| Lizzie Hair Design Limited | Professional & scientific | 2012 |
| LJ Emery Limited | Professional & scientific | 2013 |
| LJC Mechanical & Electrical Services Ltd | Construction | 2014 |
| LJM Communications Limited | Construction | 2019 |
| LJM Hire Ltd | Construction | 2024 |
| LJP Property Services Limited | Real estate | 2013 |
| LK Pump Services Limited | Professional & scientific | 2018 |
| LKA Roofing Limited | Construction | 2025 |
| LKJ Services Ltd | Real estate | 2007 |
| LKR Electrical Contractors Limited | Administrative & support | 2008 |
| Lloyd Morgan Group Holdings Ltd | Financial services | 2025 |
| Lloyd Morgan Group Limited | Professional & scientific | 2007 |
| Lloyd Morgan Management Limited | Professional & scientific | 2007 |
| Lloyd Morgan Solutions Limited | Professional & scientific | 2007 |
| LLT Property Investment Ltd | Real estate | 2023 |
| LLT Resources Ltd | Health & social care | 2022 |
| LM Green Plumbing & Heating Limited | Construction | 2013 |
| LMB Procurement Limited | Administrative & support | 2025 |
| LMG Commercial Services Ltd | Households | 2024 |
| Lmnc Consulting Limited | Professional & scientific | 2019 |
| LMS UK Property Limited | Real estate | 2026 |
| LNM Investments Limited | Real estate | 2013 |
| LO Cost Convenience Limited | Wholesale & retail | 2018 |
| Local Medics & Ambulance Service Ltd | Professional & scientific | 2021 |
| Local Property Partner Limited | Construction | 2008 |
| Locke & Locke Ltd | Real estate | 2016 |
| Lodge Farm Management Company (Cheslyn HAY) Limited | Real estate | 2016 |
| Loft Worx Limited | Manufacturing | 2019 |
| Loice PVT Ltd | Health & social care | 2020 |
| Lone Wolf Software Limited | Information & communication | 2024 |
| Long Grass Consultancy Limited | Information & communication | 2008 |
| Longbows & Arrows Ltd | Manufacturing | 2020 |
| Longden Homes Ltd | Real estate | 2024 |
| Longford Garden Limited | Hospitality | 2024 |
| Lookback Training Ltd | Administrative & support | 2026 |
| Lorch Schweisstechnik Limited | Manufacturing | 1987 |
| LOS 899 Limited | Hospitality | 2017 |
| Lost Property Management Limited | Real estate | 2022 |
| Lotus & Light Holistic Therapy Ltd | Health & social care | 2025 |
| Lovely Little Box Shop Ltd | Wholesale & retail | 2024 |
| Lowys Lifts Limited | Professional & scientific | 2025 |
| LSI Logistic Solutions Midlands Limited | Administrative & support | 2012 |
| LSP Transport Ltd | Transport & logistics | 2025 |
| LT COX Property Development Limited | Real estate | 2024 |
| LTE Graphics Ltd | Professional & scientific | 2022 |
| Lucas Cycles Ltd | Wholesale & retail | 2020 |
| Lumiolex Ltd | Professional & scientific | 2026 |
| Luna Renewables Limited | Construction | 2022 |
| Lunaloves Tanning Co Ltd | Other services | 2026 |
| Lunatix Ltd | Wholesale & retail | 2026 |
| Luxe Alcobev Limited | Wholesale & retail | 2024 |
| Luxe INK Tattoo Studio Ltd | Other services | 2025 |
| Luxury Co. Hair Limited | Wholesale & retail | 2025 |
| Luxury Land Liners Limited | Transport & logistics | 2007 |
| Lvdc Holdings Limited | Other services | 2018 |
| Lynehill Holdings Company Limited | Administrative & support | 2015 |
| Lyons Integrated Services Ltd | Construction | 2026 |
| Lypa Ltd | Wholesale & retail | 2015 |
| Lytham Grange CH Ltd | Health & social care | 2024 |
| Lytham Invest Ltd | Health & social care | 2023 |
| Lytham Lease Limited | Health & social care | 2024 |
| M & P Bickerton Carpentry Ltd | Construction | 2014 |
| M & E Heating Services Limited | Construction | 2014 |
| M & S Drywall Finishers Limited | Construction | 2022 |
| M & S Transport (Midlands) Limited | Transport & logistics | 2003 |
| M a P Jointing Ltd | Construction | 2023 |
| M Bryant Builders Limited | Construction | 2007 |
| M Carey Ltd | Construction | 2023 |
| M Hyden Fabrications Ltd | Manufacturing | 2024 |
| M Neal and Associates Limited | Construction | 2024 |
| M Nicholls Bricklaying Services Ltd | Construction | 2021 |
| M Q H Holdings Limited | Financial services | 2025 |
| M R Event Safety Ltd | Professional & scientific | 2024 |
| M Smith Bricklaying Services Limited | Construction | 2019 |
| M&L Contract Services Ltd | Other services | 2015 |
| M&L Truck Wash Services Ltd | Other services | 2018 |
| M&P Systems Limited | Construction | 2026 |
| M. Squared Bathrooms Ltd | Construction | 2014 |
| M.A.C. Homes Limited | Real estate | 2025 |
| M.A.H. Precision Engineering Ltd | Manufacturing | 2018 |
| M.E. Technical and Tooling Services Ltd | Professional & scientific | 2017 |
| M.E.L. Supported Living Limited | Health & social care | 2020 |
| M.G Stretton Services Ltd | Wholesale & retail | 2010 |
| M.H Commercials Ltd | Wholesale & retail | 2019 |
| M.M. Developments (UK) Limited | Hospitality | 1994 |
| M.R. Chapman Limited | Construction | 2002 |
| M.R. Minerals Limited | Wholesale & retail | 2014 |
| M.S.P Luxury Travel Ltd | Transport & logistics | 2023 |
| M3 Shows Ltd | Education | 2018 |
| MA Clarke Construction Services Limited | Construction | 2016 |
| MAC Fabrication Services Ltd | Manufacturing | 2023 |
| MAC Physiotherapy Ltd | Health & social care | 2018 |
| Macy Systems Limited | Other services | 2014 |
| MAD Sport Ltd | Arts & recreation | 2026 |
| Madison HDG Ltd | Administrative & support | 2025 |
| Maevo Properties Ltd | Real estate | 2026 |
| Magenta Cherry Limited | Administrative & support | 2022 |
| Magic Mike's Tcg's Ltd | Wholesale & retail | 2023 |
| Magic TV Limited | Education | 2020 |
| Magneti Marelli UK Limited | Manufacturing | 1989 |