| Flamingo Productions Ltd | Cardiff | 2023 |
| Flamingo Yacht Charters Limited | Renfrew | 2006 |
| Flanagan Sculpture Ltd | Belfast | 2007 |
| Flanerie Ltd | Norwich | 2022 |
| Flannery Fitness Limited | Beckenham | 2025 |
| Flare Arts CIC | Hove | 2022 |
| Flare Football Club Ltd | Southampton | 2023 |
| Flare Lighting Limited | Bishop'S Stortford | 2008 |
| Flare Sports Ltd | Brockworth | 2016 |
| Flare Yoga Ltd | Glasgow | 2025 |
| Flash Back Events Ltd | Birmingham | 2023 |
| Flash Bang Ltd | London | 2016 |
| Flash Climbing Centre Limited | Solihull | 2018 |
| Flash Company Arts Limited CIC | Whitby | 2018 |
| Flash Harold Ltd | Worthing | 2003 |
| Flash Inc Music Entertainment Limited | London | 2016 |
| Flash Media Ltd | Preston | 2013 |
| Flash of Splendour Arts CIC | Witney | 2009 |
| Flash POP Sizzle Ltd | Barnet | 2018 |
| Flash Taekwondo Academy CIC | Edinburgh | 2026 |
| Flash the Cash Ltd | Banbridge | 2026 |
| Flash Theatre Productions CIC | Hereford | 2022 |
| Flashback Entertainment Ltd | London | 2023 |
| Flashpoint Fireworks Limited | Godalming | 2003 |
| Flashtech Motorsport Ltd | Norwich | 2020 |
| Flat 10 Ltd | London | 2021 |
| Flat 12 Productions Limited | London | 2022 |
| Flat Back Stunts Limited | Slough | 2021 |
| Flat CAP Limited | London | 2013 |
| Flat Earth the Musical Ltd | Oxford | 2026 |
| Flat Moon Ltd | Leeds | 2024 |
| Flat OUT Football Ltd | Rochester | 2025 |
| Flat Records Limited | Surrey | 1990 |
| Flat Thirtysix Limited | London | 2013 |
| Flat-Out Tours Ltd | St. Albans | 2026 |
| Flat-Twelve Productions Ltd | London | 2020 |
| FLAT19 Ltd | London | 2024 |
| Flatbush Films Ltd | London | 2010 |
| Flatbush Ltd | North Berwick | 2023 |
| Flatcapdan Miniatures Limited | Bradford | 2023 |
| Flatfoot Limited | | 2002 |
| Flatland Projects CIC | Bexhill-On-Sea | 2020 |
| Flatley Boxing Ltd | Accrington | 2023 |
| Flatman Services Ltd | London | 2004 |
| Flatout Arcades Ltd | Sywell | 2018 |
| Flatout Eurotrackdays Ltd | Hillington | 2024 |
| Flatter Shoes Limited | London | 2025 |
| Flavel Centre Limited | Devon | 1999 |
| Flavoursum Limited | Edinburgh | 2022 |
| Flavrcise Dance Fitness C.I.C. | London | 2020 |
| Flawa Ltd | London | 2019 |
| Flawbored Ltd | London | 2021 |
| Flawed Hero Movement CIC | Stevenage | 2024 |
| Flawed Mandrake Theatre Ltd | Coventry | 2023 |
| Flawless Entertainment Ltd | Barnsley | 2021 |
| Flawless Event Management Consultancy Ltd | Beckenham | 2015 |
| Flawless Football Coaching Ltd | Eastleigh | 2024 |
| Flawless Sailing Ltd | London | 2022 |
| Flax Art Studios Ltd | Belfast | 1993 |
| FLD Leisure Ltd | Bury | 2025 |
| Fleck Illustration Ltd | Glasgow | 2022 |
| Fleck Ltd | Gloucester | 2024 |
| Flecks Floh Ltd | Manchester | 2024 |
| Fleeshman Limited | Droitwich | 2023 |
| Fleet Arts | Belper | 1985 |
| Fleet Fitness Ltd | Kidlington | 2019 |
| Fleet Ford Ltd | Golspie | 2018 |
| Fleet Gymnastics Limited | Wickford | 2018 |
| Fleet Services Limited | St. Peter Port | 1980 |
| Fleet Street Sport & Media Group Limited | Droitwich | 2016 |
| Fleet Town Football Club Limited | Fleet | 2020 |
| Fleeting Rumours Ltd | Ryton | 2024 |
| Fleetlands Flying | Fareham | 2007 |
| Fleetwey Limited | Knightsdale Road Weymouth | 2000 |
| Fleetwood Bowling Club Limited(The) | Lancashire | 1921 |
| Fleetwood Community Comic CON C.I.C. | Thornton-Cleveleys | 2024 |
| Fleetwood Golf Club Limited(The) | Fleetwood | 1932 |
| Fleetwood Gym Juniors FC CIC | Fleetwood | 2024 |
| Fleetwood Nick’D Ltd | Warrington | 2026 |
| Fleetwood Rugby Union Football Club Limited | Fleetwood | 2011 |
| Fleetwood Town Community Trust | Fleetwood | 2011 |
| Fleetwood Wanderers Limited | Thornton-Cleveleys | 1997 |
| Flem Entertainments Ltd | London | 2026 |
| Flemco Holdings Limited | Dundee | 2025 |
| Flemco Trading Limited | Dundee | 2023 |
| Fleming-Honour Limited | London | 1962 |
| Flempton Golf Club Limited | Nr. Bury St Edmunds | 1953 |
| Flesh Eaters Limited | London | 2001 |
| Flesh Ripping Sonic Torment Limited | London | 2013 |
| Fleshment Theatre Ltd | Bristol | 2025 |
| Fletchasketch Limited | Guildford | 2022 |
| Fletcher & Ward Associates Ltd | London | 2026 |
| Fletcher Gallery Services Limited | London | 1999 |
| Fletcher Scenery Limited | Brentwood | 2018 |
| Fletcher Sport Science Limited | Worcestershire | 1997 |
| Fletcher-Raymond Limited | Kingston Upon Thames | 1996 |
| Fletchers Automatics (Rednal) Limited | St Mellons Cardiff | 1960 |
| Fletchers Farm Riding Limited | Colchester | 2023 |
| Flete Park Races Company Limited | Buckfastleigh | 2020 |
| Fleur Darkin Presence Projects Ltd | Edinburgh | 2023 |