| Flynn Healthcare Limited | Health & social care | 2021 |
| Fläktgroup UK Ltd | Manufacturing | 2015 |
| Fmtrans Ltd | Transport & logistics | 2020 |
| FNH Hotels Limited | Hospitality | 2015 |
| Focus Fasteners Ltd | Construction | 2000 |
| Focus Flooring Limited | Extraterritorial | 2014 |
| FOD Developments Limited | Real estate | 2012 |
| Foil Technologies Limited | Manufacturing | 2008 |
| Folbigg Fabrications Limited | Manufacturing | 2002 |
| Foley Capital Limited | Construction | 2022 |
| Foley Farms Limited | Administrative & support | 1964 |
| Foley Farms Trust Company Limited | Extraterritorial | 2001 |
| Folkes Medical Limited | Health & social care | 2015 |
| Follow Progress Ltd | Professional & scientific | 2024 |
| Folly Holdings Limited | Hospitality | 2023 |
| Folly Homes Limited | Real estate | 2025 |
| Folly Lane Management Company Limited | Households | 2005 |
| Foodlyte Limited | Hospitality | 2024 |
| Foodsafe Welding Limited | Manufacturing | 2025 |
| Force Fabs Ltd | Manufacturing | 2020 |
| Forest Oak Publications Limited | Information & communication | 2011 |
| Forest of the Mind Ltd | Health & social care | 2022 |
| Foreva Farmers Limited | Manufacturing | 2021 |
| Foreva Wellness Limited | Hospitality | 2025 |
| Forever Baby Ltd | Wholesale & retail | 2012 |
| Forivor Ltd | Professional & scientific | 2015 |
| Fork Garden Design Limited | Administrative & support | 2010 |
| Formula Motor Group Ltd | Wholesale & retail | 2018 |
| Formusdev Ltd | Information & communication | 2021 |
| Fortis Minerva Limited | Professional & scientific | 2024 |
| Forum 148 Limited | Construction | 1996 |
| Fostronsales Ltd | Wholesale & retail | 2023 |
| Foundry Coaching Ltd | Other services | 2025 |
| Four Elements Properties Ltd | Real estate | 2025 |
| Four Seven Seven Limited | Construction | 2023 |
| Fouronebravo Aviation Ltd | Manufacturing | 2023 |
| Fouronebravo Consulting Limited | Administrative & support | 2023 |
| Fouronebravo Cyber Ltd | Information & communication | 2023 |
| Fouronebravo Group Ltd | Financial services | 2023 |
| Fouronebravo Logistics Ltd | Professional & scientific | 2023 |
| Fouronebravo Risk Management Ltd | Administrative & support | 2023 |
| Fouronebravo Training Ltd | Education | 2023 |
| Fownhope Real Estate Limited | Households | 1980 |
| FOX Direct UK Ltd | Wholesale & retail | 2026 |
| FOX Vehicle Logistics Limited | Transport & logistics | 2016 |
| Foxcorner.Us Limited | Hospitality | 2023 |
| Foxfield Holdings Limited | Real estate | 2023 |
| Foxgrove Securities Limited | Professional & scientific | 1985 |
| Foxley Club Limited | Arts & recreation | 2015 |
| Foxtrot Oscar Security Limited | Information & communication | 2025 |
| FR and J Investments Limited | Real estate | 2020 |
| Frame Windows and Doors Ltd | Construction | 2023 |
| Francesca Ford Consulting Ltd | Professional & scientific | 2025 |
| Franchill Limited | Manufacturing | 2003 |
| Francis Edwards Limited | Wholesale & retail | 1995 |
| Frank's Luxury Biscuit Company Limited | Manufacturing | 2006 |
| Fraser Enterprises Limited | Wholesale & retail | 2007 |
| Frayne Freehold Co. Ltd | Households | 2018 |
| Frazer Miles Trading Limited | Other services | 2002 |
| Free Mind Psychological Services Ltd | Health & social care | 2024 |
| Freedom First Investments Ltd | Real estate | 2024 |
| Freemans of Newent Limited | Manufacturing | 1962 |
| Freens Enterprises Limited | Administrative & support | 2025 |
| Freerein Equipment Limited | Wholesale & retail | 2021 |
| Freerein Organisation Limited | Arts & recreation | 2007 |
| Freewheeling Ltd | Information & communication | 2018 |
| French Health Ltd | Health & social care | 2020 |
| French Hoos Consulting Ltd | Professional & scientific | 2020 |
| French Hoos Limited | Financial services | 2014 |
| Frenwood Properties Ltd | Real estate | 2024 |
| Fresh Health Solutions Limited | Health & social care | 2007 |
| Fresh Pizza Time Ltd | Hospitality | 2024 |
| Freshfields Fruit Ltd | Agriculture & fishing | 2013 |
| Friendly Dragons Education Ltd | Education | 2026 |
| Friends of Castle Green C.I.C. | Other services | 2008 |
| Frijske Limited | Wholesale & retail | 2022 |
| Frome Court Management Limited | Households | 2004 |
| Fromthefirst Ltd | Wholesale & retail | 2026 |
| Front Five Property Limited | Other services | 2023 |
| Frontier Facilities Management Ltd | Administrative & support | 2023 |
| Frontier Film Projects Ltd | Extraterritorial | 2017 |
| Frontline Consults Limited | Health & social care | 2024 |
| Frontline Contracting Limited | Construction | 2001 |
| Fryers Gate (Hereford) Limited | Construction | 2015 |
| FTP Ecocoffins Ltd | Manufacturing | 2001 |
| FTS Sports Publishing Ltd | Information & communication | 2024 |
| Fugue Visions Limited | Education | 2014 |
| Full Houze Ltd | Real estate | 2021 |
| Fullswingcomps Limited | Wholesale & retail | 2025 |
| Fulltime Consultants Limited | Education | 1999 |
| Funkey Maths Limited | Information & communication | 2016 |
| Furkan 12 Limited | Hospitality | 2025 |
| Fusion Community Initiatives Limited | Professional & scientific | 2016 |
| Fusion Intelligence Ltd | Administrative & support | 2026 |
| Futsal Futures Ltd | Arts & recreation | 2017 |
| Futures HFD Ltd | Health & social care | 2019 |
| Fuza Limited | Information & communication | 2014 |
| Fuzzypegs Ltd | Education | 2025 |
| FV Investments Limited | Real estate | 2016 |
| FW Design & Development Group Ltd | Real estate | 2026 |