| Mangoland Holdings Ltd | Administrative & support | 2023 |
| Marissa Conway Consulting Ltd | Professional & scientific | 2022 |
| Mark B Limited | Professional & scientific | 2010 |
| Mark Bell Design Ltd | Professional & scientific | 2013 |
| Mark Thomson Coaching Limited | Other services | 2023 |
| Marler Properties (Hampton) Limited | Professional & scientific | 1969 |
| Martello Court (Folkestone) Management Company Limited | Real estate | 2023 |
| Martin Abbott Engineering Limited | Manufacturing | 2002 |
| Martlet Holdings Ltd | Real estate | 2018 |
| Mastercraft Roofing Limited | Construction | 2003 |
| Matahari 306 Limited | Extraterritorial | 1990 |
| Mathon Lodge RTM Company Limited | Households | 2024 |
| Mayfair (TW5) RTM Company Limited | Households | 2024 |
| Mayfield Technical Services Limited | Professional & scientific | 2013 |
| Meadows END Management Company Limited | Real estate | 1998 |
| Medi-Klenz Ltd | Administrative & support | 2016 |
| Media Outlet Direct Limited | Information & communication | 2021 |
| Merrythought RTM Company Limited | Households | 2026 |
| Metable Limited | Information & communication | 2013 |
| Meteor Fireworks Limited | Arts & recreation | 2013 |
| Metis International Communications Limited | Professional & scientific | 2025 |
| MIC Healthcare Limited | Health & social care | 2012 |
| Mick Gould Commercials Limited | Wholesale & retail | 1999 |
| Mikk Valve Trading Limited | Professional & scientific | 2015 |
| Mirror Mirror Hairdressers Ltd | Other services | 2022 |
| Mitre Farm Limited | Wholesale & retail | 2017 |
| MN Chambers Ltd | Real estate | 2023 |
| Monotremous Ltd | Information & communication | 2025 |
| Montash Developments Limited | Construction | 2018 |
| Montash Estates Limited | Financial services | 2018 |
| Montash Properties Limited | Real estate | 1970 |
| Morris Minor Workshop Ltd | Wholesale & retail | 2026 |
| Mount ROW Partnership Limited | Administrative & support | 2020 |
| Mousehall Estate Ltd | Agriculture & fishing | 2018 |
| MPI Media Ltd | Information & communication | 2026 |
| Msds Holdings Limited | Financial services | 2023 |
| MSK Accounting Services Limited | Professional & scientific | 2013 |
| Musicarama Ltd | Arts & recreation | 2015 |
| My Mobile Locksmith Ltd | Other services | 2025 |
| Myskyns International Limited | Professional & scientific | 2004 |
| N F Groundwork & Landscaping Limited | Extraterritorial | 2003 |
| Napoleon House RTM Company Limited | Households | 2024 |
| Nature Matters CIC | Other services | 2024 |
| Nelson Mews RTM Company Limited | Households | 2024 |
| Nevalee Business Solutions Limited | Information & communication | 2012 |
| New Abode (London) Ltd | Real estate | 2015 |
| New Park Farm (Kent) Ltd | Wholesale & retail | 2012 |
| Newframe Glazing Specialists Ltd | Construction | 2022 |
| Nichola CT 1-4 RTM Company Limited | Households | 2026 |
| Nichole Farrow Limited | Professional & scientific | 2019 |
| NJT Support Limited | Administrative & support | 2014 |
| Nljt Properties Limited | Real estate | 2021 |
| Nmmc Holdings Limited | Professional & scientific | 2009 |
| Noahs Property Services Ltd | Construction | 2010 |
| Node Tax Ltd | Administrative & support | 2026 |
| Nomosunprotection Ltd | Manufacturing | 2025 |
| Norman Link Accountants Limited | Professional & scientific | 2026 |
| North Candle Co Limited | Wholesale & retail | 2021 |
| Northpoint Management Consultancy Limited | Professional & scientific | 2021 |
| Norwood Road RTM Company Limited | Households | 2024 |
| Note.Ate Limited | Information & communication | 2023 |
| Null Island Media Limited | Information & communication | 2020 |
| O.S.I. International Limited | Real estate | 1998 |
| Oakwood Coaching and Psychology Ltd | Education | 2024 |
| Oakwood HR Limited | Administrative & support | 2024 |
| Occam Financial Technology Limited | Information & communication | 2013 |
| Octophenia Ltd | Information & communication | 2025 |
| Off-Highway Research Limited | Information & communication | 1992 |
| OK Hydraulics Limited | Wholesale & retail | 2024 |
| Old Hazelwood (Ticehurst) Residents Limited | Other services | 2009 |
| Olivers Heights RTM Company Limited | Households | 2024 |
| One Step Education Ltd | Education | 2021 |
| Only Group UK Ltd | Wholesale & retail | 2019 |
| ORC Consultants Limited | Professional & scientific | 2015 |
| P J Delaney Limited | Professional & scientific | 2010 |
| P.B Mobile Car Mechanic Ltd | Wholesale & retail | 2026 |
| Pangea Imports Limited | Wholesale & retail | 2016 |
| Paraflow Limited | Other services | 2024 |
| Park Home Assist Insurance Services Limited | Financial services | 2006 |
| Park Home Insurance Services Limited | Financial services | 1994 |
| Parsonage Farm Day Care Nursery Limited | Education | 2004 |
| Paturages Paradis Limited | Wholesale & retail | 2016 |
| Paul Golledge Consulting Ltd | Administrative & support | 2025 |
| Paul Hambly Limited | Health & social care | 2003 |
| PD Recruitment Solutions Limited | Administrative & support | 2008 |
| PDM Jointing Limited | Construction | 2011 |
| Peaches and Clementines Ltd | Hospitality | 2025 |
| Pearl a House RTM Company Limited | Households | 2025 |
| Pennywood Tours Ltd | Administrative & support | 2018 |
| Perfecting Wine Limited | Extraterritorial | 2025 |
| Photobanks Limited | Professional & scientific | 2011 |
| Planning Inspiration Ltd | Construction | 2023 |
| Pleasure by Design Limited | Professional & scientific | 2019 |
| Pomeroy Consultancy Ltd | Professional & scientific | 2021 |
| Popperty Ltd | Construction | 2015 |
| Portslade Panelworks Limited | Wholesale & retail | 2000 |
| Praefectus Ltd | Real estate | 2023 |
| Pragmatic Process Automation Ltd | Information & communication | 2018 |
| Precision Panelworks Limited | Wholesale & retail | 2023 |
| Prestige Electricals (UK) Limited | Construction | 1992 |