| Fitroots Community | Slough | 2019 |
| Fitroots Limited | Slough | 2016 |
| Fitscript Ltd | London | 2025 |
| Fitskl Ltd | London | 2025 |
| Fitsmart Fitness Limited | Paisley | 2015 |
| Fitsolution Training Ltd | Brentwood | 2018 |
| Fitsteps Limited | London | 2012 |
| Fitt NE Ltd | Newcastle Upon Tyne | 2025 |
| Fittabodies Gymnasium Limited | Bury Saint Edmunds | 2003 |
| Fitter 4 Life Limited | London | 2015 |
| Fitter Body Ladies (Wales) Limited | Penarth | 2020 |
| Fitter Body Ladies Basildon Ltd | Basildon | 2018 |
| Fitter Body Ladies Birchgrove Ltd | Penarth | 2026 |
| Fitter Body Ladies Cardiff Central Ltd | Penarth | 2023 |
| Fitter Body Ladies Cardiff Limited | Cardiff | 2022 |
| Fitter Body Ladies Hendy Ltd | Swansea | 2024 |
| Fitter Body Ladies Holcot Ltd | Northampton | 2026 |
| Fitter Body Ladies Kettering Limited | Wellingborough | 2020 |
| Fitter Body Ladies Llanelli Limited | Llanelli | 2019 |
| Fitter Body Ladies Newport Pagnell Limited | Wellingborough | 2022 |
| Fitter Body Ladies Norwich Ltd | Norwich | 2023 |
| Fitter Body Ladies Pontardawe Ltd | Swansea | 2023 |
| Fitter Body Ladies Sketty Ltd | Penarth | 2020 |
| Fitter Body Ladies Wellingborough Limited | Wellingborough | 2018 |
| Fitter Family Ltd | Staines-Upon-Thames | 2020 |
| Fitter Stronger Faster Gym Limited | Maidstone | 2017 |
| Fitter Than Fit Limited | Bournemouth | 2013 |
| Fitter, Stronger Limited | Maidstone | 2015 |
| Fitter-Bodies Ltd | Bradford | 2016 |
| Fittever Ltd | Wallingford | 2017 |
| Fittfind Limited | London | 2016 |
| Fittie Committee Limited | Birmingham | 2025 |
| Fittolift Ltd | Kingswinford | 2020 |
| Fitton Mini Golf Limited | Lynch Wood | 2015 |
| Fittpro Studios Ltd | Newtownabbey | 2015 |
| Fittwithfran Limited | Bristol | 2026 |
| Fitu Fitness Limited | Sheffield | 2022 |
| Fitual Limited | Skipton | 2026 |
| Fitunion Health & Fitness Limited | Birchington | 2024 |
| Fitvaro Ltd | London | 2026 |
| Fitvisual Ltd | Exeter | 2018 |
| Fitways Adventures Limited | Maidenhead | 2013 |
| Fitwins Limited | Cardiff | 2019 |
| Fitworks Franchising Ltd | Penn Street | 2023 |
| Fitworks Training Ltd | Penn Street | 2023 |
| Fitxfly Limited | Beckenham | 2024 |
| Fityard Limited | Portaferry | 2026 |
| Fitz Fine Art Restoration Limited | Hitchin | 2026 |
| Fitz Gym Ltd | Haywards Heath | 2021 |
| Fitz of Laughter Comedy Club Ltd | Dudley | 2022 |
| Fitz Productions Limited | London | 2012 |
| Fitzadlem DE Burgo Limited | Yarm | 2011 |
| Fitzdares Limited | London | 2005 |
| Fitzgerald Arts Management Limited | Solihull | 2011 |
| Fitzgraham Academy of Dance Limited | Chippenham | 2022 |
| Fitzrovia Noir Community Interest Company | London | 2011 |
| Fitzrovia Youth in Action Activities Limited | London | 2015 |
| Fitzroy Lodge ABC | London | 2017 |
| Fitzwilliam Place Ltd | Benfleet | 2020 |
| Fitzy Productions Limited | Liverpool | 2009 |
| Five 3 Five Limited | Penn | 2015 |
| Five Alive Events Ltd | Potters Bar | 2024 |
| Five and Nine Productions Limited | London | 1980 |
| Five Aside Theatre CIC | Mitcham | 2020 |
| Five Cat Films Ltd | Hitchin | 2024 |
| Five Counties Brickwork Limited | Tamworth | 1996 |
| Five Five One Limited | Halesowen | 2014 |
| Five Fold Projects CIC | Henfield | 2026 |
| Five Foot 2 Blonde Limited | London | 2008 |
| Five Four Sports Management Ltd | London | 2024 |
| Five Golden Tickets Ltd | London | 2025 |
| Five Gymnastics Fulham Ltd | London | 2019 |
| Five Hearts Events Limited | Haywards Heath | 2025 |
| Five Hundred Motor Racing Club of Ireland Limited | Kircubbin | 1956 |
| Five Kingdoms Sailing Club Ltd | Shipley | 2025 |
| Five Melons Limited | Bath | 2022 |
| Five Mile Films Limited | Bristol | 2018 |
| Five Nations Roller Derby CIC | Nottingham | 2021 |
| Five on Five Limited | Paisley | 2005 |
| Five Orange Balls Ltd | London | 2025 |
| Five River Ashford Limited | Wallington | 2019 |
| Five River Dover Limited | Wallington | 2019 |
| Five River Entertainment Limited | Southall | 2018 |
| Five River Group Limited | Wallington | 2017 |
| Five River Warminster Ltd | Wallington | 2021 |
| Five Rivers Indoor Bowls Club (Salisbury) Limited | Salisbury | 2011 |
| Five Seasons Gardening Limited | Orpington | 2016 |
| Five Sisters Limited | Ramsgate | 2012 |
| Five Sisters ZOO Limited | West Calder | 2010 |
| Five SIX Productions Ltd | Windsor | 2025 |
| Five Star AV Limited | Camberley | 2017 |
| Five Star Events and Shows Ltd | Wigan | 2025 |
| Five Star Films Limited | London | 1959 |
| Five Star Fitness MC Ltd | Milton Keynes | 2015 |
| Five Star International Events Limited | Bellshill | 2020 |
| Five Star Media Limited | Manchester | 2025 |
| Five Star Promotions (UK) Ltd | Crawley | 2013 |
| Five Star Racing Club Ltd | Glasgow | 2026 |
| Five Star Rally Limited | London | 2015 |
| Five Star Rugby Ltd | Dundee | 2017 |