| Kirk Leedham Ltd | Agriculture & fishing | 2019 |
| Kirk Leedham Property Ltd | Real estate | 2020 |
| Kirkland Contracting & Shotblasting Ltd | Agriculture & fishing | 2014 |
| Kirkland Recovery Ltd | Transport & logistics | 2025 |
| Kirkstall (East Midlands) Limited | Financial services | 2019 |
| Kitchiner Properties Ltd | Real estate | 2017 |
| Kite Construction Ltd | Construction | 2005 |
| Kktm Solutions Ltd | Professional & scientific | 2016 |
| KL Imperium Limited | Financial services | 2019 |
| Kmna Limited | Real estate | 2022 |
| Knight Developments (Leics) Limited | Real estate | 2018 |
| Knight-Fallows Projects Ltd | Professional & scientific | 2018 |
| Knowledgefile Ltd | Professional & scientific | 2004 |
| Kodi Groundworks Ltd | Construction | 2023 |
| Kore Collective Ltd | Arts & recreation | 2026 |
| KS Composites Group Limited | Financial services | 2015 |
| KS Composites Motorsport Limited | Manufacturing | 2015 |
| KS Composites Special Projects Limited | Manufacturing | 2015 |
| KSC One Limited | Manufacturing | 2025 |
| Ktek Solutions Limited | Manufacturing | 2004 |
| Kurdish Barber Melton Ltd | Other services | 2023 |
| Kuzmicz Henderson Storage Ltd | Professional & scientific | 2020 |
| KW MEC Ltd | Construction | 2016 |
| Kyle Hendy Logistics Ltd | Transport & logistics | 2025 |
| Kynos Solutions Ltd | Wholesale & retail | 2024 |
| KYS Security Limited | Administrative & support | 2017 |
| L & H Exhausts Limited | Wholesale & retail | 2012 |
| L a Private Client Ltd | Professional & scientific | 2016 |
| L JM Racing Services Ltd | Arts & recreation | 2026 |
| L N Equine Ltd | Transport & logistics | 2022 |
| L Witcomb Agriculture Limited | Agriculture & fishing | 2024 |
| LA Haze Limited | Education | 1996 |
| LA Legal Services Ltd | Professional & scientific | 2016 |
| LA Perla Restaurant (MM) Ltd | Extraterritorial | 2022 |
| LA Vita MIA Limited | Hospitality | 2019 |
| Laality Ltd | Wholesale & retail | 2017 |
| Laceandlove Ltd | Wholesale & retail | 2025 |
| Lakeview Sport & Leisure Limited | Arts & recreation | 2023 |
| Lakey Properties Limited | Real estate | 2018 |
| Lambourn Oak Ltd | Financial services | 2024 |
| Land Network (Melton) Limited | Water & waste | 2007 |
| Landa & Associates Ltd | Real estate | 2022 |
| Lanecliffe Limited | Construction | 2010 |
| Larchwood Garden and Property Services Ltd | Administrative & support | 2024 |
| Laser Testing Instruments (Cornwall) Ltd | Wholesale & retail | 2024 |
| Laura Hayward Architects Limited | Professional & scientific | 2025 |
| Lavender Mill Care Service Limited | Health & social care | 2019 |
| Law Enforcement Training Solutions Ltd | Education | 2024 |
| Lawnscience (Stamford) Ltd | Administrative & support | 2025 |
| Lawrance Properties Ltd | Real estate | 2024 |
| LC Computers Limited | Wholesale & retail | 2017 |
| LD Leicester Ltd | Arts & recreation | 2026 |
| LD Melton Mowbray Ltd | Arts & recreation | 2026 |
| LD Sheffield Ltd | Arts & recreation | 2026 |
| LE Blanc Fine Art Limited | Wholesale & retail | 2016 |
| LE Health & Safety Ltd | Financial services | 2024 |
| Leaf Stone Restaurant Ltd | Hospitality | 2024 |
| Leal Estates Ltd | Real estate | 2024 |
| Leamington Consulting Services Ltd | Professional & scientific | 2021 |
| Lean Leaders Ltd | Professional & scientific | 2026 |
| Learning Advantage UK Limited | Wholesale & retail | 2022 |
| Learning Together Online Ltd | Information & communication | 2026 |
| LEE and Cooke (Roofing) Limited | Construction | 1978 |
| Leicester Fencing Ltd | Construction | 2024 |
| Leicester Panthers American Football Club CIC | Arts & recreation | 2024 |
| Leicestershire & Rutland Chock Shop Ltd | Hospitality | 2019 |
| Leicestershire & Rutland Land Rover Club Limited | Arts & recreation | 2001 |
| Leicestershire and Rutland Farriery Ltd | Agriculture & fishing | 2023 |
| Leicestershire Concrete Pumping Ltd | Construction | 2015 |
| Leicestershire Construction Training Group Limited | Education | 2018 |
| Leicestershire Training Team Ltd | Professional & scientific | 2019 |
| Leivers Consultancy Ltd | Professional & scientific | 2017 |
| Lena Design Consultancy Ltd | Professional & scientific | 2023 |
| Lenio Accounting Limited | Professional & scientific | 2016 |
| Leon Stewart Limited | Hospitality | 2025 |
| Less PER Group Limited | Information & communication | 2025 |
| Letdat Ltd | Real estate | 2024 |
| Lethwei Limited | Arts & recreation | 2025 |
| Lettah Nmbatha Ltd | Health & social care | 2023 |
| Lettings by HH Ltd | Real estate | 2022 |
| Lewis Baines Ltd | Construction | 2025 |
| Lexibrooke Ltd | Transport & logistics | 2015 |
| LGS Capital Limited | Financial services | 2014 |
| Liftgenie Ltd | Professional & scientific | 2023 |
| Lila Wellbeing CIC | Education | 2023 |
| Lily & Honey Bakery Limited | Wholesale & retail | 2024 |
| Lily's Bespoke Bouquets Limited | Wholesale & retail | 2017 |
| Linark Ltd | Information & communication | 2021 |
| Lincoln Grand Prix Ltd | Arts & recreation | 2023 |
| Linda Needham PMC Limited | Professional & scientific | 2015 |
| Lindfam Properties Limited | Real estate | 2013 |
| Linton Caravans Ltd | Hospitality | 2020 |
| Linton Farms Ltd | Agriculture & fishing | 2015 |
| Lion's Mind Mycology Ltd | Agriculture & fishing | 2026 |
| Liquid 25 Group Limited | Professional & scientific | 2025 |
| Liquid Agency Limited | Professional & scientific | 2000 |
| Little Bird (People Development) Limited | Professional & scientific | 2010 |
| Little Bird (Products) Limited | Wholesale & retail | 2015 |
| Little Hearts Ltd | Health & social care | 2025 |
| Little Nurseries Ltd | Education | 2013 |