| Maplewood Property Services Ltd | Real estate | 2021 |
| Marsh's Jewellery Limited | Wholesale & retail | 2025 |
| Martin Barker Electrical Limited | Construction | 2002 |
| Maxey Properties and Developments Ltd | Construction | 2021 |
| Mayberry Consulting Limited | Professional & scientific | 2021 |
| Mcstay Plumbing & Heating Ltd | Construction | 2016 |
| MD Legal Consulting Limited | Professional & scientific | 2015 |
| Meaden Management LLP | | 2022 |
| Mecanix Ltd | Administrative & support | 2008 |
| Meon Valley Services Limited | Agriculture & fishing | 2002 |
| Meqs Ltd | Professional & scientific | 2022 |
| Mias Consulting Limited | Information & communication | 1998 |
| Middleton-On-Sea Estate Limited | Real estate | 1946 |
| Mike Pritchard Motors Limited | Wholesale & retail | 2014 |
| Milbury Lettings Limited | Real estate | 2016 |
| Militant South Limited | Information & communication | 2008 |
| Minesweeper Business Solutions Limited | Professional & scientific | 2016 |
| MK Finman Ltd | Financial services | 2025 |
| Mlpc Parent Limited | Information & communication | 2008 |
| Mode 4 Projects and Technology Limited | Construction | 2015 |
| Moore Consultants (Salisbury) Ltd | Professional & scientific | 2024 |
| Morgan Contract Furniture Limited | Manufacturing | 1994 |
| Moss Reliance Ltd | Construction | 2023 |
| Mouland & Yates Limited | Wholesale & retail | 2012 |
| MRH Scaffolding Ltd | Construction | 2017 |
| MTB Business Services Limited | Construction | 2017 |
| MTB Lettings Limited | Real estate | 2021 |
| Mughal 42 Limited | Information & communication | 2025 |
| N G Emery Ltd | Manufacturing | 2008 |
| National Sporting Club (N.S.C) Limited | Extraterritorial | 2020 |
| Nature Barn Nursery Ltd | Health & social care | 2024 |
| Netcom Limited | Information & communication | 2008 |
| New Forest Financial Planning Limited | Professional & scientific | 2015 |
| New Forest Plastering and Rendering Limited | Construction | 2017 |
| Nicholas Clark Developments Limited | Construction | 2017 |
| Niners Basketball C.I.C. | Arts & recreation | 2025 |
| Nixon & Nixon (Plastics) Limited | Administrative & support | 2015 |
| NTX Limited | Professional & scientific | 2023 |
| Nyan Nyan Limited | Financial services | 2022 |
| O. Kinch Agricultural Contracting Ltd | Agriculture & fishing | 2017 |
| Oaklawn Developments Limited | Real estate | 1984 |
| Ocean Life Charter Ltd | Manufacturing | 2020 |
| Octa Finance Limited | Professional & scientific | 2024 |
| OHS Health Ltd | Financial services | 2016 |
| Old Forge Close RTM Company Limited | Households | 2026 |
| Opus Screenprint (1999) Limited | Manufacturing | 1998 |
| Oraibio Private Limited | Professional & scientific | 2021 |
| Orbit Business Management Limited | Information & communication | 2014 |
| Orion Acquisitions Ltd | Construction | 2015 |
| Oyster One Limited | Hospitality | 2022 |
| P&Cm (South) Ltd | Real estate | 2020 |
| P.T. Hunnisett Limited | Agriculture & fishing | 2014 |
| Panda's Paper Boutique Limited | Other services | 2023 |
| Pandek Ltd | Households | 2009 |
| Paper Boutique Limited | Other services | 2024 |
| Parallel Blue Ltd | Extraterritorial | 2018 |
| Park Home Services (UK) Ltd | Administrative & support | 2011 |
| Park Home Surveys Ltd | Professional & scientific | 2016 |
| Peach Commercial Consulting Limited | Professional & scientific | 2025 |
| Pegbox INT Ltd | Administrative & support | 2020 |
| Pegbox Limited | Administrative & support | 2015 |
| Peter Newton Limited | Construction | 2016 |
| Phil Knott Associates Ltd | Professional & scientific | 2019 |
| Piecaramba Events Limited | Professional & scientific | 2019 |
| Piecaramba Group Limited | Professional & scientific | 2019 |
| Piecaramba Manufacturing Limited | Manufacturing | 2019 |
| Piecaramba Southampton Limited | Hospitality | 2017 |
| Piecaramba Southsea Limited | Hospitality | 2024 |
| Piecaramba Winchester Limited | Wholesale & retail | 2015 |
| Pinnacle (Angelgate) Limited | Construction | 2014 |
| PIT Stop Food on the Go Limited | Hospitality | 2025 |
| Pitchside Productions Limited | Information & communication | 2010 |
| Pizza Sorrento Ltd | Hospitality | 2021 |
| Plant Exit Ltd | Other services | 2023 |
| Poolemead Accountants Limited | Professional & scientific | 2012 |
| Positive Ripples Limited | Professional & scientific | 2023 |
| Procedure and Data Solutions Ltd | Information & communication | 2003 |
| Pugilistic Club Limited | Arts & recreation | 2020 |
| Pulsar R&D Ltd | Extraterritorial | 2017 |
| Pure Brand Media Limited | Information & communication | 2006 |
| Purple DOT Property Limited | Real estate | 2018 |
| PW Tech Limited | Construction | 2017 |
| Quaystone Projects Holdings Limited | Construction | 2022 |
| Quaystone Projects Limited | Construction | 2016 |
| Quaystone Projects Small Works Limited | Construction | 2025 |
| R H Flooring Solutions Limited | Construction | 2019 |
| Rail & Property Management Limited | Construction | 2012 |
| RC Engineering Ltd | Professional & scientific | 2024 |
| RCH Estates Ltd | Real estate | 2015 |
| Rdse Services Limited | Information & communication | 2013 |
| Realm Consulting Solutions Ltd | Information & communication | 2010 |
| Recurring Results Limited | Information & communication | 2025 |
| Red Roof Marine Limited | Construction | 2016 |
| Redholt Limited | Professional & scientific | 2016 |
| Redholt Team Limited | Professional & scientific | 2019 |
| Reqiva Limited | Administrative & support | 2008 |
| RJS Cooling Limited | Manufacturing | 2006 |
| RKM Scaffolding Ltd | Construction | 2020 |
| ROB Large Investments Limited | Hospitality | 2020 |
| ROB Powter & Co Ltd | Real estate | 2001 |