| Livison Limited | Administrative & support | 2012 |
| LIZ Robinson Wealth Management Investment Ltd | Financial services | 2021 |
| LIZ Robinson Wealth Management Limited | Financial services | 2005 |
| LJ Garner Consultancy Limited | Professional & scientific | 2024 |
| LJE Property Enterprise Ltd | Construction | 2026 |
| LMD Brickwork Ltd | Construction | 2023 |
| LN Solutions Ltd | Professional & scientific | 2025 |
| LNM Properties Ltd | Real estate | 2016 |
| LO Cottage Ltd | Hospitality | 2021 |
| Lockjaw Tools Ltd | Wholesale & retail | 2023 |
| Locks of Love With Lindsey Ltd | Other services | 2022 |
| Lodge Vehicle Services Ltd | Wholesale & retail | 2023 |
| Logiq Design Ltd | Professional & scientific | 2020 |
| LOL Contracts Limited | Administrative & support | 2002 |
| Lolercare Ltd | Professional & scientific | 2016 |
| Long Clawson Dairy Products Limited | Manufacturing | 2019 |
| Long Clawson Medical Services Limited | Wholesale & retail | 1996 |
| Long Clawson Properties Limited | Real estate | 2019 |
| Long Clawson Village Hall and Recreation Ground | Arts & recreation | 2000 |
| Longbow Projects Limited | Administrative & support | 2019 |
| Longcliff Property Services Ltd | Households | 2020 |
| Lord and Lady Sport Ltd | Wholesale & retail | 2024 |
| Lore Collective Ltd | Professional & scientific | 2026 |
| Lorraine Michelle Copeland Limited | Professional & scientific | 2008 |
| Lotus Nail Arts Ltd | Other services | 2023 |
| Loughborough Developments Limited | Real estate | 1987 |
| Lounds Pallets (Melton) Ltd | Wholesale & retail | 2017 |
| Lowther Property Investments Ltd | Construction | 2023 |
| Loxley Oral Care Ltd | Wholesale & retail | 2026 |
| LP Distribution Ltd | Wholesale & retail | 2024 |
| Lrdc Engineering Ltd | Professional & scientific | 2023 |
| LS Education Ltd | Health & social care | 2024 |
| Lt-X Group Ltd | Professional & scientific | 2024 |
| Luca LCC Ltd | Wholesale & retail | 2022 |
| Lucas 1 Limited | Other services | 2020 |
| Lucas Fabrications Ltd | Manufacturing | 2021 |
| Lucens Psychology Services Ltd | Health & social care | 2024 |
| Lucking Estates Limited | Real estate | 2007 |
| Lumivolt Electrical Limited | Construction | 2024 |
| LUX Pinea Ltd | Manufacturing | 2025 |
| Lyddington PUB Company Limited | Hospitality | 1997 |
| Lynch P.A.D. Limited | Real estate | 2020 |
| Lynton PUB Company Ltd | Hospitality | 2025 |
| Lysander Farms Limited | Agriculture & fishing | 1981 |
| M & L Lettings Ltd | Real estate | 2017 |
| M Brown & SON Properties Limited | Real estate | 2025 |
| M K Bailey Limited | Construction | 2010 |
| M R Hall Ltd | Construction | 2011 |
| M S Contracting Ltd | Agriculture & fishing | 2006 |
| M S Home and Gift Ltd | Wholesale & retail | 2024 |
| M S Property (MSP) Ltd | Real estate | 2020 |
| M-S-F Couriers Limited | Transport & logistics | 2018 |
| M1 Services Limited | Agriculture & fishing | 2017 |
| Maher Group UK Ltd | Wholesale & retail | 2022 |
| Maines Close Limited | Households | 2025 |
| Maisie Belle's Limited | Information & communication | 2019 |
| Makbro Construction Limited | Construction | 2007 |
| Malamoon Limited | Other services | 2020 |
| MAN With FAN Ltd | Professional & scientific | 2022 |
| Manor Welding & Fabrication Ltd. | Manufacturing | 1990 |
| Mansoz Property Services Ltd | Households | 2020 |
| Manton Wood Limited | Manufacturing | 2018 |
| Manuka Life Limited | Administrative & support | 2007 |
| MAP Logistics Limited | Transport & logistics | 2010 |
| Mara Ceramics Ltd | Manufacturing | 2025 |
| Marco Polo MM Limited | Hospitality | 2024 |
| Marco Polo TA Ltd | Hospitality | 2025 |
| Marcus Owen Joinery & Property Maintenance Ltd | Construction | 2014 |
| Marcus Taylor Food Innovation and Development Solutions Ltd | Hospitality | 2015 |
| Mark Clifford & Sons (Accident Repairs) Limited | Wholesale & retail | 1993 |
| Mark Price Textiles Limited | Wholesale & retail | 2013 |
| Mark Shepherd Limited | Professional & scientific | 2011 |
| Mark Ward Dental Services Limited | Health & social care | 2016 |
| Mark Wright Mechanical Services Limited | Construction | 1997 |
| Mark Wyatt Consulting Ltd | Professional & scientific | 2021 |
| MARK1 IT Solutions Limited | Information & communication | 2013 |
| Marsden Masonry Ltd | Construction | 2021 |
| Marsters Properties Limited | Real estate | 1999 |
| Martin Paving Limited | Construction | 2021 |
| Martyn Stewart Developments Ltd | Construction | 2022 |
| MAS Supplies Limited | Wholesale & retail | 2002 |
| Mascot Powder Coating Ltd | Manufacturing | 2012 |
| Mattby Limited | Construction | 2000 |
| Mawbray Car Wash Ltd | Hospitality | 2020 |
| Mawbrook Management Ltd | Professional & scientific | 2015 |
| Maximum Athlete Development Ltd | Arts & recreation | 2024 |
| MBS Property Ltd | Real estate | 2021 |
| MC Electrical Wholesale Limited | Administrative & support | 2023 |
| Mcbaileys Ltd | Real estate | 2023 |
| Mcconnell Farms Ltd | Agriculture & fishing | 2025 |
| Mcdaid Composites Ltd | Manufacturing | 2014 |
| Mckenzie Friend Support Limited | Administrative & support | 2025 |
| Mcmullan Ltd | Real estate | 2024 |
| Mcshane Decorating Leicester Ltd | Administrative & support | 2013 |
| MD CAD Designs Limited | Professional & scientific | 2024 |
| Mechanical Design 71 Ltd | Professional & scientific | 2019 |
| Medaviate Limited | Education | 2015 |
| Medeni Ltd | Administrative & support | 2026 |
| Medicine VET Equine Referrals Limited | Professional & scientific | 2021 |
| MEDICINE4YOU Ltd | Professional & scientific | 2019 |