| Four Winds Management Company Limited | Households | 1983 |
| Fourteen Drops Ltd | Wholesale & retail | 2026 |
| Fowlers Fastfit Ltd | Wholesale & retail | 2025 |
| Foxdriving Ltd | Transport & logistics | 2026 |
| Foxton Wood Services Limited | Other services | 2024 |
| Foxu Limited | Wholesale & retail | 2025 |
| Foxwood Consulting Ltd | Administrative & support | 2025 |
| FP Property Ltd | Real estate | 2019 |
| FPP Benefits Group Limited | Manufacturing | 2017 |
| FPP Group Holdings Limited | Professional & scientific | 2020 |
| FR Tees Solutions Ltd | Wholesale & retail | 2018 |
| Fr.Books Ltd | Wholesale & retail | 2025 |
| Frain & Harley Limited | Construction | 2000 |
| Fran Beauty Ltd | Other services | 2026 |
| Franam Holdings Limited | Financial services | 2021 |
| Francs Fancies Ltd | Wholesale & retail | 2025 |
| Franjo Limited | Real estate | 2012 |
| Franklin House Children's Nursery Limited | Education | 2025 |
| Franks Commercials Ltd | Wholesale & retail | 2025 |
| Freakofnatureclothing Ltd | Wholesale & retail | 2023 |
| Fred's Studio Ltd | Administrative & support | 2025 |
| Freecycle UK | Water & waste | 2006 |
| Freelance Professionals Ltd | Administrative & support | 2021 |
| Freement Furniture UK Ltd | Wholesale & retail | 2018 |
| Freflex Limited | Health & social care | 2022 |
| Fresh Approach Finance Ltd | Financial services | 2010 |
| Fresh Choice Mart Ltd | Wholesale & retail | 2023 |
| Fresh Fuels Meals Ltd | Wholesale & retail | 2023 |
| Fresh Skin Medical Limited | Health & social care | 2017 |
| Fresh Start Project CIC | Administrative & support | 2016 |
| Fresh Utilities Limited | Information & communication | 2015 |
| Freya Films Ltd | Information & communication | 2018 |
| From Loft to Loved Limited | Wholesale & retail | 2020 |
| Frostree Limited | Construction | 1981 |
| Frydayz of Shildon Limited | Hospitality | 2019 |
| Fryer Tucks (Stockton) Ltd | Hospitality | 2024 |
| FSC Management Ltd | Financial services | 2024 |
| FTA Repairs Ltd | Construction | 2006 |
| FTB Locations Ltd | Information & communication | 2018 |
| FU5ION Digital Limited | Other services | 2023 |
| Fulcran Limited | Professional & scientific | 2013 |
| Fulinge Limited | Hospitality | 2018 |
| Full Circle Wealth Management Ltd | Professional & scientific | 2026 |
| Full Frame Pictures Limited | Information & communication | 2022 |
| Full Spectrum Training Ltd | Education | 2025 |
| Full Steam Ahead Theatre Ltd | Arts & recreation | 2025 |
| Functional Safety Engineering (FSE) Limited | Professional & scientific | 2015 |
| Functional Technologies Ltd | Manufacturing | 2024 |
| Funkilicious Cocktails UK Ltd | Hospitality | 2022 |
| Furry Footsteps Ltd | Other services | 2025 |
| Future Arts Centres Ltd | Arts & recreation | 2022 |
| Future Life Producer Ltd | Arts & recreation | 2025 |
| Future Metals Incorporated Ltd | Professional & scientific | 2020 |
| Future Steps Childrens Occupational Therapy Consultancy Ltd. | Education | 2013 |
| Futureforge Ltd | Professional & scientific | 2026 |
| Fuzzy Bridge Ltd | Arts & recreation | 2019 |
| Fuzzy Circle Ltd | Professional & scientific | 2025 |
| FV Roofing and Home Improvements Ltd | Construction | 2025 |
| G & a Rentals Limited | Real estate | 2022 |
| G & a Services NE Limited | Extraterritorial | 2018 |
| G & J Youngman Ltd | Other services | 2018 |
| G & P Properties (NE) Ltd | Real estate | 2021 |
| G & V Miller LLP | | 2024 |
| G a Stadler & Co Limited | Real estate | 1982 |
| G and a Security NE Ltd | Administrative & support | 2013 |
| G and G Landservices Ltd | Administrative & support | 2023 |
| G Bolam Holdings Limited | Real estate | 2024 |
| G Ec&I Services Limited | Construction | 2023 |
| G MAY Property Developments Ltd | Construction | 2009 |
| G N Rayner Ltd | Hospitality | 2005 |
| G Singh Services Ltd | Wholesale & retail | 2022 |
| G U Lifting Ltd | Construction | 2025 |
| G&G Property Developments Ltd | Real estate | 2021 |
| G&G Spedition Limited | Wholesale & retail | 2019 |
| G&I Property Developments Ltd | Real estate | 2023 |
| G&J Legg Ltd | Construction | 2015 |
| G&Jc Mechanical Services Ltd | Professional & scientific | 2025 |
| G&S Global Ltd | Wholesale & retail | 2025 |
| G. E. R. Portable Buildings Limited | Administrative & support | 2003 |
| G. Singh Residential Properties Ltd | Real estate | 2023 |
| G.A. Stadler & Co (1993) Limited | Administrative & support | 1992 |
| G.C.S. Johnson (Skeeby) Limited | Transport & logistics | 1974 |
| G.C.S. Johnson Limited | Transport & logistics | 2002 |
| G.O.T.Y Platinum Investments Ltd | Wholesale & retail | 2019 |
| G.R.S Property Development Ltd | Real estate | 2025 |
| G3 Studios Ltd | Information & communication | 2026 |
| G4 Housing Ltd | Real estate | 2023 |
| G5 Distribution Ltd | Wholesale & retail | 2023 |
| Gabriele & Amelia Ltd | Extraterritorial | 2012 |
| GAC Netherlands Limited | Transport & logistics | 1995 |
| Gadgets Garage Ltd | Wholesale & retail | 2025 |
| Gaia Homes and Gardens Ltd | Households | 2023 |
| Gainford Developments Ltd | Construction | 2024 |
| Galaxy Blinds & Interiors Ltd | Construction | 2026 |
| Gallabar Farm Limited | Agriculture & fishing | 1973 |
| Gallagher Insights Ltd | Professional & scientific | 2024 |
| Gamble DE Grussa Ltd | Extraterritorial | 2004 |
| Game Time Sports CIC | Education | 2022 |
| Gangwayclothing Ltd | Wholesale & retail | 2023 |
| Garbutt Properties Limited | Real estate | 2026 |