| EWS QP Solutions Ltd | Professional & scientific | 2025 |
| Excito Vita Limited | Information & communication | 2019 |
| Executemps Recruitment Limited | Administrative & support | 2011 |
| Executive Network and Business Leadership Experience Limited | Professional & scientific | 2018 |
| Executive Travel Services Ltd | Transport & logistics | 2015 |
| Exor Waste Services Limited | Administrative & support | 2013 |
| Expand Your Mind Ltd | Health & social care | 2026 |
| Expert Support Solutions Limited | Professional & scientific | 2024 |
| Express Service Engineering Limited | Manufacturing | 1985 |
| Exterior Jointing Services Ltd | Construction | 2021 |
| Exterior Lighting Services Limited | Construction | 1993 |
| EY Capital Shfl Ltd | Professional & scientific | 2023 |
| EYE Catching Limited | Extraterritorial | 2004 |
| EYE Definition Limited | Health & social care | 2011 |
| EYE Resolution Ltd | Health & social care | 2016 |
| F and V Consulting Limited | Health & social care | 2011 |
| F J Talent UK Limited | Information & communication | 2024 |
| F. Galiano Consulting Limited | Professional & scientific | 2015 |
| F.C.Eddershaw & SON Limited | Real estate | 1919 |
| F.M.A.B Investments Ltd | Real estate | 2025 |
| F.P.Hurley & Sons Limited | Construction | 1949 |
| Facade Group Ltd | Administrative & support | 2021 |
| Facilities & Waste Management Ltd | Water & waste | 2021 |
| Facility Maintenance of Buildings Ltd | Construction | 2021 |
| Fadeout Mobile Smart Repairs and Valeting Ltd | Wholesale & retail | 2014 |
| Fadhl ALI Abdullah Limited | Manufacturing | 2026 |
| Fads & Fashions Limited | Wholesale & retail | 2016 |
| Fady Joseph Limited | Health & social care | 2011 |
| Fairfield Properties (Bridgend) Limited | Construction | 1986 |
| Fairplan 365 Ltd | Information & communication | 2021 |
| Falcon Cleaning Academy Ltd | Professional & scientific | 2023 |
| Family Mediation South Wales Limited | Health & social care | 2016 |
| Fantastic Designs Limited | Administrative & support | 2018 |
| Fare Properties Limited | Real estate | 2021 |
| Faria Ltd | | 1984 |
| Farmtrack Limited | Professional & scientific | 2014 |
| Farmtrack Renewables Ltd | Professional & scientific | 2022 |
| Farravale Builders Limited | Construction | 2007 |
| Farsight Partnership LLP | | 2012 |
| Fast Track Childcare Solutions Limited | Education | 2010 |
| Fastpc-Cymru Limited | Information & communication | 2016 |
| Federation of Community Engagement C.I.C. | Professional & scientific | 2024 |
| Feel Good Invites Limited | Wholesale & retail | 2014 |
| Felicity Jewellers Limited | Wholesale & retail | 1995 |
| Felin Fach Properties Limited | Real estate | 2024 |
| Ferguson Crushing & Screening Equipment (UK) Ltd | Wholesale & retail | 2020 |
| Fernblake Limited | Information & communication | 2024 |
| Ferncloud Limited | Professional & scientific | 2025 |
| Fernreed Limited | Professional & scientific | 2014 |
| Fernride Limited | Extraterritorial | 2025 |
| Fernrock Limited | Wholesale & retail | 2024 |
| Fernwynn Limited | Transport & logistics | 2020 |
| Field Wise Support Limited | Agriculture & fishing | 2025 |
| Fieldcam Limited | Extraterritorial | 2026 |
| Fields Associates Limited | Information & communication | 2002 |
| Fields Data Recovery Limited | Information & communication | 2008 |
| Fields Employee Ownership Trustee Limited | Professional & scientific | 2025 |
| Fields Group Limited | Information & communication | 2006 |
| Fields Holdings Limited | Information & communication | 2016 |
| Fieldwork Studio C.I.C. | Agriculture & fishing | 2023 |
| Fight OR Perish Limited | Wholesale & retail | 2021 |
| Financialex Ltd | Financial services | 2021 |
| Finclean Limited | Hospitality | 1986 |
| Fine Line Architectural Services Limited | Professional & scientific | 2003 |
| Fine Lines Skin Clinic Limited | Other services | 2023 |
| Finn David Properties Ltd | Real estate | 2025 |
| Fire Bugged Ltd | Public administration | 2022 |
| Fire Without Smoke Software Limited | Information & communication | 2002 |
| First 4 Numbers Ltd | Manufacturing | 2007 |
| First B2B Solutions Limited | Professional & scientific | 2012 |
| First Call Roofing Ltd | Construction | 2025 |
| First Class Gym Limited | Arts & recreation | 2004 |
| First Manor Property Ltd | Real estate | 2021 |
| First Phones Ltd | Information & communication | 2017 |
| First Rate Products Limited | Real estate | 2004 |
| Firstdirectlocum Limited | Administrative & support | 2022 |
| Firstwake Ltd | Arts & recreation | 2025 |
| Firu Outdoors Limited | Wholesale & retail | 2021 |
| Fitlife Coaching Ltd | Health & social care | 2019 |
| Fitpackuk Ltd | Wholesale & retail | 2025 |
| Five Beans Holdings Limited | Real estate | 2021 |
| Five Beans Limited | Real estate | 2017 |
| Five Ever Ltd | Extraterritorial | 2021 |
| FIVE.30 Ltd | Professional & scientific | 2014 |
| Fivefold Studios Limited | Information & communication | 2019 |
| FJ Tree and Landscapes Ltd | Administrative & support | 2025 |
| FJE Property Management Ltd | Real estate | 2020 |
| FJW Bricklaying Ltd | Construction | 2024 |
| FJW Brickwork Ltd | Construction | 2026 |
| Flat Holms Construction Limited | Construction | 1995 |
| Fleet Group Services Limited | Administrative & support | 2026 |
| Flight Crates Limited | Transport & logistics | 2020 |
| Flight Support Ltd | Professional & scientific | 2016 |
| Flipping Landlords Ltd | Construction | 2024 |
| Floatridge Limited | Manufacturing | 1994 |
| Floorstyle by Paul Rausa Ltd | Construction | 2020 |
| Florence Developments Ltd | Real estate | 2025 |
| Florence Green Ltd | Manufacturing | 2020 |
| Florentine Properties Limited | Real estate | 2025 |
| Florist Printers Limited | Manufacturing | 2016 |