| Kleeford Coin Auctions Limited | Wholesale & retail | 2011 |
| Klime-Ezee Limited | Manufacturing | 1993 |
| Klod International Ltd | Transport & logistics | 2015 |
| KMH Consultancy Services Ltd | Professional & scientific | 2022 |
| Knowles Engineering Limited | Professional & scientific | 2022 |
| Korrp Limited | Information & communication | 2024 |
| KPD Surfacing Limited | Construction | 2017 |
| KRD Vape Ltd | Wholesale & retail | 2025 |
| Kumor Services Ltd | Transport & logistics | 2024 |
| L and K Properties 2024 Limited | Construction | 2025 |
| L Byard Sales & Marketing Limited | Professional & scientific | 2025 |
| L S B Holiday Lettings Ltd | Hospitality | 2025 |
| L S B Lettings Ltd | Real estate | 2022 |
| L S Building & Development Ltd | Construction | 2021 |
| L W Smart Repairs Limited | Wholesale & retail | 2008 |
| L. Barker Building Limited | Construction | 2023 |
| Lake and Company (Alfreton) Limited | Other services | 1949 |
| Lalitha &Co Ltd | Other services | 2018 |
| Lanavision Limited | Other services | 2007 |
| Larkhill Commercial Limited | Professional & scientific | 2020 |
| Leabrooks Fishbar Limited | Hospitality | 2002 |
| Leabrooks Gallery Limited | Wholesale & retail | 2004 |
| Leabrooks Motor Services Limited | Wholesale & retail | 2000 |
| Lean-Rebellion Ltd | Administrative & support | 2025 |
| LEE Morgan Limited | Wholesale & retail | 2008 |
| LEE Salmon CM Ltd | Construction | 2022 |
| LEE Smithurst Barbers Ltd | Other services | 2016 |
| LEE Warne Golf Ltd | Administrative & support | 2016 |
| Leengate Group Limited | Financial services | 2014 |
| Leengate Holdings Limited | Financial services | 2013 |
| Leengate Valves Limited | Wholesale & retail | 1985 |
| Legwear International Ltd | Wholesale & retail | 1997 |
| LF Civils Ltd | Construction | 2016 |
| LF Flooring & Sons Ltd | Construction | 2025 |
| LF Investments Holdings Limited | Other services | 2026 |
| LGH Holdings Limited | Professional & scientific | 2005 |
| LH Car Care Ltd | Wholesale & retail | 2024 |
| LH Crop Specialist Ltd | Agriculture & fishing | 2026 |
| LI Enterprise Ltd | Hospitality | 2019 |
| Lien Limited | Education | 2026 |
| Life Boss Ltd | Information & communication | 2020 |
| Life Made Competitions Ltd | Professional & scientific | 2023 |
| Lifestyle Boats and Motor Homes Limited | Manufacturing | 2019 |
| Lifestyle Leisure Ltd | Arts & recreation | 2022 |
| Lift and Engineering Design Services Limited | Administrative & support | 2000 |
| Light Beyond Limited | Extraterritorial | 2010 |
| Liketennis Ltd | Education | 2024 |
| Lime Tree Property Investments Limited | Real estate | 2020 |
| Linden Design & Build Limited | Construction | 2002 |
| Lindhurst Power Protection Limited | Information & communication | 2016 |
| Lionel's DEN Limited | Construction | 2016 |
| Little Miss Plumber Limited | Professional & scientific | 2026 |
| Little PIG Jewellery Design Ltd | Arts & recreation | 2014 |
| LJD Fabrications Limited | Manufacturing | 2014 |
| Local Lets (Midlands) Ltd | Real estate | 2018 |
| Lomah Management Limited | Professional & scientific | 2019 |
| Londons Finest Events Ltd | Administrative & support | 2026 |
| Longcote Living Ltd | Wholesale & retail | 2025 |
| Longsword Projects Limited | Real estate | 2016 |
| Longsword Solutions Limited | Professional & scientific | 2012 |
| Losd Ltd | Other services | 2026 |
| Lotus Lounge 2023 Ltd | Hospitality | 2023 |
| Love Always Hopes Ltd | Manufacturing | 2017 |
| Lovel Group Ltd | Real estate | 2025 |
| Lovevoucher Ltd | Wholesale & retail | 2014 |
| Lowe Priced Limited | Wholesale & retail | 2025 |
| LT Coxhead Building Services Ltd | Construction | 2021 |
| Lucid Vault Ltd | Information & communication | 2025 |
| Lucky Gecko Trading Limited | Wholesale & retail | 2019 |
| Lucky Star Y Ltd | Hospitality | 2023 |
| Luminate Creative Limited | Information & communication | 2025 |
| Luna Laser Studio Ltd | Other services | 2025 |
| LUX Beauty and Tanning Ltd | Other services | 2021 |
| LW on Site Services Limited | Construction | 2007 |
| Lydford Cast Stone Products Limited | Financial services | 2020 |
| Lynas HR Consulting Limited | Professional & scientific | 2022 |
| M P Farm Limited | Information & communication | 2016 |
| M Parkin Plastering Ltd | Construction | 2015 |
| M R Autos Ltd. | Wholesale & retail | 2018 |
| M S P Building Services (Leics) Ltd | Construction | 2021 |
| M&L Innovations Ltd. | Wholesale & retail | 2024 |
| M. Burrows Agricultural Engineering Ltd | Professional & scientific | 2020 |
| M.A.D.E @ NO. 18 Ltd | Hospitality | 2014 |
| MAC Squared Developments Ltd | Construction | 2026 |
| Machin & SON Ltd | Construction | 2021 |
| Maddock Plant Hire Limited | Construction | 2003 |
| Made by Silly Sprout Ltd | Wholesale & retail | 2025 |
| Made by Sport Ltd | Wholesale & retail | 2025 |
| Madison & Quinn Ltd | Hospitality | 2015 |
| MAF Property Limited | Real estate | 2014 |
| Magnolia Consultancy Services Limited | Professional & scientific | 2024 |
| Majestic Mechanical Solutions Ltd | Administrative & support | 2024 |
| Malelane Management Limited | Households | 1992 |
| Maloki Ltd | Health & social care | 2021 |
| Mantell Manufacturing Limited | Manufacturing | 2003 |
| Margolis Estates Ltd | Real estate | 2026 |
| Mark Keenan Car Sales Limited | Wholesale & retail | 2005 |
| Mark Leeson (B) Ltd | Other services | 2025 |
| Markus Holdings Limited | Financial services | 2018 |
| Marriott Distributions Ltd | Manufacturing | 2024 |