| KPM Insight Solutions Ltd | Financial services | 2010 |
| Kraft Kitchens Limited | Wholesale & retail | 2022 |
| KSP Tooling Ltd | Manufacturing | 2008 |
| Kunal Minimarket Ltd | Wholesale & retail | 2021 |
| Kurd Kutz Limited | Other services | 2022 |
| L & N Pneumatics Limited | Manufacturing | 2010 |
| L R Engineering Limited | Manufacturing | 2005 |
| L S M Estates Ltd | Construction | 2026 |
| L T (Goole) Limited | Hospitality | 2023 |
| L V Haulage Limited | Transport & logistics | 2007 |
| L.A. Motor Group Ltd. | Wholesale & retail | 2017 |
| L.A.S. Entertainment Ltd | Wholesale & retail | 2024 |
| Lainton Digital Ltd | Information & communication | 2017 |
| Lambtons Fleet Services Ltd | Wholesale & retail | 2021 |
| Lambtons Fleet Solutions Ltd | Wholesale & retail | 2023 |
| Lancashire Foodtek Limited | Manufacturing | 2018 |
| Landstream Ltd | Professional & scientific | 2023 |
| Langallan CMC Regulatory Solutions Limited | Administrative & support | 2010 |
| Langard Refrigeration Ltd | Manufacturing | 2024 |
| Larsen Road Limited | Manufacturing | 2008 |
| LAS Empire Ltd | Wholesale & retail | 2023 |
| Laser Parts & Training UK Ltd | Wholesale & retail | 2026 |
| Laura Weightman Limited | Arts & recreation | 2015 |
| Lazenby Flooring Ltd | Construction | 2024 |
| Ldas Consulting Ltd | Professional & scientific | 2018 |
| LDP Executive Travel Ltd | Transport & logistics | 2026 |
| LE Bloc Co. Ltd | Manufacturing | 2001 |
| Leaf (Goole) Limited | Hospitality | 2026 |
| Leaf Tandoori(Goole) Limited | Hospitality | 2019 |
| Learmonth(Pt) Limited | Other services | 2026 |
| Leatham Lodge Limited | Real estate | 2026 |
| Leemack Group Limited | Financial services | 2025 |
| Leemack Limited | Professional & scientific | 2012 |
| Leigh TEC Systems Limited | Manufacturing | 2004 |
| Lens Consulting Ltd | Professional & scientific | 2016 |
| LEO Properties (Yorkshire) Ltd | Real estate | 2023 |
| Levare Powered Access Ltd | Manufacturing | 2024 |
| Level Best Concrete Flooring Limited | Construction | 2017 |
| Level Best Holdings Limited | Financial services | 2020 |
| Levels Promotions CIC | Hospitality | 2024 |
| Lexcroft Limited | Hospitality | 2010 |
| LGR Crane Services Ltd. | Manufacturing | 2020 |
| Liam Beaumont TM Ltd | Construction | 2024 |
| Liam Watson TM Ltd | Construction | 2023 |
| Lifestyle Appliances Yorkshire Ltd | Administrative & support | 2015 |
| Light Creative Design & Technology Ltd | Wholesale & retail | 2018 |
| Lilly ANN Limited | Wholesale & retail | 2011 |
| Lilypadz Holdings Limited | Financial services | 2025 |
| Limoncello 82 Limited | Hospitality | 2020 |
| Linktec Limited | Information & communication | 2018 |
| Linstock and Scotby Fisheries Limited | Professional & scientific | 1943 |
| Lions Pack Limited | Information & communication | 2025 |
| Lister and Platt Limited | Manufacturing | 2023 |
| Little HEN Supplies Limited | Wholesale & retail | 2022 |
| Little Tapas Ltd | Hospitality | 2020 |
| Living Eggs North West Ltd | Education | 2025 |
| LL Laser Training Limited | Wholesale & retail | 2026 |
| LMA Technology Ltd | Information & communication | 2020 |
| Lmkh Logistics Limited | Transport & logistics | 2019 |
| Loadbank 4 Hire Limited | Professional & scientific | 2021 |
| Locum and Management Services Limited | Administrative & support | 2024 |
| Lollipop (York) Limited | Hospitality | 2023 |
| Longthorp (Kilpin) Limited | Agriculture & fishing | 1955 |
| Lorenzos Italian Limited | Hospitality | 2019 |
| Lost Generation 1914-18 Limited | Information & communication | 2010 |
| Lost Generation Collectables Limited | Wholesale & retail | 2020 |
| Lotus Goole Ltd | Hospitality | 2021 |
| Lpbrooke Wholesale Ltd | Wholesale & retail | 2024 |
| LR Bulkhead Parts Ltd | Manufacturing | 2021 |
| LR Bulkheads Ltd | Manufacturing | 2020 |
| LRF Autos Ltd | Wholesale & retail | 2023 |
| LSF Electrical Ltd | Construction | 2022 |
| LT97 Ltd | Other services | 2024 |
| LTR Traffic Management Ltd | Construction | 2024 |
| Luing Data Solutions Ltd | Information & communication | 2004 |
| Lunns Builders Limited | Construction | 2003 |
| Lupfaw 424 Limited | Extraterritorial | 2015 |
| Luxtech Limited | Wholesale & retail | 2022 |
| LY Video Ltd | Information & communication | 2021 |
| Lyndon Brownley (PBT) Limited | Construction | 2005 |
| Lynwith Ltd | Professional & scientific | 2010 |
| Lyon Media Ltd | Professional & scientific | 2026 |
| M & L Joinery Limited | Construction | 2006 |
| M & M Automation Ltd | Manufacturing | 2025 |
| M & M Set-Off Solutions Limited | Manufacturing | 2006 |
| M & T Excavation and Plant Limited | Construction | 2025 |
| M B Plant Limited | Construction | 2009 |
| M Barker Engineering Ltd | Professional & scientific | 2023 |
| M Brears & Sons Limited | Agriculture & fishing | 2011 |
| M G F Services Limited | Construction | 2008 |
| M GAL Limited | Construction | 2017 |
| M H Poskitt LLP | | 2010 |
| M Kealey Heating Services Ltd | Other services | 2013 |
| M Marquees Limited | Administrative & support | 2013 |
| M N a Cladding (UK) Limited | Construction | 2021 |
| M N a Group (East Yorkshire) Limited | Administrative & support | 2009 |
| M N a Properties (East Yorkshire) Limited | Real estate | 2026 |
| M N a Support Services Limited | Construction | 2024 |
| M R I P Interests Limited | Professional & scientific | 2017 |
| M T Gerard Building Contractor Ltd | Construction | 2012 |