| Leanvation Worldwide Limited | Manufacturing | 2013 |
| Leap Engineering Consultancy Limited | Manufacturing | 2014 |
| Leapscheme Limited | Arts & recreation | 2021 |
| LEE Crisp Ltd | Financial services | 2021 |
| LEE Robinson Associates Limited | Administrative & support | 2003 |
| LEE Xiouris Ltd | Construction | 2011 |
| Leeming Fitness Ltd | Health & social care | 2013 |
| Legal Support Services (Ashby) Limited | Professional & scientific | 2019 |
| Leigh Brothwell Education Ltd | Education | 2021 |
| Lepus Property Limited | Real estate | 2018 |
| Leyton Road Site E15 Ltd | Real estate | 2007 |
| LH & Sons Ltd | Construction | 2009 |
| Lifescience Connect Ltd | Information & communication | 2020 |
| Light Industrial Operations Limited | Real estate | 2020 |
| Lincliff Task Ltd | Construction | 2015 |
| Linesearchbeforeudig Limited | Professional & scientific | 2011 |
| Link Business Solutions Limited | Administrative & support | 2017 |
| Link Hill Limited | Professional & scientific | 2013 |
| Linka Actuarial Services Ltd | Information & communication | 2017 |
| Linkster Recruitment Ltd | Administrative & support | 2022 |
| Little India (Ashby) Ltd | Hospitality | 2018 |
| Little Stoke Consulting Limited | Professional & scientific | 2015 |
| LIV Design Limited | Professional & scientific | 2006 |
| Livesey Brothers Limited | Agriculture & fishing | 2021 |
| Livesey Property Holdings Limited | Financial services | 2021 |
| LJW Vehicle Services and Repairs Limited | Wholesale & retail | 2025 |
| Llewys Thomas Ltd | Financial services | 2026 |
| LLM Accountancy Limited | Professional & scientific | 2020 |
| Lloyd Bennett Limited | Professional & scientific | 2010 |
| LLT Executive Search Limited | Administrative & support | 2006 |
| LMB Packing Ltd | Manufacturing | 2016 |
| LMG Events (Ashby) Limited | Administrative & support | 2015 |
| LMH Medic Limited | Administrative & support | 2017 |
| LMS Real Estate Ltd | Real estate | 2026 |
| LN Power Services Limited | Other services | 2025 |
| Lodge Close Flats (Ashby) Limited | Real estate | 1995 |
| Logic Accounting Ltd | Professional & scientific | 2014 |
| Logicom Computer Services (U.K.) Limited | Information & communication | 1986 |
| Logistical Transformation Solutions Ltd | Professional & scientific | 2022 |
| Lomas Optical Limited | Health & social care | 2003 |
| Long Eaton RFC C.I.C. | Arts & recreation | 2009 |
| Lovell (Tamworth) Limited | Real estate | 2004 |
| Lozeve Ltd | Professional & scientific | 2024 |
| LPS Marketing UK Ltd | Professional & scientific | 2024 |
| LPS Medical Supplies Limited | Manufacturing | 2020 |
| LR Roofing Limited | Construction | 2024 |
| Lucas Property Holding Limited | Real estate | 2017 |
| Lucky Nails & Spa Ltd | Other services | 2023 |
| Luluyatta Limited | Extraterritorial | 2020 |
| Lush Landscape and Garden Design Ltd | Professional & scientific | 2007 |
| LW Consultancy Services Ltd | Health & social care | 2019 |
| Lynwood Interpretation Limited | Health & social care | 2016 |
| Lynx HAY & Straw Ltd | Wholesale & retail | 2012 |
| Lyric Theatre (Ashby) Limited(The) | Real estate | 1981 |
| LZ Associates Ltd | Manufacturing | 2020 |
| M & J Parsons Limited | Administrative & support | 2015 |
| M & S Project and Consulting Ltd | Professional & scientific | 2025 |
| M D Data Solutions Ltd | Administrative & support | 2013 |
| M P Construction (Midlands) Ltd | Construction | 2013 |
| M R Property Services (South West) Limited | Administrative & support | 2010 |
| M Ryan Services Limited | Administrative & support | 2019 |
| M.Dennis Interiors Ltd | Construction | 2026 |
| M.J.Holt Limited | Manufacturing | 2016 |
| Machin's Garages Limited | Real estate | 1937 |
| Machine Alchemy Limited | Information & communication | 2020 |
| Macropulse Ltd | Information & communication | 2024 |
| Magna Distribution Limited | Transport & logistics | 2007 |
| MAID2CLEAN 120 Limited | Administrative & support | 2012 |
| Maidwell Investments Limited | Real estate | 2008 |
| Mainframe Property Management Limited | Households | 2025 |
| Maintenance & Safety Systems Ltd | Hospitality | 2021 |
| Malama Lifestyle Ltd | Wholesale & retail | 2020 |
| Manor 888 Limited | Real estate | 2024 |
| Manor ASH Limited | Education | 2011 |
| Manston Forests LLP | | 2012 |
| Manton Compressor Services Limited | Manufacturing | 1994 |
| Maple&Rose Wealth Management Ltd | Financial services | 2024 |
| Maria Ruegger Limited | Health & social care | 2012 |
| Mark Spencer Health Safety and Training Consultant Ltd | Professional & scientific | 2026 |
| Marlborough Management (Buxton) Limited | Households | 1990 |
| Martin Wyatt Joinery & Building Services Limited | Construction | 2007 |
| Mary & MEL Ltd | Professional & scientific | 2025 |
| MAS Draughting Limited | Professional & scientific | 2012 |
| Masina Ltd | Manufacturing | 2020 |
| MAT Professional Services Ltd | Professional & scientific | 2022 |
| Matthew James Homes Ltd | Administrative & support | 2019 |
| Maurice Hackenbroch & Co Limited | Professional & scientific | 2013 |
| MAY Financial Planning Ltd | Financial services | 2022 |
| May's Beauty Ltd | Other services | 2023 |
| MB Interiors (UK) Limited | Construction | 2012 |
| MBC and N Limited | Real estate | 2015 |
| MC Legacy Properties Limited | Construction | 2018 |
| MCR Shutters Limited | Wholesale & retail | 2019 |
| Measham Property and Lettings Ltd | Real estate | 2015 |
| Medical-Up Ltd | Professional & scientific | 2018 |
| Meirion House Limited | Professional & scientific | 2004 |
| Mepca Limited | Information & communication | 2017 |
| Meraki Hair Ashby Ltd | Other services | 2021 |
| Mercia Law Limited | Professional & scientific | 2011 |
| Mercia Training Ltd | Financial services | 2012 |