| LCS Group Limited | Information & communication | 1994 |
| LCW Installation Limited | Construction | 2023 |
| LDH Plumbing & Heating Limited | Construction | 2013 |
| LE Karate Academy Ltd | Arts & recreation | 2017 |
| Leader Customs Ltd | Wholesale & retail | 2022 |
| Leads 2 Appointments Ltd | Professional & scientific | 2016 |
| Leaking Boot Limited | Hospitality | 2013 |
| LEARNING4LIFE-ADULTS Limited | Education | 2025 |
| LEARNING4LIFE-GY CIC | Education | 2019 |
| Leasegevity Limited | Information & communication | 2018 |
| LEC & I Ltd | Professional & scientific | 2014 |
| Lecex Electrotechnical Services Ltd | Construction | 2022 |
| Lecson Ltd | Construction | 2023 |
| LED Central Limited | Wholesale & retail | 2015 |
| LED Ventures (Louth) Limited | Wholesale & retail | 2015 |
| LED Ventures Limited | Wholesale & retail | 2014 |
| Ledbury Fabrication & Welding Ltd | Manufacturing | 2025 |
| LEE Humphries 3D Ltd | Information & communication | 2013 |
| LEE Smith Builders Limited | Construction | 2022 |
| LEE Travels Limited | Transport & logistics | 2014 |
| Leesa Burger Co Ltd | Hospitality | 2018 |
| Legal Eagle Couriers Ltd | Other services | 2021 |
| Leggs Lets & Property Management Ltd | Real estate | 2025 |
| Leggs Lets Property & Maintenance Ltd | Households | 2025 |
| Leicesterphoto Limited | Professional & scientific | 2013 |
| Leigh's Fresh Grimsby Fish Limited | Wholesale & retail | 2021 |
| Leinad-Truck Ltd | Transport & logistics | 2016 |
| Leisure Beats Limited | Administrative & support | 2025 |
| Leisuretech Lawns Limited | Administrative & support | 2012 |
| Leisuretow Limited | Wholesale & retail | 1997 |
| Lelacheur IT Consulting Ltd | Information & communication | 2020 |
| Lemontea Recruitment Ltd | Administrative & support | 2016 |
| Leniutrans Ltd | Transport & logistics | 2020 |
| Lenzing Fibers Grimsby Limited | Manufacturing | 2006 |
| Leon Newman Ltd | Construction | 2019 |
| Leonardos Pizzeria Limited | Hospitality | 2025 |
| Lessons in the Cloud Limited | Information & communication | 2024 |
| LET IT Online Limited | Real estate | 2022 |
| Lets Rock UK Limited | Manufacturing | 2005 |
| Leus Fresh Foods Ltd | Hospitality | 2024 |
| Levack Property Consultants Limited | Other services | 2020 |
| Lever Pullers Ltd | Manufacturing | 2024 |
| LEW Insulations Ltd | Construction | 2023 |
| LEW Properties Limited | Real estate | 2016 |
| Lewis & Chambers Properties Ltd | Households | 2016 |
| Lewis Engineering Services Ltd | Manufacturing | 2011 |
| Lewis Robinson Services Ltd | Professional & scientific | 2019 |
| Lexmore Associates Limited | Professional & scientific | 2017 |
| Leymas Services Ltd | Construction | 2011 |
| LGB Air Conditioning and Refrigeration Limited | Construction | 2017 |
| LGC Fabrications Limited | Manufacturing | 2019 |
| LGM Electrical Limited | Construction | 2016 |
| LHS Offshore Ltd | Transport & logistics | 2023 |
| Liam Clarke Mechanical Ltd | Professional & scientific | 2026 |
| Liane Burton Limited | Professional & scientific | 2012 |
| Liberty Rose (Film Make UP) Limited | Arts & recreation | 2017 |
| Libertyware Limited | Information & communication | 2017 |
| Licu Trans SRL Limited | Transport & logistics | 2025 |
| Lidcast Data Limited | Information & communication | 1990 |
| Life & Living Limited | Other services | 2018 |
| Life Joy Academy Ltd | Professional & scientific | 2017 |
| Life on the Line Louth Ltd | Wholesale & retail | 2025 |
| Life Time Ponds Ltd | Administrative & support | 2022 |
| Lifesky Limited | Hospitality | 2021 |
| Lifestyle Express Grimsby Limited | Wholesale & retail | 2010 |
| Lifestyle Landscaping and Tree Service Ltd | Administrative & support | 2022 |
| Lighthouse HR Solutions Limited | Administrative & support | 2017 |
| Lighthouse Ukco 6 (Treasury) Limited | Manufacturing | 2001 |
| Lightning GRP Limited | Manufacturing | 2004 |
| Lilliput Waste Disposal Ltd | Water & waste | 2019 |
| Lily Nails Lounge Ltd | Other services | 2017 |
| Lily T Limited | Wholesale & retail | 2007 |
| Lilys-Mias Cafe Ltd | Hospitality | 2017 |
| Limber Dog Park Ltd | Arts & recreation | 2025 |
| Lime Trans Ltd | Transport & logistics | 2017 |
| Lincoln Health Ltd | Wholesale & retail | 2025 |
| Lincolnshire Belting Services Limited | Manufacturing | 2002 |
| Lincolnshire Caravan Transport Limited | Transport & logistics | 2020 |
| Lincolnshire Chimney Services Ltd | Administrative & support | 2021 |
| Lincolnshire Coast Properties Ltd | Real estate | 2021 |
| Lincolnshire Competitions Limited | Information & communication | 2023 |
| Lincolnshire Decking Specialists Ltd | Construction | 2024 |
| Lincolnshire Energy Centre Limited | Construction | 2016 |
| Lincolnshire Environmental Limited | Professional & scientific | 2024 |
| Lincolnshire Events Limited | Manufacturing | 2012 |
| Lincolnshire Fruit & VEG (Wholesale) Limited | Wholesale & retail | 2015 |
| Lincolnshire Home Improvements Ltd | Construction | 2012 |
| Lincolnshire Martial Arts Academy Ltd | Arts & recreation | 2022 |
| Lincolnshire Medispa Ltd | Other services | 2024 |
| Lincolnshire Memorials Ltd | Other services | 2024 |
| Lincolnshire Office Friends Limited | Wholesale & retail | 2003 |
| Lincolnshire Refugee Doctor Project C.I.C. | Education | 2016 |
| Lincolnshire Rentals Ltd | Real estate | 2025 |
| Lincolnshire Roofing (Grimsby) Limited | Construction | 2024 |
| Lincolnshire Safety Solutions Ltd | Public administration | 2020 |
| Lincolnshire Site Services Ltd | Construction | 2014 |
| Lincolnshire Travel Club Limited | Administrative & support | 2016 |
| Lincolnshire Tree Services Ltd | Administrative & support | 2004 |
| Lincolnshire Tyres Ltd | Wholesale & retail | 2025 |
| Lincolnshire's Talent Competition Ltd | Arts & recreation | 2025 |