| Milly Solutions Ltd | Construction | 2021 |
| Mineworks Ltd | Wholesale & retail | 2021 |
| Miss a Hussain Ltd | Professional & scientific | 2026 |
| Mistal Time Services Limited | Other services | 1984 |
| Mister Marketing Ltd | Professional & scientific | 2013 |
| MJ PUB Company Ltd | Hospitality | 2025 |
| MJ3 Electronic Ltd | Wholesale & retail | 2023 |
| Mjinspire Limited | Professional & scientific | 2015 |
| MK GAS Services Limited | Construction | 2015 |
| MK Northern Properties Ltd | Real estate | 2025 |
| MK Tuning Ltd | Wholesale & retail | 2025 |
| Mkcs Specialist Services Limited | Construction | 2009 |
| Mldoyley Limited | Professional & scientific | 2025 |
| MM Event Management Ltd | Professional & scientific | 2025 |
| MNC Events Ltd | Arts & recreation | 2025 |
| MOB 2008 Ltd | Transport & logistics | 2023 |
| Mojo Architecture Ltd | Professional & scientific | 2020 |
| Molly Peaches Ltd | Manufacturing | 2025 |
| Monds Nanny Limited | Health & social care | 2024 |
| Moneeb Limited | Hospitality | 2019 |
| Monks Technical Services Limited | Construction | 2023 |
| Moon Rent Cars Ltd | Wholesale & retail | 2026 |
| Morenna Tanning Studio Ltd | Other services | 2016 |
| Morgan S D Limited | Wholesale & retail | 2022 |
| Mori International Limited | Wholesale & retail | 2024 |
| Moss Car Sales, Servicing & Repairs Ltd | Wholesale & retail | 2018 |
| Motortech Garage Ltd | Wholesale & retail | 2023 |
| Mouflon Software Solutions Ltd | Information & communication | 2018 |
| Move Holdings Ltd | Real estate | 2026 |
| Movepoint Ltd | Real estate | 2026 |
| Movex Equipment Limited | Wholesale & retail | 2006 |
| MQM Restaurant Ltd | Hospitality | 2024 |
| MR AESTHETICS4U Ltd | Other services | 2023 |
| MR Eats Limited | Hospitality | 2017 |
| MR Fade (Leigh) Ltd | Other services | 2025 |
| MR Kent Properties Limited | Real estate | 2025 |
| Mradiant Ltd | Information & communication | 2019 |
| MS Booze & Convience Limited | Wholesale & retail | 2022 |
| MS Moaid Sami M Ahmed Ltd | Wholesale & retail | 2025 |
| MS Properties (North West) Limited | Real estate | 2017 |
| MS Window Systems Ltd | Construction | 2026 |
| MSA UK Estates Limited | Real estate | 2023 |
| MSC Rentals Ltd | Real estate | 2017 |
| MSE Associates Ltd. | Financial services | 2015 |
| MSE Joinery Limited | Construction | 2014 |
| MSG Property Investments Ltd | Real estate | 2022 |
| Msps Plastering Solutions Ltd | Construction | 2022 |
| Mstic Design Ltd | Manufacturing | 2003 |
| Mucleon Ltd | Health & social care | 2024 |
| Mulcahy's Services Limited | Administrative & support | 2018 |
| Mulcorp Limited | Real estate | 2020 |
| Mulprop Limited | Real estate | 2022 |
| Mulres Limited | Real estate | 2020 |
| Multi Metal Stockholders Limited | Wholesale & retail | 2002 |
| Multiprefer Limited | Information & communication | 1991 |
| Muscleprime Limited | Wholesale & retail | 2025 |
| Muzohub Limited | Professional & scientific | 2020 |
| MW Contractors Limited | Construction | 2017 |
| MWJ Stage Services Ltd | Arts & recreation | 2024 |
| My:Nd Space CIC | Wholesale & retail | 2025 |
| Mychance Ltd | Manufacturing | 2018 |
| Myden Ltd | Real estate | 2026 |
| N Burgess Construction Ltd | Construction | 2026 |
| N S Holdings (NW) Limited | Financial services | 2021 |
| Nahaja Limited | Wholesale & retail | 2023 |
| Nails for YOU 37 Ltd | Other services | 2023 |
| Nalu-Teera Ltd | Wholesale & retail | 2019 |
| Naruto Ltd | Wholesale & retail | 2024 |
| Nathan Battersby Cleaning Limited | Administrative & support | 2024 |
| Natures DEN Community Interest Company | Education | 2012 |
| Nautical Escapes Ltd | Transport & logistics | 2025 |
| Naveed Global Store Ltd | Wholesale & retail | 2026 |
| Naylor's Motor Services Limited | Wholesale & retail | 2017 |
| NBJ Limited | Health & social care | 2022 |
| Needham Plumbing & Heating Limited | Construction | 2024 |
| Needworth Limited | Construction | 2021 |
| Nefrit Ltd | Transport & logistics | 2016 |
| Neil Partington Electrical Services Limited | Construction | 2013 |
| Neil Townsend Equine Dentistry and Surgery Ltd | Professional & scientific | 2020 |
| Nellie’S Bistro Ltd | Hospitality | 2026 |
| Nemiah Limited | Information & communication | 2013 |
| Nemophilist Ltd | Construction | 2023 |
| NEO Motor Group Ltd | Wholesale & retail | 2024 |
| NES Electrical Limited | Construction | 1998 |
| Nest Professional Ltd | Health & social care | 2018 |
| Nestlings Care BC Limited | Health & social care | 2024 |
| Nestlings Care Ltd | Health & social care | 2010 |
| Neurodigital Limited | Information & communication | 2012 |
| New Ability (Torbay) Limited | Wholesale & retail | 2021 |
| New Ability Limited | Wholesale & retail | 2003 |
| New Asha Limited | Hospitality | 2025 |
| New Day Counselling LLP | | 2025 |
| New Good Food Leigh Ltd | Hospitality | 2026 |
| New Horizon Lodge Limited | Health & social care | 2024 |
| Newbury Autos Limited | Wholesale & retail | 1996 |
| Newlands Homes Ltd | Construction | 2014 |
| Newlands Investment Properties UK Ltd | Real estate | 2021 |
| Newlookcars Ltd | Wholesale & retail | 2018 |
| Newton Westpark Nursery | Education | 2014 |
| Newu Fit Limited | Professional & scientific | 2018 |