| Lauren Elizabeth Events Limited | Professional & scientific | 2022 |
| LDD Care Ltd | Administrative & support | 2026 |
| LE Derma Limited | Health & social care | 2022 |
| LEE Ingram Estates Ltd | Real estate | 2022 |
| Legalmatters Firm Ltd | Other services | 2022 |
| Leoyoki Lawrence Limited | Extraterritorial | 2022 |
| Lesien London Ltd | Manufacturing | 2021 |
| LI Grace Rentals Ltd | Real estate | 2023 |
| Li'L Champs Ltd | Education | 2023 |
| License to Skill Limited | Education | 2011 |
| Linchpin Property Ltd | Professional & scientific | 2025 |
| Lindsay Owens Coaching Ltd | Professional & scientific | 2025 |
| Little Printers Limited | Wholesale & retail | 2023 |
| Littlemustard Ltd | Education | 2025 |
| Livingstone-Mbe Properties UK Ltd | Real estate | 2020 |
| Liviya Ltd | Real estate | 2025 |
| Lmgc Holdings Ltd | Administrative & support | 2023 |
| Lmhire Limited | Transport & logistics | 2023 |
| London-Kiev Ltd | Transport & logistics | 2019 |
| LS Housings Ltd | Real estate | 2020 |
| Lsbc Holdings Ltd | Real estate | 2025 |
| Lsbc Investments Ltd | Real estate | 2018 |
| Lupu Trans Ltd | Transport & logistics | 2014 |
| Luttman Scaffolding Ltd | Construction | 2025 |
| Luxury Pamper Booking UK Ltd | Other services | 2025 |
| Lyon Designs Limited | Other services | 2017 |
| M C Marble Ltd | Manufacturing | 2012 |
| M J D Group Limited | Transport & logistics | 2004 |
| M Keys Auto Ltd | Wholesale & retail | 2016 |
| M&H Finance Limited | Wholesale & retail | 2024 |
| M&M Accounting Services Ltd | Professional & scientific | 2011 |
| M&M Patel Properties Ltd | Construction | 2026 |
| M&T Property Services Ltd | Real estate | 2026 |
| M. Thompson Plumbing & Heating Ltd | Construction | 2020 |
| Maanavaani Limited | Financial services | 2023 |
| Macg Properties Ltd | Professional & scientific | 2024 |
| Machinetech Industries UK Ltd | Wholesale & retail | 2025 |
| Mad.B Studios Ltd | Information & communication | 2023 |
| MADAS1 Ltd | Health & social care | 2016 |
| Magavie Health Ltd | Health & social care | 2024 |
| Mahalia Joy Skin and Aesthetic Clinic Limited | Health & social care | 2026 |
| Makaay Consulting Ltd | Information & communication | 2017 |
| Makh Aghun Consulting Ltd | Extraterritorial | 2018 |
| Makh Consulting Limited | Other services | 2018 |
| Marian’S POT Limited | Hospitality | 2025 |
| Maritime Academy Trust | Education | 2016 |
| Maritime Children's Foundation | Other services | 2024 |
| Marron Consultancy Limited | Administrative & support | 2014 |
| Marryjuana Limited | Health & social care | 2018 |
| Marynola Ltd | Transport & logistics | 2020 |
| Mascot Solutions Limited | Information & communication | 2022 |
| Masorie Company Ltd | Health & social care | 2021 |
| Matti Group Services Limited | Construction | 2023 |
| MAU Limited | Wholesale & retail | 2024 |
| Mauka Limited | Administrative & support | 2016 |
| Maîtresse-En-Titre Ltd | Administrative & support | 2025 |
| MB Mechanical Ltd | Construction | 2023 |
| MDA Decorators and Refurbishment Ltd | Construction | 2025 |
| MDI Construction Ltd | Construction | 2026 |
| Meketz Trans Ltd | Transport & logistics | 2023 |
| Mental Soundness Match Limited | Information & communication | 2021 |
| Metacampus Tech Ltd. | Information & communication | 2022 |
| Metis Tutoring and Language Services Limited | Professional & scientific | 2021 |
| Metro's Ashja Ltd | Hospitality | 2024 |
| Midtown Logistics Limited | Transport & logistics | 2011 |
| Midz Motors Ltd | Wholesale & retail | 2022 |
| Miez Limited | Manufacturing | 2024 |
| Mijay Trading Limited | Wholesale & retail | 2020 |
| Milton HD Limited | Professional & scientific | 2005 |
| Misssp Ltd | Administrative & support | 2023 |
| MJ Installations Limited | Wholesale & retail | 2010 |
| MJD Containers Limited | Transport & logistics | 2007 |
| MJD Distribution Limited | Transport & logistics | 2009 |
| MJD Logistics (UK) Limited | Transport & logistics | 2007 |
| MJD Services (UK) Limited | Transport & logistics | 2007 |
| MJD Warehousing Limited | Wholesale & retail | 2008 |
| Mmy&Ady Ltd | Transport & logistics | 2021 |
| Mo-Luxury Properties Ltd | Real estate | 2023 |
| Mobius Recycling Group Limited | Other services | 2002 |
| Moirai Ltd | Information & communication | 2024 |
| Monarch Auto Repairs Limited | Wholesale & retail | 2013 |
| Monitor Technologies Ltd | Information & communication | 2024 |
| Mother of Perpetual Help Limited | Health & social care | 2026 |
| Moto & CIA Ltd | Wholesale & retail | 2026 |
| Movart Services Ltd | Professional & scientific | 2016 |
| Mrkt-Ready Ltd | Construction | 2019 |
| MS5 Resource Limited | Information & communication | 2025 |
| MSA Marketing Limited | Professional & scientific | 2020 |
| Msvs (Kent) Ltd | Hospitality | 2023 |
| MTE Decor Ltd | Construction | 2026 |
| My Family Organisation | Health & social care | 2017 |
| My Medicalbilling Company Ltd | Administrative & support | 2020 |
| Nahem Limited | Public administration | 2022 |
| Nasu Trans Ltd | Transport & logistics | 2014 |
| Neelkanth Holding Limited | Financial services | 2020 |
| Nematov Ltd | Transport & logistics | 2019 |
| Nero Bespoke Ltd | Wholesale & retail | 2025 |
| Netcanvas Ltd | Wholesale & retail | 2025 |
| Newmakes Inc Ltd | Administrative & support | 2025 |
| Newoil Consultants Limited | Extraterritorial | 2014 |