| Lincs GRP Roofing Ltd | Construction | 2025 |
| Lincs Medical Consultations Limited | Health & social care | 2021 |
| Lincs Plant Limited | Manufacturing | 2025 |
| Lincs Plant Sales Ltd | Manufacturing | 2025 |
| Lincs Prime Flat Roofing Ltd | Manufacturing | 2024 |
| Lincs Properties Ltd | Real estate | 2014 |
| Lincs Trading Limited | Extraterritorial | 2015 |
| Lincs Window & Doors Ltd | Wholesale & retail | 2016 |
| Lincs-Pl Limited | Wholesale & retail | 2016 |
| Lincsheart Ltd | Health & social care | 2025 |
| Lincweb Design Limited | Information & communication | 2010 |
| Linden Court (Boston) Management Company Limited | Administrative & support | 2014 |
| Linden Way Green Limited | Other services | 1981 |
| Linksbuild Ltd | Construction | 2023 |
| Linx Flooring Ltd | Wholesale & retail | 2020 |
| Linx Way Ltd | Hospitality | 2017 |
| Lion Plants (Fishtoft) Ltd | Agriculture & fishing | 2001 |
| Lion Rouge Windows Limited | Manufacturing | 2005 |
| LIT Style Ltd | Other services | 2023 |
| Lithuania Garage Limited | Wholesale & retail | 2020 |
| Lithuanian Garage Limited | Wholesale & retail | 2017 |
| Little Bear Posterity Co Ltd | Other services | 2026 |
| Little Lions Nursery Limited | Health & social care | 2015 |
| Little Pelicans Ltd | Health & social care | 2025 |
| Little Seedlings Childcare Limited | Health & social care | 2025 |
| LJ Resources Limited | Administrative & support | 2018 |
| Ljsolutions Ltd | Construction | 2025 |
| Lloyds&Elsvee Private Limited | Administrative & support | 2023 |
| Llrth Ltd | Other services | 2023 |
| LO Property Boston Ltd | Real estate | 2026 |
| LO Transport (Boston) Ltd | Transport & logistics | 2020 |
| Local Lead Generation Ltd | Professional & scientific | 2021 |
| Locked and Secure Ltd | Administrative & support | 2013 |
| Locksley Close Limited | Real estate | 1999 |
| Lodge Capital Ltd | Real estate | 2019 |
| Lodge Cater Ltd | Hospitality | 2023 |
| Lodge Fabrications Limited | Manufacturing | 1996 |
| Logic Signals Ltd | Information & communication | 2023 |
| Loginexa Limited | Transport & logistics | 2026 |
| Logtech Ltd | Manufacturing | 2021 |
| Lois Dwellings Ltd | Households | 2023 |
| Lokys Transport Limited | Transport & logistics | 2018 |
| Lolabud Ltd | Wholesale & retail | 2023 |
| Lolisans Limited | Wholesale & retail | 2026 |
| London & North Eastern Investments Limited | Real estate | 2012 |
| London Move Limited | Transport & logistics | 2017 |
| Loscoe Bites Ltd | Hospitality | 2025 |
| Loucia Limited | Construction | 2022 |
| Love Beauty by Sonja & Co Ltd | Other services | 2019 |
| Love Hair by Sonja & Co Ltd | Other services | 2013 |
| Love YA Limited | Extraterritorial | 2007 |
| Lovely Lawns Ltd | Administrative & support | 2025 |
| Lowe City Ltd | Extraterritorial | 2025 |
| LP SD One Hundred Eighteen Limited | Wholesale & retail | 2023 |
| LPC Engineering Ltd | Manufacturing | 2012 |
| LQ Global Ventures Limited | Wholesale & retail | 2026 |
| LRS Car & Light Commercial Repair Specialist Ltd | Manufacturing | 2013 |
| LRS Property Ltd | Extraterritorial | 2022 |
| LS Engineering (Boston) Limited | Professional & scientific | 2019 |
| LTB Property Ltd | Real estate | 2021 |
| Lteddie Ltd | Transport & logistics | 2022 |
| Lucabo International Limited | Manufacturing | 2022 |
| Lugtoncourt Limited | Financial services | 1973 |
| Lukasz Labour Limited | Administrative & support | 2016 |
| Lukna Ltd | Transport & logistics | 2025 |
| Lukora Ltd | Transport & logistics | 2018 |
| Lunita Boutique Ltd | Wholesale & retail | 2026 |
| Lure Lounge Ltd | Wholesale & retail | 2020 |
| Luxora Bathrooms Ltd | Construction | 2026 |
| Lynn Couriers Limited | Transport & logistics | 2018 |
| Lynx Bowling Ltd | Construction | 2018 |
| Lynx Cars Ltd | Transport & logistics | 2024 |
| Lynx Engineers Limited | Construction | 2013 |
| M & a (Lincoln) Ltd | Construction | 2009 |
| M & I Hladun & SON Ltd | Agriculture & fishing | 2011 |
| M & S Jewellers (Sleaford) Limited | Wholesale & retail | 1997 |
| M a Cooper TSP Ltd | Transport & logistics | 2013 |
| M a Crane Electrical Ltd | Construction | 2025 |
| M and G Care Limited | Health & social care | 2017 |
| M and J Fencing and Gates Ltd | Manufacturing | 2024 |
| M Buck Practice Management Limited | Administrative & support | 2013 |
| M J Codd Consultancy Ltd | Professional & scientific | 2025 |
| M John Solutions Ltd | Professional & scientific | 2009 |
| M&B Engineering (Stockport) Ltd | Professional & scientific | 2022 |
| M&G Trade Limited | Wholesale & retail | 2015 |
| M-Real UK Pension Trustees Limited | Administrative & support | 2007 |
| M. Leggate & Sons (Produce) Limited | Agriculture & fishing | 1978 |
| M. T. R. M. Limited | Arts & recreation | 2001 |
| M.Baker Produce Limited | Agriculture & fishing | 1971 |
| M.G.Dales Joinery Limited | Construction | 2010 |
| M.H. Simpson (Agricultural Contractors) Ltd | | 1989 |
| M.S. Agricultural Services Ltd | Administrative & support | 2002 |
| M16 Services UK Ltd | Construction | 2025 |
| M3 Enterprises Ltd | Health & social care | 2019 |
| M5 Multi Services Ltd | Professional & scientific | 2021 |
| MA Triumph Ltd | Extraterritorial | 2025 |
| MAC Motor Repairs & Bodyshop Ltd | Manufacturing | 2014 |
| Machakov Limited | Construction | 2023 |
| Maciejman Ltd | Extraterritorial | 2016 |
| Macro Accountancy Ltd | Professional & scientific | 2018 |