| Lilian Ream Exhibition Gallery Limited | Manufacturing | 1993 |
| Lincolnshire Trading Limited | Wholesale & retail | 2023 |
| Lincs Straw Limited | Agriculture & fishing | 2025 |
| Links Labels Ltd | Manufacturing | 2002 |
| Lions Close Management Company Limited | Households | 2019 |
| Litonela Ltd | Transport & logistics | 2026 |
| Little Bear Feets Limited | Education | 2025 |
| Little Sunshines Pre-School, Upwell Ltd | Health & social care | 2019 |
| Littlechild & SON Limited | Agriculture & fishing | 1942 |
| Liutavis Ltd | Other services | 2024 |
| Live Edge Custom Design Ltd | Manufacturing | 2020 |
| Living in Paradise Limited | Wholesale & retail | 2016 |
| Living Spring Properties Ltd | Real estate | 2019 |
| Living Springs Medicals Ltd | Health & social care | 2013 |
| LJ Pipework & Fabrication Limited | Professional & scientific | 2024 |
| LJ TM Supplies Limited | Construction | 2017 |
| Ljdono Ltd | Wholesale & retail | 2024 |
| LJH Property Developments Ltd | Construction | 2024 |
| Ljprime Ltd | Wholesale & retail | 2025 |
| LJT Contract Services Limited | Construction | 2025 |
| Lkbrreload Limited | Wholesale & retail | 2025 |
| Llama Money Limited | Information & communication | 2025 |
| LLG Management (East Anglia) Ltd | Other services | 2024 |
| Loafers Sandwich Bar Ltd | Hospitality | 2025 |
| Local Shop for YOU Ltd | Wholesale & retail | 2019 |
| Location Homes Limited | Professional & scientific | 2005 |
| Lokys Ltd | Transport & logistics | 2022 |
| London Master Builders Ltd | Construction | 2003 |
| London Road (Kirton) Management Company Limited | Households | 2017 |
| Long Acre Garden Centre Ltd | Wholesale & retail | 2003 |
| Longevity Developmentt Limited | Real estate | 2026 |
| Longstar Construction Ltd | Construction | 2023 |
| Looca Ltd | Wholesale & retail | 2019 |
| Loopy Lou's Childcare Limited | Health & social care | 2018 |
| Lord & Lord (Leisure) Limited | Hospitality | 2026 |
| Lord & Lord (Storage) Limited | Administrative & support | 2026 |
| Lord & Lord Limited | Real estate | 2023 |
| Lory 2020 Ltd | Administrative & support | 2020 |
| Love Clever Cookie Ltd | Manufacturing | 2020 |
| Love&Miracles Ltd | Administrative & support | 2023 |
| LOW Cost Auto Rentals Ltd | Administrative & support | 2023 |
| LOW Cost Tyres Ltd | Wholesale & retail | 2019 |
| Loxley Gate Ltd | Manufacturing | 2025 |
| LP SD Seventy SIX Limited | Wholesale & retail | 2023 |
| LPS Shutter Doors Limited | Construction | 2016 |
| LR Farms Limited | Agriculture & fishing | 2024 |
| LRL Business Services Limited | Professional & scientific | 2009 |
| Lswgs Limited | Construction | 2020 |
| Lucksall Farm Ltd | Agriculture & fishing | 2022 |
| Ludlow Property Restorers Limited | Construction | 2002 |
| Luke Coleman Agricultural Services Limited | Agriculture & fishing | 2023 |
| Luke Stevens Developments Ltd | Wholesale & retail | 2016 |
| Lumaras Storage Ltd | Wholesale & retail | 2025 |
| Lumi Verde Ltd | Professional & scientific | 2025 |
| Luna Restaurant Group Limited | Hospitality | 2026 |
| Luna's Luxury Transport Limited | Transport & logistics | 2025 |
| Lutsi Ltd | Transport & logistics | 2012 |
| LW Bespoke Fabrications Limited | Manufacturing | 2020 |
| LW Construction Solutions Ltd | Construction | 2021 |
| LW Vehicle Services Ltd | Manufacturing | 2019 |
| LWH Plastering Limited | Construction | 2021 |
| Lydson Developments Limited | Construction | 2017 |
| M & a J Pitcher Ltd | Transport & logistics | 2019 |
| M & D Marketing International Ltd | Other services | 2021 |
| M & K Products Limited | Administrative & support | 2008 |
| M & P Electrical Contractors Limited | Construction | 2016 |
| M & R Importing Limited | Wholesale & retail | 2016 |
| M C Driver Direct Ltd | Transport & logistics | 2021 |
| M C Roofing & Building Ltd | Construction | 2024 |
| M C Salter & Sons Limited | Transport & logistics | 2003 |
| M D Market Deeping Ltd | Manufacturing | 2002 |
| M F Haulage & Plant Hire Limited | Transport & logistics | 2006 |
| M Fyson Ltd | Administrative & support | 2004 |
| M Hot Properties Limited | Real estate | 2025 |
| M J J Estates Limited | Real estate | 2003 |
| M Jennings Consultancy Ltd | Professional & scientific | 2022 |
| M R Plant Limited | Wholesale & retail | 2003 |
| M Sport Road & Track Limited | Wholesale & retail | 2022 |
| M Ward Demolition & Crushing Limited | Construction | 2022 |
| M Winsor Builders Limited | Construction | 2016 |
| M&J Electrical Installations Limited | Construction | 2020 |
| M&J Sicklesmere Limited | Real estate | 2025 |
| M. S. Wayman & Sons Limited | Transport & logistics | 2004 |
| M.A.J. Carpentry Limited | Professional & scientific | 2003 |
| M.I.N.Trans Ltd | Transport & logistics | 2014 |
| M.K.G Communications Ltd | Construction | 2020 |
| M.R. Builders & SON Limited | Construction | 2016 |
| M.T. Mcdonnell (Holdings) Limited | Extraterritorial | 2019 |
| MAC P&H Ltd | Construction | 2024 |
| Madhouse Comics Limited | Wholesale & retail | 2026 |
| MAG Security Services Ltd | Other services | 2020 |
| Magdalen Networks Ltd | Information & communication | 2014 |
| Magic Your Band Limited | Manufacturing | 2014 |
| Magosa Ltd | Wholesale & retail | 2024 |
| Main Trader Ltd | Wholesale & retail | 2023 |
| Mainerag Limited | Transport & logistics | 2020 |
| Maipop Farm Limited | Agriculture & fishing | 2015 |
| Maison DE Reve Limited | Real estate | 2022 |
| Majestic Build Group Limited | Construction | 2024 |
| Makrogama Ltd | Energy | 2021 |