| L & R Landscaping and Joinery Ltd | Administrative & support | 2022 |
| L Beastall Ltd | Mining & quarrying | 2024 |
| L C & M Holdings Limited | Administrative & support | 2009 |
| L C & M Limited | Manufacturing | 2003 |
| L E Contractors Limited | Construction | 2012 |
| L E P Developments Limited | Construction | 2014 |
| L Forbes Ltd | Real estate | 2023 |
| L G Daniels Ltd | Wholesale & retail | 2012 |
| L J Mechanical Handling Ltd | Professional & scientific | 2022 |
| L J Sims Building & Maintenance Services Ltd | Construction | 2017 |
| L J Sims Properties Ltd | Real estate | 2018 |
| L Taylor Building Limited | Construction | 2025 |
| L&P Real Estate Lettings Limited | Real estate | 2022 |
| L&W Technologies Ltd | Information & communication | 2021 |
| L-Brix Ltd | Wholesale & retail | 2015 |
| L-Tech Engineering Ltd | Manufacturing | 2011 |
| L. G. Services Ltd | Transport & logistics | 2023 |
| L.A Roofing Ltd | Construction | 2025 |
| L.A. Productions 4 Ltd | Arts & recreation | 2024 |
| L.A.B. Planning Services Limited | Professional & scientific | 2015 |
| L.G.Maplethorpe Limited | Agriculture & fishing | 1956 |
| L.L.A. (Sales) Ltd. | Wholesale & retail | 1995 |
| L.M.P Studios Ltd | Information & communication | 2016 |
| L.P. Drylining Ltd | Construction | 2018 |
| L.T.Hardy Distributions Ltd | Wholesale & retail | 2024 |
| LA Bella DI Casa Limited | Hospitality | 2023 |
| LA Collective Limited | Wholesale & retail | 2025 |
| LA Nena Luna Ltd | Wholesale & retail | 2024 |
| LA Reine Label Ltd | Professional & scientific | 2026 |
| La-Dee's Care Solution Ltd | Administrative & support | 2021 |
| LAB ( Europe ) Sanitary Fittings Limited | Wholesale & retail | 2005 |
| Lacey Estates Ltd | Real estate | 2024 |
| Lacey Management Systems Ltd | Professional & scientific | 2018 |
| Laceys View Property Ltd | Real estate | 2020 |
| Lachesis Eunomia Ltd | Health & social care | 2024 |
| Lackafer LLP | | 2023 |
| Lackland & Co. Limited | Wholesale & retail | 2008 |
| Lacy Consulting Limited | Information & communication | 2014 |
| Lada Entertainment Ltd | Arts & recreation | 2008 |
| Lagat Limited | Education | 1987 |
| Lagi House Ltd | Hospitality | 2025 |
| LAH Design Consulting Ltd | Information & communication | 2014 |
| Laing Building Services Ltd | Real estate | 2023 |
| Laing Properties (Lincoln) | Construction | 2020 |
| Laing Properties (Lincs) Ltd | Real estate | 2020 |
| Lajkonik Lincoln Ltd | Wholesale & retail | 2025 |
| Lake of Stars Ltd | Health & social care | 2024 |
| Lake Shore Capital Limited | Financial services | 2014 |
| Lakeside Plumbing and Heating Ltd | Construction | 2020 |
| Lalabel Ltd | Health & social care | 2017 |
| Lalabel Properties Ltd | Real estate | 2024 |
| Lambert IT Ltd | Information & communication | 2014 |
| Lambley Enterprises Limited | Construction | 1988 |
| Lamie 1 Ltd | Hospitality | 2021 |
| Lamming Electrical Ltd | Construction | 2024 |
| Lamond Wills Limited | Financial services | 2023 |
| Lamorna Developments Ltd | Construction | 2024 |
| Lamyman Pressure Washing Services Limited | Administrative & support | 2006 |
| Lancia Property Ltd | Real estate | 2022 |
| Land & Development Consultants Limited | Professional & scientific | 2004 |
| Land and Leaf Collective Community Interest Company | Education | 2021 |
| Landermeads Group Limited | Financial services | 2021 |
| Landermeads Limited | Other services | 1987 |
| Landignis Ltd | Real estate | 2023 |
| Landtrade Security Paper Services Limited | Wholesale & retail | 2001 |
| Lane 7 Marketing Ltd | Professional & scientific | 2019 |
| Langar Nursery Ltd | Health & social care | 2025 |
| Langdon Commodities Limited | Other services | 2018 |
| Langley House Ventures Ltd | Administrative & support | 2026 |
| Langton Green Management Company Limited | Households | 2013 |
| Langworth Property Limited | Real estate | 2017 |
| Langworthgate Apartments Limited | Real estate | 2014 |
| Langworthgate Management Company Limited | Real estate | 2014 |
| Lanlabs Limited | Real estate | 2020 |
| LAP Safety Services Limited | Administrative & support | 2025 |
| Lapwing Film Limited | Information & communication | 2020 |
| Laq-Aga Ltd | Health & social care | 2022 |
| Large Art Productions Ltd. | Information & communication | 2016 |
| Laris Ltd | Hospitality | 2019 |
| Lascom Technologies UK Ltd | Information & communication | 2024 |
| Lashes by Jamielee Ltd | Wholesale & retail | 2025 |
| Laspalla Limited | Health & social care | 2010 |
| Lastrix Developments Ltd | Construction | 2026 |
| Lateral Logic Limited | Professional & scientific | 2003 |
| Latusko Limited | Transport & logistics | 2016 |
| Latvian Street Feast Ltd | Hospitality | 2025 |
| Launchpad Operations Ltd | Administrative & support | 2026 |
| Laura Hazell Osteopathy Limited | Health & social care | 2021 |
| Laura Jayne's Ltd | Wholesale & retail | 2019 |
| Laura Pearson Homes & Mortgages Ltd | Financial services | 2019 |
| Laureate House Ltd | Real estate | 2018 |
| Laurel Developments Limited | Construction | 2020 |
| Lauren Green Consultancy Limited | Professional & scientific | 2025 |
| Lauren Todd Consultant Ltd | Professional & scientific | 2021 |
| Lava Marketing Communications Ltd | Professional & scientific | 2006 |
| Law Adjusters Ltd | Extraterritorial | 2012 |
| Lawless Civils Limited | Construction | 2009 |
| Lawnsmith Limited | Wholesale & retail | 2003 |
| Lawrence House (Lincoln) Management Company Limited | Real estate | 2011 |
| Lawretta Properties Ltd | Real estate | 2019 |