| Fisher Consulting Ltd | Professional & scientific | 2025 |
| Fist Bump Games Ltd | Manufacturing | 2023 |
| Fit Cake Ltd | Manufacturing | 2024 |
| Fit Vitae Ltd | Arts & recreation | 2019 |
| Fitzmaurice Carriers Limited | Transport & logistics | 1965 |
| Fitzmaurice Data Consulting Ltd | Information & communication | 2023 |
| Five Acres Home Ltd | Health & social care | 2017 |
| Five Furlongs Country Park Limited | Hospitality | 2017 |
| Five Star Promotions (UK) Ltd | Arts & recreation | 2013 |
| Five Star Valet Limited | Wholesale & retail | 2014 |
| Fiveash Media Limited | Professional & scientific | 2017 |
| Fixidea Coatings Ltd | Construction | 2016 |
| Fixio Crawley Ltd | Information & communication | 2025 |
| Fizx Logistics Ltd | Transport & logistics | 2024 |
| FJ Motor Trading Ltd | Wholesale & retail | 2023 |
| FJ Repairs and Maintenance Ltd | Construction | 2023 |
| FJS Roofing Ltd | Construction | 2024 |
| FK Power Consultancy Ltd | Professional & scientific | 2022 |
| Flame & FRY Ltd | Hospitality | 2024 |
| Flamepoint Ltd | Administrative & support | 2023 |
| Flash Technology Ltd | Information & communication | 2026 |
| Flashback Construction Limited | Manufacturing | 2026 |
| Flashback Designs Ltd | Manufacturing | 2026 |
| Flecos UK Ltd | Manufacturing | 2022 |
| Fleet Motors Ltd | Wholesale & retail | 2025 |
| Fleet Services & CMC Limited | Wholesale & retail | 2003 |
| Fleet Services (Crawley) Limited | Wholesale & retail | 2018 |
| Flexercise Wlhb | Arts & recreation | 1950 |
| Flightshirts Ltd | Wholesale & retail | 2025 |
| Flint Physiotherapy Ltd | Health & social care | 2026 |
| FLO Right Services Limited | Construction | 2014 |
| Flockstone Electrical Wholesale Limited | Wholesale & retail | 2026 |
| Flockstone Group Limited | Information & communication | 2019 |
| Floor and Order Ltd | Construction | 2026 |
| Florarosa Design Limited | Manufacturing | 2016 |
| Florence Apartments Limited | Real estate | 2003 |
| Flower Consultancy Limited | Professional & scientific | 2025 |
| Flowmarkets Ltd | Financial services | 2025 |
| Flux Storage PTE Ltd | Other services | 2026 |
| FLY Britannia Limited | Administrative & support | 2025 |
| Flying by FOY Limited | Other services | 1992 |
| Flynn & FLO Productions Ltd | Arts & recreation | 2019 |
| FMS Analytics Ltd | Professional & scientific | 2023 |
| Fnet (UK) Limited | Real estate | 2002 |
| FNM Motors Limited | Wholesale & retail | 2025 |
| Fnnr Limited | Financial services | 2025 |
| Focus Logistics Limited | Transport & logistics | 2016 |
| Focus Style Limited | Extraterritorial | 1999 |
| Foley Land Developments Ltd | Construction | 2019 |
| Fone M8 UK Ltd | Wholesale & retail | 2019 |
| Food Mine 1 Ltd | Hospitality | 2025 |
| Food Mine 3 Ltd | Hospitality | 2025 |
| Food Mine Ltd | Hospitality | 2025 |
| FOODBOX88 Limited | Hospitality | 2025 |
| Footgolfer UK Limited | Arts & recreation | 2017 |
| Footzie Footcare Ltd | Health & social care | 2019 |
| FOR the Love of Bakes Ltd | Wholesale & retail | 2021 |
| Force Drainage Ltd | Water & waste | 2024 |
| Ford Aviation Services Limited | Administrative & support | 2019 |
| Foreign Education Services Limited | Education | 2024 |
| Forest Downs Investments Limited | Professional & scientific | 1988 |
| Forest Lodge Services Ltd. | Information & communication | 2002 |
| Forestfield Management Company Limited | Real estate | 1980 |
| Forestside Experiences Limited | Hospitality | 2025 |
| Forgepoint Holdings Ltd | Financial services | 2025 |
| Forgiven Sins Tattoo Ltd | Other services | 2024 |
| Forlence IT Ltd | Information & communication | 2025 |
| Form and Function Clinic Ltd | Health & social care | 2022 |
| Formulation 1 Limited | Manufacturing | 2009 |
| Forrest Real Estate Ltd | Real estate | 2021 |
| Fort Haven Healthcare Limited | Health & social care | 2023 |
| Forte Property Limited | Real estate | 2004 |
| Fortitudex Ltd | Arts & recreation | 2025 |
| Fortuna Divitiae ET Potentia Ltd | Financial services | 2025 |
| Fortune Cookie Company Limited | Manufacturing | 1990 |
| Fountain Workshop Holdings Limited | Construction | 2019 |
| Four Go Wild in Sussex Limited | Hospitality | 2013 |
| Foxgrey Properties Ltd. | Real estate | 2004 |
| Foxtail Carpentry and Construction Ltd | Construction | 2023 |
| Foxy Store Ltd | Wholesale & retail | 2025 |
| FPD Architectural Studio Limited | Professional & scientific | 2024 |
| FPI Logistics (UK) Ltd | Transport & logistics | 2018 |
| Frances Beauty Salon Ltd | Other services | 2020 |
| Francesca's Pets Limited | Other services | 2013 |
| Franks Stemp Developments Ltd | Construction | 2026 |
| Frant Committed Company Limited | Health & social care | 2017 |
| Fred K Drylining Limited | Construction | 2020 |
| Fredrick Lawson Limited | Wholesale & retail | 2017 |
| Free Thinking Engineering Limited | Information & communication | 2015 |
| Freedomcall Limited | Information & communication | 2004 |
| Freelance Carpentry Limited | Construction | 2025 |
| Freeston's Fire and Electrical Ltd | Construction | 2025 |
| Freeze Drying Holdings Limited | Financial services | 2015 |
| Freeze Drying Services Limited | Manufacturing | 1991 |
| Freightflow International Limited | Transport & logistics | 1972 |
| Freightfreakz Limited | Administrative & support | 2026 |
| Fresh Again Cleaning Ltd | Administrative & support | 2025 |
| Fresh Management Limited | Professional & scientific | 2014 |
| Fresh Pro Accountancy Services Limited | Information & communication | 2018 |
| Freshfoodcoventry Limited | Hospitality | 2025 |