| Local E Homes Ltd | Real estate | 2018 |
| Lochenza Ltd | Other services | 2025 |
| Lodematic (Handling Systems) Limited | Manufacturing | 1999 |
| Loft LEG Ltd | Manufacturing | 2012 |
| Logic TPS Limited | Manufacturing | 2003 |
| Logistics Skills Network Limited | Education | 2020 |
| Lolo Center Ltd | Wholesale & retail | 2025 |
| Lomax Couplers Limited | Manufacturing | 2016 |
| Lomeshaye Launderette Ltd | Other services | 2025 |
| Londis Grove Limited | Hospitality | 2021 |
| Londis Ltd | Wholesale & retail | 2019 |
| Londis Stop Shop Ltd | Wholesale & retail | 2017 |
| London City Metal Ltd | Water & waste | 2019 |
| London City Properties Ltd | Construction | 2006 |
| Londonandsohostores Ltd | Wholesale & retail | 2020 |
| Loneliness UK CIC | Health & social care | 2026 |
| Long Causeway Developments Limited | Construction | 2025 |
| Long Causeway Holdings Limited | Financial services | 2025 |
| Longside Properties Limited | Real estate | 2004 |
| Loom Makers Bistro Limited | Hospitality | 2015 |
| Loombreakers Ltd | Professional & scientific | 2026 |
| Lord Browns Furniture Ltd | Wholesale & retail | 2005 |
| Lord Electrical Ltd | Construction | 2024 |
| LOS Angeles Crispy Limited | Hospitality | 2025 |
| Lottery Services Limited | Professional & scientific | 2003 |
| Lottery Solutions Ltd | Administrative & support | 2014 |
| Loughlin Associates Ltd | Households | 2010 |
| Loughrigg Close Management Ltd. | Real estate | 2009 |
| Louisa Beauty Limited | Other services | 2006 |
| Louise Kirby Consulting Ltd | Professional & scientific | 2025 |
| Louvretie UK Ltd | Wholesale & retail | 2008 |
| Loveclough Limited | Construction | 2024 |
| Loving Lifeline Ltd | Health & social care | 2024 |
| LOW Carbon Survey and Design Ltd | Construction | 2023 |
| Lowerhouse Cricket Club C.I.C. | Arts & recreation | 2006 |
| Lowerhouse Landscapes Ltd | Administrative & support | 2023 |
| Lowerhouse Mini Market Ltd | Hospitality | 2021 |
| Lowerhouse PUB N Play Ltd | Hospitality | 2026 |
| Lowerhouse Village Limited | Hospitality | 2009 |
| LP7 Ltd | Professional & scientific | 2019 |
| LPA NW Ltd | Professional & scientific | 2023 |
| LPH Products Ltd | Extraterritorial | 2024 |
| LPK FM Limited | Administrative & support | 2021 |
| Lplk Properties Ltd | Real estate | 2025 |
| LPM (North West) Ltd | Professional & scientific | 2016 |
| LPP Customs Ltd | Manufacturing | 2010 |
| Lrecruit Limited | Administrative & support | 2023 |
| LS Business Consultants Ltd. | Information & communication | 2011 |
| Lsjc Ltd | Construction | 2025 |
| LSL (SM1) Ltd | Professional & scientific | 2015 |
| LSL (SM2) Ltd | Administrative & support | 2015 |
| LSL (SM3) Ltd | Administrative & support | 2015 |
| LSL (SM4) Ltd | Administrative & support | 2015 |
| LSP Rentals Ltd | Administrative & support | 2025 |
| LTN Supplys Solutions Limited | Wholesale & retail | 2025 |
| Lubrication Engineers International Limited | Wholesale & retail | 2012 |
| Lucy Business Limited | Administrative & support | 2014 |
| Lucy Choi London Limited | Wholesale & retail | 2011 |
| Lucy Goodwin Ltd | Other services | 2016 |
| Luke Howarth Limited | Administrative & support | 2025 |
| Lumen Designers Ltd | Professional & scientific | 2015 |
| Lumina Direct Funerals Ltd | Other services | 2025 |
| Lumiscan Medical Ltd | Health & social care | 2025 |
| Lumora Living Ltd | Wholesale & retail | 2025 |
| Luna Bar Ltd | Hospitality | 2026 |
| Luna Technician Services Ltd | Wholesale & retail | 2022 |
| Lupton & Place Limited | Manufacturing | 1981 |
| Lush Sofas Ltd | Wholesale & retail | 2024 |
| Lusten Ltd | Administrative & support | 2011 |
| Luxury Furniture Store Limited | Wholesale & retail | 2025 |
| Luxvian Limited | Wholesale & retail | 2026 |
| Lynx Building Solutions Limited | Construction | 2019 |
| Lynx Electrical Solutions Limited | Construction | 2019 |
| Lynx Energy and Carbon Assessors Limited | Professional & scientific | 2022 |
| Lynx Engineering Consultants Limited | Other services | 2004 |
| Lynx LED Limited | Construction | 2009 |
| Lynx Project Management Solutions Limited | Professional & scientific | 2023 |
| Lynx Sustainable Solutions Limited | Manufacturing | 2013 |
| M & H Event Co-Ordinators Ltd | Extraterritorial | 2010 |
| M & J Properties Lancs Ltd | Real estate | 2023 |
| M & M Motors (Burnley) Ltd | Wholesale & retail | 2018 |
| M & S Traders Limited | Wholesale & retail | 2009 |
| M a Shah Finishing Services Ltd | Construction | 2026 |
| M B Riley Farms Limited | Agriculture & fishing | 2021 |
| M Chapman & Sons (Textiles) Holdings Limited | Wholesale & retail | 2019 |
| M Chapman & Sons (Textiles) Limited | Wholesale & retail | 1988 |
| M D Plumbing & Electrical Ltd | Construction | 2016 |
| M D S Inspection Ltd | Administrative & support | 2017 |
| M H R Optical Limited | Health & social care | 2015 |
| M S Home Comfort Limited | Manufacturing | 2026 |
| M Saul Electrical Limited | Manufacturing | 2016 |
| M Smithson Ltd | Construction | 2019 |
| M Smithson Properties Ltd | Other services | 2020 |
| M Sons Group Ltd | Wholesale & retail | 2024 |
| M Tracey Building Contractors Ltd | Construction | 2003 |
| M Tracey Ltd | Professional & scientific | 2007 |
| M W Developments (York) Ltd | Construction | 2019 |
| M Wilson Engineering Ltd | Professional & scientific | 2026 |
| M Z Optical Ltd | Health & social care | 2022 |
| M&A Pro Property Ltd | Real estate | 2023 |