| Nazm Global Ltd | Professional & scientific | 2017 |
| NBS Food Trading Ltd | Hospitality | 2015 |
| NDS Plumbing & Drainage Ltd | Construction | 2023 |
| Netconnective Ltd | Information & communication | 2014 |
| Netune Atlantic Europe Limited | Professional & scientific | 2017 |
| Networking Naturally Ltd | Extraterritorial | 2010 |
| Neura Energy Limited | Information & communication | 2023 |
| Neuranest Care Ltd | Health & social care | 2026 |
| New ERA Cuisine Limited | Hospitality | 2023 |
| New Life Wellness Limited | Arts & recreation | 2021 |
| Newbury Cateting Ltd | Hospitality | 2025 |
| Newcastle Bingo Ltd | Administrative & support | 2009 |
| Newsteer Ltd | Real estate | 2019 |
| Newtech Southern Limited | Professional & scientific | 2002 |
| Newtex Pizza Limited | Hospitality | 2008 |
| Nexus Builds (Fleet) Limited | Construction | 2024 |
| Nexus Electrical & Climate Ltd | Construction | 2025 |
| NH Electrical Services Hampshire Limited | Construction | 2014 |
| Niche Networking Ltd | Administrative & support | 2026 |
| Niche Sales and Marketing Solutions Limited | Wholesale & retail | 2011 |
| Nick BEE Plastering and Rendering Contractors Ltd | Construction | 2025 |
| NNW Consulting Limited | Administrative & support | 2016 |
| NO Grow Artificial Grass Limited | Administrative & support | 2020 |
| NO Limits Marketing Limited | Professional & scientific | 1998 |
| NO. 17 Moniques Limited | Other services | 2012 |
| Noble Promotions Limited | Arts & recreation | 2007 |
| Noisy Design Ltd | Professional & scientific | 2022 |
| Noivo Accountancy Ltd | Professional & scientific | 2024 |
| Nolan Business Solutions Public Limited Company | Information & communication | 1988 |
| North Hampshire Window Cleaning Limited | Administrative & support | 2024 |
| North Hants Golf Club Limited | Arts & recreation | 2014 |
| North Hants Trust Company Limited | Arts & recreation | 1925 |
| North Lane (Aldershot) Management Company Limited | Households | 2004 |
| North Star CXO Advisory Ltd | Information & communication | 2003 |
| North Star Saas Ventures Ltd | Professional & scientific | 2024 |
| Northrule Ltd | Professional & scientific | 2021 |
| Novabell Limited | Construction | 2002 |
| Nowhere Artist Collective Limited | Arts & recreation | 2023 |
| NRG Creative Limited | Information & communication | 2024 |
| NRG Digital Creative Limited | Information & communication | 2012 |
| NRG Global Limited | Information & communication | 2024 |
| NRG Studios Limited | Information & communication | 2024 |
| NRL Gates Limited | Construction | 2017 |
| Number 13 Consulting Ltd | Professional & scientific | 2021 |
| Nuvi Media Ltd | Construction | 2022 |
| Nuvizo Ltd | Information & communication | 2024 |
| Nxgen Pro Ltd | Arts & recreation | 2024 |
| Nyex Ltd | Information & communication | 2025 |
| NYM Properties Limited | Real estate | 2016 |
| O.G. Logistics Limited | Professional & scientific | 2004 |
| Oakcrest Property Limited | Real estate | 2025 |
| Oakley Landscaping Supplies Ltd | Wholesale & retail | 2023 |
| Occassio Ltd | Professional & scientific | 2022 |
| Ockley Park (Hassocks) (Block E) Residents Management Company Limited | Households | 2023 |
| Ockley Park (Hassocks) (Blocks a & B) Residents Management Company Limited | Households | 2023 |
| Ockley Park (Hassocks) Residents Management Company Ltd | Households | 2022 |
| Ocufresh Commerce LLP | | 2022 |
| OEG Holdings Limited | Financial services | 2024 |
| OFF Beta Tech Ltd | Wholesale & retail | 2025 |
| Office Fit OUT Ltd | Construction | 2023 |
| Ofresh Marketing Ltd | Information & communication | 2024 |
| OGP Limited | Professional & scientific | 2006 |
| Old Dairy Close (Fleet) RTM Company Limited | Households | 2011 |
| Omega Computing Limited | Professional & scientific | 1998 |
| Omnia Smart Technologies Limited | Information & communication | 2013 |
| Omnitas Consulting Ltd | Information & communication | 2022 |
| One Dream Ecommerce Limited | Wholesale & retail | 2019 |
| Onengcom Limited | Wholesale & retail | 2018 |
| Onetwentyseven Ltd | Financial services | 2012 |
| Only Bricks and Water Limited | Real estate | 2023 |
| Only K9 Ltd | Other services | 2024 |
| Onmt Redhill Ltd | Transport & logistics | 2026 |
| Operatix Limited | Administrative & support | 2012 |
| Opsgenix Technology Ltd | Information & communication | 2022 |
| Optimal Ebit Ltd | Professional & scientific | 2014 |
| Orchard Brook Residents Company Limited | Households | 1992 |
| Orchard Priory Apartments Limited | Households | 1999 |
| Orchid Wellness Limited | Health & social care | 2022 |
| Oriental 777 Ltd | Real estate | 2025 |
| Orion International Consulting Ltd | Professional & scientific | 2021 |
| Orvalsoft Group Limited | Information & communication | 2017 |
| Orvis Consulting Ltd | Professional & scientific | 2009 |
| Osborne Residence Limited | Hospitality | 2014 |
| Oscar Construction & Civil Engineering Ltd | Construction | 2021 |
| Osprey Avenue (Bracknell) RTM Company Ltd | Households | 2019 |
| OSS Consulting Ltd | Professional & scientific | 2025 |
| OUR Style Limited | Wholesale & retail | 2001 |
| Outdoor Nation Online Ltd | Information & communication | 2018 |
| Outershade Ltd | Wholesale & retail | 2021 |
| Oxford Padel Limited | Arts & recreation | 2025 |
| Oyster Consulting Limited | Real estate | 1993 |
| Oyster Portfolio Limited | Real estate | 2006 |
| P G Electrical Contracting Ltd | Construction | 2023 |
| P M Builders Limited | Administrative & support | 2001 |
| P R Fleet Limited | Hospitality | 2021 |
| P&L (Hants) Ltd | Real estate | 2026 |
| PA Training and Nutrition Ltd | Arts & recreation | 2021 |
| PAG Merch Ltd | Wholesale & retail | 2024 |
| Page Temple Payne Limited | Administrative & support | 2000 |
| Paige Law Limited | Professional & scientific | 2022 |