| Fishtek Marine Limited | Totnes | 2016 |
| Fishvax Solutions Ltd | Falkirk | 2023 |
| Fishveg Ltd | Slough | 2022 |
| Fishwell Leisure Limited | Liverpool | 2013 |
| Fishy Businez Ltd | Isle Of Mull | 2024 |
| Fishy Catch Limited | Porthmadog | 2014 |
| Fishyfingers JB Limited | Sawbridgeworth | 2026 |
| Fiskebas Acquisition Limited | Lerwick | 2025 |
| Fiskebas Fishing Company Limited | Lerwick | 1996 |
| Fiskeknallen Holdings Ltd | London | 2025 |
| Fit & Wild Ltd | Doncaster | 2025 |
| Fit and Fertile Limited | Carnforth | 2003 |
| Fit Itree Ltd | Doncaster | 2025 |
| Fitling Farm Limited | Hedon | 2025 |
| Fittocks Stud Limited | Newmarket | 1980 |
| Fitton Farms Ltd | Northwich | 2019 |
| Fitzgibbons Birkenhead Limited | Reading | 2017 |
| Fitzwilliam Land Company (the) | Peterborough | 1968 |
| Five Acre Farm CIC | Bristol | 2023 |
| Five Acre Farm Crowton Ltd | Liverpool | 2025 |
| Five Acre KOI Supplies Ltd | Chesterfield | 2005 |
| Five ASH Down Paddock Ltd | Uckfield | 2021 |
| Five Bees Farm Limited | Reading | 2008 |
| Five FOX Limited | Brandon | 2023 |
| Five J Trading Ltd | Musselburgh | 2026 |
| Five Lakes Fishery Ltd | Harlow | 2018 |
| Five Oaks Farm Limited | Billingshurst | 1960 |
| Five Oaks Holdings Yorkshire Ltd | Woodlesford Leeds | 2026 |
| Five Ponds Farm Ltd | London | 2017 |
| Five Ways Farm Limited | Norwich | 2005 |
| Fivehills Limited | London | 1995 |
| Fivepenny Fencing Ltd | Ness | 2012 |
| Fives Farm Ltd | Bournemouth | 2020 |
| Fiveways Farming Limited | Colchester | 2018 |
| Fizzical Ltd | London | 2019 |
| FJA Fishing Company Ltd | Shetland | 2019 |
| Fjord Forestry Ltd | Wimborne | 2020 |
| Fjord Horse Studbook Society Limited | Inverurie | 1999 |
| Fjords Community CIC | Bilston | 2025 |
| Fjords Finds Ltd | Bilston | 2024 |
| FJT ( Feedstock Services ) Ltd | Brigstock | 2024 |
| FKB Limited | Nottinghamshire | 2007 |
| Flac Farms Limited | Londonderry | 2025 |
| Fladda Maid Fishing Company Limited | Buckie | 2015 |
| Flagleaf Farming Limited | Lincoln | 1963 |
| Flagstaff Farm Ltd. | Banwell | 1997 |
| Flamborough Farms Limited | Bristol | 2011 |
| Flame Firewood Ltd | Reading | 2023 |
| Flanders Fallen Stock Limited | Stoke-On-Trent | 2018 |
| Flanigan Technical Services Ltd | Airdrie | 2023 |
| Flansham Farm Ltd | Chichester | 2023 |
| Flarebuck Ltd | London | 2017 |
| Flash House Farms Limited | Ripon | 2014 |
| Flashetts & Quidhampton Mill Conservation Area Ltd | Basingstoke | 2020 |
| Flatfield Woodlands Limited | Horsham | 2024 |
| Flathurst Stables Ltd | Petworth | 2014 |
| Flatt Marine Ltd | Penryn | 2019 |
| Flavourfresh Salads Limited | Southport | 1997 |
| Flawford Farm Limited | Melton Mowbray | 1978 |
| Flax Cultivation Limited | Ipswich | 2021 |
| Flax Project C.I.C. | Plymouth | 2023 |
| Flaxdale Forests Ltd | Bakewell | 2023 |
| Flaxlands Kennels Limited | Stonehouse | 2007 |
| Flaxwell Farming Ltd | Market Rasen | 2025 |
| Flect Nexus Ltd | London | 2026 |
| Fleece and Feathers Ltd | Llansantffraid | 2025 |
| Fleecewood Manor Ltd | Pencader | 2024 |
| Fleetbank Farms Limited | York | 1963 |
| Fleets Farms Limited | Ripon | 2011 |
| Fleetwood Barns Ltd | New Moat | 2024 |
| Fleetwood Hall Farm & Stud Ltd | Samlesbury | 2021 |
| Fleming Farms Limited | Roxburghshire | 2012 |
| Flemington Farms Limited | Tayside | 2002 |
| Fletcher Farming and Dairy Services Limited | Clifton Moor | 2017 |
| Fletcher Sport Horses Ltd | Faringdon | 2025 |
| Fletcher Tree Services Ltd | Lancing | 2022 |
| Fletchers (Trees) Limited | Ware | 2001 |
| Fletchers Industries Limited | Lincoln | 2021 |
| Fletching Farms Limited | Uckfield | 1959 |
| Flexiborder Ltd | Accrington | 2024 |
| Flexigraze CIC | Newcastle Upon Tyne | 2011 |
| Flexsys Open Systems Limited | Chippenham | 1996 |
| FLF Trading Company Limited | Dronfield | 2010 |
| Flights for Their Future CIC | Leamington Spa | 2023 |
| Flightshott Farm Limited | Tonbridge | 1951 |
| Flint OWL Farms Ltd | Glynde | 2021 |
| Flintham & Scoley Limited | Lincoln | 1966 |
| Flintham Consulting Limited | Borrowash | 1995 |
| Flintham Farms Limited | Newark | 2025 |
| Flintshare Community Supported Agriculture Ltd | Mold | 2010 |
| Flintshire Woodlands Limited | Wrexham | 1985 |
| Flintstone Bloodstock Ltd | Chippenham | 2018 |
| Flippin' Dog Limited | Bristol | 2012 |
| Flistridge Fold Limited | Malmesbury | 2010 |
| Flit Engineering & Storage Limited | Bedford | 1965 |
| Flixton Farms Limited | Bungay | 2012 |
| Flixton Mushrooms Ltd. | Norwich | 1998 |
| Float Fish Farm & Fishery Ltd | Farcet | 2023 |
| Float Fish Farm Limited | Peterborough | 2021 |
| Floating Buffalo Ventures Ltd | Poole | 2025 |