| KB IT Services Ltd | Information & communication | 2026 |
| KB Telecommunications Ltd | Construction | 2024 |
| KC Poodles Ltd | Professional & scientific | 2020 |
| KDM Services Handyman Ltd | Construction | 2022 |
| KDR Motors Ltd | Wholesale & retail | 2015 |
| KE Consulting Services Ltd | Administrative & support | 2022 |
| Keitch Ltd | Administrative & support | 2020 |
| Kenbal Homes Ltd | Real estate | 2021 |
| Kesteven Consulting Ltd | Professional & scientific | 2024 |
| Kesteven Energy Ltd | Energy | 2022 |
| KEV Greatrix Plumbing & Heating Ltd | Construction | 2019 |
| KF Developments Ltd | Construction | 2013 |
| KID & Play Trading Limited | Education | 2018 |
| Kiddiewinx Childcare Ltd | Other services | 2014 |
| Kingfisher Brickwork Limited | Construction | 2026 |
| Kingswood Dental Ltd | Health & social care | 2021 |
| Kirkby LA Thorpe Church of England Primary Academy | Education | 2013 |
| Kirmizi Red Limited | Wholesale & retail | 2019 |
| Kittiwake Holidays Ltd | Hospitality | 2019 |
| KJ Pinnacle Projects Ltd | Professional & scientific | 2025 |
| KLC Consulting Limited | Professional & scientific | 2007 |
| KM Motors Trade Ltd | Wholesale & retail | 2024 |
| KMM Digital Solutions Limited | Information & communication | 2025 |
| Knight Construction Ltd | Construction | 2023 |
| Knowledge Plus Information Ltd | Education | 2013 |
| Koffmann's Foods Limited | Hospitality | 2020 |
| KPK 19 Ltd | Hospitality | 2019 |
| Kraus Enterprises Ltd | Administrative & support | 2021 |
| Kronowerx Ltd | Information & communication | 2012 |
| Kwaremont Payroll Ltd | Information & communication | 2025 |
| Kyle Allison Consulting Limited | Administrative & support | 2023 |
| Kyme Heating Ltd | Construction | 2021 |
| Kyme Services Ltd | Wholesale & retail | 2013 |
| L.C. Friend Ltd | Construction | 2023 |
| LA Bella Vita Restaurant Ltd | Hospitality | 2026 |
| LA Royale Cromwell Ltd | Administrative & support | 2016 |
| Lacibus Ltd | Information & communication | 2017 |
| Ladybird Homes & Construction Limited | Construction | 2019 |
| Ladybird Homes & Construction Services Ltd | Construction | 2020 |
| Ladysmith Developments Ltd | Construction | 2010 |
| Lafford Homes Limited | Construction | 2016 |
| Lambean Property Ltd | Real estate | 2021 |
| Lancashire Parks Limited | Hospitality | 2007 |
| Langstaff Property Developments UK Limited | Construction | 2015 |
| Laurel Grove (Silk Willoughby) Management Company Limited | Households | 2024 |
| Law's Transport Limited | Administrative & support | 2001 |
| Lc&T Care Limited | Health & social care | 2024 |
| LD Bird Automotive Ltd | Wholesale & retail | 2025 |
| Leadtone Limited | Agriculture & fishing | 1985 |
| Leah Kirkman Ltd | Education | 2014 |
| Learn to Enterprises Limited | Information & communication | 2011 |
| Ledor Automation Ltd | Construction | 2026 |
| Leggett Civils Ltd | Administrative & support | 2019 |
| Leinad (Lincolnshire) Limited | Administrative & support | 2010 |
| Lenav Ltd | Health & social care | 2019 |
| Lewis Wells Limited | Real estate | 1958 |
| LGC Property Ltd | Real estate | 2024 |
| Life in Action Limited | Information & communication | 2017 |
| Lifestyle Physiotherapy and Sports Injury Clinic Ltd | Other services | 2015 |
| Lillybertie Ltd | Professional & scientific | 2011 |
| Lime Tree Path Ltd | Professional & scientific | 2018 |
| Limeco (Midlands) Limited | Agriculture & fishing | 2000 |
| Limonta Smith JV Limited | Construction | 2010 |
| Lincolnshire 4X4 Response Limited | Health & social care | 2012 |
| Lincolnshire County Cricket Ltd | Arts & recreation | 2009 |
| Lincolnshire Fastener Co. Ltd | Wholesale & retail | 2008 |
| Lincolnshire Fire Services Ltd | Financial services | 2018 |
| Lincolnshire Horticulture (Farms) Limited | Agriculture & fishing | 2025 |
| Lincolnshire Horticulture Limited | Financial services | 2020 |
| Lincolnshire House Renovations Limited | Real estate | 2023 |
| Lincolnshire Land Company Limited | Construction | 2021 |
| Lincolnshire Mental Health Consultancy Ltd | Health & social care | 2024 |
| Lincolnshire PIG Company Ltd | Agriculture & fishing | 2016 |
| Lincs Catering Ltd | Construction | 2018 |
| Lincs Indian Society Community Interest Company | Information & communication | 2018 |
| Lincs Lofts Limited | Construction | 2022 |
| Lincs Renovations Limited | Construction | 2022 |
| Lincs Town Planning Services Limited | Professional & scientific | 2021 |
| LINCS2LET Ltd | Real estate | 2013 |
| Lindensium Homes Ltd | Construction | 2022 |
| Lindissi CIC | Arts & recreation | 2022 |
| Lindsey Care Limited | Administrative & support | 2024 |
| Lindsey Energy (Lincolnshire) Limited | Energy | 2017 |
| Lions Cafe & Restaurant Ltd | Hospitality | 2024 |
| Lions Group Ltd | Hospitality | 2019 |
| Little Bird Aesthetics Limited | Other services | 2025 |
| Little Crafters Boxes Ltd | Manufacturing | 2021 |
| Little Hearts Childminding Ltd | Health & social care | 2026 |
| Little Oven Bakehouse Ltd | Manufacturing | 2025 |
| LIV Holdings Ltd | Extraterritorial | 2022 |
| Llcr Group Ltd | Hospitality | 2026 |
| Llcr Ltd | Information & communication | 2024 |
| LME & SON Properties Ltd | Real estate | 2026 |
| LME Building Contractors Ltd | Construction | 2023 |
| Lme-Build Ltd | Construction | 2026 |
| Lme-Estimating Ltd | Professional & scientific | 2024 |
| Lmrap Holdings Limited | Financial services | 2021 |
| LN12 CIC | Information & communication | 2021 |
| Lodestar Services Ltd | Professional & scientific | 2024 |
| Loler Inspection and Thorough Examination Limited | Professional & scientific | 2012 |