| Mustardseed Ltd | Professional & scientific | 2014 |
| Mustproducts Ltd | Wholesale & retail | 2025 |
| Mustty Ltd | Wholesale & retail | 2026 |
| Mutualite Congo Base Certifiee C.I.C. | Other services | 2026 |
| MUZ Cafe Ltd | Hospitality | 2018 |
| MV Financial Solutions Ltd | Other services | 2021 |
| Mvepp Ltd | Real estate | 2026 |
| MVH Enterprises Limited | Other services | 2013 |
| MVV Holdings Limited | Households | 2025 |
| MW Events Limited | Arts & recreation | 2022 |
| MW Ready Ltd | Professional & scientific | 2015 |
| Mwanaka’S Daughters Ltd | Hospitality | 2026 |
| Mwmcreatives Limited | Professional & scientific | 2026 |
| Mwmfightnight Limited | Arts & recreation | 2025 |
| Mxore Clothing Ltd | Wholesale & retail | 2021 |
| My Aesthetics and Beauty Limited | Health & social care | 2022 |
| My Barber & My TAN Limited | Other services | 2026 |
| My Beauty Nails SP Limited | Other services | 2024 |
| My Construction Design UK Limited | Professional & scientific | 2013 |
| My Cutz Barbers Ltd | Other services | 2022 |
| My Fitness Place Limited | Arts & recreation | 2019 |
| My Meat Centre Ltd | Wholesale & retail | 2024 |
| My Meze Grill Limited | Hospitality | 2026 |
| My Nuts UK Ltd | Wholesale & retail | 2019 |
| My Online Ltd | Administrative & support | 2022 |
| My Shop Enfield Ltd | Wholesale & retail | 2021 |
| My Solid Rock Property Limited | Real estate | 2025 |
| My Soul Space Limited | Arts & recreation | 2014 |
| My Tool Shed Limited | Extraterritorial | 2022 |
| My Trend Limited | Other services | 2018 |
| My Wellbeing Space CIC | Health & social care | 2023 |
| MYA ZAK Limited | Transport & logistics | 2019 |
| Mychurch.Events Limited | Professional & scientific | 2014 |
| Mydesignerss Limited | Real estate | 2025 |
| Myeai Limited | Professional & scientific | 2025 |
| Myfight Ltd | Arts & recreation | 2019 |
| Myhome Care Services Limited | Health & social care | 2023 |
| Mykeeper.Biz 02 Ltd | Information & communication | 2013 |
| Mylon Orthodontic Care Limited | Professional & scientific | 2015 |
| Mynenow Limited | Information & communication | 2025 |
| Myos Physiotherapy Limited | Education | 2026 |
| Myriad Consultancy Ltd | Construction | 2020 |
| Myrtle Doves Ltd | Wholesale & retail | 2021 |
| Myrtle Software Solutions Limited | Wholesale & retail | 2012 |
| Mystique Jewels of Ceylon Ltd | Manufacturing | 2021 |
| MZA Building Ltd | Construction | 2026 |
| MZH Consulting Limited | Professional & scientific | 2026 |
| MZK Properties Ltd | Real estate | 2022 |
| MZW Services Ltd | Administrative & support | 2025 |
| N & J Mehta Property Ltd | Real estate | 2014 |
| N Alla Ltd | Construction | 2020 |
| N Elemen Ltd | Information & communication | 2023 |
| N H Security Services Limited | Administrative & support | 2025 |
| N Yellon Consultancy Services Ltd | Professional & scientific | 1970 |
| N&M Group Limited | Other services | 2019 |
| N&S Electricals London Ltd | Construction | 2025 |
| N.Joy Catering Limited | Wholesale & retail | 2019 |
| N.L.I.G. (Investments) Ltd. | Financial services | 2007 |
| N1 Digital Ltd. | Information & communication | 2014 |
| N10PIZZA Ltd | Hospitality | 2018 |
| N16 Property Management Ltd | Real estate | 2020 |
| N18 Auto Ltd | Wholesale & retail | 2026 |
| NA Whyte Designs and Solutions Limited | Construction | 2015 |
| Naachiamaa Ltd | Health & social care | 2020 |
| Nabi Nails Limited | Other services | 2023 |
| Nachi's Ltd | Wholesale & retail | 2025 |
| Nacotalia Services Ltd | Information & communication | 2015 |
| Nadawelding Ltd | Manufacturing | 2022 |
| Naddora Limited | Wholesale & retail | 2022 |
| Nafe Limited | Other services | 2021 |
| Nagma Enfield Ltd | Construction | 2018 |
| Nagoya Hair Salon Limited | Other services | 2024 |
| Naijatreasures Ltd | Wholesale & retail | 2023 |
| Nail Bar L&M Limited | Other services | 2017 |
| Nail Design Ltd | Other services | 2016 |
| Nail Emporium Wakefield Limited | Other services | 2020 |
| Nailmama Ltd | Other services | 2024 |
| Nails & YOU Limited | Other services | 2022 |
| Nails 18 Limited | Other services | 2024 |
| Nails 38 Limited | Other services | 2024 |
| Nails 4U (Beverley) Limited | Other services | 2017 |
| Nails Art Limited | Other services | 2016 |
| Nails by Lorna Limited | Other services | 2025 |
| Nails by TN Limited | Other services | 2016 |
| Nailslux Limited | Other services | 2019 |
| Naimak Estates Ltd | Real estate | 2026 |
| NAL1 Ltd | Real estate | 2025 |
| NAM Long Limited | Other services | 2019 |
| NAM V Limited | Other services | 2019 |
| Namina Ltd | Real estate | 2026 |
| Namusoke Ltd | Health & social care | 2022 |
| Nana & AFA Ltd | Health & social care | 2009 |
| Nana Churcher Multimedia Limited | Professional & scientific | 2020 |
| Nana Quawson Youth Community Interest Company | Education | 2025 |
| Nana Tutoring Services Ltd | Education | 2023 |
| Nanda Tech Ltd | Wholesale & retail | 2020 |
| Nanev Contracts Ltd. | Construction | 2011 |
| Nannyprisla Childcare Ltd | Administrative & support | 2025 |
| Nano Tech Solutions and Consulting Limited | Information & communication | 2008 |
| Naolexconsult Ltd | Health & social care | 2011 |