| Launceston Health & Fitness Hub Ltd | Arts & recreation | 2023 |
| Launceston Housing Limited | Real estate | 2015 |
| Launceston Leisure Centre Limited | Arts & recreation | 2023 |
| Launceston Lettings Ltd | Real estate | 2020 |
| Launceston Liberal Club Limited | Real estate | 1897 |
| Launceston Media Limited | Information & communication | 2025 |
| Launceston Packaging Services Ltd | Manufacturing | 2010 |
| Launceston Print Ltd | Manufacturing | 2008 |
| Launceston Rugby Club Limited | Arts & recreation | 2010 |
| Launceston Spice Ltd | Hospitality | 2025 |
| Launceston Truck Service Limited | Wholesale & retail | 2011 |
| Launceston Youth Music Theatre CIC | Arts & recreation | 2023 |
| Launceston Youth Partnership Limited | Other services | 2001 |
| Launceston’S Local Ltd | Wholesale & retail | 2024 |
| Lavender Dog Limited | Hospitality | 2003 |
| LB Sign Solution Ltd | Construction | 2026 |
| LE Page Architects Limited | Professional & scientific | 2010 |
| Leo's Pizzas LLP | | 2024 |
| Leon Vanstone & Sons Limited | Wholesale & retail | 2003 |
| Levenhurst Ltd | Transport & logistics | 2003 |
| Lewis Bond (Estate Agents) Ltd. | Real estate | 1999 |
| Liberty Trails Limited | Administrative & support | 2019 |
| Life Community Media Limited | Information & communication | 2022 |
| Ling Miao Hairdressing Ltd | Wholesale & retail | 2023 |
| Little Meadow Camping (Cornwall) Ltd | Hospitality | 2024 |
| LL Entertainment Services Limited | Arts & recreation | 2014 |
| Lomax Food Processing Maintenance Limited | Manufacturing | 2003 |
| Lost Art Agency Ltd | Professional & scientific | 2023 |
| Loughborough Lettings Ltd | Real estate | 2022 |
| Lower Clubworthy Holidays Ltd | Hospitality | 2020 |
| LTS Truck and Van Ltd | Administrative & support | 2023 |
| Lucentpay Limited | Information & communication | 2025 |
| Lunaria Recruitment Limited | Administrative & support | 2017 |
| Lure Heaven Ltd | Wholesale & retail | 2010 |
| Lutra Marine Operations Ltd | Professional & scientific | 2023 |
| LUX Vault Limited | Arts & recreation | 2025 |
| Lynher Road Management Company Ltd | Real estate | 2020 |
| M & C Norton Ltd | Agriculture & fishing | 2025 |
| M & J Scaffolding Services Ltd | Construction | 2021 |
| M J Maxted Electrical Ltd | Construction | 2018 |
| M J Uglow Limited | Administrative & support | 2012 |
| M M Products Limited | Wholesale & retail | 2005 |
| M Toms Plant & Enginnering Ltd | Agriculture & fishing | 2009 |
| M&3JS Ltd | Wholesale & retail | 2019 |
| M&E Kernow Ltd | Households | 2025 |
| M&M Kneebone Building Services Ltd | Construction | 2023 |
| M&M Plant (Devon & Cornwall) Ltd | Wholesale & retail | 2006 |
| M&M Waste Plymouth Ltd | Water & waste | 2024 |
| Maade Steel & Timber Limited | Manufacturing | 2024 |
| Mack Communications Limited | Information & communication | 2025 |
| Mackenzie & Waterman Homes Ltd | Real estate | 2025 |
| Macro Access Ltd | Energy | 2022 |
| Maddielili Ltd | Professional & scientific | 2013 |
| Madhi&Shri Ltd | Wholesale & retail | 2026 |
| Maeers Consultancy Limited | Administrative & support | 2015 |
| Main's Lettings Limited | Water & waste | 2021 |
| Malooba Ltd | Information & communication | 2006 |
| Manaton Drive Management Company Limited | Households | 2011 |
| Maple Tree Joinery SW Ltd | Construction | 2026 |
| Mareth Consultant Ltd | Administrative & support | 2016 |
| Marine Bodyworkz Limited | Wholesale & retail | 2015 |
| Marlborough Insurance Services Limited | Financial services | 2003 |
| Martony Developments Ltd | Construction | 2020 |
| Matthew Crocker Steel Buildings Ltd | Manufacturing | 2015 |
| Maunder & Sons (Holdings) Ltd | Financial services | 2020 |
| Maunder and Sons (the Farmers' Stores) Limited | Wholesale & retail | 1954 |
| Mcqueen's Dance & Theatre School C.I.C. | Arts & recreation | 2016 |
| MCS Managed Construction Solutions Ltd | Professional & scientific | 2024 |
| Mdwc Ltd | Wholesale & retail | 2022 |
| Mehr Health CIC | Professional & scientific | 2026 |
| Merlion Limited | Manufacturing | 2002 |
| Merton Metals Limited | Wholesale & retail | 1994 |
| Metal & Glass Limited | Manufacturing | 2019 |
| Middletons Management Company Limited | Professional & scientific | 2007 |
| Migel SW Limited | Financial services | 2026 |
| Mila Automotive Ltd | Wholesale & retail | 2025 |
| Minster Construction and Building Services Limited | Construction | 2005 |
| MJT Combustion Services Ltd | Manufacturing | 2018 |
| ML Transport (SW) Ltd | Transport & logistics | 2015 |
| MLW Motor Services Limited | Wholesale & retail | 2013 |
| Mmxx Solutions Ltd | Manufacturing | 2019 |
| Montél Store Limited | Wholesale & retail | 2019 |
| Moon & Benney Limited | Transport & logistics | 2004 |
| Moorhill Limited | Wholesale & retail | 1995 |
| More Creative Solutions Limited | Manufacturing | 2020 |
| Move UP Limited | Real estate | 2000 |
| Mowbray Mews Management Company Limited | Households | 1990 |
| MP Customs Limited | Wholesale & retail | 2010 |
| MPA Plumbing & Heating Ltd | Construction | 2012 |
| MS Holdings (South) Limited | Financial services | 2006 |
| MTE Brickwork Ltd | Construction | 2022 |
| Mucktruck UK Limited | Manufacturing | 2004 |
| Muddytracks OFF Road Ltd | Wholesale & retail | 2026 |
| Mufasu Construction and Property Repair Services Ltd | Construction | 2022 |
| Mumtaz Care Limited | Public administration | 2015 |
| Museum of British Folklore | Administrative & support | 2009 |
| Muskoka Consulting Ltd | Professional & scientific | 2026 |
| MW Clear Ltd | Information & communication | 2024 |
| My NLP Works Limited | Administrative & support | 2017 |
| Myghterneth Ltd | Construction | 2024 |