| Kyzane Consultancy Ltd | Information & communication | 2023 |
| KZ Electrical Contractors Ltd | Construction | 2026 |
| KZ International Ltd | Wholesale & retail | 2025 |
| L & D Higgins Limited | Extraterritorial | 2015 |
| L & H Valentine Limited | Financial services | 2019 |
| L & K Property Management Ltd | Real estate | 2018 |
| L & L Auto Services Limited | Wholesale & retail | 2013 |
| L & L Global Ltd | Professional & scientific | 2016 |
| L & M Fasteners Limited | Wholesale & retail | 2017 |
| L & R Developments Co. Ltd | Construction | 2020 |
| L D Hygiene Therapy Services Limited | Administrative & support | 2016 |
| L J Barrington Building Contractors Limited | Administrative & support | 2002 |
| L R Brothers Ltd | Construction | 2018 |
| L T S Group Holdings Limited | Financial services | 2023 |
| L T S Metal Recycling Limited | Water & waste | 2023 |
| L T S Recycling Services Limited | Water & waste | 2023 |
| L T S Site Services Incorporated Limited | Water & waste | 2014 |
| L T S Skip Hire Limited | Water & waste | 2023 |
| L V Rigging Limited | Information & communication | 2017 |
| L Williams Creative Limited | Arts & recreation | 2022 |
| L&A Cleaning Fusion Ltd | Other services | 2025 |
| L&Aroofing Ltd | Construction | 2023 |
| L&D Building Solutions Ltd | Construction | 2022 |
| L&G Bureau Limited | Professional & scientific | 2006 |
| L&L Haulage Ltd | Transport & logistics | 2023 |
| L&O Pinnacle Football Club Ltd | Arts & recreation | 2025 |
| L&P Hurlock Developments Limited | Construction | 2021 |
| L&P Ltd | Health & social care | 2023 |
| L&P Silver Ltd | Wholesale & retail | 2019 |
| L&S Capital Limited | Professional & scientific | 2017 |
| L&U Ltd | Wholesale & retail | 2018 |
| L.H. Plumbing & Heating Services Limited | Other services | 1989 |
| L.H.N. Construction Limited | Construction | 2008 |
| L.K Protech Ltd | Construction | 2019 |
| L.R Sushi Limited | Wholesale & retail | 2025 |
| L.S. DRY Cleaning Ltd | Manufacturing | 2018 |
| L2 ALL FIX Ltd | Construction | 2017 |
| L8 Limited | Real estate | 2025 |
| LA Casa in London Limited | Manufacturing | 2023 |
| LA Chai Limited | Hospitality | 2017 |
| LA Construct Limited | Construction | 2023 |
| LA Delizia UK Limited | Wholesale & retail | 2017 |
| LA DI DA Sweet Treats Ltd | Hospitality | 2015 |
| LA Kandyan Ltd | Hospitality | 2018 |
| LA Master Ltd | Construction | 2019 |
| LA Prime Properties Limited | Real estate | 2025 |
| LA Property Services Limited | Households | 2025 |
| LA Robert SI Andrei Ltd | Hospitality | 2026 |
| LA Royale London Limited | Other services | 2014 |
| LA Royale UK Limited | Other services | 2024 |
| LA Rustichella Truffles UK Ltd | Wholesale & retail | 2021 |
| LA SEN Network Ltd | Professional & scientific | 2020 |
| LA Vida Padel Ltd | Arts & recreation | 2025 |
| LA Zeza Limited | Hospitality | 2009 |
| Laandgraaf Management LLP | | 2023 |
| Laansya Ltd | Real estate | 2022 |
| Laar Prime Engineering Ltd | Construction | 2016 |
| LAB Creative Legal Limited | Professional & scientific | 2021 |
| LAB Grown Games Ltd | Information & communication | 2025 |
| Labana & Sons Ltd | Hospitality | 2021 |
| Labana Care Limited | Health & social care | 2020 |
| Labana Properties Ltd | Real estate | 2024 |
| Labh Properties Limited | Real estate | 2025 |
| Labh UK Ltd | Information & communication | 2007 |
| Labham Limited | Transport & logistics | 2026 |
| Labour Foreign Policy Group Limited | Other services | 2022 |
| Labour Friends of Palestine and the Middle East | Administrative & support | 2023 |
| Labour Muslim Network Limited | Other services | 2017 |
| Labour Package Ltd | Construction | 2020 |
| Laburnum and Acacia Court Management Limited | Households | 1978 |
| Laburnum Court Residents Association (Stanmore) Limited | Households | 1990 |
| Lacash Properties Unlimited | Real estate | 2008 |
| Lachhani Properties Limited | Real estate | 2017 |
| Lact Costruction Limited | Construction | 2024 |
| LAD Property Investment Ltd | Real estate | 2022 |
| Ladas & Parry London Limited | Professional & scientific | 1969 |
| Ladbrook Home Improvements Limited | Construction | 2011 |
| Ladbrook Homes Limited | Administrative & support | 2015 |
| Ladcrown Properties Limited | Real estate | 1986 |
| Ladd Properties Limited | Real estate | 2014 |
| Ladha & Co Limited | Professional & scientific | 2019 |
| Ladhani Foundation | Education | 2025 |
| Ladiesangel Consult Limited | Health & social care | 2010 |
| Lady Buddha Ltd | Hospitality | 2019 |
| Ladymead Care Home Limited | Health & social care | 2005 |
| Lafa Investments Limited | Wholesale & retail | 2022 |
| Lafan Limited | Real estate | 2021 |
| Lafayette (Film) Limited | Information & communication | 1983 |
| Laga Property Development Limited | Real estate | 2023 |
| Laheri Lala Ltd | Hospitality | 2025 |
| Lahib Ltd | Wholesale & retail | 2017 |
| Lahore E Spice Ltd | Wholesale & retail | 2025 |
| Lahori Masala Express Limited | Hospitality | 2024 |
| Lahori Tikka & Takeaway Ltd | Professional & scientific | 2025 |
| Laidback Apparel Limited | Wholesale & retail | 2001 |
| Lailasana Limited | Financial services | 2018 |
| Laith ALI Investment Ltd | Construction | 2023 |
| Lake & Co. (Harrow) Limited | Professional & scientific | 2008 |
| Lake Mary Ltd | Real estate | 2024 |
| Lakeview Property Services Limited | Real estate | 2017 |