| MKR Recovery Limited | Wholesale & retail | 2020 |
| MKR Recovery Solutions Limited | Wholesale & retail | 2025 |
| Mlks&M Care Limited | Health & social care | 2024 |
| MM Cleaningsoln Limited | Administrative & support | 2023 |
| MMM Mega Rare Cards Ltd | Wholesale & retail | 2026 |
| MNE Holdings Limited | Professional & scientific | 2024 |
| MNE Properties Limited | Real estate | 2024 |
| MNT Plumbing and Drainage Limited | Water & waste | 2022 |
| MO Property Solutions Limited | Construction | 2010 |
| Mobideli Limited | Extraterritorial | 2018 |
| Mocanal Ltd | Other services | 2016 |
| Modenvo Ltd | Professional & scientific | 2024 |
| Monkey Property 2020 Limited | Administrative & support | 2020 |
| Monkeying Around Ltd | Arts & recreation | 2026 |
| Montague Mews Residents Management Company Limited | Households | 2013 |
| More Than Words Consulting Ltd | Public administration | 2023 |
| Morepour Ltd | Other services | 2010 |
| Morgan Kasey Homes Limited | Construction | 2020 |
| Morning Star Studios Ltd | Extraterritorial | 2025 |
| Mosool Limited | Information & communication | 2018 |
| Mother HEN Ltd | Education | 2019 |
| MOTION-3 Limited | Professional & scientific | 2025 |
| Mountain Roofing Ltd | Construction | 2025 |
| Moveandmore Ltd | Transport & logistics | 2024 |
| Movemint Ltd | Administrative & support | 2024 |
| Moyna Gong Limited | Hospitality | 2024 |
| MR Snob Limited | Wholesale & retail | 2015 |
| MRA Aviation Management Systems Ltd | Professional & scientific | 2020 |
| Mrcs Property Group Limited | Construction | 2021 |
| MRK Diagnostics Ltd | Health & social care | 2024 |
| MRK Global Imports Ltd | Wholesale & retail | 2024 |
| Mrmn Partners Ltd | Construction | 2024 |
| Mrtp Consultancy Ltd | Professional & scientific | 2019 |
| Msim Ltd | Information & communication | 2014 |
| MSR Consulting Limited | Administrative & support | 2014 |
| MT Buka Enterprize Ltd | Health & social care | 2010 |
| Mtbf Investments Ltd | Real estate | 2023 |
| Mucky Pupz Canine Services Ltd | Other services | 2026 |
| Muhit & Co Accountants Limited | Professional & scientific | 2022 |
| Munji Maood Limited | Wholesale & retail | 2025 |
| Murcia Holdings Limited | Professional & scientific | 2003 |
| Murray and Murray (Charlwood) Limited | Wholesale & retail | 2013 |
| Musti's Catering Limited | Hospitality | 2024 |
| My Maison Limited | Real estate | 2019 |
| My Treasured Pets Ltd | Wholesale & retail | 2021 |
| Myshop Europe Limited | Wholesale & retail | 2017 |
| Mystic Water Productions Ltd | Information & communication | 2023 |
| Myzz Ltd | Real estate | 2023 |
| N25 Ltd | Professional & scientific | 2025 |
| N3 Contracts Ltd | Construction | 2023 |
| N30 Lifestyle Ltd | Other services | 2015 |
| Naan Run Limited | Hospitality | 2024 |
| Narayanen Ltd | Health & social care | 2014 |
| Nathan Anthony Limited | Wholesale & retail | 1996 |
| Natur Cosmetics Ltd | Manufacturing | 2023 |
| Naumov Radiography Services Limited | Health & social care | 2014 |
| NB Car Services Ltd | Wholesale & retail | 2017 |
| NC Legal Solutions Ltd | Professional & scientific | 2024 |
| NDK Building Services Limited | Construction | 2014 |
| Ndukaku Global Holdings Ltd | Wholesale & retail | 2025 |
| Ndukaku Whole Foods Ltd | Wholesale & retail | 2024 |
| Nectaris Limited | Professional & scientific | 2007 |
| Neishe Kitchen Ltd | Hospitality | 2015 |
| Nekati Consultancy Ltd | Professional & scientific | 2024 |
| Nekati Holdings Limited | Professional & scientific | 2021 |
| Neoterik Solutions Limited | Extraterritorial | 2021 |
| Nestledown Boarding Kennels Limited | Other services | 2016 |
| NET KAY Limited | Real estate | 2015 |
| Netclover Technologies Limited | Information & communication | 2024 |
| New Oaks House Holdings Limited | Construction | 2021 |
| New Oaks House Limited | Construction | 2021 |
| New Penny Productions Limited | Arts & recreation | 1989 |
| Newmans Solicitors Limited | Professional & scientific | 2012 |
| Newmax Security Ltd | Administrative & support | 2019 |
| Newmax Trident Group Ltd | Manufacturing | 2026 |
| Newstead Hall, Horley Management Limited | Real estate | 1998 |
| Nexus Alpha Group Holdings Limited | Professional & scientific | 2009 |
| Nexus Alpha Limited | Information & communication | 1994 |
| Nexus Alpha LOW Power Systems Limited | Information & communication | 2001 |
| Nexus Domani Limited | Information & communication | 2024 |
| Nexus Futuri Ltd | Information & communication | 2025 |
| NGT Building Services Ltd | Professional & scientific | 2015 |
| Niaco Properties Ltd | Real estate | 2022 |
| Nick Knox Plant Hire Limited | Administrative & support | 2015 |
| Nickys Home Care Services Ltd | Health & social care | 2023 |
| Nige Watson Limited | Information & communication | 2019 |
| Nikolajsen Ltd | Financial services | 2017 |
| Nine Excellence Limited | Wholesale & retail | 2011 |
| Ninelives Images Limited | Professional & scientific | 2012 |
| Niniche Limited | Hospitality | 2025 |
| NKS Homecare Limited | Households | 2016 |
| NM Structural Engineering Ltd | Professional & scientific | 2023 |
| NO 1 Private Ltd | Professional & scientific | 2015 |
| Noire Nail Studio Ltd | Other services | 2026 |
| Nonkue Ltd | Health & social care | 2024 |
| Nookfield Services Ltd | Real estate | 2019 |
| Nova Heating and Plumbing Ltd | Construction | 2023 |
| Nova Mysk Ltd | Wholesale & retail | 2024 |
| Novaland Investments Ltd | Construction | 2024 |
| NQ Hits Limited | Information & communication | 2012 |