| Forefront Energy Solutions Ltd | Extraterritorial | 2014 |
| Foresite Geomatics Ltd | Construction | 2014 |
| Forman IT Limited | Administrative & support | 1985 |
| Formo Technologies Ltd | Information & communication | 2026 |
| Fortis Green Advisory Limited | Professional & scientific | 2016 |
| Forty Four Fordwych Road Limited | Households | 1981 |
| Frame Architecture Limited | Professional & scientific | 2015 |
| Francis & Co. (Professional) Ltd | Manufacturing | 2012 |
| Frank Communication Solutions Limited | Other services | 2002 |
| Franklands Court (Garages) Limited | Households | 1989 |
| Franklands Court Limited | Households | 1978 |
| Fraser Communications Ltd | Wholesale & retail | 2013 |
| Freerider Collective Ltd | Wholesale & retail | 2019 |
| Freeway Holdings Ltd | Financial services | 2017 |
| Freeway Investments Ltd | Financial services | 2021 |
| Freeway Tools and Fixings Ltd | Wholesale & retail | 2017 |
| Frethub Limited | Real estate | 2011 |
| Frogbox Digital Limited | Professional & scientific | 2012 |
| Frogbox Marketing Limited | Administrative & support | 2007 |
| Fross Wedding Collections Limited | Wholesale & retail | 2015 |
| Fuller Entertainment Limited | Other services | 2023 |
| G B Electrics Sussex Ltd | Construction | 2012 |
| G Mitchell Limited | Wholesale & retail | 2004 |
| G.D. Rectifiers Limited | Manufacturing | 1964 |
| G.K.S. Computers Ltd. | Information & communication | 1997 |
| G1 Retail Limited | Wholesale & retail | 2024 |
| GA Utilities Limited | Construction | 2012 |
| GAC Property Services Limited | Real estate | 2020 |
| GAC Sussex Limited | Real estate | 2013 |
| Galmac Limited | Real estate | 2026 |
| Gamble Cinematics Limited | Information & communication | 2018 |
| Gamblecam Limited | Information & communication | 2015 |
| Gamblelite Limited | Administrative & support | 2016 |
| Gamblevision Limited | Information & communication | 2015 |
| Garratt Construction Consultants Limited | Professional & scientific | 2023 |
| Gary Varney Film Lighting Limited | Administrative & support | 2019 |
| Gasson GAS Limited | Construction | 2010 |
| Gatherilla Limited | Information & communication | 2025 |
| Gatwick Luggage Fittings Limited | Manufacturing | 1987 |
| Gazzoil Ltd | Financial services | 2025 |
| Gdavison.It Limited | Information & communication | 2025 |
| Genscomercial Ltd | Real estate | 2024 |
| Gentleman's Marble Shop Limited | Manufacturing | 2025 |
| George Forrests Plants Limited | Agriculture & fishing | 2002 |
| Georgina and Richard Haslam Limited | Real estate | 2024 |
| Geovision Surveying Ltd | Construction | 2025 |
| GET IT Nailed Limited | Other services | 2003 |
| Gibson Cargo Limited | Transport & logistics | 2024 |
| Gibson Fibreglass Supplies Limited | Manufacturing | 2022 |
| Gilleselec Ltd | Construction | 2015 |
| GKS Consultants Ltd | Information & communication | 2021 |
| Gladding Interiors Limited | Construction | 2008 |
| Glandford Properties Limited | Real estate | 2019 |
| Glass Lake Finance Limited | Professional & scientific | 2020 |
| Glenfergus Residents Association Limited | Real estate | 1981 |
| GLF Coatings Limited | Manufacturing | 2011 |
| Global Occupational Health Solutions Limited | Health & social care | 2015 |
| Glover Renovations LLP | | 2022 |
| GMP Managed Limited | Professional & scientific | 2010 |
| Go Barking LLP | | 2011 |
| Go-Blue Limited | Real estate | 2000 |
| Gobble UK Representation Ltd | Administrative & support | 2024 |
| Gold Oak Consulting Ltd | Professional & scientific | 2019 |
| Good Times Orthodontics Limited | Health & social care | 2021 |
| Gorgeous Gate Aesthetics Ltd | Other services | 2024 |
| GPW Building & Refurbishment Ltd | Construction | 2024 |
| GR4-PLAY Ltd | Wholesale & retail | 2020 |
| Grange Court (Lewes) Limited | Households | 1980 |
| Grapevine Audio Limited | Information & communication | 2011 |
| Grassroots Professional Services Limited | Health & social care | 2016 |
| Gravenor UK Ltd | Information & communication | 2016 |
| Graymar Developments Ltd | Construction | 2024 |
| Green & Co Accountants Limited | Professional & scientific | 2010 |
| Green and Ridley Ltd | Wholesale & retail | 2019 |
| Green Earth Sussex Limited | Construction | 2021 |
| Green Swifts Limited | Administrative & support | 2015 |
| Greenscapes UK Landscaping Services Limited | Administrative & support | 2012 |
| Greenstede Financial Management Ltd | Professional & scientific | 2024 |
| Greenways Care Home Limited | Health & social care | 2025 |
| Gremlin Musical Instruments Limited | Professional & scientific | 1992 |
| Grendel Consulting Limited | Information & communication | 2016 |
| Greysea Building Contractors Limited | Construction | 2022 |
| Greysea Environmental Management Ltd | Other services | 2018 |
| Griffin Technical Services Ltd | Administrative & support | 2016 |
| Griffin Technical Systems Ltd | Administrative & support | 2025 |
| Grizz Services Limited | Information & communication | 2020 |
| Groovy Grips Limited | Administrative & support | 2023 |
| Grzy Property Group Ltd | Real estate | 2023 |
| GT4-PLAY Ltd | Wholesale & retail | 2019 |
| GTA Civils & Transport Limited | Construction | 2019 |
| GTA Civils Limited | Construction | 2001 |
| GTA Civils Trustee Ltd | Professional & scientific | 2025 |
| Gungadin Services Ltd | Construction | 2021 |
| Guntaj Ltd | Hospitality | 2025 |
| GWE Automotive Ltd | Wholesale & retail | 2025 |
| GWL Roofing Services Ltd | Construction | 2020 |
| Gyamfiwa Ltd | Health & social care | 2025 |
| H & D Air Conditioning EOT Limited | Administrative & support | 2026 |
| H & D Air Conditioning Limited | Administrative & support | 2001 |
| H & V Mechanical Services Ltd. | Professional & scientific | 2001 |