| MON Reverie Limited | Wholesale & retail | 2025 |
| MOO Consulting Ltd | Professional & scientific | 2024 |
| Moran Tea Company,Limited | Transport & logistics | 1893 |
| Moratemms Health Solution Ltd | Health & social care | 2022 |
| Morgain Consultancy Ltd | Information & communication | 2019 |
| Mount Moriah Limited | Real estate | 2022 |
| MP7 Training Limited | Arts & recreation | 2017 |
| Mrbakermrscook Limited | Hospitality | 2023 |
| Mrichardsservices Ltd | Construction | 2025 |
| MTF Bespoke Builders Works Ltd | Construction | 2019 |
| MTF Fire Protection Ltd | Construction | 2019 |
| MTF Steel Fabrication Ltd | Construction | 2019 |
| MUM & ME Events Ltd | Hospitality | 2026 |
| Mvtac Ltd | Professional & scientific | 2023 |
| My Posh Lingerie Limited | Wholesale & retail | 2018 |
| Mykedyke Services Ltd. | Wholesale & retail | 2017 |
| Mysaga Homes Ltd | Real estate | 2023 |
| MZ Global (UK) Ltd | Wholesale & retail | 2011 |
| N & K Development Limited | Real estate | 2025 |
| Nashgid Associates Limited | Professional & scientific | 1999 |
| Natalie K Limited | Wholesale & retail | 2023 |
| Nathan Timothy Foundation Ltd | Education | 2011 |
| Nathan Timothy Music Limited | Information & communication | 2025 |
| Naturenest Care Limited | Administrative & support | 2025 |
| Neatly and Quickly Limited | Administrative & support | 2019 |
| New Lighthouse Limited | Professional & scientific | 2011 |
| Newgen AI Ltd | Information & communication | 2024 |
| Nexgen Office Solutions Ltd | Wholesale & retail | 2013 |
| Nexorizon Marketing Ltd | Professional & scientific | 2025 |
| Niche BDS Ltd | Information & communication | 2020 |
| Nicolae Uritescu Ltd | Transport & logistics | 2012 |
| Nieciag Estates Ltd | Real estate | 2026 |
| Nipit Consultancy Ltd | Professional & scientific | 2016 |
| Nittygritty Solutions Ltd | Financial services | 2008 |
| Noorh Services Limited | Water & waste | 2025 |
| Northfleet Spray and Body Centre Limited | Construction | 1983 |
| NRA BTL Property Limited | Real estate | 2023 |
| NVP Diagnostics UK Ltd | Education | 2014 |
| NW Creations Ltd | Professional & scientific | 2019 |
| NW Pharma Limited | Wholesale & retail | 2023 |
| Oakks Consulting Limited | Information & communication | 2010 |
| Ogisp Limited | Professional & scientific | 2018 |
| Oliver Franklin Bespoke Cleaning Services Ltd | Administrative & support | 2019 |
| Omega Care & Training Ltd | Health & social care | 2021 |
| ON OPS Consulting Limited | Professional & scientific | 2025 |
| Onecloset Limited | Information & communication | 2025 |
| Oneness Enterprises Ltd | Real estate | 2019 |
| Onubogu and Afilaka Limited | Health & social care | 2015 |
| OPN Network Limited | Wholesale & retail | 2025 |
| Optima Build Ltd | Construction | 2024 |
| Optimal Learning Centre Limited | Education | 2019 |
| Optionone Services UK Ltd | Health & social care | 2013 |
| Opulent Furniture Limited | Wholesale & retail | 2024 |
| Orinstay Ltd | Real estate | 2026 |
| Ortho Locum Doctor Limited | Real estate | 2011 |
| Osprey BPM Limited | Information & communication | 2025 |
| OUR Mental Health Matters Ltd. | Education | 2020 |
| Ovaluk Ltd | Professional & scientific | 2024 |
| P & C Solution Ltd | Construction | 2022 |
| Palmer Rail Engineering Ltd | Professional & scientific | 2025 |
| Paramor Capital Ltd | Real estate | 2023 |
| Pastures House Ltd | Hospitality | 2024 |
| Pathway to Salesforce Limited | Information & communication | 2025 |
| PEN - N - a - PAD Company Limited | Administrative & support | 2003 |
| Perfect Fit Labs Ltd | Manufacturing | 2023 |
| Perfect Pitch Carpentry Ltd | Construction | 2018 |
| Permacard Limited | Arts & recreation | 1988 |
| PES Associates Ltd | Professional & scientific | 2026 |
| PH84 Ltd | Professional & scientific | 2022 |
| Phoenix Steigend Solutions Ltd | Information & communication | 2023 |
| Phurn Incorporations Limited | Administrative & support | 2012 |
| Pike Club Ltd | Arts & recreation | 2026 |
| Pinnacle Services (Kent) Ltd | Administrative & support | 2019 |
| Pispo Ltd | Wholesale & retail | 2012 |
| Piticu One Ltd | Construction | 2022 |
| Pixelmuch Ltd | Professional & scientific | 2013 |
| PJ IT Solutions Limited | Information & communication | 2019 |
| Placement Bridges UK Limited | Health & social care | 2025 |
| Plan Systems Limited | Administrative & support | 2008 |
| Plant & Material Supplies Limited | Wholesale & retail | 2018 |
| Plousios Gigantas Ltd | Information & communication | 2024 |
| Pocketbot Ltd | Information & communication | 2024 |
| Point One Associates Limited | Professional & scientific | 2018 |
| POINT2POINT Express Limited | Transport & logistics | 2014 |
| Popa Fixers Ltd | Construction | 2014 |
| Portmill Auto Engineers Limited | Wholesale & retail | 2007 |
| Poshville UK Ltd | Wholesale & retail | 2021 |
| Positive Steel Ltd. | Construction | 2017 |
| Prdhomes Ltd | Real estate | 2019 |
| Pretend Paper Co Ltd | Wholesale & retail | 2026 |
| Prevail Group International Limited | Real estate | 2025 |
| Primekey Capital Ltd | Real estate | 2026 |
| Pristine Plumbing and Bathrooms Ltd | Construction | 2025 |
| Product Pond Ltd | Wholesale & retail | 2020 |
| Production Sound Engineering Limited | Information & communication | 2020 |
| Project Made Easy Limited | Construction | 2022 |
| Proper Property Rebuilds Ltd | Construction | 2025 |
| Property Management Ventures Limited | Real estate | 2025 |
| Pura ES Group Ltd | Professional & scientific | 2025 |
| Pura ES Ltd | Energy | 2024 |