| Montalleve Ltd | Wholesale & retail | 2019 |
| Montodale Ltd | Transport & logistics | 2016 |
| Moon Logix Ltd | Wholesale & retail | 2025 |
| Moor Fryer Ltd | Hospitality | 2021 |
| Moor Street Metals & Waste Recycling Ltd | Water & waste | 2018 |
| Moore & Sons (Holdings) Ltd | Real estate | 2022 |
| Moore Brothers Properties Limited | Construction | 2025 |
| Moore Commercials Ltd | Wholesale & retail | 2022 |
| Moore Commercials Properties Ltd | Real estate | 2025 |
| Moors Whitehouse Limited | Professional & scientific | 2002 |
| Morph Solutions Limited | Transport & logistics | 2025 |
| MOT Services (Midlands) Limited | Wholesale & retail | 2018 |
| Mothstone Limited | Manufacturing | 1987 |
| Motionlabs Group Ltd | Professional & scientific | 2026 |
| Motivation Care Limited | Administrative & support | 2022 |
| Motor 1 Limited | Wholesale & retail | 2008 |
| Motor Salvage (Fighting Cocks) Limited | Wholesale & retail | 1967 |
| Motorcycle Parts Direct Ltd | Wholesale & retail | 2019 |
| Motorjunction Ltd | Professional & scientific | 2020 |
| Motorlanka Limited | Wholesale & retail | 2019 |
| Moyle Investments 1970 Limited | Financial services | 2021 |
| MOZ Construction Ltd | Real estate | 2026 |
| MP Engineering Group Ltd. | Professional & scientific | 2024 |
| MP6 Properties Ltd | Real estate | 2024 |
| MPS Decorating, Maintenance & Refurbishment Limited | Construction | 2017 |
| MR Oilcan Limited | Wholesale & retail | 2010 |
| MR Whippy (Midlands) Ltd | Manufacturing | 2020 |
| MR1 Properties Ltd | Real estate | 2024 |
| MRB Carpentry and Building Ltd | Construction | 2022 |
| MRI Imaging Limited | Other services | 2025 |
| MRM Gore Group Ltd | Professional & scientific | 2017 |
| MRW Painting & Decorating Limited | Construction | 2017 |
| MS Property Investors Ltd | Real estate | 2019 |
| MS1 Sports Limited | Arts & recreation | 2011 |
| MSG Plumbing and Heating Solutions Limited | Construction | 2019 |
| MSJ Sons Ltd | Water & waste | 2024 |
| MSW Devs Limited | Information & communication | 2025 |
| MTC Recruitment Limited | Administrative & support | 2018 |
| Muhammad Qadir Ltd | Other services | 2020 |
| Mulraney Components Ltd | Manufacturing | 2022 |
| Multistore Services Limited | Financial services | 2021 |
| Musiclobster Limited | Administrative & support | 2015 |
| Mvm-Klenov&Son Ltd | Construction | 2018 |
| MW36 Properties Ltd | Real estate | 2024 |
| MW6 Properties Limited | Real estate | 2023 |
| My E Chef Ltd | Information & communication | 2013 |
| My Secret Pleasure Ltd | Wholesale & retail | 2023 |
| N & D Developments Ltd | Real estate | 2019 |
| N H Brands Limited | Financial services | 2017 |
| N H Inns Limited | Hospitality | 2023 |
| N V Matchmakers Limited | Administrative & support | 2017 |
| N&A Dallow Signs Ltd | Wholesale & retail | 2021 |
| N.E. Downing (Blackheath) Limited | Other services | 1963 |
| N.E. Downing (Holdings) Limited | Professional & scientific | 2007 |
| N.G. Turning Services Limited | Manufacturing | 2005 |
| N18 Coffee and Vending Machine Repairs Ltd | Wholesale & retail | 2026 |
| Naina Marikar UK Limited | Health & social care | 2025 |
| NAN Investments Ltd | Real estate | 2019 |
| Narie Holistic and Naturopathic Healing Clinic Ltd | Health & social care | 2018 |
| Narie Properties Ltd | Real estate | 2022 |
| Narlonverdiss Ltd | Transport & logistics | 2017 |
| Narrow Aisle Group Topco Limited | Financial services | 2022 |
| Narrow Aisle Holdings Limited | Financial services | 2018 |
| Narrow Aisle Limited | Manufacturing | 1976 |
| Nathan Aspinall Darts Limited | Arts & recreation | 2018 |
| Nathan Rafferty Darts Limited | Arts & recreation | 2022 |
| Nationwide Financial Advisors Limited | Financial services | 2003 |
| Naughty Goods Ltd | Wholesale & retail | 2023 |
| Navigate Commercial Finance Limited | Financial services | 2021 |
| Naya Qadam C.I.C. | Health & social care | 2019 |
| Naymarc Flooring Ltd | Construction | 2012 |
| NAZ Property Solutions Ltd | Households | 2025 |
| Necton Limited | Financial services | 2000 |
| Nelson Heating Solutions Ltd | Construction | 2025 |
| Nereids Theatre Company Ltd | Arts & recreation | 2022 |
| Nestle Hopkins Ltd | Wholesale & retail | 2020 |
| Network Property Solutions Ltd | Real estate | 2021 |
| Neurobotics Rehab Ltd | Health & social care | 2025 |
| Neva Investments Limited | Real estate | 1996 |
| New Hall Estates Holdings Limited | Financial services | 2021 |
| New Hall Estates Limited | Construction | 1966 |
| New Horizon Homes (Midlands) Limited | Construction | 2016 |
| New Horizon Homes Investments Ltd | Real estate | 2022 |
| New Roots Supported Living Ltd | Real estate | 2026 |
| New Street (Car Park) Management Company Limited | Extraterritorial | 2013 |
| Newbow Aerospace Limited | Manufacturing | 1964 |
| Newbow Electronics Limited | Financial services | 2007 |
| Newbow Group Limited | Financial services | 2007 |
| Newbow Holdings Limited | Financial services | 2024 |
| Newbridge Brewery Limited | Hospitality | 2013 |
| Newgate Ventures Limited | Construction | 2000 |
| Newnes Limited | Wholesale & retail | 2006 |
| News (Fittings, Flanges and Fasteners) Ltd | Manufacturing | 2005 |
| Nexora Advisors Ltd | Professional & scientific | 2025 |
| NGL Building Services Ltd | Construction | 2026 |
| Niche Commercial Estates Limited | Real estate | 2021 |
| Nicholas Fries Limited | Extraterritorial | 1988 |
| Nick & Stefan Motor Works Ltd | Wholesale & retail | 2019 |
| Nick Freeman Properties Limited | Real estate | 2020 |
| Nicky's Healthcare Limited | Health & social care | 2016 |