| Franklin Lawson Associates Limited | Professional & scientific | 2019 |
| Fraser's Timber Supplies Ltd | Manufacturing | 2024 |
| Fream Ltd | Professional & scientific | 2024 |
| Freedom Trails Limited | Administrative & support | 2018 |
| Freeth Construction Consultants Limited | Professional & scientific | 2003 |
| Fresh Traditions Ltd | Professional & scientific | 2021 |
| Freshfit Box Ltd | Wholesale & retail | 2017 |
| Freshpay Limited | Information & communication | 2021 |
| FRF Holding Group Ltd | Financial services | 2024 |
| FRF Property Ltd | Construction | 2023 |
| Friars Commercial Products Limited | Wholesale & retail | 1937 |
| Friendly Fitness Ltd | Arts & recreation | 2022 |
| Friends Legal (Marketing) Limited | Financial services | 2008 |
| Friends of Horsham Park C.I.C. | Arts & recreation | 2019 |
| Fringe Rebels Limited | Wholesale & retail | 2023 |
| Fritz Limited | Financial services | 1994 |
| Frontline Care Services Ltd | Administrative & support | 2026 |
| Froot Pops Ltd | Manufacturing | 2025 |
| Fruit and VEG Boxes Horsham Ltd | Wholesale & retail | 2017 |
| FST Capital Limited | Financial services | 2022 |
| FTB Inns Limited | Hospitality | 2018 |
| Full Fathom Limited | Professional & scientific | 2019 |
| Funeral Order of Service Limited | Other services | 2024 |
| Funn Limited | Manufacturing | 1998 |
| Fusilier Electrical Limited | Construction | 1978 |
| Fusion Performance Training Ltd | Arts & recreation | 2021 |
| Fusion Project Services Ltd | Construction | 2018 |
| Fusion Wealth Limited | Financial services | 2010 |
| Fusion-Marketing Limited | Professional & scientific | 2015 |
| Future Contracting Sussex Limited | Other services | 2024 |
| Future Green Finance Limited | Energy | 2011 |
| Future Index Partners Ltd | Professional & scientific | 2025 |
| Future Mindset Ltd | Other services | 2020 |
| Future Properties Sussex Ltd | Real estate | 2024 |
| Future Webs Ltd | Information & communication | 2014 |
| Futurefit Energy Ltd | Professional & scientific | 2025 |
| FY5 Services Ltd | Professional & scientific | 2011 |
| G & N Laboratory Limited | Wholesale & retail | 2007 |
| G & T Cunningham Limited | Construction | 2019 |
| G and N Medtech Limited | Administrative & support | 2024 |
| G B E Distribution Limited | Transport & logistics | 2011 |
| G E Marketing Limited | Professional & scientific | 2013 |
| G Prince Haulage Ltd | Transport & logistics | 2019 |
| G Schulz & Company Ltd | Professional & scientific | 2014 |
| G T Lifting Solutions Limited | Administrative & support | 2002 |
| G W Capital Investment Ltd | Financial services | 2026 |
| G&T Essentials Ltd | Construction | 2026 |
| G&T Wilkinson Builders Ltd | Other services | 2023 |
| G-Star Intelligence Ltd | Professional & scientific | 2025 |
| G.B. Solar Barn Build Ltd | Construction | 2025 |
| G.W.Ford & Son(Builders)Limited | Real estate | 1957 |
| G16 Enterprises Ltd | Wholesale & retail | 2018 |
| G16 Global Ltd | Wholesale & retail | 2015 |
| G16 Ltd | Wholesale & retail | 2015 |
| G2 Consulting (UK) Ltd | Administrative & support | 2014 |
| G2 Technology Limited | Extraterritorial | 2015 |
| G2I Ltd | Financial services | 2017 |
| G4CP Consulting Ltd | Professional & scientific | 2024 |
| Gabari Group Limited | Administrative & support | 2024 |
| Gables Residents Association Limited(The) | Households | 1964 |
| GAC Mechanical Services Limited | Energy | 2010 |
| Galambos Designs Limited | Professional & scientific | 2014 |
| Galena Real Estate Ltd | Real estate | 2015 |
| Galloways Accounting (CM) Limited | Professional & scientific | 2009 |
| Galloways Accounting (Horsham) Limited | Professional & scientific | 2003 |
| Galmerrow Securities Limited | Financial services | 1968 |
| Game Audio Resource Ltd | Information & communication | 2018 |
| Garden Rooms for Sale Ltd | Wholesale & retail | 2023 |
| Gardeners DEN Limited | Administrative & support | 2014 |
| Gardiners Electrics Ltd | Construction | 2016 |
| Gardner Electrical Enterprises Limited | Construction | 2017 |
| Gartree Scott Limited | Professional & scientific | 2021 |
| Gassons Property Ltd | Real estate | 2023 |
| Gated Engineering Ltd | Professional & scientific | 2025 |
| Gateway Education Global Ltd | Education | 2014 |
| Gatwick Distribution Services Limited | Administrative & support | 2006 |
| Gatwick Flyers (2008) Trampoline Club | Arts & recreation | 2008 |
| Gatwick Forklifts Ltd | Manufacturing | 2017 |
| Gatwick Manor Property Ltd | Real estate | 2020 |
| Gatwick Park Mechanical Services Limited | Construction | 1980 |
| Gatwick Worth Hotel Limited | Extraterritorial | 2004 |
| GB Fire Limited | Administrative & support | 2021 |
| GB Theatre Company Limited | Arts & recreation | 2010 |
| GBC a Ltd | Households | 2019 |
| GBR Trading Ltd | Hospitality | 2024 |
| GC Flight Services Ltd | Transport & logistics | 2024 |
| Gcam Hire Ltd | Administrative & support | 2009 |
| GCS Builders Ltd. | Construction | 2013 |
| GDB Investments Limited Liability Partnership | | 2008 |
| Gdmouldings Ltd | Construction | 2021 |
| GDS Properties (Horsham) Ltd | Construction | 2017 |
| Geared UP Events Limited | Other services | 2018 |
| Gecko Electrical Co Limited | Construction | 2005 |
| Geenius Limited | Professional & scientific | 2009 |
| Geeze Creative Limited | Professional & scientific | 2015 |
| Gematria Ltd | Wholesale & retail | 2002 |
| Gemini Aerospace Ltd. | Information & communication | 1997 |
| Gemini Communications Limited | Information & communication | 2004 |
| Gemini IT (UK) Ltd | Information & communication | 2011 |
| Gemini T.M.L. Limited | Information & communication | 2001 |