| LMP Global Limited | Wholesale & retail | 2022 |
| LN Removal Services Ltd | Transport & logistics | 2026 |
| LNS of ST Asaph Ltd | Wholesale & retail | 2019 |
| Loafi Bakehouse Ltd | Hospitality | 2025 |
| LOB Distributions Ltd | Wholesale & retail | 2025 |
| Lobi Eco Ltd | Real estate | 2025 |
| LOC Property Ltd | Construction | 2026 |
| Loch Roag Limited | Information & communication | 2014 |
| Lock Property Finders Ltd | Other services | 2023 |
| Lockmanor Limited | Construction | 2002 |
| Lockshield Ltd | Construction | 2025 |
| Lockwood Logistics Ltd | Transport & logistics | 2019 |
| Locumsj Limited | Health & social care | 2022 |
| Lodhry Ltd | Wholesale & retail | 2021 |
| LOE Bank Motors Ltd | Wholesale & retail | 2003 |
| Lofcom Limited | Professional & scientific | 2017 |
| Logistica Facilities Management Ltd | Construction | 2012 |
| Logistica Group Holdings Ltd | Professional & scientific | 2017 |
| Logistica UK & Europe Ltd | Transport & logistics | 2017 |
| Lola's PUB Company Ltd | Hospitality | 2020 |
| Lollypop Holcombe Limited | Wholesale & retail | 2013 |
| Longden & Cook Limited | Professional & scientific | 2008 |
| Longden & Cook Real Estate Limited | Real estate | 2002 |
| Longy Transport (Walmersley) Limited | Transport & logistics | 2025 |
| Loop Networks Ltd | Construction | 2007 |
| Lorapat Standard Care & Geotec Services Limited | Health & social care | 2020 |
| Lord and Abbott Properties Limited | Households | 2020 |
| Loren Anthony Page Ltd | Administrative & support | 2022 |
| Loris Brook Ltd | Professional & scientific | 2017 |
| Losanglespizza Ltd | Hospitality | 2025 |
| Lost BOY Brands Ltd | Wholesale & retail | 2024 |
| Lostock Installations Limited | Construction | 2012 |
| LOT168 Company Limited | Hospitality | 2025 |
| Lotus TCG Ltd | Wholesale & retail | 2026 |
| Lotus Wholesale Holdings Ltd | Financial services | 2022 |
| LOTUS91 Ltd | Wholesale & retail | 2024 |
| Louellbeauty Ltd | Other services | 2026 |
| Lovatts Solar Solutions Limited | Construction | 2023 |
| Love Lets Ltd | Real estate | 2022 |
| Love Park Penryn C.I.C. | Arts & recreation | 2023 |
| Love Scents & Accessories Ltd | Wholesale & retail | 2003 |
| Lovefootball CIC | Professional & scientific | 2019 |
| LOW Wood Commercial Warehouse Ltd | Real estate | 2024 |
| Lower Gollinrod Farm Limited | Agriculture & fishing | 2017 |
| Lowes Park Golf Club Limited(The) | Arts & recreation | 1930 |
| Loxbury Limited | Extraterritorial | 2021 |
| Loxem Associates Limited | Extraterritorial | 2021 |
| Loyalty Before Ltd | Wholesale & retail | 2019 |
| LP Laser Beauty Clinic Ltd | Other services | 2025 |
| LPC Invest Limited | Real estate | 2018 |
| Lpcs Euthanasia Ltd | Other services | 2021 |
| LPG Estates Limited | Administrative & support | 2017 |
| LPS Capital Ltd | Information & communication | 2024 |
| LS Tutoring LLP | | 2025 |
| LSB Contracting Services Limited | Construction | 2026 |
| LSJ Property Developments Ltd | Real estate | 2026 |
| LSN Holdings Limited | Financial services | 2018 |
| Lucas Automated Access Ltd | Administrative & support | 2026 |
| Lucas Interpreting Limited | Education | 2012 |
| Lucelli Retail Limited | Wholesale & retail | 2021 |
| Lucky Charm Marketing Limited | Professional & scientific | 2024 |
| Lucky RAF Investments Ltd | Real estate | 2025 |
| Lucky RAF Ltd. | Wholesale & retail | 2012 |
| Lucky RAF Properties Ltd | Real estate | 2021 |
| Luis Clean Ltd | Administrative & support | 2025 |
| Lukas Haitzmann Ventures Limited | Arts & recreation | 2024 |
| Lukasz Bielski Transport Ltd. | Transport & logistics | 2017 |
| Luke David Harris Limited | Administrative & support | 2019 |
| Luma Digital Marketing Ltd | Professional & scientific | 2022 |
| Lumas PM Ltd | Construction | 2022 |
| Lumpot Ltd | Transport & logistics | 2021 |
| Lumus Solutions Ltd | Professional & scientific | 2019 |
| Lumzo Industries Ltd | Wholesale & retail | 2026 |
| Lunchbox Films Ltd | Information & communication | 2021 |
| Lurinves Ltd | Wholesale & retail | 2018 |
| Lush Laser UK Ltd | Other services | 2026 |
| Lushblue Ltd | Wholesale & retail | 2026 |
| Luvvly Jubbly Limited | Other services | 2015 |
| LUX Tattoo Limited | Other services | 2021 |
| Luxeat Consulting Ltd | Hospitality | 2018 |
| Luxefamilytravel Limited | Professional & scientific | 2024 |
| Luxonis LED Ltd | Manufacturing | 2024 |
| Luxvi Motors Ltd | Wholesale & retail | 2025 |
| LVT Flooring North West Limited | Wholesale & retail | 2025 |
| LW Accountants Limited | Professional & scientific | 2007 |
| LWM Mortgages Limited | Financial services | 2017 |
| LX Holdings Limited | Professional & scientific | 2017 |
| Lycar Education Ltd | Education | 2025 |
| Lyna Ltd | Hospitality | 2019 |
| Lyndakaren Ltd | Hospitality | 2020 |
| Lynx X Transport Ltd | Transport & logistics | 2026 |
| Lyons Mortgage Services Ltd | Financial services | 2019 |
| Lytewater Limited | Manufacturing | 2018 |
| M & E Developments Ltd | Real estate | 2026 |
| M & J (Bury) Ltd | Hospitality | 2024 |
| M & M Property Portfolio Ltd | Real estate | 2025 |
| M & O Business Solutions Ltd | Professional & scientific | 2025 |
| M & R Leisure Ltd | Arts & recreation | 2025 |
| M & R Windows Limited | Wholesale & retail | 2019 |
| M 4 Mart Limited | Manufacturing | 2018 |