| Mukisa Coffee CIC | Manufacturing | 2022 |
| Multi Feeds Ltd | Information & communication | 2018 |
| Multiple Electrical Engineering Services Limited | Manufacturing | 2002 |
| Music & Movement Limited | Education | 2019 |
| Musical Kids Ltd | Education | 2021 |
| MVF Holdings Limited | Real estate | 2021 |
| MW Residential Limited | Construction | 2009 |
| My Cabin Limited | Construction | 2018 |
| My Italy Limited | Hospitality | 2025 |
| My Laboratory Ltd | Health & social care | 2024 |
| My Mind and ME Ltd | Health & social care | 2021 |
| Nandini Investments Limited | Real estate | 2018 |
| Naskad Construction Ltd | Construction | 2020 |
| Nava Property Ltd | Real estate | 2020 |
| Navarra Property Management Ltd | Real estate | 2018 |
| Nazz Electrical Ltd | Construction | 2025 |
| Ncms Consulting Limited | Extraterritorial | 2024 |
| Neelkanth Varni Ltd | Administrative & support | 2024 |
| Nelson Homes Limited | Real estate | 2020 |
| Nelson Land Limited | Construction | 2004 |
| Nelson New Homes Limited | Construction | 2018 |
| Nelson Securities Limited | Real estate | 2004 |
| Nest & Roots Ltd | Real estate | 2022 |
| Nettelics Limited | Extraterritorial | 2006 |
| Newlands (Tadworth) Management Company Limited | Households | 2003 |
| Next Generation Designs Ltd | Professional & scientific | 2023 |
| Next Level Fitness Centre Ltd | Arts & recreation | 2021 |
| Night Nannies Hertfordshire and Buckinghamshire Ltd | Administrative & support | 2016 |
| NIL Return Ltd | Professional & scientific | 2026 |
| Nityug UK Ltd | Wholesale & retail | 2012 |
| NO.13 Cafe Ltd | Hospitality | 2026 |
| Nork Developments Limited | Construction | 2012 |
| North Downs Chiro Health Ltd | Health & social care | 2014 |
| North Downs Wealth Management Ltd | Financial services | 2015 |
| Nurture to Bloom Limited | Health & social care | 2026 |
| Nutrex Pharma Ltd | Wholesale & retail | 2023 |
| O and F Sporting Limited | Wholesale & retail | 2018 |
| O&J Group Limited | Construction | 2026 |
| Oak and Flint Limited | Construction | 2026 |
| Oakbid Limited | Real estate | 1983 |
| Oaklands (the Avenue) Management Company Limited | Real estate | 2009 |
| Oakley Homes Limited | Real estate | 2010 |
| Odisse Information Technologies Ltd | Information & communication | 2023 |
| Okidec LLP | | 2026 |
| Old Forge Developments Limited | Construction | 2019 |
| OLI Adams Performance Ltd | Professional & scientific | 2025 |
| Olivia Luxury Travel Ltd | Administrative & support | 2025 |
| Ollie Pickett Limited | Information & communication | 2019 |
| ON Top Builders Ltd | Construction | 2021 |
| ON Top Lofts Ltd | Other services | 2016 |
| ONE4ALL Pmca | Arts & recreation | 2015 |
| Onyx Procurement Ltd | Professional & scientific | 2025 |
| Orleans Ltd | Construction | 2023 |
| Oscars Venture Limited | Arts & recreation | 2025 |
| Over the Ridge Ltd | Construction | 2019 |
| Owlerton Limited | Information & communication | 2011 |
| Ownclear Property Management Limited | Real estate | 1996 |
| P G Searle Services Limited | Other services | 2017 |
| P&P Deliveries Ltd | Transport & logistics | 2023 |
| P.W. Industrial Services Limited | Manufacturing | 1990 |
| Pain Consult Limited | Health & social care | 2024 |
| Palmers of London Ltd | Administrative & support | 2019 |
| Pandasang Limited | Real estate | 2018 |
| Paperwork Art Design Ltd | Manufacturing | 2020 |
| Paradis Training Ltd | Education | 2021 |
| Parisa Training Ltd | Education | 2021 |
| Parts United Ltd | Households | 2025 |
| Passport to the Past Limited | Administrative & support | 2013 |
| Pastino Ltd | Hospitality | 2023 |
| Pavan Consultancy Ltd | Information & communication | 2015 |
| PDT Consultancy Ltd | Administrative & support | 2024 |
| Peak-Pro Ltd | Arts & recreation | 2020 |
| Pearson's Estate Planning Ltd | Financial services | 2019 |
| Peers Consulting Group Ltd | Professional & scientific | 2025 |
| PEM Professionals (UK) Limited | Professional & scientific | 2019 |
| Pemberley Netherfield (Kingswood) Management Company Limited | Households | 2011 |
| PER Mutua Rehabilitation Ltd | Health & social care | 2020 |
| Perfectfit Furniture Installations Limited | Construction | 2026 |
| Peri Fish & Chip Limited | Hospitality | 2025 |
| Pests Away Ltd | Agriculture & fishing | 2017 |
| Peter's Park Lyonsdene Limited | Other services | 2006 |
| Peterflat Limited | Real estate | 1978 |
| Pets Like US Ltd | Wholesale & retail | 2013 |
| Phillips Brown Social Care Limited | Health & social care | 2015 |
| Phyllis Service Limited | Professional & scientific | 2022 |
| PI Express Ltd | Transport & logistics | 2023 |
| Piccolo Events Limited | Hospitality | 2016 |
| Pietrunti Financials Ltd | Financial services | 2025 |
| Pine Design Construction Limited | Construction | 2025 |
| Pinnacle Roofing Team Limited | Construction | 2025 |
| Pinnacle Social Care Assessments Ltd | Health & social care | 2026 |
| Pinpoint Carpentry & Construction Limited | Manufacturing | 2023 |
| Pioneer House International Ltd | Wholesale & retail | 2025 |
| Piper 2 Ltd | Professional & scientific | 2015 |
| Piph Consulting Ltd | Other services | 2025 |
| Pipsnet Limited | Education | 2012 |
| PIT Stop Ventures Ltd | Administrative & support | 2015 |
| Playmaker Academy Ltd | Arts & recreation | 2025 |
| Plumbit Solutions Limited | Construction | 2021 |
| Plumdoc Ltd | Construction | 2024 |