| Killips Furnishers Limited | Wholesale & retail | 1976 |
| Kindee Limited | Hospitality | 2019 |
| King of Kebab Ltd | Hospitality | 2025 |
| King Transport Ltd | Transport & logistics | 2020 |
| KIP Mcgrath (Shipley) LP | | 2024 |
| Kirkgate Community Centre | Other services | 2008 |
| Kirkgate Food Ltd | Hospitality | 2024 |
| Kirklands Court (Baildon) Management Company Limited | Real estate | 1989 |
| KJ Customs Limited | Wholesale & retail | 2023 |
| KJT Wealth Management Limited | Financial services | 2014 |
| Klair B Transpor Ltd | Transport & logistics | 2025 |
| KM Maxfield Ltd | Real estate | 2009 |
| KM Pharma Services Ltd | Professional & scientific | 2023 |
| Know HOW Consulting Ltd | Administrative & support | 2024 |
| Kobol Solutions Limited | Information & communication | 2012 |
| Kofibres Ltd | Wholesale & retail | 2019 |
| Konzept MOT & Tyres Ltd | Wholesale & retail | 2020 |
| Koryntreno Ltd | Information & communication | 2026 |
| KP Personal Training Ltd | Arts & recreation | 2021 |
| KPL BFD Ltd | Wholesale & retail | 2024 |
| KS Consulting Solutions Ltd | Professional & scientific | 2026 |
| KSS Sales and Marketing Limited | Administrative & support | 2016 |
| Kukki's Ltd | Hospitality | 2016 |
| Kul-Rash Ltd | Real estate | 2010 |
| L J Teale Properties Ltd | Real estate | 2026 |
| L. M. Stacey and Sons Limited | Extraterritorial | 2017 |
| L. M. Stacey Limited | Construction | 2017 |
| L2L Trading Limited | Financial services | 2026 |
| LA Cachette Ltd | Transport & logistics | 2023 |
| LA Joinery Fabrications Ltd | Manufacturing | 2013 |
| Ladgo Trans Ltd | Transport & logistics | 2015 |
| Lady Lane Properties Ltd | Real estate | 2019 |
| Lamb & Robinson Ltd | Real estate | 2024 |
| Langley Holiday Lets Ltd | Hospitality | 2024 |
| Langley Properties (North) Ltd | Real estate | 2014 |
| Langley Properties Heating & Insulation Ltd | Construction | 2022 |
| Langley Supported Rentals Ltd | Real estate | 2024 |
| Lara Broadwell Occupational Therapy Limited | Health & social care | 2023 |
| Larden Hall Developments LLP | | 2017 |
| Last Watch Games Ltd | Information & communication | 2026 |
| Law Head Car & Commercial Limited | Wholesale & retail | 2024 |
| Lawless Cyber Ltd | Information & communication | 2025 |
| Laxton Holdings Limited | Financial services | 2015 |
| Laxtons Limited | Manufacturing | 2002 |
| LDA Expansion Limited | Professional & scientific | 2021 |
| LDB Brickwork Ltd | Construction | 2025 |
| LE Monde Shipley Ltd | Hospitality | 2019 |
| LE Monkey Consultancy Limited | Education | 2025 |
| LEA Childcare LP | | 2025 |
| Leadease Limited | Professional & scientific | 2025 |
| Learn & Experience Limited | Arts & recreation | 2009 |
| Leeds Bradford Electricians Ltd | Construction | 2025 |
| Leeds Vent Ltd | Professional & scientific | 2023 |
| Leeds Water Taxi Ltd | Transport & logistics | 2026 |
| Leelas Ladybirds Limited | Health & social care | 2014 |
| Leopard Games Ltd | Information & communication | 2009 |
| Lesley J Consultancy Services Ltd | Information & communication | 2017 |
| Lexis Legal Consulting Ltd | Professional & scientific | 2026 |
| Lick Photo Ltd | Professional & scientific | 2024 |
| Lifesauce Limited | Other services | 2009 |
| Light Technologies Limited | Manufacturing | 2025 |
| Lightbody Motors Limited | Wholesale & retail | 2025 |
| Lighthouse Electric Contractors Limited | Construction | 2018 |
| Lighthouses Painting & Decorating Ltd | Construction | 2021 |
| Lightowler Group Limited | Financial services | 2024 |
| Lightowler Investments Limited | Real estate | 2024 |
| Lilico Group Ltd | Financial services | 2026 |
| Linguatec UK Limited | Information & communication | 2011 |
| Link Distribution (Europe) Limited | Wholesale & retail | 2010 |
| Link Distribution (UK) Limited | Wholesale & retail | 2007 |
| Link Property & Development Limited | Construction | 2021 |
| Lisa Marlow Associate Trainer Ltd | Administrative & support | 2016 |
| Liselac Properties Ltd | Real estate | 2020 |
| Lister's Little Un's Limited | Health & social care | 2023 |
| Lithu Healthcare Ltd | Health & social care | 2026 |
| Little Droveway Stud Limited | Agriculture & fishing | 2006 |
| Littletaffybear Ltd | Wholesale & retail | 2021 |
| Ljem Ltd | Construction | 2014 |
| LJH Property Ltd | Construction | 2019 |
| LJK Developments Ltd. | Construction | 2025 |
| LJM Property Holdings Limited | Real estate | 2025 |
| LKB Doors Limited | Construction | 2024 |
| LKB Enterprises Limited | Hospitality | 2018 |
| Lkit Ltd | Information & communication | 2006 |
| LM North Developments Ltd | Professional & scientific | 2022 |
| Loadlok Roland UK Ltd | Manufacturing | 1978 |
| Lockform Ltd | Information & communication | 2026 |
| Lockham Gate Limited | Real estate | 2020 |
| Lockham Yard Limited | Real estate | 2022 |
| Locum Docs Ltd | Health & social care | 2008 |
| Lodge Farm Calverley Limited | Agriculture & fishing | 2026 |
| Logic Labs Consulting Ltd | Information & communication | 2022 |
| London & Provincial Reproduction Company Ltd. | Professional & scientific | 1990 |
| Long Term Support Ltd. | Real estate | 2020 |
| Longrun Advisory Ltd | Professional & scientific | 2026 |
| Lonk House Investments Limited | Financial services | 2021 |
| Lonk House LLP | | 2011 |
| Looking Ahead Limited | Professional & scientific | 2007 |
| Lottopia CIC | Health & social care | 2025 |
| Louisa BW Ltd | Professional & scientific | 2023 |