| Foreign Debt Settlement Corporation of Pakistan Ltd | Information & communication | 2022 |
| Foreign Homes Limited | Construction | 2019 |
| Foreign Trading Agency Ltd | Wholesale & retail | 2013 |
| Foremaster Limited | Manufacturing | 2004 |
| Forensic Psychology Consultancy (UK) Limited | Professional & scientific | 2014 |
| Forensic Resources Limited | Professional & scientific | 2007 |
| Foresea Ltd | Wholesale & retail | 2020 |
| Foresight Civils Ltd | Construction | 2019 |
| Foresight Engineering PVT Ltd | Construction | 2025 |
| Foresight Globe GZ Trading Limited | Wholesale & retail | 2025 |
| Foresite Surveyors Ltd | Professional & scientific | 2011 |
| Forest Auto Sales Ltd | Wholesale & retail | 2018 |
| Forest Comes Farming Ltd | Agriculture & fishing | 2024 |
| Forest Court Management Company (Cardiff) Limited | Households | 1989 |
| Forest Crossings Trading Limited | Wholesale & retail | 2025 |
| Forest Global Ltd | Financial services | 2022 |
| Forest Hill Services Limited | Other services | 2017 |
| Forest Invest Ltd | Real estate | 2022 |
| Forest of Cardiff | Agriculture & fishing | 1991 |
| Forest Stoves and Fires Limited | Wholesale & retail | 2013 |
| Forest Youth Services Ltd | Health & social care | 2020 |
| Forest Youth Services RCH Ltd | Health & social care | 2026 |
| Forever Face Clinic Ltd | Other services | 2023 |
| Forever Inked Ltd | Other services | 2014 |
| Forever Leisure Ltd | Hospitality | 2019 |
| Forge Commercial Finance Limited | Financial services | 2020 |
| Forge Path Tech Ltd | Information & communication | 2025 |
| Forge Productions Limited | Wholesale & retail | 2021 |
| Forge the Star Entertainment Limited | Wholesale & retail | 2025 |
| Forge the Way Ltd | Manufacturing | 2020 |
| FORGE83 Limited | Education | 2024 |
| Forgeecho Ventures Limited | Education | 2024 |
| Forgehub Ltd | Information & communication | 2018 |
| Forgekey Limited | Information & communication | 2020 |
| Forgemaster (Estate) Limited | Manufacturing | 2016 |
| Forgesphere Solutions Ltd | Information & communication | 2026 |
| Forget ME NOT Pets Ltd | Professional & scientific | 2017 |
| Forgewell Construction Limited | Construction | 2025 |
| Forging Leads Limited | Other services | 2025 |
| Forgotten Hospitality Ltd | Professional & scientific | 2019 |
| FORHER1 Ltd | Wholesale & retail | 2025 |
| Fork & Field Limited | Hospitality | 2025 |
| Fork Studio Ltd | Information & communication | 2018 |
| Forklifts International Limited | | 1982 |
| FORM8 Construction Ltd | Construction | 2020 |
| Forma Artifex Limited | Professional & scientific | 2026 |
| Formal and Casual Style (Facs) Limited | Manufacturing | 2024 |
| Format Display Limited | Administrative & support | 2002 |
| Formation Construction Ltd | Construction | 2023 |
| FORMATION8 Brickwork Limited | Manufacturing | 2015 |
| Formerly Bars Limited | Hospitality | 2014 |
| Formfix Limited | Construction | 2012 |
| Formine International Ltd | Wholesale & retail | 2023 |
| Formis Construction Limited | Administrative & support | 2017 |
| Formova Distribution UK Ltd | Manufacturing | 2026 |
| Formula 1 Solutions Limited | Wholesale & retail | 2018 |
| Forresters Car Club Limited | Arts & recreation | 2005 |
| Forse Domani PC | | 2016 |
| Fortas (Midlands) Ltd | Construction | 2019 |
| Fortas Homes Ltd | Construction | 2007 |
| Forte Future Orbis Ltd | Wholesale & retail | 2018 |
| Forte School of Music (Cardiff) Limited | Education | 2005 |
| Forte Web Solutions Ltd | Information & communication | 2012 |
| Fortech Alliance Limited | Professional & scientific | 2014 |
| Fortech Group Limited | Construction | 2018 |
| Fortem Services Limited | Public administration | 2016 |
| Fortexis Capital Management LLP | | 2025 |
| Forth Bridge OPS Limited | Information & communication | 2022 |
| Forth Valley Electrical Ltd | Construction | 2021 |
| Forthright Accountancy Limited | Professional & scientific | 1998 |
| Forthside Inns Ltd | Hospitality | 2019 |
| Fortifai Systems UK Limited | Information & communication | 2025 |
| Fortis Boxing Limited | Professional & scientific | 2024 |
| Fortis Commerce Ltd | Wholesale & retail | 2022 |
| Fortis Cricket Limited | Professional & scientific | 2024 |
| Fortis Darts Limited | Professional & scientific | 2024 |
| Fortis Football Limited | Professional & scientific | 2024 |
| Fortis Innovations Limited | Information & communication | 2025 |
| Fortis Rugby Limited | Professional & scientific | 2024 |
| Fortis Sports Group Limited | Professional & scientific | 2024 |
| Fortis Sports Management Limited | Professional & scientific | 2023 |
| Fortis Sports Marketing Limited | Professional & scientific | 2024 |
| Fortis Tennis Limited | Professional & scientific | 2024 |
| Fortislegion Security Ltd | Information & communication | 2023 |
| Fortitude Management Consulting Limited | Professional & scientific | 2018 |
| Fortitude Therapy Ltd | Professional & scientific | 2021 |
| Fortivest Limited | Administrative & support | 2025 |
| Fortress Guarding Services Limited | Administrative & support | 2025 |
| Fortress Procurement UK Ltd | Other services | 2020 |
| Fortuna Designs Ltd | Wholesale & retail | 2017 |
| Fortune and Fame Limited | Wholesale & retail | 2022 |
| Fortune Basket YL62 Limited | Wholesale & retail | 2024 |
| Fortune Corporate Solutions Ltd | Professional & scientific | 2022 |
| Fortune FX Ltd | Financial services | 2021 |
| Fortune Music Ltd | Manufacturing | 2018 |
| Fortus Group PC | | 2017 |
| Forty Bricks Ltd | Real estate | 2025 |
| Forty Builders Ltd | Construction | 2015 |
| Forty Fifteen Ltd | Professional & scientific | 2024 |
| Forty Hills Technology Ltd | Professional & scientific | 2015 |