| Full Moon Fitness Ltd | Bootle | 2022 |
| Full Moon Training Limited | Bootle | 2024 |
| Full Motion Fitness Ltd | Hampshire | 2021 |
| Full of Life Productions Elevated Limited | London | 2023 |
| Full on Adventure Ltd | Carrbridge | 2008 |
| Full OUT Dance Fitness Ltd | Merthyr Tydfil | 2025 |
| Full Pitch Analytics Ltd | Wokingham | 2024 |
| Full Potential Performance Ltd | Wallingford | 2009 |
| Full Power Fitness Limited | Heanor | 2018 |
| Full Power Studios Ltd | Leeds | 2023 |
| Full Range Fitness Limited | Polegate | 2015 |
| Full Send CF Ltd | Christchurch | 2026 |
| Full Send Fitness Ltd | Newton-Le-Willows | 2024 |
| Full Send Motorsport Limited | Fareham | 2025 |
| Full Send Racing Ltd | London | 2025 |
| Full Send South Wales Ltd | Llanelli | 2025 |
| Full Spectrum Productions | 162-168 Regent St | 2003 |
| Full Stack Records Limited | London | 2017 |
| Full Steam Ahead Theatre Ltd | Stockton-On-Tees | 2025 |
| Full Stretch Goalkeeping Ltd | Stoke-On-Trent | 2022 |
| Full Surface Ltd | Perth | 2018 |
| Full Swing Events Ltd | London Colney | 2024 |
| Full Swing Fitness Limited | Cuffley | 2026 |
| Full Swing Golf Limited | Stourbridge | 2025 |
| Full Swing Polo Limited | Petworth | 2006 |
| Full Throttle Films Ltd | Reading | 2024 |
| Full Throttle Raceway Limited | West Midlands | 2005 |
| Full Time Talent Ltd | Weymouth | 2025 |
| Full Works Property Group Ltd | Petworth | 2013 |
| Full-Filament Ltd | Bolton | 2023 |
| Full-Fitness Limited | Warlingham | 2012 |
| Full-Time Ltd | Cardiff | 2025 |
| FULL40 Training Program Limited | Liverpool | 2024 |
| Fullam Ketch Fitness Ltd | Sheffield | 2026 |
| Fullbrook Sports Centre Limited | Addlestone | 2011 |
| Fullcircle Design & Art Direction Ltd | Borehamwood | 2012 |
| Fuller 206 Ltd | Bangor | 2013 |
| Fuller Fitness Ltd | Market Drayton | 2024 |
| Fuller Life Gym CIC | Deal | 2025 |
| Fuller Life PT Ltd | Dover | 2024 |
| Fuller Productions Limited | Bristol | 2014 |
| Fullerbustbestie Limited | Wickham | 2024 |
| Fullerians Rugby Football Club Limited | Watford | 2010 |
| Fullerton MRC Ltd | Mildenhall | 2010 |
| Fullfill LLC UK Limited | London | 2004 |
| Fullmoon Art Ltd | London | 2021 |
| Fullninety Sports Management Limited | Formby | 2016 |
| Fullsteam Limited | Egham | 2015 |
| Fullstopnewparagraph Ltd | Epsom | 2016 |
| Fullstorm Collegiate Limited | New Romney | 2026 |
| Fullteam Limited | Lincoln | 2015 |
| Fulltone Productions Ltd | Devizes | 2022 |
| Fulltone Symphony Orchestra Limited | Devizes | 2025 |
| Fully Charged Entertainment Ltd | Sale | 2023 |
| Fully Clothed Beauty Ltd | London | 2019 |
| Fully Focused Community Trust | London | 2010 |
| Fully Functional Fitness Ltd | Pontyclun | 2021 |
| Fully Funktional Limited | Barnet | 2005 |
| Fully Fused Fireworks Limited | Shefford | 2004 |
| Fully Gassed Giveaways Ltd | St Austell | 2026 |
| Fully Illustrated Limited | Manchester | 2008 |
| Fully Peppered Festival Ltd | Stockport | 2026 |
| Fully Pumped Gym Ltd | Norwich | 2013 |
| Fully Visualised Limited | London | 2022 |
| Fulneck Golf Club Limited(The) | Pudsey | 1922 |
| Fulture CIC | Southampton | 2025 |
| Fulwell Community Library Community Interest Company | Sunderland | 2017 |
| Fulwell Golf Club Ltd | Hampton Hill | 2020 |
| Fulwood & Broughton Cricket Club Limited | Preston | 2026 |
| Fulwood Sports Club Limited | Sheffield | 1910 |
| Fumboo Limited | Sevenoaks | 2013 |
| FUN & Fitness With Sheila CIC | Trimdon Station | 2025 |
| FUN 4 ALL Rides Limited | Milton Keynes | 2002 |
| FUN 4 Families UK C.I.C. | Bristol | 2019 |
| FUN 4 Kidz | Netherton | 2001 |
| FUN Active Creative Events Ltd | Reading | 2005 |
| FUN and Fitness Ltd | Kidderminster | 2015 |
| FUN and Games Limited | High Wycombe | 2022 |
| FUN Beats Cool Ltd | Margate | 2019 |
| FUN City (UK) Ltd | Bristol | 1996 |
| FUN City Laser TAG Ltd | Dudley | 2025 |
| FUN City Simulators Ltd | Dudley | 2025 |
| FUN Club Blue England Ltd | Staines-Upon-Thames | 2020 |
| FUN DAD Dean Ltd | London | 2022 |
| FUN Drum Ltd | Gillingham | 2023 |
| FUN Experiences Ltd | Manchester | 2021 |
| FUN Factor Leeds Limited | Leeds | 2015 |
| FUN Farm (Lincoln) Limited | Spalding | 2007 |
| FUN Farm Investments Limited | Spalding | 2022 |
| FUN Farm Limited | Spalding | 1997 |
| FUN Fit Factory Ltd | Brighton | 2013 |
| FUN Fit Gymnastics Limited | South Nutfield | 2018 |
| FUN Fitness Limited | Smalley | 2015 |
| FUN Fitness With Limited | Henfield | 2021 |
| FUN for Dogs Highland Ltd | Invergordon | 2022 |
| FUN Fusion Limited | Hailsham | 2024 |
| FUN GUY Productions Ltd | Woking | 2023 |
| FUN House (London) Limited | London | 2026 |
| FUN House Productions Limited | Halifax | 2001 |
| FUN HQ Cardiff Ltd | Cardiff | 2022 |