| Lexber Holidays Limited | Professional & scientific | 2002 |
| Leya’S Healthcare Services (PVT) Ltd | Health & social care | 2017 |
| Leziko Young Leaders CIC | Education | 2024 |
| LG & a Precision Limited | Manufacturing | 2017 |
| LGS Accounting Services Limited | Professional & scientific | 2014 |
| Liberty Gate Estates Ltd | Extraterritorial | 2014 |
| Libra Estates Developments Limited | Real estate | 2004 |
| Libra Estates Limited | Real estate | 2000 |
| Licensing School Limited | Professional & scientific | 2013 |
| Lider Fire Limited | Professional & scientific | 2020 |
| Lider Solution Limited | Construction | 2023 |
| Life Blossoms Ltd | Manufacturing | 2025 |
| Life Financial Services Limited | Financial services | 2015 |
| Life IS FAB Ltd | Education | 2021 |
| Life Journey Academy Ltd | Education | 2021 |
| Life Mortgage Solutions London Limited | Financial services | 2023 |
| Lightbulb Moment Limited | Education | 2014 |
| Lightwater Cleaning Solutions Ltd | Administrative & support | 2023 |
| Lightwater One OFF Cleaning Solutions Ltd | Administrative & support | 2024 |
| Lila Developments Ltd | Real estate | 2026 |
| Lillibrooke Properties Limited | Real estate | 2022 |
| Limber Strategic Ltd | Professional & scientific | 2018 |
| Lime Croft Holdings Limited | Construction | 2024 |
| Lime Health Limited | Wholesale & retail | 2019 |
| Limecraft Repointing Ltd | Construction | 2025 |
| Limpley Stoke Properties Limited | Construction | 2014 |
| Lindback Limited | Construction | 2009 |
| Linden Residents Management Limited | Households | 2003 |
| Lindmart Property Holdings LLP | | 2020 |
| Lindsayhart Limited | Information & communication | 2026 |
| Line Eight Limited | Professional & scientific | 2024 |
| Linfu Ltd | Hospitality | 2024 |
| Lingsted Healthcare Limited | Health & social care | 2016 |
| Link Consultants Ltd | Administrative & support | 2024 |
| Links Signs Limited | Construction | 2002 |
| Linq Media Group Ltd | Information & communication | 2022 |
| Linsford Lane (Mytchett) Management Company Limited | Households | 2012 |
| Lion Plaza Propco Limited | Real estate | 2023 |
| Liphook Road Management Company | Households | 2016 |
| Liquid Studio PVT Ltd | Hospitality | 2025 |
| Liquorworld Limited | Wholesale & retail | 2006 |
| Liroo Limited | Manufacturing | 2024 |
| Lisa Armitage Ltd | Wholesale & retail | 2016 |
| Lithian Group Limited | Professional & scientific | 2025 |
| Little Dene Limited | Households | 1983 |
| Little Genius Marketing Limited | Professional & scientific | 2023 |
| Little Long Legs Ltd | Agriculture & fishing | 2025 |
| Little Poppets Childcare Limited | Health & social care | 2026 |
| Little Street Limited | Arts & recreation | 2013 |
| LIV Clean Group Ltd | Administrative & support | 2025 |
| LIV PAN Building Solutions Ltd | Construction | 2018 |
| Lives in Motion Ltd | Information & communication | 2021 |
| Liveshopping UK Ltd | Wholesale & retail | 2024 |
| Lizbet Care Limited | Health & social care | 2018 |
| LJW Commerce Ltd | Wholesale & retail | 2025 |
| Lksandys Services Ltd | Administrative & support | 2024 |
| Llethr House Vacation Club Properties Ltd. | Professional & scientific | 1996 |
| LLN Holdings Ltd | Real estate | 2026 |
| Lloyds Property Agents (Wigan) Limited | Extraterritorial | 2012 |
| Lloyds Property Agents Limited | Extraterritorial | 2013 |
| LMB Project Management Ltd | Professional & scientific | 2025 |
| LMP Living Limited | Construction | 2025 |
| LNG Transport Ltd | Transport & logistics | 2023 |
| Local Air CON Ltd | Energy | 2026 |
| Local Mortgage Solutions Ltd | Financial services | 2017 |
| Location Law Ltd | Other services | 2017 |
| Lockpoint Limited | Manufacturing | 1990 |
| Lockwhit Limited | Professional & scientific | 2026 |
| Loco LDN Ltd | Wholesale & retail | 2025 |
| Locum Providers Limited | Information & communication | 2000 |
| Locums Today Group Limited | Financial services | 2022 |
| Loft and Beyond Ltd | Manufacturing | 2025 |
| Logbooks Ltd | Information & communication | 2023 |
| Logenie Ltd | Transport & logistics | 2022 |
| Login Business Lounge Limited | Administrative & support | 2021 |
| Logistics SN Limited | Administrative & support | 2016 |
| Logon Furniture Limited | Manufacturing | 2026 |
| London Edinburgh Property Ltd | Real estate | 2019 |
| London Encore Theatre Company CIC | Arts & recreation | 2016 |
| London Heathrow Contractors Ltd | Construction | 2019 |
| London House (134 High Street) Residents Management Company Limited | Households | 2016 |
| London HR Training & Consulting Group Ltd | Professional & scientific | 2022 |
| London Jamocha Community CIC | Other services | 2013 |
| London Loft Solutions Ltd | Construction | 2018 |
| London Motoring Ltd | Wholesale & retail | 2023 |
| Longacre Rise (Block F) Chineham Limited | Households | 2010 |
| Longford Farm Estates Ltd | Real estate | 2020 |
| Longlea Limited | Health & social care | 2011 |
| Longview Property Limited | Real estate | 2023 |
| Lookerluxe Ltd | Wholesale & retail | 2024 |
| Lordforge Limited | Health & social care | 2016 |
| Loris & RAY Bracknell Ltd | Administrative & support | 2021 |
| Lorton Facilities Ltd | Wholesale & retail | 2022 |
| Lorton Solutions Ltd | Professional & scientific | 2022 |
| Lotus Alliance Wellbeing C.I.C. | Health & social care | 2013 |
| Louch Props Ltd | Information & communication | 2023 |
| Louis Tea Room Limited | Hospitality | 2020 |
| Louise D Consulting Ltd | Professional & scientific | 2022 |
| Lourdes Limited | Real estate | 2005 |
| Love From Lila XX Limited | Manufacturing | 2015 |