| Fortis Coaching & Consulting Limited | Professional & scientific | 2014 |
| Fortis Personnel Ltd | Administrative & support | 2025 |
| Fortuna Civils Ltd | Construction | 2024 |
| Fortuna Labori Ltd | Extraterritorial | 2024 |
| Fortuna Property Holdings Ltd | Real estate | 2025 |
| Forward Options Ltd | Real estate | 2025 |
| Forza Supercars Limited | Administrative & support | 2024 |
| Foss Minerals Ltd | Wholesale & retail | 2024 |
| Foster Legal & Limb Reconstruction Limited | Health & social care | 2019 |
| Foundry Housing Ltd | Administrative & support | 2026 |
| Foundry Technology (UK) Ltd | Administrative & support | 2007 |
| Foundry Technology Limited | Manufacturing | 2009 |
| FOX & Goose Inn Limited | Hospitality | 2008 |
| FOX Affiliates Ltd | Professional & scientific | 2026 |
| FOX Electrical & Mechanical Ltd | Construction | 2005 |
| FOX Red Labs Ltd | Agriculture & fishing | 2018 |
| Foxad Ltd | Financial services | 2021 |
| Foxibo Ltd | Information & communication | 2017 |
| FP Holdings Limited | Professional & scientific | 2006 |
| Frame Theory Media Ltd | Administrative & support | 2025 |
| France Financial Ltd | Financial services | 2019 |
| Franci Transport Limited | Transport & logistics | 2017 |
| Francis Chambers and Company Limited | Manufacturing | 2004 |
| Francis Mortin Limited | Professional & scientific | 2020 |
| Frank&Ben Cleaning Company Ltd | Administrative & support | 2025 |
| Fred Wright Limited | Professional & scientific | 2023 |
| Freddys HQ Ltd | Hospitality | 2025 |
| Free Running Buildings Limited | Professional & scientific | 2014 |
| Freedom Home Developments & Plant Hire Ltd | Construction | 2025 |
| Freedom Home Developments Ltd | Construction | 2025 |
| Freedom Renewable Ltd | Construction | 2019 |
| FREEHEAT4SCHOOLS Ltd | Construction | 2018 |
| Freemans Couriers Ltd | Transport & logistics | 2025 |
| Fregon Ltd | Wholesale & retail | 2019 |
| Freight Force Recruitment Ltd | Administrative & support | 2026 |
| Freightma Ltd | Transport & logistics | 2025 |
| French Electrical Contractors Ltd | Construction | 2019 |
| Frere Construction Ltd | Construction | 2025 |
| Fresh Start Cleaning Group Ltd | Administrative & support | 2026 |
| Fresh Start Commercial Cleaners Ltd | Administrative & support | 2024 |
| Freshmans Archive Ltd | Wholesale & retail | 2018 |
| Freudian Smile Ltd | Real estate | 2012 |
| Freya Whittaker Limited | Professional & scientific | 2025 |
| Friendly Domain Services CIC | Health & social care | 2023 |
| Friendlyicare Ltd | Administrative & support | 2023 |
| FRM Cooling Ltd | Manufacturing | 2019 |
| FRM Electrical Contractors Ltd | Construction | 2010 |
| FRM Investments Ltd | Real estate | 2022 |
| Frobisher Grove Ltd | Real estate | 2025 |
| Frogress Ltd | Wholesale & retail | 2016 |
| Fromoco Limited | Hospitality | 2003 |
| Frondon 148 Ltd | Hospitality | 2025 |
| Frool Ltd | Information & communication | 2015 |
| Frost Plant Limited | Professional & scientific | 2003 |
| Frosty Temptations Ltd | Manufacturing | 2025 |
| Frozen Flight Limited | Administrative & support | 2007 |
| Fruitful Ground Limited | Wholesale & retail | 2022 |
| Fruktarbo Limited | Information & communication | 2015 |
| Fruntage Limited | Wholesale & retail | 2004 |
| FSA Developments Ltd | Construction | 2016 |
| FT Mobile Tyre Services Limited | Wholesale & retail | 2024 |
| FT Thrybergh Ltd | Professional & scientific | 2012 |
| Ftrc Ltd | Real estate | 2025 |
| FU Sports Ltd | Wholesale & retail | 2025 |
| Fubar Inns Limited | Hospitality | 2021 |
| Fuel Storage Systems Limited | Professional & scientific | 2017 |
| Fuel Systems UK Ltd | Energy | 2009 |
| Fulcher Corp Ltd | Professional & scientific | 2019 |
| Fulfilify Ltd | Manufacturing | 2024 |
| Full Circle Event Production Ltd | Professional & scientific | 2020 |
| Full Circle Learning Limited | Education | 2010 |
| Full Circle Packaging Limited | Water & waste | 2015 |
| Full Circle Sports Therapy Limited | Other services | 2025 |
| Full House Building Works Ltd | Construction | 2019 |
| Full Moon Transfers Ltd | Wholesale & retail | 2023 |
| Full Rich Limited | Hospitality | 2021 |
| Full Volume Co. UK. Ltd | Wholesale & retail | 2005 |
| Fullers Consultancy Limited | Information & communication | 2023 |
| Fultec Engineering Limited | Professional & scientific | 2006 |
| Fumi Furniture Ltd | Wholesale & retail | 2023 |
| FUN4U2 Limited | Health & social care | 2012 |
| Funclubs Limited | Education | 2013 |
| Functional Fitness Solutions Limited | Arts & recreation | 2013 |
| Fundamental Futures Ltd | Arts & recreation | 2024 |
| Funky Duck Wholesale Ltd | Wholesale & retail | 2025 |
| Funny Moments Ltd | Administrative & support | 2015 |
| Funrade Limited | Health & social care | 2010 |
| Funtasia Limited | Arts & recreation | 2019 |
| Fuoco Ltd | Hospitality | 2025 |
| Furat Day Care Ltd. | Wholesale & retail | 2011 |
| Furat P.O Ltd. | Wholesale & retail | 2012 |
| Furniss Limited | Administrative & support | 2013 |
| Furry PIT Stop Ltd | Other services | 2025 |
| Fury Energy Ltd | Energy | 2020 |
| Fury Gym Ltd | Arts & recreation | 2020 |
| Fury Power Limited | Energy | 2020 |
| Fusha Ltd | Households | 2026 |
| Fusion Metal (UK) Limited | Manufacturing | 2016 |
| Fusion Mortgage Advice Ltd | Financial services | 2023 |
| Fusion Moulds Ltd | Manufacturing | 2024 |