| Murtagh & Maloney Limited | Construction | 2006 |
| Murvic Contracts Limited | Construction | 1979 |
| Murvic Holding Ltd | Real estate | 2021 |
| Musalore Ltd | Wholesale & retail | 2025 |
| Muscle Station Limited | Arts & recreation | 2013 |
| Mushalaz Limited | Health & social care | 2015 |
| Music, Seen (Arts) CIC | Professional & scientific | 2024 |
| Mustafa Doncaster Ltd | Wholesale & retail | 2024 |
| Mustafa Halal Store Doncaster Ltd | Wholesale & retail | 2025 |
| Mustav (2008) Limited | Wholesale & retail | 2007 |
| Mustazuk Ltd | Wholesale & retail | 2021 |
| Mutluca Catering Ltd | Hospitality | 2024 |
| MV Adams Ltd | Construction | 2005 |
| MVM Haulage Ltd | Transport & logistics | 2020 |
| MVP. I. D Ltd | Manufacturing | 2019 |
| Mvwb Ltd | Administrative & support | 2015 |
| MW - Appliances Ltd | Administrative & support | 2025 |
| MW Automation Limited | Professional & scientific | 2011 |
| MW Management Consultants Ltd | Professional & scientific | 2021 |
| MW Oak Company Ltd | Manufacturing | 2019 |
| MW Train Door Solutions Ltd | Professional & scientific | 2022 |
| Mwaolee Private Limited | Extraterritorial | 2020 |
| Mwiche’S Properties Ltd | Real estate | 2025 |
| Mwitemberg. Ltd | Wholesale & retail | 2020 |
| MWS Environmental Ltd | Water & waste | 2023 |
| MX Bike Breakers Ltd | Wholesale & retail | 2017 |
| MX Technical Services Ltd | Wholesale & retail | 2022 |
| MX5UK Limited | Wholesale & retail | 2026 |
| MXN Enterprises Limited | Real estate | 2014 |
| My Aesthetics Studio Ltd | Other services | 2025 |
| My Beauty Basement Limited | Wholesale & retail | 2022 |
| My Clever House Limited | Wholesale & retail | 2009 |
| My Fast Food Limited | Hospitality | 2025 |
| My Godly Spouse Ltd | Information & communication | 2018 |
| My Heating Solutions Ltd | Construction | 2024 |
| My History Ltd | Information & communication | 2014 |
| My Hull Roofer Ltd | Construction | 2019 |
| My Litigation Friend Ltd | Professional & scientific | 2017 |
| My MED Accounts Limited | Administrative & support | 2025 |
| My Mission Ltd | Real estate | 2016 |
| My Money Expert Limited | Financial services | 2018 |
| My New Build Ltd | Construction | 2024 |
| My New Home Limited | Real estate | 2016 |
| My Pension Expert Limited | Financial services | 2011 |
| My Permission to Pause Limited | Wholesale & retail | 2026 |
| My Pretties UK Limited | Wholesale & retail | 2023 |
| My Property Solutions (Rentals) Ltd | Real estate | 2020 |
| My Property Store Ltd. | Real estate | 2011 |
| My Tactics Company Ltd | Wholesale & retail | 2022 |
| My Tactics Sport & Community CIC | Education | 2026 |
| My Village Home Ltd | Real estate | 2023 |
| MYA Aesthetics Ltd | Other services | 2023 |
| Myeden.Online Limited | Other services | 2018 |
| Myko Holdings Ltd | Financial services | 2016 |
| Myles Offshore Limited | Construction | 2025 |
| MYM Store Ltd | Wholesale & retail | 2022 |
| Mymedic Healthcare Limited | Public administration | 2024 |
| Mymedic Limited | Administrative & support | 2017 |
| Mymedpal UK Limited | Manufacturing | 2026 |
| Myphizz Limited | Education | 2021 |
| Myriam Ltd | Transport & logistics | 2019 |
| Myst Vapes Ltd | Wholesale & retail | 2024 |
| Mystical Fiction Ltd | Wholesale & retail | 2025 |
| Mysticmoth Ltd | Wholesale & retail | 2025 |
| Myszur Ltd | Real estate | 2023 |
| Myweb Ltd | Information & communication | 2023 |
| MZ Property Services (Doncaster) Ltd | Construction | 2024 |
| N & a Durdy (Agricultural Contractors) Ltd | Agriculture & fishing | 2013 |
| N & B Property Rental Limited | Real estate | 2023 |
| N & J Ball Group Limited | Real estate | 2018 |
| N & J Ball Holdings LLP | | 2023 |
| N & L Milo Miles Limited | Construction | 2011 |
| N & S Martin Ltd | Transport & logistics | 2013 |
| N & T Shah LLP | | 2020 |
| N a International Limited | Professional & scientific | 2000 |
| N Africa TV Ltd | Information & communication | 2025 |
| N Best Order Limited | Hospitality | 2016 |
| N Bland Property Limited | Real estate | 2024 |
| N Calvert & SON Ltd | Transport & logistics | 2011 |
| N Hetherington and SON Limited | Wholesale & retail | 2003 |
| N Hirst Decorators Limited | Construction | 2011 |
| N Hutchinson Contractor Ltd | Construction | 2024 |
| N Levick & SON Limited | Manufacturing | 2001 |
| N M Design London Ltd | Other services | 2013 |
| N Seddon Properties Ltd | Households | 2024 |
| N Stutting Construction Ltd | Construction | 2016 |
| N Stutting Properties Ltd | Real estate | 2021 |
| N V Electrics Limited | Construction | 2014 |
| N X 1 (UK) Limited | Administrative & support | 2001 |
| N&A Jewellery Ltd | Wholesale & retail | 2014 |
| N&B Developments (Haxey) Limited | Construction | 2024 |
| N&G Transport Ltd | Transport & logistics | 2023 |
| N&Hospitality Limited | Hospitality | 2026 |
| N&J Harrington Ltd | Hospitality | 2025 |
| N&L Hospitality Limited | Hospitality | 2023 |
| N&L Pro+ Utilities Limited | Construction | 2025 |
| N&N Designs Ltd | Information & communication | 2020 |
| N&N Select Exec Procurement Ltd | Professional & scientific | 2014 |
| N&N Select Property Limited | Real estate | 2020 |
| N&S Barrett Electrical Limited | Construction | 2023 |