| Fitfor.Business Limited | Extraterritorial | 2016 |
| Fitness Savvy Limited | Wholesale & retail | 2018 |
| Fitpoint Ltd | Professional & scientific | 2023 |
| Five ST Ann's Court Ltd | Real estate | 2017 |
| Fiwick Consultants Ltd | Professional & scientific | 2021 |
| Flame 'N Co Ltd | Hospitality | 2019 |
| Flavor 988 Limited | Hospitality | 2023 |
| Flavourstack Ltd | Manufacturing | 2025 |
| Fleetworx Ltd | Professional & scientific | 2005 |
| Flex ABL Limited | Financial services | 2005 |
| Flexabl Financial Services Limited | Financial services | 2020 |
| Flexibility Technologies Limited | Financial services | 2023 |
| Flight Path Training Services Limited | Education | 2016 |
| Flint Hall Farm Management Company Ltd | Households | 2012 |
| Flora & Finn Limited | Professional & scientific | 2017 |
| Flora Nails Limited | Other services | 2025 |
| Florea Garden Ltd | Wholesale & retail | 2025 |
| Flouri Limited | Administrative & support | 2021 |
| Flourishing Soul Ltd | Health & social care | 2024 |
| Flowers to Go (UK) Limited | Wholesale & retail | 2010 |
| Flowscape Technology Ltd | Extraterritorial | 2019 |
| Flusso Collection Limited | Wholesale & retail | 2025 |
| Flux Aviation Limited | Professional & scientific | 2021 |
| Flying PIG Catering Ltd | Hospitality | 2019 |
| FM Sure Limited | Administrative & support | 2023 |
| FMA Tactical Ltd | Education | 2017 |
| Focus Grow Progress Limited | Professional & scientific | 2025 |
| Focused Rehab Ltd | Health & social care | 2007 |
| Foley Signature Stays Ltd | Real estate | 2025 |
| Folkeswagon Ltd | Professional & scientific | 2026 |
| Follett Contracts Ltd | Administrative & support | 2018 |
| Fontwell Field (West Sussex) Ltd | Construction | 2023 |
| Food on the FLY Limited | Hospitality | 2025 |
| Football Shirt & Print Co Ltd | Wholesale & retail | 2024 |
| FOR the Love of Pies Ltd | Manufacturing | 2023 |
| Forcecare Limited | Construction | 1996 |
| Forenteq Limited | Professional & scientific | 2015 |
| Foresight Technologies Ltd | Professional & scientific | 2023 |
| Form and Flow Ltd | Other services | 2021 |
| Form Costume Limited | Wholesale & retail | 2024 |
| Format Limited | Information & communication | 2022 |
| Formation Media Ltd | Manufacturing | 2006 |
| Fortdale Black Lion Limited | Real estate | 2007 |
| Fortis Professional Ltd | Wholesale & retail | 2025 |
| Fortress Recycling and Resource Management Ltd | Water & waste | 1986 |
| Fortune 25 Ltd | Health & social care | 2025 |
| Forty-Six Consulting Ltd | Professional & scientific | 2024 |
| Forum Court Limited | Households | 1995 |
| Fosse Multi Academy Trust | Education | 2021 |
| Foundry Gym JSA Ltd | Arts & recreation | 2024 |
| Fowles Communications Ltd | Information & communication | 2015 |
| FOX Functions Limited | Hospitality | 2019 |
| Foxbrook Wealth Management Limited | Financial services | 2015 |
| FP Rose Estates Ltd | Real estate | 2024 |
| FRAN64 Ltd | Wholesale & retail | 2025 |
| Franklin John Limited | Professional & scientific | 2013 |
| Franklin Vale Limited | Construction | 2018 |
| Frankly Vera Holdings Limited | Real estate | 2024 |
| Frankton Hill Limited | Professional & scientific | 2010 |
| Frdm Drinks Limited | Manufacturing | 2021 |
| Fred Hutsby Farms Limited | Agriculture & fishing | 2021 |
| Fred Winter Farms Limited | Agriculture & fishing | 2013 |
| Fred Winter Group Limited | Financial services | 2013 |
| Fred Winter,Limited | Wholesale & retail | 1925 |
| Freedom Nurseries Limited | Wholesale & retail | 2006 |
| Freestone & Ware Limited | Professional & scientific | 2002 |
| Fresh FEZ Limited | Hospitality | 2024 |
| Fresh Innovation Ltd | Wholesale & retail | 2012 |
| Friday Night Giveaways Ltd | Wholesale & retail | 2025 |
| Friends of Myton Pool Trust Limited | Arts & recreation | 2009 |
| Frijapp Limited | Information & communication | 2010 |
| Frontier Knowledge Labs Limited | Professional & scientific | 2026 |
| Frontier Power International Limited | Professional & scientific | 2017 |
| Frontier Power Limited | Energy | 2009 |
| Frontier Power Management Services Limited | Energy | 2025 |
| Frontier Power Services Limited | Energy | 2009 |
| Frontier Power Ventures Holdco Limited | Energy | 2025 |
| Frontline Safety Training Ltd | Public administration | 2025 |
| FRY and Cavell Limited | Hospitality | 2007 |
| FT Therapy Rooms Ltd | Real estate | 2026 |
| FTS Storage Ltd | Transport & logistics | 2026 |
| FTX Consultants Limited | Professional & scientific | 2014 |
| FU Hong Limited | Hospitality | 2022 |
| Fuelstop Nutrition Ltd | Manufacturing | 2021 |
| Fuelwood (Warwick) Limited | Manufacturing | 1997 |
| Fulchester Consultants Ltd | Other services | 2024 |
| Full Circle Land & Development Limited | Construction | 2015 |
| Full FAT Productions Limited | Information & communication | 1996 |
| Full Throttle Motorcycles Limited | Wholesale & retail | 2009 |
| Full.E Ltd | Professional & scientific | 2014 |
| Fullerton Court Limited | Households | 1998 |
| Fulong Welcome Ltd | Hospitality | 2023 |
| FUN Fest Franchising (UK) Limited | Administrative & support | 2014 |
| Function Therapy Ltd | Other services | 2025 |
| Fury’S Law Ltd | Administrative & support | 2026 |
| Future Hunter Limited | Financial services | 2021 |
| Future Properties 4 U Limited | Real estate | 2017 |
| Future Vision Diagnostic Imaging Limited | Professional & scientific | 2014 |
| Futuresafe Solutions Ltd | Professional & scientific | 2026 |
| Futurise Limited | Professional & scientific | 2016 |