| Flatibo West Limited | London | 1999 |
| Flatpack Flowers Ltd | Waterlooville | 2014 |
| Flatpack Shropshire Ltd | Telford | 2015 |
| Flava Café Bistro Ltd | Stamford | 2023 |
| Flavell Wealth Management Ltd | Leeds | 2012 |
| Flavorfleet Ltd | Edinburgh | 2026 |
| Flavour Boat Limited | Stanmore | 2019 |
| Flavour Fusion Foods Ltd | Hounslow | 2024 |
| Flavour UN Limited | Swansea | 2014 |
| Flavouring Resources Limited | Bath | 1989 |
| Flavours of Life Catering Ltd | Trowbridge | 2018 |
| Flawless Aesthetics UK Ltd | Letchworth Garden City | 2012 |
| Flawless Homes Limited | Brighton | 2020 |
| Flaxcase Limited | Bradford | 1973 |
| Flaxon Limited | Nottingham | 2021 |
| FLD Management, Ltd | London | 2021 |
| Flea Market Ltd | Worcester | 2003 |
| Fleet and Asset Solutions Ltd | Huddersfield | 2025 |
| Fleet Automotive P/S Scotland Limited | Coatbridge | 2020 |
| Fleet Automotive Services Limited | Glasgow | 2021 |
| Fleet Automotive Solutions Limited | Glasgow | 2021 |
| Fleet Business Security (Midlands) Limited | Sutton Coldfield | 2020 |
| Fleet Claims Limited | Bicester | 1995 |
| Fleet Construction Ltd | Gravesend | 2024 |
| Fleet Cottage Limited | Warminster | 2013 |
| Fleet Efficiency Rental Ltd | Maidstone | 2009 |
| Fleet Healthcare Limited | Wallington | 2025 |
| Fleet Image Limited | Co Tyrone | 1995 |
| Fleet Legal Limited | Carlisle | 2017 |
| Fleet Licence Check Limited | Bicester | 2014 |
| Fleet Luxury Packaging Limited | Rochester | 2014 |
| Fleet Return Limited | Stroud | 2015 |
| Fleet Seven Ltd | Norwich | 2017 |
| Fleet Street Ltd | London | 2024 |
| Fleet Taxis Ltd | Bristol | 2014 |
| Fleet Tyre Network Limited | Winchester | 2011 |
| Fleet Way 1967 Limited | Didcot | 2014 |
| Fleet-Arc Limited | Worsley | 1995 |
| Fleetham Investment Management Ltd | Coventry | 2013 |
| Fleethaven Mobility Ltd | Doncaster | 2026 |
| Fleeto Ltd | Dagenham | 2015 |
| Fleetwood ST Property Management Ltd | Preston | 2023 |
| Fleming Medical Practices Limited | Canterbury | 2018 |
| Fleming Securities Limited | Sidmouth | 2000 |
| Flemings Jeans (Liverpool) Limited | Chester | 2006 |
| Flemish Tapestries Limited | Liverpool | 1996 |
| Flemons & Co Limited | Alcester | 2010 |
| Flenburg Limited | Bury | 2020 |
| Flesh Limited | Harrogate | 2025 |
| Fleta Limited | London | 2020 |
| Fletcher Freeman Associates Limited | Waterlooville | 2017 |
| Fletcher Road 1963 Limited | Ipswich | 2014 |
| Fletcher Stewart Ltd | Stockport | 2016 |
| Fletcher, Jennings & Company Limited | Gunnislake | 2008 |
| Fletson Ltd | Coventry | 2014 |
| Fleur DE Sante Limited | Northumberland | 1996 |
| Fleuri NO Invest Ltd | Dover | 2024 |
| Fleuri NO Ltd | Dover | 2024 |
| Fleurons D'Helene Ltd | London | 2010 |
| Flex Accountants Limited | Sheffield | 2011 |
| Flex Connectors Limited | Twyford | 2017 |
| Flex Fibre Limited | York | 2015 |
| Flex Fitness Gym Invest Limited | London | 2023 |
| Flex Fitness Gym Sweden Limited | London | 2023 |
| Flex FM Ltd | Swadlincote | 2015 |
| Flex Office Limited | Sale | 2024 |
| Flex Stays Limited | London | 2023 |
| Flex Travel Ltd | Doncaster | 2025 |
| Flex-Itsolutions Limited | Woodstock | 2021 |
| Flex-R Limited | Sheffield | 2000 |
| Flex-Seal Couplings Limited | Barnsley | 2021 |
| Flexatech Limited | Crewe | 2015 |
| Flexcabinetry Limited | Braintree | 2023 |
| Flexcom IT Limited | Southport | 2018 |
| Flexflow Global Ltd | London | 2022 |
| Flexi Chem Ltd | Sandbach | 2026 |
| Flexi Stove Limited | Ringwood | 2012 |
| Flexi-Pets Limited | Hull | 2024 |
| Flexible Hose Supplies (Northampton) Limited | Oldbury | 1998 |
| Flexible Retirement Limited | Market Harborough | 2008 |
| Flexible Support Options (UK North East) Limited | Newcastle Upon Tyne | 1998 |
| Flexibus Limited | Belfast | 1966 |
| Flexibuy Limited | Cadnam | 2021 |
| Flexifeeds Limited | Sunbury-On-Thames | 2011 |
| Flexiglide Limited | Exeter | 2019 |
| Flexilaw Limited | Beaconsfield | 1996 |
| Fleximix Ltd | Broxburn | 2012 |
| Fleximize Technology Services Limited | Ipswich | 2016 |
| Fleximore Limited | Waltham Abbey | 2007 |
| Flexistop Ltd | Swadlincote | 2012 |
| Flexolite Limited | Malvern | 2021 |
| Flexside Limited | London | 1991 |
| Flexspace Limited | London | 2019 |
| Flextech Limited | Reading | 1992 |
| Flexus Management Ltd | Liverpool | 2016 |
| Flexy Designs Ltd | Ringwood | 2018 |
| Flexy Limited | Ringwood | 2013 |
| Flexy Link Limited | Weston Super Mare | 2019 |
| Flick OFF Limited | London | 1999 |
| Flick Quarry Limited | Chipping Norton | 2017 |