| Fish Kids Limited | Health & social care | 2017 |
| Fish Leisure Limited | Arts & recreation | 2019 |
| Fisher Contract Services Limited | Construction | 2026 |
| Fisher Estates Limited | Real estate | 2022 |
| Fisher Plant Limited | Construction | 2026 |
| Fishergate Hill Property Limited | Real estate | 2019 |
| Fishpond Energy Limited | Energy | 2015 |
| Fit OUT Gym Installations Limited | Manufacturing | 2024 |
| Fit OUT Gym Solutions Limited | Wholesale & retail | 2022 |
| Fitch Group Limited | Financial services | 2024 |
| Fitness Masters Limited | Arts & recreation | 2016 |
| Fitness Matters Limited | Other services | 2010 |
| Fitsat Limited | Manufacturing | 2008 |
| Fitvisual Ltd | Arts & recreation | 2018 |
| Fitz&Knox Limited | Real estate | 2023 |
| Fitzhugh Legal Services Limited | Professional & scientific | 2023 |
| Fitzpatrick Midgley LLP | | 2017 |
| Fitzroy Capabilities Limited | Wholesale & retail | 2017 |
| Fitzroy Exports Ltd | Wholesale & retail | 2024 |
| Fitzroy Manufacturing Ltd | Manufacturing | 2024 |
| Five Co Property Limited | Hospitality | 2020 |
| Five Directions Limited | Construction | 2012 |
| Five Star Electrical Services Limited | Construction | 1998 |
| Five-O Bespoke Interiors Ltd | Manufacturing | 2026 |
| FIVE13 Limited | Real estate | 2009 |
| Fivestarpropertysourcing Limited | Households | 2026 |
| FIX First Maintenance Ltd | Construction | 2022 |
| FIX247 Holdings Limited | Extraterritorial | 2018 |
| FIX247 Limited | Wholesale & retail | 2009 |
| Flagseller Limited | Wholesale & retail | 2021 |
| Flair Cleaning Services Ltd | Administrative & support | 2023 |
| Flames Gril Limited | Hospitality | 2019 |
| Flames Grill Whitby Ltd | Hospitality | 2024 |
| Flashback Industries Limited | Wholesale & retail | 2026 |
| Flaskwind Limited | Hospitality | 2006 |
| Flat Pack Wezard Ltd | Other services | 2024 |
| Flatcable Holdings Limited | Administrative & support | 2021 |
| Flatcable Limited | Administrative & support | 2004 |
| Flatplane Automotive Group Ltd | Information & communication | 2026 |
| Flats 1-14 Veale Drive Management Company Limited | Administrative & support | 2007 |
| Flaxmode Limited | Real estate | 1997 |
| Flear Limited | Financial services | 2013 |
| Flecto Limited | Information & communication | 2020 |
| Fleet Caravans Limited | Administrative & support | 1956 |
| Fleet Components Limited | Wholesale & retail | 2018 |
| Fletwood Limited | Professional & scientific | 2002 |
| Fletwood Trading Limited | Professional & scientific | 2002 |
| Flexiglide Limited | Extraterritorial | 2019 |
| Flexischedule Limited | Information & communication | 2025 |
| Flightform (Edinburgh) Limited | Extraterritorial | 2000 |
| Flightform Limited | Extraterritorial | 1991 |
| Flightform UK Limited | Extraterritorial | 1997 |
| Flintmanor Limited | Wholesale & retail | 1988 |
| Flit Solar Park Limited | Energy | 2013 |
| Floatkinson Ltd | Arts & recreation | 2025 |
| Flood Control (Holdings) Limited | Construction | 2010 |
| Flood Control Limited | Extraterritorial | 2014 |
| Flood Ready CIC | Professional & scientific | 2026 |
| Floodgen Ltd | Professional & scientific | 2023 |
| Floofs & Doodles Ltd | Other services | 2026 |
| Flooring Finesse Ltd | Wholesale & retail | 2023 |
| Floorwarming (UK) Limited | Professional & scientific | 2006 |
| Florence Maye Ltd | Professional & scientific | 2023 |
| Florence Rose Accommodation Limited | Hospitality | 2021 |
| Floresco Consulting Ltd | Professional & scientific | 2018 |
| Flourish Residential Care Ltd | Health & social care | 2026 |
| Flow and Fuel Ltd | Arts & recreation | 2025 |
| Flow Cabs Ltd | Transport & logistics | 2026 |
| FLOW7FX Ltd | Information & communication | 2026 |
| Flow: EXE River Orchard CIC | Other services | 2020 |
| Flower Productions Ltd | Information & communication | 2020 |
| Fluffington Haven Ltd | Real estate | 2026 |
| Fluvio Ltd | Professional & scientific | 2025 |
| FLY 1ST Limited | Professional & scientific | 2005 |
| FLY Parks (Exeter) Limited | Other services | 2006 |
| Flynn Product Design Ltd | Professional & scientific | 2007 |
| Flywheel House Limited | Arts & recreation | 2024 |
| FMA Trading Limited | Administrative & support | 2011 |
| FMM Trans Limited | Wholesale & retail | 2020 |
| Foat & Griffin Garden Design Limited | Administrative & support | 2022 |
| Focus Barber Ltd | Other services | 2022 |
| Focus Medical Equipment Hire Limited | Administrative & support | 2008 |
| Focus Medical Services Limited | Health & social care | 2008 |
| Focus Technology Delivery Limited | Information & communication | 2026 |
| Focus Training (SW) Limited | Education | 2009 |
| FOF Ltd | Transport & logistics | 2023 |
| FOG Developments Ltd | Real estate | 2013 |
| Foggy Hollow Forestry Limited | Agriculture & fishing | 2025 |
| Foiling Events Ltd | Transport & logistics | 2022 |
| Fomo Content Marketing Ltd | Professional & scientific | 2022 |
| Fonthill RTM Company Limited | Households | 2009 |
| Food Plus Fresh Market Limited | Wholesale & retail | 2024 |
| Fools Paradise Limited | Arts & recreation | 1999 |
| Football FUN Factory (Community 035) Ltd | Arts & recreation | 2021 |
| Football FUN Factory (Community 099) Limited | Arts & recreation | 2023 |
| Footgolf Devon Ltd | Arts & recreation | 2022 |
| Footgolf Southwest Ltd | Arts & recreation | 2017 |
| Forbans Investment Limited | Other services | 2014 |
| Force Cancer Charity | Health & social care | 2011 |
| Force IT Ltd | Information & communication | 2005 |