| Kingstech Solutions Limited | Wholesale & retail | 2005 |
| Kingswood Management Company (Trewhiddle) Limited | Households | 2023 |
| Kirsty Harrison Nutrition Limited | Health & social care | 2019 |
| Kito Moore Ltd | Construction | 2019 |
| Kittiwake Labs Ltd | Information & communication | 2018 |
| KLE Homes Limited | Real estate | 2024 |
| KLM Property Solutions Ltd | Real estate | 2020 |
| KM Partners Limited | Professional & scientific | 2005 |
| Knuckles NQY Ltd | Other services | 2026 |
| Koncept Academy CIC | Arts & recreation | 2015 |
| Koochy KOO Limited | Health & social care | 2011 |
| Kook (Newquay) Limited | Hospitality | 2019 |
| Kraken Design Ltd | Information & communication | 2025 |
| KRE-8 Construction Limited | Construction | 2021 |
| Krome Clothing Limited | Wholesale & retail | 2025 |
| L F F T Limited | Financial services | 2005 |
| L&D Mayor Ltd | Wholesale & retail | 2023 |
| L&K Travel Limited | Administrative & support | 2023 |
| L&L Consultancy Ltd | Administrative & support | 2026 |
| LA Casita Newquay Ltd | Hospitality | 2025 |
| Lacefern Limited | Hospitality | 1998 |
| Lacey Property Management Limited | Real estate | 2024 |
| Lady Drive Management Company Limited | Households | 2019 |
| Lagundi Ltd | Hospitality | 2015 |
| Lamb's Sheep and Cows Limited | Hospitality | 1975 |
| Landscapes of Distinction Ltd | Administrative & support | 2012 |
| Lane's Catering Ltd | Hospitality | 2023 |
| Langleys Rocky Road Ltd | Manufacturing | 2018 |
| Lantallic Construction Limited | Construction | 2010 |
| Lantallic Holdings Limited | Financial services | 2025 |
| Lantallic Property Limited | Real estate | 2025 |
| Lantic Locations Ltd | Professional & scientific | 2024 |
| Launderme Ltd | Other services | 2023 |
| Laura Rickard Mortgages Limited | Financial services | 2021 |
| Lawrence SLY Architect Ltd | Professional & scientific | 2024 |
| Lazirá Luxe Limited | Manufacturing | 2025 |
| Lazy Coconut Leisure Ltd | Other services | 2016 |
| Ldcsy Ltd | Hospitality | 2020 |
| LDT Transfers Limited | Transport & logistics | 2023 |
| LE Crunch Company Ltd | Wholesale & retail | 2025 |
| Leadworx Supplies Limited | Construction | 2019 |
| Leafcross Limited | Hospitality | 1994 |
| Leapfrog Mountain Ltd | Education | 2016 |
| Legacy Land (SW) Limited | Real estate | 2025 |
| Legacy Liquor Limited | Wholesale & retail | 2025 |
| Legacy Pentire Green Cornwall Limited | Construction | 2017 |
| Legacy Properties (Applewood) Ltd | Construction | 2021 |
| Legacy Properties (Bude) Limited | Construction | 2024 |
| Legacy Properties (Chyvounder 2) Limited | Construction | 2021 |
| Legacy Properties (NO.1) Ltd | Construction | 2026 |
| Legacy Properties (Roselyon) Limited | Construction | 2021 |
| Legacy Properties (ST Minver) Ltd | Construction | 2026 |
| Legacy Properties (Trewhiddle) Limited | Construction | 2021 |
| Legacy Properties (Trispen) Limited | Construction | 2021 |
| Legendz Car Sales Ltd | Wholesale & retail | 2025 |
| Legendz Removals Limited | Transport & logistics | 2025 |
| Leithead and Sons Property Limited | Real estate | 2025 |
| Lemon Quay Management Company Limited | Real estate | 2005 |
| Lennox Gardens Knightsbridge Property Limited | Construction | 2020 |
| Let's Munch Ltd | Administrative & support | 2024 |
| Lets Hang Ltd | Arts & recreation | 2024 |
| LFT Newquay Ltd | Arts & recreation | 2019 |
| LG Plastering and Building Ltd | Construction | 2024 |
| LG Sports Distribution Ltd | Wholesale & retail | 2013 |
| Libéma ZOO NQ Operations Ltd | Arts & recreation | 2025 |
| Libéma ZOO NQ Real Estate Ltd | Real estate | 2025 |
| Light Colour Sound Limited | Information & communication | 2013 |
| Lighthouse Group South West Limited | Manufacturing | 2023 |
| Lighthouse View Ltd | Administrative & support | 2016 |
| Lilac Leek Ltd | Financial services | 2025 |
| Lime Cards Limited | Wholesale & retail | 2009 |
| Limitless Support Services Ltd | Public administration | 2024 |
| Lisa Patston Limited | Administrative & support | 2024 |
| Liteworx AV Ltd | Construction | 2013 |
| Little Fistral Developments Ltd | Construction | 2014 |
| Little House on the Prairie Limited | Real estate | 2020 |
| Little Kestle CIC | Agriculture & fishing | 2025 |
| Little Western Limited | Arts & recreation | 2020 |
| Lizard Marine Salvage & Exploration Ltd | Water & waste | 2021 |
| Lobb Brothers Limited | Transport & logistics | 2004 |
| Locationist Ltd | Hospitality | 2023 |
| Loli Properties Limited | Real estate | 2026 |
| Longshore Cornwall Management Company Limited | Real estate | 2021 |
| Longsleddale Outdoor Pursuits Centre (Lopc) Ltd | Hospitality | 2024 |
| Looking Beyond Limited | Information & communication | 2022 |
| Lostcafe Ltd | Hospitality | 2019 |
| Lottus Limited | Wholesale & retail | 2013 |
| Love Koffi Limited | Wholesale & retail | 2021 |
| Love of Lemons Limited | Wholesale & retail | 2021 |
| Lovell 3D Ltd | Professional & scientific | 2024 |
| Lovelocks Ltd | Hospitality | 2022 |
| Lowe View Limited | Households | 2023 |
| Lowen Property Ltd | Real estate | 2021 |
| Lowenac Hotel Limited | Hospitality | 2007 |
| Lower Larrigan House Management Company Limited | Households | 1986 |
| Lower Meadows (Management) Limited | Households | 2017 |
| LRV Developments Ltd | Construction | 2019 |
| LS & Co Group Ltd | Real estate | 2025 |
| Ltaylor Consulting Ltd | Professional & scientific | 2025 |
| Luan Labs Ltd | Professional & scientific | 2024 |