| Foster Trading Limited | Wholesale & retail | 2009 |
| Foundry Garage Clydach Ltd | Wholesale & retail | 2024 |
| Fountain Developments (Sileby) Limited | Construction | 2003 |
| Fountrex Global Logistics Limited | Transport & logistics | 2026 |
| Four A'S Management Limited | Wholesale & retail | 2003 |
| Four Brothers Barbers Limited | Other services | 2020 |
| Four Corners Decorating Ltd | Construction | 2021 |
| Four Nine Investments Ltd | Real estate | 2025 |
| Four Points Trading Limited | Wholesale & retail | 2022 |
| Four Seasons Nature Group Ltd | Wholesale & retail | 2024 |
| Four Walls Talbot Green Ltd | Construction | 2023 |
| Four Waves Media Limited | Information & communication | 2015 |
| FOX Flooring Installations Ltd | Construction | 2024 |
| FOX Flooring Ltd | Wholesale & retail | 2021 |
| FOX Online Limited | Wholesale & retail | 2023 |
| FOX Property Developments Ltd | Construction | 2021 |
| FOX Roofing Ltd | Construction | 2023 |
| FOX Solar Ltd | Construction | 2023 |
| FOX Solutions Limited | Construction | 2018 |
| Foxdale Management Limited | Manufacturing | 1993 |
| Foxhole Road Ltd | Real estate | 2023 |
| FP Online Limited | Arts & recreation | 2017 |
| FPL Group Limited | Professional & scientific | 2025 |
| FPT Business Consulting Ltd | Professional & scientific | 2017 |
| Fractional Founders Ltd | Professional & scientific | 2026 |
| Fragrances UN Limited | Extraterritorial | 2017 |
| Frame King UK Ltd | Construction | 2020 |
| Frances Jenkins Ltd | Professional & scientific | 2022 |
| Francis Events Ltd | Wholesale & retail | 2023 |
| Frango OPS Limited | Hospitality | 2017 |
| Fraser Foods Limited | Wholesale & retail | 2015 |
| Fred Hardie Limited | Other services | 2015 |
| Fred R. Powell & SON Limited | Wholesale & retail | 1942 |
| Frederick House Limited | Information & communication | 2018 |
| Frederick Wheatley Consulting Ltd | Information & communication | 2021 |
| Fredrick Adam Limited | Professional & scientific | 2008 |
| Freedom 26 Productions Limited | Information & communication | 2026 |
| Freedom Longevity Ltd | Real estate | 2020 |
| Freelance Sound Ltd | Other services | 2011 |
| Freetime Beer Co. Limited | Manufacturing | 2016 |
| Freewind Equipment Limited | Wholesale & retail | 2025 |
| Frequent Sounds Ltd | Wholesale & retail | 2023 |
| Fresco Bar Ltd | Hospitality | 2022 |
| Fresh Creative Abertawe CIC | Education | 2020 |
| Fresh Creative Ltd | Arts & recreation | 2020 |
| Fresh Estate & Letting Agents Limited | Real estate | 2011 |
| Fresh Food Event Catering Ltd | Hospitality | 2014 |
| Fresh Grocery Ltd | Wholesale & retail | 2020 |
| Fresh Insight Today Community Interest Company | Other services | 2016 |
| Fresh Start Properties (South Wales) Limited | Construction | 2024 |
| Fresh Start Property Care Ltd | Administrative & support | 2025 |
| Fresh Windows and Doors Ltd | Manufacturing | 2019 |
| Freshbond Limited | Financial services | 1990 |
| Freshlylocaluk Ltd | Wholesale & retail | 2025 |
| Freshturf Ltd | Administrative & support | 2020 |
| Freshwater Interiors Ltd | Construction | 2004 |
| Freya Carlsen Medical Aesthetics Ltd | Health & social care | 2022 |
| Freyni Limited | Hospitality | 2024 |
| FRF (Accident Repair Centre) Ltd | Wholesale & retail | 2004 |
| FRF (South Wales) Limited | Wholesale & retail | 2003 |
| FRF South Wales (Holdings) Limited | Wholesale & retail | 2009 |
| Friends for YOU Limited | Health & social care | 2017 |
| Friends of Pontlliw Park Ltd | Other services | 2021 |
| Friends United Together Limited | Health & social care | 2020 |
| From a Jack to a King Limited | Information & communication | 2013 |
| From Swan to Sea Limited | Transport & logistics | 2025 |
| Front Bar Limited | Real estate | 2021 |
| Front Door Properties Ltd | Real estate | 2025 |
| Froome Burton Limited | Construction | 2021 |
| Froy Marketing Ltd | Professional & scientific | 2024 |
| Frozziyo Ltd | Hospitality | 2021 |
| Frtj Ltd | Wholesale & retail | 2023 |
| FSG Shared Services Limited | Administrative & support | 2025 |
| Ftmb Homes 2022 Limited | Real estate | 2022 |
| FTS Fork Truck Services Ltd | Manufacturing | 2024 |
| Fuego Hospitality Limited | Hospitality | 2023 |
| Fuel Rock Club Limited | Hospitality | 2013 |
| Fuelsion Ltd | Professional & scientific | 2023 |
| Fujm Ltd | Construction | 2025 |
| Full Circle Residential Family Assessments Ltd | Health & social care | 2026 |
| Full Compass Fit OUT Limited | Extraterritorial | 2018 |
| Full Measure Hospitality Ltd | Hospitality | 2026 |
| Full Moon Delight Limited | Hospitality | 2024 |
| Full of Graze Ltd | Hospitality | 2021 |
| Full of Graze Studio Ltd | Hospitality | 2022 |
| Full Power Installations Ltd | Construction | 2026 |
| Fullahead Investments Limited | Professional & scientific | 1996 |
| Fuller Living Ltd | Real estate | 2023 |
| FUN Brands Group Limited | Financial services | 2021 |
| Functional 7 Strength & Conditioning Ltd | Arts & recreation | 2017 |
| Funfair Hire Swansea Ltd | Hospitality | 2025 |
| Funky Business Emporium Ltd | Wholesale & retail | 2016 |
| Funky FUN Factory Ltd | Hospitality | 2023 |
| Funky Noodles Group Ltd | Hospitality | 2022 |
| Funky Noodles Ltd | Hospitality | 2024 |
| Funkynailsbyem Ltd | Other services | 2021 |
| Furlong BAU Limited | Construction | 2021 |
| Furnish ME Ltd | Wholesale & retail | 2021 |
| Furniture UN Limited | Extraterritorial | 2013 |
| Furse Ltd | Wholesale & retail | 2019 |