| Fidus Care Ltd | Health & social care | 2023 |
| Fielden Springs Management Limited | Households | 1991 |
| Fieldhouses ABS Limited | Professional & scientific | 2013 |
| Fifth Element PR Limited | Professional & scientific | 2003 |
| Fiftyseven Design Ltd | Professional & scientific | 2018 |
| Fighting Chance Sports Massage Ltd | Other services | 2026 |
| Filin Design and Construction Ltd | Construction | 2017 |
| Filios Ltd | Professional & scientific | 2026 |
| Filmspositive Limited | Information & communication | 2026 |
| Filthy Flamingo Limited | Wholesale & retail | 2016 |
| Filywox Ltd | Information & communication | 2020 |
| Finanzas Consulting Limited | Professional & scientific | 2021 |
| Find Femmes Limited | Other services | 2015 |
| Finding Chewy Ltd | Information & communication | 2018 |
| Finding-X Limited | Information & communication | 2015 |
| Finesse Shipping Ltd. | Transport & logistics | 2016 |
| Finjz Estates Ltd | Real estate | 2025 |
| Finndeli Ltd | Wholesale & retail | 2014 |
| Finnteam Ltd | Extraterritorial | 2009 |
| Finsur Limited | Professional & scientific | 2020 |
| Fire Fade Ltd | Other services | 2023 |
| Fire Forest UK Logistic Ltd | Transport & logistics | 2021 |
| Firesoft Ltd | Information & communication | 2016 |
| Firestation Arts & Culture Community Interest Company | Information & communication | 2008 |
| First Base Properties Ltd | Construction | 2007 |
| First Call Couriers Limited | Other services | 1999 |
| First YOU Limited | Professional & scientific | 2023 |
| Fish Investments Ltd | Professional & scientific | 2019 |
| FIT4IT Coaching Limited | Arts & recreation | 2016 |
| Fitzgeorge Properties Limited | Real estate | 2018 |
| Five Farthings Limited | Hospitality | 1992 |
| Five Investment Properties Ltd | Real estate | 2025 |
| Five Seven SIX Limited | Financial services | 2004 |
| Five SIX Productions Ltd | Arts & recreation | 2025 |
| Five Star Corporate Cars Limited | Transport & logistics | 2010 |
| Five-Star Guesthouse Ltd | Hospitality | 2015 |
| Fizz Wheels Ltd | Hospitality | 2024 |
| Flame Heating Ltd | Construction | 2020 |
| Flame Lily Arts Ltd. | Arts & recreation | 2012 |
| Flaming Flamingo Ltd | Professional & scientific | 2024 |
| Flash Carz Ltd | Wholesale & retail | 2025 |
| Flaxman Fine Jewellery Ltd | Wholesale & retail | 2022 |
| Fletcher Brown Ltd | Real estate | 2014 |
| Fletcher People Projects Ltd | Administrative & support | 2024 |
| Fleur House Limited | Construction | 2026 |
| Flightpath Music Holdings Limited | Arts & recreation | 2023 |
| Flippad Limited | Professional & scientific | 2013 |
| Flippin Limited | Real estate | 2023 |
| Floatdene Systems Limited | Professional & scientific | 1997 |
| Flow Designs Ltd | Construction | 2024 |
| Flowersforthepeople Ltd | Wholesale & retail | 2018 |
| Flowvex Ltd | Manufacturing | 2024 |
| FLU Xpress Ltd | Administrative & support | 2010 |
| FM Sales Solutions Ltd | Administrative & support | 2022 |
| Focal Collective UK Ltd | Administrative & support | 2026 |
| Fold and Fill Limited | Hospitality | 2023 |
| Foley Place (Farnham) Management Company Limited | Households | 2019 |
| Foliostax Limited | Information & communication | 2026 |
| Fones R US Limited | Wholesale & retail | 2015 |
| Fonfe Talent Ltd | Arts & recreation | 2023 |
| Fonty Properties Ltd | Real estate | 2020 |
| Fonz Enterprises Limited | Professional & scientific | 2017 |
| Food Vybez Ltd | Hospitality | 2024 |
| Foot & Ankle Specialist Limited | Health & social care | 2016 |
| Footprints Support Ltd | Professional & scientific | 2018 |
| Forge Digital Systems Ltd | Information & communication | 2026 |
| Formost Ltd | Real estate | 2024 |
| Forrest IT Services Limited | Information & communication | 2022 |
| Forrest Property Management Limited | Real estate | 2022 |
| Fortress Europe Limited | Construction | 2012 |
| Fortune's Quest Ltd | Administrative & support | 2015 |
| Foundry 3 Ltd | Professional & scientific | 2018 |
| Foundry 3 Trustee Limited | Extraterritorial | 2024 |
| Fourfront Group Limited | Financial services | 2006 |
| Fourfront Holdings Limited | Financial services | 2016 |
| Fowey River Retreats Ltd | Real estate | 2021 |
| FOX Sake Limited | Real estate | 2023 |
| Foxley Talent Ltd | Administrative & support | 2021 |
| FR Group Investments Ltd | Other services | 2018 |
| Framing Castle.W Limited | Wholesale & retail | 2024 |
| Francob Limited | Hospitality | 2016 |
| Francobeni Ltd | Real estate | 2017 |
| Fraser Ward Ltd. | Professional & scientific | 2012 |
| FRC Star Group Bidco Limited | Financial services | 2017 |
| FRC Star Group Holdings Limited | Financial services | 2017 |
| FRC Star Group Parent Limited | Financial services | 2017 |
| FRC Star Group Topco Limited | Financial services | 2017 |
| Frederick Place Management Company Limited | Households | 2006 |
| Freedom Attire Limited | Wholesale & retail | 2011 |
| Freedomnet Ltd | Construction | 2026 |
| Freehold 66 Hencroft Street South SL11RE Limited | Households | 2019 |
| Freeman Films & Television Ltd | Information & communication | 2017 |
| Freer Crescent Residents Management Company Limited | Households | 2006 |
| Freestone-Walker Communications Ltd | Professional & scientific | 2018 |
| French Crew UK Consulting Ltd | Professional & scientific | 2016 |
| Fresh Accounts Limited | Professional & scientific | 2021 |
| Fresh Beauty Limited | Manufacturing | 2023 |
| Fresh Domestics Ltd. | Other services | 2013 |
| Freshfield Court (Watford) Management Company Limited | Households | 2004 |
| Fridge Fresh Productions Ltd | Information & communication | 2023 |