| Lashdoutbc Limited | Other services | 2025 |
| Lasherie Ltd | Other services | 2022 |
| Lashley Holdings Limited | Education | 2022 |
| Latest Developments UK Limited | Real estate | 2008 |
| Latif Autohaus Ltd | Wholesale & retail | 2025 |
| Latin Love Limited | Arts & recreation | 2017 |
| Latraline Limited | Construction | 2008 |
| Lauca Drylining &Cleaning Ltd | Construction | 2019 |
| Laundry Web App Limited | Other services | 2020 |
| Laura I. Art Gallery CIC | Wholesale & retail | 2020 |
| Laurrum Ltd | Wholesale & retail | 2026 |
| Laurysa Ltd | Wholesale & retail | 2026 |
| Lawrence College London Limited | Education | 2023 |
| Layer 83 Ltd | Arts & recreation | 2011 |
| LBD Childcare Activity Ltd | Education | 2016 |
| LBD Homes Ltd | Real estate | 2020 |
| LBD Tuition Centre Ltd | Education | 2016 |
| LCA Maintenance Ltd | Construction | 2018 |
| LCB Distribution Limited | Extraterritorial | 2017 |
| LCB Logistics Limited | Extraterritorial | 2017 |
| LCB Tilbury Limited | Extraterritorial | 2001 |
| Lccca Ltd | Professional & scientific | 2025 |
| LDN Properties Group Limited | Real estate | 2024 |
| LE AJ Ltd | Wholesale & retail | 2019 |
| Leadman Brothers Ltd | Information & communication | 2018 |
| Leaf Green Services Ltd | Real estate | 2024 |
| Learn Skooly Ltd | Information & communication | 2025 |
| Learnabot Ltd | Transport & logistics | 2022 |
| Leather Groove Ltd | Manufacturing | 2025 |
| Lebante Healthcare Ltd | Health & social care | 2016 |
| LEE Bhalla Properties Limited | Real estate | 2021 |
| Leftley Inventories Ltd | Real estate | 2026 |
| Legacy International Ltd | Professional & scientific | 2009 |
| Legendary Consultants Ltd | Professional & scientific | 2025 |
| Legendos Limited | Wholesale & retail | 2012 |
| Lehd Solutions Ltd | Administrative & support | 2024 |
| Leizo London Limited | Manufacturing | 2025 |
| Leke Best Buys Ltd | Wholesale & retail | 2025 |
| Leland International Ltd | Professional & scientific | 2024 |
| Lemaliuk Ltd | Transport & logistics | 2025 |
| Lenmar Properties Ltd | Real estate | 2025 |
| Lenncar Ltd | Construction | 2025 |
| Lenoz Investments Limited | Real estate | 2025 |
| Lens Prop Ltd | Real estate | 2020 |
| Lentzy Ltd | Hospitality | 2020 |
| LEO Design Systems Limited | Manufacturing | 2009 |
| LEO Elevators Limited | Construction | 2018 |
| LEO Estate Ltd | Real estate | 2020 |
| Leonardo Auto Centre Ltd | Wholesale & retail | 2018 |
| Leone Electrics Limited | Manufacturing | 2010 |
| LER General Building Ltd | Construction | 2024 |
| Lerners Lets Ltd | Real estate | 2022 |
| Letmax Ltd | Hospitality | 2023 |
| Level UP Construct Ltd | Construction | 2024 |
| Level Web Limited | Information & communication | 2015 |
| Levtar London Limited | Manufacturing | 2025 |
| Lewens Consultancy Limited | Professional & scientific | 2015 |
| Lexaro Ltd | Real estate | 2025 |
| Lexquity Ltd | Information & communication | 2026 |
| Leyabelle Estetic Clinic Ltd | Other services | 2024 |
| Leyit Limited | Information & communication | 2025 |
| Leysan Properties Limited | Real estate | 2020 |
| Lhpi Ltd | Construction | 2026 |
| LIA P Services Ltd | Transport & logistics | 2014 |
| Lia's Pharma Ltd | Professional & scientific | 2015 |
| Libertie Service Limited Limited | Other services | 2018 |
| Life After Brexit Employment Agency Limited | Administrative & support | 2021 |
| Life Concerns Limited | Wholesale & retail | 2025 |
| Lifeskill Training Ltd | Education | 2022 |
| Lift Control Panels Ltd | Manufacturing | 2022 |
| Liger Services Ltd | Administrative & support | 2019 |
| Light Haven Care Ltd | Health & social care | 2024 |
| Lightfantasia Limited | Construction | 2023 |
| Lighthouse Professional Development Ltd | Education | 2026 |
| Lijo Services Ltd | Administrative & support | 2025 |
| Lika Empowerment CIC | Other services | 2025 |
| Lila's Jewellery Ltd | Wholesale & retail | 2026 |
| Lilla Accessories Ltd | Wholesale & retail | 2024 |
| Lily of the Valley London Limited | Wholesale & retail | 2019 |
| Line System Ltd | Construction | 2025 |
| Linear Shipping Ltd | Wholesale & retail | 2026 |
| Link and Learn Ltd | Education | 2023 |
| Link Direct Ltd | Transport & logistics | 2022 |
| Linkon Accountants Limited | Professional & scientific | 2023 |
| Linktechnix Ltd | Wholesale & retail | 2020 |
| Linkworths Limited | Professional & scientific | 2015 |
| Liquidfi Ltd | Information & communication | 2017 |
| Liquidity Ventures Limited | Financial services | 2024 |
| Lismkt Limited | Professional & scientific | 2025 |
| Lithuanian Beer Limited | Wholesale & retail | 2002 |
| Little Grow Limited | Education | 2026 |
| Little Hoppers Soft Play Ltd | Health & social care | 2026 |
| LIV & Dewey Recycling UK Ltd | Water & waste | 2022 |
| Live Smarter Ltd. | Information & communication | 1999 |
| Living Side Developers Limited | Hospitality | 2025 |
| Living Side Homes Limited | Water & waste | 2025 |
| Living Word Healthcare C.I.C. | Administrative & support | 2026 |
| Livingstone Health Care Limited | Health & social care | 2012 |
| Livinimage Ltd | Information & communication | 2016 |
| Lizscholl Care Limited | Wholesale & retail | 2015 |