| Liya Services Limited | Information & communication | 2019 |
| Liyu Technology Co., Ltd | Information & communication | 2024 |
| LIZ Bisset Coaching and Consultancy Limited | Professional & scientific | 2017 |
| LIZ King Architects Limited | Professional & scientific | 2024 |
| Lizard Monitoring Limited | Other services | 2011 |
| LJH Advisory Limited | Professional & scientific | 2025 |
| LK Catering and Events Limited | Hospitality | 2020 |
| Lknas Limited | Wholesale & retail | 2025 |
| Lkotkas Photography Ltd | Professional & scientific | 2020 |
| LLA Taxis Ltd | Transport & logistics | 2026 |
| Llamatek Limited | Manufacturing | 1996 |
| Llamaxy Limited | Wholesale & retail | 2021 |
| Llano Technology Ltd | Wholesale & retail | 2021 |
| LLC Navarro Limited | Manufacturing | 2021 |
| Llggm Ltd | Financial services | 2015 |
| Llingr Software Ltd | Information & communication | 2026 |
| Llins Technology Ltd | Manufacturing | 2024 |
| Lloyd Fredericks Limited | Professional & scientific | 2000 |
| Llux AI Limited | Information & communication | 2025 |
| LLZ Trade Ltd | Wholesale & retail | 2025 |
| LM and Sons Property Management Limited | Real estate | 2024 |
| LM Consultancy Limited | Wholesale & retail | 2002 |
| LM Locums Ltd | Health & social care | 2023 |
| Lmbs Willingham Ltd | Wholesale & retail | 2024 |
| Lmgaviation Ltd | Manufacturing | 2024 |
| LMN Investments Ltd | Real estate | 2016 |
| Lmvp Telemedicine Limited | Health & social care | 2020 |
| LN Development Ltd | Construction | 2023 |
| LN Properties Limited | Construction | 2021 |
| Lnnovalink Limited | Wholesale & retail | 2025 |
| LNS Healthcare Limited | Wholesale & retail | 2020 |
| Lnsq Limited | Real estate | 2022 |
| Lobo-Ai Ltd | Information & communication | 2024 |
| Local Crescent Management Company Limited | Households | 2019 |
| Local Roofing Solutions London Limited | Construction | 2025 |
| Local Secrets Ltd | Information & communication | 2024 |
| Localhops Limited | Transport & logistics | 2025 |
| Localizemagic Ltd | Professional & scientific | 2023 |
| Location FIX Limited | Information & communication | 2021 |
| Loci Interiors Ltd | Professional & scientific | 2004 |
| Locking Parklands (Phase 5 Block 2) Management Company Limited | Households | 2022 |
| Locking Parklands (Phase 5 Blocks 1 and 3) Management Company Limited | Households | 2021 |
| Lode and District Social Club Limited | Other services | 1998 |
| Lode Heritage Ltd | Professional & scientific | 2024 |
| Lode Station Court Limited | Households | 1992 |
| Lodge Property Services Ltd | Real estate | 2014 |
| LOE & Lancaster Ltd | Professional & scientific | 2022 |
| LOE & Lancaster Properties Ltd | Real estate | 2023 |
| Loft Professionals Limited | Construction | 2017 |
| Logan Construction Limited | Extraterritorial | 1994 |
| Logan Developments Limited | Extraterritorial | 1993 |
| Logan Homes (Braughing) Limited | Construction | 2019 |
| Logan Homes (Fulbourn) Limited | Construction | 2019 |
| Logan Homes Limited | Construction | 2004 |
| Logan Investments Limited | Administrative & support | 1998 |
| Logex Solutions Limited | Transport & logistics | 2025 |
| Logibox Limited | Information & communication | 2022 |
| Logic Adjusting Ltd | Health & social care | 2025 |
| Logic Arts Limited | Information & communication | 1976 |
| Logic Carc Industria Eletronica Ltd | Manufacturing | 2026 |
| Logic Mechanical Service Contractors Limited | Administrative & support | 2013 |
| Logical Resolution Ltd. | Professional & scientific | 2004 |
| Logicbricks Ltd | Wholesale & retail | 2024 |
| Logicscaffolding Limited | Extraterritorial | 2006 |
| Logikor UK Limited | Transport & logistics | 2021 |
| Logiq Labs Ltd | Information & communication | 2025 |
| Logtec Innovation Limited | Information & communication | 2022 |
| Lohman Holdings Ltd | Financial services | 2019 |
| Loho Ltd | Information & communication | 2010 |
| Loke and Mackenzie Limited | Professional & scientific | 2013 |
| LOL Logistics Ltd | Transport & logistics | 2026 |
| LOL. Limited | Manufacturing | 2024 |
| Lomas Energy (UK) Limited | Other services | 2017 |
| London Academy of Technology and Management Ltd | Education | 2023 |
| London and Woking Properties Limited | Other services | 1999 |
| London Blinds and Curtains Ltd | Manufacturing | 2021 |
| London Centre for the Humanities | Arts & recreation | 2023 |
| London Clemong Fiber Art International Trading Co., Ltd | Manufacturing | 2024 |
| London Data Consulting Limited | Information & communication | 2003 |
| London Dream Estates UK Ltd | Real estate | 2026 |
| London Fridays Company Limited | Wholesale & retail | 2018 |
| London Fuel Limited | Wholesale & retail | 2013 |
| London Maritime Arbitration Legal Services Ltd | Professional & scientific | 2016 |
| London Rental Flats Limited | Real estate | 2017 |
| London Road (Newport) LLP | | 2017 |
| London Road Apartments Limited | Real estate | 2005 |
| London Scene Events (UK) Ltd | Information & communication | 2023 |
| London Square (Fulham) Management Company Limited | Households | 2013 |
| London Stars Basketball Club Ltd | Arts & recreation | 2014 |
| London the Design Collective Limited | Wholesale & retail | 2026 |
| London Vitaglow Co. Ltd | Wholesale & retail | 2026 |
| Lone Medics Limited | Health & social care | 2012 |
| Long Rock Limited | Professional & scientific | 2009 |
| Longai Ltd | Wholesale & retail | 2025 |
| Longevity Hacks Ltd | Financial services | 2025 |
| Longevity World Group Ltd. | Professional & scientific | 2025 |
| Longfeng Trading Limited | Wholesale & retail | 2025 |
| Longfield Park Limited | Hospitality | 2024 |
| Longfor International Inc Limited | Real estate | 2025 |
| Longfu Electronics Co., Ltd | Extraterritorial | 2011 |