| ARM Motorsport Ltd | Wholesale & retail | 2024 |
| Art Garden Greetings Ltd | Wholesale & retail | 2024 |
| Artsmania Ltd | Administrative & support | 2007 |
| ASM South West Ltd | Wholesale & retail | 2023 |
| Aspect Build Limited | Construction | 2020 |
| Aswonvos Ltd | Information & communication | 2023 |
| AT Research and Development Ltd | Public administration | 2018 |
| Atfb Limited | Agriculture & fishing | 2008 |
| Atlantek Limited | Information & communication | 2025 |
| Atlantic Coast Associates (Redruth) Limited | Financial services | 2019 |
| Atlantic Commercials and Haulage Ltd | Transport & logistics | 2026 |
| Attollo Artisan Ltd | Manufacturing | 2026 |
| Auction House Redruth CIC | Arts & recreation | 2024 |
| Audiobricks Limited | Manufacturing | 2004 |
| Aura Skincare Ltd | Other services | 2022 |
| Autism Haven CIC | Health & social care | 2024 |
| Autodentz Cornwall Ltd | Wholesale & retail | 2022 |
| Aventur Teylu Ltd | Wholesale & retail | 2022 |
| Avian ID Limited | Agriculture & fishing | 2026 |
| AVO Plumbing & Heating Limited | Construction | 2024 |
| AW Accountants Limited | Extraterritorial | 2018 |
| AYR Court Residents Association Limited | Real estate | 1998 |
| Azook Community Interest Company | Information & communication | 2008 |
| B Fennell Builders Limited | Construction | 2017 |
| B&G Accountants LLP | | 2024 |
| Back Lane West CIC | Education | 2018 |
| Backcannon Holdings J Ltd | Information & communication | 2024 |
| Bailey Holdings Limited | Real estate | 2006 |
| Baker TOM Limited | Manufacturing | 2013 |
| Barepta Cove Management Company Limited | Households | 2010 |
| Barrett Builds Ltd | Construction | 2026 |
| Bartlett Ward Limited | Construction | 2000 |
| Bayview Court (Hayle) Management Company Limited | Households | 2010 |
| Bb's Bakery Ltd | Manufacturing | 2021 |
| BC Car Parts Limited | Wholesale & retail | 2015 |
| BEA Studio Cornwall Limited | Construction | 2026 |
| Beare & Co Lettings Limited | Real estate | 2024 |
| Beare Taverns Ltd | Hospitality | 2026 |
| Beautysugaring Limited | Wholesale & retail | 2011 |
| BEE Marine Limited | Professional & scientific | 2019 |
| Beechtree Classics Ltd | Wholesale & retail | 2021 |
| Beer Ambulance Limited | Transport & logistics | 2022 |
| Belmont Court (Cornwall) Limited | Households | 1990 |
| Belmont House (Redruth) Management Company Limited | Households | 2016 |
| Benfield Stringer Design Limited | Professional & scientific | 2012 |
| Berryman's Bakery Limited | Manufacturing | 2003 |
| Best Foot Forward(Sw) Limited | Health & social care | 2025 |
| Beth Reason Communications Ltd | Professional & scientific | 2025 |
| Better by Miles Cleaning Solutions Ltd | Administrative & support | 2022 |
| Bev-Lyn Dance Limited | Wholesale & retail | 2011 |
| Bhdc Group Limited | Professional & scientific | 2025 |
| Bill Bannister Sales & Lettings Limited | Real estate | 1988 |
| BIM21 Ltd | Professional & scientific | 2022 |
| BIO Engine Technology Limited | Transport & logistics | 2005 |
| Biomass Futures Ltd | Wholesale & retail | 2013 |
| Bishop Works Limited | Financial services | 2025 |
| Bleuhills Holdings Limited | Agriculture & fishing | 2021 |
| Block and Tackle Limited | Construction | 2004 |
| Blue Abyss Global Holdings Limited | Professional & scientific | 2014 |
| Blue Mill (Fowey) Management Company Limited | Households | 2011 |
| Blue Mill Fowey Ltd | Households | 2024 |
| Blue Stone Accountancy Ltd | Professional & scientific | 2024 |
| Blue Waters Residential Management Limited | Real estate | 2008 |
| Bluefruit Labs Ltd | Information & communication | 2024 |
| Bluefruit Limited | Information & communication | 2019 |
| Bluefruit Software Employee Ownership Trustee Limited | Professional & scientific | 2019 |
| Bluefruit Software Limited | Information & communication | 2004 |
| BOB Pepper Holdings Limited | Financial services | 2012 |
| Bodyboard HQ Ltd | Wholesale & retail | 2012 |
| Bornefit Ltd | Health & social care | 2014 |
| Boscawen Property (Management) Limited | Households | 1970 |
| Bosmeor Court (Redruth) Management Company Limited | Households | 2008 |
| Boss Buns Ltd | Hospitality | 2026 |
| Bowles House Management Company Limited | Households | 2007 |
| Boxt Electrical Ltd | Construction | 2023 |
| BP Safety Limited | Education | 2015 |
| BPT Logistics Ltd | Transport & logistics | 2019 |
| Bradley’S Playspace Ltd | Hospitality | 2025 |
| Brays & K'S Ltd | Manufacturing | 2025 |
| Bread Street Flats (Penzance) Limited | Households | 2025 |
| Brereton Sharp Limited | Professional & scientific | 2023 |
| Brian Etherington Meat Company Limited | Wholesale & retail | 1992 |
| Brian Poole Geologist Ltd | Professional & scientific | 2020 |
| Bridge House (Falmouth) Management Company Limited | Households | 2020 |
| Brightline Recruitment Ltd | Administrative & support | 2025 |
| Brik Surveyors Ltd | Real estate | 2023 |
| Briskmind Technologies Ltd | Information & communication | 2025 |
| Broad Control Limited | Professional & scientific | 2005 |
| Broadside Recovery Ltd | Transport & logistics | 2025 |
| Bryant Electrical Engineers Ltd | Energy | 2008 |
| Bryher Accountants Limited | Professional & scientific | 2015 |
| Bspk Holdings Ltd | Manufacturing | 2024 |
| BSW Scaffolding Limited | Construction | 2024 |
| Bugg Ltd | Health & social care | 2025 |
| Bumbledown Shepherds Huts Limited | Construction | 2016 |
| Burnham and Weston Energy CIC | Energy | 2017 |
| Buzz Fitness (SW) CIC | Hospitality | 2023 |
| Buzz Fitness C.I.C. | Hospitality | 2018 |
| C Lean Automotive Repairs Ltd | Wholesale & retail | 2026 |
| C Scoley Electrical Ltd | Construction | 2025 |