| L K Foods Private Limited | Wholesale & retail | 2019 |
| L' Scissors Limited | Other services | 2009 |
| L3 Group Ltd | Administrative & support | 1988 |
| L40 Ltd | Professional & scientific | 2022 |
| Lagaa Limited | Wholesale & retail | 2025 |
| Lakshmi Strategy Ltd | Financial services | 2021 |
| Lampstand CIC | Other services | 2024 |
| Lancaro Holdings Ltd | Real estate | 2025 |
| Land Services Limited | Professional & scientific | 1996 |
| Landmark Inc Ltd | Construction | 2023 |
| Landmark Internet Limited | Information & communication | 1998 |
| Lapides Ltd | Real estate | 2022 |
| Larlar Holdings Ltd | Real estate | 2024 |
| Laser Wayz Ltd | Professional & scientific | 2023 |
| Last First Ltd | Real estate | 2022 |
| Latie Holdings Ltd | Professional & scientific | 2016 |
| Laverok Real Estate Ltd | Real estate | 2021 |
| LB Elevate Ltd | Other services | 2016 |
| LB Management Consulting Ltd | Professional & scientific | 2021 |
| Lbtc Rent Ltd | Real estate | 2021 |
| Lbtc Trading Ltd | Real estate | 2021 |
| Lccw Ltd | Other services | 2025 |
| LDN Churro Ltd | Wholesale & retail | 2024 |
| LDN Legal Partners Ltd | Professional & scientific | 2019 |
| Lead General Ltd | Wholesale & retail | 2025 |
| Leadhelix Global Ltd | Other services | 2025 |
| Leadquest Limited | | 1985 |
| Leal Technologies Ltd | Information & communication | 2018 |
| Leela Lane Ltd | Financial services | 2021 |
| Legal International Ltd | Professional & scientific | 2023 |
| Leila Enterprises Ltd | Administrative & support | 2025 |
| Lejowijo Ltd | Real estate | 2022 |
| Lemara Limited | Administrative & support | 2000 |
| Lemon Squeezee Limited | Information & communication | 2013 |
| Lemscher Property Ltd | Real estate | 2024 |
| Lemy School Ltd | Education | 2009 |
| Lerwick Payments Limited | Information & communication | 2023 |
| Lessandnic Ltd | Health & social care | 2015 |
| LET ME Dress YOU UP Limited | Wholesale & retail | 2020 |
| Leta Estate Limited | Real estate | 2023 |
| Lewin Home Renovations Ltd | Construction | 2026 |
| Libe Property Ltd | Real estate | 2021 |
| Liberty Housing Ltd | Real estate | 2022 |
| Liberty Loom Limited | Other services | 2024 |
| Life in the Old Dog YET Ltd | Information & communication | 2006 |
| Lift Run DAD Ltd | Arts & recreation | 2026 |
| Lightning Bolt Entertainment Ltd | Hospitality | 2021 |
| Lightshell Ltd | Professional & scientific | 2022 |
| Likeminded PR Ltd | Professional & scientific | 2024 |
| Lilithmedia Ltd | Other services | 2024 |
| Lindberg Properties Ltd | Real estate | 2024 |
| Lindenthal Media Ltd | Professional & scientific | 2025 |
| LINK1IT Limited | Information & communication | 2011 |
| Lionheart Legacy Ltd | Other services | 2023 |
| Little Bear Living Ltd | Hospitality | 2025 |
| Little Bear Property Investments Ltd | Real estate | 2024 |
| Little Green Hill Ltd | Real estate | 2024 |
| Little Green Hill SPV One Ltd | Real estate | 2026 |
| Little Tanks Ltd | Education | 2017 |
| Little Troopers | Professional & scientific | 2011 |
| Live Better Media Ltd | Professional & scientific | 2025 |
| Livelife Marketing Ltd | Professional & scientific | 2026 |
| Livil Real Estate Investments Ltd | Real estate | 2021 |
| Living Bright Ltd | Real estate | 2023 |
| Living Home Properties Europe Ltd | Real estate | 2023 |
| Lmbk Invest Ltd | Real estate | 2024 |
| LMN One Limited | Real estate | 2000 |
| LMN Two Limited | Real estate | 2000 |
| Lockehaven Limited | Information & communication | 2019 |
| Lodge Developments (UK) Limited | Construction | 2000 |
| Logaxio Limited | Administrative & support | 2016 |
| Lohan Homes Limited | Real estate | 2017 |
| Lokum Ltd | Real estate | 2018 |
| Lollypop Properties Limited | Financial services | 2015 |
| Lombard Hamilton Trustees LLP | | 2011 |
| London Capital Finances Ltd | Financial services | 2019 |
| London Electrical (UK) Limited | Wholesale & retail | 1994 |
| London Pubs Trading Ltd | Real estate | 2014 |
| London Scaffolding Services Ltd | Construction | 2024 |
| Loqin Limited | Wholesale & retail | 2026 |
| Lotty Travel Ltd. | Administrative & support | 2012 |
| Loulou Property Trading Ltd | Real estate | 2021 |
| Lowlands Real Estate Ltd | Real estate | 2021 |
| Loyalty Management Limited | Administrative & support | 2001 |
| Lpmtm Ltd | Wholesale & retail | 2025 |
| LRK Precision Engineering Ltd | Manufacturing | 2025 |
| LT Cancer Help Ltd | Other services | 2023 |
| LTD4U Ltd | Professional & scientific | 2013 |
| Lucent Perspectives Ltd | Professional & scientific | 2023 |
| Lucky Aces Holding Ltd | Financial services | 2026 |
| Lucky Edge Productions Limited | | 1993 |
| Lumat Properties Ltd | Real estate | 2024 |
| Luminous Universe Ltd | Other services | 2024 |
| Lumturi Ltd | Other services | 2025 |
| Lunar Flow Yoga Ltd | Other services | 2024 |
| Lunarrá Group Ltd | Real estate | 2025 |
| Lupus Tech Ltd | Information & communication | 2022 |
| Luxe Kitchens and Bedrooms Ltd | Manufacturing | 2024 |
| Luxe Projects Capital Ltd | Real estate | 2025 |
| Luxe Projects London Ltd | Real estate | 2018 |