| Formyson Properties Limited | Real estate | 1997 |
| Forsyth Home Improvement's Ltd | Construction | 2023 |
| Fortis Fire Safety Limited | Professional & scientific | 2018 |
| Fortunateness Ltd | Wholesale & retail | 2017 |
| Forza Mobile Mechanic Ltd | Wholesale & retail | 2018 |
| Fountain Home Estates Ltd | Real estate | 2024 |
| Four Moore Golf Ltd | Arts & recreation | 2023 |
| Fournationsvitality Ltd | Manufacturing | 2026 |
| Fpandb Ltd | Professional & scientific | 2025 |
| Franc Car Wash Ltd | Other services | 2019 |
| Fratelli Beretta UK Limited | Other services | 2000 |
| Freddie Baverstock Ltd | Manufacturing | 2026 |
| Fresh Cook Catering Ltd | Hospitality | 2024 |
| Fresh Escapes With Shalewa Ltd | Administrative & support | 2024 |
| Fresha Souls Ltd | Wholesale & retail | 2026 |
| Frexim Limited | Wholesale & retail | 2025 |
| Freya Rose Limited | Manufacturing | 2010 |
| Frith Park Ltd | Construction | 2024 |
| Frozen Digital Limited | Professional & scientific | 2025 |
| Fryer & Gildone Limited | Real estate | 2019 |
| FS UK Accountants Ltd | Wholesale & retail | 2026 |
| FU GUI Yuan Trading Limited | Wholesale & retail | 2024 |
| Fuei Limited | Hospitality | 2017 |
| Fuizion Freeze Dried Food Limited | Manufacturing | 2009 |
| Funany Ventures Limited | Wholesale & retail | 2025 |
| Future PR Ltd | Professional & scientific | 2016 |
| FW Property Investments Ltd | Real estate | 2024 |
| FYM Group Ltd | Financial services | 2022 |
| FYM Invest Ltd | Real estate | 2023 |
| FZ Pulse Limited | Wholesale & retail | 2026 |
| G Foran Ltd | Construction | 2018 |
| G&E Group Ltd | Hospitality | 2020 |
| G&K Holdings Limited | Administrative & support | 2016 |
| G.J. Flewin Associates Limited | Professional & scientific | 1987 |
| Gabe Sprint Ltd | Transport & logistics | 2020 |
| GAD Construction Portsmouth Ltd | Construction | 2026 |
| Galbi BBQ Ltd | Hospitality | 2022 |
| Galette Wines Limited | Wholesale & retail | 2012 |
| Gallacher Procurement Consultants Ltd | Professional & scientific | 2022 |
| Galley-La Company Ltd | Wholesale & retail | 2024 |
| Games Wharf Limited | Professional & scientific | 2010 |
| Games Wharf Southsea LLP | | 2020 |
| Garbo's Hair Southsea Ltd | Administrative & support | 2024 |
| Garbo's SS (Portsmouth) Ltd | Wholesale & retail | 2025 |
| Gasworks Maintenance Ltd | Construction | 2015 |
| Gattica Associates Limited | Professional & scientific | 2012 |
| Gattica Limited | Professional & scientific | 2004 |
| GB 2002 Limited | Construction | 2017 |
| GB Meraki AIM Limited | Extraterritorial | 2019 |
| GB Meraki Holdings Limited | Financial services | 2019 |
| GB Solent Auto Ltd | Wholesale & retail | 2026 |
| GC Electrical Solutions Ltd | Construction | 2024 |
| GC Invitational Ltd | Arts & recreation | 2025 |
| Gcap Services Limited | Professional & scientific | 2017 |
| Gcpm Property Maintenance Ltd | Administrative & support | 2022 |
| GD3 Property Ltd | Real estate | 2011 |
| GDM Plumbing & Heating Services Ltd | Construction | 2020 |
| GE Accountancy Solutions Ltd | Professional & scientific | 2025 |
| Gemba Ltd | Professional & scientific | 2012 |
| Geneva Property Corporation Limited | Households | 1992 |
| George Crick Ltd | Information & communication | 2014 |
| Georgina Chambers Studios Ltd | Other services | 2017 |
| Georgina Chambers Wedding Makeup Ltd | Other services | 2019 |
| GET Staff Temps Ltd | Administrative & support | 2013 |
| GET UP the Load Limited | Water & waste | 2025 |
| Geteck UK Limited | Financial services | 2012 |
| GGB Services Ltd | Professional & scientific | 2024 |
| Ghaedi Transport Services Ltd | Transport & logistics | 2025 |
| Ghazali Education Trust (UK) Limited | Education | 2010 |
| Gibbs Marshall UK Ltd | Administrative & support | 2018 |
| Gift Ninja Ltd | Wholesale & retail | 2025 |
| Gilbert's Confectioners Limited | Wholesale & retail | 2019 |
| Gildone & Fryer Limited | Financial services | 2019 |
| GIN & Olive Southsea Limited | Hospitality | 2022 |
| GIN and Olive Bars and Restaurants Limited | Hospitality | 2016 |
| GIN and Olive Bars and Restaurants Southampton Limited | Hospitality | 2020 |
| Ginger Soft Limited | Real estate | 1996 |
| Gingham Fish Company Limited | Professional & scientific | 1998 |
| Gipsycastle Limited | Households | 1985 |
| Giuliad Ltd | Transport & logistics | 2022 |
| GKL Carpentry Limited | Manufacturing | 2018 |
| Glade Technology Ltd | Information & communication | 2022 |
| Glendower Apartments Freehold Limited | Households | 2015 |
| Glenleigh Court Limited | Hospitality | 2015 |
| Glenn Scholes Plumbing & Heating Ltd | Construction | 2025 |
| Glintc Limited | Wholesale & retail | 2025 |
| Global Manage Service Ltd | Real estate | 2025 |
| Globe Veterinary Services Ltd | Professional & scientific | 2015 |
| Glow & Go Cleaning Business Ltd | Administrative & support | 2024 |
| GLS RGN Ltd | Health & social care | 2019 |
| GMB Real Estate Ltd | Real estate | 2025 |
| GME Safety Limited | Wholesale & retail | 2025 |
| GMG Drive Ltd | Transport & logistics | 2025 |
| Gmll Ltd | Professional & scientific | 2015 |
| GMP General Maintenance Ltd | Construction | 2017 |
| Go Paddy Ltd | Wholesale & retail | 2022 |
| Go Tech Southsea Ltd | Wholesale & retail | 2020 |
| GOA Signature Limited | Wholesale & retail | 2026 |
| GOD IT Limited | Information & communication | 2015 |
| Golden Forest Ltd | Hospitality | 2024 |