional & scientific | 1999 |
| Cameron Building and Maintenance Ltd | Construction | 2019 |
| Canworthy Ltd | Wholesale & retail | 2016 |
| Caradon Physio and Wellness Centre Ltd | Health & social care | 2003 |
| Carbon Pixel Limited | Information & communication | 2012 |
| Carew Construction and Maintenance Ltd | Construction | 2021 |
| Carew Select Cars Ltd | Wholesale & retail | 2026 |
| Carn DHU Limited | Hospitality | 2020 |
| Carol Spinks Homecare Ltd | Health & social care | 2017 |
| Carol's Corner Limited | Hospitality | 2025 |
| Castlewich Estates Limited | Extraterritorial | 2008 |
| CAW Distribution Ltd | Wholesale & retail | 2024 |
| Cawkin Ltd | Hospitality | 2015 |
| CDW Property Ltd | Construction | 2014 |
| Cecil Arms Ltd | Hospitality | 2024 |
| Cedar Homes Limited | Construction | 1994 |
| Celtic Downs Management Company Limited | Households | 2002 |
| Celtic Homes Management Limited | Real estate | 2025 |
| Certini (Holdings) Limited | Financial services | 2014 |
| Certini (Holdings) NO 2 Limited | Financial services | 2021 |
| Certini Bicycle Company Limited | Wholesale & retail | 2006 |
| Certini Properties Ltd | Real estate | 2025 |
| CFD Architects Limited | Professional & scientific | 2021 |
| CGP Investments Ltd | Real estate | 2023 |
| Cgwff Ltd | Arts & recreation | 2008 |
| Chamings Limited | Construction | 2014 |
| CHD Cattle Footcare Ltd | Agriculture & fishing | 2009 |
| Chefsxpress Ltd | Administrative & support | 2012 |
| China Fleet Trust | Arts & recreation | 2009 |
| Choice Fulfilment (Services) Ltd | Administrative & support | 2013 |
| Chris Parsonage Racing Limited | Professional & scientific | 2012 |
| Christy & Moore,Limited | Information & communication | 1912 |