| Fentech Digital Ltd | Professional & scientific | 2025 |
| Fentoryn Ltd | Wholesale & retail | 2025 |
| Feona Trade PC | | 2017 |
| Fepal Inc Ltd | Construction | 2026 |
| Fergus Wheeler Consulting Limited | Professional & scientific | 2020 |
| Ferguson Medical Ltd | Health & social care | 2018 |
| Fergusson Homes Ltd | Real estate | 2025 |
| Fergusson Properties Ltd | Real estate | 2026 |
| Ferkingstad Consulting Services Limited | Extraterritorial | 2025 |
| Fermandell Property Services Ltd | Real estate | 2021 |
| Fern and Twine Ltd | Administrative & support | 2025 |
| Fern Inns Ltd | Hospitality | 2019 |
| Fernandez and Co. Homes Ltd | Real estate | 2025 |
| Fernandez Baca Legal Limited | Administrative & support | 2016 |
| Fernandez Shaw Ltd | Professional & scientific | 2016 |
| Fernandez Shaw Properties Ltd | Real estate | 2017 |
| Fernando Clothing Cardiff Limited | Wholesale & retail | 2024 |
| Fernard Ltd | Other services | 2014 |
| Ferndale Consultancy Limited | Professional & scientific | 2025 |
| Ferndale Propco Limited | Real estate | 2014 |
| Ferndale Scoops and Smile Ltd | Hospitality | 2017 |
| Ferndell Residents Association Limited | Households | 2005 |
| Fernfoliage Ltd | Wholesale & retail | 2025 |
| Fernlea Enterprises Limited | Professional & scientific | 2012 |
| Fernleigh Design Limited | Professional & scientific | 1993 |
| Fernleigh Ltd | Manufacturing | 2024 |
| Fernrate Limited | Health & social care | 2021 |
| Fernreel Limited | Arts & recreation | 2008 |
| FERRARIS1847 Ltd | Wholesale & retail | 2021 |
| Ferrier Hart Thomas (Holdings) Limited | Construction | 2009 |
| Ferrier Hart Thomas Limited | Construction | 2004 |
| Ferris Heating & Plumbing Limited | Construction | 2025 |
| Ferris Holidays Limited | Administrative & support | 2003 |
| Ferrum Consutlants Limited | Manufacturing | 2022 |
| Ferry Ales Brewery Limited | Manufacturing | 2016 |
| Ferry Lane Properties Limited | Real estate | 2017 |
| Ferryboat Guesthouse Ltd | Hospitality | 2022 |
| Ferryman Pictures Ltd. | Information & communication | 2019 |
| Fertility Clinics Holdings Limited | Financial services | 2022 |
| Feruna Ltd | Wholesale & retail | 2025 |
| Ferzan Ltd | Construction | 2024 |
| Fessate Ltd | Wholesale & retail | 2021 |
| Festival Hookups Ltd | Administrative & support | 2014 |
| Festive Collective Ltd | Wholesale & retail | 2026 |
| Festive Feasts Limited | Hospitality | 2020 |
| Festive LEE Limited | Wholesale & retail | 2023 |
| FET Group Limited | Wholesale & retail | 2020 |
| Fetch Security Solutions Limited | Other services | 2019 |
| Fetella Ltd | Wholesale & retail | 2023 |
| Fetty Wash Ltd | Administrative & support | 2024 |
| Fexey Group Ltd | Information & communication | 2024 |
| Feya Group PC | | 2017 |
| Feydrift Ltd | Education | 2025 |
| Feyuqit Ltd | Wholesale & retail | 2023 |
| Feyz OTO Mechanic Ltd | Wholesale & retail | 2024 |
| Fezlio Solutions Ltd | Administrative & support | 2020 |
| Ffair Jobs CIC | Administrative & support | 2022 |
| Ffalala Limited | Education | 2014 |
| Ffansi Coffi CYF. | Manufacturing | 2020 |
| Ffdecor Ltd | Construction | 2020 |
| FFE Premium Roofing Contractors Limited | Construction | 2019 |
| Ffenics Developments Ltd | Construction | 2013 |
| Ffenics Legal Limited | Professional & scientific | 2023 |
| Fferyllfa TY Nant Ltd | Wholesale & retail | 2025 |
| Ffilm Cymru Wales C.B.C | Information & communication | 2006 |
| Ffilm Ffolyn - Y Llyfrgell CYF | Information & communication | 2015 |
| Ffilmiau Gweled Ltd | Professional & scientific | 2016 |
| Ffilmiau Santa Maria CYF | Information & communication | 2026 |
| Ffion's at Vogues Ltd | Other services | 2025 |
| FFL Holdings Limited | Financial services | 2019 |
| Fflamingo CIC | Arts & recreation | 2022 |
| Fflamingo Pinc CYF | Professional & scientific | 2019 |
| Fflipio Ltd | Construction | 2021 |
| Ffloc Coffi Ltd | Hospitality | 2021 |
| Fflur Properties Limited | Real estate | 2021 |
| Ffora UK Ltd | Extraterritorial | 2020 |
| Ffordd Celyn Management Company Limited | Real estate | 2016 |
| Ffordd LAS Ltd | Real estate | 2007 |
| Ffordd TY Unnos (34 36 38 40 42 44) Management Company Limited | Households | 2008 |
| Fforest Oak Limited | Construction | 2020 |
| Ffort Ltd | Wholesale & retail | 2024 |
| Fforwm Services Limited | Education | 1995 |
| Ffotogallery Wales Limited | Arts & recreation | 1983 |
| Ffotoneg Ltd | Professional & scientific | 2023 |
| Ffranc Limited | Information & communication | 2006 |
| Ffrindiau Marla Childminding Services Limited | Health & social care | 2021 |
| Ffwrnes Pizza CYF | Hospitality | 2018 |
| Ffynnon AUR Farming Limited | Agriculture & fishing | 2013 |
| Ffynnon AUR Holdings Limited | Administrative & support | 2013 |
| Ffynnon AUR Limited | Health & social care | 2006 |
| Ffzm Ltd | Other services | 2026 |
| FG Scenic Construction Ltd | Construction | 2025 |
| FGD Nsultancy Ltd | Other services | 2021 |
| FGK Esholdings Ltd | Other services | 2025 |
| FGT Consultants Ltd | Education | 2020 |
| FGT Motor Engineers (Great Harwood) Limited | Wholesale & retail | 1969 |
| FHM Automotive Ltd | Wholesale & retail | 2017 |
| Fhrst Auto's Ltd | Wholesale & retail | 2026 |
| Fiango Star Limited | Transport & logistics | 2022 |
| Fibarex Ventures Limited | Health & social care | 2012 |