| Fringe Business Solutions Limited | Professional & scientific | 2024 |
| FRM Hampshire Ltd | Education | 2026 |
| Front Line Genomics Holdings Limited | Financial services | 2022 |
| Front Line Genomics Limited | Administrative & support | 2016 |
| Front Street Consulting Ltd | Professional & scientific | 2019 |
| FRONTIER15 Limited | Professional & scientific | 2026 |
| Frontline Protection Systems Limited | Manufacturing | 2016 |
| Frooteli Ltd | Manufacturing | 2021 |
| Fryderyk Chopin Polish School in Southampton | Education | 2015 |
| FT Advisory Limited | Administrative & support | 2025 |
| FTL Thatching Limited | Construction | 2007 |
| Full Moon Productions Limited | Financial services | 2000 |
| Full Nine Solutions Limited | Information & communication | 2015 |
| Fuller Tree Services Ltd | Administrative & support | 2023 |
| Fuller's Garden Maintenance Ltd | Administrative & support | 2026 |
| Fullerton Place Residents Management Company Limited | Households | 2019 |
| Fully Engaged Ltd | Professional & scientific | 2013 |
| Fuori Limited | Information & communication | 2012 |
| Furlong Ground Rents Limited | Real estate | 2025 |
| Furniture Fables Limited | Extraterritorial | 2016 |
| Future Flooring Limited | Construction | 2013 |
| Future GOV Digital Ltd. | Information & communication | 2016 |
| Future State Group Holdings Limited | Financial services | 2024 |
| Future State Group Limited | Real estate | 2023 |
| FX Tennis Academy Ltd | Arts & recreation | 2018 |
| G & C Paramount Trade UK Ltd | Wholesale & retail | 2024 |
| G & E UK Properties Ltd | Real estate | 2021 |
| G C Estates Limited | Extraterritorial | 2011 |
| G Howells Marine Ltd | Manufacturing | 2024 |
| G J Howells Limited | Construction | 2014 |
| G TES Services Ltd | Construction | 2024 |
| G&S Supplier Ltd | Wholesale & retail | 2018 |
| G. Martinez & Sons Building Services Limited | Construction | 2023 |
| G.E Mechanical Limited | Wholesale & retail | 2025 |
| G.E Ventilation Limited | Wholesale & retail | 2024 |
| GA Partnership Limited | Professional & scientific | 2015 |
| Gabriel Archeng Ltd | Construction | 2014 |
| Gabriella Matassa Jewellery Limited | Manufacturing | 2023 |
| Gadd Osteopathy Ltd | Professional & scientific | 2022 |
| GADGETS4WINCHESTER Ltd | Wholesale & retail | 2020 |
| Gaew Aran Burapa Ltd | Hospitality | 2013 |
| Gail Dawe Limited | Other services | 2012 |
| Gale Strategies Ltd | Real estate | 2022 |
| Galeforce Haulage Ltd | Transport & logistics | 2026 |
| GALERY64 Ltd | Wholesale & retail | 2021 |
| Galinara Limited | Wholesale & retail | 2012 |
| Galleon Solutions Ltd | Information & communication | 1994 |
| Gallery Alpha LLP | | 2011 |
| Gallery Main I Limited | Administrative & support | 2013 |
| Galpin Benton Associates Limited | Real estate | 2018 |
| Galvani Project Management and Consulting Ltd | Wholesale & retail | 2023 |
| Galvin Hand Car Wash Ltd | Wholesale & retail | 2016 |
| Gamekeepers Goods Ltd | Agriculture & fishing | 2024 |
| Gamerpro Ltd | Arts & recreation | 2015 |
| Gamma Transport Limited | Construction | 2002 |
| Gandhi Winchester Limited | Hospitality | 2006 |
| Garcia Forner Consulting Ltd | Administrative & support | 2014 |
| Garratt Controls Limited | Professional & scientific | 2023 |
| Garrick Court (Wandsworth) Limited | Households | 1983 |
| Garrison Fencing Ltd | Construction | 2026 |
| Gate 27 UK Limited | Real estate | 2015 |
| Gate 29 Limited | Real estate | 2018 |
| GBC Building Contractors Ltd | Construction | 2024 |
| GBR Consulting Engineers Ltd. | Professional & scientific | 2016 |
| GC Build and Create Ltd | Construction | 2020 |
| GCA Management Limited | Real estate | 2014 |
| Gcfd Limited | Professional & scientific | 2021 |
| Gdevcon Limited | Administrative & support | 2017 |
| Gecko Hair on the Hill Ltd | Other services | 2007 |
| Gecko Tree Surgeons Ltd | Administrative & support | 2025 |
| Geekstar Limited | Manufacturing | 2008 |
| GEM Collective Ltd | Wholesale & retail | 2025 |
| Gemini Emissions Reduction LLP | | 2005 |
| Gemski Productions Limited | Information & communication | 2007 |
| General Flavours & Fragrances Ltd | Manufacturing | 1987 |
| Generation 3 Limited | Health & social care | 2018 |
| Generation Adept Ltd | Information & communication | 2024 |
| Generation Evolve Ltd | Education | 2023 |
| Genesis Contract Services Ltd | Administrative & support | 2005 |
| Genesis Management Services UK Limited | Real estate | 2017 |
| Genesis Roofing Limited | Construction | 2013 |
| Genspira Ltd | Professional & scientific | 2019 |
| Gentian (Harveys Deli) Limited | Wholesale & retail | 2010 |
| Gentian Abingdon Limited | Construction | 2022 |
| Gentian Capital Investments Limited | Financial services | 2021 |
| Gentian Catisfield Lane Limited | Households | 2023 |
| Gentian Chichester Limited | Construction | 2024 |
| Gentian Developments (Petersfield) Limited | Construction | 2011 |
| Gentian Developments Limited | Construction | 2021 |
| Gentian Fontwell Limited | Construction | 2024 |
| Gentian Hackney Limited | Construction | 2016 |
| Gentian Kingham Ltd | Construction | 2001 |
| Gentian Kingsworthy Limited | Administrative & support | 2025 |
| Gentian Minsters Limited | Real estate | 2026 |
| Gentian North Shrewsbury Limited | Construction | 2024 |
| Gentian North Whiteley Limited | Construction | 2023 |
| Gentian Projects (Oxfordshire One) Limited | Real estate | 2014 |
| Gentian Winchester Limited | Construction | 2025 |
| Geoconsilium Limited | Professional & scientific | 2017 |
| Geojam Ltd | Information & communication | 2015 |