| Logixics Limited | Transport & logistics | 2019 |
| Logmaterex Ltd | Wholesale & retail | 2018 |
| Logo Trading UK Limited | Wholesale & retail | 2024 |
| Loidis Group Limited | Administrative & support | 2011 |
| Loidis Sport Limited | Extraterritorial | 2014 |
| Loiner Limited | Construction | 2014 |
| Lojohn UK Ltd | Wholesale & retail | 2024 |
| Lolarealz Limited | Real estate | 2025 |
| Lomax Lettings Ltd | Real estate | 2021 |
| London Academy of Business Ltd | Information & communication | 2017 |
| London Bolt & NUT Company Limited | Wholesale & retail | 1975 |
| London Gate Solutions Ltd | Manufacturing | 2018 |
| London Professional Qualifications Limited | Education | 2025 |
| London Red BUS Souvenirs & Gifts Limited | Wholesale & retail | 2008 |
| London Supplementary School of Excellence Ltd | Education | 2025 |
| Londyne Limited | Financial services | 2016 |
| Longbeck Holmes Ltd | Real estate | 2020 |
| Longside Motors Limited | Wholesale & retail | 2013 |
| Longside Parking Ltd | Administrative & support | 2017 |
| Look Again Limited | Wholesale & retail | 1981 |
| Loom Flooring Co Ltd | Wholesale & retail | 2021 |
| Loomo Limited | Wholesale & retail | 2025 |
| Looney Golf Ltd | Arts & recreation | 2021 |
| Loop Customer Management Limited | Administrative & support | 1999 |
| Loopluxe Limited | Wholesale & retail | 2025 |
| Loot Liquidations Ltd | Wholesale & retail | 2026 |
| Lopez Neary Limited | Professional & scientific | 2006 |
| Lorry Crane Services Limited | Manufacturing | 2019 |
| Lost City Tattoo Ltd | Arts & recreation | 2026 |
| LOT 33 Ltd | Real estate | 2025 |
| Lotmany Investments Limited | Transport & logistics | 2026 |
| Lotostransport Ltd | Transport & logistics | 2022 |
| Lottie Rose Luxury Salon Ltd | Other services | 2023 |
| Loud Cosmetics Ltd | Extraterritorial | 2022 |
| Loud Social Co CIC | Administrative & support | 2026 |
| Louis Cardin UK Ltd | Wholesale & retail | 2016 |
| Louisville Group Ltd | Hospitality | 2025 |
| Love 2 Kare Ltd | Professional & scientific | 2023 |
| Love Balooms Ltd | Wholesale & retail | 2025 |
| Love Bites Limited | Manufacturing | 2000 |
| Love Blinds Ltd | Wholesale & retail | 2026 |
| Love Donner (Yorkshire) Ltd | Hospitality | 2023 |
| Love Donner Express Ltd | Hospitality | 2025 |
| Love Fabrics Ltd | Wholesale & retail | 2022 |
| Love Health Ltd | Manufacturing | 2021 |
| Love Interiors Ltd | Manufacturing | 2024 |
| Love Lace Ltd | Wholesale & retail | 2023 |
| Love Living UK Ltd | Wholesale & retail | 2025 |
| Love My Barakah Limited | Hospitality | 2025 |
| Love Shakes Limited | Hospitality | 2022 |
| Love Yours Truly Ltd | Wholesale & retail | 2024 |
| Loveadeyele Ltd | Administrative & support | 2020 |
| Loveauraproperties Ltd | Real estate | 2024 |
| Loveclough Holdings Ltd | Construction | 2023 |
| Lovegrillish Limited | Hospitality | 2020 |
| Lovegrove Leisure Limited | Hospitality | 2012 |
| Lovenest Homes Ltd | Real estate | 2006 |
| Lovepizza BFD Ltd | Hospitality | 2024 |
| Loveshack Cards Ltd | Manufacturing | 2024 |
| LOW Acre Farm Ltd | Wholesale & retail | 2023 |
| LOW Insurance Brokers Limited | Financial services | 2008 |
| LOW Moor Local Limited | Wholesale & retail | 2023 |
| Lowe & Sons Roofing Ltd | Construction | 2022 |
| Lower Bailey Fold Farm Plant & Machinery Ltd | Wholesale & retail | 2025 |
| Lower Grange Convenience Store Ltd | Wholesale & retail | 2012 |
| Lowlands Nursery Limited | Wholesale & retail | 1998 |
| Loxley Marketing Ltd | Professional & scientific | 2021 |
| Loxton Online Limited | Wholesale & retail | 2020 |
| LP Nexus Ltd | Wholesale & retail | 2025 |
| LPA5069 Ltd | Education | 2023 |
| LPH Traders Ltd | Wholesale & retail | 2026 |
| Lphf Investments Limited | Real estate | 2021 |
| LPS Global Solutions Ltd | Wholesale & retail | 2024 |
| LPS Solicitors Limited | Professional & scientific | 2006 |
| Lpva Solutions Limited | Administrative & support | 2023 |
| LQ Building Services Ltd | Construction | 2019 |
| LR Bazaar Limited | Wholesale & retail | 2023 |
| LRA Developments Limited | Construction | 2025 |
| LRD Retail Limited | Hospitality | 2022 |
| Lruk (Holdings) Limited | Wholesale & retail | 1909 |
| Lruk (Retail) Limited | Wholesale & retail | 1910 |
| LSA Industries Limited | Other services | 2021 |
| LSE21 Limited | Hospitality | 2025 |
| Lsingh Couriers Limited | Transport & logistics | 2025 |
| LSN Consultancy Ltd | Information & communication | 2024 |
| LT Garage Services Limited | Manufacturing | 2021 |
| LTA Site Service's Ltd | Construction | 2026 |
| LTR10 Creative Ltd | Information & communication | 2018 |
| LTS Draughting Ltd | Professional & scientific | 2019 |
| LU Holdings Limited | Real estate | 2016 |
| Lubico Limited | Wholesale & retail | 2000 |
| Lubna Holdings Limited | Financial services | 2020 |
| Luby Hub Ltd | Wholesale & retail | 2025 |
| Lucas&Jessica Transport Ltd | Transport & logistics | 2019 |
| Lucki Kaur Ltd | Information & communication | 2025 |
| Lucky Foodservices Ltd | Wholesale & retail | 2026 |
| Lucky Garden Food Ltd | Hospitality | 2026 |
| Lucky Motor House (UK) Ltd | Wholesale & retail | 2018 |
| Lucky Stars Consultant Limited | Education | 2025 |
| Luckys Bradford Ltd | Hospitality | 2025 |