| MR B’S Sweets and Gifts, Margate Ltd Ltd | Other services | 2019 |
| MR MRS Realty Ltd | Real estate | 2024 |
| Mrmmr Ltd | Information & communication | 2020 |
| Mrptd Ltd | Financial services | 2024 |
| MRS Logistics Ltd | Transport & logistics | 2023 |
| MRS Woodruff Property ASH Limited | Real estate | 2025 |
| Mrstaxicanterbury Ltd | Transport & logistics | 2022 |
| MS Global Support Ltd | Information & communication | 2018 |
| Msinfosys Support Ltd | Information & communication | 2017 |
| Mslng & Co Ltd | Wholesale & retail | 2026 |
| Mtaseven Limited | Administrative & support | 2008 |
| MUCI1981 Ltd | Transport & logistics | 2024 |
| Muddy Pups Day Care Ltd | Other services | 2018 |
| Mukumlung Limited | Hospitality | 2026 |
| Mulberry Estates (Bridge) Limited | Construction | 2014 |
| Mulberry Estates (Sittingbourne) Limited | Construction | 2014 |
| Mulberry Estates (WYE) Limited | Construction | 2014 |
| Mulberry Property Solutions Limited | Administrative & support | 2015 |
| Mullerquip (GB) Garage Equipment Ltd | Wholesale & retail | 2026 |
| Mullings Associates Ltd | Professional & scientific | 2022 |
| Multi GAS Installations Limited | Construction | 1997 |
| Multidisciplinary Neuroscientific Technologies Ltd. | Information & communication | 2017 |
| Munbad Management Limited | Households | 2006 |
| Munchies of Kent Ltd | Hospitality | 2019 |
| Munday & Sons Electrical Contractors Ltd | Construction | 2009 |
| Murli Limited | Wholesale & retail | 2025 |
| Muscat Group Ltd | Financial services | 2025 |
| Mushtushcollective Ltd | Wholesale & retail | 2024 |
| Musical Kingdom Entertainment Agency Ltd | Arts & recreation | 2023 |
| Musiq Group Limited | Real estate | 2021 |
| Mustard Seed Singers Ltd | Health & social care | 2012 |
| Musthangandsons Ltd | Construction | 2025 |
| MW Distributors Ltd | Wholesale & retail | 2021 |
| MWR Performance Limited | Wholesale & retail | 2021 |
| My Bassingham Limited | Health & social care | 2013 |
| My Birth Support CIC | Health & social care | 2021 |
| My Camper Escape Ltd | Administrative & support | 2024 |
| My Campsite Ltd | Agriculture & fishing | 2025 |
| My Corinthian Limited | Extraterritorial | 2020 |
| My Guitar Club Ltd | Education | 2023 |
| My Outreach Ltd | Professional & scientific | 2019 |
| My Phonvap Ltd | Wholesale & retail | 2025 |
| My Plumber MAN Limited | Construction | 2004 |
| My Staff Limited | Professional & scientific | 2009 |
| MYA Estates Limited | Wholesale & retail | 2014 |
| Mybx Ltd | Professional & scientific | 2016 |
| Myerscough Craft Foundation Limited | Education | 2023 |
| Myiqis Limited | Wholesale & retail | 2019 |
| Mymixmaster Ltd | Information & communication | 2019 |
| Mymny Capital Ltd | Real estate | 2025 |
| Mymny Ltd | Financial services | 2018 |
| Mystole House Limited | Households | 1979 |
| Mystole Water Limited | Water & waste | 1965 |
| Mysuperfoods Limited | Manufacturing | 1998 |
| N and J Building Contractors Ltd | Construction | 2020 |
| N Bains Properties Limited | Real estate | 2021 |
| N Christie Ltd | Construction | 2019 |
| N E Transport Solutions Limited | Transport & logistics | 2017 |
| N S Builders Constructions Limited | Construction | 2020 |
| N&C Prevailing Global Company Ltd | Health & social care | 2014 |
| N&C Prevailing Properties Ltd | Real estate | 2018 |
| N&G Flooring Ltd | Construction | 2025 |
| N.L.C. Associates Ltd | Professional & scientific | 2006 |
| N.S. Elms Limited | Administrative & support | 2005 |
| Nackington Storage Ltd | Transport & logistics | 2019 |
| Nadav Rosenberg GP Limited | Financial services | 2020 |
| Nadav Rosenberg I LP | | 2020 |
| Naga Sports Company Ltd | Wholesale & retail | 2019 |
| Naiken-Payne Investments Limited | Real estate | 2019 |
| Naiken-Payne Limited | Professional & scientific | 2012 |
| Naiken-Payne Properties Limited | Real estate | 2022 |
| Nailbourne Community Foundation Limited | Health & social care | 2016 |
| Nailbourne Forge Limited | Manufacturing | 1995 |
| Nailed IT Design & Build Limited | Construction | 2022 |
| NAJ Curry Ltd | Hospitality | 2016 |
| NAM Real Estate Ltd | Real estate | 2021 |
| Nanb Transport Ltd | Transport & logistics | 2024 |
| Nancy & Betty Studio Ltd | Wholesale & retail | 2014 |
| Nash Grove Capital Limited | Financial services | 2022 |
| Natalex Logistics Ltd | Transport & logistics | 2025 |
| Nathantcg Ltd | Wholesale & retail | 2023 |
| Nath’S Paintwork Ltd | Construction | 2025 |
| Native Ecology LLP | | 2018 |
| Natural Poolscapes Ltd | Administrative & support | 2021 |
| Naval Expansion Ltd | Manufacturing | 2011 |
| NB Mobile Carvalet Ltd | Wholesale & retail | 2025 |
| NBS DHT Limited | Health & social care | 2014 |
| ND Land Limited | Construction | 2025 |
| Ndee Technologies Limited | Information & communication | 2024 |
| Neal R Smith Ltd | Construction | 2022 |
| NEC Associates Limited | Professional & scientific | 2015 |
| NEC Events Limited | Extraterritorial | 2015 |
| Nectarine Property Limited | Households | 2020 |
| Needham-Laing & Associates Limited | Professional & scientific | 2023 |
| Negotiation LAB Limited | Education | 2013 |
| Neil Stockley Building Ltd | Construction | 2025 |
| Nelsonthedogmedia Limited | Professional & scientific | 2021 |
| NEO Crystal Games Ltd | Information & communication | 2020 |
| Neon Reaper Productions Ltd | Information & communication | 2014 |
| Nepa Design Property Ltd | Real estate | 2020 |