| Modus Red Ltd | Extraterritorial | 2022 |
| Moff Group Ltd | Wholesale & retail | 2021 |
| Moitech Associates Ltd | Administrative & support | 2022 |
| Mojo Creative Production Ltd | Manufacturing | 2007 |
| Mojon Investments Limited | Real estate | 1962 |
| Molejam Limited | Professional & scientific | 2015 |
| Molossi Investments Limited | Real estate | 2022 |
| Molossi Leisure Limited | Hospitality | 2014 |
| Molossi Limited | Other services | 2020 |
| Monesh LLP | | 2013 |
| Monitor Audio Group Limited | Financial services | 2018 |
| Monitor Audio Limited | Manufacturing | 2006 |
| Mons View Ltd | Extraterritorial | 2022 |
| Montpelier Private Finance Limited | Financial services | 2009 |
| Moon Aesthetics Academy Limited | Education | 2023 |
| Moon Aesthetics Limited | Wholesale & retail | 2021 |
| Moon Botox Academy Limited | Education | 2023 |
| Moon Dermal Filler Academy Limited | Education | 2023 |
| Moon FAT Dissolving Academy Limited | Education | 2023 |
| Moon Skin Booster Academy Limited | Education | 2023 |
| Moon Vitamin Injections Academy Limited | Education | 2023 |
| Moorcroft Paving and Landscape Ltd | Administrative & support | 2019 |
| Moorings Residents Association Limited (the) | Households | 1972 |
| Moorings Residents Freehold Limited | Households | 2018 |
| More Space Architecture Ltd | Professional & scientific | 2017 |
| Morgan Allen Surveyors Limited | Real estate | 2025 |
| Mosaic Life Ltd | Administrative & support | 2021 |
| Mother of Pearl Hospitality Ltd | Hospitality | 2026 |
| Mount Construction Limited | Construction | 2019 |
| Mount Liell Court West Management Company Limited | Households | 2002 |
| Mountain Top Partners Ltd | Professional & scientific | 2020 |
| Mountring Limited | Wholesale & retail | 1998 |
| Move Group Holdings Limited | Administrative & support | 2018 |
| MP Installations Limited | Construction | 2005 |
| Mpower Electrical Limited | Construction | 2022 |
| MR Mezzanine Limited | Construction | 2012 |
| MRP Traders Ltd | Wholesale & retail | 2018 |
| MRR Tyres & Services Limited | Wholesale & retail | 2025 |
| MS Decorating Services Limited | Construction | 2018 |
| MSB Canvey Ltd | Extraterritorial | 2017 |
| MSB Rayleigh Ltd | Extraterritorial | 2017 |
| Muhammad Amir Ltd | Wholesale & retail | 2025 |
| Murphy and Sons Landscaping Ltd | Administrative & support | 2022 |
| Musarc Choir Ltd | Education | 2013 |
| Mushroom Theatre Company Ltd | Arts & recreation | 2014 |
| MVW Design & Consultancy Limited | Administrative & support | 2015 |
| MWP Holdings Ltd | Extraterritorial | 2018 |
| MWS Air Services Ltd | Construction | 2020 |
| Mwwe Consulting Ltd | Information & communication | 2022 |
| My Mind Media Ltd | Administrative & support | 2011 |
| My Mortgage Angel Limited | Financial services | 2016 |
| My-Workplace.Co.Uk Limited | Construction | 2010 |
| Myleads Partners Ltd | Administrative & support | 2026 |
| Myna Optical Limited | Health & social care | 2022 |
| Mynexthome-Uk Limited | Real estate | 2022 |
| N.F. Collins 2020 Ltd | Wholesale & retail | 2020 |
| Nanny CHA Cha's Coffee Shop Ltd | Wholesale & retail | 2019 |
| Nass Property Solution Limited | Real estate | 2022 |
| National Business Awards Ltd | Professional & scientific | 2019 |
| Natural GAS Limited | Construction | 2016 |
| Navmii Holdings Limited | Financial services | 2010 |
| Navmii Ltd | Extraterritorial | 2009 |
| Navmii Publishing Ltd | Information & communication | 2007 |
| Navmii UK Ltd | Information & communication | 2009 |
| Navmii US Ltd | Professional & scientific | 2009 |
| Naylor Jones Ltd | Construction | 2018 |
| Neelikon Specialities Europe Ltd | Wholesale & retail | 2015 |
| Nest in Essex Limited | Real estate | 2015 |
| Network Construction (GB) 1 Limited | Construction | 2009 |
| Neurotribe UK CIC | Administrative & support | 2018 |
| Nevendon Gardens Residents Company Limited | Households | 2002 |
| New Canon Studio Ltd | Information & communication | 2026 |
| New Choice Drives Patio and Landscaping Ltd | Administrative & support | 2025 |
| New City Motorcycles Ltd | Wholesale & retail | 2014 |
| New Dawn Comics Limited | Wholesale & retail | 2017 |
| New Leaf (WWF) Limited | Financial services | 2011 |
| New Leaf Distribution Limited | Financial services | 2005 |
| New Level Youth FC C.I.C. | Arts & recreation | 2023 |
| New River Environmental Limited | Construction | 2018 |
| New Xing Long Ltd | Hospitality | 2018 |
| Newsflash Newsagents Limited | Wholesale & retail | 2022 |
| Newton Contracts Ltd | Construction | 2022 |
| NEX Facades Ltd. | Construction | 2026 |
| Next Generation Externals Limited | Construction | 2020 |
| Next Generation Recruitment Limited | Administrative & support | 2023 |
| Next Generation Scaffolding Limited | Construction | 2013 |
| Next Generation TEK Limited | Administrative & support | 2023 |
| Next Genz League Essex Ltd | Arts & recreation | 2026 |
| Nextgen Metals Ltd | Other services | 2026 |
| Ngage Events Limited | Administrative & support | 2016 |
| Niamh's Emporium of Mystical Oddities Ltd | Arts & recreation | 2024 |
| Niche Homes Real Estate Ltd | Real estate | 2022 |
| Nightbrew Ltd | Hospitality | 2026 |
| Nineteen 53 Limited | Real estate | 2019 |
| Nini's Lounge Limited | Health & social care | 2014 |
| Nipah Consult Limited | Health & social care | 2024 |
| Nirolf Ltd | Transport & logistics | 2026 |
| Nitrous Ltd | Information & communication | 2016 |
| NJD & Co Accountants Ltd | Other services | 2018 |
| NO1 Property Investment Ltd | Real estate | 2025 |