| Mini & ME Cafe Ltd | Hospitality | 2025 |
| Mint Estate Agents Ltd | Real estate | 2021 |
| Mintd Group Limited | Other services | 2015 |
| Mintina Limited | Financial services | 2018 |
| Minusone Club Ltd | Professional & scientific | 2024 |
| Miso Agency Ltd | Professional & scientific | 2025 |
| MIT Build and Renovations Limited | Construction | 2012 |
| Mitb Limited | Information & communication | 2008 |
| Mitram and Co. Ltd | Wholesale & retail | 2024 |
| Mjae Consulting Limited | Administrative & support | 2007 |
| MJG Projects Limited | Construction | 2014 |
| MK Network Enterprise Ltd | Professional & scientific | 2025 |
| MLG Investment Partners Limited | Professional & scientific | 2012 |
| MLV Developments Ltd | Real estate | 2024 |
| MML Trading Limited | Extraterritorial | 2012 |
| Modernise IT Limited | Information & communication | 2016 |
| Modlock Consulting Limited | Professional & scientific | 2016 |
| Montway Holdings Limited | Hospitality | 2020 |
| Moody Electrical Ltd | Administrative & support | 2019 |
| Morgyo Ltd | Information & communication | 2018 |
| Morrell & Harvey Engineering Co.,Limited | Manufacturing | 1960 |
| Motokraft Ltd | Wholesale & retail | 2024 |
| Motor Industry Training Limited | Education | 2005 |
| MRJ Consultants Ltd | Other services | 2018 |
| Ms-Inter-Group Limited | Wholesale & retail | 2023 |
| Msea Care Ltd | Health & social care | 2025 |
| Muddy Boots Kids Sports Club Ltd | Health & social care | 2016 |
| Muddyboots Camps (Franchise) Ltd | Health & social care | 2024 |
| Mulcahy Limited | Information & communication | 2018 |
| MVM Surrey Ltd | Construction | 2023 |
| MWM Engineering Limited | Professional & scientific | 2023 |
| My Fit Coach Limited | Other services | 2016 |
| N.T.G.M. Limited | Construction | 2017 |
| Nailux & Beauty Ltd | Other services | 2019 |
| NAQ Developments Ltd | Construction | 2016 |
| NAQ Entertainment Ltd | Arts & recreation | 2012 |
| Nasa Property Services Ltd | Real estate | 2026 |
| Nascent Services (UK) Ltd | Financial services | 2025 |
| Natalie Marie Beauty Clinic Ltd | Other services | 2016 |
| Nathan Winn Property Services Ltd | Construction | 2021 |
| NCM Holdings Limited | Real estate | 1993 |
| NDW Creative Ltd | Professional & scientific | 2011 |
| Neko Enterprise Ltd | Information & communication | 2021 |
| NET Bloom Ltd | Information & communication | 2021 |
| New Ocean Wave Charters Ltd | Administrative & support | 2013 |
| New Ocean Wave Training Ltd | Education | 2018 |
| Nexgen Facilities Services London Ltd | Administrative & support | 1999 |
| Nexgen Facilities Services Ltd | Administrative & support | 2001 |
| Nexgen GRP 2 Limited | Administrative & support | 2017 |
| Nexgen Holdings 1 Limited | Administrative & support | 2017 |
| Nexgen London Ltd | Administrative & support | 2006 |
| Nexgen UK 3 Limited | Administrative & support | 2017 |
| Nicky Bull Limited | Health & social care | 2024 |
| Nikkerball Limited | Information & communication | 2011 |
| Nina Breddal Limited | Manufacturing | 1962 |
| Niomes Boutique Ltd | Wholesale & retail | 2025 |
| Niwa Gardens and Outdoor Spaces Ltd | Administrative & support | 2025 |
| NO.38 Candles & Co Limited | Manufacturing | 2021 |
| Node Home Ltd | Construction | 2025 |
| Nolangreen Limited | Administrative & support | 2023 |
| Nordic Fire Limited | Construction | 2015 |
| Nordic Room Limited | Construction | 2014 |
| Nordic Wood Ltd | Construction | 2003 |
| Nordra Design Ltd | Other services | 2025 |
| Noroil Publishing House Ltd A/S | | 1980 |
| Nova Nexus 3D Ltd | Manufacturing | 2025 |
| Novatra Group Ltd | Administrative & support | 2025 |
| Novion Ingredients Limited | Wholesale & retail | 2026 |
| NOW SHE Builds Ltd | Information & communication | 2025 |
| Nsoa Limited | Real estate | 2021 |
| Nsoa Roofing and Maintenance Limited | Construction | 2023 |
| Nspsy Ltd | Health & social care | 2018 |
| Numa Laser Clinic Marlow Ltd | Health & social care | 2025 |
| OAA Tailoring Ltd | Other services | 2023 |
| Oakfield Accountancy Ltd | Professional & scientific | 2011 |
| Oander Limited | Professional & scientific | 2013 |
| Oasis Vehicle Rentals Limited | Wholesale & retail | 2020 |
| Occupational Retirement Review Ltd | Financial services | 2016 |
| Ocean 7 Limited | Professional & scientific | 2004 |
| Oddo (High Road Byfleet) Limited | Households | 1976 |
| Ohms Fire and Security Ltd | Administrative & support | 2008 |
| One Stop Air Shop Limited | Wholesale & retail | 2003 |
| Optimus Construction Consulting Ltd | Construction | 2022 |
| Origin Known Ltd | Wholesale & retail | 2022 |
| Osyka IT Limited | Information & communication | 2015 |
| OUR Bathrooms Ltd | Wholesale & retail | 2018 |
| Oyster Lane Flat Limited | Real estate | 2026 |
| Oyster Lane Hand Car Wash Ltd | Wholesale & retail | 2025 |
| Pacepro Ltd | Health & social care | 2024 |
| PAN Investment Properties Ltd | Real estate | 2022 |
| Pangaea Records Limited | Information & communication | 2011 |
| Parame Ltd | Administrative & support | 2025 |
| Park Court Management (West Byfleet) Limited | Real estate | 2012 |
| Park House Kitchens Limited | Administrative & support | 1997 |
| Parriscollects Ltd | Wholesale & retail | 2024 |
| Parsons Medical Ltd | Education | 2016 |
| Party People (Woking) Limited | Wholesale & retail | 2019 |
| Paul Swain Art Limited | Arts & recreation | 2017 |
| Paxiko Ltd | Professional & scientific | 2026 |
| Payment Systems Consultancy Ltd | Professional & scientific | 2015 |