| Festival Park SKI and Snowboard Club CIC | Stoke On Trent | 2011 |
| Festival Players (Loughborough) Limited(The) | Leicestershire | 1977 |
| Festival Players Theatre Company | Worcester | 1998 |
| Festival Racing on Course Ltd | Bristol | 1998 |
| Festival Republic Group Limited | Stafford | 2026 |
| Festival Republic Limited | London | 1994 |
| Festival Theatre (Hyde) Limited | Cheshire | 1952 |
| Festival TOO | King'S Lynn | 1990 |
| Festival TOO Trust Limited | King'S Lynn | 2013 |
| Festival Trading Limited | Lisburn | 2015 |
| Festival Wedding DJS Ltd | Welling | 2024 |
| Festivals and Events International Ltd | London | 2007 |
| Festivals and Gigs Ltd | Bristol | 2024 |
| Festivals Edinburgh Limited | Edinburgh | 2007 |
| Festivals North East Limited | Durham | 2025 |
| Festivals UK Limited | Beccles | 2007 |
| Festive Colours Ltd | Swindon | 2019 |
| Festive Floats Limited | Barking | 2021 |
| Festive Installers Limited | Dorchester | 2012 |
| Festivities Ltd | Sheffield | 2021 |
| FESTIVITY4U Ltd | Stanmore | 2025 |
| Festivology Ltd | Plymouth | 2020 |
| Festivus Ltd | Milton Keynes | 2014 |
| Festiwoo Ltd | London | 2021 |
| Festoon Studios Ltd | Waltham Cross | 2016 |
| Fete Domnik UK Limited | London | 2013 |
| Fettes Enterprises Limited | Edinburgh | 1998 |
| Feudal Barons Ltd | Essex | 2026 |
| Feuzion Group Ltd | London | 2025 |
| Fever Dance Company Limited | Preston | 2006 |
| Fever Pitch Academy Ltd | Bellshill | 2022 |
| Fevered Sleep | London | 1998 |
| Feverking Limited | Arundel | 2005 |
| Fevo Consultancy Limited | Andover | 2020 |
| Fevo Limited | Andover | 2020 |
| Fewer Feathers Limited | London | 2025 |
| Feyu Studio Ltd | Manchester | 2023 |
| FEZ Tattoo Limited | Southampton | 2022 |
| Feztree Limited | Gloucester | 1980 |
| Fezziwig Productions Limited | Sudbury | 2025 |
| FF Hospitality Services Ltd | London | 2026 |
| FF Leisure Limited | Ringwood | 2019 |
| FF Music Ltd | London | 2020 |
| FF Sale Ltd | Manchester | 2025 |
| FF Sports Limited | London | 2020 |
| Ffaf Entertainment Limited | Abingdon | 2020 |
| Ffaf Ltd | Melton Mowbray | 2013 |
| FFB Growth UK Limited | Newcastle Upon Tyne | 2020 |
| FFC Sports Ltd | Chelmsford | 2020 |
| Ffdtv Limited | London | 2025 |
| FFF Adrian Freire-Benites Limited | London | 2025 |
| FFF Aiden Curuk Limited | Cambridge | 2025 |
| FFF Alex Mellor Limited | Bournemouth | 2026 |
| FFF Andy Carr Limited | Newcastle Upon Tyne | 2025 |
| FFF Antonio Soares Limited | Barnet | 2025 |
| FFF BEN Espley Limited | Leamington Spa | 2025 |
| FFF BEN Hall Ltd | Sudbury | 2026 |
| FFF Calvin James Limited | Wolverhampton | 2025 |
| FFF Carl Owen Limited | Harlow | 2025 |
| FFF Cavell King Limited | London | 2026 |
| FFF Chris Merriman Limited | Manchester | 2026 |
| FFF Coaching Ltd | Bournemouth | 2025 |
| FFF Dave North Limited | Southampton | 2025 |
| FFF Gareth Sparks Limited | Exmouth | 2024 |
| FFF Giovani Siwak Limited | Nottingham | 2024 |
| FFF Graham Parker Ltd | Alfreton | 2024 |
| FFF Harry Shepherd Limited | Harpenden | 2025 |
| FFF Jack Middleton Limited | Aldershot | 2025 |
| FFF Jack Withers Limited | Spalding | 2025 |
| FFF Jake Bristowe Limited | Exeter | 2025 |
| FFF Jamie Power Limited | Camberley | 2025 |
| FFF Jamie Woodall Limited | Peterborough | 2025 |
| FFF JAY and Jess Limited | Coventry | 2024 |
| FFF LEO Peters Limited | Hassocks | 2025 |
| FFF Luca Luppi Limited | Milton Keynes | 2025 |
| FFF Matt Bailey Limited | Belper | 2025 |
| FFF Michael Nield Limited | Minehead | 2025 |
| FFF Mike Sudworth Limited | Newcastle Upon Tyne | 2024 |
| FFF Moise & Wayne Limited | Borehamwood | 2025 |
| FFF Nurul Hoque Limited | Oldham | 2025 |
| FFF Recordings Limited | Amersham | 2014 |
| FFF Richard Slevin Limited | Leicester | 2025 |
| FFF Ross Quayle Limited | Wallasey | 2025 |
| FFF Ruari & Darci Limited | Falkirk | 2025 |
| FFF Ryan Derbyshire Limited | St. Helens | 2024 |
| FFF Salim Berkkun Limited | Enfield | 2025 |
| FFF Sports Limited | Hitchin | 2020 |
| FFF Steven Mann Limited | Castleford | 2025 |
| FFF Stuart Bell Limited | Carrickfergus | 2025 |
| FFF Thomas Mccolgan Limited | Newtownabbey | 2025 |
| FFF TOM Cave Limited | March | 2025 |
| FFF Will Moxon Limited | Spalding | 2026 |
| Ffff Ltd | Belfast | 2021 |
| Ffhawa Limited | Mildenhall | 2026 |
| Ffin Dance | Ebbw Vale | 2008 |
| Ffin Ltd | Bangor | 2025 |
| Ffion Davies Seminars Limited | Eltham | 2024 |
| Ffiona Lewis Limited | London | 2013 |
| Ffitrwydd MON Fitness Gym Ltd | Llangefni | 2025 |
| Ffitrwydd MON Fitness Studio Ltd | Llangefni | 2025 |