| Imerys Trustees Limited | Professional & scientific | 1981 |
| Imerys UK Finance Limited | Financial services | 2011 |
| Imerys UK Limited | Professional & scientific | 1998 |
| Imerys UK Pension Fund Trustees Limited | Financial services | 1981 |
| Innovolo Ltd | Professional & scientific | 2018 |
| Insight Training & Consultancy Ltd | Education | 2019 |
| Insley Electrical Services Limited | Manufacturing | 2022 |
| International Collaboration for Hyperemesis Gravidarum Ltd | Other services | 2025 |
| Ironwood Tree Surgery Ltd | Administrative & support | 2019 |
| J Stockley Construction 1 Limited | Construction | 2025 |
| J Stockley Properties 1 Limited | Construction | 2025 |
| Janewood Developments Limited | Construction | 2009 |
| JC Masonary Contractor Limited | Construction | 2014 |
| JFM Roofing Services Ltd | Construction | 2017 |
| JJJ Services Retail Ltd | Wholesale & retail | 2023 |
| John Cornfield Limited | Information & communication | 2006 |
| Jollytasty Ltd | Hospitality | 2021 |
| Jstockleyautos Ltd | Wholesale & retail | 2026 |
| Julian & Son,Limited | Wholesale & retail | 1945 |
| Julian & Sons (Property) Limited | Real estate | 2018 |
| Julian & Sons (Topco) Limited | Financial services | 2023 |
| Just FIR LLP | | 2002 |
| K T Investments Limited | Wholesale & retail | 2003 |
| Kearn Central Properties Limited | Administrative & support | 1972 |
| Kearn Estate and Industrial (Holdings) Limited | Construction | 1970 |
| Kernow Youth CIC | Health & social care | 2015 |
| Kernowbio Ltd | Administrative & support | 2024 |
| KEW Kernow Management Company Limited | Real estate | 2025 |
| Kilhallon Agri-Food Centre CIC | Agriculture & fishing | 2019 |
| Kith Properties Ltd | Real estate | 2020 |
| KM Building and Roofing Ltd | Construction | 2018 |
| KMM Accountancy Services Ltd | Professional & scientific | 2008 |
| KP Cabs Cornwall Limited | Transport & logistics | 2012 |
| Lake View 1 Management Company Limited | Households | 2021 |
| Lake View 2 Management Company Limited | Households | 2021 |
| Larcombe's Memorials Ltd | Manufacturing | 2025 |
| Lasne Limited | Financial services | 2021 |
| Ledger Partners Limited | Professional & scientific | 2025 |
| Lieber Lighting Ltd | Extraterritorial | 2017 |
| Lightening Box Limited | Construction | 2019 |
| Lily and Belle Limited | Wholesale & retail | 2026 |
| LIZ Black Designs Ltd | Professional & scientific | 2016 |
| Lomach Ltd | Manufacturing | 2019 |
| Luxe Laundry Limited | Other services | 2021 |
| M & I Builders & Maintenance Ltd | Construction | 2012 |
| M & L Designs Limited | Construction | 2004 |
| Machine Plastering Cornwall Limited | Construction | 2007 |
| Made by the Sea Ltd | Manufacturing | 2017 |
| Marcon SES Ltd | Construction | 2017 |
| Matthews Heating Services Limited | Construction | 2017 |
| Matthews Shellfish Limited | Agriculture & fishing | 2006 |
| Maxwell H Ltd | Real estate | 2019 |
| Mdirf Trading Limited | Wholesale & retail | 1993 |
| ME Consult (UK) Limited | Professional & scientific | 2007 |
| Mike Davies Fabrication Limited | Construction | 2008 |
| MLK Developments (Cornwall) Ltd | Construction | 2024 |
| Moor-Space (PAR) Limited | Real estate | 2025 |
| Morwenna Park Ltd | Real estate | 2015 |
| Motron Ltd | Professional & scientific | 2021 |
| Mpower Kernow C.I.C. | Professional & scientific | 2020 |
| Nationwide Waterslide Services Limited | Administrative & support | 2008 |
| ND PAR Ltd | Hospitality | 2020 |
| NE Village Stores Limited | Wholesale & retail | 2020 |
| Neon Pyrotechnics Limited | Arts & recreation | 2013 |
| NP Electrical SW Ltd | Energy | 2015 |
| Nuplan Surveys Ltd | Professional & scientific | 2011 |
| Ocean Pearl (UK) Limited | Wholesale & retail | 1998 |
| OGY 1 Limited | Hospitality | 2013 |
| OMH Property Ltd | Real estate | 2024 |
| One Atlantek Ltd | Hospitality | 2021 |
| Ontrack Parcel Logistics Ltd | Transport & logistics | 2020 |
| Outboard Services & Marine Limited | Manufacturing | 2002 |
| PAR Bay Community Trust | Hospitality | 2014 |
| PAR Moor Preschool and Nursery Ltd | Education | 2012 |
| Par-Snip Eco Salon Ltd | Other services | 2021 |
| PB Elements Ltd | Construction | 2024 |
| Penk Architecture Ltd | Administrative & support | 2017 |
| Penpole Engineering Limited | Professional & scientific | 2019 |
| Pentour Construction Limited | Construction | 2017 |
| Peter D Woodley Limited | Professional & scientific | 2003 |
| PHX Imperium Ltd | Information & communication | 2023 |
| Phyllis PEA Limited | Information & communication | 2002 |
| Pierrel Champagne Occasions Ltd | Wholesale & retail | 2018 |
| Pimlico Flat Management Company Ltd | Real estate | 2019 |
| Piran Glass and Glazing Ltd | Construction | 2026 |
| Piran Windows Ltd | Wholesale & retail | 2022 |
| Piranwell Limited | Extraterritorial | 2003 |
| Plag 242 Limited | Hospitality | 2024 |
| Plasterers One Stop Shop Cornwall Limited | Wholesale & retail | 2015 |
| Porcupine Road (South Side) Limited | Households | 2019 |
| Portheras Accounting Ltd | Professional & scientific | 2022 |
| Powell-Craft (Retail) Limited | Wholesale & retail | 2003 |
| Precision Plastering (SW) Ltd | Construction | 2020 |
| Prior Technologies Ltd | Professional & scientific | 2021 |
| Productionhouse Studio Limited | Manufacturing | 2015 |
| Q Street Coffee Ltd | Other services | 2018 |
| Queens Hotel (Skegness) Limited | Hospitality | 2020 |
| Queens Hotel Group Ltd | Hospitality | 2022 |
| R-Ellis Developments Ltd | Construction | 2023 |
| Rayne Developments Limited | Construction | 2018 |