| 1 Percy Terrace (Plymouth) Management Company Ltd | Households | 2024 |
| 11TH Sea Ltd | Information & communication | 2020 |
| 17/19 Edgcumbe Road Management Company Limited | Households | 2016 |
| 1ST-GEAR.NET Limited | Manufacturing | 2000 |
| 2 Coves Technology Ltd. | Information & communication | 2011 |
| 2-6 Trevarthian Road Limited | Real estate | 2015 |
| 22 Clothing Ltd | Manufacturing | 2023 |
| 4TH West Limited | Professional & scientific | 2022 |
| 60 Alexandra Road Limited | Real estate | 2016 |
| 606 Distribution Ltd | Information & communication | 2018 |
| 7AM Delivery Limited | Transport & logistics | 2024 |
| 82 Alexandra RD Ltd | Real estate | 2012 |
| A & E Plumbing Ltd | Construction | 2019 |
| A & T Services Limited | Manufacturing | 1990 |
| A Bigger Boat Limited | Hospitality | 2020 |
| A J V Security Ltd Ltd | Extraterritorial | 2025 |
| A K Couriers Ltd | Transport & logistics | 2016 |
| A Little BIT of Cornwall Ltd | Wholesale & retail | 2023 |
| A R Barrier Solutions Ltd | Construction | 2025 |
| A R Barrier Systems Ltd | Manufacturing | 2025 |
| A R Mitchell & Co Limited | Professional & scientific | 2012 |
| A&M Coastal Property Maintenance Ltd | Extraterritorial | 2024 |
| A&M Small Plant (Cornwall) Limited | Wholesale & retail | 2005 |
| A.G. Marshall Limited | Construction | 1954 |
| A.J.K. GAS Services Ltd | Construction | 2020 |
| A.M.P.S. Electrical Services Limited | Construction | 2003 |
| A.R.B Signs Limited | Other services | 2018 |
| A1 Tree & Grounds Ltd | Agriculture & fishing | 2016 |
| A4A Marketing Ltd | Financial services | 2020 |
| Absolute Amusements UK Ltd | Arts & recreation | 2022 |
| AC Fabrication Cornwall Ltd | Manufacturing | 2024 |
| Access Holdings (South West) Ltd | Financial services | 2025 |
| Accexible Limited | Health & social care | 2021 |
| Acclaimed Building Services Ltd. | Construction | 2012 |
| Accountable Business Services Ltd | Professional & scientific | 2003 |
| Acorn Adventures CIC | Education | 2023 |
| Acorn Glamping Limited | Hospitality | 2021 |
| Action Heating Cornwall Ltd | Construction | 2018 |
| Activity Escapes Ltd | Arts & recreation | 2025 |
| Adamson Consultancy Services Ltd | Extraterritorial | 2014 |
| Addon Factory Limited | Information & communication | 2019 |
| ADS Total Surveying Ltd | Construction | 2025 |
| Advanced Materials Advisors Ltd | Professional & scientific | 2024 |
| Agave Landscape Limited | Administrative & support | 2011 |
| AGG Haul Limited | Transport & logistics | 2017 |
| AGH & Associates Ltd | Professional & scientific | 2022 |
| Agor Limited | Manufacturing | 2019 |
| Agri and Haulage Services Ltd | Transport & logistics | 2019 |
| Agri Facilities Limited | Financial services | 2022 |
| Aholi Trading Ltd | Wholesale & retail | 2020 |
| AI 4 Media Ltd | Other services | 2025 |
| Air Carpentry Ltd | Manufacturing | 2026 |
| Aj's Window Cleaning Ltd | Administrative & support | 2020 |
| Aladdin's Metal Craft Limited | Manufacturing | 2007 |
| Alanjonesuk Ltd | Professional & scientific | 2024 |
| Alex Jeffery Ltd | Professional & scientific | 2024 |
| ALI Property Maintenance Ltd | Real estate | 2017 |
| ALL About Frames Limited | Wholesale & retail | 2008 |
| ALL Earth Mineral Cosmetics Ltd | Wholesale & retail | 2018 |
| Allaboutyoubeautytraining Ltd | Other services | 2025 |
| Allen Martin SW Limited | Manufacturing | 2019 |
| Allshore Associates Limited | Financial services | 2017 |
| Almalux Limited | Wholesale & retail | 2024 |
| ALT Property Reality Limited | Extraterritorial | 2024 |
| Altec & Victoria Employee Trustees Limited | Professional & scientific | 2019 |
| Altec Products Limited | Financial services | 1987 |
| Altorian Limited | Hospitality | 2018 |
| Always on Mobile Limited | Information & communication | 2001 |
| ALY Swims Cornwall Ltd | Other services | 2024 |
| Amber's Sweet Cheeks Limited | Wholesale & retail | 2024 |
| Amore Aesthetics Ltd | Other services | 2025 |
| Anchor Risk Management Ltd | Professional & scientific | 2006 |
| Anchor Training Ltd | Administrative & support | 2010 |
| Anchors Coaching Limited | Health & social care | 2021 |
| Anjolu Ltd | Information & communication | 2022 |
| Anne Chapman Tax and Accounting Ltd | Professional & scientific | 2024 |
| AP & PMC Limited | Hospitality | 2016 |
| Appleton FOX Wealth Management Ltd | Financial services | 2007 |
| AQA Films Limited | Information & communication | 2000 |
| Aquavitale Ltd | Professional & scientific | 2020 |
| Arb-Sense Ltd | Administrative & support | 2015 |
| Area KA Limited | Arts & recreation | 2020 |
| Ares Plant Operator Ltd | Construction | 2021 |
| Ariea Consulting Ltd | Professional & scientific | 2024 |
| Arompi UK Limited | Wholesale & retail | 2022 |
| Arpencarpentryandconstruction Ltd | Manufacturing | 2026 |
| Artful Doodlers Limited | Arts & recreation | 2001 |
| Artistic Tiling Limited | Construction | 2018 |
| Arts 'N' Minds CIC | Education | 2025 |
| Arvor Services Ltd | Manufacturing | 2023 |
| AS Ceilings and Partitions Ltd | Construction | 2019 |
| Asgard Yachts Limited | Manufacturing | 2012 |
| Ashford Assessments Ltd | Professional & scientific | 2024 |
| Ashling House (Management) Limited | Households | 1989 |
| Askbs Limited | Construction | 2012 |
| Asmin Turner Ltd | Other services | 2025 |
| Aspire Academy Trust | Education | 2010 |
| Assembly Circuit Technology Limited | Manufacturing | 1993 |
| Assentech Rapid Response and Service Ltd | Manufacturing | 2015 |
| Assentech Sales Ltd | Wholesale & retail | 2008 |