| Media Mantra Limited | Professional & scientific | 2011 |
| MEI MEI Productions Ltd | Administrative & support | 2025 |
| Menon Consulting Ltd | Information & communication | 2007 |
| MGM Living Ltd | Real estate | 2025 |
| MGM Psychology Ltd | Health & social care | 2016 |
| MH Educational Ltd | Education | 2017 |
| Michelsen Family Limited | Professional & scientific | 2024 |
| Miljö Digital Ltd | Information & communication | 2015 |
| Milners Group Limited | Financial services | 2026 |
| Milners Group Properties Ltd | Real estate | 2024 |
| Mini Formula 1 Limited | Arts & recreation | 2002 |
| Mjei Ltd | Construction | 2012 |
| MJM Housekeeping Ltd | Administrative & support | 2018 |
| MK4 Resale Ltd | Information & communication | 2021 |
| Mnovate Ltd | Information & communication | 2020 |
| Modular Energy Solutions Limited | Construction | 2024 |
| Monique Blair Ltd | Health & social care | 2018 |
| Morden Grange SIX Limited | Households | 2017 |
| Mosaic Executive Coaching Limited | Health & social care | 2022 |
| Mountain ASH Portfolio Limited | Professional & scientific | 2007 |
| MP Sure Ltd | Extraterritorial | 2024 |
| Mural Republic Limited | Arts & recreation | 2020 |
| My Probate Ltd | Professional & scientific | 2021 |
| My Property Consultant Limited | Real estate | 2014 |
| Natasha Thompson PT Ltd | Real estate | 2024 |
| Natural Finance Limited | Information & communication | 2008 |
| Natural Way Limited | Manufacturing | 1997 |
| Nava Thai Ltd | Hospitality | 2019 |
| NCM Healthcare Services Ltd | Health & social care | 2015 |
| Neil Vincent Design Ltd | Other services | 2012 |
| Nesshin Games Ltd | Manufacturing | 2023 |
| Newlands FM Ltd | Professional & scientific | 2026 |
| NG MAN Sun Orthopaedics Ltd | Health & social care | 2024 |
| Nicholas Jones Advisory Ltd | Professional & scientific | 2026 |
| Nini-Hi Caravans Limited | Households | 1958 |
| Ninth Dimension Copy Ltd | Professional & scientific | 2023 |
| NJD Brickwork Contractors Limited | Administrative & support | 2004 |
| NNJ Ltd | Professional & scientific | 2012 |
| Noah Pro Ltd | Professional & scientific | 2025 |
| Nomis Creative Limited | Professional & scientific | 2013 |
| Noops Nutrition Ltd | Wholesale & retail | 2023 |
| Normanhurst Court (Freehold) Ltd. | Extraterritorial | 2009 |
| Norsdon Limited | Construction | 2009 |
| Nova Nexus Academy Ltd | Arts & recreation | 2024 |
| Nuleaf Designs Limited | Professional & scientific | 2025 |
| Oakfield Care (Ashtead) Ltd | Health & social care | 2016 |
| Oakhill Creative Ltd | Professional & scientific | 2022 |
| Oaklands Westhumble Ltd | Construction | 2022 |
| OFFTHESHELF123 Ltd | Extraterritorial | 2021 |
| Okya Design Ltd | Professional & scientific | 2026 |
| Old Freemen's Limited | Other services | 2022 |
| Old Mill Estates Limited | Real estate | 2004 |
| Olfactory Limited | Extraterritorial | 2013 |
| Omni Property Solutions Ltd | Construction | 2018 |
| Omveo Ltd | Information & communication | 2025 |
| ONA Connect Ltd | Information & communication | 2025 |
| One SIX Two Limited | Information & communication | 2021 |
| Onyx AI Limited | Professional & scientific | 2020 |
| Osbourne Links Ltd | Other services | 2021 |
| Packman Properties Limited | Households | 2024 |
| Pakio Ltd | Wholesale & retail | 2022 |
| Panache Professional Solutions Limited | Administrative & support | 2000 |
| Paper Stacked Limited | Extraterritorial | 2014 |
| Park Lane Advisors Limited | Professional & scientific | 2021 |
| Parq Ltd | Information & communication | 2019 |
| Pastafont (Music) Limited | Manufacturing | 1981 |
| Paterre Limited | Wholesale & retail | 2023 |
| Paul's Place Management Company Limited | Administrative & support | 1996 |
| PAW Investments Limited | Financial services | 1999 |
| Pcddesign Limited | Information & communication | 2007 |
| Pedal Active Ltd | Arts & recreation | 2015 |
| Pegasus Project Services Ltd | Information & communication | 2026 |
| Pelham Planning Associates Limited | Professional & scientific | 2008 |
| Penningtons Security Group Limited | Administrative & support | 2025 |
| Pharoah Investments Ltd | Extraterritorial | 2020 |
| Phoenix Consulting Ltd | Information & communication | 2024 |
| Pickup Advisory Limited | Professional & scientific | 2026 |
| Pigbears Limited | Professional & scientific | 2024 |
| Pita Adventures Ltd | Information & communication | 2022 |
| PJ Installations (Southern) Limited | Construction | 2006 |
| PKB Associates UK Limited | Wholesale & retail | 2025 |
| Playball SSC Ltd | Education | 2025 |
| Poppy Belle Limited | Information & communication | 2014 |
| Portland Squires Limited | Professional & scientific | 2002 |
| Practical Computer Solutions Limited | Professional & scientific | 1993 |
| Pre-Hospital Medical Services Limited | Health & social care | 2014 |
| Precision EYE Centre Limited | Health & social care | 2026 |
| Primal Consulting Services Ltd | Professional & scientific | 2010 |
| Priory Advisors Ltd | Administrative & support | 2019 |
| Procal Limited | Professional & scientific | 1992 |
| Procurement Advantage Limited | Administrative & support | 2020 |
| Profile (Services) Limited | Administrative & support | 2010 |
| Progorex Limited | Administrative & support | 2004 |
| Project Aberdeen Holdings Limited | Financial services | 2020 |
| Project Management Sciences Limited | Information & communication | 1988 |
| PRW UK Holdings Ltd | Extraterritorial | 2025 |
| PS Experts Ltd | Construction | 2003 |
| Pure Pamper Ltd | Other services | 2025 |
| Purple Gurl Consulting Limited | Professional & scientific | 2023 |
| Purple Ufos Ltd | Professional & scientific | 2019 |