| FHS Properties Limited | Real estate | 2016 |
| Fiat LUX Communications Ltd | Information & communication | 2018 |
| Fibre Social Media Limited | Professional & scientific | 2025 |
| Fiddle-De-Sticks Ltd | Arts & recreation | 2002 |
| Fieldcross Limited | Transport & logistics | 2002 |
| Fieldsource Group International Brokers Limited | Professional & scientific | 2019 |
| Figar Developments Sandridge Limited | Administrative & support | 2020 |
| Figment Arts Community Interest Company | Arts & recreation | 2007 |
| Figured in Limited | Professional & scientific | 2013 |
| Film Floor Limited | Manufacturing | 2016 |
| Financial Management Consultants (FMC) Limited | Administrative & support | 2010 |
| Finchcape Limited | Administrative & support | 2025 |
| Findafloor Ltd | Construction | 2023 |
| Findon 1972 Limited | Extraterritorial | 2014 |
| Findon Black Horse Ltd | Hospitality | 2019 |
| Findon Chase Management Company Limited | Households | 1999 |
| Findon Flowers Limited | Wholesale & retail | 2003 |
| Findon Place Estate Limited | Real estate | 2019 |
| Findon Place Events Limited | Hospitality | 2019 |
| Findon Rest Ltd | Hospitality | 2014 |
| Findon Software Limited | Information & communication | 2016 |
| Findon Validation Ltd | Professional & scientific | 2019 |
| Findon Valley Home Guard Old Comrades Club Limited | Hospitality | 1946 |
| Findon Valley Ltd | Hospitality | 2023 |
| Findukpeople Ltd | Administrative & support | 2016 |
| Fine Coffee Limited | Hospitality | 2022 |
| Fine Straw Property Ltd | Real estate | 2022 |
| Fine-Cast Foundry Limited | Manufacturing | 2002 |
| Fine-Cast Properties Limited | Real estate | 2013 |
| Finebridge Kitchens Limited | Manufacturing | 2019 |
| Fineform Limited | Construction | 1985 |
| Finesse Concrete Interiors Ltd | Manufacturing | 2017 |
| Fingersmiths Ltd | Arts & recreation | 2015 |
| Fior Dilatte Takeaway Ltd | Hospitality | 2022 |
| Fioridilatte Ltd | Hospitality | 2018 |
| Fire in US Productions Limited | Information & communication | 2026 |
| Fire Services Group UK Ltd | Public administration | 2019 |
| Fire, Salt & Sea Ltd | Health & social care | 2020 |
| Firecracker Investments Limited | Real estate | 2021 |
| Firecrest Education Ltd | Information & communication | 2026 |
| Firefields Design Limited | Information & communication | 2015 |
| Firespring Limited | Information & communication | 2002 |
| Firestone Diamonds Limited | Mining & quarrying | 1998 |
| First Check Roofing Ltd | Construction | 2025 |
| First Choice Enterprise Ltd | Construction | 1998 |
| First Essential Holdings Ltd | Information & communication | 2024 |
| First Impressions Denture Clinic Limited | Health & social care | 2026 |
| First Instance Secretariat Limited | Administrative & support | 1998 |
| Firstbell Limited | Hospitality | 2016 |
| Firstfruit Ventures | Professional & scientific | 2021 |
| Fish in the Sea Limited | Hospitality | 2024 |
| Fishbourne & Windsor Plumbing & Heating Ltd | Construction | 2016 |
| Fit Body Formula Ltd | Arts & recreation | 2012 |
| Fit LAB (Health & Fitness) Limited | Arts & recreation | 2020 |
| Fit LAB Worthing Limited | Arts & recreation | 2018 |
| Fit Squad Global Ltd | Arts & recreation | 2022 |
| Fitness Business Profits Ltd | Education | 2020 |
| Five Dots Worthing Ltd | Hospitality | 2024 |
| Five Island Developments Limited | Other services | 2019 |
| Five Trees Storage LLP | | 2002 |
| Fixauto Worthing Ltd | Wholesale & retail | 2021 |
| Fixfinity Ltd | Wholesale & retail | 2025 |
| Fixsql Ltd | Manufacturing | 2019 |
| Fizzle K Limited | Information & communication | 2021 |
| Flamin Sparks Ltd | Construction | 2024 |
| Flamingo Rock Limited | Wholesale & retail | 2021 |
| Flash Harold Ltd | Arts & recreation | 2003 |
| Flash Plumbing and Heating Services Ltd | Construction | 2018 |
| Flat Yard Ltd | Real estate | 2021 |
| Flawless Creative Limited | Wholesale & retail | 2015 |
| Fleetium Ltd | Transport & logistics | 2026 |
| Fletchers Property Services Ltd | Manufacturing | 2025 |
| Flick Trading Ltd | Wholesale & retail | 2020 |
| Flick.Tech Ltd. | Professional & scientific | 2017 |
| Flight of Dragons Publishing Ltd | Information & communication | 2026 |
| Flightdeck-Experience Limited | Arts & recreation | 2024 |
| Flintside House Limited | Hospitality | 2018 |
| Flintstone Investments Ltd | Real estate | 2025 |
| Flinty's Kitchen Limited | Hospitality | 2025 |
| Flip Enterprises Limited | Information & communication | 2021 |
| Flix Logistics Ltd | Administrative & support | 2020 |
| Flo's Homes Limited | Construction | 2019 |
| Flooring by Sea Ltd | Construction | 2018 |
| Flooring HUT Ltd | Construction | 2015 |
| Flooring Warehouse Direct Ltd | Wholesale & retail | 2020 |
| Floral Cafe Limited | Hospitality | 2019 |
| Floria Holdings LLP | | 2021 |
| Flostars Ltd | Health & social care | 2014 |
| Flowers 4 Worthing Limited | Wholesale & retail | 2022 |
| Fluid Resilience Ltd | Information & communication | 2023 |
| Fluqe Ltd | Information & communication | 2010 |
| Flux Piercing Limited | Other services | 2001 |
| Flybondi Holdings PLC | Financial services | 2024 |
| Flying Fortress Limited | Arts & recreation | 2003 |
| FM Security Solutions Ltd | Administrative & support | 2025 |
| FMD Events & Marketing Limited | Administrative & support | 2025 |
| FMI Properties Limited | Real estate | 2017 |
| Fmlights Ltd | Information & communication | 2021 |
| FNX Screens & Broadcast Limited | Administrative & support | 2025 |
| FO Chichester Ltd | Arts & recreation | 2016 |