| KLD Hospitality Limited | Hospitality | 2022 |
| KM Caravan Hire Limited | Hospitality | 2019 |
| Knighton Lodge Limited | Hospitality | 2024 |
| Knowesgate Hotel Rushyford Limited | Hospitality | 2024 |
| Knowesgate Hotel Skegness 2 Limited | Hospitality | 2020 |
| Kognos HT Limited | Information & communication | 2026 |
| KOT Brand Limited | Wholesale & retail | 2025 |
| Kruzes Cafe Ltd | Hospitality | 2024 |
| LA Piazza Restaurant Limited | Hospitality | 2025 |
| Lakeside Leisure Limited | Wholesale & retail | 1974 |
| Lamyman Farming Company Limited | Agriculture & fishing | 2011 |
| Laura Bookkeeping&Administration Ltd | Professional & scientific | 2010 |
| Lawton App Development Limited | Information & communication | 2025 |
| Layzee Bears Limited | Wholesale & retail | 2006 |
| LC Turner Ltd | Real estate | 2025 |
| LEE Foley Electrical Lincs Ltd | Manufacturing | 2011 |
| LEE Garden Takeaway Skegness Ltd | Hospitality | 2023 |
| Leisure and More Ltd | Wholesale & retail | 2024 |
| Leisure Hotel Skegness Limited | Hospitality | 2021 |
| Leisure Industry Limited | Hospitality | 1989 |
| Leisure Point Limited | Administrative & support | 2026 |
| Leon Haulage Ltd | Transport & logistics | 2023 |
| Leon Lighting Limited | Wholesale & retail | 2006 |
| Lewis Hackett Golf Ltd | Arts & recreation | 2019 |
| Liberer UK Limited | Real estate | 2025 |
| Life’S INK Ltd | Information & communication | 2024 |
| Lilly's Tavern Ltd | Hospitality | 2025 |
| Lilywhites Football Club Limited | Arts & recreation | 2024 |
| Lincoln House (Skegness) Management Company Limited | Real estate | 2010 |
| Lincolnshire Caravan & Parks Limited | Hospitality | 2012 |
| Lincolnshire Chalkboards Ltd | Wholesale & retail | 2025 |
| Lincolnshire Coast Light Railway Company Limited | Arts & recreation | 1960 |
| Lincolnshire Coastal Cleaning Services Ltd | Administrative & support | 2026 |
| Lincolnshire Coastal Cottages Limited | Hospitality | 2021 |
| Lincolnshire Extreme Sports Association | Arts & recreation | 2006 |
| Lincolnshire Ltd | Real estate | 2019 |
| Lincs Remote Accounting Ltd | Professional & scientific | 2024 |
| Little Italy (Spilsby) Limited | Hospitality | 2002 |
| Liza Designs Limited | Manufacturing | 2000 |
| Llama Arts Limited | Information & communication | 2018 |
| Lloyds Farm Ltd | Arts & recreation | 2025 |
| LMH 15 Limited | Professional & scientific | 2015 |
| Local Home Improvements Ltd | Construction | 2025 |
| Locking Good Ltd | Administrative & support | 2023 |
| Loft House Building Solutions Limited | Construction | 2013 |
| Loft House Investments Ltd | Real estate | 2020 |
| Lois Properties Limited | Real estate | 2025 |
| Londonfashionlogistics Ltd | Transport & logistics | 2018 |
| Longe NA Limited | Manufacturing | 2021 |
| Longe Services Ltd | Administrative & support | 2022 |
| Longtail Properties Limited | Real estate | 2011 |
| Lorie's Caravan & Cleaning Ltd | Hospitality | 2025 |
| Lorin Kebab Ltd | Hospitality | 2020 |
| Loveday Enterprises Limited | Hospitality | 2025 |
| LR Resources Ltd | Construction | 2021 |
| LT Holiday Lets Limited | Real estate | 2017 |
| Lukes Cleaning Service Ltd | Administrative & support | 2025 |
| Luna Inns Ltd | Hospitality | 2023 |
| Luxe Holiday Lets Limited | Real estate | 2022 |
| Lymn Bank Farm Limited | Manufacturing | 2013 |
| Lyndhurst Garden Centre Ltd | Agriculture & fishing | 2012 |
| M & H Cantelmi (Properties) Ltd | Real estate | 2021 |
| M and DS Catering Ltd | Hospitality | 2024 |
| M and M Gifts Ltd | Wholesale & retail | 2025 |
| M.J.M. & Co. Ltd | Manufacturing | 2012 |
| Maahi Stores Ltd | Wholesale & retail | 2021 |
| MAD Harry's Limited | Wholesale & retail | 2014 |
| Magitec Amusements Ltd | Professional & scientific | 2022 |
| Magna Solutions Ltd. | Information & communication | 2025 |
| Magpiesflooring Ltd | Construction | 2026 |
| Maintenaceland Ltd | Construction | 2026 |
| Majeak Design Limited | Wholesale & retail | 2017 |
| Maka Trans Ltd | Transport & logistics | 2015 |
| Mangia Mangia Ltd | Hospitality | 2026 |
| Manjeet Enterprise Ltd | Administrative & support | 2017 |
| Manock and Colinshaw Ltd | Professional & scientific | 2025 |
| Manor Crest Construction Limited | Construction | 2001 |
| Manor Crest Developments 2 Limited | Extraterritorial | 2001 |
| Manor Crest Developments Ltd | Construction | 2019 |
| Manor Crest Homes CW Ltd | Construction | 2018 |
| Manor Crest Homes Limited | Construction | 2006 |
| Manor Drive WHS Management Company Limited | Real estate | 2019 |
| Manor View Estate Management Company Ltd | Real estate | 2024 |
| Manorgate Management Company Limited | Real estate | 2006 |
| MAP Security Solutions Limited | Administrative & support | 2008 |
| Margaret Allan Limited | Construction | 2011 |
| Marina Fish & Chip (Lincs) Limited | Hospitality | 2025 |
| Marine Boathouse Limited | Hospitality | 2010 |
| Marshall's Court Management Limited | Real estate | 2006 |
| Marshalls Building & Groundworks Ltd | Construction | 2023 |
| Marwood Developments Ltd | Construction | 2021 |
| Mason Investments Group Ltd | Administrative & support | 2020 |
| Mason Investments Limited | Wholesale & retail | 2012 |
| Mason Nails & Beauty Ltd | Other services | 2024 |
| Masteel Limited | Real estate | 1982 |
| Matilda Holdings Limited | Financial services | 2022 |
| MAX Watches Ltd | Wholesale & retail | 2025 |
| Mayfair and Greenwich Holdings Limited | Administrative & support | 2025 |
| MB Performance Training Limited | Arts & recreation | 2021 |
| Mcalpine Transport Ltd | Transport & logistics | 2020 |