| Fetcham Kids Club UK Limited | Leatherhead | 2019 |
| Fetcham Village Pre-School | Leatherhead | 2006 |
| Fetn Ltd | Hinckley | 2025 |
| Fets Learning Ltd | Ilford | 2016 |
| Fettes Centre for Language & Culture Limited | Edinburgh | 2006 |
| Fettes College | Edinburgh | 2022 |
| Fettes International Limited | Edinburgh | 2018 |
| Fettle Fitness Education Ltd | Hillsborough | 2024 |
| Fever Academy Ltd | Aylesbury | 2025 |
| Fever Dance Club Ltd | Preston | 2019 |
| FEW Small Steps Ltd | London | 2015 |
| Fewtures Limited | Kettering | 2026 |
| Feydrift Ltd | Cardiff | 2025 |
| Feynman Tuition Centre Limited | Ruislip | 2022 |
| FF Academy Ltd | Aberdeen | 2026 |
| FF Office Ltd | London | 2024 |
| Ffac C.I.C. | Exeter | 2024 |
| Ffalala Limited | Cardiff | 2014 |
| Ffasiwn Stiwdio Community Interest Company | Caerleon | 2021 |
| Ffcc Limited | Exeter | 2020 |
| Ffcs Trading Ltd | Dromore | 2021 |
| Ffdcuk Ltd | Manchester | 2023 |
| Fffx Limited | London | 2024 |
| FFG Syndicate Limited | Cobham | 2023 |
| FFH Educational Trust | Salford | 2009 |
| Ffidil Fawr CBC | Port Talbot | 2026 |
| Fforwm Services Limited | Cardiff | 1995 |
| Ffrith Famau CIC | Mold | 2022 |
| FG Fitness Education Ltd | Dereham | 2022 |
| FG Languages Ltd | Bournemouth | 2021 |
| FG Tennis Ltd | London | 2023 |
| FGH Training Limited | Lancaster | 1992 |
| FGI Education Ltd | London | 2024 |
| FGM Driving School Ltd | Southport | 2026 |
| FGN Foundation CIC | London | 2026 |
| FGS Media Limited | Surrey | 2002 |
| FGT Consultants Ltd | Cardiff | 2020 |
| FGV CIC | London | 2025 |
| FH Coaching Ltd | Herne Bay | 2023 |
| FH Outreach CIC | London | 2024 |
| Fhbuilder Ltd | Stockton-On-Tees | 2023 |
| FHE Services Limited | Leigh-On-Sea | 2016 |
| Fhog Ltd | Blandford Forum | 2010 |
| FHS Trust Limited | Swansea | 1972 |
| FI CI (UK) Limited | London | 2026 |
| FI Pandhal Ltd | Feltham | 2019 |
| FI Tutors Maths Ltd | Loughton | 2024 |
| FI WI Road CIC | London | 2023 |
| Fiani Trading Ltd | London | 2021 |
| Fibonacci Training Ltd | Birmingham | 2024 |
| Fibre of the Gods Limited | Glastonbury | 2016 |
| Fibreplus Telecommunications College Limited | Melksham | 2013 |
| Fibro-Connect-Ts CIC | Hartlepool | 2021 |
| Fibromyalgia Education and Advocacy UK Ltd | London | 2023 |
| FIC Training Ltd | Grangemouth | 2018 |
| Ficare 360 Ltd | Whitley Bay | 2025 |
| Fiddes Plant & Crane Training Limited | Inverness | 2022 |
| Fide-Ukca Limited | London | 2018 |
| Fidel ACA Ltd | London | 2023 |
| Fidelis Tutores Ltd | Wolverhampton | 2024 |
| Fidgets Ltd | Tunbridge Wells | 2005 |
| Fidgety Feet Limited | Matching Green | 2018 |
| Fidjit Ltd | Glossop | 2021 |
| Fido Languages Ltd | Medomsley | 2024 |
| Fidos Agility Ltd | Bracknell | 2021 |
| Fidos Training Centre Ltd | Bracknell | 2021 |
| Field and Forest Outdoor Learning Ltd | Winchester | 2025 |
| Field Court Junior School | Gloucester | 2011 |
| Field Families CIC | Bideford | 2024 |
| Field GUN Sport Ltd | Southsea | 2020 |
| Field House Day Care Nursery Limited | Stoke-On-Trent | 2005 |
| Field Lane Playgroup Limited | Derby | 2004 |
| Field Notes / Nodiadau Maes CIC | Monmouth | 2025 |
| Field Notes CIC | Helston | 2015 |
| Field Shelter CIC | Haltwhistle | 2024 |
| Field Studies Council | Shrewsbury | 1946 |
| Field Studies Ireland CIC | Newcastle | 2021 |
| Field SW CIC | Exeter | 2023 |
| Field to Feast CIC | Whitchurch | 2026 |
| Field View Equestrian C.I.C. | York | 2023 |
| Fieldhead Associates Ltd | Leeds | 2023 |
| Fielding Financial Family Limited | London | 2009 |
| Fieldpoint Ltd | Ramsgate | 2025 |
| Fields & Co Property Services Ltd | Billingham | 2026 |
| Fields Multi Academy Trust | Whitchurch | 2016 |
| Fields of Unity Ltd | Bradford | 2025 |
| Fieldwalk Western Ltd | Crieff | 2024 |
| Fieldwork Education Limited | London | 1997 |
| Fieldwork Tuition Services Ltd | Sheet | 2024 |
| Fierce Theatre Schools Limited | Edinburgh | 2011 |
| Fierté Multi-Academy Trust | Burton On Trent | 2011 |
| Fiery Feet Limited | Leamington Spa | 2007 |
| Fiery Jacks C.I.C. | Cardiff | 2021 |
| Fiesta Sports Coaching Ltd | Market Harborough | 2018 |
| FIF Ltd | Wakefield | 2019 |
| Fife Adrenaline Sports Team Ltd | Glenrothes | 2016 |
| Fifi's Learning Station Ltd | London | 2025 |
| Fifield Training Limited | Norwich | 2012 |
| Fifty Bees CIC | Somerton | 2024 |
| Fifty Years Hence Ltd | London | 2024 |