| Harver Properties Limited | Real estate | 2024 |
| Hawke House Limited | Wholesale & retail | 2004 |
| Hedge END Golf Centre Limited | Extraterritorial | 2003 |
| Highbury Cafe Limited | Hospitality | 2015 |
| Highland Place RTM Company Limited | Households | 2023 |
| HST IT Limited | Information & communication | 2014 |
| I Love Dust Limited | Administrative & support | 2003 |
| Istrago Limited | Real estate | 2015 |
| J Hayter Smile Studio Limited | Manufacturing | 2017 |
| Jackson & Green Accountants Limited | Professional & scientific | 2016 |
| Jamela&Sisters Ltd | Health & social care | 2010 |
| James Blake Audit Limited | Professional & scientific | 2016 |
| Jellibert Properties Ltd | Real estate | 2025 |
| Jimrose (Portsmouth) Limited | Other services | 2020 |
| JNR Precision Engineering Ltd | Manufacturing | 2021 |
| JOB to Career Ltd | Administrative & support | 2021 |
| K3 Motorbike Parts Ltd | Wholesale & retail | 2021 |
| Kepler Construction Ltd | Construction | 2023 |
| KH Psychotherapy Ltd | Health & social care | 2021 |
| Kingfisher Hotel Group Ltd | Construction | 2026 |
| Kingfisher Organisation Ltd | Real estate | 2020 |
| Kissell Ltd | Arts & recreation | 2025 |
| KPM Brickwork Limited | Construction | 2008 |
| L W & T Engineering (UK) Limited | Manufacturing | 2007 |
| L. & V. Verrecchia & Sons Limited | Real estate | 1963 |
| L.P.H. (Investments) Limited | Real estate | 1962 |
| Lennox Landguard Ltd | Real estate | 2021 |
| Lennox Landguard Property Management Ltd | Real estate | 2022 |
| Leppard Limited | Information & communication | 2013 |
| Liney Group Limited | Financial services | 2025 |
| Lionshead Limited | Professional & scientific | 2008 |
| LV Rehabilitation Limited | Health & social care | 2019 |
| M and F Air Conditioning Ltd | Construction | 2009 |
| Made by Leon Limited | Information & communication | 2017 |
| Main FIX Group Ltd | Financial services | 2026 |
| Main FIX Interiors Ltd | Construction | 2019 |
| Mainfix Properties Ltd | Real estate | 2024 |
| Maldestra Limited | Construction | 2014 |
| Mcandrew Martin Limited | Professional & scientific | 2009 |
| MCI Tours Ltd | Administrative & support | 2000 |
| MDM Motorsport Ltd | Arts & recreation | 2025 |
| Meadows Contracting & Building Limited | Construction | 2023 |
| Meadows Contracting Services Ltd | Construction | 2017 |
| Medical PA Ltd | Administrative & support | 2021 |
| Mercx Limited | Information & communication | 2007 |
| Miles Better Media Ltd | Information & communication | 2020 |
| Mjmmanagementsolutions Limited | Information & communication | 2017 |
| MK Mobile Car Care Limited | Wholesale & retail | 2015 |
| Mojox Systems Limited | Information & communication | 2009 |
| Moore Construction (Southern) Limited | Construction | 2010 |
| Moore Property Maintenance Limited | Construction | 2003 |
| Motorhome Camp Limited | Wholesale & retail | 2018 |
| My Business Communications Limited | Information & communication | 2015 |
| N J Builders Limited | Construction | 2003 |
| Natural Choice Wood Floors Limited | Construction | 2001 |
| Netcomm Ltd | Construction | 2021 |
| Next Floor Limited | Wholesale & retail | 2008 |
| NHW Associates Limited | Administrative & support | 2012 |
| NJR Fire Protection Ltd | Construction | 2025 |
| NJR Group Southern Ltd | Financial services | 2025 |
| NJR Interior Systems Ltd | Construction | 2016 |
| Nudles Portsmouth Limited | Hospitality | 2016 |
| NVR Psychology Ltd | Professional & scientific | 2024 |
| Otter Labs Ltd | Information & communication | 2022 |
| Otterbourne Car Co Limited | Wholesale & retail | 2021 |
| Paintgard Limited | Wholesale & retail | 2007 |
| PAX Motors Ltd | Wholesale & retail | 2025 |
| Paxtons Property Services Ltd | Administrative & support | 2025 |
| Performance Design & Construction Ltd | Construction | 2025 |
| Portchester Community Centre Limited | Real estate | 2012 |
| Portsdown Masonic Hall Company Limited | Construction | 1947 |
| Portsmouth Rail Engineering Services Ltd | Administrative & support | 2018 |
| Premium Finish Plastering Ltd | Construction | 2022 |
| Prime Design Studio Ltd | Professional & scientific | 2025 |
| Purnama Jaya Ltd | Health & social care | 2026 |
| Puttman Ltd | Information & communication | 2024 |
| R M J Food Services Limited | Hospitality | 2017 |
| RBS Marine Limited | Wholesale & retail | 2012 |
| Rccg (Overseas) Limited | Extraterritorial | 2004 |
| Rccg (UK) Limited | Professional & scientific | 2004 |
| Rccg Holdings Limited | Extraterritorial | 2004 |
| RCE MOT & Service Centre Ltd | Wholesale & retail | 2021 |
| Remote Business (Holdings) Ltd | Professional & scientific | 2024 |
| Residence Direct Limited | Real estate | 2024 |
| RH Technical Services Limited | Administrative & support | 2017 |
| RJ Group Holdings Limited | Construction | 2019 |
| RJT Networks Limited | Construction | 2016 |
| Robins Trading Capital Ltd | Financial services | 2025 |
| Romsey Rugby Club Ltd | Arts & recreation | 2015 |
| RS Cosworth Breakers Ltd | Wholesale & retail | 2016 |
| RT Software Sports Ltd | Information & communication | 2021 |
| RVG Distribution Limited | Wholesale & retail | 2015 |
| S & L Morgan Investments Ltd | Real estate | 2016 |
| S Collins Podiatry Services Limited | Health & social care | 2012 |
| Scintillare Limited | Administrative & support | 2023 |
| Selectboard Company Limited | Other services | 1992 |
| Session Event Hire Limited | Administrative & support | 2021 |
| Shane Marriott Construction Ltd | Construction | 2024 |
| Shire Property Development Ltd | Real estate | 2015 |
| Simer Environmental Services Limited | Construction | 1977 |