| Fast FIX UK Limited | Manufacturing | 1999 |
| Fast Heat GAS Services Ltd | Manufacturing | 2016 |
| Fast Hot Feast Ltd | Hospitality | 2025 |
| Fast Track Financial Services Limited | Financial services | 2001 |
| Fasterbuild Ltd | Wholesale & retail | 2026 |
| Fastlane Couriers Limited | Transport & logistics | 2025 |
| Fastlease Properties Ltd | Real estate | 2024 |
| FAT BOY Audio Limited | Professional & scientific | 2019 |
| FAT Panda Marketing Limited | Professional & scientific | 2011 |
| Fatima Samu Ltd | Wholesale & retail | 2025 |
| Fatwax Kreatif Medya Ltd | Information & communication | 2026 |
| Fazeel Trading Ltd | Wholesale & retail | 2021 |
| Fazima Limited | Wholesale & retail | 2025 |
| FB Heating and Plumbing Limited | Construction | 2024 |
| FBS Ramsbottom Ltd | Hospitality | 2024 |
| FCC First Class Consulting Ltd. | Information & communication | 2013 |
| FD Vision Ltd | Professional & scientific | 2015 |
| FDM by UAP Limited | Wholesale & retail | 2002 |
| FDP Food Retail Limited | Wholesale & retail | 2021 |
| FDZ Barber Ltd | Other services | 2025 |
| FDZ Properties Ltd | Real estate | 2025 |
| Featherstone Publishing Ltd | Information & communication | 2021 |
| Feet Covered Limited | Health & social care | 2011 |
| Felix Advisory Limited | Professional & scientific | 2014 |
| Fellfin Limited | Financial services | 2021 |
| Fencelock Security Systems Limited | Construction | 2003 |
| Fenster Bifold Limited | Extraterritorial | 2012 |
| Fenster Trade Frames Limited | Construction | 1993 |
| Fenton Seal Limited | Administrative & support | 2003 |
| Fenwell Properties Limited | Real estate | 1982 |
| Ferina Projects Ltd | Construction | 2025 |
| Fern and Flow Wellness Ltd | Other services | 2024 |
| Fern Common Management Company Limited | Households | 2004 |
| Fern Engineering Limited | Wholesale & retail | 2018 |
| Fernhill Motors Ltd | Wholesale & retail | 2025 |
| Ferris Wheel Hire Company Ltd | Arts & recreation | 2026 |
| Fest Events Company Ltd | Hospitality | 2019 |
| FFA International Ltd | Other services | 2022 |
| FG Property Group Limited | Real estate | 2024 |
| FG802 Limited | Administrative & support | 2025 |
| FGA Contracting Ltd | Professional & scientific | 2015 |
| FGA Projects Ltd | Construction | 2021 |
| FH 1 Ltd | Construction | 2019 |
| Fibertek U.K. Limited | Extraterritorial | 1997 |
| Field Service Solutions Ltd | Manufacturing | 2016 |
| Field Street Stores Ltd | Administrative & support | 2017 |
| Fieldcrest Holding Ltd | Wholesale & retail | 2026 |
| Fieldhouse Home Ltd | Health & social care | 2022 |
| Fifi's Hair Parlour & Healthcare Services Ltd | Other services | 2017 |
| Fika Holdings (NW) Ltd | Construction | 2025 |
| Fiksa Ltd | Information & communication | 2017 |
| Filbeys Barbers Ltd | Other services | 2023 |
| File.Digital Ltd | Information & communication | 2014 |
| Filfyrich Limited | Wholesale & retail | 2021 |
| Filo Enterprises Ltd | Financial services | 2008 |
| Filter Services Limited | Manufacturing | 1982 |
| Finance International Group PLC | Information & communication | 2021 |
| Financesector Limited | Professional & scientific | 1994 |
| Financial Options Group Foundation Limited | Health & social care | 2018 |
| Financial Options Wealth Management Limited | Financial services | 2011 |
| Finematic Limited | Manufacturing | 1987 |
| Fineturret Holdings Limited | Financial services | 2025 |
| Fineturret Limited | Construction | 1975 |
| Fingershield East Ltd | Wholesale & retail | 2018 |
| Finishing Techniques Group Limited | Professional & scientific | 2022 |
| Finishing Techniques Limited | Professional & scientific | 1981 |
| Finney's Service and M.O.T. Centre Limited | Wholesale & retail | 2006 |
| Finnlor Properties Limited | Real estate | 2001 |
| Finservsolutions Ltd | Financial services | 2014 |
| Fiona Robinson Ltd | Education | 2020 |
| Fire Door Association | Other services | 2025 |
| Fire Door Safety Audits Ltd | Public administration | 2022 |
| Fire Extinguishers (Rentals) Limited | Manufacturing | 1958 |
| Fire Safe Facade Consulting Limited | Public administration | 2017 |
| Firebird Industries Ltd | Wholesale & retail | 2024 |
| Firecomply Ltd | Other services | 2006 |
| Fired Paint a POT Cafe Limited | Wholesale & retail | 2018 |
| Firefly Electrics & Builders Ltd | Construction | 2021 |
| Firesafe Dryrisers Limited | Construction | 2019 |
| First Choice Construction BL9 Limited | Construction | 2019 |
| First Choice Continental Food Cash and Carry Limited | Real estate | 1998 |
| First Choice Exec Solutions Limited | Administrative & support | 2015 |
| First Choice Groundworks & Civils Limited | Construction | 2016 |
| First Choice INT Traders Ltd | Wholesale & retail | 2026 |
| First Football Coaching Academy Ltd | Arts & recreation | 2020 |
| First Logistics 1998 Holdings Limited | Financial services | 2017 |
| First Logistics 1998 Limited | Administrative & support | 2007 |
| First Operation Ltd | Wholesale & retail | 2022 |
| First Point Family Support Services Ltd | Other services | 2012 |
| First Priority Healthcare Limited | Administrative & support | 2023 |
| First Sport Limited | Professional & scientific | 1982 |
| First Step (UK) Limited | Financial services | 2005 |
| First Step Contract Hire and Leasing Limited | Administrative & support | 2022 |
| First Step Debt Support Ltd | Professional & scientific | 2026 |
| First Step Hypnotherapy Limited | Health & social care | 2024 |
| First Step Rentals Limited | Administrative & support | 2009 |
| First Step to Independence Ltd | Health & social care | 2025 |
| First Step UK (Holdings) Limited | Administrative & support | 2015 |
| Firstmarket Limited | Wholesale & retail | 1997 |
| Firwood Management Limited | Extraterritorial | 2021 |