| Lachesis Seed Fund Limited Partnership | | 2002 |
| Ladkin Properties Limited | Real estate | 2002 |
| Lakeside Court Management Company Limited | Households | 1993 |
| Lakh Enterprise Limited | Wholesale & retail | 2003 |
| Lakha Properties Limited | Real estate | 2005 |
| Lammitas Limited | Professional & scientific | 2003 |
| Landmark Planning Ltd | Professional & scientific | 1989 |
| Lands' END Europe Limited | Wholesale & retail | 1991 |
| Landyke Limited | Professional & scientific | 1994 |
| Larco Systems Limited | Information & communication | 1996 |
| Launde Farm Foods Limited | Hospitality | 2005 |
| Lawmac Fencing Ltd | Manufacturing | 2021 |
| Lawsons Poxon Pegg Limited | Professional & scientific | 2008 |
| LE16 Limited | Professional & scientific | 2003 |
| Leap UK Limited | Administrative & support | 2003 |
| LEE Electronics Limited | Manufacturing | 2004 |
| LEE Miller (Master Thatcher) Ltd | Construction | 2007 |
| Legalwebb UK Limited | Information & communication | 1999 |
| Leicester Electrical Centre Ltd | Wholesale & retail | 2003 |
| Leicester Empire Limited | Real estate | 2017 |
| Leicester Football Club PLC | Arts & recreation | 1997 |
| Leicester Rape Crisis Limited | Health & social care | 2002 |
| Leicester Scrap Processors & Suppliers Limited | Wholesale & retail | 1996 |
| Leicester Surveillance Limited | Manufacturing | 2000 |
| Leicester Tooling Limited | Manufacturing | 1997 |
| Leicester Traditional Roofing Ltd | Construction | 2003 |
| Leicestershire & Rutland Organisation for the Relief of Suffering Limited | Health & social care | 1977 |
| Leicestershire and Rutland Cafe Limited | Hospitality | 2021 |
| Leicestershire Forklifts Ltd | Administrative & support | 2025 |
| Leicestershire Leicester and Rutland Headway | Health & social care | 1998 |
| LEO Industries Ltd | Information & communication | 2017 |
| Leogenic Pharma Ltd | Information & communication | 2018 |
| Lesta Packaging PLC | Wholesale & retail | 1978 |
| Lexington Packaging Limited | Manufacturing | 1995 |
| Leyland Oak Ltd | Health & social care | 2023 |
| Limelight Studios Ltd | Manufacturing | 2002 |
| Lindley Flowers Limited | Wholesale & retail | 2003 |
| Ljd.Rn Limited | Public administration | 2023 |
| LMJ Electrical Limited | Construction | 2004 |
| Lochdale Limited | Administrative & support | 2007 |
| Longfield Kindergarten Limited | Education | 2002 |
| Look Limited | Information & communication | 2006 |
| Lookmaster Limited | Agriculture & fishing | 1988 |
| Lote Tree Tuition Ltd | Education | 2019 |
| Loughborough Carers Limited | Health & social care | 2004 |
| Loughborough Roofing Ltd | Construction | 2005 |
| Loughborough Schools Foundation | Education | 2000 |
| Loughborough Sites Limited | Real estate | 1929 |
| Loughborough Specsavers Limited | Wholesale & retail | 1992 |
| Loughborough Visionplus Limited | Wholesale & retail | 1992 |
| Lovell School of Motoring Limited | Education | 2004 |
| LPG Alliance Ltd | Administrative & support | 2006 |
| LSF Shop Limited | Wholesale & retail | 1987 |
| LSP Developments Limited | Construction | 2003 |
| LST Accountancy Limited | Professional & scientific | 2003 |
| Lucking Management Limited | Real estate | 1999 |
| Lucy Kinsella Limited | Arts & recreation | 2003 |
| Lutterworth Sound & Vision Limited | Wholesale & retail | 2002 |
| LUX Styling Limited | Other services | 2003 |
| Lyfe Accountants Limited | Professional & scientific | 2007 |
| Lynroys Limited | Hospitality | 2003 |
| Lynroys Restaurant Limited | Hospitality | 2003 |
| Lynton Court (Barwell) Management Company Limited | Households | 2006 |
| Lynx Marketing Services Limited | Extraterritorial | 1999 |
| Lynx Touch Limited | Manufacturing | 2000 |
| M & a Estates (Leicester) Limited | Real estate | 2004 |
| M & M Cleaning Services Limited | Other services | 2006 |
| M & M Training Services Limited | Education | 2002 |
| M D S Windows Limited | Construction | 2006 |
| M Fairbrother Building Contractors Limited | Construction | 2002 |
| M J Woods Accountancy Limited | Professional & scientific | 2003 |
| M K TEC Ltd | Administrative & support | 2006 |
| M N Kolia Ltd | Wholesale & retail | 2004 |
| M. C. Lacey Ltd | Construction | 2002 |
| M. F. Tool and Engineering Co. Limited | Manufacturing | 1963 |
| M. Garness Joinery | | 1999 |
| M.A. Omar Limited | Health & social care | 2005 |
| M.D. Electrical UK Limited | Construction | 2006 |
| M.E.G. Holdings Limited | Professional & scientific | 1999 |
| M.J. Green Limited | Construction | 2003 |
| M.J. Ross Ltd | Administrative & support | 2005 |
| Malthouse Furniture & Joinery Limited | Manufacturing | 2007 |
| Manchester Brick and Precast Ltd | Manufacturing | 1994 |
| Mandator Control Systems Limited | Manufacturing | 1989 |
| Manor Court Groby Ltd | Households | 2004 |
| Manorfive Ltd | Professional & scientific | 1998 |
| Mark Tommis Ltd | Professional & scientific | 2011 |
| Mark Walsh Building & Maintenance Ltd | Construction | 2026 |
| Marqu Site Services Limited | Construction | 2001 |
| Martyn Thacker & Associates Limited | Professional & scientific | 2004 |
| Marylebone Books Limited | Wholesale & retail | 2005 |
| Mason & SON (Chemists) Limited | Wholesale & retail | 1960 |
| Mason Goodin Limited | Construction | 2003 |
| Massfab Ltd | Manufacturing | 2004 |
| Matrix Investments Limited | Professional & scientific | 2001 |
| Matt Bottrill Performance Coaching Ltd | Arts & recreation | 2014 |
| Mavrick Blinds Limited | Manufacturing | 2001 |
| Max's Furniture Shop Limited | Wholesale & retail | 2003 |
| MAY Plants Ltd | Wholesale & retail | 2006 |
| Mayday Financial Services Limited | Financial services | 1997 |