| Just Keepers Limited | Wholesale & retail | 1999 |
| Justsparkle-Uk Ltd | Wholesale & retail | 2021 |
| Juxta Homes Limited | Construction | 2022 |
| JW Hinckley Ltd | Hospitality | 2024 |
| JWP Motorsport Ltd | Wholesale & retail | 2024 |
| K Chand Consulting Ltd | Professional & scientific | 2025 |
| K Cutz Hinckley Ltd | Other services | 2025 |
| K Russell Memorials Limited | Manufacturing | 2007 |
| K Ventures Consulting Limited | Information & communication | 2018 |
| K W Property Investments Ltd | Real estate | 2022 |
| K&D Travel Ltd | Transport & logistics | 2017 |
| K. Hartlett & Associates Limited | Manufacturing | 2009 |
| K. Woodings and Sons Limited | Agriculture & fishing | 1989 |
| KA Tooling Ltd | Manufacturing | 2004 |
| KAD Digital Ltd | Manufacturing | 2024 |
| Kajtek Grocery Limited | Wholesale & retail | 2024 |
| Kalam Properties Limited | Real estate | 2001 |
| Kalek Trans Ltd | Transport & logistics | 2015 |
| KALELI12 Ltd | Hospitality | 2023 |
| Kamilat. Ltd | Transport & logistics | 2021 |
| KAN Repairs Ltd | Wholesale & retail | 2025 |
| Kane Fittings Limited | Construction | 2026 |
| Kannan News Limited | Wholesale & retail | 2013 |
| KAP Engineering Services Ltd | Wholesale & retail | 2021 |
| Karadasheva Limited | Other services | 2012 |
| KB Electrical Leics Ltd | Construction | 2022 |
| KBD Commercial 2 Ltd | Administrative & support | 2023 |
| KC Design Consultancy Ltd | Professional & scientific | 2018 |
| KD I.T. Services Limited | Information & communication | 2012 |
| Keegan Curran Limited | Manufacturing | 2026 |
| Keeper ID Limited | Wholesale & retail | 2008 |
| Keerthi Retail Ltd | Wholesale & retail | 2018 |
| Keldrew Installations Ltd | Construction | 2015 |
| Kellys-Webdesigns Ltd | Professional & scientific | 2012 |
| Kemp Engineering Limited | Administrative & support | 2024 |
| Kennedy's (Castle Street) Limited | Other services | 2004 |
| Kerf Ltd | Professional & scientific | 2006 |
| Kestrel Innovations Limited | Professional & scientific | 2007 |
| Ketomi Distribution Ltd | Health & social care | 2014 |
| Kevin Ayres Ltd | Financial services | 2019 |
| Key Provisions Limited | Manufacturing | 2015 |
| Keys Mortgages Ltd | Financial services | 2021 |
| Keysound (Leicester) Limited | Wholesale & retail | 2003 |
| Keystone Rail Operations Group Ltd | Administrative & support | 2025 |
| KFL Shipping Services Limited | Other services | 2006 |
| KGH Properties Limited | Real estate | 2016 |
| KH Funeral Supplies Ltd | Administrative & support | 2016 |
| Khan Catering Hinckley Limited | Hospitality | 2025 |
| Kidspace Ltd | Health & social care | 2023 |
| Kieran Thomas Golf Ltd | Education | 2026 |
| Kiko Houzz Interiors Limited | Manufacturing | 2022 |
| Kilo Holdings Limited | Real estate | 2016 |
| Kingfisher Care (Midlands) Ltd | Health & social care | 2012 |
| Kings Hill Cremations Limited | Administrative & support | 2010 |
| Kinship Enterprises Ltd | Real estate | 2026 |
| Kitchen & Bathroom Creations Limited | Construction | 2011 |
| Kitchen & Bedroom Design Limited | Manufacturing | 2002 |
| Kiwi House Care Home Limited | Health & social care | 2014 |
| Kixo Ltd | Information & communication | 2009 |
| KM Eleven Ltd | Administrative & support | 2024 |
| KMC Property Management Limited | Real estate | 2021 |
| KMJ Maintenance Services Ltd | Manufacturing | 2021 |
| KMR Paint Plant Limited | Other services | 2016 |
| Knights Leather Repair Limited | Other services | 2013 |
| KNP Bar Enterprise Ltd | Hospitality | 2025 |
| Kobe's Doghouse Ltd | Other services | 2025 |
| Kollajoin Ltd | Manufacturing | 2024 |
| Kompass Resourcing Ltd | Administrative & support | 2024 |
| Korgan UK Limited | Wholesale & retail | 2026 |
| Krancis Ltd | Wholesale & retail | 2025 |
| Kreativ Design Ltd | Manufacturing | 2021 |
| Krishna Motors Limited | Wholesale & retail | 2024 |
| KRS Developments Ltd | Manufacturing | 2014 |
| Ksmr Sekhon Ltd | Wholesale & retail | 2014 |
| Kulhas Transport Limited | Transport & logistics | 2018 |
| Kullars Takeaway Ltd | Hospitality | 2024 |
| L & L Leicester Ltd | Other services | 2007 |
| L J Cannon Developments Limited | Construction | 2024 |
| L J Cannon Ltd | Construction | 2023 |
| L Robinson Properties Limited | Real estate | 2024 |
| L Storer Aluminium Fabrications Ltd | Wholesale & retail | 2024 |
| L Storer Aluminium Ltd | Construction | 2019 |
| L&K Property Services Limited | Households | 2026 |
| L&W Sheq Consultants Ltd | Other services | 2018 |
| L-Aims Driving School Ltd | Education | 2025 |
| L. S. E. Solutions Limited | Professional & scientific | 2012 |
| Ladies That DO Networking Limited | Administrative & support | 2024 |
| Lakeland Farm (Barwell) Limited | Other services | 2022 |
| Lamp Enterprises Limited | Wholesale & retail | 2007 |
| Lancroft Transport Services Ltd | Transport & logistics | 2025 |
| Landmark Estates Property Three Ltd | Construction | 2021 |
| Lang WET Waste Limited | Extraterritorial | 2017 |
| Langton Road Residents Management Company Ltd | Households | 2021 |
| Lapping Services (Holdings) Limited | Financial services | 2016 |
| Lapping Services Ltd | Manufacturing | 2011 |
| Larkins Agronomy & Farm Supplies Ltd | Wholesale & retail | 2024 |
| Launch IT Solutions Ltd | Information & communication | 2025 |
| Laura Read Ltd | Arts & recreation | 2016 |
| Laurensboutique Ltd | Wholesale & retail | 2025 |
| Lavender and Parsons Properties Ltd | Real estate | 2025 |