| KRS Productions Limited | Arts & recreation | 2017 |
| KS & F Limited | Financial services | 2022 |
| L &S North West Properties Limited | Real estate | 2023 |
| L Stringer Ltd | Professional & scientific | 2017 |
| L Thornton Limited | Construction | 2015 |
| L&Awhippys Ltd | Hospitality | 2025 |
| LAB Ventures Ltd | Real estate | 2023 |
| Lakshhmi Limited | Hospitality | 2025 |
| Lancashire Igloo Hire Limited | Administrative & support | 2022 |
| Lancashire Properties North West Ltd | Real estate | 2021 |
| Lancashire Tiling Company Limited | Construction | 2006 |
| Langrose Properties Limited | Real estate | 2026 |
| Lannister Real Estate Ltd | Real estate | 2024 |
| Latham Lees Baxendale Ltd | Professional & scientific | 2023 |
| Latham Lees Limited | Professional & scientific | 2011 |
| Laurel Homes & Investments Limited | Real estate | 2023 |
| LAX Foundry Limited | Information & communication | 2026 |
| Layton Plant Hire Limited | Wholesale & retail | 1974 |
| Leather - Emboss UK Limited | Wholesale & retail | 2015 |
| LEE Woodley (Blackpool) Ltd | Mining & quarrying | 2011 |
| Legacy Cargo Limited | Transport & logistics | 2014 |
| Legacy Resource & Space Management Global Solutions Ltd | Professional & scientific | 2025 |
| Leroy Ltd | Arts & recreation | 2018 |
| Level 13 Hair Salon Limited | Other services | 2002 |
| Lisa Benson Accountancy Services Ltd | Professional & scientific | 2012 |
| Lisa Jenkinson Aesthetics Ltd | Other services | 2022 |
| Lisa Viner Educational & Examiner Services Ltd | Education | 2021 |
| Little Limos Hire Limited | Administrative & support | 2016 |
| Little Poulton Gardens Management Company - Phase 1 Ltd | Households | 2014 |
| Little Poulton Gardens Management Company Phase 2 Limited | Households | 2005 |
| Lleu Ltd. | Information & communication | 2012 |
| LMM Property Holdings Limited | Financial services | 2025 |
| LMS Consultancy (NW) Ltd | Construction | 2011 |
| Loaf NW Ltd | Hospitality | 2023 |
| Local Approved Trades Limited | Professional & scientific | 2017 |
| Lockhart Housing Limited | Real estate | 2025 |
| Lockwood Neurology Limited | Health & social care | 2022 |
| Longhouse Green Limited | Households | 2012 |
| Longstaff Trading Ltd | Wholesale & retail | 2023 |
| Love Aquatics Limited | Wholesale & retail | 2024 |
| LPS (NW) Limited | Construction | 2016 |
| LTV Lighting Ltd | Construction | 2017 |
| Luke Helmn Ltd | Other services | 2023 |
| Lumia Scientific Ltd | Wholesale & retail | 2026 |
| Lunel Space Ltd | Professional & scientific | 2026 |
| Luther Investments Ltd | Real estate | 2021 |
| LUX Developments and Electrical Ltd | Construction | 2025 |
| LV Black Bull Ltd | Hospitality | 2025 |
| LW Contracts Limited | Construction | 2022 |
| LW Properties Group Ltd | Real estate | 2023 |
| Lytham Cars Limited | Real estate | 2020 |
| M a Rigney Ltd | Construction | 2011 |
| M Barton Consulting Limited | Information & communication | 2019 |
| M Read Solar Ltd | Construction | 2011 |
| M Squared Services Ltd | Professional & scientific | 2022 |
| M&L Cooper Ltd | Transport & logistics | 2015 |
| Macauley Walsh Limited | Real estate | 1999 |
| Macclesfield Blue Zone Management Company Limited | Real estate | 2009 |
| Macclesfield Office Management Company Limited | Real estate | 2009 |
| Mallard Hall Limited | Hospitality | 2018 |
| Mandate Utilities Limited | Information & communication | 2011 |
| Maplevegan Ltd | Hospitality | 2024 |
| Marcus Feeley Limited | Manufacturing | 2013 |
| Marion Developments Ltd | Real estate | 2025 |
| Marion Property Ltd | Real estate | 2022 |
| Mark Hesketh Ltd | Professional & scientific | 2010 |
| Marksafety Consultancy LLP | | 2021 |
| Marksafety Limited | Professional & scientific | 2016 |
| Marnie Motors Ltd | Wholesale & retail | 2024 |
| Marshdale Management Company Limited | Households | 2007 |
| Martin Sellers Design Joinery & Building Limited | Construction | 2013 |
| Marvins Group Limited | Other services | 2019 |
| Masala Bites Limited | Hospitality | 2024 |
| Masterkad Limited | Professional & scientific | 2026 |
| Matthew Reece Limited | Information & communication | 2007 |
| Maxi CUE Lounges Ltd | Arts & recreation | 2025 |
| Maxrac Ltd | Hospitality | 2022 |
| Maxwell Advisory & Consultancy Ltd | Professional & scientific | 2026 |
| MAY Developments (NW) Ltd | Construction | 2017 |
| MBC Courier Limited | Transport & logistics | 2025 |
| MBM Properties Ltd | Real estate | 2024 |
| Mccarthy Michaels Investments Ltd | Real estate | 2020 |
| MCE Management Services Ltd | Information & communication | 2016 |
| Mckenzie Property Services Ltd | Real estate | 2017 |
| Mcqueen Engineering Ltd | Professional & scientific | 2025 |
| MDW Trades Ltd | Construction | 2025 |
| Meadowside Property Limited | Real estate | 1999 |
| Medal Room UK Ltd | Wholesale & retail | 2017 |
| Meet Software Ltd | Information & communication | 2021 |
| Mellor Admin Limited | Hospitality | 2019 |
| Mellor Holdings Limited | Hospitality | 2005 |
| Mereside Stores Ltd | Wholesale & retail | 2012 |
| Meritus DDL Ltd | Wholesale & retail | 2019 |
| Meritus Limited | Wholesale & retail | 1995 |
| Messy Love Properties Ltd | Real estate | 2024 |
| Meterxpert Ltd | Information & communication | 2021 |
| Metro Metals (Burnley) Limited | Water & waste | 1985 |
| MIC Electrical Limited | Construction | 2004 |
| Michael Hornby Consultants Ltd | Professional & scientific | 2014 |
| Michael L Tripp & Co Limited | Professional & scientific | 2008 |