| Mike Plumb Design Ltd | Professional & scientific | 2011 |
| Mill Hill Space Co Ltd | Real estate | 2012 |
| Miller Electrical Commissioning Services Ltd | Professional & scientific | 2013 |
| Mira Technical Services Limited | Professional & scientific | 2006 |
| Miri Roshni | Health & social care | 2006 |
| MK Consultancy Group Limited | Professional & scientific | 2022 |
| MK Iconic Solutions Limited | Other services | 2019 |
| MMO Engineering Services Ltd | Administrative & support | 2007 |
| Moist Enterprises Limited | Professional & scientific | 2006 |
| Molloy Developments Limited | Construction | 2024 |
| Molloy Homes Limited | Construction | 2024 |
| Molloy Investments Holdings Limited | Financial services | 2018 |
| Monix Capital Limited | Professional & scientific | 2020 |
| Monix Legal Limited | Financial services | 2020 |
| Moornorth Ltd | Administrative & support | 2007 |
| Moorpoint Developments Ltd | Professional & scientific | 2002 |
| Morrisbrand Ltd | Administrative & support | 2007 |
| Mortgage Perspective and Protection Ltd | Financial services | 2024 |
| Motion Design Engineering Ltd | Professional & scientific | 2020 |
| Mrstlt Ltd | Professional & scientific | 2023 |
| Mulbury Homes (Hazel Grove) Limited | Construction | 2017 |
| MVL Joinery Ltd | Construction | 2018 |
| MWJ Home Limited | Real estate | 2022 |
| My Digital Accounts Limited | Information & communication | 2015 |
| My E-Commerce FD Ltd | Professional & scientific | 2023 |
| My Kurious Ltd | Hospitality | 2023 |
| Nereus Subsea Ltd | Other services | 2009 |
| Newtown Developments Limited | Construction | 2021 |
| Newvara Ltd | Professional & scientific | 2007 |
| NEX Engineering Limited | Professional & scientific | 2012 |
| NH Aero Ltd | Administrative & support | 2018 |
| Nicholas Booth Ltd | Professional & scientific | 2014 |
| NJR Recruitment Ltd | Administrative & support | 2009 |
| NN Building Solutions Limited | Construction | 2026 |
| NO Members Limited | Wholesale & retail | 2020 |
| Noble House Consultancy Services Limited | Professional & scientific | 2024 |
| Noble House Project Services Limited | Professional & scientific | 2024 |
| Nominal - T Ltd | Professional & scientific | 2005 |
| North West Medical Services Limited | Health & social care | 2015 |
| Northwest Neonatal Limited | Professional & scientific | 2011 |
| Nucontrol Ltd | Professional & scientific | 2024 |
| Octprint Limited | Administrative & support | 1995 |
| Oddwriters (TGM) Ltd | Professional & scientific | 2016 |
| Ofour Roofing Limited | Construction | 2023 |
| Oketone Ltd | Professional & scientific | 2007 |
| Olfactology Ltd | Manufacturing | 2023 |
| Olustreet & Kumsford Technologies Ltd | Administrative & support | 2012 |
| Ontrak (UK) Limited | Real estate | 2013 |
| Open Doors North West Ltd | Real estate | 2017 |
| Orbital Qatar Limited | Financial services | 2014 |
| Organic Gold Limited | Administrative & support | 2017 |
| OUR Property Limited | Real estate | 2021 |
| Overt Design Services Ltd | Administrative & support | 1999 |
| P S 5 Limited | Administrative & support | 1996 |
| Pagram Design Ltd | Professional & scientific | 2014 |
| PAJ Accounting Services Ltd | Financial services | 2011 |
| Paol Foto Ltd | Professional & scientific | 2021 |
| PAR Garden Maintenance Limited | Administrative & support | 2013 |
| Paradigm X Ltd | Professional & scientific | 2023 |
| Peach Law Limited | Administrative & support | 2014 |
| Pearson Booth Consulting Ltd | Professional & scientific | 2024 |
| Penchford Ltd | Other services | 2012 |
| People Heroes Limited | Administrative & support | 2023 |
| Pepperell Consulting Ltd | Professional & scientific | 2021 |
| Perfect Hospitality Limited | Other services | 2012 |
| Pet Grooming 315 Ltd | Other services | 2023 |
| Pet Heroes UK Limited | Information & communication | 2020 |
| Peter Wood Consultants Limited | Administrative & support | 2017 |
| Pharmacy Care Plus Limited | Health & social care | 2008 |
| Philip Bolton Design Limited | Professional & scientific | 1999 |
| Philip Durrant Associates Limited | Professional & scientific | 1991 |
| Pitt Works Limited | Professional & scientific | 2017 |
| PJ Gibson Holdings Limited | Financial services | 2020 |
| PMC Pension Trustees Ltd | Financial services | 2015 |
| Polaris Engineers Ltd | Professional & scientific | 1996 |
| Pollyannas Day Nursery Limited | Health & social care | 2003 |
| Porlmark Properties Limited | Real estate | 2014 |
| Portslink Ltd | Professional & scientific | 2002 |
| Portstead Engineering Ltd | Professional & scientific | 2003 |
| PR Psychiatry Ltd | Health & social care | 2015 |
| Prenton Ltd | Administrative & support | 2002 |
| PRESTIGE1971 Limited | Administrative & support | 2018 |
| PRH Interiors Limited | Other services | 2017 |
| Prime Technical Limited | Professional & scientific | 2023 |
| Pro Peaks Topco Limited | Arts & recreation | 2024 |
| Pro-Asset Finance Limited | Professional & scientific | 2008 |
| Proactive Heroes Limited | Administrative & support | 2023 |
| Product Heroes Limited | Administrative & support | 2024 |
| Property Heroes UK (PH) Limited | Administrative & support | 2024 |
| Property Perspective Investments Ltd | Real estate | 2015 |
| Prowess (Building Services) Limited | Professional & scientific | 1994 |
| PRP Creative Limited | Information & communication | 2017 |
| PST Engineering Ltd | Professional & scientific | 2006 |
| Qasby Limited | Administrative & support | 2006 |
| QB Boilers & Heating Solutions Ltd | Construction | 2025 |
| Quality Design Services Ltd | Professional & scientific | 1996 |
| Quetzal Engineering Ltd | Transport & logistics | 2018 |
| Quezon Ltd | Professional & scientific | 2022 |
| R S Transmission & Distribution Limited | Professional & scientific | 2017 |
| R-R Wave Property and Management Company Limited | Real estate | 2021 |