| Karl Vella Group Limited | Administrative & support | 1993 |
| Kathal Property Services Ltd | Construction | 2018 |
| Katie Phythian Design Limited | Information & communication | 2015 |
| Kdpg Limited | Professional & scientific | 2014 |
| KDS Tools Ltd | Wholesale & retail | 2020 |
| Kedar Limited | Real estate | 2020 |
| Kempston SA Ltd | Real estate | 2021 |
| Kenyon & Friends Limited | Hospitality | 2011 |
| KF Consulting Services Ltd | Health & social care | 2024 |
| KG Prolet LLP | | 2008 |
| Khaya Living Ltd | Real estate | 2018 |
| Kinga Nutrition and Lifestyle Ltd | Health & social care | 2017 |
| Kings Facilities Maintenance Limited | Construction | 2020 |
| Kings Properties (NW) Limited | Real estate | 2018 |
| KLR Business Advisors Limited | Administrative & support | 2026 |
| KMG UK Limited | Administrative & support | 2008 |
| Knowsley Engineering Services Ltd | Manufacturing | 2004 |
| Knox Engineering (NW) Ltd | Professional & scientific | 2019 |
| KNS European Services Ltd | Transport & logistics | 2023 |
| Kode Inc Ltd | Professional & scientific | 2023 |
| Kore MCR Ltd | Professional & scientific | 2026 |
| Kosta & SON Ltd | Transport & logistics | 2025 |
| KP Capital Trading Ltd | Financial services | 2025 |
| Kpms Commercial Limited | Wholesale & retail | 2005 |
| KR Roofing (NW) Ltd | Construction | 2026 |
| Kruiz Access Limited | Construction | 2026 |
| Krzysztof Swat Trans Ltd | Transport & logistics | 2015 |
| Ksec Electrical Ltd | Construction | 2020 |
| Ksec.Electrical Compliance Limited | Energy | 2017 |
| KSI Transport Services Ltd | Transport & logistics | 2021 |
| Ktch Property Ltd | Professional & scientific | 2008 |
| Kurt Morris Haulage Limited | Transport & logistics | 2025 |
| KW Truck Holdings Limited | Professional & scientific | 2016 |
| L & J Holdings (Skelmersdale) Ltd | Real estate | 2018 |
| L Bleasdale Training Ltd | Education | 2022 |
| L&G Property Maintenance Limited | Construction | 2024 |
| L&R7 Ltd | Transport & logistics | 2020 |
| L4 Accommodation Ltd | Real estate | 2025 |
| LA Advanced Practice & Aesthetics Ltd | Public administration | 2022 |
| LA Panna Van Ltd | Manufacturing | 2025 |
| LA Vehicle Solutions Limited | Construction | 2026 |
| Laithwaites Plumbing and Heating Ltd | Construction | 2025 |
| Lalezar Vape Shop Ltd | Wholesale & retail | 2025 |
| Lancashire Assessment Centre Limited | Education | 2007 |
| Lancashire Fire Compliance Ltd | Administrative & support | 2026 |
| Lancashire Logistics INT Ltd | Transport & logistics | 2019 |
| Lancashire Oak Frame Buildings Ltd | Manufacturing | 2025 |
| Lancashire Topsoil Ltd | Administrative & support | 2019 |
| Lance &Georgina Limited Partnership | | 2014 |
| Landscape Lancashire Ltd | Administrative & support | 2025 |
| Lanlocked Games Limited | Information & communication | 2025 |
| Lanny's Gutter Clearing Ltd | Administrative & support | 2023 |
| Larkhill 1954 Limited | Extraterritorial | 2014 |
| Lata Potata Ltd | Hospitality | 2026 |
| Later Life Ltd | Financial services | 2022 |
| Lathom Financial Services Limited | Financial services | 2026 |
| Lathom Pool Hire Ltd | Administrative & support | 2018 |
| Lathom Ventures Ltd | Arts & recreation | 2025 |
| Launchpad Media Services Ltd | Professional & scientific | 2025 |
| Laundry Specialists Ltd | Other services | 2019 |
| Lavi Silvia Trans Ltd | Wholesale & retail | 2025 |
| Lavish Home Limited | Wholesale & retail | 2015 |
| Laviss Clothing Ltd | Wholesale & retail | 2026 |
| Law Electrical Ltd | Construction | 2019 |
| Laydans NW Limited | Professional & scientific | 2025 |
| LB Partners Ltd | Professional & scientific | 2015 |
| LC Coffee Ltd | Hospitality | 2024 |
| Lcroza Ltd | Administrative & support | 2025 |
| LDC International Sales & Marketing Ltd | Wholesale & retail | 2020 |
| Leescott Ltd | Construction | 2023 |
| Legal Support Limited | Arts & recreation | 2003 |
| Leominster Accident Repair Centre Ltd | Wholesale & retail | 2004 |
| Leopold Grove Engineering Company Limited | Manufacturing | 1946 |
| Letago Ltd | Administrative & support | 2025 |
| Letskem Ltd | Real estate | 2025 |
| Lewbry Construction Ltd | Construction | 2019 |
| Lewbry Ltd | Hospitality | 2018 |
| Lewis Hamood Limited | Transport & logistics | 2025 |
| Libero Studio Limited | Information & communication | 2020 |
| Life Towards Fulfilment Ltd | Other services | 2020 |
| Lifestyle Express Stores Limited | Wholesale & retail | 2010 |
| Lifting Gear Training UK Limited | Education | 2017 |
| Lifting Gear UK (Asset Management) Limited | Wholesale & retail | 2007 |
| Lifting Gear UK (Holdings) Limited | Professional & scientific | 2013 |
| Lifting Gear UK Group Limited | Financial services | 2016 |
| Lifting Gear UK Limited | Wholesale & retail | 2014 |
| Lifting Projects UK Limited | Wholesale & retail | 2014 |
| Linealex Ltd | Information & communication | 2022 |
| Lion Pubs and Investments Limited | Hospitality | 2022 |
| Little Explorers Nurseries (Blackbrook) Limited | Health & social care | 2025 |
| Little Explorers Nurseries (Garswood) Limited | Health & social care | 2024 |
| Little Explorers Nurseries (Goose Green) Limited | Education | 2021 |
| Little Explorers Nurseries (Rainford) Limited | Education | 2021 |
| Little Explorers Nurseries Ltd | Education | 2018 |
| Little Explorers Training Ltd | Education | 2025 |
| Little Groves Group Ltd | Arts & recreation | 2026 |
| LIV G Ltd | Wholesale & retail | 2025 |
| Liveration Ltd | Administrative & support | 2023 |
| Liverpool Coach Trimmers Ltd | Manufacturing | 2013 |
| Livewire Technical Services Ltd | Construction | 2022 |