| Katherine's Pharmacy Locum Services Limited | Health & social care | 2015 |
| KB Digital Services Ltd | Information & communication | 2025 |
| KDG Property Services Ltd | Real estate | 2025 |
| Kean Williams Consultancy Ltd | Wholesale & retail | 2023 |
| Keep Calm and Carry on Films Ltd | Information & communication | 2024 |
| Keepcalmandcarryonproductions Ltd | Arts & recreation | 2014 |
| Keltana Limited | Information & communication | 2021 |
| Kemsley & Company Solicitors LLP | | 2022 |
| Kemsley House Ltd | Real estate | 2025 |
| Kendrick Interiors Ltd | Professional & scientific | 2022 |
| Kensington Prime Property Limited | Real estate | 2025 |
| Kenzola Design Ltd | Professional & scientific | 2026 |
| KEW Solutions IT Ltd | Information & communication | 2014 |
| Keya Enterprise Limited | Wholesale & retail | 2020 |
| Keya Group Limited | Wholesale & retail | 2021 |
| Keya Investment Limited | Wholesale & retail | 2023 |
| Keya Property Limited | Real estate | 2019 |
| Keya Retail Limited | Wholesale & retail | 2023 |
| Keyplan Developments Limited | Construction | 1960 |
| Keystone Medtech Ltd | Professional & scientific | 2026 |
| Keywharf Ltd | Real estate | 2022 |
| KH Motorcycles Ltd | Wholesale & retail | 2017 |
| KH Property Holdings Ltd | Real estate | 2021 |
| Kibworth Cricket Club Trading Ltd | Hospitality | 2025 |
| Kibworth Garden Design and Landscapes Limited | Administrative & support | 2003 |
| Kibworth Mortgages Ltd | Financial services | 2017 |
| Kilgour Landscapes Limited | Administrative & support | 2010 |
| Kiln Yard Services (UK) Ltd | Information & communication | 2019 |
| Kimberley Distribution Limited | Transport & logistics | 1992 |
| King Performance Ideology Limited | Manufacturing | 2020 |
| Kingsfords Residents Limited | Real estate | 2017 |
| Kislev Global Ltd | Professional & scientific | 2026 |
| Kismet Market Harborough Limited | Hospitality | 2026 |
| KK Sourcing Ltd | Wholesale & retail | 2020 |
| Kliene Properties Limited | Real estate | 1984 |
| Klingair Limited | Manufacturing | 1977 |
| Knauer Ltd | Manufacturing | 2025 |
| Knipe Healthcare Limited | Health & social care | 2016 |
| Knockdown Promotions Ltd | Arts & recreation | 2015 |
| Know Better DO Better Ltd | Professional & scientific | 2024 |
| Koenig Web Design Limited | Information & communication | 2008 |
| Kogent Ltd | Administrative & support | 2023 |
| Koseli Handmade Limited | Wholesale & retail | 2024 |
| KPM Health ED Limited | Health & social care | 2020 |
| KRK Associates Limited | Professional & scientific | 1997 |
| Krystal Caring Limited | Health & social care | 2026 |
| Krystal Clean 1 Ltd | Administrative & support | 2026 |
| Krystle's Starfish Limited | Education | 2018 |
| KSB Property Services Ltd | Real estate | 2025 |
| KSW Locum ANP Limited | Health & social care | 2024 |
| Kudos Manufacturing Solutions Limited | Information & communication | 1999 |
| Kyle Bailey Ltd | Professional & scientific | 2023 |
| Kymm Ltd | Health & social care | 2024 |
| Kyndara Ltd | Professional & scientific | 2026 |
| L Haus Limited | Construction | 2025 |
| L M Carpentry & Installations Limited | Construction | 2017 |
| L S P Builders Limited | Construction | 2018 |
| L&J Properties & Investments Limited | Real estate | 2025 |
| L.T.Stand Solutions Limited | Construction | 2026 |
| Laguna Leisure Limited | Wholesale & retail | 2016 |
| Lake Studios Ltd | Extraterritorial | 2025 |
| Lambo Fitness Ltd | Arts & recreation | 2025 |
| Lamont Worricker Ltd | Professional & scientific | 2015 |
| Landmark Electrical Supplies Limited | Wholesale & retail | 2002 |
| Langdale Management (Thorpe Langton) Limited | Households | 2017 |
| Langham Land (Leics) Limited | Construction | 2023 |
| Langton Brewery Ltd | Manufacturing | 2012 |
| Langton Developments Limited | Construction | 2009 |
| Langton Escapes Limited | Construction | 2014 |
| Langton Escapes Two Limited | Construction | 2022 |
| Langton Homes Limited | Construction | 1994 |
| Languistique Limited | Education | 2012 |
| Lanka Kade (UK) Limited | Manufacturing | 2000 |
| Laura Lane Group Ltd | Wholesale & retail | 2022 |
| Laura Lane Products Ltd | Professional & scientific | 2023 |
| Lauren Selwood Limited | Professional & scientific | 2026 |
| Lauren Young CBT Ltd | Health & social care | 2019 |
| Lawday Limited | Extraterritorial | 1998 |
| Lawlerdavis Holdco Limited | Financial services | 2021 |
| Lawlerdavis Independent Financial Planners Limited | Professional & scientific | 2011 |
| LD Aviation Ltd | Manufacturing | 2024 |
| LD Property Rentals Ltd | Real estate | 2023 |
| Leads.Io Brand Direct Limited | Information & communication | 2017 |
| Leads.Io Ltd | Information & communication | 2009 |
| Leaf Architecture & Design Limited | Professional & scientific | 2012 |
| Learning Effectively Ltd | Education | 2012 |
| Leicester Bolt and NUT Ltd | Wholesale & retail | 2025 |
| Leicester City, County & Rutland "at Risk" WAR Memorials Project | Other services | 2012 |
| Leicester Falcons AFC Limited | Arts & recreation | 2017 |
| Leicester Leisure Builds Ltd | Manufacturing | 2025 |
| Leicester Musical Memory Box C.I.C. | Health & social care | 2018 |
| Leicester Roofline and Cladding Ltd | Construction | 2026 |
| Leicester Squared Consultancy Ltd | Professional & scientific | 2012 |
| Leicester Taiko Ltd | Arts & recreation | 2021 |
| Leicester Vehicle Sales (LVS) Ltd | Wholesale & retail | 2025 |
| Leicester Windows Ltd | Construction | 2021 |
| Leicestershire Agricultural Society Limited | Education | 2003 |
| Leisure Mania Limited | Wholesale & retail | 2018 |
| Lemon Jelly Franchise Ltd | Arts & recreation | 2021 |
| LEN Senior Cars Limited | Wholesale & retail | 1982 |