| Living Soils Management Ltd | Agriculture & fishing | 2022 |
| Local Roofers Ltd | Construction | 2024 |
| Lockley Contracting Ltd | Construction | 2018 |
| Lockrite Cornwall Ltd | Manufacturing | 2024 |
| Longrock Memorial Services Ltd | Manufacturing | 2025 |
| Longrock Window Company Ltd | Construction | 2013 |
| Longstone Ltd | Construction | 2015 |
| Longthroat Junction Ltd | Hospitality | 2024 |
| Loop Trading Company Ltd | Wholesale & retail | 2026 |
| Lowen Heights Developments Limited | Real estate | 2026 |
| Lowen Heights Limited | Real estate | 2021 |
| Lowen Heights Properties Holdings Ltd | Real estate | 2023 |
| Lowman Electrical Limited | Construction | 2019 |
| Lucky Nicky 88 Ltd | Transport & logistics | 2018 |
| Luxe Lift Aesthetics Ltd | Other services | 2023 |
| M Harvey & SON Ltd | Wholesale & retail | 2007 |
| M&J Consulting Ltd | Information & communication | 2025 |
| Maid 'N' INK Ltd | Wholesale & retail | 2025 |
| Maids of Melody CIC | Arts & recreation | 2018 |
| Mainbrace Property Limited | Real estate | 2023 |
| Make ME a Plan Limited | Professional & scientific | 2017 |
| Maresad Care Limited | Health & social care | 2025 |
| Marine Supply Ltd | Manufacturing | 2020 |
| Mark Harris Plumbing and Heating Limited | Construction | 2012 |
| Marstead Limited | Construction | 2000 |
| Martyn Rowe Limited | Professional & scientific | 2003 |
| Mary's Angels Ltd | Health & social care | 2026 |
| Maxell VIS Ltd | Wholesale & retail | 2016 |
| Maximise Potential Ltd | Administrative & support | 2023 |
| Mccabes Family Discounts Ltd | Wholesale & retail | 2024 |
| Medall Morgan Ventilation Services Ltd | Administrative & support | 2026 |
| Mellor Trading Limited | Extraterritorial | 2020 |
| Meor Design Ltd | Other services | 2019 |
| Meredith ROW Management Company Limited | Households | 2025 |
| MGM Foundation C.I.C. | Health & social care | 2020 |
| Michael Mudge Limited | Construction | 1972 |
| Mighty Movers & Logistics Limited | Transport & logistics | 2024 |
| Minidu Ltd | Wholesale & retail | 2026 |
| Minro Limited | Hospitality | 2025 |
| MJK Sales Limited | Information & communication | 1998 |
| MJR Group SW Ltd | Construction | 2019 |
| MK Inns Limited | Hospitality | 2016 |
| Moddey Ltd | Information & communication | 2025 |
| Modena Lifestyles Limited | Construction | 2019 |
| Monty's Machinery Ltd | Manufacturing | 2025 |
| Morco's Garage Ltd | Wholesale & retail | 2025 |
| Moredon Stores Ltd | Wholesale & retail | 2018 |
| Morgan Marketing Solutions Limited | Financial services | 2025 |
| Morva Wellness Ltd | Arts & recreation | 2026 |
| Mount Pleasant (Cornwall) Management Company Ltd | Households | 2021 |
| Movyans Skolyow Meythrin (Nursery Schools Movement) Community Interest Company | Education | 2009 |
| MPP Developments 1 Limited | Construction | 2020 |
| MPP Developments 2 Limited | Construction | 2020 |
| MPP Developments Limited | Professional & scientific | 2018 |
| MPP Group (Media & Entertainment) Limited | Construction | 2020 |
| MPP Group (Property) Limited | Construction | 2020 |
| MPP Group (Solutions) Limited | Construction | 2020 |
| MPP International Limited | Professional & scientific | 2019 |
| MPP ST Limited | Real estate | 2026 |
| MS Properties (Southwest) Ltd | Construction | 2025 |
| MSC Automotive Ltd | Wholesale & retail | 2025 |
| My Chance to Dance CIC | Education | 2023 |
| Myrgh Wynn Ltd | Wholesale & retail | 2026 |
| Nallaenvironmentalsolutions Ltd | Professional & scientific | 2025 |
| Nanotech SST Limited | Wholesale & retail | 2010 |
| Naomi Victoria Business Support Limited | Administrative & support | 2026 |
| Nationwide Executive Transfers Ltd | Transport & logistics | 2023 |
| Natp. Properties Ltd | Households | 2025 |
| Natural Essences Ltd | Wholesale & retail | 2025 |
| Nawaab Indian Cuisine Ltd | Hospitality | 2026 |
| Nawaabgrilled & Indian Cuisine Ltd | Hospitality | 2025 |
| Nawaabkitchen Limited | Hospitality | 2023 |
| NCA Vehicle Management AR Limited | Administrative & support | 2021 |
| Nextgen FS Limited | Extraterritorial | 2024 |
| Nick Lyons Ltd | Arts & recreation | 2019 |
| Nick’S Motors Cornwall Ltd | Wholesale & retail | 2025 |
| Nigel Bawden Land LLP | | 2011 |
| Nigel Bawden Projects LLP | | 2010 |
| Nigel Bawden Property LLP | | 2010 |
| NKH Holdings Limited | Real estate | 2023 |
| Noonan Construction Ltd | Construction | 2023 |
| Notorius Club Fitness Ltd | Arts & recreation | 2025 |
| NS 25 Limited | Administrative & support | 2018 |
| Oakshed Care Ltd | Health & social care | 2022 |
| Oakvale Developments (SW) Ltd | Construction | 2015 |
| Oakwood Homes Management Company Limited | Real estate | 2021 |
| October 21 Ltd | Information & communication | 2007 |
| OJM - Property Management Services Ltd | Households | 2025 |
| Oliwia Fashion Limited | Professional & scientific | 2019 |
| OM Ensemble Ltd | Arts & recreation | 2023 |
| Ondol-Heat Ltd | Wholesale & retail | 2023 |
| P J D Martin Limited | Construction | 1998 |
| P K General Store Ltd | Wholesale & retail | 2023 |
| Park Bottom Developments Limited | Construction | 2010 |
| Paul Neville Stacey Ltd | Extraterritorial | 2024 |
| Paul Stacey Ltd | Extraterritorial | 2024 |
| Peaky Binders Ltd | Wholesale & retail | 2026 |
| Pendarves Equestrian Centre Limited | Arts & recreation | 2016 |
| Pendarves Holdings Ltd | Financial services | 2025 |
| Penelopes Properties Limited | Real estate | 2016 |