| L D Pengilly Builders Ltd | Construction | 2014 |
| L P Stephens & Sons Limited | Transport & logistics | 2012 |
| L R Hydrographics Limited | Professional & scientific | 2017 |
| L.Fern Ltd | Health & social care | 2022 |
| L.P.D Building & Plastering Limited | Construction | 2022 |
| L2I Consulting Ltd. | Professional & scientific | 2024 |
| LA Development Holdings Ltd | Construction | 2021 |
| LAB Dynamics Ltd | Professional & scientific | 2017 |
| Lacoliba Ltd | Real estate | 2023 |
| Lacuna Gardens Management Company Ltd | Households | 2026 |
| Ladye Bay Project Limited | Construction | 2025 |
| Ladywood Asset Management Limited | Real estate | 2016 |
| Lainey Lovell Photography Ltd | Professional & scientific | 2026 |
| Laity Management Limited | Real estate | 2022 |
| Lake Inns & Leisure Limited | Construction | 1996 |
| Lamaisah Properties Ltd | Real estate | 2024 |
| Lamanva Camping Ltd | Hospitality | 2021 |
| Lamanva Farm Ltd | Financial services | 2021 |
| Lamiri Group Ltd | Manufacturing | 2020 |
| Lana Aesthetics Limited | Other services | 2021 |
| Lanalana Limited | Health & social care | 2014 |
| Landarc Ltd | Professional & scientific | 2016 |
| Lander Mortgage Services Ltd | Financial services | 2013 |
| Landmark Homes (Cornwall) Limited | Construction | 2014 |
| Lands END Coffee Company Ltd | Hospitality | 2022 |
| Lane's Storage and Removals Limited | Transport & logistics | 1967 |
| Langarth Farm Limited | Agriculture & fishing | 2015 |
| Language Tree Ltd | Education | 2011 |
| Lanner Estates Limited | Other services | 1965 |
| Lanteglos Hotel & Villas (2011) Limited | Financial services | 2011 |
| Lark Consulting Limited | Professional & scientific | 2007 |
| Larry Taylor Roof Tiling and Slating Limited | Construction | 2004 |
| Last Thyme Limited | Information & communication | 2013 |
| Laurimar Limited | Real estate | 2006 |
| Lavigne Lonsdale Limited | Professional & scientific | 2006 |
| Lavis Electrical Services Limited | Construction | 2014 |
| Lavis Holdings Limited | Financial services | 2024 |
| Lawler and COE Ltd | Real estate | 2024 |
| Lawrance Bars Ltd | Hospitality | 2019 |
| Laws Properties Limited | Real estate | 2017 |
| Lawton Projects Ltd | Construction | 2026 |
| LBS (Cornwall) Limited | Professional & scientific | 2015 |
| LC Geoscience Ltd | Professional & scientific | 2019 |
| LCL Consultancy Ltd | Construction | 2024 |
| Leeline Transport Ltd | Transport & logistics | 2025 |
| Legacy Restorations (SW) Ltd | Construction | 2015 |
| Leicester Engineering Services Limited | Professional & scientific | 2017 |
| Lelissick Developments LLP | | 2005 |
| Lemon Chapel Limited | Real estate | 2011 |
| Lemon Drops Retail Ltd | Wholesale & retail | 2024 |
| Lemon Street Barber Ltd | Other services | 2018 |
| Lemon Street Lettings Limited | Real estate | 2018 |
| Leonard Symons Conservation Ltd | Construction | 2009 |
| Lerryn Homes Limited | Extraterritorial | 2024 |
| Leskinnick House RTM Limited | Households | 2015 |
| Leslie James Gilbert Limited | Extraterritorial | 2025 |
| Leven House Limited | Administrative & support | 2022 |
| Lever Ltd | Professional & scientific | 2024 |
| Lewis Christie Ltd | Construction | 2025 |
| Lewis Electrical (SW) Ltd | Construction | 2023 |
| LEY Group Ltd | Manufacturing | 2021 |
| Leyonne Energy Limited | Energy | 2012 |
| Lgdr Limited | Professional & scientific | 2013 |
| LGV Development LLP | | 2023 |
| LGV Property Holdings LLP | | 2023 |
| LHM Tech Ltd | Information & communication | 2025 |
| Liam Creed Studio Ltd | Professional & scientific | 2024 |
| Liberty Mews Residents Co. Limited | Real estate | 1986 |
| Libi Barbers Limited | Other services | 2023 |
| Librocube Limited | Financial services | 2017 |
| LID Studio Limited | Professional & scientific | 2025 |
| Liddicoat & Company Limited | Real estate | 2013 |
| Life Admin Group Ltd | Information & communication | 2026 |
| Lifestar Medical Limited | Transport & logistics | 2007 |
| Lifestar Training Limited | Education | 2023 |
| Lifestarworks Ltd | Other services | 2021 |
| Lifex Limited | Real estate | 2021 |
| Lift UP Leaders Ltd | Professional & scientific | 2020 |
| Light and Design Limited | Professional & scientific | 2003 |
| Lightbox Laser Clinic Limited | Other services | 2026 |
| Lightcore Limited | Professional & scientific | 2009 |
| Lighthouse Therapy With Claire Foley Ltd | Health & social care | 2023 |
| Lillicrap Chilcott Limited | Real estate | 2001 |
| Lilly Surveyors Ltd | Other services | 2015 |
| Limako Ltd | Wholesale & retail | 2025 |
| Lime House Yoga Limited | Hospitality | 2014 |
| Linda’S Live Stream Ltd | Information & communication | 2024 |
| Linsc Properties Limited | Real estate | 2025 |
| Lipreader Limited | Manufacturing | 2025 |
| Liskeard Health Limited | Health & social care | 2008 |
| Lister-Westlake Consultancy Services Ltd | Professional & scientific | 2022 |
| Listers Property Consultants Limited | Real estate | 2013 |
| Literature and Latte Ltd | Information & communication | 2007 |
| Little Ace Studios Ltd | Information & communication | 2026 |
| Little Eden Entertainment Limited | Administrative & support | 2022 |
| Little Explorers Cornwall Ltd | Education | 2021 |
| Little Flippers Swim Academy Ltd | Education | 2025 |
| Little FOX Education Ltd | Education | 2023 |
| Little Good Harbour Ltd | Professional & scientific | 2019 |
| Little Lambs Childcare Ltd | Health & social care | 2022 |