| AT PUB Company Ltd | Hospitality | 2025 |
| AT Tech Solutions Ltd | Wholesale & retail | 2026 |
| Atalaya Developments LLP | | 2007 |
| Atelo Industries Ltd | Professional & scientific | 2023 |
| Atwell Labellers Limited | Extraterritorial | 1996 |
| Atwell Self-Adhesive Labellers Limited | Extraterritorial | 1996 |
| Austell's Restaurant Ltd | Hospitality | 2012 |
| Autocare TJ Ltd | Wholesale & retail | 2025 |
| Avant Garde Homes Limited | Construction | 2021 |
| AWC Printing Ltd | Manufacturing | 2022 |
| AWC Training Ltd | Education | 2011 |
| B & H Motorcycles Limited | Wholesale & retail | 2003 |
| B' Adaptive Ltd. | Manufacturing | 2020 |
| B4E Limited | Manufacturing | 2017 |
| Baker Bespoke Landscaping Ltd | Construction | 2025 |
| Balanced Camera Systems Ltd | Information & communication | 2020 |
| Balm Heroes Care Limited | Health & social care | 2025 |
| Bandeja Consulting Limited | Professional & scientific | 2026 |
| Bann's Pharmacy Limited | Wholesale & retail | 1933 |
| Bargrove Limited | Real estate | 2018 |
| Barking Buddha Ltd | Other services | 2020 |
| Bartur Construction Ltd | Construction | 2025 |
| Base Systems South West Limited | Construction | 2017 |
| Bath Ales Limited | Extraterritorial | 2000 |
| Bath Ciders Limited | Manufacturing | 2008 |
| Bathstation Ltd | Wholesale & retail | 2023 |
| Bay Gifts Cornwall Ltd | Wholesale & retail | 2016 |
| Bayleeboo Limited | Manufacturing | 2017 |
| BBG Montgomery Ltd | Real estate | 2022 |
| BED and Basket Limited | Extraterritorial | 2016 |
| BEK Contractors Ltd | Construction | 2024 |
| Benchmark Plastering Ltd | Construction | 2017 |
| Beraton Court Management Limited | Households | 1994 |
| Bespoke Fibreglass Solutions Ltd | Manufacturing | 2025 |
| Best Dinner Limited | Hospitality | 2024 |
| Best Resale and Import Ltd | Wholesale & retail | 2023 |
| Best Takeaway Near YOU Ltd | Hospitality | 2025 |
| Bethel Garage Ltd | Wholesale & retail | 2024 |
| Bfelg UK Ltd | Other services | 2020 |
| BGE Energy Limited | Information & communication | 2026 |
| BGS Plant Ltd | Construction | 2020 |
| Birmingham Wood Box Shop Limited | Wholesale & retail | 2018 |
| Bits and Pc's ST Austell Limited | Wholesale & retail | 2014 |
| Biverb Ltd | Information & communication | 2021 |
| BJL Pollard Holdings Ltd | Financial services | 2024 |
| Black Bearing Ltd | Arts & recreation | 2024 |
| BLB Truro Ltd | Hospitality | 2025 |
| Blend Cornwall Ltd | Hospitality | 2024 |
| Blessed & Parkyn Holdings Limited | Financial services | 2021 |
| Blessed Motors Ltd | Manufacturing | 2014 |
| BLT (SW) Ltd | Transport & logistics | 2018 |
| Blue Earth Investments Limited | Financial services | 2025 |
| Bluerock Dent Limited | Health & social care | 2021 |
| Blustone Limited | Construction | 2022 |
| Bmto Massage Therapy Ltd | Other services | 2025 |
| Bob's Electrical Limited | Construction | 2017 |
| Bodyworx Studios Aesthetics, Beauty & Hair Ltd | Other services | 2024 |
| Bolghen Tree Nursery CIC | Agriculture & fishing | 2021 |
| Bond Futures Ltd | Financial services | 2021 |
| Bonney & Jarman Limited | Construction | 2004 |
| Bordam Ltd | Wholesale & retail | 2019 |
| Boswinger Hostel Ltd | Hospitality | 2024 |
| Bould Creations Ltd | Administrative & support | 2024 |
| Bould Landscapes Limited | Administrative & support | 2026 |
| Bounty Events Limited | Arts & recreation | 2003 |
| BPL Removals Ltd | Transport & logistics | 2025 |
| BR Construction (SW) Ltd | Construction | 2024 |
| Brand Division Holdings Limited | Financial services | 2018 |
| Brand Division Limited | Real estate | 2008 |
| Brand Revolution Limited | Extraterritorial | 2024 |
| Brand Revolution UK Limited | Financial services | 2025 |
| Brandon EVA Construction Limited | Construction | 2024 |
| Brilliant Social Media Limited | Professional & scientific | 2012 |
| Brindle Productions Limited | Information & communication | 2025 |
| Britz Limited | Information & communication | 2019 |
| Broder Stone Limited | Wholesale & retail | 2025 |
| Brookland Sand & Aggregates Limited | Mining & quarrying | 2009 |
| Brunel Business Park (ST Austell) Management Company Limited | Real estate | 2014 |
| Brussee Flowers Ltd | Wholesale & retail | 1999 |
| Bryte Links Limited | Wholesale & retail | 2022 |
| Bubble Trouble Ltd | Hospitality | 2025 |
| Buccaneer Boats Ltd | Manufacturing | 2009 |
| Bugle Library of Things CIC | Health & social care | 2020 |
| Building Information Modelling & Management (BIM) Ltd | Construction | 2021 |
| Bumpy's Customs Ltd | Manufacturing | 2018 |
| Bunney Building Services Limited | Construction | 2013 |
| Burtleys Limited | Professional & scientific | 2017 |
| Business Directory Limited | Professional & scientific | 2026 |
| C Best Diner Limited | Hospitality | 2016 |
| C.S Land Limited | Real estate | 2015 |
| C3CORE Ltd | Administrative & support | 2018 |
| CAB Contracting Ltd | Agriculture & fishing | 2021 |
| Cadstudios (UK) Ltd | Professional & scientific | 2006 |
| Calibre Plastering (SW) Ltd | Construction | 2023 |
| Callenick House Management Ltd | Households | 2026 |
| Camel Fish Limited | Wholesale & retail | 2005 |
| Cameo Hair & Beauty (ST Austell) Limited | Other services | 2007 |
| Car Dealer Website Ltd | Information & communication | 2011 |
| Car Guys VSS Ltd | Wholesale & retail | 2022 |
| Caraway Catering Limited | Hospitality | 2021 |