| Maxotis Property Ltd | Real estate | 2026 |
| MBM Retail Ltd | Wholesale & retail | 2023 |
| MC Telecommunications Ltd | Information & communication | 2019 |
| Mcinnes Cyber Technology Services Ltd | Information & communication | 2018 |
| MDC Electrical Services Ltd | Construction | 2012 |
| MDF Rail Limited | Construction | 2016 |
| Medway Resources Limited | Other services | 2002 |
| MEE Creative Limited | Professional & scientific | 2011 |
| Meiwei Kitchen Limited | Hospitality | 2024 |
| MEO Cleaning Services Ltd | Administrative & support | 2026 |
| Merlin Game Studios Ltd | Information & communication | 2024 |
| Mervin Store Ltd | Wholesale & retail | 2024 |
| MG Asset Planning Ltd | Financial services | 2016 |
| Mgenix Ltd | Wholesale & retail | 2025 |
| Midmeds Limited | Wholesale & retail | 2005 |
| Militec Ltd. | Manufacturing | 1997 |
| Mills & Co Stays Ltd | Real estate | 2026 |
| Mini Market SW Ltd | Wholesale & retail | 2026 |
| Miracle Information Services Limited | Information & communication | 1991 |
| Mistral Consultancy Limited | Financial services | 2002 |
| MIX IT & FIX IT Ltd | Construction | 2024 |
| MJ Rees Developments Ltd | Real estate | 2023 |
| MJR Carpentry & Building Ltd | Manufacturing | 2024 |
| MM Care 24/7 Ltd | Health & social care | 2022 |
| Monmouthshire Electrical Maintenance Services Limited | Construction | 1995 |
| Monnema Ltd | Wholesale & retail | 2025 |
| Mooava Limited | Real estate | 2019 |
| Morgan Davies Property Ltd | Real estate | 2022 |
| Morris Carpets Ltd | Wholesale & retail | 2010 |
| Mortgage Broker Solutions Limited | Financial services | 2026 |
| MORTGAGE2MATCH Ltd | Financial services | 2018 |
| MOTIV8 Collections Ltd | Wholesale & retail | 2024 |
| Mount ASH Limited | Hospitality | 2023 |
| Mount ASH Munchies Ltd | Hospitality | 2025 |
| Mount Perry Perry Ltd | Extraterritorial | 2022 |
| Mount Rail Limited | Construction | 2018 |
| Mount Valley Ltd | Wholesale & retail | 2014 |
| Mountain ASH Office Management Ltd | Administrative & support | 2020 |
| Mountain ASH Render Systems Ltd | Construction | 2014 |
| Msjb Property Ltd | Real estate | 2026 |
| Mustaffas Ltd | Hospitality | 2025 |
| Muthu AA Ltd | Wholesale & retail | 2019 |
| N & M Scaffolding Ltd | Construction | 2019 |
| N & T Lowloader Ltd | Transport & logistics | 2019 |
| N T J Plasterers Limited | Construction | 2009 |
| N&B Construction Ltd | Construction | 2023 |
| N&T Property Ltd | Real estate | 2024 |
| NAV Cabs Ltd | Transport & logistics | 2025 |
| Navcam Ltd | Administrative & support | 2019 |
| Navigation Holdings Ltd | Financial services | 2023 |
| Navigation Property Developments Ltd | Real estate | 2023 |
| Navigation Security Services Limited | Administrative & support | 2005 |
| NE Bars Ltd | Hospitality | 2024 |
| Nesa Medical Limited | Health & social care | 2018 |
| Neurobusiness CIC | Administrative & support | 2023 |
| Neurometrik Ltd | Information & communication | 2025 |
| Neutralive Electrical Ltd | Construction | 2026 |
| New Wave Protection Solutions Ltd | Financial services | 2013 |
| Next Day Mobiles Ltd | Wholesale & retail | 2013 |
| Nixon's Workmen's Club and Institute Social Club Limited | Hospitality | 1992 |
| Nolon Property Ltd | Real estate | 2018 |
| NTJ Holdings Limited | Financial services | 2015 |
| Oak Rendering Contractors Ltd | Construction | 2025 |
| Oasishealthcareliving Ltd | Health & social care | 2020 |
| OHM of Vaping Ltd | Wholesale & retail | 2017 |
| OLH Homes Ltd | Real estate | 2026 |
| ON Brand Films Ltd | Information & communication | 2025 |
| Onyx Braking Systems (UK) Ltd | Manufacturing | 2017 |
| ORP Drylining Ltd | Construction | 2019 |
| Oscar TEL Ltd | Information & communication | 2014 |
| P B Services (Wales) Limited | Construction | 2003 |
| P.L.T Construction Limited | Construction | 2025 |
| P.O.D.D. Developments Ltd | Real estate | 2018 |
| Page Industrial Flooring Ltd | Construction | 2020 |
| Page Management Holdings Limited | Professional & scientific | 2001 |
| Paradigm Research Associates Ltd | Information & communication | 2009 |
| Paramount Engineering Limited | Manufacturing | 1993 |
| Patter Agency Limited | Professional & scientific | 2015 |
| Paulsmortgages Ltd | Financial services | 2017 |
| PBS Sand & Aggregates Limited | Transport & logistics | 2022 |
| PDC Drylining Limited | Construction | 2015 |
| Pendragon Spirits Ltd | Manufacturing | 2024 |
| Perseshio Ltd | Information & communication | 2022 |
| Phoenix HR Ltd | Administrative & support | 2017 |
| Pick Right Home Ltd | Real estate | 2025 |
| PIP Made Ltd | Manufacturing | 2020 |
| PR Roofing and Cladding Ltd | Construction | 2019 |
| Practice Solutions Limited | Information & communication | 2000 |
| Precision Kitchen Fitting Ltd | Construction | 2025 |
| Presto Solutions Limited | Information & communication | 2002 |
| Pretty COW Ltd | Arts & recreation | 2026 |
| Price Tree Surgery Ltd | Agriculture & fishing | 2023 |
| Prizm Engineering Ltd | Construction | 2025 |
| Pro-Juvenate Aesthetics Ltd | Health & social care | 2016 |
| Property HAT 2 Limited | Real estate | 2022 |
| Proplas Windows Ltd | Manufacturing | 2025 |
| Pulman & Sons Antiques & Collectables Ltd | Wholesale & retail | 2024 |
| Pupperazi Limited | Other services | 2018 |
| Puxty Developments Ltd | Real estate | 2025 |
| Q Global Limited | Wholesale & retail | 2025 |