| Lokalnest Ltd | Wholesale & retail | 2025 |
| Lola More Limited | Households | 2019 |
| London City Properties & Investments Ltd | Real estate | 2016 |
| London Consultancy and Management Ltd | Real estate | 2018 |
| London Drive Ltd | Transport & logistics | 2025 |
| London Hawk Limited | Wholesale & retail | 2025 |
| London Housing Associates Ltd | Hospitality | 2018 |
| London Jersey Gallery CIC | Wholesale & retail | 2026 |
| London Mart Express Limited | Wholesale & retail | 2025 |
| London Online Trader Limited | Wholesale & retail | 2021 |
| London Prestige Chauffeur Ltd | Transport & logistics | 2025 |
| London Quality DRY Cleaners Ltd | Other services | 2024 |
| London Suites Ltd | Hospitality | 2015 |
| London X Living Clothing Ltd | Wholesale & retail | 2018 |
| Londontech IT Ltd | Information & communication | 2023 |
| Londonwide Windows & Maintenance Limited | Construction | 2024 |
| Lordden Consulting Services Limited | Information & communication | 2012 |
| Loriat UK Ltd | Real estate | 2025 |
| Lornsin Perfect Healthcare Ltd | Public administration | 2018 |
| Lorraine Paruma Ltd | Health & social care | 2013 |
| Lorrimar Consultancy Limited | Health & social care | 2014 |
| Lotus Catalyst Counselling Ltd | Administrative & support | 2023 |
| Lotus Specialist Enterprises Limited | Health & social care | 2022 |
| Louisteaching Ltd | Education | 2025 |
| Loumaster Ltd | Real estate | 2025 |
| Lovedagrace Ltd | Health & social care | 2023 |
| Lovelikestace Holistic Ltd | Health & social care | 2023 |
| Loving Hands International Nursery School Limited | Education | 2009 |
| Loving Hands Training Academy Limited | Education | 2025 |
| Ltdc Holding Ltd | Real estate | 2021 |
| Lucerne House Limited | Health & social care | 2013 |
| Lucore Construction Limited | Construction | 2026 |
| Lueur LAB Limited | Wholesale & retail | 2025 |
| Lukmax Transport Ltd | Transport & logistics | 2019 |
| Lumina Law Chambers LLC Ltd | Professional & scientific | 2025 |
| Lumono Mwatshihengo Cleaning Limited | Administrative & support | 2026 |
| Lunarex 766 Ltd | Wholesale & retail | 2025 |
| Luxe & Paws UK Limited | Manufacturing | 2026 |
| Luxe Hide Ltd | Wholesale & retail | 2025 |
| Luxe Lodgings Limited | Hospitality | 2025 |
| Luxor Investments Limited | Real estate | 2013 |
| Luxury Colours Limited | Manufacturing | 2026 |
| Luxury Logistics UK Ltd | Administrative & support | 2020 |
| Lwcn Ltd | Construction | 2025 |
| Lyddy's Electrical Services Limited | Construction | 2010 |
| Lyfereel Limited | Health & social care | 2022 |
| M & a Corporation Ltd | Water & waste | 2022 |
| M & M Multi Ltd | Wholesale & retail | 2023 |
| M & S Star Limited | Wholesale & retail | 2020 |
| M Boyce GAS & Plumbing Limited | Construction | 2019 |
| M Business Services Ltd | Construction | 2026 |
| M D Motors London Ltd | Wholesale & retail | 2026 |
| M Patel MD Ltd | Health & social care | 2024 |
| M&C Cleaning Ltd | Administrative & support | 2024 |
| M&M Afro Caribbean Supermarket Ltd | Wholesale & retail | 2020 |
| M&M Concept Ltd | Information & communication | 2024 |
| M&Md Healthcare Limited | Health & social care | 2019 |
| M&P Construction Team Ltd | Construction | 2023 |
| M&P Electrician and Construction Ltd | Construction | 2024 |
| M&Q Supply Limited | Wholesale & retail | 2025 |
| M-Pet Sitting Services Limited | Other services | 2025 |
| M.A Constructions & Services Ltd | Construction | 2023 |
| M.B. Echo Build Ltd | Construction | 2022 |
| MA Building Construction Company Limited | Construction | 2026 |
| Ma&Bro Limited | Construction | 2026 |
| Maadev Property Limited | Real estate | 2021 |
| Maanams Ltd | Wholesale & retail | 2025 |
| Maargam IT Consultancy. Limited | Information & communication | 2017 |
| Maaz Consulting Services Limited | Information & communication | 2013 |
| MAC London Limited | Construction | 2020 |
| MAC Tutorials Ltd | Education | 2019 |
| Macanawears Ltd | Wholesale & retail | 2026 |
| MADE2CLEAN Ltd | Administrative & support | 2022 |
| Magnetic Aura Limited | Hospitality | 2025 |
| Magnusaa Ltd | Information & communication | 2022 |
| Mahalakshmi Food Ltd | Wholesale & retail | 2021 |
| Maidinaprons Cleaning Services Ltd | Households | 2021 |
| Main Street ( Peasmarsh) Ltd | Real estate | 2020 |
| Majida Tuition Provider Ltd | Education | 2014 |
| MAK Properties Ltd | Real estate | 2025 |
| Make a Milli Ltd | Wholesale & retail | 2024 |
| Making the Right Move Limited | Real estate | 2021 |
| Maknoz Ltd | Health & social care | 2025 |
| Malabaarica Ltd | Manufacturing | 2025 |
| Malcolm Place RTM Company Limited | Households | 2024 |
| Malde Properties Limited | Real estate | 2017 |
| Mallontech Ltd | Construction | 2018 |
| Mama Foods London Ltd | Hospitality | 2025 |
| MAMIN05 Limited | Wholesale & retail | 2022 |
| Manag Ltd | Transport & logistics | 2026 |
| Manbay (GB) Services CIC | Education | 2022 |
| Mandarino Ltd | Professional & scientific | 2025 |
| Mangatt R&K Ltd | Wholesale & retail | 2026 |
| Manifest Property Investors Ltd | Households | 2019 |
| Mansford Services Ltd | Administrative & support | 2025 |
| Mansha Enterprise Limited | Wholesale & retail | 2025 |
| Mansoura Consulting Ltd | Financial services | 2019 |
| Mar-Dan Tiling Ltd | Construction | 2012 |
| Marcel .B Export Ltd | Wholesale & retail | 2023 |
| Marcelo Alves Ribeiro Ltd | Wholesale & retail | 2025 |