| Kobsecurity Ltd | Administrative & support | 2021 |
| Korah Security Services Ltd | Administrative & support | 2024 |
| Kosarmart Ltd | Wholesale & retail | 2025 |
| Kstudios Property Services Ltd | Construction | 2021 |
| L & D Bridge Limited | Manufacturing | 2013 |
| L M Barry & Co Limited | Wholesale & retail | 1991 |
| L.R.C. Management Consultancy Limited | Professional & scientific | 1991 |
| Labubu Lover Ltd | Wholesale & retail | 2025 |
| Lake Storm Limited | Wholesale & retail | 2023 |
| Larry K1NG Empire Ltd | Construction | 2023 |
| Launch Apps Ltd | Information & communication | 2025 |
| Launchstack Ltd | Wholesale & retail | 2025 |
| Laura Wholesaler Limited | Wholesale & retail | 2026 |
| Lawrence a Dunham Limited | Administrative & support | 2025 |
| Layerverse Ltd | Information & communication | 2021 |
| Ldvant Limited | Administrative & support | 2025 |
| Lehrtrading Limited | Wholesale & retail | 2026 |
| Levemun Holding Ltd | Financial services | 2026 |
| Levemun Ltd | Information & communication | 2026 |
| Levemun Operations Ltd | Agriculture & fishing | 2020 |
| Leven Talent Ltd | Professional & scientific | 2023 |
| Lienealdesign Limited | Wholesale & retail | 2022 |
| Light Energy Partners Ltd | Professional & scientific | 2022 |
| Little Roots Childcare Ltd | Health & social care | 2026 |
| Livery Consulting Ltd | Professional & scientific | 2023 |
| Ljrm Investment Management Limited | Extraterritorial | 2011 |
| London Decarbonisation (UK) Limited | Construction | 2021 |
| London Facilities & Management Ltd | Real estate | 2025 |
| London Ocean Law Ltd | Public administration | 2021 |
| London Ocean Times Ltd | Information & communication | 2021 |
| London Ocean Venture Ltd | Financial services | 2021 |
| London Prestige Services Ltd | Wholesale & retail | 2021 |
| London Recovery Services Ltd | Wholesale & retail | 2023 |
| Lonergan & Co Limited | Construction | 2010 |
| Love Literacy Limited | Education | 2019 |
| LR Foods Limited | Wholesale & retail | 2024 |
| Lucid 8 Ltd | Information & communication | 2025 |
| Lumero Ltd | Wholesale & retail | 2025 |
| Luminosa Skincare Ltd | Other services | 2024 |
| Luna Outlet Ltd | Wholesale & retail | 2025 |
| Lwjr Properties Limited | Real estate | 2026 |
| M Equestrian Services Ltd | Arts & recreation | 2015 |
| M Squared Security Ltd | Financial services | 2023 |
| Maci Property Services Ltd | Construction | 2025 |
| Made Cosmetics Ltd | Wholesale & retail | 2024 |
| Made IT Real Ltd | Other services | 2026 |
| Maek Eyewear Ltd | Manufacturing | 2024 |
| Mahser Limited | Real estate | 2022 |
| Maklex Ltd | Administrative & support | 2020 |
| Mansora Limited | Wholesale & retail | 2010 |
| Marching Monads Ltd | Information & communication | 2026 |
| Marmaris Piri Piri Limited | Hospitality | 2019 |
| Marvel Engineering Services Ltd | Professional & scientific | 2016 |
| Mathar Saeed & Co. Ltd | Administrative & support | 2016 |
| Maties Build Ltd | Construction | 2026 |
| MC Bacon Management Limited | Professional & scientific | 2010 |
| Mercury Eight London Ltd | Professional & scientific | 2022 |
| Merlin Press Limited(The) | Information & communication | 1957 |
| Metanoia Creative Limited | Professional & scientific | 2023 |
| Metaverse Properties Ltd | Real estate | 2021 |
| Metro Cleaning Supplies Limited | Extraterritorial | 2012 |
| Miah LDN Limited | Manufacturing | 2020 |
| Microtechglobaluk Ltd. | Wholesale & retail | 2017 |
| Microtimesgroup Ltd | Professional & scientific | 2023 |
| Millions Group of Companies Ltd | Hospitality | 2022 |
| Mindmotion CIC | Education | 2025 |
| Mishal Enterprises Ltd | Wholesale & retail | 2020 |
| MJ Trading World Ltd | Wholesale & retail | 2021 |
| Mktm Limited | Professional & scientific | 2015 |
| ML Property Venture Limited | Construction | 2019 |
| MNJ Management Limited | Professional & scientific | 2010 |
| MNJ Publishing Limited | Information & communication | 2014 |
| Mobizone Tech Limited | Wholesale & retail | 2025 |
| Modgen Ltd | Wholesale & retail | 2022 |
| Mohsin Irshad Limited | Wholesale & retail | 2025 |
| Moonatora Ltd | Wholesale & retail | 2026 |
| Motionstep Chiropody and Podiatry Clinic Ltd | Health & social care | 2026 |
| Motor Reliance Ltd | Wholesale & retail | 2021 |
| MSD Trading Ltd | Wholesale & retail | 2024 |
| MSM Northern Limited | Wholesale & retail | 2025 |
| Muse Pathways Ltd | Education | 2026 |
| Musukebba Logistics Ltd | Transport & logistics | 2020 |
| Nabcon Construction Ltd | Construction | 2025 |
| Najm Store Ltd | Wholesale & retail | 2025 |
| Naps TV Limited | Information & communication | 2020 |
| Nara Kitchen Ltd | Hospitality | 2020 |
| Nartkwaku Botchway Limited | Wholesale & retail | 2024 |
| Natures Abundance Limited | Wholesale & retail | 2025 |
| NATWAY2HEALTH Limited | Health & social care | 2025 |
| NAV GP Ltd | Health & social care | 2025 |
| Ndneko Ltd | Wholesale & retail | 2025 |
| Necktle Ltd | Wholesale & retail | 2026 |
| Nector U.K. Limited | Real estate | 1995 |
| Nelc UK Limited | Health & social care | 2020 |
| Nera Care Limited | Administrative & support | 2021 |
| Netmode Technologies Ltd | Information & communication | 2025 |
| New Life Studios Ltd | Information & communication | 2025 |
| Nexora Cart Ltd | Wholesale & retail | 2026 |
| Nextgem Ltd | Wholesale & retail | 2024 |
| Nextgen Accountants Limited | Professional & scientific | 2011 |