| Lyons Leonidou Limited | Professional & scientific | 2012 |
| M D Lotus Limited | Wholesale & retail | 2012 |
| M Omer Limited | Hospitality | 2017 |
| M.N.M. and Partners Limited | Real estate | 1973 |
| M.N.M. Building Contractors Limited | Construction | 1991 |
| Madrigal Allergy Limited | Health & social care | 2025 |
| MAG Restaurants Limited | Hospitality | 2025 |
| Magnolia Medical LLP | | 2009 |
| Maldini Baggio Limited | Hospitality | 2015 |
| Maldini Dining Limited | Hospitality | 2020 |
| Marco Scarci Limited | Health & social care | 2013 |
| Maripam Limited | Real estate | 2022 |
| Maripen Group Ltd | Hospitality | 2026 |
| Marquee Investments III Limited | Real estate | 2024 |
| Masebak Ltd | Real estate | 2025 |
| Mava Trade Ltd | Wholesale & retail | 2020 |
| Maverick & Woolf Property Services Limited | Real estate | 2015 |
| Maycav Construction Limited | Wholesale & retail | 1991 |
| Mayfaith Group Ltd | Hospitality | 2026 |
| Mayormedical Consulting Limited | Health & social care | 2009 |
| MDC PCN Health Ltd | Health & social care | 2024 |
| Medcare Services Ltd | Health & social care | 2007 |
| Medicare Medical Services LLP | | 2009 |
| Medochemie (U.K.) Limited | Administrative & support | 1990 |
| Medsain Limited | Health & social care | 2023 |
| Mira Shah Limited | Health & social care | 2010 |
| Miscano Limited | Information & communication | 2024 |
| Mnnds Limited | Health & social care | 2023 |
| Moderna Consulting Limited | Health & social care | 2006 |
| MR Sander Ltd | Information & communication | 2023 |
| Nabu Property Investments Limited | Real estate | 2024 |
| Nbsk MED Ltd | Health & social care | 2020 |
| Neek Lashes Limited | Wholesale & retail | 2022 |
| Nektous Ltd | Construction | 2024 |
| New River Health Limited | Health & social care | 2009 |
| Newham GP Co-Operative Ltd. | Health & social care | 1994 |
| Nexa Clean Ltd | Other services | 2026 |
| Ngskills LLP | | 2023 |
| Ninan Health Limited | Health & social care | 2025 |
| Noblemed Limited | Health & social care | 2022 |
| Noushi Limited | Real estate | 2016 |
| Novel Building Services Ltd | Construction | 2024 |
| Oaklands Property & Developments Limited | Construction | 1964 |
| Oasys Systems Limited | Information & communication | 1988 |
| Ocalda Limited | Professional & scientific | 2022 |
| OLLY99 Consultancy Limited | Information & communication | 2012 |
| ORL Facilities Ltd | Health & social care | 2024 |
| Orpington PCN Limited | Health & social care | 2022 |
| Palm Health Limited | Health & social care | 2024 |
| Palm IT Solutions Limited | Information & communication | 2011 |
| Parkview 16+ Supported Accommodation & Outreach Limited | Health & social care | 2017 |
| Parkview Care (Broadstairs) Limited | Health & social care | 2010 |
| Parkview Care Group Limited | Financial services | 2018 |
| Parkview Education Limited | Education | 2016 |
| Parkview Fostering Limited | Health & social care | 2017 |
| Parkview Group Holdings Limited | Health & social care | 2010 |
| Parkview Training Limited | Education | 2018 |
| Patco Consultancy Limited | Health & social care | 2012 |
| Peareswood Services Ltd | Hospitality | 2023 |
| Penge PCN Limited | Health & social care | 2022 |
| Pier Connection Investments Limited | Construction | 1994 |
| PKB 23 Limited | Health & social care | 2024 |
| PKR Consultancy & Management Ltd | Other services | 2019 |
| PLM MED Limited | Health & social care | 2014 |
| Practice Management ARE US Limited | Health & social care | 2022 |
| Premium Office Spaces Ltd | Real estate | 2011 |
| Prescience Media 4 Limited Liability Partnership | | 2008 |
| Prime Fire & Security Systems Ltd | Administrative & support | 2017 |
| Prodr Limited | Health & social care | 2025 |
| Prospect Tree Health Care (Operations) Limited | Health & social care | 2010 |
| Protonneurorad Ltd | Health & social care | 2024 |
| QAG Associates Limited | Health & social care | 2007 |
| Ramsay Brown Cloud Accounting Limited | Professional & scientific | 2015 |
| Ramsay Brown LLP | | 2019 |
| RCD17 Consultancy Limited | Professional & scientific | 2024 |
| Real Estate (Management) Limited | | 1980 |
| Redroom Trading Company Limited | Extraterritorial | 2009 |
| Reed & Write Limited | Manufacturing | 1996 |
| Retreat (GB) Limited | | 2011 |
| Retreat Logistics Limited | | 2011 |
| Rich Success Training Consultancy Ltd | Professional & scientific | 2025 |
| Richardson Consulting and Medical Education Services Limited | Health & social care | 2020 |
| RL Strategy Consulting Limited | Professional & scientific | 2018 |
| Rnwk Limited | Professional & scientific | 2020 |
| Rockdoc London Ltd | Health & social care | 2018 |
| Room One the Clinic Ltd | Health & social care | 2017 |
| Royal Docks Medical Ltd | Health & social care | 2008 |
| Rsvs Limited | Real estate | 2009 |
| S.A.K.11 Limited | Health & social care | 2023 |
| Saddlehurst Limited | Health & social care | 2021 |
| Samava Ventures Ltd | Professional & scientific | 2004 |
| Samuel Services Limited | Information & communication | 2005 |
| Samuelsons & Company Limited | Professional & scientific | 2014 |
| Scandinavian Ocean Minerals Ltd | Financial services | 2026 |
| Serviced Office Solutions Limited | | 2011 |
| SFZ Hussain Limited | Health & social care | 2016 |
| Sharavale Limited | Health & social care | 2021 |
| Shuffleuff Productions Limited | Information & communication | 2018 |
| Simolar Konsult UK Limited | Wholesale & retail | 2011 |
| Sion Dewsbury Limited | Professional & scientific | 2026 |