| Loosegate Plant Hire Limited | Administrative & support | 2018 |
| Lord Collectables Limited | Wholesale & retail | 2007 |
| Lord Home Improvements Ltd | Construction | 2025 |
| Lordegold Ltd | Wholesale & retail | 2021 |
| Loredanny Boutique Limited | Wholesale & retail | 2023 |
| LOU Teasdale Limited | Other services | 2014 |
| Louis Greetham Plumbing & Heating Ltd | Construction | 2024 |
| Love to SEW Ltd | Wholesale & retail | 2013 |
| Love, Delivered Ltd | Wholesale & retail | 2020 |
| Lovedale Contracts Ltd | Construction | 2008 |
| Lowgate Developments Limited | Construction | 2020 |
| LP GAS (Lincs) Limited | Wholesale & retail | 2022 |
| LPS Investments Limited | Real estate | 2026 |
| LR Consultancy (HR Services) Ltd | Administrative & support | 2021 |
| LRM Horticultural Services Limited | Administrative & support | 2013 |
| LS Commercial Vehicle Repairs Ltd | Wholesale & retail | 2023 |
| LS Engineering (Lincs) Ltd | Professional & scientific | 2022 |
| LS Property Management Services Ltd | Households | 2026 |
| LS Property Ventures Limited | Wholesale & retail | 2023 |
| Lskw Ltd | Transport & logistics | 2021 |
| Lspptransport Ltd | Transport & logistics | 2015 |
| LT Autoworks Ltd | Wholesale & retail | 2026 |
| LT Electrical Services Ltd | Construction | 2022 |
| Ltdrive Ltd | Transport & logistics | 2018 |
| Lubbe & Sons (Bulbs) Limited | Wholesale & retail | 1965 |
| Lucent Projects Ltd | Professional & scientific | 2015 |
| Lucksbridge Horticulture Limited | Agriculture & fishing | 2008 |
| Lucksbridge Marketing Limited | Professional & scientific | 2018 |
| Lucky Bay Ltd | Information & communication | 2019 |
| Lucky Chinese Takeaway Ltd | Hospitality | 2025 |
| Lucy LOO Hire Ltd | Administrative & support | 2023 |
| Ludo Transport Ltd | Transport & logistics | 2019 |
| Lugomove Ltd | Transport & logistics | 2025 |
| Lukasz Walczynski Limited | Transport & logistics | 2021 |
| Lukaszuk Services Ltd | Transport & logistics | 2019 |
| Lukmar Transport Ltd | Administrative & support | 2026 |
| Lumen Living Limited | Construction | 2026 |
| Lumio Design Ltd | Manufacturing | 2025 |
| Lunak Wheels Ltd | Construction | 2026 |
| Lunns Haulage Ltd | Transport & logistics | 2014 |
| LUS Company Ltd | Transport & logistics | 2026 |
| LUX Auto Tint Limited | Wholesale & retail | 2018 |
| LUX UK (Lincs) Ltd | Construction | 2025 |
| Luxuk Humberside Ltd | Construction | 2022 |
| Luxuk Ltd | Construction | 2021 |
| Luxury Roof Care Limited | Construction | 2026 |
| Luzenczyk Logistic Ltd | Transport & logistics | 2015 |
| LVM Cleaning and Maintenance Ltd | Administrative & support | 2025 |
| LW Property Maintenance Ltd | Construction | 2020 |
| Lwsa Ltd | Administrative & support | 2016 |
| Lyme Bay Solutions Ltd | Wholesale & retail | 2014 |
| Lynas Vokes Holdings Limited | Financial services | 2025 |
| Lynas Vokes Professional Services Limited | Professional & scientific | 2026 |
| Lynas Vokes Property Developments Limited | Administrative & support | 2012 |
| M & a Fabrication Limited | Construction | 2002 |
| M & JB Limited | Hospitality | 2024 |
| M & John Trans Ltd | Transport & logistics | 2025 |
| M a Thacker Builder Ltd | Construction | 2022 |
| M Bacon Plant Hire Limited | Administrative & support | 2011 |
| M Barnett & SON Limited | Construction | 2022 |
| M Goodale Ltd | Construction | 2012 |
| M J Gent Farms Limited | Agriculture & fishing | 2010 |
| M J Safety Limited | Administrative & support | 2007 |
| M J Sullivan & Sons Limited | Construction | 2025 |
| M L Smith & Sons Ltd | Agriculture & fishing | 2011 |
| M Parker & Sons "Ship" Ltd | Hospitality | 2017 |
| M V Necula Limited | Transport & logistics | 2014 |
| M&A Truck & Plant Limited | Other services | 2022 |
| M&M Auctions Ltd | Wholesale & retail | 2018 |
| M&M Lincs Investments Limited | Financial services | 2026 |
| M&S Cookson Holdings Limited | Financial services | 2023 |
| M&W.A16PALLETS Ltd | Agriculture & fishing | 2025 |
| M. Parker & Sons Limited | Construction | 1986 |
| M. Stevens Building & Roofing Limited | Construction | 2015 |
| M.Alex-Trans Ltd | Transport & logistics | 2014 |
| M.D KOV Ltd | Transport & logistics | 2023 |
| M.I.G Trans Limited | Transport & logistics | 2011 |
| M.P.Baker Limited | Transport & logistics | 2004 |
| M.P.T. Logistics (Lincs) Ltd | Transport & logistics | 2022 |
| MA BLU Print Limited | Health & social care | 2021 |
| Ma&Ma Trans Ltd | Transport & logistics | 2016 |
| Ma-Truck Ltd | Administrative & support | 2015 |
| Maani Elite Services Limited | Administrative & support | 2014 |
| MAB Flowers Limited | Agriculture & fishing | 2018 |
| Mabosrl Ltd | Transport & logistics | 2021 |
| Macleod Engineering Management Ltd | Professional & scientific | 2015 |
| Madasipo Care Ltd | Health & social care | 2014 |
| Maddison Pantomimes Limited | Financial services | 2023 |
| Mador Transport Ltd | Transport & logistics | 2016 |
| Madwood Engineering (Spalding) Ltd | Manufacturing | 2025 |
| MAG Trans Ltd | Administrative & support | 2016 |
| Magnus Fluxus Digital Ltd | Professional & scientific | 2025 |
| Maher's Autos Limited | Wholesale & retail | 2024 |
| Maillardet Coffee Ltd | Wholesale & retail | 2020 |
| Mailostrans Ltd | Transport & logistics | 2024 |
| Main Line Railwayana Auctions Limited | Wholesale & retail | 2024 |
| Maison Mignon Consulting Ltd | Professional & scientific | 2025 |
| Majad Ltd | Health & social care | 2023 |
| Majan & Sons Co Ltd | Real estate | 2025 |
| Majestic Bingo Holdings Limited | Financial services | 2019 |