| L.P.G.Convertors Limited | Professional & scientific | 1961 |
| L.W.G. Limited | Wholesale & retail | 2003 |
| Lady Barn House School Limited | Education | 1994 |
| Lamont Limited | Construction | 1988 |
| Land Builders + Property Repairs Limited | Administrative & support | 2002 |
| Landslow Investments Ltd | Real estate | 2003 |
| Landsmith Limited | Professional & scientific | 1996 |
| Landtech Solutions Limited | Administrative & support | 2005 |
| Lane Court Management Limited | Administrative & support | 2001 |
| Langer & Co Limited | Professional & scientific | 2002 |
| Lankem Ltd. | Manufacturing | 1999 |
| Laser Custom Products Ltd | Manufacturing | 2020 |
| Last Link Limited | Professional & scientific | 2006 |
| Lasting Impressions Driveways (NW) Limited | Wholesale & retail | 2003 |
| Latchford Conservative Club Limited | Hospitality | 1991 |
| Laura's Travel Limited | Administrative & support | 2025 |
| Lawton Grange Congleton (Residents) Management Company Limited | Households | 2004 |
| Lawton Tools (Rail Products) Ltd | Wholesale & retail | 1992 |
| Lawton Tools Limited | Wholesale & retail | 1969 |
| Lawyers 4 Motorists Limited | Administrative & support | 2004 |
| Lead Lounge Limited | Administrative & support | 2023 |
| Leading Edge Developments Limited | Manufacturing | 2003 |
| Leadtank Ltd | Professional & scientific | 2025 |
| Leaf Property (Hazel Grove) Limited | Financial services | 2022 |
| Leanne REA Medical Aesthetics Limited | Other services | 2022 |
| Learning Curve (Lancashire) Holdings Limited | Financial services | 2017 |
| Learning Curve (Lancashire) Limited | Health & social care | 2011 |
| Learning Journey Day Nursery Waterfront Ltd | Education | 2018 |
| Leck Group Ltd | Financial services | 1925 |
| Lees Electrical Contractors Limited | Construction | 2003 |
| Lees Walker Precision Cutters Limited | Administrative & support | 1998 |
| Leigh and Company (Stationers) Limited | Wholesale & retail | 1975 |
| Leisure Sales (Cheshire) Limited | Administrative & support | 1998 |
| Lennon Hotels Limited | Extraterritorial | 2004 |
| Lesley Smith Limited | Professional & scientific | 2007 |
| Let's Build IT Limited | Construction | 2017 |
| Lets Talk Tripe Ltd | Wholesale & retail | 2026 |
| Lewis Legal False Allegations CIC | Administrative & support | 2025 |
| Lewis Street Management Limited | Households | 2007 |
| Leyton Fasteners Limited | Administrative & support | 1980 |
| Leywell Limited | Construction | 1995 |
| LFI Limited | Financial services | 2000 |
| LHS (UK) Limited | Extraterritorial | 1990 |
| Life Enterprise Technology Group Limited | Financial services | 2017 |
| Life Enterprise Technology Limited | Financial services | 2019 |
| Life ETG Holdings Limited | Financial services | 2020 |
| Life Landscaping Ltd | Administrative & support | 2009 |
| Lightfoot Body Repairs Limited | Wholesale & retail | 2017 |
| Lightside Supplies and Manufacturing Limited | | 1985 |
| Lightstone Avery Dell LLP | | 2022 |
| Lightstone Beckenham LLP | | 2023 |
| Lightstone Castleford LLP | | 2026 |
| Lightstone Day Nurseries 2 LLP | | 2022 |
| Lightstone Irthlingborough LLP | | 2024 |
| Lightstone Kidbrooke LLP | | 2026 |
| Lightstone MV LLP | | 2023 |
| Lightstone Reading LLP | | 2025 |
| Lightstone Stafford LLP | | 2022 |
| Lightstone Wandsworth LLP | | 2025 |
| Lime Earth Conservation Limited | Manufacturing | 2000 |
| Lime Tree Estates Limited | Real estate | 2005 |
| Lindow Engineering Limited | Professional & scientific | 2007 |
| Linear Design & Construct (Manchester) Limited | Construction | 2020 |
| Linguafrica Ltd | Information & communication | 2025 |
| Linx-To Project Controls Limited | Professional & scientific | 2007 |
| Lite (Stockport) Limited | Education | 2003 |
| Litho Direct Ltd | Extraterritorial | 2003 |
| Liverpool Nurseries (Cottage) Limited | Health & social care | 2011 |
| Liverpool Nurseries (Greenbank) Limited | Health & social care | 2011 |
| Liverpool Nurseries (Holdings) Limited | Health & social care | 2011 |
| Lligwy Estate Company Limited | Real estate | 2007 |
| Lloyd Williams Properties Limited | Real estate | 2000 |
| Lobster Technology Ltd | Information & communication | 1996 |
| Locker Heatshielding Limited | Manufacturing | 2006 |
| Lodge Retreats Limited | Real estate | 2000 |
| Logic Form Limited | Manufacturing | 1998 |
| Lombardy Court Residents Association Limited | Households | 1999 |
| Longden Estates Limited | Real estate | 1987 |
| Longevity Worldwide Ltd | Wholesale & retail | 2021 |
| Loomfield Limited | Information & communication | 1988 |
| Lopex Guards Limited | Administrative & support | 2020 |
| Lords TQS Limited | Transport & logistics | 1993 |
| Lorimort Ltd | Professional & scientific | 2006 |
| LOS Communications Limited | Professional & scientific | 2025 |
| Lowernab Technology Ltd | Professional & scientific | 2003 |
| Lowprint Limited | Manufacturing | 1984 |
| Loxley's Stratford Limited | Hospitality | 2007 |
| LTE Developments Ltd | Construction | 2021 |
| LTE Investments Ltd | Financial services | 2021 |
| Luke Bagshaw LLP | | 2023 |
| Lundsford Limited | | 1972 |
| Lyme Construction Limited | Construction | 2023 |
| Lymefield Garden Centre Limited | Wholesale & retail | 1997 |
| Lynton Aesthetic Services Limited | Administrative & support | 2007 |
| Lynton Clinics Limited | Other services | 2007 |
| Lynwood Consultancy Services Limited | Professional & scientific | 2005 |
| M & EMS Limited | Hospitality | 2005 |
| M & M Aggregates Ltd | Transport & logistics | 2018 |
| M & S Logistics Limited | Transport & logistics | 1998 |
| M & S.M.Andrew Limited | Financial services | 2006 |