| New Forest Transition CIC | Other services | 2014 |
| New Forest Turf Supplies Limited | Agriculture & fishing | 2016 |
| New Forest Waste & Recycling Limited | Water & waste | 2019 |
| New Horizons EAL Community Interest Company | Health & social care | 2012 |
| Newbridge Computers Limited | Information & communication | 1988 |
| Newlands Manor Limited | Households | 1953 |
| Newlands Projects Limited | Real estate | 2019 |
| Newstead Estate & Letting Agents Ltd | Real estate | 2010 |
| Nexgen Forecasting Ltd | Professional & scientific | 2025 |
| Nexgen People Ltd | Administrative & support | 2025 |
| Nexus Bricks Limited | Wholesale & retail | 2019 |
| NFC Automotive Ltd | Wholesale & retail | 2025 |
| NFC Projects Ltd | Manufacturing | 2024 |
| Nfeng Ltd | Administrative & support | 2024 |
| Nfss (NM4) Ltd | Real estate | 2020 |
| Ngag Biotech Ltd | Agriculture & fishing | 2025 |
| Nick COX Yacht Chandler Limited | Wholesale & retail | 1985 |
| Nick Patrick Productions Limited | Information & communication | 2017 |
| Nick Webb Ltd | Manufacturing | 2017 |
| NIK Wheelhouse Limited | Real estate | 1995 |
| Nisnet Limited | Information & communication | 2020 |
| Nivison Accounting Limited | Professional & scientific | 2007 |
| NJ Professional Solutions Limited | Information & communication | 2006 |
| NLH Environmental Limited | Professional & scientific | 2018 |
| Noah Valentine Antiques Limited | Wholesale & retail | 2018 |
| Nojour Limited | Wholesale & retail | 2025 |
| Nonartifice Ltd | Information & communication | 2025 |
| Nordlys Horizons Ltd | Professional & scientific | 2025 |
| Norley Holdings Limited | Financial services | 2018 |
| North Point Structures (Commercial) Ltd | Professional & scientific | 2023 |
| North Point Structures (Residential) Ltd | Professional & scientific | 2023 |
| North Star Management Limited | Professional & scientific | 2019 |
| NORTH2NORTH Limited | Information & communication | 2009 |
| Northwood Osborne (Holdings) Ltd | Hospitality | 2021 |
| Norton Technology Services Limited | Information & communication | 2025 |
| Noss Mayo Estate Services Limited | Real estate | 1995 |
| Notting Hill Rigging Ltd | Professional & scientific | 2022 |
| Nourish Parents Limited | Administrative & support | 2019 |
| Novacool Solutions Ltd | Wholesale & retail | 2025 |
| Noyer Vintners Limited | Wholesale & retail | 2022 |
| NPD Imports Limited | Administrative & support | 2008 |
| NUA Architecture and Interior Design Ltd | Professional & scientific | 2025 |
| Nueva Finance and Equity Consultants Ltd | Professional & scientific | 2013 |
| Nvirowell Limited | Professional & scientific | 2024 |
| Oakhaven Care Limited | Health & social care | 2013 |
| Oakhaven Lottery Company Limited | Arts & recreation | 1997 |
| Oakleigh Homes Southern Ltd | Construction | 2022 |
| OBF Property Ltd | Real estate | 2021 |
| Ocean Point (Milford on Sea) Management Company Limited | Households | 2008 |
| Oceanview Developments Limited | Construction | 2002 |
| Octagon Land Ltd | Construction | 2025 |
| Odic Security Ltd | Construction | 2025 |
| Offset Energy Ltd | Professional & scientific | 2011 |
| Offshore Lighting Limited | Construction | 1986 |
| Old Forge Court Management Company Limited | Real estate | 2008 |
| Old Orchards (Lymington) Management Limited | Professional & scientific | 2003 |
| OM Fleet Management Ltd | Professional & scientific | 2025 |
| Open Leadership Consulting Ltd | Extraterritorial | 2014 |
| Openair Labs Limited | Professional & scientific | 2018 |
| Operation Health Ltd | Health & social care | 2026 |
| Opposite Tack Ltd | Information & communication | 2013 |
| Optima Projects Ltd | Professional & scientific | 2006 |
| Optima Yachts Ltd | Manufacturing | 2023 |
| Organic Care Systems Limited | Extraterritorial | 2012 |
| Organic Colour Systems Limited | Wholesale & retail | 1994 |
| Organise Events Ltd | Administrative & support | 2014 |
| Osam Global Ltd | Wholesale & retail | 2025 |
| Outside Broadcast Sound Productions | Arts & recreation | 2014 |
| OVD1 Limited | Real estate | 2023 |
| OVD2 Limited | Real estate | 2025 |
| Ovenden Media Ltd | Information & communication | 2022 |
| Owen Haisell Services Ltd | Manufacturing | 2013 |
| Oyster Engineering Limited | Professional & scientific | 2022 |
| P & V Services Ltd | Education | 2019 |
| P and D Building Limited | Construction | 2015 |
| P C Harding Plumbing and Heating Ltd | Construction | 2003 |
| P J Doody Limited | Construction | 2025 |
| P J Dunford Limited | Extraterritorial | 1988 |
| P. D. Coombs Limited | Construction | 2004 |
| P. N. W. Properties Limited | Real estate | 1985 |
| P.L.H. Farriers Limited | Other services | 2004 |
| P.N.W. Design Limited | Professional & scientific | 1985 |
| PAD Studio Ltd | Professional & scientific | 2013 |
| Paddle Steamer Kingswear Castle Trust Limited | Arts & recreation | 1963 |
| Paddock Gardens (Lymington) Management Limited | Households | 1986 |
| PAE Projects Ltd | Professional & scientific | 2023 |
| Pajeroshop Ltd | Wholesale & retail | 2010 |
| Papertrain Studio Limited | Professional & scientific | 2014 |
| Paragon Marine Ltd | Professional & scientific | 2019 |
| Park Court (Milford-On-Sea) Management Limited | Households | 1981 |
| Park HR Recruitment Ltd | Administrative & support | 2017 |
| Parker Anderson Development Holdings Limited | Construction | 2016 |
| Parker Anderson Limited | Wholesale & retail | 1982 |
| Parker-Sterling Ltd | Construction | 2021 |
| Participation Limited | Professional & scientific | 1996 |
| Partridge Associates UK Limited | Administrative & support | 2003 |
| Paul Bacon Engineering Services Limited | Professional & scientific | 2012 |
| Paul Russell Plastering Limited | Construction | 2009 |
| Paul Sheffield Limited | Construction | 2005 |
| PBS Pools Ltd | Construction | 1994 |