| Middle Route Ltd | Other services | 2019 |
| Millie Turner Designs Ltd | Professional & scientific | 2021 |
| Minh Phuong UK Limited | Wholesale & retail | 2001 |
| Mint Build UK Limited | Construction | 2016 |
| Miramar Group Limited | Real estate | 2025 |
| Miramar Properties Limited | Real estate | 2016 |
| Mitner Limited | Other services | 2014 |
| MMG Building Services & Developments Limited | Construction | 2007 |
| MMG Building Services Limited | Construction | 2022 |
| MMG Construction Group Limited | Construction | 2018 |
| MMG White Rose Limited | Construction | 2022 |
| Mmusa Group Ltd | Wholesale & retail | 2026 |
| Moore Roofing Contractors Limited | Construction | 2020 |
| Moriiish Ltd | Wholesale & retail | 2025 |
| Mortgage Match Services Limited | Financial services | 2006 |
| Mortgages of London Limited | Extraterritorial | 2018 |
| Moxie Lettings Ltd | Real estate | 2025 |
| Mozart Concierge Limited | Other services | 2022 |
| MP Automotive London Limited | Wholesale & retail | 2023 |
| MPB Investments Limited | Real estate | 2014 |
| MPR Western Ltd | Professional & scientific | 2026 |
| Mykl Songs Ltd | Arts & recreation | 2016 |
| M’S Vault Ltd | Wholesale & retail | 2024 |
| Nani Investment Properties Limited | Real estate | 2018 |
| Nate Transport Limited | Transport & logistics | 2014 |
| Nemean Financial Services Limited | Financial services | 2020 |
| Network Resale Limited | Information & communication | 2024 |
| Newington (Sittingbourne) Ltd | Financial services | 2018 |
| Newington Plans Limited | Professional & scientific | 2019 |
| Nikss Ltd | Construction | 2021 |
| Nikusaaldi LLP | | 2021 |
| NM Electric Limited | Other services | 2014 |
| Noah's ARK Day Nursery Limited | Education | 2003 |
| North London Telecom Systems Limited | Information & communication | 2008 |
| NOT BIM Limited | Information & communication | 2022 |
| Novamier Limited | Information & communication | 2021 |
| Novastates Limited | Construction | 1984 |
| NRM Small Business Solutions Limited | Professional & scientific | 2018 |
| Oakhill IT Solutions LLP | | 2019 |
| Oakmere Investments Ltd | Real estate | 2019 |
| Omniscient Global Limited | Administrative & support | 2022 |
| Omonia Youth (UK) Limited | Arts & recreation | 2006 |
| ON the Rocks Jewellers Ltd | Wholesale & retail | 2025 |
| One Stop Language Solutions Limited | Professional & scientific | 2010 |
| Open Field Services Ltd | Other services | 2024 |
| Optimum Build & Maintain Ltd | Construction | 2025 |
| Orama Group Ltd. | Construction | 2020 |
| P. & R. Procurement Limited | Construction | 2022 |
| P. Ellis Catering Limited | Hospitality | 2021 |
| PAC Managements Ltd | Real estate | 2011 |
| Pace Hospitality Limited | Other services | 2016 |
| Panacaea Health Ltd | Health & social care | 2023 |
| Papacinos Limited | Hospitality | 2003 |
| Parkview Automobiles Limited | Wholesale & retail | 2015 |
| Parkview Investments Limited | Real estate | 2019 |
| PB Work Ltd | Professional & scientific | 2024 |
| Periandros Design Ltd | Professional & scientific | 2018 |
| Perso London Limited | Real estate | 2023 |
| Peter Anthony Properties Ltd | Real estate | 2003 |
| Petrify Consulting Limited | Financial services | 2010 |
| Pinewood Capital Ltd | Real estate | 2013 |
| Pinnacle Build UK Limited | Other services | 2018 |
| Pitnic Limited | Real estate | 2017 |
| Pizza Place Limited | Hospitality | 2003 |
| Plastic JAM Ltd | Other services | 2024 |
| Playing the Game Limited | Arts & recreation | 2010 |
| PMB78 Ltd | Administrative & support | 2021 |
| Poku Estate Ltd | Information & communication | 2019 |
| Polsfood.Uk Limited | Wholesale & retail | 2025 |
| Poseidon Fish Wholesale Limited | Wholesale & retail | 2018 |
| Positive Caring Communities Limited | Health & social care | 2022 |
| Potentia Navitas Limited | Information & communication | 2014 |
| Potts Point Trading Ltd | Wholesale & retail | 2025 |
| Power 4 Property Limited | Real estate | 2020 |
| PR Suite Limited | Real estate | 2021 |
| Premier Finance and Mortgages Ltd | Financial services | 2002 |
| Premier Letts Limited | Real estate | 2017 |
| Prestige AV Limited | Wholesale & retail | 2018 |
| Property Asset Care Ltd | Construction | 2006 |
| Property Fellas Building Services Limited | Other services | 2018 |
| Property Fellas Investments Limited | Real estate | 2021 |
| Property Fellas Limited | Real estate | 2015 |
| Property Zone (London) Limited | Real estate | 2011 |
| Property Zone Group Limited | Real estate | 2016 |
| Property Zone Maintenance Ltd | Administrative & support | 2020 |
| Proximal Living Ltd | Health & social care | 2024 |
| Quik Claims Limited | Other services | 2011 |
| Quote 4 Drones (UK) Limited | Information & communication | 2013 |
| Rafia Ltd | Real estate | 2016 |
| Ranasinghe Anaesthetic Services Limited | Health & social care | 2020 |
| Rapid Response Recovery Limited | Transport & logistics | 2009 |
| Relms Corp Ltd | Information & communication | 2022 |
| Remy Estates Ltd | Real estate | 2026 |
| Reyneke Group Ltd | Real estate | 2018 |
| Richard Curtin Legal Limited | Professional & scientific | 2024 |
| Richwater Films Ltd | Professional & scientific | 2023 |
| Ridgeview Court (Cockfosters) Limited | Households | 2002 |
| ROT Limited | Other services | 2015 |
| RRK Watches Limited | Wholesale & retail | 2024 |
| S Adams Trading Ltd | Wholesale & retail | 2012 |