| KWM (Yorkshire) Limited | Extraterritorial | 2011 |
| KX Property Ltd | Wholesale & retail | 2022 |
| L & W Insulations Limited | Construction | 1993 |
| L a Walsh Joinery and Development Ltd. | Construction | 2021 |
| L Busfield Management & Joinery Solutions Ltd | Construction | 2022 |
| L C F Management Limited | Professional & scientific | 2013 |
| L Chadwick Contracting Limited | Construction | 2022 |
| L F Trade Ltd | Wholesale & retail | 2023 |
| L H Lifts Limited | Manufacturing | 2013 |
| L M Clark Ltd | Hospitality | 2026 |
| L M Green Accountants Limited | Professional & scientific | 2021 |
| L S Contractors Yorkshire Ltd | Construction | 2026 |
| L S Pharm Ltd | Health & social care | 2015 |
| L&P 12 Limited | Professional & scientific | 1998 |
| L. O'Donnell Holdings Limited | Manufacturing | 2023 |
| L. Shaw Catering Limited | Hospitality | 2022 |
| L.A.B. Developments Ltd | Households | 2025 |
| L.Eightseven Limited | Wholesale & retail | 2019 |
| L.I.D Electrical Limited | Construction | 2022 |
| L.I.D Hyde Limited | Real estate | 2025 |
| L.Newsome Electrical Ltd | Professional & scientific | 2025 |
| L.Nichol Joinery Limited | Construction | 2022 |
| L.O.E Music Ltd | Arts & recreation | 2020 |
| LA Vedetta Limited | Hospitality | 2019 |
| Laamp Ltd | Arts & recreation | 2006 |
| Labtek Dental Laboratory Ltd | Manufacturing | 2024 |
| LAC Property Group Ltd | Real estate | 2024 |
| LAD Construction Ltd | Construction | 2024 |
| Ladyship Manufacturing Limited | Manufacturing | 2017 |
| Laithe Croft Investments | Financial services | 2018 |
| Lala Market Limited | Wholesale & retail | 2025 |
| Lalezar Store Ltd | Wholesale & retail | 2026 |
| Lamb & Lion (UK) Limited | Hospitality | 2015 |
| Lambda Tuition Ltd | Education | 2023 |
| Lambourne Danes Ltd | Wholesale & retail | 2025 |
| Lamppost Banners Ltd | Professional & scientific | 2010 |
| Lamt Limited | Financial services | 2024 |
| Land Recovery North West (Clockface) Limited | Water & waste | 2006 |
| Lane END Marketing Ltd | Professional & scientific | 2025 |
| Langcroft Consultancy Ltd | Professional & scientific | 2022 |
| Langfield Holdings Limited | Wholesale & retail | 2017 |
| Langford Builders and Design Limited | Construction | 2015 |
| Langley Offshore Consultants Limited | Administrative & support | 2007 |
| Lanika Restaurant Ltd | Hospitality | 2015 |
| Lapwing Consultancy Ltd | Professional & scientific | 2014 |
| Larchcrest Limited | Households | 1980 |
| Larkleaze Ltd | Real estate | 2021 |
| Laser Glow Ltd | Other services | 2024 |
| Laser Lounge HQ Limited | Other services | 2019 |
| Laser Mania Ltd | Arts & recreation | 2021 |
| Latera Limited | Real estate | 2021 |
| Laughlan Surgical Ltd | Health & social care | 2019 |
| Launchpad Childcare Ltd | Health & social care | 2026 |
| Laur Popescu Transport Ltd | Transport & logistics | 2016 |
| Laura Brennan Equestrian Centre Ltd | Agriculture & fishing | 2014 |
| Laura Garratt Limited | Real estate | 2024 |
| Laurel Mount Management Company (Halifax) Limited | Households | 1996 |
| Lauren James Office Interiors Limited | Construction | 2004 |
| Lauriston Wades Ltd | Wholesale & retail | 2025 |
| Lavender Palms Ltd | Wholesale & retail | 2025 |
| Law Decking and Garden Buildings Ltd. | Construction | 2021 |
| Lawfinix Legal Limited | Professional & scientific | 2023 |
| Lawn and Order HX Ltd | Administrative & support | 2024 |
| Lawrence (Yorkshire) Limited | Construction | 2024 |
| Lawrence Engineering & Maintenance Services Ltd | Manufacturing | 2014 |
| Lawton & Sygrove Developments Ltd | Construction | 2023 |
| Lawton Electrical Solutions Ltd | Construction | 2021 |
| Laylah Construction Ltd | Construction | 2023 |
| Lazenby Property Limited | Real estate | 2019 |
| Lazer Mania Ltd | Arts & recreation | 2025 |
| LB Estate Agents Ltd | Real estate | 2025 |
| LB Fitness Halifax Ltd | Arts & recreation | 2022 |
| LBL Therapist Services Ltd | Health & social care | 2022 |
| LBP Estates Ltd | Real estate | 2020 |
| LC OMA 2 Limited | Construction | 2021 |
| LCB Developments Ltd | Construction | 2026 |
| LDK Investments Ltd | Financial services | 2016 |
| Ldntennis Ltd | Education | 2017 |
| LDT Luxury Communications Ltd | Professional & scientific | 2022 |
| LE Doner Limited | Hospitality | 2025 |
| LEA Gardens Management Company Limited | Households | 2020 |
| Lead & Rein Limited | Wholesale & retail | 2019 |
| Leading on Creative Ltd | Professional & scientific | 2025 |
| Leadsun Limited | Professional & scientific | 2026 |
| Leaf & Ether CIC | Education | 2026 |
| Leafy LUX Limited | Wholesale & retail | 2024 |
| Leah Nicholson Ltd | Health & social care | 2025 |
| Leams Fabrication & Welding Ltd | Construction | 2017 |
| Lean Efficiency Ltd | Professional & scientific | 2012 |
| Leap Worldwide Limited | Administrative & support | 2002 |
| Learn Early Books Limited | Wholesale & retail | 2012 |
| Learn Through Play Childcare Ltd | Education | 2013 |
| Learn With SAT Ltd | Education | 2023 |
| Learning Services Ltd | Education | 2024 |
| Leatherable Limited | Wholesale & retail | 2025 |
| Lebanese House 24 Ltd | Hospitality | 2024 |
| LEE Handley Builders Limited | Construction | 2015 |
| LEE Handley Landscaping Ltd | Administrative & support | 2023 |
| LEE Mcpartling Ltd | Administrative & support | 2017 |
| LEE Mount Healthcare Limited | Health & social care | 2004 |