| L & M Offshore Limited | Professional & scientific | 2011 |
| L a Singer Ltd | Other services | 2015 |
| L Gallagher (Civil Engineering) Ltd | Construction | 2018 |
| L M B Commercial Ltd | Professional & scientific | 2008 |
| L Medics Ltd | Health & social care | 2016 |
| L P C Secretarial Limited | Extraterritorial | 2011 |
| L&L Music Ltd. | Information & communication | 2025 |
| L&L Pavings Ltd | Construction | 2023 |
| L&L Ventures Ltd. | Financial services | 2018 |
| L&M Fire Installations Ltd | Public administration | 2019 |
| L&V Contractors Ltd | Construction | 2019 |
| L'Apartement Ltd | Manufacturing | 2012 |
| L'Officine Ltd | Professional & scientific | 2026 |
| L.E.F. Associates Ltd | Information & communication | 2014 |
| L6FRM Ltd | Transport & logistics | 2015 |
| LA & Co.Building Services Ltd | Construction | 2015 |
| LA Byoot Ltd | Construction | 2023 |
| LA Cucina DI Roberto Limited | Hospitality | 2014 |
| LA Cuisine International Ltd | Hospitality | 2023 |
| LA Maglia Ltd | Information & communication | 2012 |
| LA Montaña Productions Ltd | Information & communication | 2021 |
| LA Petite Grange Ltd | Real estate | 2025 |
| LA Piata Ltd | Wholesale & retail | 2026 |
| LA VIA Pizzeria Ltd | Hospitality | 2024 |
| Laartime Ltd | Construction | 2013 |
| LAB Consultancy Limited | Professional & scientific | 2026 |
| LAB Success Limited | Other services | 2023 |
| Labour Together Limited | Other services | 2015 |
| Labour Together Projects Limited | Professional & scientific | 2023 |
| Lacon Projects Limited | Construction | 2017 |
| Lacos Transport Ltd | Transport & logistics | 2018 |
| Ladieslabels Limited | Wholesale & retail | 2014 |
| Ladywood Property (Investments) Ltd | Other services | 2020 |
| Lago Project Limited | Other services | 2022 |
| Laighs Limited | Wholesale & retail | 2020 |
| Laim LLP | | 2025 |
| Lakearch Limited | Professional & scientific | 2025 |
| Lakemere Green Limited | Other services | 1992 |
| Lakes Apartment Ltd | Real estate | 2025 |
| Lakeside Developments Limited | Construction | 1979 |
| Lakha Investments Ltd | Construction | 2018 |
| Lambda Digital Solutions Ltd | Information & communication | 2019 |
| Lambert Jackson Limited | Arts & recreation | 2018 |
| Lancelot Road (Wembley) Management Company Limited | Real estate | 2006 |
| Lancon Capital Ltd | Real estate | 2017 |
| Land & Sea Inspection Services Limited | Professional & scientific | 2012 |
| Landale Properties Limited | Real estate | 1959 |
| Landlord Property Services (Plymouth) Limited | Construction | 2017 |
| Landmack Limited | Real estate | 2011 |
| Landmarque Ltd | Real estate | 2018 |
| Landsmill Ltd | Real estate | 2020 |
| Lanes Court Management Company Ltd | Households | 2008 |
| Langdale Electrical Services Ltd | Construction | 2017 |
| Langley Consultants Limited | Professional & scientific | 2026 |
| Langley House Maintenance Limited | Administrative & support | 2019 |
| Languard Building Limited | Construction | 2015 |
| Langwell Interiors Ltd | Wholesale & retail | 2026 |
| Lans Properties Limited | Real estate | 2007 |
| Large Blue Limited | Agriculture & fishing | 2025 |
| Lark Enterprises Limited | Other services | 2013 |
| Larken Close Residents Association Limited | Households | 1990 |
| Lasaderm Treatments Limited | Health & social care | 2021 |
| Last Lettings Limited | Real estate | 2021 |
| Late Payment Compensation Limited | Administrative & support | 2016 |
| Latidoh Ltd | Arts & recreation | 2022 |
| Laufer Chauffeur's Ltd | Transport & logistics | 2022 |
| Launcelot W Films | Information & communication | 2022 |
| Launchacre Limited | Households | 1985 |
| Laundrama Ltd | Other services | 2014 |
| Laurann Security Services Ltd | Administrative & support | 2020 |
| Laurent Clerc Ltd | Information & communication | 2009 |
| Laurier Investments Limited | Extraterritorial | 1994 |
| Lavender Administration (UK) Limited | Real estate | 2008 |
| Lavery Leisure Limited | Hospitality | 2003 |
| Lavidan Ltd | Financial services | 2022 |
| Lavin DRY Cleaners Limited | Other services | 2025 |
| Lavish Home Interiors Ltd | Wholesale & retail | 2021 |
| Lawdacity Limited | Professional & scientific | 2010 |
| Lawrence Judaica Ltd | Wholesale & retail | 2017 |
| Laxmi Entertainment Limited | Extraterritorial | 2012 |
| Laysan Holdings Ltd | Financial services | 2024 |
| LAZ Maintenance Ltd | Construction | 2025 |
| LAZ Property Care Ltd | Construction | 2025 |
| LB Creative Events Ltd | Arts & recreation | 2024 |
| LBA Surveyors Ltd | Construction | 2017 |
| LBC London Building Company Ltd. | Construction | 2016 |
| LBP Investments Group Ltd | Real estate | 2024 |
| LC Transport Services Ltd | Transport & logistics | 2026 |
| Lccb Ltd | Health & social care | 2023 |
| LCH Gelati Limited | Wholesale & retail | 2025 |
| LCN Cafe Zoot Ltd | Hospitality | 2021 |
| LCN Tequilas Restaurant Ltd | Hospitality | 2021 |
| LCT 2020 Limited | Hospitality | 2022 |
| LCT House Ltd | Construction | 2020 |
| LD Tiling Contractors Limited | Construction | 2019 |
| Ldim Investments Limited | Professional & scientific | 2013 |
| LDX Properties Ltd | Real estate | 2025 |
| LE Beautybox Limited | Wholesale & retail | 2020 |
| LE Cheffy Ltd | Transport & logistics | 2024 |
| LE Electrical & Building Ltd | Construction | 2024 |