| First Team for Ltd | Construction | 2022 |
| Firstcar Holdings Limited | Financial services | 2018 |
| Firstcar Limited | Administrative & support | 2004 |
| Firstclas House Cleaning Ltd | Administrative & support | 2020 |
| Firstmail Marketing Limited | Professional & scientific | 2003 |
| Firstpark Developments Limited | Administrative & support | 2002 |
| Fisch | Education | 2014 |
| Fisher Private Travel Limited | Administrative & support | 2021 |
| Fisons Erba Science (UK) Limited | Professional & scientific | 1900 |
| Fit Driven Ltd | Arts & recreation | 2021 |
| Fitness Incorporated Ltd | Health & social care | 2020 |
| Fitness Runs in the Family Ltd | Arts & recreation | 2016 |
| Fitout Contractors Ltd | Construction | 2025 |
| Fitout Flooring Ltd | Construction | 2016 |
| Fitstuff UK Limited | Wholesale & retail | 2006 |
| Fitting Haven Limited | Real estate | 2025 |
| Fitz ALL Media Limited | Professional & scientific | 2009 |
| Fitzfuture Limited | Professional & scientific | 2015 |
| Fitzregen Limited | Extraterritorial | 2014 |
| Fitzwalter Capital Partners (Financial Trading) Limited | Financial services | 2021 |
| Fitzwalter Capital Partners (UK Assetco) Limited | Financial services | 2024 |
| FIX UP Barbershops Ltd | Other services | 2025 |
| FKA Construction UK Ltd | Construction | 2018 |
| FKA Interiors Design Ltd | Professional & scientific | 2019 |
| FKA Plumbing & Heating Ltd | Construction | 2021 |
| Flaming Barrel Ltd | Professional & scientific | 2022 |
| Flaming Fowl Studios Ltd | Information & communication | 2016 |
| Flamingoworx Ltd | Professional & scientific | 2025 |
| Flashbulb Consulting Ltd | Professional & scientific | 2009 |
| Flat 2 the Squirrels Ltd | Real estate | 2025 |
| Flat 3 the Squirrels Ltd | Real estate | 2025 |
| Flat 4 the Squirrels Ltd | Real estate | 2025 |
| Fleetwood Finance Limited | Professional & scientific | 2004 |
| Fleshman Britwell Ltd | Wholesale & retail | 2025 |
| Fletchasketch Limited | Arts & recreation | 2022 |
| Flex Electrical Ltd | Construction | 2017 |
| Flex Technologies Limited | Wholesale & retail | 2011 |
| Flexible Finance Solutions Limited | Professional & scientific | 2024 |
| Flexichannels Limited | Professional & scientific | 2011 |
| Flic Creative Limited | Information & communication | 2013 |
| Flight 7 Limited | Education | 2010 |
| Flight Opco Limited | Hospitality | 2014 |
| Flightcase Bars Limited | Wholesale & retail | 2021 |
| FLO. Smart Properties Ltd | Information & communication | 2024 |
| Floating Duck Limited | Administrative & support | 2002 |
| Flora Property Ltd | Real estate | 2014 |
| Floralscapes Ltd | Wholesale & retail | 2015 |
| Floralscapes Nurseries Ltd | Wholesale & retail | 2020 |
| Florin Care Limited | Health & social care | 2021 |
| Flourish Lotus Co Ltd | Other services | 2024 |
| Flourishing Consulting Limited | Professional & scientific | 2019 |
| Flower Property Developments Limited | Construction | 2024 |
| Flower Walk Limited | Professional & scientific | 2022 |
| Flowerkittle Architects Ltd | Professional & scientific | 2017 |
| Flowerpot Entertainment Limited | Arts & recreation | 2020 |
| Fluent Contracting Ltd | Construction | 2019 |
| Fluffy Bums Groom Room Ltd | Other services | 2022 |
| Flux Threads Fashion Ltd | Wholesale & retail | 2026 |
| Flux-Uk Limited | Information & communication | 2015 |
| Fluxforge Ltd | Wholesale & retail | 2025 |
| FLY ME to the Groom Limited | Transport & logistics | 2026 |
| Flying Colours Contracts Limited | Other services | 1997 |
| Flynn Bespoke Developments Limited | Construction | 2022 |
| Flynn Bespoke Properties Limited | Real estate | 2020 |
| FM Scaffolding Limited | Construction | 2018 |
| FMC Consulting Ltd | Professional & scientific | 2024 |
| FMH Project Ltd | Professional & scientific | 2019 |
| Fmrpuk Ltd | Professional & scientific | 2021 |
| Foam Busters Ltd | Construction | 2022 |
| Foam Combat Command Ltd | Arts & recreation | 2025 |
| FOB (Cranleigh) LLP | | 2005 |
| Focus Petroleum Services Ltd | Professional & scientific | 2017 |
| Folgate Consulting Limited | Professional & scientific | 2013 |
| Folklore Ventures Ltd | Wholesale & retail | 2024 |
| Fontibus Ltd | Construction | 2024 |
| Fontile Limited | Real estate | 2002 |
| Food by Depree Limited | Hospitality | 2015 |
| Food Village (Guildford) Ltd | Hospitality | 2017 |
| Football Focus in Schools Limited | Arts & recreation | 2001 |
| Football Lottery Foundation Limited | Arts & recreation | 2021 |
| Football Media PVT Limited | Professional & scientific | 2010 |
| Football Media Sponsorship Ltd | Professional & scientific | 2018 |
| Football Media Sports Management Limited | Arts & recreation | 2019 |
| Footfall Tech Limited | Construction | 2023 |
| Footfallcam UK Limited | Information & communication | 2002 |
| FOR Earth's Sake CIC | Wholesale & retail | 2018 |
| Foracrest Limited | Construction | 1990 |
| Forcepoint Cloud Limited | Information & communication | 2002 |
| Fordbank Limited | Hospitality | 1986 |
| Fordlaw Limited | Professional & scientific | 2015 |
| Foremost Formwork Ltd | Construction | 2020 |
| Foresee Cube Limited | Wholesale & retail | 2025 |
| Foresee Tech Limited | Wholesale & retail | 2021 |
| Foresight Sports Limited | Extraterritorial | 2013 |
| Forest and Garden Timber Services Ltd | Agriculture & fishing | 2026 |
| Forest Green Farming Ltd. | Agriculture & fishing | 2024 |
| Forester Estates Ltd. | Construction | 2004 |
| Forever Homes (Southern) Ltd | Real estate | 2009 |
| Forever Young Leisure Ltd | Arts & recreation | 2024 |
| Forge on the Green Limited | Hospitality | 2021 |