| Louis Films Ltd | Information & communication | 2018 |
| Louise Riddell Accounting Limited | Professional & scientific | 2014 |
| Love & Graham Ltd | Real estate | 2021 |
| Lovehome Building Services Limited | Construction | 2021 |
| Lovell Innovation Ltd | Information & communication | 2025 |
| Lovepad Ltd | Wholesale & retail | 2025 |
| Lovesgrove Taxis Limited | Transport & logistics | 2016 |
| Lovett-Hume Enterprises Ltd | Information & communication | 2024 |
| LOW Angle Films Limited | Information & communication | 2015 |
| Lrctrading Ltd | Manufacturing | 2015 |
| LRT Trading Ltd | Extraterritorial | 2008 |
| LS Developers Ltd | Professional & scientific | 2025 |
| LSL Solutions Ltd | Administrative & support | 2025 |
| LSM People Consulting Ltd | Professional & scientific | 2026 |
| Lspm Services Ltd | Construction | 2025 |
| LTA Wisdom Education Ltd | Education | 2026 |
| Ltaw Property Limited | Real estate | 2022 |
| Lucanico Ltd | Professional & scientific | 2024 |
| Luce and Earth Ltd | Wholesale & retail | 2025 |
| Lucia Vega Interiors Ltd | Professional & scientific | 2015 |
| Lucky 73 Ltd | Transport & logistics | 2025 |
| Lucky Jersery Farm Limited | Hospitality | 2023 |
| Lucky Omsin’S Thai Limited | Hospitality | 2023 |
| Lucy Chen Limited | Professional & scientific | 2021 |
| Lucy Gibson Limited | Professional & scientific | 2017 |
| Lucy Southwood Ltd | Information & communication | 2026 |
| Luke Digby Web Consulting Ltd | Information & communication | 2021 |
| Lukin Motion L.A Limited | Construction | 2026 |
| Lukumades King Ltd | Wholesale & retail | 2025 |
| Lulu Services Limited | Agriculture & fishing | 2009 |
| Lumen Bloomsbury Limited | Other services | 2024 |
| Lumen Property Group Ltd | Households | 2026 |
| Lumin Advisory Limited | Professional & scientific | 2020 |
| Lumin Asset Management Limited | Financial services | 2020 |
| Lumin Business Services Limited | Administrative & support | 2020 |
| Lumin Consulting Services Limited | Professional & scientific | 2020 |
| Lumin DFM Limited | Financial services | 2020 |
| Lumin Financial Services Limited | Financial services | 2020 |
| Lumin Group Limited | Financial services | 2018 |
| Lumin Portfolio Management Limited | Financial services | 2020 |
| Lumin Wealth Limited | Financial services | 1997 |
| Lumin Wealth Management Limited | Administrative & support | 2010 |
| Luminate Media Limited | Information & communication | 2024 |
| Lumyn Labs Ltd | Information & communication | 2026 |
| Luna and Cash Ltd | Wholesale & retail | 2021 |
| Lunaz Group Ltd | Professional & scientific | 2021 |
| Lunaz Ltd | Wholesale & retail | 2018 |
| Lupus Creative Limited | Information & communication | 2013 |
| Luquez Engineering Ltd | Other services | 2016 |
| Lurra Ltd | Hospitality | 2014 |
| Lush Gardens Design & Maintenance Ltd | Arts & recreation | 2023 |
| Lutetia SPV I LLP | | 2021 |
| Luton and District Motorcycle Club Limited | Arts & recreation | 1985 |
| Luton Mart Limited | Wholesale & retail | 2013 |
| LUX M.C. Limited | Real estate | 2025 |
| Luxe Assistants Ltd | Administrative & support | 2026 |
| Luxella Ltd | Other services | 2021 |
| Luxury Aesthetics Ltd | Other services | 2025 |
| Luxury Lashes by Jessica Ltd | Other services | 2020 |
| LW Productions Limited | Information & communication | 2015 |
| Lwhcp Limited | Health & social care | 2015 |
| LXR2 Consult Ltd | Information & communication | 2023 |
| Lyall Youngman Limited | Professional & scientific | 2001 |
| Lychfield Close Management Limited | Households | 2023 |
| LYE Green Development Limited | Construction | 2016 |
| Lyncarian Ltd | Real estate | 2022 |
| Lyonsheath Limited | Health & social care | 2019 |
| M & F Property Ltd | Real estate | 2017 |
| M & H Residential Estates Ltd | Real estate | 2022 |
| M & J Arnold Limited | Wholesale & retail | 2007 |
| M & J Photography Ltd | Professional & scientific | 2013 |
| M & L Business Solutions Ltd. | Professional & scientific | 2009 |
| M & M GAS Services Limited | Construction | 2008 |
| M and N Languages Limited | Education | 2024 |
| M Anderson Consulting Limited | Information & communication | 2014 |
| M C Enterprises Recovery (UK) Ltd | Transport & logistics | 2006 |
| M Carey Properties Limited | Real estate | 2014 |
| M Chapman Auto Services Limited | Wholesale & retail | 2003 |
| M H Consulting UK Limited | Professional & scientific | 2007 |
| M J Lythgoe Ltd | Professional & scientific | 2011 |
| M Keshishian & Co Art Advisory Ltd | Other services | 2023 |
| M L C Project Management Limited | Information & communication | 2017 |
| M R Car Sales Ltd | Wholesale & retail | 2018 |
| M Studio London Limited | Professional & scientific | 2015 |
| M Tring Ltd | Other services | 2025 |
| M V Scotter Building Services Ltd. | Construction | 2004 |
| M&A Refurbishments Limited | Construction | 2024 |
| M&Ap Investments Ltd | Construction | 2020 |
| M&C Cars Ltd | Wholesale & retail | 2010 |
| M&D Business Development Ltd | Construction | 2026 |
| M&I Property Limited | Real estate | 2023 |
| M&M Wines Ltd | Wholesale & retail | 2024 |
| M&O Water Mains Ltd | Construction | 2022 |
| M&R Insights Ltd | Information & communication | 2015 |
| M&R Partners Limited | Health & social care | 2024 |
| M&T House Limited | Wholesale & retail | 2024 |
| M. Hasnain & Co Limited | Wholesale & retail | 2005 |
| M. Oliver (Building Contractors) Limited | Construction | 1997 |
| M. Rodwell Investments Limited | Real estate | 1964 |
| M.K.A.A. Limited | Real estate | 2016 |