| Fortek Systems Ltd | Manufacturing | 2025 |
| Forthstar Development Limited | Information & communication | 2024 |
| Forthstar Limited | Information & communication | 2023 |
| Fortis Commercial Holdings Limited | Real estate | 2016 |
| Fortis Land Ltd | Real estate | 2018 |
| Fortis Management Company Ltd | Real estate | 2013 |
| Fortra International Group Limited | Information & communication | 2004 |
| Fortra International Limited | Information & communication | 2001 |
| Fortress Property Group Ltd | Real estate | 2015 |
| Fortyashburner Properties Limited | Real estate | 2021 |
| Fortyfortyfive Investments | Financial services | 2025 |
| Fortyseven Consulting Ltd | Professional & scientific | 2025 |
| Forward IQ Limited | Administrative & support | 2025 |
| Foss Limited | Real estate | 2015 |
| Fosshey Stud Ltd | Agriculture & fishing | 2010 |
| Foundation Flooring Solutions Limited | Construction | 2026 |
| Foundation Investment Management Limited | Financial services | 2012 |
| Foundry Finance Limited | Professional & scientific | 2024 |
| Foundry Sourcing Ltd | Wholesale & retail | 2020 |
| Foundry Yard Limited | Households | 1999 |
| Fountain Plants Limited | Agriculture & fishing | 2007 |
| Four Hills Equestrian Ltd | Wholesale & retail | 2024 |
| Four Rainbows Advisory Limited | Financial services | 2026 |
| Four Seasons Grounds Maintenance & Landscape Services Ltd | Administrative & support | 2018 |
| Four Sights Consultancy Services Ltd | Professional & scientific | 2026 |
| FOX Aerospace Engineering Limited | Professional & scientific | 2023 |
| FOX Crown Properties Limited | Real estate | 2021 |
| FOX Fabrication & Construction Limited | Construction | 2005 |
| FOX Project Services Limited | Professional & scientific | 2023 |
| FOX Styling Opticians Limited | Health & social care | 2023 |
| Fox-Stevens Optometrists Limited | Health & social care | 2010 |
| Foxable Solutions Limited | Professional & scientific | 2022 |
| Foxhound Tech Limited | Administrative & support | 2021 |
| Foxmay One Ltd | Real estate | 2025 |
| Foxmay Two Ltd | Real estate | 2025 |
| FPI Claims Limited | Extraterritorial | 2022 |
| FQ 4 Management Ltd | Households | 2012 |
| FR Pharm Limited | Health & social care | 2011 |
| Fraggly Red Security Limited | Administrative & support | 2026 |
| Framed & Focused Limited | Information & communication | 2020 |
| Frameplay UK Subsidiary Limited | Information & communication | 2022 |
| Francekirk Ltd | Hospitality | 2009 |
| Francesca Lewis Opticians Limited | Health & social care | 2008 |
| Francs Event Catering Ltd | Hospitality | 2019 |
| Frank Innes Countrywide Limited | Professional & scientific | 2004 |
| Frankdtank Limited | Real estate | 2024 |
| Frankie and TOM Ltd | Wholesale & retail | 2021 |
| Frankland Tree Services Limited | Agriculture & fishing | 2003 |
| Franklin Partners Limited | Professional & scientific | 2024 |
| Fraser Family Invesco Limited | Real estate | 2022 |
| Fraser Homes Gatekeeper Limited | Construction | 2025 |
| Fraser Land Holdco Limited | Financial services | 2022 |
| Fraser Residential Lettings Limited | Real estate | 2024 |
| Fraser Tradeco Limited | Financial services | 2023 |
| Frazer James Consulting Limited | Administrative & support | 2026 |
| Frazier Labs Ltd | Information & communication | 2021 |
| Frederick Court Management Company Limited | Households | 2007 |
| Frederick James Consulting Limited | Professional & scientific | 2020 |
| Frederick Thomas Electrical and Maintenance Limited | Construction | 1998 |
| Frederick Thomas Limited | Professional & scientific | 2015 |
| Free Space Solutions Limited | Real estate | 2020 |
| Freedom Organics Limited | Hospitality | 2018 |
| Freedom Property Developments Limited | Real estate | 2022 |
| Freedom Telephony Limited | Information & communication | 2023 |
| Freeflow Ducted Systems Limited | Professional & scientific | 2004 |
| Freemac Civil Engineering Limited | Construction | 2018 |
| Freeman Forman Limited | Professional & scientific | 2003 |
| Freeman Management Ltd | Extraterritorial | 2014 |
| Freeman Mchale Ltd | Information & communication | 2018 |
| Freesias Leather Goods Ltd | Wholesale & retail | 2024 |
| Freeway Cleaning Services Ltd | Administrative & support | 2021 |
| Freezehold Legal Limited | Professional & scientific | 2018 |
| French Cactus Ltd | Hospitality | 2018 |
| Fresh 5 Limited | Hospitality | 2010 |
| Fresh Design Base Limited | Information & communication | 2008 |
| Fresh Homes Group Ltd | Real estate | 2019 |
| Fresh Orange Productions Holdings Limited | Financial services | 2025 |
| Fresh Orange Productions Ltd | Information & communication | 2023 |
| Fresh X Pizza Ltd | Hospitality | 2025 |
| Friedman's Limited | Wholesale & retail | 1964 |
| Frites Catering Limited | Wholesale & retail | 2024 |
| Frodingham Management Services Limited | Other services | 2014 |
| Frogbox and Friends Ltd | Wholesale & retail | 2021 |
| Frolly Consulting Limited | Administrative & support | 2008 |
| Frontera Holding Company Ltd. | Information & communication | 2025 |
| Frontier Computing Ltd | Professional & scientific | 2026 |
| Frontline Image Ltd | Manufacturing | 1997 |
| Frosty Meadows Ltd | Professional & scientific | 2026 |
| Frozen Mountain Ltd | Hospitality | 2020 |
| FS Litigation Solicitors LLP | | 2025 |
| FSH Medical Limited | Health & social care | 2022 |
| Fsir Holdings (UK) Limited | Professional & scientific | 2004 |
| Fsuk Holdings Limited | Professional & scientific | 2004 |
| FTE & M Limited | Administrative & support | 2012 |
| Fueled Limited | Arts & recreation | 2012 |
| FULFILMENT4U Ltd | Transport & logistics | 2025 |
| Fulfords Estate Agents Limited | Professional & scientific | 2002 |
| Full Circle Barbers Ltd | Other services | 2022 |
| Full Frontal Theatre Ltd | Arts & recreation | 2024 |
| Function Health Europe UK Limited | Health & social care | 2023 |