| Focus Shift Films Ltd | Information & communication | 2015 |
| Folly Factory Ltd | Information & communication | 2020 |
| Fondo Foods Ltd | Hospitality | 2019 |
| Fontus-Cymru CYF | Wholesale & retail | 2021 |
| Food by Remi Limited | Information & communication | 2023 |
| Food Halal Ltd | Hospitality | 2024 |
| Food Newport Ltd | Hospitality | 2022 |
| Food Safety Diary Ltd | Information & communication | 2021 |
| Foodfrica UK Ltd | Wholesale & retail | 2021 |
| Foose Developments Ltd | Construction | 2018 |
| Footprints Export Enterprises and Sports Management Ltd | Real estate | 2003 |
| Footsteps Medical Care Limited | Health & social care | 2006 |
| Forall Limited | Manufacturing | 1996 |
| Forbetter Care Ltd | Health & social care | 2018 |
| Foreman's Travel Limited | Transport & logistics | 2024 |
| Forest Electrical (South Wales) Limited | Professional & scientific | 2002 |
| Forest House Care Home LD Ltd | Health & social care | 2026 |
| Forest View (I.W.) Limited | Administrative & support | 2007 |
| Forest Walk (Whiteley) Management Company Limited | Households | 2022 |
| Foresthaus Ltd | Construction | 2026 |
| Forestry Firewood Limited | Wholesale & retail | 2020 |
| Forever Green Garden Horticulture and Landscaping Limited | Administrative & support | 2017 |
| Forever Skin Limited | Health & social care | 2020 |
| Forever Tanning Ltd | Other services | 2018 |
| Forfar Healthcare Service Ltd | Health & social care | 2023 |
| Forge Care Homes Limited | Health & social care | 2009 |
| Forge Construction Limited | Construction | 1997 |
| Forge Fitness Shropshire Limited | Arts & recreation | 2025 |
| Forge International Limited | Professional & scientific | 2018 |
| Forgeside Farriers Limited | Agriculture & fishing | 2009 |
| Formoquesti Limited | Households | 2024 |
| Fort Homes Limited | Construction | 2007 |
| Fort Living Limited | Real estate | 2023 |
| Fortem & Saints Company Ltd | Financial services | 2025 |
| Fortever Property Ltd | Real estate | 2025 |
| Forton Road Developments Limited | Construction | 2025 |
| Forton Road Refurbishments Limited | Real estate | 2026 |
| Fortress Upvc Limited | Construction | 2016 |
| Fortunessecrets Apparel Limited | Manufacturing | 2025 |
| Forward Thinking Consultancy Ltd | Professional & scientific | 2018 |
| Fosters Corporation Limited | Administrative & support | 2018 |
| Fosterscorporationhomes Ltd | Real estate | 2026 |
| Fountain Court (Cowes) Management Company Limited | Households | 1985 |
| Fountainhead Technologies Ltd | Information & communication | 2016 |
| Four Corners Cleaners Ltd | Administrative & support | 2022 |
| Four Lakes Management Limited | Real estate | 2023 |
| FOUR4TWO Graphics & Design Ltd | Professional & scientific | 2024 |
| Fourteen Locks Centre Limited | Hospitality | 2014 |
| Fouweather Properties Ltd | Real estate | 2025 |
| Fowl and Fury Newport Limited | Hospitality | 2026 |
| Foxwood Court (Rhiwderin) Management Limited | Households | 1976 |
| Foxy Folk Ltd | Hospitality | 2026 |
| FP Marketing Ltd | Professional & scientific | 2021 |
| FPS Versatile Solutions Ltd | Manufacturing | 2025 |
| FR3K3D Ltd | Manufacturing | 2025 |
| FR4GOOD Ltd | Professional & scientific | 2019 |
| Framable Ltd | Wholesale & retail | 2025 |
| Frances Charles Holdings Limited | Real estate | 2022 |
| Francesca Court (IOW) Management Company Limited | Households | 2007 |
| Francis Hotels Ltd | Real estate | 2014 |
| Francom Project Services Limited | Information & communication | 2015 |
| Frank Burston Limited | Wholesale & retail | 1998 |
| Frankie & Mabel Limited | Wholesale & retail | 2021 |
| Fratechecker Limited | Information & communication | 2024 |
| Fratelli Ahmed Ltd | Hospitality | 2025 |
| Freddie's Future Properties Ltd | Real estate | 2018 |
| Free Flow Traffic Ltd | Construction | 2023 |
| Free Spirit Software Ltd | Information & communication | 2018 |
| Freehold 2-8 Birmingham Road Cowes Limited | Households | 2026 |
| Freelancer Lets Limited | Real estate | 2012 |
| Frejus Smith Property Investments Ltd | Real estate | 2023 |
| French Franks Food Co Ltd | Manufacturing | 2018 |
| Frencheese Ltd | Hospitality | 2017 |
| Fresh and Clean Laundrette and DRY Cleaning Limited | Other services | 2013 |
| Freshwater Bay Management Company Limited | Households | 2020 |
| Freshwater Instrument Control and Automation Limited | Professional & scientific | 2012 |
| Freyhill Limited | Health & social care | 2023 |
| Friars Court Management Committee Limited | Households | 2000 |
| Friars Fruit Ltd | Wholesale & retail | 2019 |
| Friars Limited | Real estate | 1987 |
| Friends Mart Ltd | Wholesale & retail | 2026 |
| Friends of ST Mary's Shop/Cafe Ltd | Hospitality | 2009 |
| Frimley Nest Day Nursery Limited | Health & social care | 2018 |
| Frinton Project Services Ltd | Construction | 2021 |
| FRN Trading Limited | Wholesale & retail | 2021 |
| From Another Ltd. | Professional & scientific | 2021 |
| Front ROW Trading Limited | Extraterritorial | 2019 |
| Front ROW Van Hire Ltd | Wholesale & retail | 2021 |
| Frontline Epcs LLP | | 2010 |
| FRP Studios Ltd | Professional & scientific | 2024 |
| Fruit and NUT Nursery Limited | Agriculture & fishing | 2021 |
| FS10 Promotions Ltd | Arts & recreation | 2023 |
| Fsss Ltd | Other services | 2010 |
| FT Office Solutions Ltd | Professional & scientific | 2019 |
| FTG Assets Limited | Financial services | 2026 |
| Ftsl Worldwide Ltd | Arts & recreation | 2019 |
| Fuel & Move Consulting Ltd | Professional & scientific | 2013 |
| Fuel Cell Sensors Limited | Manufacturing | 2004 |
| Fuel Green Ltd | Wholesale & retail | 2021 |
| Fuhcore Limited | Transport & logistics | 2025 |