| LMG Building Services Limited | Construction | 2025 |
| Lmrk Properties Ltd | Construction | 2023 |
| LN Colour Ltd | Construction | 2025 |
| Lobnan Food Ltd | Hospitality | 2024 |
| Lock Serv Limited | Wholesale & retail | 2022 |
| Locksmith London Ltd | Manufacturing | 2024 |
| Logical Accounts Ltd | Professional & scientific | 2019 |
| London Arab Orchestra Ltd | Arts & recreation | 2024 |
| London Building & Civil Engineering Ltd | Construction | 2017 |
| London Car Rentals Ltd | Administrative & support | 1987 |
| London Cardiovascular Consultants Limited | Health & social care | 2018 |
| London Coatings Limited | Wholesale & retail | 2015 |
| London College of Naturopathic Medicine & Health Science | Education | 1999 |
| London Dentaire Ltd | Health & social care | 2018 |
| London Disc Golf Community Limited | Wholesale & retail | 2021 |
| London Electrical Brigade Limited | Construction | 2025 |
| London ENT Ltd | Health & social care | 2019 |
| London EYE Multimedia Ltd | Information & communication | 2014 |
| London Garden Space Ltd | Construction | 2020 |
| London Grab Limited | Water & waste | 2025 |
| London Hijama Therapy Ltd | Health & social care | 2024 |
| London Imperial Construction Ltd | Construction | 2018 |
| London International Film Productions Ltd | Information & communication | 2019 |
| London International Film Studios Ltd | Information & communication | 2019 |
| London Medical Supplies Limited | Extraterritorial | 1982 |
| London Omega Ltd | Wholesale & retail | 2023 |
| London Prime GAS Heating Plumbing Ltd | Manufacturing | 2026 |
| London Property Compliance Ltd | Wholesale & retail | 2026 |
| London Protocol Services Ltd | Transport & logistics | 2026 |
| London Puffs Ltd | Wholesale & retail | 2022 |
| London Residency Property Ltd | Real estate | 2014 |
| London Skin Surgery Ltd | Health & social care | 2021 |
| London Taekwondo Lions Ltd | Arts & recreation | 2023 |
| London Taekwondo Warriors | Arts & recreation | 2007 |
| London Wala Ishq Movie Ltd | Information & communication | 2015 |
| London Waste Collection Limited | Water & waste | 2014 |
| London Waste Grab Limited | Transport & logistics | 2013 |
| London Wide Ltd | Real estate | 2010 |
| London Woodart Joinery Ltd | Construction | 2008 |
| Long ELM Supermarket Ltd | Wholesale & retail | 2018 |
| Long Vision Ltd | Professional & scientific | 2018 |
| Longboard Furniture Ltd | Construction | 2010 |
| Longfield Coating and Engineering Products Limited | Manufacturing | 1978 |
| Lopod Bay Limited | Information & communication | 2025 |
| Lorenzo Roma Limited | Hospitality | 1973 |
| LOT POT Group Limited | Real estate | 2023 |
| Lotus CCS Ltd | Professional & scientific | 2006 |
| Lotus Housing Management Ltd | Real estate | 2020 |
| Lotus Services (UK) Ltd | Professional & scientific | 2012 |
| Love for Sleep Ltd | Wholesale & retail | 2016 |
| Loving Lotus Limited | Professional & scientific | 2023 |
| Lovion Ltd | Real estate | 2021 |
| Loyal WIG Limited | Manufacturing | 2025 |
| LSD Design & Build Ltd | Construction | 2019 |
| LTW002 Ltd | Arts & recreation | 2023 |
| Lublush Ltd | Wholesale & retail | 2025 |
| Luca Team Limited | Construction | 2010 |
| Lucas Building Services Limited | Construction | 2010 |
| LUCAS-SECURITYK9 Ltd | Administrative & support | 2026 |
| Luck Food and Wine Store Ltd | Wholesale & retail | 2025 |
| Lukaniu Ltd | Transport & logistics | 2025 |
| Lukas Service Ltd | Wholesale & retail | 2016 |
| Luks Team Limited | Construction | 2016 |
| Lukshana Ltd | Real estate | 2024 |
| Lumevia Global Limited | Hospitality | 2025 |
| Lumiere 88 Aesthetics Ltd | Other services | 2025 |
| Lumivertex BPO Ltd | Information & communication | 2026 |
| Luna Storage Limited | Real estate | 2025 |
| Luthorprop Ltd | Real estate | 2019 |
| Luxihan Limited | Wholesale & retail | 2020 |
| Luxmy Properties Investment Ltd | Real estate | 2024 |
| Luxural Limited | Wholesale & retail | 2004 |
| Luxury Car Services Limited | Wholesale & retail | 2021 |
| Luxury Chauffeuring Ltd | Transport & logistics | 2023 |
| Luxury Chauffeurs London Ltd | Transport & logistics | 2018 |
| Luxury Hospitality London Ltd | Hospitality | 2024 |
| Luxury Trip Chauffeur Ltd | Transport & logistics | 2024 |
| LV Global Pharma Limited | Wholesale & retail | 2019 |
| LVG Exports Limited | Wholesale & retail | 2025 |
| LXD UK Ltd | Manufacturing | 2021 |
| Lybl (London) Limited | Wholesale & retail | 2025 |
| Lyfstyle Ltd | Wholesale & retail | 2020 |
| Lyons Trading Limited | Construction | 2017 |
| Lyric Studios Residents Company Limited | Households | 2006 |
| M & D Independent Consultancy Services Limited | Health & social care | 2022 |
| M & K Construction & Building Services Ltd | Construction | 2025 |
| M & P Investment Ltd | Real estate | 2017 |
| M F Pro Ltd | Financial services | 2024 |
| M I Drylining Ltd | Construction | 2022 |
| M Power Drylining Ltd | Construction | 2026 |
| M Unique Laser Clinic Ltd | Health & social care | 2021 |
| M&Ah Construction Ltd | Construction | 2023 |
| M&D Flooring and Carpentry Ltd | Manufacturing | 2025 |
| M&D Halal Meat Limited | Wholesale & retail | 2020 |
| M&H Real State Ltd | Construction | 2024 |
| M&M (UK) Ltd | Financial services | 2013 |
| M&M Constructiondeco Ltd | Construction | 2026 |
| M&M Decorating Ltd | Construction | 2021 |
| M&M Dynamic Wellness Ltd | Other services | 2025 |
| M&S Car Solutions Limited | Wholesale & retail | 2017 |