| Loanpad Holdings Limited | Financial services | 2017 |
| Loanpad Interest Cover Limited | Administrative & support | 2018 |
| Loanpad Limited | Financial services | 2015 |
| Loanpad Security Trustee Limited | Financial services | 2018 |
| LOC8TOR Limited | Manufacturing | 2004 |
| Lodgestar Limited | Real estate | 1992 |
| Lombas Properties Limited | Administrative & support | 2009 |
| London Bear Investments Limited | Real estate | 2015 |
| London Export Corporation Limited | Professional & scientific | 2014 |
| Lowlands and Partners Ltd | Professional & scientific | 2022 |
| Luck of the Bamboo Limited | Hospitality | 2024 |
| Lucky Lucky WU Limited | Hospitality | 2023 |
| Lupin Systems Limited | Information & communication | 2010 |
| Lusi Healthcare Limited | Health & social care | 2015 |
| M40 Concrete Limited | Manufacturing | 2017 |
| Magic WOK Hastings Limited | Hospitality | 2024 |
| Magical Magical WOK Limited | Hospitality | 2023 |
| Magwich UK Limited | Real estate | 2024 |
| Maison J Morais Limited | Professional & scientific | 2025 |
| Mange on the Move Limited | Hospitality | 1999 |
| Many Happy Days Limited | Hospitality | 2023 |
| MAQ Logistic Service Ltd | Transport & logistics | 2025 |
| Mare Pond Properties Limited | Real estate | 2017 |
| Marlyn Estates Ltd | Real estate | 2012 |
| Marspir Limited | Construction | 1945 |
| Masterkey Access Limited | Professional & scientific | 2015 |
| MBT Advisory Limited | Arts & recreation | 2025 |
| Meanwhile ... Music Limited | Arts & recreation | 1995 |
| Meanwhile ... Records Limited | Extraterritorial | 1995 |
| Medcalf Road Limited | Real estate | 2013 |
| Media Accountants Limited | Financial services | 2008 |
| Medical Imaging Solutions Limited | Financial services | 2023 |
| Medina Capital Investments (Partnership) Limited | Real estate | 2012 |
| Medina Capital Investments (Rentals) Limited | Real estate | 2015 |
| Medina Capital Investments Limited | Real estate | 2010 |
| Medsan UK Ltd | Wholesale & retail | 2020 |
| MEI Jing Limited | Hospitality | 2022 |
| MEN DO Talk Ltd | Health & social care | 2023 |
| Menachem 5781 Ltd | Wholesale & retail | 2021 |
| Menachem Glatt Kosher Limited | Manufacturing | 1996 |
| Mezzanine Flooring (UK) Limited | Construction | 2019 |
| MFK Property Limited | Construction | 2017 |
| Mg.Ag.Construct Ltd | Construction | 2014 |
| Microports.Net Limited | Administrative & support | 1999 |
| Ming's Clinic Limited | Health & social care | 2025 |
| MIO Coffee Limited | Wholesale & retail | 2020 |
| MIS Healthcare Limited | Professional & scientific | 2023 |
| Mitmas Developments Limited | Construction | 2014 |
| Mlro Services Limited | Other services | 2012 |
| MML Trading & Co Ltd | Real estate | 2011 |
| Moma Marketing Limited | Professional & scientific | 2024 |
| Monoceros 11 Limited | Professional & scientific | 2021 |
| Montarosa Limited | Administrative & support | 2015 |
| More Please Limited | Hospitality | 2009 |
| Mosa Halal Meat Ltd | Wholesale & retail | 2024 |
| Moscot London Limited | Wholesale & retail | 2015 |
| Mu&G Ltd | Wholesale & retail | 2019 |
| Mysoft Limited | Information & communication | 2004 |
| NA Segev Holdings Limited | Other services | 2025 |
| Nadine Aysoy Design Limited | Manufacturing | 2015 |
| Nannic UK Limited | Wholesale & retail | 2015 |
| Natural Roofing Slate Ltd | Extraterritorial | 2021 |
| Ndali Limited | Administrative & support | 2006 |
| Nemyb Limited | Other services | 2022 |
| Neutral Current Ltd | Professional & scientific | 2022 |
| New Alley Limited | Hospitality | 2022 |
| New China Inn Broadstairs Limited | Hospitality | 2023 |
| New Element Media Group Ltd | Real estate | 2021 |
| New HO WAN Limited | Hospitality | 2021 |
| New Jade East Ltd | Hospitality | 2022 |
| Nicolas Mask Limited | Construction | 2018 |
| Nigel Sloam & Co Limited | Other services | 2017 |
| Nineham Properties Limited | Real estate | 2017 |
| NK Investment Holdings Limited | Financial services | 2015 |
| Nosible Ltd | Information & communication | 2021 |
| Novasbooks Limited | Information & communication | 2001 |
| NS Productions Limited | Information & communication | 2014 |
| NSS (Sipp) Limited | Extraterritorial | 2005 |
| NSS Family Planning Limited | Other services | 2017 |
| NSS Financial Planning Limited | Other services | 2017 |
| NSS Financial Strategies Limited | Other services | 2017 |
| NSS Independent Trustees Limited | Extraterritorial | 2001 |
| NSS International Financial Planning Limited | Other services | 2017 |
| NSS Investment Consultants Limited | Other services | 2017 |
| NSS Trustee Services Limited | Administrative & support | 2021 |
| NSS Trustees Limited | Administrative & support | 2001 |
| NSS Trusts Limited | Administrative & support | 2022 |
| NSS Wealth Planning Limited | Other services | 2017 |
| NYA GGR Holdings Limited | Other services | 2025 |
| Obbard Limited | Construction | 1994 |
| Odelia's Kitchen Limited | Hospitality | 2022 |
| OG Bromley Limited | Hospitality | 2024 |
| Old House Clinic Limited | Real estate | 2020 |
| Old Kent Pizza Ltd | Hospitality | 2025 |
| OM Chisou Limited | Hospitality | 2023 |
| One Retail Group Limited | Wholesale & retail | 2013 |
| Openeast Ltd | Wholesale & retail | 2009 |
| Opexai Ltd | Wholesale & retail | 2024 |
| Opus Vantage Consulting (UK) Limited | Professional & scientific | 2014 |
| Own London Ltd | Wholesale & retail | 2016 |