| LK Health Ltd | Wholesale & retail | 2024 |
| LKP Consultants Limited | Administrative & support | 2014 |
| Llad Estates Ltd | Real estate | 2026 |
| Llain Delyn Lodge Ltd | Hospitality | 2021 |
| Lloyds Coach Services Ltd | Administrative & support | 2023 |
| Llsal Ltd | Professional & scientific | 2025 |
| LM Funding Solutions Limited | Financial services | 2019 |
| Logico Limited | Professional & scientific | 2004 |
| Lomond Gynaecological Services Limited | Health & social care | 2015 |
| London Lifecare Ltd | Health & social care | 2022 |
| Longmoor Launderette Limited | Other services | 1986 |
| Lost in Reality Limited | Wholesale & retail | 2025 |
| Louis George Rail Ltd | Construction | 2014 |
| Love 2 Buy Cars Limited | Wholesale & retail | 2018 |
| Loveight Ltd | Hospitality | 2023 |
| Lowry Logistics Limited | Transport & logistics | 2014 |
| LPD Northwest Ltd | Real estate | 2020 |
| LR Diving Services Limited | Professional & scientific | 2013 |
| LR Plumbing & Heating Ltd | Construction | 2021 |
| LRB Property Renovations Ltd | Construction | 2023 |
| LRL Legal Services Ltd | Professional & scientific | 2026 |
| LSM Comms Ltd | Information & communication | 2021 |
| LTP Electrical Ltd | Construction | 2026 |
| Luana Luca Limited | Health & social care | 2018 |
| Luna Estates (North West) Limited | Real estate | 2017 |
| Luxe Baby Store Ltd | Wholesale & retail | 2026 |
| Luxtel Ltd | Information & communication | 2018 |
| Luxxe Seasonal Decor Ltd | Wholesale & retail | 2025 |
| LV Consultancy Limited | Public administration | 2011 |
| LW6 Ltd | Other services | 2017 |
| LW6 Properties Ltd | Real estate | 2017 |
| Lynda P Lyon Ltd | Health & social care | 2017 |
| Lyndels Property Services Ltd | Real estate | 2007 |
| Lyndsey Peace Ltd | Health & social care | 2022 |
| Lyons Concierge Ltd | Wholesale & retail | 2025 |
| M & L Holdings Limited | Financial services | 1998 |
| M & R Joinery Services Limited | Construction | 2000 |
| M and B Developments Liverpool Limited | Construction | 2026 |
| M Baker Services Limited | Transport & logistics | 2021 |
| M Goodwin UK Limited | Financial services | 2024 |
| M J Quinn Solar Limited | Construction | 2011 |
| M N Badger Property Limited | Construction | 2017 |
| M R Brown Ltd | Manufacturing | 2008 |
| M&D Books LLP | | 2024 |
| M&D Ceramic Tiling Contractors Ltd | Construction | 2022 |
| M&F Property Management Ltd | Real estate | 2020 |
| M&M Key Homes Ltd | Real estate | 2025 |
| M&S Whiston Ltd | Wholesale & retail | 2025 |
| M.B.O.S. Limited | Manufacturing | 2001 |
| M.J.Harding Limited | Administrative & support | 2021 |
| Mabel Boutique Ltd | Wholesale & retail | 2019 |
| Mabley Automation Limited | Construction | 2011 |
| MAC Property Holdings (NW) Ltd | Financial services | 2022 |
| Mackay Goodwin Holdings Limited | Financial services | 2024 |
| Mackay Goodwin Limited | Financial services | 2018 |
| Maddison Blinds Limited | Manufacturing | 2010 |
| Made 2 Measure Soft-Furnishings Ltd | Manufacturing | 2006 |
| Magodonga Properties Limited | Real estate | 2025 |
| Maiden Properties Incorporate Ltd | Construction | 2024 |
| Makarios 4 Squared Ltd | Education | 2014 |
| Malenzo Ltd | Wholesale & retail | 2018 |
| MAN LEE 128 Ltd | Real estate | 2018 |
| Manapix Interactive Limited | Information & communication | 2025 |
| Manda-It Limited | Information & communication | 2022 |
| Mane Street Vendors Ltd | Hospitality | 2024 |
| Mardan Limited | Information & communication | 2001 |
| Marian Nail and Beauty Ltd | Other services | 2025 |
| Marlborough Builders Ltd | Construction | 2024 |
| Marple Limited | Manufacturing | 2000 |
| Marzech Limited | Hospitality | 2014 |
| Matosa Ltd | Real estate | 2006 |
| Matosa P Ltd | Real estate | 2020 |
| Matosa PAM Ltd | Real estate | 2020 |
| Matt Fiddes Cheshire LLP | | 2020 |
| Matthias Management Solutions Ltd | Real estate | 2024 |
| Matty MC Holdings Ltd | Financial services | 2026 |
| Maturo Meathouse Ltd | Hospitality | 2023 |
| Mawdsley Plant Ltd | Wholesale & retail | 2025 |
| Mawdsley Property Ltd | Real estate | 2025 |
| MAX Interactive UK Limited | Wholesale & retail | 2014 |
| Maxim Electrical Contractors Ltd | Construction | 2023 |
| Maxmade Limited | Manufacturing | 2000 |
| Maxwell 2006 Limited | Construction | 2006 |
| Maxx Design Limited | Professional & scientific | 1995 |
| MB Painters Ltd | Construction | 2019 |
| Mccain Property Management Limited | Households | 2017 |
| Mccracken Property Ltd | Real estate | 2026 |
| MCF Engineering Ltd | Professional & scientific | 2026 |
| MCG Joinery Contractors Ltd | Construction | 2024 |
| Mcglynn Consultancy Limited | Professional & scientific | 2007 |
| MCH Developments Ltd | Construction | 2024 |
| MCL Property Services Ltd | Real estate | 2023 |
| MCL Refrigeration Maintenance Ltd | Manufacturing | 2018 |
| Mclave Landscaping Ltd | Real estate | 2019 |
| Mcqueen Properties Ltd | Financial services | 2019 |
| Mcre Limited | Other services | 2024 |
| Mcss International Ltd | Arts & recreation | 2025 |
| Mcss JFC CIC | Education | 2025 |
| Mcwp Ltd | Construction | 2024 |
| MD Productions Entertainment Ltd | Arts & recreation | 2024 |