| Felix Racing Bloodstock Ltd | Ashford | 2026 |
| Felix Racing Syndicate Ltd | Bromley | 2024 |
| Felix Treadwell Ltd | Hailsham | 2021 |
| Felix Vitae Limited | London | 2023 |
| Felixco Limited | London | 2011 |
| Felixstowe and Suffolk Bowling Club Limited | Ipswich | 1948 |
| Felixstowe Book Festival | Felixstowe | 2016 |
| Felixstowe Ferry Golf Club Limited | Felixstowe | 2011 |
| Felixstowe Ferry Sailing Club Limited | Ipswich | 2016 |
| Felixstowe Fitness Ltd | Bury St Edmunds | 2022 |
| Felixstowe Guitar Conservatoire Ltd | Felixstowe | 2025 |
| Felixstowe Land Train Limited | Brigg | 2018 |
| Felixstowe Martial Arts Ltd | Bury St Edmunds | 2023 |
| Felixstowe Padel Limited | Ipswich | 2026 |
| Felixstowe Rowing Club Ltd | Ipswich | 2020 |
| Felixstowe Rugby Union Football Club Limited | Felixstowe | 2011 |
| Fell Fitness Community Ltd | York | 2025 |
| Fell Rebel Fitness Limited | Alston | 2023 |
| Fell Side Auto Club Limited | Cramlington | 1997 |
| Fell Wellness Ltd | Kendal | 2020 |
| Felling ABC CIC | Gateshead | 2025 |
| Felling Cricket Club C.I.C. | Gateshead | 2014 |
| Fellingham Group Limited | Grantham | 2024 |
| Fellow Travellers Limited | Cranleigh | 2021 |
| Fellowhood Touring Limited | London | 2011 |
| Fellows Horses Limited | Newtown | 2019 |
| Fellowship & Fitness Ltd | London | 2025 |
| Fellowship Art Ltd | London | 2025 |
| Fellowship Racing Ltd | London | 2025 |
| Fellside Events Ltd | Carlisle | 2020 |
| Fellside Recordings Limited | Cockermouth | 2000 |
| Feloriker Fit Ltd | Ivybridge | 2025 |
| Felt Licensing Limited | London | 2005 |
| Felt Media Ltd. | London | 2001 |
| Felt Music Canada Limited | London | 2024 |
| Felt Music Limited | London | 2008 |
| Felt Publishing Limited | London | 2009 |
| Felt Theatre Limited | Bury St. Edmunds | 2025 |
| Feltham Town Football Club Ltd | Feltham | 2023 |
| Felthorpe Flying Group Limited | Norwich | 2023 |
| Felthorpe Tiger Group Ltd | Norwich | 2002 |
| Feltmakers (IFA) Limited | London | 2013 |
| Female Alpha Fitness Ltd | Glasgow | 2023 |
| Female Ballerz FC Ltd | Caterham | 2024 |
| Female Documentary Photography Foundation Ltd | London | 2023 |
| Female Energy Records Limited | Sheffield | 2014 |
| Female Fitness Cheshire Ltd. | Whitchurch | 2017 |
| Female Fitness Studio Limited | Chester | 2019 |
| Female Futsal Alliance CIC | Glenrothes | 2025 |
| Female Personal Trainer Ltd | London | 2018 |
| Female Sports Group Limited | Liverpool | 2013 |
| Femalebodyworkouts Limited | Preston | 2022 |
| Females Create Limited | London | 2019 |
| Femi Bello Limited | London | 2024 |
| Femi Koleoso Ltd | Fitzrovia | 2025 |
| Femi Precious and Friends Chorale Ltd | Wolverhampton | 2026 |
| Femi Sami Studios Ltd | Kington | 2024 |
| Femina Britannia Ltd | Shrewsbury | 2025 |
| Feminist Exchange Network CIC | Glasgow | 2020 |
| Femme Fatale Entertainment Ltd. | Liverpool | 2018 |
| Femme Open UK Ltd | Cheltenham | 2025 |
| Femmeactiv Limited | Bushey | 2025 |
| Femmedm Ltd | Ayr | 2025 |
| Femmesnoiresferoces Limited | London | 2021 |
| Femsportex Limited | Manchester | 2025 |
| Femzfitness Ltd | London | 2024 |
| FEN View Lakes Ltd | Ely | 2024 |
| Fen.Elektra Ltd | London | 2025 |
| Fence Club 43 Ltd | London | 2021 |
| Fencers Camps Limited | London | 2024 |
| Fencing FUN Limited | Edinburgh | 2013 |
| Fender FC C.I.C. | Prenton | 2024 |
| Fenella Fielding Foundation Ltd | London | 2020 |
| Fenella J. Miller Ltd | Clacton-On-Sea | 2023 |
| Fenellaverse Studios Ltd | Hartlepool | 2026 |
| Feng Everyday Ltd | London | 2025 |
| Feng Ling Productions Limited | London | 2021 |
| Feniceactive Ltd | London | 2024 |
| Fenix Active Ltd | Grimsby | 2013 |
| Fenix International Limited | London | 2016 |
| Fenix Tiger Ltd | London | 2024 |
| Fenixlondon Ltd | London | 2025 |
| Fenland Aero Club (Licensing) Limited | Spalding | 2001 |
| Fenland Aquapark Ltd | Peterborough | 2021 |
| Fenland Fitness Limited | Lincoln | 2026 |
| Fenland Flying School Limited | Spalding | 2014 |
| Fenland Swim Academy Ltd | March | 2025 |
| Fenn Integrated Services Limited | Chislehurst | 2021 |
| Fennelly Art Limited | Merseyside | 2004 |
| Fennes Shoot School Ltd | Barnet | 2014 |
| Fennessy & Jones Limited | Huntingdon, | 1974 |
| Fennswood Ltd | Brigg | 2020 |
| Fenny Castle Project Company CIC | Wells | 2020 |
| Fenny Racing Ltd | Stafford | 2018 |
| Fenregis Trophies Limited | Wisbech | 2005 |
| Fenrir Outdoor Experiences Limited | Salisbury | 2025 |
| Fenrock Limited | Wisbech | 2016 |
| Fens Falconry Ltd | Wisbech St Mary | 2024 |
| Fenslo Ltd | London | 2024 |
| Fensoms Gym Limited | St. Albans | 2021 |