| Firstverge Residents Association Limited | Households | 1984 |
| Fittleworth Medical Limited | Wholesale & retail | 1984 |
| Fitzalanirvineconsultants Limited | Public administration | 2025 |
| Fizzle Limited | Construction | 2011 |
| FJ Training Ltd | Education | 2025 |
| Flashfabs Limited | Manufacturing | 2024 |
| Flashings & Fabrications Holdings Ltd | Financial services | 2020 |
| Flashings & Fabrications Services Ltd | Manufacturing | 2008 |
| Flintgate Limited | Information & communication | 2025 |
| Flipfile Limited | Wholesale & retail | 1988 |
| Flourish Coaching, Training and Development Limited | Education | 2019 |
| Fluffylicious Limited | Manufacturing | 2019 |
| Focusware Limited | Real estate | 1988 |
| Foothold International Brands Limited | Administrative & support | 2010 |
| Footlink UK Limited | Arts & recreation | 2025 |
| Forbon Court Tenants Association Limited | Real estate | 1959 |
| Ford Electro-Plating Limited | Manufacturing | 1984 |
| Foreshaw Brookes Education Limited | Education | 2025 |
| Foreshore Electrical Group Ltd | Construction | 2023 |
| Foreshore Electrical Ltd | Extraterritorial | 2024 |
| Foreshore Group Ltd | Extraterritorial | 2024 |
| Forest Activities Limited | Arts & recreation | 2016 |
| Forest Bay Trading Ltd | Wholesale & retail | 2025 |
| Forex Trading Boutique Ltd | Wholesale & retail | 2014 |
| Forge the Training Club Ltd | Arts & recreation | 2020 |
| Forge Works Limited | Professional & scientific | 2025 |
| Formet Fabrications Limited | Manufacturing | 2003 |
| Fortyfour Solutions Ltd | Professional & scientific | 2025 |
| Fosters (Management) Limited | Households | 1980 |
| Fosters Plumbing & Heating Limited | Construction | 2005 |
| Foundry Cast Iron Limited | Wholesale & retail | 2017 |
| Four Seasons (Builders) Limited | Construction | 1967 |
| Fourways RTM Company Limited | Households | 2005 |
| FOX Leasing Limited | Construction | 2016 |
| Frailtyiq Ltd | Health & social care | 2014 |
| Frame Breach Ltd | Information & communication | 2018 |
| Framework Accounting Limited | Professional & scientific | 2002 |
| Francis Court RTM Company Limited | Households | 2010 |
| Fraser Adamson Associates Ltd | Professional & scientific | 2012 |
| Fraser Pump Limited | Professional & scientific | 2021 |
| Freddy Freelance Ltd | Information & communication | 2013 |
| Frederick William & Company Limited | Real estate | 1959 |
| Fredlina Group Limited | Transport & logistics | 2025 |
| Freeholders 2020 Ltd | Households | 2020 |
| Freeloading Freeholders RTM Company Ltd | Households | 2025 |
| Fresh Carvery Limited | Hospitality | 2013 |
| Fresh Dental Care Limited | Health & social care | 2023 |
| Friendship Developments Limited | Real estate | 2018 |
| Fsnbf Limited | Hospitality | 1991 |
| FST Limited | Households | 1988 |
| FTS Training and Safety Ltd | Public administration | 2017 |
| Fulcra Creative Limited | Professional & scientific | 2025 |
| Full Fibre Network Group Ltd | Information & communication | 2020 |
| Fulmer Court (Worthing) Management Company Limited | Households | 1972 |
| Fundamentally Fit Limited | Arts & recreation | 2014 |
| Fundraising Action Limited | Administrative & support | 2015 |
| Furnigym Ltd | Professional & scientific | 2026 |
| Fuse Studios - Sussex Ltd | Real estate | 2025 |
| Fusion Finds Sussex Ltd | Wholesale & retail | 2025 |
| Future Designer Homes - Canal Cottage Limited | Real estate | 2025 |
| Future Designer Homes - Tar's Farm Limited | Real estate | 2024 |
| Future Designer Homes - the Barn Ltd | Real estate | 2023 |
| Future Designer Homes Portfolio Limited | Real estate | 2024 |
| Future Live Ltd | Real estate | 2019 |
| G&Vproperty Ltd | Real estate | 2024 |
| G.D. Precision (CNC) Limited | Manufacturing | 2003 |
| G.P. Products (UK) LLP | | 2006 |
| Gale Charman Computing Solutions Limited | Information & communication | 2014 |
| Gallagher Property Group Ltd | Real estate | 2026 |
| Gamarim Limited | Transport & logistics | 2023 |
| Gameroo Ltd | Information & communication | 2018 |
| GAS Heat Ltd | Other services | 2011 |
| Gascomm South East Ltd | Administrative & support | 2017 |
| Gate Foods Ltd | Hospitality | 2026 |
| GB Builders 77 Ltd | Construction | 2017 |
| Gbolo Limited | Health & social care | 2018 |
| GD Electrics & Renewable Energy Ltd | Construction | 2019 |
| GD MEP Limited | Construction | 2018 |
| GD Plant Hire Ltd | Construction | 2018 |
| Gemina Ltd | Manufacturing | 2003 |
| Gemma Knight Ltd | Professional & scientific | 2021 |
| Genoman Limited | Households | 1986 |
| Geodent Ltd | Health & social care | 2025 |
| Geraghty and Sons Limited | Manufacturing | 2024 |
| Gerry's Fly-Tying Limited | Real estate | 1967 |
| Ggtm Financial & Management Services Limited | Professional & scientific | 2026 |
| Ggtm Properties Limited | Real estate | 2021 |
| Giacto Adventures Ltd | Administrative & support | 2026 |
| Giles Smith (Shoreham) Limited | Financial services | 2010 |
| Gili Properties Limited | Real estate | 2023 |
| Gillam Insurance Brokers Limited | Financial services | 2025 |
| Gillion-It Ltd | Information & communication | 2024 |
| GIN Genie Distillery Limited | Manufacturing | 2019 |
| Gintaras Ltd | Construction | 2023 |
| Girt Ltd | Information & communication | 2018 |
| Glass House Creations Ltd | Health & social care | 2020 |
| Glencairn Consulting Limited | Information & communication | 2012 |
| Glencathara House Management Company Limited | Households | 2003 |
| Global Commerce Navigators CIC | Professional & scientific | 2021 |
| Global Food Standards Limited | Administrative & support | 2003 |