| Fabulous Welshcakes Limited | Wholesale & retail | 2007 |
| Facade Care U.K. Limited | Construction | 2020 |
| Face 2 Face Ltd | Transport & logistics | 2018 |
| Face of an Angel Limited | Other services | 2026 |
| Face-T Aesthetics Ltd | Other services | 2024 |
| Facebrick Builders Limited | Construction | 2021 |
| Facecon Property Ltd | Real estate | 2019 |
| Facecon UK Ltd | Health & social care | 2018 |
| Facemasters Ltd | Information & communication | 2024 |
| Faceupcymru Limited | Health & social care | 2005 |
| Fachkraft Security Ltd | Administrative & support | 2020 |
| Facial Aesthetics Consultancy and Training Limited | Education | 2015 |
| Facilitate Holdings Ltd | Information & communication | 2026 |
| Facilities 4 Films Limited | Water & waste | 2019 |
| Facilities/Maintenance/Security Limited | Construction | 2020 |
| Facility Services Limited | Transport & logistics | 2024 |
| Faciunt Regressus Ltd | Financial services | 2024 |
| Factdelta Limited | Information & communication | 2003 |
| Factollis Recruiters Ltd | Administrative & support | 2020 |
| Factorchoice.Net Ltd | Professional & scientific | 2002 |
| Factory Field Ltd | Hospitality | 2026 |
| FACTORY88 Limited | Manufacturing | 2025 |
| Factotem Ltd | Professional & scientific | 2006 |
| Fade Lounge Limited | Other services | 2019 |
| Faded Legends Ltd | Other services | 2025 |
| Fadeset Limited | Transport & logistics | 2016 |
| Fadia Holdings Limited | Professional & scientific | 2015 |
| FAE Digital Ltd | Wholesale & retail | 2025 |
| Fagab Global Limited | Health & social care | 2022 |
| Faglara Services Ltd | Administrative & support | 2022 |
| Fagp Trading Limited | Construction | 2022 |
| Fahim Ltd | Administrative & support | 2026 |
| Fahm IT Limited | Information & communication | 2016 |
| Fahm Properties Limited | Real estate | 2019 |
| Fahrly Ltd | Information & communication | 2022 |
| Fai's Fish Bar (Aberdare) Limited | Hospitality | 2014 |
| Faico Ltd | Wholesale & retail | 2024 |
| Faidh Ltd | Information & communication | 2024 |
| Failo Solutions Ltd | Administrative & support | 2020 |
| Fainlinks Limited | Information & communication | 2025 |
| Fair Balance Foundation | Information & communication | 2020 |
| Fair Build Carpentry& Kitchens Ltd | Construction | 2026 |
| Fair Global Prime Ltd | Administrative & support | 2015 |
| Fair Hair One Ltd | Wholesale & retail | 2025 |
| Fair PAY Services Limited | Administrative & support | 2019 |
| Fair Trade Wales | Information & communication | 2009 |
| FAIR3 Limited | Financial services | 2022 |
| Fairfax Consulting Ltd | Administrative & support | 2017 |
| Fairfield House Care Home Limited | Health & social care | 2017 |
| Fairfield House Solutions Ltd | Information & communication | 2014 |
| Fairfield Security Systems Limited | Construction | 2002 |
| Fairgate Capital Ltd | Financial services | 2016 |
| Fairgate Software Ltd | Information & communication | 2025 |
| Fairlawn Court Limited | Real estate | 1961 |
| Fairlawn Court Management 17062014 Ltd. | Administrative & support | 2014 |
| Fairleigh Court Limited | Administrative & support | 1997 |
| Fairlight Health Limited | Administrative & support | 2010 |
| Fairlyles Group Ltd | Professional & scientific | 2020 |
| Fairmead Court Management Limited | Households | 1991 |
| Fairmerry Limited | Households | 1990 |
| Fairoak Management Company Limited | Households | 2022 |
| Fairoak Mangement Services Ltd | Professional & scientific | 2025 |
| Fairplay Europe Foundation | Information & communication | 2022 |
| Fairplay Mgmt Ltd | Administrative & support | 2017 |
| Fairtrade Services Ltd | Public administration | 2018 |
| Fairwater Barbers Ltd | Other services | 2023 |
| Fairwater Cafe Ltd | Hospitality | 2018 |
| Fairwater Foods Limited | Administrative & support | 2025 |
| Fairwater Garages Employee Trust Limited | Financial services | 2024 |
| Fairwater Garages Limited | Wholesale & retail | 1987 |
| Fairwater Kebab Shop Ltd | Hospitality | 2023 |
| Fairwater RFC 2018 Limited | Other services | 2018 |
| Fairwater Road Management Company Limited | Households | 1995 |
| Fairway Brewing Company Limited | Professional & scientific | 2015 |
| Fairway Management Consultants Ltd | Professional & scientific | 2019 |
| Fairway Meds International Ltd | Wholesale & retail | 2017 |
| Fairway Property Finance Ltd | Financial services | 2025 |
| Fairwood Management Limited | Households | 1992 |
| Fairy Grove Handmade Ltd | Wholesale & retail | 2025 |
| Fairypetal Limited | Wholesale & retail | 2025 |
| Faisal Alzubi Ltd | Wholesale & retail | 2025 |
| Faisal Global Supplies Ltd | Wholesale & retail | 2026 |
| Faith & Focus Limited | Wholesale & retail | 2025 |
| Faith Mental Healthcare Ltd | Health & social care | 2014 |
| Faith Social Work Services Limited | Administrative & support | 2014 |
| Faithful Welshwags Dog Walking & Daycare Ltd | Manufacturing | 2020 |
| Faizway Limited | Administrative & support | 2025 |
| Fajco Limited | Manufacturing | 2019 |
| Fajjar Ltd | Wholesale & retail | 2025 |
| Falafel Baby! Limited | Hospitality | 2026 |
| Falafel Corner Limited | Hospitality | 2024 |
| Falahis Ltd | Wholesale & retail | 2026 |
| Falaise Property Ltd | Real estate | 2016 |
| Falcon Aviation Consultants Limited | Wholesale & retail | 2019 |
| Falcon Brickwork Ltd | Construction | 2024 |
| Falcon Construction Limited | Construction | 2015 |
| Falcon Develop Limited | Construction | 2015 |
| Falcon Facades Ltd | Construction | 2015 |
| Falcon Fire Prevention Limited | Professional & scientific | 2015 |
| Falcon Interiors Design Ltd | Construction | 2013 |