| Lincolnshire Cabinet Makers Limited | Manufacturing | 2011 |
| Lincolnshire Engines Ltd | Wholesale & retail | 2026 |
| Lincolnshire Fascias Limited | Construction | 2005 |
| Lincolnshire GAS Training Ltd | Education | 2021 |
| Lincolnshire House Association | Health & social care | 1988 |
| Lincolnshire Hydroponics Ltd | Wholesale & retail | 2025 |
| Lincolnshire Iron and Steel Institute Limited(The) | Professional & scientific | 1970 |
| Lincolnshire Lakes Limited | Construction | 2001 |
| Lincolnshire Office Solutions Ltd | Wholesale & retail | 2020 |
| Lincolnshire Organics Limited | Agriculture & fishing | 2000 |
| Lincolnshire Stoves Ltd | Other services | 2014 |
| Lincs Automation Limited | Professional & scientific | 2020 |
| Lincs Cool Ltd | Manufacturing | 2018 |
| Lincs Eco Group Ltd | Water & waste | 2026 |
| Lincs Electrical Limited | Manufacturing | 2017 |
| Lincs Ironmasters Limited | Manufacturing | 2001 |
| Lincs Lifting Limited | Administrative & support | 2005 |
| Lincs Motorcycle Breakers Ltd. | Wholesale & retail | 2017 |
| Lincs Property Management Limited | Households | 2018 |
| Lincs Property Residential Limited | Real estate | 2025 |
| Lincson Bespoke Renovations Ltd | Construction | 2023 |
| Lincson Ltd | Construction | 2013 |
| Lindsey Catering Co. Limited | Real estate | 1959 |
| Lindsey Hotel (Scunthorpe) Limited | Hospitality | 2023 |
| Lindsey Lodge Limited | Health & social care | 1989 |
| Link Cold Refrigeration & Air Conditioning Co Limited | Manufacturing | 2001 |
| LINKCAR4U Limited | Other services | 2018 |
| Linq Properties Ltd | Hospitality | 2025 |
| Liquid Latex Direct Limited | Wholesale & retail | 2020 |
| Liquid Mist Ltd | Wholesale & retail | 2024 |
| Liquid X Waterless Manufacturing Ltd | Manufacturing | 2025 |
| List Design Limited | Professional & scientific | 1986 |
| List Group PLC | Professional & scientific | 1976 |
| List PEC (UK) Limited | Professional & scientific | 1989 |
| List Recruitment Limited | Administrative & support | 1976 |
| Litco Ltd | Administrative & support | 2016 |
| Lithe Housing Limited | Real estate | 2025 |
| Little Frogs Daycare Ltd | Health & social care | 2017 |
| Little Owls (Scunthorpe) Limited | Health & social care | 2014 |
| Little Sunflowers Limited | Health & social care | 2022 |
| Little Tots Nursery (Scunthorpe) Ltd | Administrative & support | 2016 |
| Live Stream Data Systems Limited | Information & communication | 2016 |
| Liveline Electrical Services Ltd | Construction | 2025 |
| Livinaya Limited | Health & social care | 2022 |
| Living Good Properties Ltd | Real estate | 2023 |
| Liviu Procars Detailing Ltd | Wholesale & retail | 2026 |
| Lixx Desserts Limited | Hospitality | 2019 |
| LJ Contracting Ltd | Construction | 2025 |
| LJH Construction & Training Services Ltd | Construction | 2024 |
| LJR Medical Ltd | Health & social care | 2021 |
| LJT Property Management Limited | Households | 2021 |
| Lkarpas Limited | Transport & logistics | 2018 |
| LKD Properties Limited | Households | 2022 |
| Lloyds Court Limited | Hospitality | 2021 |
| LMD Cars Sales Ltd | Wholesale & retail | 2025 |
| LMJ Creative Ltd | Information & communication | 2024 |
| LMR Welding Ltd | Professional & scientific | 2019 |
| LN Automotives Ltd | Wholesale & retail | 2025 |
| LN Commercial Property Lets Limited | Real estate | 2015 |
| LN Residential Property Lets Limited | Real estate | 2021 |
| Local Builds Limited | Construction | 2024 |
| Local Stop Ltd | Wholesale & retail | 2026 |
| Locked UP Storage Limited | Administrative & support | 2024 |
| Lodgix. Limited | Information & communication | 2008 |
| Loky Fashion Ltd | Wholesale & retail | 2021 |
| Lola Transport Ltd | Transport & logistics | 2022 |
| Lola's Pet Beds Limited | Wholesale & retail | 2015 |
| Lolu Alloys Limited | Wholesale & retail | 2017 |
| Lonan Country House and Gardens Ltd | Hospitality | 2023 |
| London Dermatology & Radiology Limited | Health & social care | 2022 |
| London GA Locums Limited | Health & social care | 2022 |
| London Light UP Limited | Wholesale & retail | 2021 |
| London Paediatrics Limited | Health & social care | 2014 |
| Long Game Lettings Ltd | Real estate | 2018 |
| Looscore Limited | Information & communication | 2026 |
| Looza Ltd | Wholesale & retail | 2024 |
| Louise Oliver Properties Limited | Real estate | 2019 |
| Lovemaths Tutoring UK Ltd | Education | 2021 |
| Lowden Distribution Brokers Limited | Other services | 2013 |
| Lowgate Assets Limited | Construction | 2019 |
| LPD Driving School Ltd | Education | 2019 |
| LPD Franchising Limited | Professional & scientific | 2024 |
| LR Properties 365 Ltd | Real estate | 2024 |
| Lsbs Anaesthetics Limited | Health & social care | 2024 |
| LT Capital Shop Ltd | Wholesale & retail | 2024 |
| Lucas and NEL Limited | Information & communication | 2010 |
| Luisa Transport Ltd | Transport & logistics | 2026 |
| Lukejacksonn Ltd | Information & communication | 2020 |
| Lumiluxe Ltd | Other services | 2023 |
| Luminari Timepieces Ltd | Wholesale & retail | 2026 |
| Luna Mortgages Ltd | Financial services | 2019 |
| Lunar Management Ltd | Extraterritorial | 2013 |
| Lungmatters Limited | Health & social care | 2023 |
| Lurking Studios Limited | Information & communication | 2024 |
| Luvmypad Limited | Manufacturing | 2012 |
| LVV Services (Humberside) Ltd | Wholesale & retail | 2011 |
| Lysdar Ltd | Transport & logistics | 2024 |
| M & J Pubs Ltd | Hospitality | 2015 |
| M & S Oades Transport Ltd | Transport & logistics | 2014 |
| M - KOI Ltd | Wholesale & retail | 2018 |