| Marigold Event Management Limited | Hospitality | 2022 |
| Mariom Transport Ltd | Transport & logistics | 2021 |
| Marius Radovici Ltd | Transport & logistics | 2017 |
| Marlow Playhouse Limited | Other services | 2016 |
| Maros MS Ltd | Transport & logistics | 2016 |
| Masterplan Electrical Services Limited | Construction | 2019 |
| Masters at Work Painting and Decorating Services Ltd | Construction | 2019 |
| Masters Telecoms Ltd | Information & communication | 2017 |
| Matthias Drivers Ltd | Transport & logistics | 2020 |
| Maxswift Ltd | Professional & scientific | 2016 |
| MAY Jackson Ltd | Real estate | 2019 |
| Mayfair Leather Limited | Wholesale & retail | 2016 |
| MB Asset Group Ltd | Real estate | 2025 |
| MDA Connect Ltd | Other services | 2020 |
| MDD Transport Ltd | Transport & logistics | 2020 |
| Mead Heating Projects Limited | Construction | 2025 |
| Meero Limited | Manufacturing | 2016 |
| Meticulous Witty Ltd | Wholesale & retail | 2019 |
| MG Construction Essex Ltd | Extraterritorial | 2021 |
| MG Groundworks Ltd | Administrative & support | 2018 |
| MIE Lifestyle Concept Ltd | Wholesale & retail | 2020 |
| Mighty Touch Limited | Health & social care | 2014 |
| Mihnea&Daniel Transport Ltd | Administrative & support | 2016 |
| Millarex Limited | Health & social care | 2019 |
| Millrite Mews Management Limited | Households | 2015 |
| Mindfull Learning Ltd | Education | 2020 |
| MJ Carpentry & Joinery Ltd | Construction | 2017 |
| Moredot Healthcare Limited | Health & social care | 2012 |
| MPD Haulage Limited | Transport & logistics | 2019 |
| MR. KS Holdings Ltd | Professional & scientific | 2021 |
| MR. KS Properties Limited | Real estate | 2021 |
| Msvdrive Limited | Administrative & support | 2016 |
| Muela Ltd | Manufacturing | 2023 |
| Multipoint (UK) Limited | Construction | 2006 |
| My Step Ahead Ltd | Health & social care | 2022 |
| Naneno Consultancy Limited | Administrative & support | 2013 |
| National College for the Creative Industries Limited | Education | 2020 |
| Nca/Nelsoncunha Ltd | Information & communication | 2018 |
| NCS London Limited | Wholesale & retail | 2009 |
| NCS Office Systems (England) Limited | Wholesale & retail | 2009 |
| NCS Office Systems (Service) Limited | Wholesale & retail | 2009 |
| NEO Logistics Ltd | Transport & logistics | 2014 |
| Neoneira Consult Ltd | Professional & scientific | 2018 |
| NG Pro-Gas Ltd | Construction | 2015 |
| Nimarto Ltd | Transport & logistics | 2024 |
| North London Electrical Services Limited | Energy | 2019 |
| North London Shopfronts Ltd | Manufacturing | 2024 |
| NTG Property Solutions Limited | Real estate | 2020 |
| NVC Brickwork Ltd | Construction | 2022 |
| Nyahaveh Collections Ltd Ltd | Manufacturing | 2021 |
| OBQ Ltd | Construction | 2019 |
| Ocimex Limited | Transport & logistics | 2009 |
| OL Ceilings Limited | Construction | 2021 |
| Olajosh Limited | Other services | 2017 |
| OLG Style Ltd | Manufacturing | 2017 |
| Olive Rose Contractors Limited | Extraterritorial | 2022 |
| Ololade Ventures Ltd | Professional & scientific | 2021 |
| Omni Consulting LLC Limited | Professional & scientific | 2015 |
| ONI and Sons Properties Ltd | Real estate | 2022 |
| Opmg SPV Limited | Transport & logistics | 2025 |
| Optimum Security Supplies Limited | Construction | 2005 |
| Outdrive Ltd | Other services | 2015 |
| P&H Care Services Ltd | Health & social care | 2024 |
| P.I.P. Management Limited | Real estate | 1985 |
| P2YSTEMS Limited | Information & communication | 2015 |
| Parchinos Services International Ltd | Professional & scientific | 2024 |
| Pasiak Ltd | Transport & logistics | 2022 |
| PBD Consulting Limited | Information & communication | 2021 |
| PCG Investment Properties Ltd | Real estate | 2020 |
| PCS Construction Ltd | Construction | 2019 |
| Peacefield Wellness Services Ltd | Health & social care | 2026 |
| Pebble Beach Homes Limited | Real estate | 2025 |
| Peddds Services Ltd | Health & social care | 2018 |
| PF BIS Transport Ltd | Transport & logistics | 2015 |
| PGA Flooring Limited | Construction | 2015 |
| Philadelphia Riverside Ministries | Other services | 2020 |
| Phoenix (Legal) Consulting Ltd | Professional & scientific | 2011 |
| Piper Self Storage Limited | Transport & logistics | 2016 |
| PMT Driving Serv Limited | Transport & logistics | 2020 |
| Pollock Taylor Limited | Professional & scientific | 2007 |
| Power Alpina Ltd | Construction | 2018 |
| Power Transformer Test Consulting Ltd | Professional & scientific | 2006 |
| Premiumm Care CIC | Public administration | 2024 |
| Prestige Containers Ltd | Extraterritorial | 2022 |
| Primepoint Commercial Ltd | Financial services | 2025 |
| Probaburst Ltd | Information & communication | 2020 |
| Property Contract Maintenance Ltd | Administrative & support | 2004 |
| Property Ladder Limited | Real estate | 2005 |
| Propile Limited | Construction | 2011 |
| Quadrant Residents Limited | Professional & scientific | 2011 |
| R Rose Builders Ltd | Construction | 2021 |
| Ra-Eurocars Limited | Wholesale & retail | 2020 |
| Rachael Consulting Limited | Professional & scientific | 2007 |
| Radmar Ltd | Transport & logistics | 2018 |
| Rahuri Ltd | Real estate | 2021 |
| Rainham Shutters & Doors Ltd | Construction | 2015 |
| Raising Successful Children Ltd | Education | 2020 |
| Rakowski Trans Ltd | Transport & logistics | 2023 |
| Realstar Network Ltd | Information & communication | 2020 |
| Reboost Fitness Limited | Health & social care | 2025 |