| Lindsey Technical Services Limited | Professional & scientific | 1999 |
| Little Angels and Kids Club Ltd | Health & social care | 2014 |
| Little Eastgate Management Company Limited | Households | 2026 |
| Little Italy Brigg Limited | Hospitality | 2025 |
| Little London Residents Limited | Households | 2026 |
| Littlegate Developments Limited | Wholesale & retail | 2012 |
| Littlegate Limited | Administrative & support | 2007 |
| Littlegate Properties Limited | Real estate | 1998 |
| LIZ Trubshaw Psychology Services Limited | Health & social care | 2017 |
| LKL Mobile Services Ltd | Manufacturing | 2025 |
| Loaded TN Limited | Hospitality | 2026 |
| LOG Properties Ltd | Real estate | 2026 |
| London Renewable Installations Ltd | Construction | 2023 |
| London's Construction Ltd | Construction | 2019 |
| Loud Sound (Lincolnshire) Limited | Administrative & support | 2016 |
| LPL Properties NO.4 Limited | Real estate | 2012 |
| LS Trade Limited | Wholesale & retail | 2015 |
| Luguvalium Mechanical and Aeronautical Limited | Manufacturing | 2026 |
| Luminosity Digital Ltd | Information & communication | 2019 |
| Lumière Skin Studio Ltd | Other services | 2024 |
| Luxe Events Hire Limited | Administrative & support | 2026 |
| Luxuk Automotive Ltd | Construction | 2025 |
| Luxury Getaway Ltd | Transport & logistics | 2019 |
| LW Freeholding Ltd | Other services | 2025 |
| LW Leaseholding Ltd | Other services | 2025 |
| Lwgb Investments Ltd | Real estate | 2018 |
| Lynx Fire Consultancy Ltd | Public administration | 2025 |
| M & a Roberts Ltd | Health & social care | 2013 |
| M & S Moore Limited | Construction | 2005 |
| M C Developments (Scawby) Limited | Construction | 2002 |
| M C Smith Properties Ltd | Real estate | 2025 |
| M J P Interim Solutions Limited | Other services | 2012 |
| M&M Enterprises Yorkshire Ltd | Wholesale & retail | 2026 |
| M.H. Motor Services Limited | Wholesale & retail | 2005 |
| M.J.H. Engineering Limited | Professional & scientific | 1990 |
| M.R Plumbing & Heating (Crowle) Limited | Construction | 2017 |
| Malaspina Engineering Limited | Professional & scientific | 2024 |
| Manor Consulting Limited | Professional & scientific | 2023 |
| Manton Common Renewables Limited | Agriculture & fishing | 2026 |
| MAR Construction Ltd | Extraterritorial | 2021 |
| Marawise Treatments Limited | Manufacturing | 1983 |
| Marine Technology Consulting Limited | Professional & scientific | 2016 |
| Mark Glenwright Joinery Ltd | Manufacturing | 2025 |
| Market Court Developments Limited | Real estate | 2007 |
| Masons Arms (Louth) Limited | Hospitality | 2010 |
| Matt Moran Automation Services Ltd | Construction | 2018 |
| Mavenbridge Limited | Professional & scientific | 2026 |
| Maxima Locks Limited | Wholesale & retail | 2012 |
| Mazorda Ltd | Information & communication | 2016 |
| Mbtek Limited | Professional & scientific | 2021 |
| MC Developments (Barwick Court) Limited | Real estate | 2022 |
| Mcewen Holdings Limited | Financial services | 2021 |
| MD Millfield Properties Limited | Households | 2025 |
| Medimusic Ltd | Professional & scientific | 2016 |
| Medoola Comms Limited | Professional & scientific | 2021 |
| MEH Consulting Limited | Professional & scientific | 2022 |
| Mepa Properties Ltd | Real estate | 2020 |
| Merry Lodge Events Ltd | Administrative & support | 2024 |
| Messingham Horse & Foal Show Limited | Arts & recreation | 2015 |
| Messrs L Craven Limited | Agriculture & fishing | 2013 |
| Metis Management Services Limited | Professional & scientific | 2012 |
| Meylau 1 Limited | Professional & scientific | 2021 |
| Meylau 2 Limited | Professional & scientific | 2021 |
| Mhme Lincolnshire Ltd | Manufacturing | 2013 |
| Micawbers GY Ltd | Real estate | 2018 |
| Michaela Ltd | Hospitality | 2026 |
| Midgley Motor Company Limited | Wholesale & retail | 2018 |
| MIKESMITH1663 Ltd | Professional & scientific | 2016 |
| Millers Barn Ltd | Hospitality | 2019 |
| Mills and Newman Construction Ltd | Construction | 2025 |
| Milner Collections Ltd | Wholesale & retail | 2023 |
| Minshall Security Ltd | Administrative & support | 2002 |
| Mitchell's Timberworks Limited | Construction | 2019 |
| MJ Properties Brigg Ltd | Real estate | 2024 |
| MJ Smart Stays Ltd | Real estate | 2026 |
| MJ Tiling Limited | Construction | 2003 |
| MJB Sportscars Limited | Wholesale & retail | 2021 |
| Mjsk Investments Ltd. | Real estate | 2013 |
| MLJ Logistics Ltd | Transport & logistics | 2015 |
| MM Insight Ltd | Professional & scientific | 2019 |
| MMP (Brigg) Limited | Administrative & support | 2016 |
| MNS Financial Consultancy Limited | Financial services | 2014 |
| Monica DOE Limited | Administrative & support | 2025 |
| Mood Digital Ltd | Administrative & support | 2017 |
| Moorfield Court Residents (Narberth) Limited | Households | 2026 |
| Motor Shed YT UK Ltd | Real estate | 2023 |
| Moulvibazar Ltd | Hospitality | 2024 |
| MRG Health Ltd | Public administration | 2022 |
| Musilova Theatre Arts Limited | Arts & recreation | 2018 |
| MXN Group Limited | Financial services | 2019 |
| MXN Investments Limited | Financial services | 2019 |
| My Barns Group Ltd | Administrative & support | 2007 |
| N M K Medical Consultations Limited | Health & social care | 2010 |
| N S Services (Lincs) Ltd | Agriculture & fishing | 2009 |
| N.H. Surveying and Engineering Consultants Limited | Professional & scientific | 2005 |
| N.R.H. (Contractors) Limited | Agriculture & fishing | 1999 |
| Nationwide Kitchen Investments Limited | Financial services | 2024 |
| Natures Corridors Ltd | Professional & scientific | 2024 |
| Nebula Vape Store Ltd | Wholesale & retail | 2025 |
| Nelipak Elsham Limited | Manufacturing | 1992 |