| MR Simon Jones Ltd | Real estate | 2024 |
| MRB Group Ltd | Construction | 2019 |
| Mrfmotors Ltd | Wholesale & retail | 2021 |
| Mrpottery Ltd | Other services | 2019 |
| MS & Co Supplies Limited | Wholesale & retail | 2023 |
| MS Adjusting Limited | Professional & scientific | 2022 |
| MS Mortgages (Southcoast) Ltd | Financial services | 2021 |
| Msja Ltd | Construction | 2019 |
| MSM Network Consultancy Limited | Professional & scientific | 2022 |
| MSM Training Limited | Education | 2014 |
| Muddy Boots Media Ltd. | Information & communication | 2026 |
| Muddy Carp Ltd | Wholesale & retail | 2019 |
| Mudtech Limited | Construction | 1998 |
| Mudtech Tank Division Limited | Professional & scientific | 2012 |
| Mulberry Financial Planning Limited | Financial services | 2020 |
| Mullin Cyber Labs Ltd | Information & communication | 2025 |
| Mulliners (Wimborne) Limited | Arts & recreation | 2016 |
| Multi Coating Systems Limited | Manufacturing | 2017 |
| Multi PCB Limited | Administrative & support | 2018 |
| Mumford Capital Limited | Financial services | 2020 |
| Mursell Property Company Limited | Financial services | 1998 |
| Musgrove PMC Limited | Professional & scientific | 2024 |
| Music Corner Limited | Wholesale & retail | 2018 |
| Muzai Ltd | Information & communication | 2026 |
| MV Creative Ltd | Information & communication | 2017 |
| MVB (M&E) Quantity Surveying Services Ltd | Professional & scientific | 2011 |
| MVS Audio Visual Communications Ltd | Wholesale & retail | 2021 |
| MVS Audio Visual Holdings Limited | Wholesale & retail | 2023 |
| MVS Audio Visual LLP | | 2012 |
| MW Plumbing Wholesale Ltd | Wholesale & retail | 2026 |
| MXH Carpentry Ltd | Manufacturing | 2024 |
| My Heart on a String Ltd | Wholesale & retail | 2020 |
| Mycoroots Dorset CIC | Manufacturing | 2025 |
| Myers Aerospace Ltd | Professional & scientific | 2025 |
| Mynks Change Limited | Professional & scientific | 2022 |
| Myriad Natural Toys Limited | Wholesale & retail | 2003 |
| Mysa Group Ltd | Real estate | 2020 |
| Mysa Investments Ltd. | Real estate | 2020 |
| Mysite Limited | Information & communication | 2019 |
| Mysuri Ltd | Information & communication | 2023 |
| Myvibe Ltd | Arts & recreation | 2025 |
| N & S Electrical Engineers Limited | Manufacturing | 2004 |
| N Starr Ltd | Financial services | 2022 |
| N T Surveying Ltd | Professional & scientific | 2019 |
| Naetharu Tech Limited | Information & communication | 2025 |
| Nahor Limited | Information & communication | 2021 |
| Nail Salons Group Ltd | Extraterritorial | 2024 |
| Naissa Ltd | Arts & recreation | 2005 |
| Namespace Ltd | Information & communication | 2024 |
| Nantes Ltd | Information & communication | 2023 |
| Narq Ltd | Information & communication | 2023 |
| Natalie DG Barton Ltd | Wholesale & retail | 2020 |
| Natame Limited | Real estate | 2020 |
| Naturadent Ltd | Health & social care | 2023 |
| Naturally Balmy Limited | Other services | 2015 |
| NAV Drainage Solutions Ltd | Construction | 2025 |
| NBK Event Catering Limited | Wholesale & retail | 2013 |
| NCD Electrical (Dorset) Ltd | Construction | 2016 |
| NEB Consulting Ltd | Professional & scientific | 2011 |
| NEB Property Limited | Real estate | 2022 |
| NEC Planning Solutions Limited | Construction | 2019 |
| Ned-Uk Ltd | Information & communication | 2022 |
| Nedyak Sourcing Company Limited | Wholesale & retail | 2023 |
| Negative Edge Limited | Information & communication | 2016 |
| Neiros Limited | Information & communication | 2022 |
| Neish Consulting Ltd | Information & communication | 2018 |
| Nelson Services (Dorset) Ltd | Information & communication | 2019 |
| Neon Macaroni Limited | Information & communication | 2021 |
| Nerdee Ltd | Information & communication | 2021 |
| Ness Apps Ltd | Information & communication | 2024 |
| NET Lease Ltd | Real estate | 2026 |
| Net-A-Celestine Limited | Information & communication | 2023 |
| Netro Designs Limited | Professional & scientific | 2017 |
| Network Adventures Group Ltd | Professional & scientific | 2025 |
| Network Telex (Holdings) Limited | Information & communication | 2013 |
| Neural Clarity Ltd | Information & communication | 2026 |
| Neurotherapy Limited | Health & social care | 2003 |
| New Barn Farm (Dorset) Five Ltd | Real estate | 2021 |
| New Barn Farm (Dorset) Four Ltd | Real estate | 2021 |
| New Barn Farm (Dorset) Ltd | Construction | 2015 |
| New Barn Farm (Dorset) One Ltd | Real estate | 2020 |
| New Barn Farm (Dorset) Three Ltd | Real estate | 2020 |
| New Barn Farm (Dorset) Two Ltd | Real estate | 2020 |
| New Brands Limited | Wholesale & retail | 2010 |
| New Cuthbury Investments Ltd | Financial services | 2021 |
| New Forest Clothing Company Limited | Wholesale & retail | 2012 |
| New Forest LOG Cabins Limited | Construction | 2002 |
| New Forest Power Ltd | Professional & scientific | 2016 |
| New Forest Shepherds Huts Limited | Construction | 2015 |
| New Forest Van Sales Limited | Wholesale & retail | 2020 |
| New Moon Consulting Limited | Information & communication | 2018 |
| New Motech Ltd | Wholesale & retail | 2026 |
| New Profile Holdings Limited | Real estate | 2022 |
| New Profile Ltd | Professional & scientific | 2014 |
| New Projections Ltd. | Professional & scientific | 2017 |
| New Real Goals FN Bournemouth Ltd | Arts & recreation | 2021 |
| New Street Property Consultancy Limited | Real estate | 2016 |
| Newdata Design Limited | Information & communication | 2000 |
| Newell Estates Limited | Real estate | 2017 |
| Newfloor Ltd. | Construction | 2018 |