| Lungisa Limited | Administrative & support | 2026 |
| Luven Labs Limited | Information & communication | 2025 |
| Lyla Maria Jewellery Ltd | Wholesale & retail | 2023 |
| M L J Consultancy Services Ltd | Professional & scientific | 2023 |
| Maba Financial Services Ltd | Financial services | 2007 |
| Made With US Collective Limited | Professional & scientific | 2013 |
| Magic Cleaners Team Ltd | Administrative & support | 2015 |
| Maison Meline Ltd | Wholesale & retail | 2021 |
| Maison MMC Ltd | Agriculture & fishing | 2025 |
| Manchu Ltd | Real estate | 2024 |
| Mannat Investments Limited | Real estate | 2024 |
| Mapmaker Travel Limited | Administrative & support | 2022 |
| Marcus Aurelius Capital. Ltd | Information & communication | 2026 |
| Margam Green Energy Opco Limited | Energy | 2025 |
| Marketplace Lending Investments Ltd | Financial services | 2015 |
| Marleyspoon Limited | Administrative & support | 2014 |
| Marsop Assets Ltd | Financial services | 2020 |
| Marvas Holdings Ltd | Real estate | 2024 |
| Masakali Limited | Real estate | 2017 |
| Matetideresin Ltd | Wholesale & retail | 2026 |
| Maven UK Regional Buyout II GP LLP | | 2024 |
| Mavia Consulting Limited | Professional & scientific | 2016 |
| Mcgovern - Helix Management Co. Limited | Extraterritorial | 2002 |
| Mcjad Consulting Ltd | Information & communication | 2023 |
| MDV Ventures MGT Limited | Professional & scientific | 2025 |
| Meetyourchoice Limited | Wholesale & retail | 2026 |
| Mercie Studios Limited | Wholesale & retail | 2026 |
| Metro PAT Ltd | Construction | 2016 |
| MGR Asset Management Limited | Real estate | 2022 |
| Microchip Technology Limited | Information & communication | 1997 |
| Micronovo Ltd | Wholesale & retail | 2024 |
| Midascg Ltd | Financial services | 2025 |
| Mignon Group Ltd | Real estate | 2022 |
| Mill Road Pharmacy Limited | Wholesale & retail | 2009 |
| Millson Industries Ltd | Information & communication | 2022 |
| Mirabeau BSR Ltd | Administrative & support | 2013 |
| Mirasec Ltd | Information & communication | 2023 |
| Moonrat Industries Limited | Manufacturing | 2020 |
| Moron Services Limited | Administrative & support | 2012 |
| Mowria Ltd | Administrative & support | 2024 |
| MS Programming Limited | Information & communication | 2019 |
| Muslims in Public Policy C.I.C. | Other services | 2022 |
| My Waffl Ltd. | Information & communication | 2015 |
| NAL Investments Limited | Financial services | 2021 |
| Namaste Wembley Ltd | Hospitality | 2025 |
| Nane’S Seasoning Ltd | Manufacturing | 2024 |
| Nanka Removals Limited | Transport & logistics | 2008 |
| Ndynamix Limited | Real estate | 2023 |
| Neckbreakers Limited | Arts & recreation | 2024 |
| Negan & Lucille Ltd | Information & communication | 2025 |
| New Trade Mercury Limited | Extraterritorial | 2010 |
| Nexa First Ltd | Information & communication | 2025 |
| Nexbridge Global Ltd | Administrative & support | 2026 |
| NI Co Patties Ltd | Hospitality | 2020 |
| Niki Isherwood Interiors Ltd | Professional & scientific | 2025 |
| Noble Aeronautica Limited | Transport & logistics | 2020 |
| Noreen Farooq Ltd | Wholesale & retail | 2025 |
| Norton Lodge Freehold Limited | Households | 2026 |
| NR2 Ventures LLP | | 2021 |
| Nukhb Ltd | Information & communication | 2025 |
| Number One Lansdowne Gardens Limited | Real estate | 2006 |
| Nutri-San Limited | Manufacturing | 2021 |
| Odyssey Business Ltd | Professional & scientific | 2005 |
| Olaola Design Ltd | Wholesale & retail | 2021 |
| Old FIR Advisors Limited | Professional & scientific | 2018 |
| Ollequip Trading Ltd | Wholesale & retail | 2005 |
| One Eyed Films Limited | Information & communication | 2003 |
| ONE2ONE Car Services Ltd | Transport & logistics | 2021 |
| Onetab Ltd | Information & communication | 2007 |
| Onezone Services Limited | Professional & scientific | 2004 |
| Open Exchange Rates (UK) Limited | Information & communication | 2016 |
| Order Studio Limited | Information & communication | 2021 |
| Organic Village Limited | Wholesale & retail | 2007 |
| Orítóké Ltd | Health & social care | 2020 |
| Osme Education Ltd | Professional & scientific | 2021 |
| Oyewumi Limited | Construction | 2021 |
| P Shah Property Limited | Real estate | 2023 |
| P.S. Joinery Fit OUT Ltd | Construction | 2017 |
| Pacific Cuisine Limited | Hospitality | 2023 |
| PAD Creative Limited | Professional & scientific | 2007 |
| Palm Tree Island Limited | Information & communication | 2021 |
| Panorama Testbase Limited | Professional & scientific | 1993 |
| Panormos Limited | Construction | 2017 |
| Paramhansa Limited | Real estate | 2023 |
| Parkmoor Consulting Limited | Information & communication | 2012 |
| Partnership for Young London | Professional & scientific | 1997 |
| Pegasus UK Bidco Limited | Financial services | 2026 |
| Penguin Habitats Ltd | Real estate | 2006 |
| Pensiero Ltd | Information & communication | 2020 |
| PER Aspera Animamus Ltd | Wholesale & retail | 2026 |
| Perspective Post Production Ltd | Information & communication | 2017 |
| Philip J Collins Limited | Manufacturing | 2008 |
| PHK a Ltd | Wholesale & retail | 2025 |
| Phoenix Capital Group Ltd | Administrative & support | 2023 |
| Pillar Education Ltd | Education | 2026 |
| Pillar Finance Management Ltd | Financial services | 2026 |
| Pinksalt Partners Accura Ltd | Professional & scientific | 2023 |
| Pinner Tyres & Alignment Centre Ltd | Wholesale & retail | 2025 |
| Playsmart Solutions (London) Limited | Information & communication | 2020 |
| PLW Properties Ltd | Real estate | 2017 |