| Midlands Preservation Ltd | Households | 2020 |
| Midlands Welded Fabrications Limited | Manufacturing | 2007 |
| Midwest Forklift Services Limited | Administrative & support | 1982 |
| Milan Pustai Enterprise Ltd. | Transport & logistics | 2011 |
| Milly's Group Limited | Wholesale & retail | 2017 |
| Minicomps Ltd | Wholesale & retail | 2023 |
| Mirela Solutions Ltd | Other services | 2018 |
| Mitch Carpentry Limited | Construction | 2022 |
| MK Car Traders Limited | Wholesale & retail | 2023 |
| MLD Property Services Limited | Real estate | 2024 |
| MLR Logistics Direct Limited | Wholesale & retail | 2016 |
| MM Construction Staffing Solutions Limited | Construction | 2021 |
| MME Property Lettings Ltd | Real estate | 2024 |
| MML Electrical Ltd | Construction | 2025 |
| MML Lowe Properties Ltd | Real estate | 2026 |
| MNC Legal Limited | Professional & scientific | 2024 |
| Moggy Lashes Limited | Health & social care | 2022 |
| Morpheus Biomedical Ltd | Administrative & support | 2015 |
| Morpheus Holdings Ltd | Administrative & support | 2015 |
| Morpheus Trading Ltd | Administrative & support | 2015 |
| Motonet Car Care Limited | Wholesale & retail | 2017 |
| Motonet Holdings Limited | Other services | 2020 |
| Moxie Social Work Ltd | Health & social care | 2024 |
| MPB Property Maintenance Services Ltd | Manufacturing | 2018 |
| Mpely Care Limited | Administrative & support | 2015 |
| MR Barber Ltd | Other services | 2021 |
| MR87 Ltd | Wholesale & retail | 2024 |
| MRC Demolition Limited | Construction | 2016 |
| MS Logistics Ltd | Transport & logistics | 2025 |
| Mtax Accountants Ltd | Professional & scientific | 2019 |
| Mthd Properties Ltd | Real estate | 2023 |
| MTM Holdings Limited | Professional & scientific | 2008 |
| MTM Limited | Manufacturing | 1998 |
| Mujeeb's Sweets & Savouries Ltd | Hospitality | 2019 |
| Multi-Tech Electrical Limited | Construction | 2008 |
| MWV Maintenance Limited | Administrative & support | 2017 |
| My Auto Solution Ltd | Wholesale & retail | 2021 |
| My DIY Supplies Ltd | Wholesale & retail | 2024 |
| Mystic Blue Limited | Wholesale & retail | 2024 |
| N.L. Rubber Limited | Manufacturing | 2001 |
| Nafisa Locum Limited | Health & social care | 2018 |
| Nambiar Services Ltd | Health & social care | 2010 |
| Natta Properties Limited | Construction | 2006 |
| Nattura-Energy UK Ltd | Construction | 2023 |
| Need to Know Network Limited | Information & communication | 2019 |
| Neilsen Tools Limited | Extraterritorial | 2012 |
| Nepalese Store Limited | Wholesale & retail | 2025 |
| Netsol Plus Ltd | Information & communication | 2017 |
| Neverhaven Games Ltd | Information & communication | 2024 |
| Nevermax Limited | Wholesale & retail | 2014 |
| New Baby Network CIC | Health & social care | 2020 |
| New Kitchen (Birmingham) Limited | Hospitality | 2022 |
| New Kitchen 168 Limited | Hospitality | 2024 |
| Newheath Limited | Information & communication | 2017 |
| Newton House Property Limited | Real estate | 2022 |
| Nextgen RI Ltd | Professional & scientific | 2024 |
| Nirankar Construction Ltd | Construction | 2023 |
| Nizi Holding Ltd | Wholesale & retail | 2018 |
| NJS Consultants Ltd | Wholesale & retail | 2016 |
| NK Elite Properties Ltd | Real estate | 2024 |
| NO.5 Kinver Ltd | Hospitality | 2024 |
| Normanby Practice Ltd | Health & social care | 2026 |
| Nova Air Conditioning & Refrigeration Ltd | Construction | 2026 |
| Novafateh Ltd | Wholesale & retail | 2025 |
| NPL Enterprise Ltd | Hospitality | 2025 |
| Nsec Ltd | Hospitality | 2023 |
| Nursewise Ltd | Health & social care | 2022 |
| Nuvuestudiouk Ltd | Professional & scientific | 2025 |
| Nyxx Ltd | Wholesale & retail | 2024 |
| Oakes CSM Ltd | Construction | 2015 |
| Oakham Renovations Ltd | Real estate | 2023 |
| Oakham Window Cleaners Ltd | Administrative & support | 2022 |
| Ohri Sweets Limited | Wholesale & retail | 2025 |
| Old 2 New House Renovations Ltd | Construction | 2026 |
| Oldbury United FC CIC | Education | 2020 |
| Oldbury United Football Club Ltd | Wholesale & retail | 2025 |
| Olotito Ltd | Construction | 2023 |
| One Business Village Ltd | Administrative & support | 2012 |
| One Stop Beauty Salon Ltd | Other services | 2026 |
| Ongono Distribution Ltd | Wholesale & retail | 2025 |
| Onkar Kalsi Ltd | Information & communication | 2023 |
| Online Learning Ltd | Education | 2017 |
| ORB S&N Ltd | Construction | 2022 |
| OSG Real Estate Limited | Real estate | 2024 |
| Ottolix Property Limited | Real estate | 2026 |
| P & D Properties UK Limited | Real estate | 2004 |
| P & J.D. Vehicle Logistics Limited | Transport & logistics | 2016 |
| P Sonsale Ltd | Health & social care | 2010 |
| P&B Heating Limited | Construction | 2024 |
| P. Mccann Limited | Professional & scientific | 1984 |
| Paddington Digital Ltd | Professional & scientific | 2022 |
| Pal's C&O Ltd | Wholesale & retail | 2025 |
| Pamut Healthcare Ltd | Health & social care | 2021 |
| Passive Living Ltd | Real estate | 2026 |
| Paul's C&O Ltd | Wholesale & retail | 2022 |
| Pavani Soft Limited | Information & communication | 2010 |
| Pavel HD CUT Ltd | Other services | 2022 |
| Paynes Trans Limited | Transport & logistics | 2016 |
| Pecen Ltd | Information & communication | 2025 |
| Pennell Associates Limited | Professional & scientific | 2013 |