| Kensington Electronics Limited | Professional & scientific | 2015 |
| Keppel Nelson Limited | Professional & scientific | 2024 |
| Keystep Limited | Information & communication | 2005 |
| Keystep Solutions Limited | Information & communication | 2011 |
| KG Electrical & Cable Recycling Ltd | Water & waste | 2026 |
| Kgeh Ltd | Hospitality | 2021 |
| KH Civils Ltd | Construction | 2015 |
| KHI Distribution Ltd | Wholesale & retail | 2025 |
| KIB Property 01 Limited | Real estate | 2024 |
| Kimberley Signs Limited | Manufacturing | 2014 |
| Kimola Trading Co Ltd | Real estate | 1979 |
| King Concrete & Aggregates Ltd | Construction | 2025 |
| King Fencing & Landscaping Ltd | Administrative & support | 2021 |
| King of Tunes Ltd | Arts & recreation | 2018 |
| King Recycling Ltd | Water & waste | 2022 |
| Kingdom Legacy Trust | Financial services | 1954 |
| Kingfisher Window Cleaning Limited | Administrative & support | 2014 |
| Kingsway Developments Ltd | Construction | 2011 |
| Kins Barber Ilkeston Ltd | Other services | 2025 |
| Kirk Hallam Plumbing & Heating Ltd | Construction | 2020 |
| Kirklees Capital Limited | Construction | 2024 |
| KJ Accountancy Ltd | Professional & scientific | 2026 |
| KJ Property 01 Limited | Real estate | 2024 |
| Kjcl Facilities Limited | Real estate | 2024 |
| Klick Hype Int'L Ltd. | Extraterritorial | 2024 |
| KLM Pubco Ltd | Hospitality | 2019 |
| KML Joinery Services Ltd | Construction | 2013 |
| Kniftons' Mobile Toilets Limited | Administrative & support | 2013 |
| Knight & Co Bars Ltd | Hospitality | 2024 |
| Knight & Co Quiz Ltd | Hospitality | 2026 |
| Knightshaw Homes Ltd | Construction | 2023 |
| Kniveton Park 1971 Limited | Extraterritorial | 2014 |
| KNN Building Services Ltd | Construction | 2022 |
| Kochisar Ltd | Hospitality | 2026 |
| Kugel Aerospace & Defence Limited | Manufacturing | 2015 |
| Kugel Motion Limited | Manufacturing | 2009 |
| Kustom Rimz Ltd | Wholesale & retail | 2015 |
| Kvar Developments Ltd | Real estate | 2020 |
| Kvrs Food Ltd | Hospitality | 2019 |
| L & L Future Properties Ltd | Real estate | 2024 |
| L R Composites Limited | Professional & scientific | 2024 |
| L&L Styles Ltd | Other services | 2023 |
| L. Footitt Painting Contractors Ltd | Construction | 2013 |
| L.G.E Construction Ltd | Construction | 2025 |
| LA Decor Ltd | Construction | 2019 |
| LA Trai Hospitality Management Ltd | Hospitality | 2025 |
| Labone Holdings Ltd | Manufacturing | 2018 |
| Labostock Ltd | Administrative & support | 2023 |
| Lacey & Owen Architectural Services Limited | Professional & scientific | 2010 |
| Lally & Warden Ltd | Financial services | 2024 |
| Lamken B Limited | Health & social care | 2024 |
| Landmap Surveys Ltd | Professional & scientific | 2023 |
| Landmere Properties Limited | Real estate | 2022 |
| Larklands Emporium Ltd | Wholesale & retail | 2024 |
| Larry (Homes) Limited | Real estate | 2012 |
| Larry's Number One Bar Ltd | Hospitality | 2014 |
| Latoma Ltd | Health & social care | 2020 |
| Laura G Therapy Ltd | Health & social care | 2022 |
| Lauren Bone Hair Ltd | Other services | 2026 |
| Layerd.Studio Ltd | Manufacturing | 2025 |
| Layla Bratz Ltd | Professional & scientific | 2023 |
| LAZ Body Shop Ltd | Wholesale & retail | 2024 |
| LCM Leisure Limited | Wholesale & retail | 2023 |
| Leadforce Consulting Limited | Professional & scientific | 2026 |
| Leading Edge Systems Limited | Information & communication | 1997 |
| Leadmill Pub.Co. Limited | Hospitality | 2003 |
| Lebeter Homes & Developments Ltd | Real estate | 2025 |
| Ledger Personal Training Ltd | Education | 2025 |
| Lee's Courier Services Ltd | Transport & logistics | 2008 |
| Leen Valley Plants Ltd | Wholesale & retail | 2025 |
| Leigh-Marie Hair & Beauty Ltd | Other services | 2019 |
| Leisure Tech Mobile Ltd | Manufacturing | 2024 |
| Leisure Time (Derby) Limited | Arts & recreation | 2000 |
| Leisureline Amusement Services Limited | Transport & logistics | 2002 |
| Lekisha Doreen Dames Limited | Wholesale & retail | 2025 |
| Leon Delgaudio Ltd | Wholesale & retail | 2025 |
| Leon Haslam Properties Limited | Real estate | 2018 |
| Lesley Tooley Limited | Professional & scientific | 2013 |
| LET IT Be-Gin Ltd | Wholesale & retail | 2021 |
| Let's Fascia IT Limited | Construction | 2003 |
| Letterbox Love Ltd | Wholesale & retail | 2020 |
| Let’S Clean Gutters Limited | Administrative & support | 2025 |
| LEX Roofing Ltd | Construction | 2011 |
| LFG Transform Ltd | Other services | 2026 |
| LI Beautique Limited | Other services | 2026 |
| Liana Homes Limited | Real estate | 2026 |
| Liberate IT Services Ltd | Information & communication | 2016 |
| Liberty Acquisitions Limited | Construction | 2017 |
| Liberty Equipment Ltd | Other services | 2007 |
| Libra Home Improvements Ltd | Construction | 2021 |
| Lift OPS Integrated Services Ltd | Construction | 2026 |
| Lilac Services Ltd | Health & social care | 2019 |
| Limetree Build Ltd | Construction | 2023 |
| Links Motorcycles Ltd | Wholesale & retail | 2025 |
| Linkwood School Farm Limited | Agriculture & fishing | 2020 |
| Liquidchip Limited | Information & communication | 2021 |
| Litho Supplies (UK) Limited | Wholesale & retail | 2009 |
| Little Acorn Advisory Limited | Professional & scientific | 2011 |
| Little Angels Prams Ltd | Wholesale & retail | 2015 |
| Little Pines Day Nursery (Ilkeston) Limited | Health & social care | 2021 |