| M D Pipes Ltd | Construction | 2017 |
| M T Group Holdings Limited | Financial services | 2018 |
| Madanti Ltd | Extraterritorial | 2015 |
| Mahazo Ltd | Extraterritorial | 2015 |
| Maple (380) Limited | Households | 2014 |
| Margaret Ellison Interiors Ltd | Professional & scientific | 2018 |
| Marina Rose Limited | Professional & scientific | 1998 |
| Martello Tower Trading Ltd | Wholesale & retail | 2018 |
| Martyn Newman Property Services Limited | Construction | 2007 |
| Matthew SIX Thirty Three Ltd | Administrative & support | 2025 |
| Maverick Creative Ltd | Professional & scientific | 2023 |
| Mayne BIO Analytics Ltd | Information & communication | 2022 |
| Mcsc Limited | Financial services | 2022 |
| Mel's Property Ltd | Real estate | 2019 |
| Mel's Top Cutz Ltd | Other services | 2014 |
| Merlin Grace Limited | Wholesale & retail | 2014 |
| Merry Homes Limited | Real estate | 2015 |
| Metafab Structures Ltd | Manufacturing | 2023 |
| MGL Carpentry & Building Limited | Construction | 2020 |
| Mid-West Care Limited | Health & social care | 2023 |
| Midland Paving and Resin Ltd | Construction | 2025 |
| Mike Bayliss Holdings Limited | Professional & scientific | 2012 |
| Milvus Healthcare Consulting Ltd. | Professional & scientific | 2016 |
| Minimagtray Ltd | Wholesale & retail | 2021 |
| Mining Enterprise Ltd | Mining & quarrying | 2024 |
| Mitcheldean MOT Centre Ltd | Wholesale & retail | 2003 |
| MJM Creative Solutions Ltd | Financial services | 2023 |
| Mlewisdesign Ltd | Administrative & support | 2024 |
| MML Lash Supplies LLP | | 2025 |
| Mobilebene Ltd | Manufacturing | 2023 |
| Modern British Etiquette Limited | Education | 2018 |
| Mongoose Motors Limited | Wholesale & retail | 2026 |
| Monny's Beauty Services Ltd | Other services | 2025 |
| More Than MOW Ltd | Arts & recreation | 2023 |
| Morgsco Ltd | Real estate | 2026 |
| Mount Pleasant Parking Management Limited | Extraterritorial | 2010 |
| Mountford & Harrison Construction Limited | Construction | 2026 |
| MTM Project Services Limited | Administrative & support | 2012 |
| Municipal Vehicle Spares Limited | Professional & scientific | 2013 |
| Murrells Developments Ltd | Construction | 2023 |
| N P S Drylining Limited | Construction | 2002 |
| Nailed IT Home Solutions LLP | | 2025 |
| Nala X Limited | Other services | 2023 |
| Naturally Good Taste Ltd | Hospitality | 2024 |
| Natures Forage Ltd | Wholesale & retail | 2018 |
| NET International Limited | Administrative & support | 1990 |
| New Chapter Developments Ltd | Construction | 2023 |
| New Futures Supported Housing CIC | Other services | 2020 |
| Newent School of Motoring Ltd | Extraterritorial | 2022 |
| Nick Turner Ltd | Arts & recreation | 2003 |
| NKP Limited | Real estate | 2020 |
| Nova Home Support Ltd | Health & social care | 2025 |
| NPS (Dean) Holdings Ltd | Financial services | 2021 |
| NPS Dean Developments Ltd | Construction | 2021 |
| NUM-369 Ltd | Administrative & support | 2018 |
| Nyttco Ltd | Information & communication | 2026 |
| Oakfield Contracting Services Ltd | Construction | 2016 |
| OMI Construction Ltd | Construction | 2025 |
| OR Tuition Limited | Education | 2026 |
| Orhan's Cafe Ltd | Hospitality | 2018 |
| Origin Health Group Ltd | Health & social care | 2021 |
| Ottely Ltd | Manufacturing | 2024 |
| P & M Developments (2023) Ltd | Real estate | 2023 |
| P & M Radford Services Ltd | Manufacturing | 2015 |
| P.D.C. Electronic Services Limited | Manufacturing | 1984 |
| Padley Properties Ltd | Real estate | 2026 |
| PAF Construction Ltd | Construction | 2025 |
| Panglowin Ltd | Arts & recreation | 2025 |
| Park That Bike Ltd | Construction | 2010 |
| Park View Agricultural Consultancy Ltd | Professional & scientific | 2019 |
| Partovo Ltd | Information & communication | 2025 |
| Patrick Recovery Limited | Wholesale & retail | 2025 |
| Paul Raymond Flooring Ltd | Extraterritorial | 2025 |
| PC Remote Ltd | Extraterritorial | 2021 |
| Pearson & Clutterbuck Ltd | Construction | 2013 |
| Pegler Consulting Ltd | Professional & scientific | 2022 |
| Peony Properties UK Limited | Real estate | 2007 |
| Petedf Ltd | Information & communication | 2023 |
| Pilgrove Retail Centre Ltd | Wholesale & retail | 2017 |
| PIN & Stitch Ltd | Wholesale & retail | 2025 |
| Pioneer Plumbing Supplies Limited | Wholesale & retail | 1997 |
| Pipehawk PLC | Administrative & support | 2000 |
| Pipparosewardrobe Ltd | Wholesale & retail | 2025 |
| Plastotype Limited | Manufacturing | 2015 |
| PLW Construction Holdings Ltd | Construction | 2024 |
| PLW Construction Limited | Construction | 2012 |
| Pollocks Plumbing and Heating Limited | Construction | 2025 |
| Precision Machinery (Gloucester) Limited | Administrative & support | 2008 |
| Premier Building Ventures Limited | Construction | 2000 |
| Prestige Comfort Ltd | Wholesale & retail | 2023 |
| Project Restoration CIC | Hospitality | 2025 |
| Propertunity North East Limited | Construction | 2019 |
| PROWELD1963 Limited | Manufacturing | 2018 |
| Pr£Stig£ Products Ltd | Wholesale & retail | 2022 |
| PSM Brickwork (Glos) Limited | Construction | 2016 |
| Puffelly Ltd | Hospitality | 2024 |
| Quality Engineered Products (EOT) Limited | Financial services | 2024 |
| Quality Engineered Products Limited | Manufacturing | 2003 |
| Quimico E-Cigarette Solutions Limited | Administrative & support | 2016 |
| R & a Martin Limited | Construction | 2008 |