| Melvyn Newman Limited | Professional & scientific | 2021 |
| Melvynnh Limited | Professional & scientific | 2021 |
| Meme Architects LLP | | 2010 |
| Meme Developments Ltd. | Construction | 2016 |
| Mendfield Pharma Ltd | Professional & scientific | 2022 |
| Mercury Classic Cars Limited | Transport & logistics | 1997 |
| Mercury Travel Limited | Professional & scientific | 1991 |
| Mercy Global Consult Inc Ltd | Administrative & support | 2015 |
| Merlins Attic Limited | Administrative & support | 2017 |
| Mesh Warehouse Ltd | Extraterritorial | 2021 |
| Metalcore Industries Ltd. | Mining & quarrying | 2016 |
| Metro City Plaza Ltd | Hospitality | 2025 |
| Mets Moves Limited | Transport & logistics | 2026 |
| Miah's Cuisine Ltd | Hospitality | 2022 |
| Microcab Industries Limited | Manufacturing | 2002 |
| Micronet Solutions Ltd | Other services | 2021 |
| MID Kent Growers Limited | Wholesale & retail | 1973 |
| Middle Thomas Limited | Wholesale & retail | 2025 |
| Mika's Care Ltd | Health & social care | 2022 |
| Milestone Brokerage Limited | Financial services | 2024 |
| Mills & Boom Ltd | Information & communication | 2012 |
| Milton Advertising Hoardings Limited | Administrative & support | 2021 |
| Mind Ascending Productions Ltd | Information & communication | 2024 |
| Mindful Coaching and Consulting Limited | Education | 2018 |
| Mindful Little Sprouts Ltd | Arts & recreation | 2025 |
| Miura Development Limited | Information & communication | 2016 |
| MK1 Mechanical Engineering Services Limited | Manufacturing | 2018 |
| MKH Property Ventures Ltd | Real estate | 2026 |
| MME Engineering Limited | Manufacturing | 1995 |
| Mmpm Project Management Ltd | Construction | 2019 |
| MMT Associates Limited | Information & communication | 2014 |
| Modus Construction Consultants Limited | Professional & scientific | 2013 |
| Modus Construction Management Limited | Professional & scientific | 2024 |
| Moncrieff Miller Limited | Other services | 2023 |
| Monks' Granary Wine and Cheese Ltd | Wholesale & retail | 2025 |
| Monkton Music Limited | Arts & recreation | 1973 |
| Monkton Solar Limited | Energy | 2025 |
| Monro Studios Ltd | Information & communication | 2021 |
| Montrose Media Limited | Information & communication | 2003 |
| Moor Organics Limited | Agriculture & fishing | 2007 |
| Mot's Only Limited | Administrative & support | 2017 |
| Mother of Invention CIC | Education | 2025 |
| Motivocean UK Limited | Professional & scientific | 2006 |
| Mount Enfranchisement Group Ltd | Households | 2024 |
| MP Corporation Ltd | Wholesale & retail | 2025 |
| Mpjdesign Limited | Extraterritorial | 2017 |
| MRR Design Ltd | Wholesale & retail | 2024 |
| Muirfield Holdings Limited | Administrative & support | 2020 |
| Mumma and ME Ltd | Other services | 2024 |
| Munio Ltd | Information & communication | 2005 |
| Muse Creative Studio Ltd | Professional & scientific | 2024 |
| Mute Elephant Music Limited | Arts & recreation | 2014 |
| MWY Limited | Information & communication | 2016 |
| My Storage Group Ltd | Transport & logistics | 2025 |
| N Connell Consulting Ltd | Professional & scientific | 2025 |
| N E Holmes Limited | Extraterritorial | 2020 |
| Nader Investments Ltd | Professional & scientific | 2020 |
| Nagara Consulting Limited | Professional & scientific | 2012 |
| Nailgem Faversham Ltd | Other services | 2019 |
| Nampon PK Muay Thai Ltd | Arts & recreation | 2024 |
| Napleton House Management Company Ltd | Real estate | 2010 |
| National Fruit Collections Trust | Administrative & support | 1990 |
| Natural Born Movers Ltd | Administrative & support | 1997 |
| Navenby Green Energy Centre Ltd | Energy | 2022 |
| Ndataba Investment UK Ltd | Wholesale & retail | 2025 |
| Necton Green Energy Centre Ltd | Energy | 2022 |
| Need a Space Ltd | Administrative & support | 2012 |
| Neptune Bars and Events Ltd | Hospitality | 2019 |
| Neptune Pool Services Limited | Administrative & support | 2018 |
| Neptune Property Partners Ltd | Real estate | 2019 |
| Nevell Holdings LLP | | 2023 |
| New Creek Ltd | Households | 2022 |
| New Creek Properties Ltd | Real estate | 2020 |
| New Dads United CIC | Other services | 2026 |
| New Hatch Limited | Professional & scientific | 2025 |
| New Marton Green Energy Centre Limited | Energy | 2023 |
| New Nest Limited | Real estate | 2016 |
| Newby West Solar Limited | Energy | 2014 |
| Newgen Assets Ltd | Financial services | 2025 |
| Newmafh Limited | Extraterritorial | 2021 |
| Newmafruit Farms Limited | Financial services | 1951 |
| Newton Place Medical LLP | | 2012 |
| Next Mark Ltd | Wholesale & retail | 2020 |
| NG Events Ltd | Information & communication | 2011 |
| NGS Security Ltd | Administrative & support | 2015 |
| Nick Dawson Designs Limited | Manufacturing | 2001 |
| Ninfield Green Energy Centre Limited | Energy | 2022 |
| Niusha Doyom Ltd | Information & communication | 2019 |
| Nixi Body Limited | Wholesale & retail | 2019 |
| NO Flights Club Limited | Extraterritorial | 2025 |
| NO Place Like Home Limited | Health & social care | 2012 |
| NO. 8 Holdings Ltd | Extraterritorial | 2024 |
| NO.5 Construction Project Management Ltd | Construction | 2019 |
| Norham Bright Ltd | Construction | 2022 |
| North Downs Real Food Company Ltd | Manufacturing | 2016 |
| North Light Associates Ltd | Construction | 2019 |
| Northern Town Amenity Land Limited | Professional & scientific | 2002 |
| Northpoint Advisory Ltd | Professional & scientific | 2025 |
| Northvale East Ltd | Professional & scientific | 2026 |
| Northvale Holdings Ltd | Financial services | 2026 |