| Axiam Engineering Solutions Limited | Professional & scientific | 2022 |
| Axiom Lettings Limited | Real estate | 2023 |
| Axiom Property Services Limited | Real estate | 2023 |
| Axle Fashion Limited | Manufacturing | 2013 |
| AYA - Awaken Your Awareness Ltd | Health & social care | 2022 |
| AYA Healing Ltd | Health & social care | 2023 |
| AYR ST Ives Holiday Park Limited | Hospitality | 2018 |
| Azorian Trading Ltd | Hospitality | 2018 |
| Azura Restaurant and Bar Ltd | Hospitality | 2019 |
| B Graham Roofing & Guttering Ltd | Construction | 2026 |
| B T B Business to Business Limited | Real estate | 1997 |
| B T Labels Limited | Professional & scientific | 1997 |
| B. Kemp & SON Limited | Construction | 1989 |
| B. R. Johnson & Co Ltd | Wholesale & retail | 2023 |
| B.J. Press Limited | Manufacturing | 1987 |
| BA GAS (2026) Limited | Wholesale & retail | 2026 |
| Baba Gurgur Ltd | Hospitality | 2024 |
| Baba Penzance Limited | Hospitality | 2004 |
| Baby Bugs Nursery Ltd | Health & social care | 2025 |
| BACK2WORK Ltd. | Extraterritorial | 2016 |
| Bacon & Bear Limited | Financial services | 2025 |
| Badcox Consultancy Services Ltd | Professional & scientific | 2025 |
| Bank House Residents Association Limited | Households | 2016 |
| Banwell Project Limited | Construction | 2021 |
| Bar Babes Ltd | Administrative & support | 2017 |
| Bar Meadows Management Company Limited | Households | 2019 |
| Barakat Consult Ltd | Real estate | 2025 |
| Barefoot Wild Limited | Wholesale & retail | 2026 |
| Barnabus Ltd | Transport & logistics | 2025 |
| Barncoose Management Company Limited | Construction | 2006 |
| Barrie Hearn Builders Limited | Construction | 2009 |
| Barrott Investments Ltd | Real estate | 2017 |
| Barrydog Ltd | Professional & scientific | 2025 |
| Bastion Technologies LP | | 2021 |
| BAT Technologies Ltd | Professional & scientific | 2013 |
| Bathsheba Surf Ltd | Wholesale & retail | 2009 |
| Bay Tree Innovations Ltd | Households | 2023 |
| Bay Tree Restaurant (Cornwall) Limited | Hospitality | 2011 |
| Bazzof Limited | Real estate | 2024 |
| BCM Assets Ltd | Administrative & support | 2020 |
| Bdjnz Ltd | Information & communication | 2020 |
| BE Younger Cosmetics Ltd | Health & social care | 2016 |
| Beach Cafe Porthtowan Limited | Hospitality | 2024 |
| Beach Hall Flats Management Company Limited | Households | 1985 |
| Beachside Apartments Holywell Bay Management Company Limited | Households | 2013 |
| Beacon Medical Services Limited | Health & social care | 2019 |
| Beacon View Management Company (Mount Hawke) Limited | Professional & scientific | 2008 |
| Bearham Property Management Ltd | Construction | 2014 |
| Beautiful Sleep Limited | Professional & scientific | 2018 |
| Beauty @ NO. 12 Ltd | Other services | 2019 |
| Beauty Darling Limited | Wholesale & retail | 2025 |
| Beechwood Parc (Truro) Management Company Limited | Households | 2006 |
| Beetham Food Ltd | Hospitality | 2026 |
| Belaccrue Ltd | Financial services | 2026 |
| Bella Katee Pets Ltd | Manufacturing | 2021 |
| Belmont Management Services (South West) Limited | Real estate | 2007 |
| Belyars Croft Freehold Limited | Households | 2019 |
| Belyars Croft Management Limited | Real estate | 2017 |
| BEN Bromley Edits Ltd | Information & communication | 2025 |
| BEN White Architecture Limited | Professional & scientific | 2016 |
| Benbole Associates Limited | Administrative & support | 2024 |
| Benbole Management Limited | Administrative & support | 2013 |
| Bene Studio Limited | Arts & recreation | 2022 |
| Benefit Body & Mind Ltd | Other services | 2021 |
| Benefit Body & Mind UK CIC | Other services | 2023 |
| Benefit Resolutions C.I.C. | Other services | 2013 |
| Benjamin Wheeler Photography Limited | Professional & scientific | 2015 |
| Benji's and Shane's Autorepair Ltd | Wholesale & retail | 2026 |
| Bennett Surveys Ltd | Professional & scientific | 2019 |
| Bennetts Landscaping Ltd | Administrative & support | 2016 |
| Benson Developments Limited | Households | 1973 |
| Berehayes Community Management Ltd | Households | 2024 |
| Berkeley Mews Management Company Limited | Real estate | 1992 |
| Bernard Allen Consulting Limited | Professional & scientific | 2017 |
| Berrow Gardens Management Company Limited | Households | 2020 |
| Berryfive Ltd | Health & social care | 2011 |
| Bertie's Storage Company Limited | Transport & logistics | 1999 |
| Bestgymequipment Ltd | Wholesale & retail | 2011 |
| Beswethericks Ltd | Extraterritorial | 2018 |
| Better Body Training Limited | Arts & recreation | 2015 |
| Better Rent Management Ltd | Real estate | 2026 |
| Betton Consultants LLP | | 2023 |
| Betton Investments Limited | Real estate | 2002 |
| Bezant Management Company Limited | Households | 2001 |
| Bezurrel Barns Management Company Limited | Professional & scientific | 2007 |
| BFD Property Limited | Real estate | 2025 |
| BFG IT Management Limited | Information & communication | 2014 |
| BFL Studios Ltd | Construction | 2026 |
| BGM Capital Ltd | Financial services | 2026 |
| BHH Construction Limited | Construction | 2006 |
| Bhoo Ltd | Real estate | 2018 |
| Bianca Beck Consultancy Ltd | Professional & scientific | 2026 |
| Bidmac Construction Ltd | Professional & scientific | 2024 |
| Big Blue Ocean Limited | Hospitality | 2022 |
| Big Box Advertising Limited | Professional & scientific | 2017 |
| Big Box Creative Design Limited | Professional & scientific | 2020 |
| Big Igloo Limited | Wholesale & retail | 2017 |
| Big Red Audio Ltd | Manufacturing | 2018 |
| Big Sea Films Ltd | Information & communication | 2022 |
| Big Sky Farm Ltd | Hospitality | 2020 |