| 'Owdyado Theatre CIC | Arts & recreation | 2015 |
| 01115163 Limited | | 1973 |
| 2020 Property Developments Limited | Construction | 2007 |
| 2M Fitness Ltd | Health & social care | 2025 |
| 2M Wellness Limited | Health & social care | 2020 |
| 31 Broad Street Properties Ltd | Construction | 2019 |
| 3SIC Ltd | Water & waste | 2019 |
| 463553 Limited | Extraterritorial | 2025 |
| 4TEL Communications Limited | Information & communication | 2002 |
| 4TEL Group Limited | Financial services | 2023 |
| 8VISION Consultancy Ltd | Information & communication | 2023 |
| 99P Films C.I.C. | Hospitality | 2023 |
| A Fresh Idea Ltd | Professional & scientific | 2017 |
| A&P Holdings Ltd | Real estate | 2015 |
| A.J. Ferguson and Company (Timber) Limited | Wholesale & retail | 1967 |
| A.T. Mile Smile Limited | Health & social care | 2023 |
| AAA Holdco Ltd | Professional & scientific | 2015 |
| AAB Holdings (Cornwall) Ltd | Financial services | 2026 |
| AC Simply Wellbeing Ltd | Other services | 2023 |
| Ace Cars (ST Ives) Ltd | Transport & logistics | 2005 |
| Adamo Group Limited | Real estate | 2018 |
| ADM Mabe Services Limited | Professional & scientific | 2025 |
| Adventures in Hospitality Ltd | Hospitality | 2018 |
| Affinity Skateboarding CIC | Arts & recreation | 2026 |
| Airblade Dynamics Ltd | Manufacturing | 2017 |
| Aj's Fish and Chips Ltd | Hospitality | 2018 |
| AJB Green Limited | Agriculture & fishing | 2017 |
| Ajjs Development Ltd | Construction | 2010 |
| Alan R J Wilson Ltd | Health & social care | 2014 |
| Albany Appointments Limited | Administrative & support | 2019 |
| Albion Textile Atelier Ltd | Wholesale & retail | 2019 |
| Alex Jupe Motorsport Limited | Wholesale & retail | 2012 |
| Alexander Build Ltd | Construction | 2012 |
| Alfa Company Investments Limited | Financial services | 2013 |
| ALL Things Cornwall Ltd | Wholesale & retail | 2024 |
| Along Came Polly Limited | Other services | 2015 |
| Alpha Microbars Ltd | Hospitality | 2019 |
| Alverton Court Developments Limited | Real estate | 2003 |
| Alverton Management Limited | Households | 2005 |
| Amanda K Limited | Professional & scientific | 2012 |
| Amazon Films Ltd | Information & communication | 2018 |
| AMS Fulfilment Limited | Transport & logistics | 2018 |
| Amutri Ltd | Information & communication | 2021 |
| AN MOR Ltd | Manufacturing | 2025 |
| An&La Ltd | Wholesale & retail | 2018 |
| Anchor Warehouse Management Company Limited | Households | 2002 |
| AND Studios Ltd | Real estate | 2019 |
| And.Gb Ltd | Professional & scientific | 2007 |
| Andrew Fowler Media Limited | Information & communication | 2012 |
| Anglo Special Products Limited | Wholesale & retail | 2015 |
| Ania.Facefitness Ltd | Other services | 2024 |
| ANN Tomlinson Consultants Ltd | Administrative & support | 2004 |
| Anton Dell Limited | Professional & scientific | 2014 |
| ANY Old Vintage Ltd | Wholesale & retail | 2015 |
| Anzani Limited | Professional & scientific | 2006 |
| Apex Carpentry Contractors Limited | Construction | 2015 |
| Apex HR Ltd | Administrative & support | 2018 |
| Appletree Life Limited | Health & social care | 2018 |
| APR South West Limited | Professional & scientific | 2003 |
| Aquatic Consultancy Ltd | Professional & scientific | 2015 |
| ARC Healthcare Southwest | Health & social care | 2017 |
| Architectural Products Limited | Manufacturing | 1995 |
| Architrail Limited | Arts & recreation | 2009 |
| Aresu & Lambert-Gorwyn Ltd | Manufacturing | 2025 |
| Art EYE Creative Consultancy Limited | Arts & recreation | 2013 |
| Artemis Cervus Ltd | Arts & recreation | 2020 |
| Artgetter Limited | Arts & recreation | 2019 |
| Artmedia Capture Limited | Administrative & support | 2012 |
| Artur Properties Ltd | Real estate | 2021 |
| Arun Properties Limited | Real estate | 2005 |
| Arvor (Maenporth) Management Limited | Households | 2006 |
| Arwenack Property Services Ltd | Administrative & support | 2017 |
| Asbestos Disposal Solutions Ltd | Water & waste | 2020 |
| ASH Kernow Limited | Construction | 2025 |
| ASH Kernow QAG Limited | Construction | 2025 |
| ASH Steel Voice Over Ltd | Information & communication | 2023 |
| Assure Heating & Plumbing Ltd | Construction | 2018 |
| AT Once Taxis Limited | Transport & logistics | 2025 |
| Athelney Trust PLC | Financial services | 1994 |
| Atkin & West Ltd | Construction | 2017 |
| Atkinson Chiropractic Limited | Health & social care | 2003 |
| Aurelia Soundworks Ltd | Information & communication | 2015 |
| Autospray Body Repairs (Cornwall) Limited | Wholesale & retail | 2003 |
| AV8 Business Services Ltd | Education | 2026 |
| Avila Vara Ltd | Wholesale & retail | 2022 |
| Avitelmessus Estates Limited | Real estate | 2018 |
| B Spoke IT Solutions Limited | Information & communication | 2015 |
| Bailey's Country Store (Penryn) Limited | Wholesale & retail | 2006 |
| Baitesca Consultancy Limited | Professional & scientific | 2009 |
| Baked Sauna Ltd | Health & social care | 2025 |
| Bar Creek (Management Company) Limited | Households | 2009 |
| Barefoot Nutrition Ltd | Manufacturing | 2017 |
| Barxwise Ltd | Financial services | 2023 |
| Bawden Rocks Ltd | Wholesale & retail | 2023 |
| Be&C Ltd | Professional & scientific | 2025 |
| Beach Comber Legals Limited | Professional & scientific | 1999 |
| Beacon Coffee Limited | Hospitality | 2017 |
| Beam Homes Cornwall Ltd | Construction | 2021 |
| Bean Falmouth Limited | Wholesale & retail | 2025 |
| Beau Sala Ltd | Wholesale & retail | 2020 |