| LT Trading Ltd | Wholesale & retail | 2025 |
| Lubbion Limited | Wholesale & retail | 2025 |
| Lucas Acoustic International Electronic Ltd | Manufacturing | 2022 |
| Lucas Designs 3D Ltd | Manufacturing | 2025 |
| Lucca Properties Ltd | Real estate | 2023 |
| Lucency Ltd | Health & social care | 2023 |
| Lucent Nine Ltd | Information & communication | 2015 |
| Lucian GEM International Ltd | Wholesale & retail | 2020 |
| Lucido Cleaning Ltd | Administrative & support | 2023 |
| Lucidq Ltd | Information & communication | 2025 |
| Lucky Cristowe Holdings Limited | Real estate | 2025 |
| Lucky Panda Telford Limited | Hospitality | 2025 |
| Lucy Anne VA Limited | Administrative & support | 2026 |
| Luhaky Limited | Wholesale & retail | 2025 |
| Luisa Loveday Ltd. | Manufacturing | 2011 |
| Luke Hassall Photography Ltd | Professional & scientific | 2020 |
| Luke Tonin Ltd | Information & communication | 2024 |
| Luke Turpin Productions Ltd | Information & communication | 2025 |
| Lullabyfeltart Limited | Wholesale & retail | 2026 |
| Lulu and BOO Jewellery Limited | Manufacturing | 2023 |
| Luma Market Ltd | Wholesale & retail | 2026 |
| Lumememo Ltd | Wholesale & retail | 2026 |
| Lumen MM Ltd | Information & communication | 2025 |
| Lumi World Ltd | Manufacturing | 2025 |
| Lumiere Smiles Limited | Health & social care | 2026 |
| Lumigo Limited | Wholesale & retail | 2025 |
| Lumin Digisol Ltd | Information & communication | 2024 |
| Lumin Mags Limited | Wholesale & retail | 2025 |
| Lumina Distribution Limited | Wholesale & retail | 2026 |
| Lumina Retail UK Ltd | Wholesale & retail | 2026 |
| Luminans Ltd | Wholesale & retail | 2025 |
| Luminous Stone Limited | Wholesale & retail | 2025 |
| Lumipaws Ltd | Wholesale & retail | 2026 |
| Lumipro Cleaning Ltd | Administrative & support | 2025 |
| Lumira Medical Limited | Wholesale & retail | 2026 |
| Lumis Inspira Ltd | Information & communication | 2025 |
| Lumivia Ltd | Manufacturing | 2025 |
| Lumivista Studios Ltd | Wholesale & retail | 2025 |
| Luna's Lounge Ltd | Hospitality | 2025 |
| Lunar Year Limited | Professional & scientific | 2014 |
| Lunara Ultrasound Services Ltd | Health & social care | 2025 |
| Lundun Management Ltd | Households | 2024 |
| Lunele Ltd | Financial services | 2022 |
| Luneorae Studio Ltd | Wholesale & retail | 2026 |
| Lunexar Ltd | Wholesale & retail | 2025 |
| Lunivy Ltd | Manufacturing | 2026 |
| Lunovi Limited | Professional & scientific | 2015 |
| Lunproky Limited | Real estate | 2023 |
| Lunyns Ltd | Financial services | 2023 |
| Luqman Traders Ltd | Wholesale & retail | 2025 |
| Lush Beads Limited | Wholesale & retail | 2013 |
| Lustriq Facilities Limited | Administrative & support | 2026 |
| Luvabl Limited | Wholesale & retail | 2025 |
| LUX Holiday Lettings Ltd | Other services | 2024 |
| Luxe Cheveux Ltd | Wholesale & retail | 2025 |
| Luxe London Concierge Ltd | Other services | 2020 |
| Luxe Nomadica Ltd | Administrative & support | 2025 |
| Luxen Cleaning Ltd | Administrative & support | 2025 |
| Luxiana Ltd | Wholesale & retail | 2025 |
| Luxo Properties Management Ltd | Real estate | 2024 |
| Luxora Trando Ltd | Wholesale & retail | 2025 |
| Luxury Living Estates Limited | Real estate | 2024 |
| Luxvio Ltd | Wholesale & retail | 2025 |
| Luxxiva Limited | Manufacturing | 2019 |
| Luxxsheets Ltd | Information & communication | 2023 |
| LUZ Group Ltd | Financial services | 2026 |
| LUZ Properties 2 Ltd | Real estate | 2026 |
| Luzon Trading Ltd | Wholesale & retail | 2026 |
| LVK Capital Limited | Administrative & support | 2012 |
| Lvmc Limited | Households | 2021 |
| Lycore Ltd | Other services | 2026 |
| LYN Products Ltd | Wholesale & retail | 2026 |
| Lynique Ltd | Other services | 2022 |
| Lyxorium Group Ltd | Professional & scientific | 2026 |
| M & Co. Cleaning Ltd | Administrative & support | 2025 |
| M and Sons Recovery Ltd | Transport & logistics | 2026 |
| M Asad Iqbal Ltd | Wholesale & retail | 2025 |
| M G Smith Holdings Limited | Financial services | 2026 |
| M Gravity Limited | Real estate | 2021 |
| M S Burton Holdings Limited | Real estate | 2021 |
| M&T Global Holdings Limited | Wholesale & retail | 2026 |
| M.A Soul Enterprise Ltd | Manufacturing | 2025 |
| M.E. Resources Ltd | Professional & scientific | 2008 |
| M.H. OIL & GAS Construction Consultancy Ltd | Professional & scientific | 2019 |
| M11 Holdings Limited | Financial services | 2023 |
| M3 Company Studios Ltd | Information & communication | 2024 |
| MA Consulting Engineers Ltd | Professional & scientific | 2025 |
| Ma&Mg Harris Urology Services Ltd | Health & social care | 2022 |
| MAB Enterprises Limited | Wholesale & retail | 2011 |
| Mabalot Holdings Ltd | Information & communication | 2026 |
| Mabushi Life Ltd | Education | 2024 |
| Macey Solutions Limited | Wholesale & retail | 2022 |
| Macspire Ltd | Wholesale & retail | 2021 |
| Made by Atomic Ltd | Information & communication | 2026 |
| Made by Ernie Ltd | Professional & scientific | 2014 |
| Made UP Design & Illustration Ltd | Professional & scientific | 2009 |
| Made With Love in India Ltd | Wholesale & retail | 2024 |
| Madefresh Ltd | Information & communication | 2020 |
| Madeley Media Ltd | Financial services | 2013 |
| Madisonville Limited | Wholesale & retail | 2025 |