| Loops Work Limited | Information & communication | 2026 |
| Loose Lips Ltd | Information & communication | 2020 |
| Lotus Spa Centre Limited | Health & social care | 2016 |
| Lou's Restaurant Ltd | Hospitality | 2021 |
| Loulla's Cyprus Kitchen Ltd | Wholesale & retail | 2024 |
| Love and Letters by Thea Ltd | Arts & recreation | 2026 |
| Love Enterprise Group C.I.C. | Wholesale & retail | 2017 |
| Love to Care Devon Ltd | Health & social care | 2016 |
| Love Your Life Homes Ltd | Real estate | 2024 |
| Lovely Little Pennies LLP | | 2024 |
| Lower Sanduck Farm Limited | Agriculture & fishing | 2024 |
| Lower Teign Fishing Association Limited | Agriculture & fishing | 2009 |
| Lower Woodland Barn Management Limited | Real estate | 2022 |
| LR Services South West Ltd | Wholesale & retail | 2020 |
| Lrim Holdings Limited | Real estate | 2025 |
| LS Heritage Ltd | Real estate | 2004 |
| LSS Support Services Ltd | Health & social care | 2026 |
| Luard & Shaw Productions Ltd | Information & communication | 2012 |
| Lubitec Limited | Other services | 2016 |
| Lucca Capital Ltd | Professional & scientific | 2023 |
| Luccichio Makeup Ltd | Other services | 2019 |
| Lucky Bamboo Ltd | Wholesale & retail | 2018 |
| Lucky Cat Audio Co Ltd | Information & communication | 2012 |
| Lucky Kitten Limited | Financial services | 2020 |
| Lucky Star 2025 Limited | Hospitality | 2025 |
| Luckycat Post Production Co Limited | Information & communication | 2011 |
| Lucy Clements Scientific Communications Limited | Professional & scientific | 2013 |
| Lumina Esthetica Ltd | Health & social care | 2025 |
| Luminance Media Limited | Information & communication | 2016 |
| Luna & Finch Limited | Manufacturing | 2025 |
| Luna South West Ltd | Administrative & support | 2025 |
| Lunarmill Limited | Information & communication | 2011 |
| Lundy House Management Company Limited | Households | 2004 |
| Luscombe Holdings Limited | Real estate | 2016 |
| Lustleigh Dairy Limited | Real estate | 1995 |
| Luxe Asset Global Ltd | Administrative & support | 2018 |
| Luxton Steps Ltd | Households | 2015 |
| LVA Developments Limited | Construction | 2018 |
| LVB Limited | Wholesale & retail | 2017 |
| LW HR Consultancy Limited | Administrative & support | 2016 |
| Lyme Bay Property Consultants Ltd | Professional & scientific | 2020 |
| Lynwood Fitted Furniture Limited | Construction | 2003 |
| Lyonart Ltd | Financial services | 2021 |
| LYR Music Limited | Information & communication | 2020 |
| M & C Roofing (SW) Ltd | Construction | 2013 |
| M & E Contrax Limited | Construction | 2006 |
| M & S Enterprises (Devon) Lettings Limited | Real estate | 2015 |
| M & S Enterprises (Devon) Limited | Real estate | 2009 |
| M & S Enterprises (Holdings) Limited | Professional & scientific | 2014 |
| M & W Homes Ltd | Construction | 2023 |
| M a Hayman Ltd | Other services | 2014 |
| M B Management Services (Devon) Limited | Professional & scientific | 2003 |
| M C B Property Care Limited | Wholesale & retail | 2005 |
| M G Electrical Contractors (SW) Limited | Construction | 2014 |
| M I Plant Engineering Ltd | Manufacturing | 2006 |
| M J Snow Contracting Limited | Agriculture & fishing | 2003 |
| M R Durrans Fishing Ltd | Agriculture & fishing | 2003 |
| M T Mills (Civil Contractors) Limited | Construction | 2001 |
| M5S Assets Ltd | Administrative & support | 2025 |
| M7D Ltd | Construction | 2023 |
| MAC Marine Offshore Limited | Transport & logistics | 2017 |
| Macathry UK Ltd | Wholesale & retail | 2020 |
| Mackenzie Mole Limited | Health & social care | 2019 |
| Made by Hand Events Ltd | Arts & recreation | 2013 |
| Madkitty Ltd | Wholesale & retail | 2021 |
| Maestro Ltd | Construction | 2026 |
| MAG Homes Limited | Construction | 2012 |
| MAG Rental 2 Ltd | Real estate | 2021 |
| MAG Rental 3 Ltd | Real estate | 2021 |
| MAG Rental Ltd | Real estate | 2021 |
| Magdalene Road Tenants Association Limited | Real estate | 2012 |
| Magi Aircraft Management Limited | Administrative & support | 2015 |
| Magnus Dental Practice Limited | Health & social care | 2008 |
| Magpies Gifts Limited | Wholesale & retail | 2009 |
| Mahalo 30S Investment Ltd | Real estate | 2020 |
| Mahwins Properties Limited | Construction | 2024 |
| Maid Brigade Cleaning Enterprise LLP | | 2017 |
| Maid Brigade Cleaning Enterprise SW Limited | Administrative & support | 2017 |
| MAID2CLEAN (Hampstead) Limited | Administrative & support | 2023 |
| MAID2CLEAN (ST Albans) Limited | Administrative & support | 2019 |
| MAID2CLEAN (Uxbridge) Limited | Administrative & support | 2015 |
| Maids Care C.I.C. | Health & social care | 2017 |
| Mainline Trading Limited | Administrative & support | 2007 |
| Make Development Services Ltd | Construction | 2019 |
| Make Land Uplift Ltd | Professional & scientific | 2026 |
| Makero Ltd | Wholesale & retail | 2015 |
| Makers Limited | Administrative & support | 1992 |
| Making Memories Event & Design Ltd | Other services | 2023 |
| Malcolm Snelgrove Photography Limited | Professional & scientific | 2023 |
| Maldane Limited | Administrative & support | 2003 |
| Maldena Ltd | Hospitality | 2025 |
| Malpass Media Ltd | Information & communication | 2019 |
| Mane Developments Limited | Real estate | 2014 |
| Manhawk Limited | Wholesale & retail | 2013 |
| Manley Property Developments Ltd | Real estate | 2022 |
| Manley Property Investments Ltd | Real estate | 2021 |
| Mann Eversden Ltd | Real estate | 2024 |
| Mann Farming Limited | Other services | 2002 |
| Mannings (Devon) Limited | Real estate | 1953 |
| Mannor Garage Limited | Wholesale & retail | 2010 |