| Louth Road (Scartho) Management Company Limited | Households | 2004 |
| Louts Online Sales Limited | Wholesale & retail | 2024 |
| Love Safety Ltd | Other services | 2019 |
| Love Weave Extensions Limited | Other services | 2025 |
| Love&Snuggles Ltd | Other services | 2019 |
| Lovelle Bacons LLP | | 2012 |
| LOW Farm Limited | Agriculture & fishing | 2004 |
| LOW Therm Ltd | Construction | 2020 |
| Lowercase Theatre Ltd | Arts & recreation | 2023 |
| Loxmeadows Limited | Other services | 2006 |
| LP Joinery (Grimsby) Limited | Construction | 2026 |
| LP Optimisation Limited | Health & social care | 2026 |
| LP Roofing Solutions Limited | Construction | 2020 |
| LP SD Eighty One Limited | Wholesale & retail | 2023 |
| LP SD Seventy Nine Limited | Wholesale & retail | 2023 |
| LR Machining Solutions Ltd | Professional & scientific | 2018 |
| LRC Electrical Contractors Limited | Construction | 2024 |
| LRC Electrical Solutions Limited | Construction | 2021 |
| Lrca Limited | Professional & scientific | 2019 |
| LRH Specialist Consulting Limited | Information & communication | 2019 |
| Lrhh Estates Ltd | Real estate | 2023 |
| LS Fabrication and Welding Services Ltd | Professional & scientific | 2023 |
| LSD Motor Services Limited | Wholesale & retail | 2026 |
| LSG (Safety) Limited | Professional & scientific | 2014 |
| LSK Project Management Limited | Construction | 2025 |
| Lsmeps Limited | Construction | 2017 |
| LSR Design Limited | Administrative & support | 2018 |
| LSW92 Limited | Real estate | 2024 |
| LT & AE Holdings Limited | Administrative & support | 2012 |
| LT Commercial Vehicles Limited | Transport & logistics | 2016 |
| LTA Cleaning Group Ltd | Construction | 2021 |
| LTG Stove Installations and Chimney Sweeps Ltd | Administrative & support | 2024 |
| Ltgm Limited | Construction | 2013 |
| Lu-La Belle Couture Limited | Other services | 2017 |
| Lu-Vic Electrical Limited | Construction | 2009 |
| LU2 Construction Ltd | Construction | 2018 |
| Luca's Firewood Ltd | Wholesale & retail | 2024 |
| Lucas Contracting Limited | Construction | 1996 |
| Lucas Pizzeria Ltd | Hospitality | 2025 |
| Luciano Pizzeria Ltd | Hospitality | 2024 |
| Lucky Echo Limited | Wholesale & retail | 2025 |
| Lucror Investments Limited | Extraterritorial | 2022 |
| Ludensian Limited | Hospitality | 2024 |
| Ludus Magnus Training Centre Limited | Arts & recreation | 2013 |
| Lujo Hospitality Ltd | Hospitality | 2025 |
| Luke Aaron Property Consultants Limited | Professional & scientific | 2025 |
| Luke Batchelor Limited | Health & social care | 2025 |
| Lukka Consulting Limited | Professional & scientific | 2014 |
| Lulu Trans Ltd | Transport & logistics | 2016 |
| Lumen Wild Studio Ltd | Manufacturing | 2025 |
| Lumenex Lighting Ltd | Wholesale & retail | 2014 |
| Lumia GEL Ltd | Wholesale & retail | 2024 |
| Luna Software Ltd | Administrative & support | 2024 |
| Luxmie Ltd | Information & communication | 2011 |
| Luxury Abroad Estates Limited | Real estate | 2025 |
| Luxx Events Ltd | Administrative & support | 2024 |
| LUZ Holidays Limited | Real estate | 2015 |
| LWE - LEE Walton Engineering Services Ltd. | Construction | 2017 |
| Lyco Sphere Ltd | Wholesale & retail | 2026 |
| Lynn Handley Contract Catering Ltd | Hospitality | 2014 |
| Lynn Wind Farm Limited | Energy | 2001 |
| Lynwood (Devon) Ltd | Construction | 2017 |
| Lynx Recycling and Recovery Limited | Water & waste | 2010 |
| Lytollis Limited | Construction | 2016 |
| M & a Aujla Properties Ltd | Real estate | 2006 |
| M & C Housing Ltd | Real estate | 2015 |
| M & E Delivery Services Ltd | Transport & logistics | 2015 |
| M & J Electrical Solutions Ltd | Other services | 2017 |
| M & S Builders & Joiners Limited | Construction | 2005 |
| M a Holdings 2021 Ltd | Financial services | 2021 |
| M B D Tiling Ltd | Construction | 2022 |
| M Barton Construction Services Limited | Other services | 2012 |
| M Bass Solutions Limited | Other services | 2025 |
| M Blythin Joinery Limited | Manufacturing | 2002 |
| M C Marwood Limited | Wholesale & retail | 2003 |
| M G Joinery Services Limited | Construction | 2019 |
| M G Location Services Ltd | Administrative & support | 2018 |
| M G Property Letting Limited | Real estate | 2021 |
| M I a Energy Limited | Education | 2025 |
| M Industries Ltd | Wholesale & retail | 2025 |
| M J Davis Welding & Inspection Ltd | Professional & scientific | 2019 |
| M J Wilson Group Limited | Wholesale & retail | 2017 |
| M K Harrison Consultants Limited | Professional & scientific | 2024 |
| M L Renewables Ltd | Construction | 2019 |
| M L Scaffolding Services Ltd | Construction | 2023 |
| M M Autoshine and Bodyshop Services Ltd | Wholesale & retail | 2019 |
| M Mchale Services Ltd | Construction | 2024 |
| M Steer Building Ltd | Construction | 2019 |
| M Z Security Limited | Construction | 2024 |
| M&B Safety Netting Ltd. | Construction | 2020 |
| M&C Transuk Ltd | Transport & logistics | 2020 |
| M&H Mechanical Engineering Ltd | Professional & scientific | 2017 |
| M&J Carpentry Services Ltd | Other services | 2016 |
| M&K Car Repairs Ltd | Wholesale & retail | 2024 |
| M-Jf Engineering Services Limited | Professional & scientific | 2023 |
| M-Speed Ltd | Transport & logistics | 2019 |
| M. Angrave Limited | Health & social care | 2008 |
| M.Biegaj Transport Ltd | Transport & logistics | 2016 |
| M.C.H. Haulage Limited | Transport & logistics | 2004 |
| M.I. Advantage Ltd | Information & communication | 2022 |