| Middlelink International Ltd | Professional & scientific | 2025 |
| Milbanke Garret Limited | Professional & scientific | 2011 |
| Milford&Witley Ltd | Hospitality | 2021 |
| Miller & Sons Heating Plumbing Electrical Ltd | Construction | 2015 |
| Millhouse Carpet and Flooring Ltd | Wholesale & retail | 2018 |
| Millpond Investments Limited | Financial services | 2024 |
| Milly Green Designs Limited | Arts & recreation | 2011 |
| Milo Solutions Ltd | Construction | 2020 |
| Mindsparkpress Ltd | Information & communication | 2023 |
| Miss Fit Models Limited | Extraterritorial | 2015 |
| Mission Intelligence Ltd | Other services | 2024 |
| Mitchell Bullen Ltd | Financial services | 2023 |
| Mmtravelconnect Ltd | Information & communication | 2024 |
| MN Developments NE Ltd | Construction | 2021 |
| MN8 Property Consultants Ltd | Construction | 2013 |
| Moderncollab Ltd | Information & communication | 2020 |
| Modum Consulting Limited | Professional & scientific | 2019 |
| Mograni Ltd | Real estate | 2024 |
| Mojo Airport Ltd | Hospitality | 2013 |
| Molino Solutions Limited | Information & communication | 2010 |
| Momentum Planning Ltd | Professional & scientific | 2024 |
| Monkhill Limited | Real estate | 1986 |
| Monnington Design Consultants Limited | Manufacturing | 1995 |
| Monopoly Network Limited | Other services | 2013 |
| Montana Developments Limited | Construction | 2002 |
| Montrose Talent Ltd | Administrative & support | 2026 |
| Moorings House Residents Association Limited | Households | 1979 |
| Mora Logistics Ltd | Wholesale & retail | 2025 |
| Morningbridge Partners Ltd | Hospitality | 2023 |
| Mornington Investments Limited | | 1984 |
| Mosaic Remote Employment Ltd | Administrative & support | 2025 |
| Mosansho Care Limited | Health & social care | 2022 |
| Mountfield Equestrian Limited | Agriculture & fishing | 2017 |
| Mountrel Electric Limited | Wholesale & retail | 2026 |
| Mountrel Limited | Wholesale & retail | 2021 |
| MR FIX IT 247 Ltd | Construction | 2022 |
| MRE Europe Ltd | Real estate | 2016 |
| MUD Foods Limited | Manufacturing | 2009 |
| MUD Retreat Ltd | Other services | 2025 |
| Mugged IT Limited | Manufacturing | 2021 |
| Mulberry Street Enterprises Limited | Arts & recreation | 2012 |
| Mungo James Furniture Limited | Wholesale & retail | 2025 |
| Muscle.Inc.Co.Uk Ltd | Arts & recreation | 2009 |
| Mutualrapid Property Management Limited | Real estate | 1998 |
| Muud Ltd | Administrative & support | 2020 |
| My Baby Edit Limited | Wholesale & retail | 2014 |
| My Ndpa Ltd | Information & communication | 2024 |
| My Town Digital Limited | Information & communication | 2015 |
| N D Reynolds Ltd | Construction | 2009 |
| Nails Bar Haslemere Ltd | Other services | 2025 |
| Natalie Lazzam Estate Agents Ltd | Real estate | 2025 |
| Navsm Limited | Public administration | 2019 |
| NCC IT Consultancy Limited | Information & communication | 2001 |
| Ndube Productions Ltd | Information & communication | 2019 |
| Neale Investment Property Ltd | Real estate | 2025 |
| Nemesis Capital Limited | Financial services | 2000 |
| Nessa Properties LLP | | 2022 |
| NET Time Ltd | Hospitality | 2017 |
| Network Futures Limited | Information & communication | 1992 |
| Neural Reporting Limited | Information & communication | 2024 |
| New Barn Garden Design Limited | Administrative & support | 2022 |
| New GEN Aviation Ltd | Professional & scientific | 2022 |
| New GEN GBS Ltd | Professional & scientific | 2024 |
| Newland Project Management Ltd | Construction | 2020 |
| Nextgen Golf Club Limited | Arts & recreation | 2024 |
| Nicholas SAM Ltd | Hospitality | 2013 |
| Nightingale Place (Haslemere) Property Management Limited | Real estate | 2004 |
| Nina Murphy Associates LLP | | 2007 |
| NIO S Group Limited | Construction | 2021 |
| NK Chiropractic VET Ltd | Professional & scientific | 2025 |
| Noissue Europe Limited | Wholesale & retail | 2021 |
| Noissue UK Limited | Professional & scientific | 2021 |
| Nomad Latitudes Limited | Information & communication | 2026 |
| Nourish & Glow Limited | Wholesale & retail | 2021 |
| Novapulseo Ltd | Wholesale & retail | 2025 |
| Nuru Global Ltd | Wholesale & retail | 2024 |
| O Bond Building Ltd | Construction | 2015 |
| Oaklea House (Management) Limited | Households | 1982 |
| Oakley M & E Design Limited | Professional & scientific | 2013 |
| Oakley Stables Limited | Construction | 2004 |
| Oakstead Solutions Limited | Information & communication | 2014 |
| Oasis Medical Consulting Ltd | Other services | 2024 |
| Oasis Space Consulting Ltd | Professional & scientific | 2024 |
| Object Action Limited | Information & communication | 2010 |
| Objects D'Art Haslemere Limited | Wholesale & retail | 2009 |
| Ocho Sport Limited | Information & communication | 2020 |
| Office Bloc Haslemere Limited | Real estate | 2025 |
| OFR Trading Limited | Administrative & support | 2021 |
| Ogsec Consulting Ltd | Information & communication | 2024 |
| OH Building Services Limited | Construction | 2026 |
| OKO Limited | Professional & scientific | 2011 |
| Old Farm Lane (Grayswood) Limited | Households | 2014 |
| Old Mate Ltd | Manufacturing | 2025 |
| Oldercare (Haslemere) Limited | Health & social care | 1996 |
| Olive Tree Health Ltd | Health & social care | 2020 |
| Olivoz Ltd | Manufacturing | 2024 |
| Omega Close Protection Ltd | Administrative & support | 2013 |
| Omni Finance App Ltd | Information & communication | 2026 |
| One Management & Media LLP | | 2011 |
| One Martial Arts Academies Ltd | Arts & recreation | 2020 |