| Fibre Telecoms (UK) Ltd | Information & communication | 2018 |
| Fibrebit Ltd | Information & communication | 2023 |
| Fidato Fleet Concierge Ltd | Administrative & support | 2025 |
| Fidelity Business Support Ltd | Administrative & support | 2019 |
| Fides N.D.T Services Ltd | Professional & scientific | 2018 |
| Field Motors Limited | Wholesale & retail | 2004 |
| Field Place (Faversham) Management Company Limited | Professional & scientific | 2002 |
| Fieldgrove Ltd | Real estate | 2024 |
| Fields Performance Ltd | Wholesale & retail | 2024 |
| Fieldtech Installation Services Ltd | Construction | 2024 |
| Fierceneutral Limited | Hospitality | 1986 |
| Fiesta FM CIC | Information & communication | 2014 |
| Fifi Service Ltd | Transport & logistics | 2019 |
| Fiftyz Limited | Hospitality | 2025 |
| Figgins Construction Ltd | Construction | 2015 |
| Figgins Property Management Limited | Real estate | 2024 |
| Fight Easy Limited | Wholesale & retail | 2026 |
| Figuresfit Limited | Professional & scientific | 2010 |
| FIL at Home Ltd | Hospitality | 2024 |
| Filgate Tiling Limited | Construction | 2010 |
| Filltrate Ltd | Water & waste | 2024 |
| Film Crew 4U CIC | Information & communication | 2020 |
| Film Expo South Limited | Information & communication | 2015 |
| Fils Pajeros Ltd | Wholesale & retail | 2010 |
| Filskit Theatre Ltd | Arts & recreation | 2020 |
| Fima Digital Ltd | Information & communication | 2013 |
| Finacent Ltd. | Real estate | 2020 |
| Final Words UK Limited | Other services | 2023 |
| Financeworks Plus Ltd | Information & communication | 2023 |
| Financial Recruitment Limited | Extraterritorial | 1996 |
| Financial Temps Limited | Extraterritorial | 1997 |
| Finch Nash Ltd | Hospitality | 2025 |
| Find a Race Ltd | Information & communication | 2011 |
| Find Your House Ltd | Other services | 2016 |
| Findens Farm Livery LLP | | 2025 |
| Findmymove Ltd | Information & communication | 2026 |
| Findmyuni Ltd | Education | 2024 |
| Fine Lion Productions Ltd | Administrative & support | 2024 |
| Fineshade Management (Canford Cliffs) Limited | Households | 1984 |
| Finesse Innovations. Limited | Construction | 2025 |
| Finest Wood Fuels Ltd | Manufacturing | 2014 |
| Finiglas Ltd | Information & communication | 2023 |
| Finite Financial Limited | Professional & scientific | 2011 |
| Finkk Limited | Manufacturing | 2007 |
| Finley & Layla Holdings Ltd | Wholesale & retail | 2023 |
| Finley Bathrooms Ltd | Wholesale & retail | 2018 |
| Finngaill Marine Services Ltd | Education | 2021 |
| Finsbury Medicolegal Services Limited | Health & social care | 2026 |
| Finux Ltd | Administrative & support | 2022 |
| Fionas Academy Ltd | Information & communication | 2025 |
| Fiorentino Property Limited | Real estate | 2024 |
| Fiorentino Ventures Limited | Real estate | 2014 |
| Firaz Traditional Barber Ltd | Other services | 2026 |
| Firbanks PC Maintenance Limited | Information & communication | 2003 |
| Fire and Security Technicians Ltd | Administrative & support | 2022 |
| Fire Flair Direct Limited | Wholesale & retail | 2025 |
| Fire Horse Ltd | Information & communication | 2026 |
| Fire Hospitality Ltd | Administrative & support | 2018 |
| Firebrand Internet Limited | Information & communication | 2013 |
| Fireflies Netball CIC | Education | 2026 |
| Firefly Office Supplies Limited | Extraterritorial | 2006 |
| Fireseeker Ltd | Wholesale & retail | 2025 |
| Firetto Holdings Ltd | Real estate | 2026 |
| Firgrove Development Projects Ltd | Construction | 2025 |
| Firgrove Group Ltd | Financial services | 2020 |
| Firgrove Holdings Limited | Financial services | 2015 |
| Firgrove PM Limited | Construction | 2026 |
| Firm Move Ltd | Other services | 2003 |
| Firozeh and Co Ltd | Hospitality | 2019 |
| First 4 Fire Ltd | Public administration | 2003 |
| First Alliance Properties (Fareham Reach NO. 3) LLP | | 2006 |
| First Alliance Properties (Investment) Limited | Real estate | 2003 |
| First Alliance Properties Limited | Real estate | 2001 |
| First Beds Limited | Wholesale & retail | 2005 |
| First Call Removal Limited | Water & waste | 2015 |
| First Catering Ltd | Hospitality | 2024 |
| First Century Productions Limited | Information & communication | 2012 |
| First Choice Gourmet Foods Limited | Hospitality | 1999 |
| First Choice Oral & Maxillofacial Limited | Health & social care | 2020 |
| First Choice Recruitment (South) Limited | Administrative & support | 2011 |
| First City Nursing Services Limited | Health & social care | 1999 |
| First Class Inventories Limited | Administrative & support | 2021 |
| First Class Removals Limited | Transport & logistics | 2016 |
| First Class Sailing Limited | Arts & recreation | 2005 |
| First Class Southampton Limited | Real estate | 2013 |
| First for Support Limited | Administrative & support | 2019 |
| First Harborough Residents Association (Winchester) Limited | Hospitality | 1979 |
| First Impressions Denture Centre Ltd | Manufacturing | 2012 |
| First Landed Limited | Real estate | 2026 |
| First Light Consulting Services Ltd | Information & communication | 2021 |
| First Marine (Solent) Ltd | Manufacturing | 2005 |
| First Mechanical & Compliance Services Ltd | Construction | 2021 |
| First Plus Education Technology Company Ltd | Education | 2017 |
| First Serve Productions Limited | Information & communication | 2018 |
| First Stop Security Limited | Administrative & support | 2006 |
| First Time Cars South Ltd | Wholesale & retail | 2025 |
| First Time Solutions Ltd | Construction | 2023 |
| Firstaway Yacht Charters Ltd | Arts & recreation | 2019 |
| Firstmere Ltd | Financial services | 2017 |
| Firth Marine Limited | Other services | 2012 |