| Lakereed Limited | Hospitality | 2024 |
| Lakeshore Care Ltd | Other services | 2012 |
| Lakshan GRO Ltd | Wholesale & retail | 2025 |
| Lakshmikha Property Limited | Real estate | 2022 |
| Laleham Court Residents Limited | Households | 2001 |
| Lambert Olive Ltd | Professional & scientific | 2020 |
| Lamys Limited | Real estate | 2022 |
| Lana Export Ltd | Other services | 2023 |
| Lancaster Court (Sutton) Management Company Limited | Households | 1990 |
| Land and Commercial Consulting Limited | Real estate | 2023 |
| Land Edge International Ltd | Real estate | 2023 |
| Land Inspire Limited | Administrative & support | 2015 |
| Landlord Rescue Limited | Professional & scientific | 2024 |
| Landseer Road (Sutton) Limited | Households | 1999 |
| Lang and TAM Co. Limited | Administrative & support | 2016 |
| Langley House Holding Ltd | Hospitality | 2022 |
| Langley House Hotel Ltd | Hospitality | 2022 |
| Lanham-Brown Dance Ltd | Education | 2015 |
| Lanhill Road Investment Limited | Real estate | 2018 |
| Lanmor Consulting Limited | Administrative & support | 2005 |
| Lanson Computers Limited | Information & communication | 1993 |
| Lantern Engineering and Trading Ltd | Energy | 2024 |
| Lantern Hill Holdings Ltd | Real estate | 2024 |
| Lantern Hill Ltd | Real estate | 2024 |
| LAR Finance Limited | Professional & scientific | 2009 |
| Larden Road Holdings Limited | Real estate | 2016 |
| Larkspur House Ltd | Hospitality | 2022 |
| Laserfair Limited | Information & communication | 1996 |
| Lasergate (UK) Ltd. | Construction | 2016 |
| Lashcult Ltd | Other services | 2025 |
| Last Bite Wimbledon Ltd | Hospitality | 2025 |
| Last LAP Television Limited | Information & communication | 2014 |
| Last Laugh Theatre Ltd | Arts & recreation | 2024 |
| Last Light Cinema Limited | Information & communication | 2014 |
| Latch Ventures Limited | Real estate | 2015 |
| Latest Advisory Limited | Professional & scientific | 2025 |
| Latest Bookkeeping Limited | Professional & scientific | 2024 |
| Laughing Dawn TCG Limited | Wholesale & retail | 2026 |
| Laughton Property Services Limited | Administrative & support | 2020 |
| Laura Elizabeth Mcneill Limited | Extraterritorial | 2013 |
| Laurel Manor Freehold Limited | Real estate | 2013 |
| Laurel Manor Management (NO. 1) Limited | Real estate | 1974 |
| Laurel Manor Management (NO. 2) Limited | Real estate | 1974 |
| Laurel Manor RTM Company Limited | Real estate | 2009 |
| Lauren Executive VA Ltd | Financial services | 2021 |
| Lavender Clearances Ltd | Water & waste | 2011 |
| Lavender Movements Ltd | Transport & logistics | 2016 |
| Lavi News Ltd | Wholesale & retail | 2016 |
| Laviananisha Retail Ltd | Wholesale & retail | 2014 |
| Lawrence CRE Consulting Limited | Professional & scientific | 2017 |
| Lawrence Dallaglio Limited | Arts & recreation | 1997 |
| Lawsan Limited | Wholesale & retail | 2013 |
| LB Baking Limited | Manufacturing | 2024 |
| LBD Ministries Limited | Education | 2023 |
| LBT Motorcycle Recovery Ltd | Wholesale & retail | 2025 |
| LC Executive Cars Ltd | Transport & logistics | 2025 |
| LC Premier Consulting Ltd | Financial services | 2025 |
| LC1LUXURYCONSTRUCTION Ltd | Construction | 2019 |
| LCC - London Carbon Consultancy Limited | Real estate | 2023 |
| LCD Pixel Construction Ltd | Construction | 2016 |
| LD Consultancy Ltd | Professional & scientific | 2025 |
| LD Professional Services Ltd | Construction | 2024 |
| LD93 Ltd | Construction | 2011 |
| LE Chien (London) Limited | Administrative & support | 2024 |
| LE Chien Limited | Other services | 2012 |
| LE Grand Chien Limited | Other services | 2013 |
| LE Mesnil Management Limited | Administrative & support | 2006 |
| Leading Paws Ltd | Professional & scientific | 2020 |
| LEADING4PAWS Ltd | Professional & scientific | 2022 |
| Leadout Advisory Limited | Professional & scientific | 2024 |
| Leah's Little'Uns Limited | Health & social care | 2024 |
| Lean Engineering Services Limited | Professional & scientific | 2026 |
| Leap Thirtytwo Ltd | Administrative & support | 2022 |
| Leapfrog Clinic Ltd | Health & social care | 2011 |
| Learn Love Live Ltd | Extraterritorial | 2021 |
| Learna Education Ltd | Education | 2003 |
| Learning and Skills Consultancy Ltd | Education | 2015 |
| Lease Option Properties Limited | Information & communication | 2008 |
| Leather World Ltd | Wholesale & retail | 2019 |
| Ledbury Homes Limited | Real estate | 2014 |
| LEE Building Construction Limited | Construction | 2018 |
| LEE Dean Supreme Scaffolding Ltd | Construction | 2021 |
| Leeds Industries (UK) Ltd | Real estate | 2016 |
| Leela Dhar Limited | Construction | 2019 |
| Legacy Transport Ltd | Transport & logistics | 2025 |
| LEGACY81 Ltd | Real estate | 2020 |
| Legion Security Services London Ltd | Administrative & support | 2025 |
| Legionella Management Solutions Ltd | Water & waste | 2023 |
| Leiasoft Ltd | Other services | 2018 |
| LEK (Nominees) Limited | Financial services | 2009 |
| LEK Securities UK Limited | Financial services | 2009 |
| Lemuria Soft Limited | Information & communication | 2017 |
| Lenat International (UK) Limited | Other services | 1986 |
| Lentis Ltd | Health & social care | 2013 |
| Lenxdipix Limited | Wholesale & retail | 2025 |
| LEO Academy Trust | Education | 2011 |
| Leon Building Construction Ltd | Construction | 2024 |
| Leonardslee Limited | Wholesale & retail | 2010 |
| Leonie Brown Coaching Academy Ltd | Education | 2025 |
| Leonrise Limited | Hospitality | 2024 |