| LA Kitchen Collections Ltd | Construction | 2020 |
| LA VOX Limited | Professional & scientific | 2005 |
| Labyrinth Education Ltd | Extraterritorial | 2024 |
| LAC Groundworks Limited | Construction | 2011 |
| Ladybird Market Ltd | Wholesale & retail | 2024 |
| Lafunky Cuisine Kitchen Ltd | Hospitality | 2025 |
| Lakshmi 12 Limited | Financial services | 2016 |
| Lancewood Developments Ltd | Real estate | 2024 |
| Landleaf GP Limited | Real estate | 1999 |
| Landleaf Limited | Real estate | 1995 |
| Landymere View Ltd | Professional & scientific | 2023 |
| Lanes Contract Cleaning Ltd | Administrative & support | 2020 |
| Lanes Window Cleaning Ltd | Administrative & support | 2014 |
| Langsett Ltd | Administrative & support | 2020 |
| Languages for Life Limited | Education | 2007 |
| Largan Estates and Properties LLP | | 2023 |
| Largan Estates Limited | Real estate | 2020 |
| Largan Properties Limited | Real estate | 2023 |
| Large Model Aircraft Association Limited | Arts & recreation | 2018 |
| Latchly Ltd | Wholesale & retail | 2025 |
| Lattice Trading Limited | Financial services | 2013 |
| Laundry Bliss Limited | Other services | 2024 |
| Laura Longden Interiors Limited | Wholesale & retail | 2021 |
| Laurie's Logs Ltd | Wholesale & retail | 2026 |
| Lavean Ltd | Other services | 2021 |
| LDW Carpentry & Building Ltd | Construction | 2017 |
| Lead With Kairos Ltd | Professional & scientific | 2026 |
| Leavesley LLP | | 2007 |
| LEE Bladon Limited | Health & social care | 2018 |
| LEE Developments and Lettings Limited | Construction | 2012 |
| LEE Dobson Interiors Ltd | Construction | 2014 |
| LEE Winters Building Services Ltd | Construction | 2020 |
| Leeming Investments Limited | Financial services | 2009 |
| Leisurebench Limited | Wholesale & retail | 2004 |
| Leisuresk Limited | Other services | 2020 |
| Lesley Jenkins LLP | | 2006 |
| Leslie Oak Investments Ltd | Financial services | 2026 |
| Leslie Oak Property Limited | Real estate | 2020 |
| Leviathan Underwriting Limited | Financial services | 1993 |
| Lewicki Properties Ltd | Households | 2024 |
| LG Rising Trades Ltd | Financial services | 2026 |
| Lieefes Ltd | Wholesale & retail | 2021 |
| Life in Pictures Ltd | Information & communication | 2007 |
| Lifecoat Limited | Manufacturing | 2024 |
| Lifestyle by Coral James Limited | Real estate | 2021 |
| Lightfoot Group Limited | Financial services | 2017 |
| Lightning 2023 Limited | Real estate | 2023 |
| Lightning Property 2023 Limited | Real estate | 2023 |
| Lily Rose Property Services Ltd | Real estate | 2024 |
| Lime Tree Music Media Ltd | Arts & recreation | 2018 |
| Limespan Ltd | Other services | 2024 |
| Lincoln & District Sailing Association Limited | Education | 2005 |
| Lincolnshire Commercials Ltd | Wholesale & retail | 2023 |
| Lincolnshire Foods Limited | Wholesale & retail | 2025 |
| Lincolnshire Glamping Limited | Hospitality | 2017 |
| Lincolnshire Plant Supports Ltd | Manufacturing | 2021 |
| Lincolnshire Security Products Ltd | Manufacturing | 2024 |
| Lincolnshire Traders Limited | Wholesale & retail | 2023 |
| Lincolnshire Wrought Iron Ltd | Manufacturing | 2025 |
| Lincolnshire Youth Partnership C.I.C. | Wholesale & retail | 2026 |
| Lincs Catering & Business Solutions Ltd | Hospitality | 2022 |
| Lincs Momo Ltd | Hospitality | 2023 |
| Lincsinn Limited | Hospitality | 2023 |
| Lincsmobilesmiles Ltd | Health & social care | 2022 |
| Lindas Group Ltd | Construction | 2021 |
| Lindpet Investments Ltd | Real estate | 2016 |
| Lindpet Ltd | Financial services | 2021 |
| Lingrain Marketing Limited | Agriculture & fishing | 1973 |
| Lingrain Services Limited | Agriculture & fishing | 1983 |
| Link Beau Ltd | Real estate | 2013 |
| Link Magazines Limited | Information & communication | 2007 |
| Linked Property Ltd | Real estate | 2019 |
| Lionfish Ltd | Information & communication | 2025 |
| Lions Environmental Limited | Construction | 2023 |
| Lirkel Developments Limited | Construction | 2016 |
| Lisan LLP | | 2006 |
| Lisa’S Salon Ltd | Other services | 2023 |
| Listan Paper Converters Limited | Manufacturing | 1981 |
| LIT Ocean Clothings Ltd | Wholesale & retail | 2024 |
| Little Active Kids Limited | Wholesale & retail | 2011 |
| Little Brick LLP | | 2008 |
| Little Nellie's Ltd | Health & social care | 2025 |
| Little Skiers Ltd | Wholesale & retail | 2014 |
| Little Sparrow Business Services Limited | Professional & scientific | 2025 |
| Little Village Bakery Limited | Manufacturing | 2025 |
| Living by Nature UK Limited | Education | 2025 |
| Living With Autism (Group) Limited | Health & social care | 2012 |
| Lizzie KAY Design Ltd | Wholesale & retail | 2020 |
| LJ Builders Lincs Ltd | Construction | 2024 |
| LJ Property Maintenance Ltd | Construction | 2025 |
| LJW Crusher Hire Ltd | Administrative & support | 2021 |
| LKR Construction Limited | Construction | 2025 |
| LL Payroll & Consultancy Services Ltd | Professional & scientific | 2026 |
| LM Property Improvements Limited | Construction | 2022 |
| LMC Transport Management & Training Ltd | Professional & scientific | 2017 |
| LMD Technical Ltd | Administrative & support | 2012 |
| Localadd Ltd | Transport & logistics | 2020 |
| Lochs & Fens Ltd | Manufacturing | 2018 |
| Locool Services Limited | Manufacturing | 2013 |
| Lodge Fossils Ltd | Administrative & support | 2016 |