| Fleetdesk Ltd | Information & communication | 2026 |
| Fleetnet Limited | Information & communication | 1994 |
| Fleming Way Limited | Hospitality | 2024 |
| Flight Deck Strategic Solutions Ltd | Professional & scientific | 2025 |
| Flitwick Curry Limited | Hospitality | 2025 |
| Flitwick Executive Cars Ltd | Transport & logistics | 2023 |
| Flitwick Glass Services Limited | Construction | 2013 |
| Flitwick Motors (Repairs) Limited | Wholesale & retail | 2001 |
| Florea Transport Logistic Ltd | Transport & logistics | 2025 |
| Florentin Craciun Limited | Transport & logistics | 2016 |
| Florin & Florin Limited | Extraterritorial | 2009 |
| Floss and Smile Ltd | Health & social care | 2013 |
| Flow Digital Transformation Limited | Information & communication | 2026 |
| Flow Skin and Wellness Ltd | Health & social care | 2026 |
| Flowers by Hannah Limited | Wholesale & retail | 2026 |
| Flushing Property LLP | | 2023 |
| FLY Drive Ltd | Transport & logistics | 2022 |
| FLY Smart Club Ltd | Information & communication | 2026 |
| Fmotion Limited | Professional & scientific | 2023 |
| Fnfp Ltd | Hospitality | 2025 |
| Focal Events Group Ltd | Hospitality | 2026 |
| Focus Point Group Ltd | Professional & scientific | 2026 |
| Fodderbite Limited | Professional & scientific | 2023 |
| Fomo Social Limited | Information & communication | 2025 |
| Food HUT Dunstable Ltd | Hospitality | 2018 |
| Foody Limited | Real estate | 2019 |
| Footology Ltd | Health & social care | 2014 |
| Fopalt Limited | Real estate | 1960 |
| FOR the Love of Food Catering Ltd | Hospitality | 2024 |
| Forde Freight Limited | Transport & logistics | 2015 |
| Foreman Snags Academy Limited | Education | 2024 |
| Foreman Snags Limited | Manufacturing | 2016 |
| Forest Computer Solutions Limited | Information & communication | 2003 |
| Forest Education Services Ltd | Administrative & support | 2026 |
| Forever MAY Aesthetics Ltd | Other services | 2023 |
| Form E Forensics Limited | Extraterritorial | 2012 |
| Formedline Ltd | Transport & logistics | 2025 |
| Fortem Digital Limited | Information & communication | 2016 |
| Fountains View Limited | Hospitality | 2017 |
| Four Seasons Coaches Limited | Transport & logistics | 2017 |
| Four Seasons Farming Limited | Extraterritorial | 2003 |
| Foursquare Church (Great Britain) | Professional & scientific | 1998 |
| Fourways MGT Ltd | Health & social care | 2024 |
| FOX and the Hounds Ltd | Other services | 2022 |
| Foxcars Ltd | Wholesale & retail | 2026 |
| Foxhill Equestrian Limited | Other services | 1998 |
| Foxmoreco Ltd | Information & communication | 2025 |
| Foxon Consulting Services Ltd | Information & communication | 2011 |
| Foxwood Building Guarantee Ltd | Financial services | 2015 |
| Fozia Shah Limited | Health & social care | 2008 |
| FPM Project Ltd | Construction | 2018 |
| FPR Construction Limited | Construction | 2019 |
| FRA Investments Limited | Construction | 2019 |
| Franco Cuts Limited | Other services | 2023 |
| Francom (London) Ltd | Information & communication | 2007 |
| Franks Garden Maintenance Limited | Administrative & support | 2019 |
| Frazer Scaffolding Ltd | Construction | 2024 |
| FRC Storage Limited | Extraterritorial | 2013 |
| Free Thinking Human Ltd | Extraterritorial | 2011 |
| Fresh Horizon Consultancy Limited | Professional & scientific | 2023 |
| Fretus Transport and Recovery Services Limited | Transport & logistics | 1990 |
| From the Hearts of Africa Ltd | Wholesale & retail | 2025 |
| Frontier Rags Ltd. | Wholesale & retail | 2026 |
| Frontline Events Ltd | Arts & recreation | 2019 |
| Frosty Haze Limited | Agriculture & fishing | 2026 |
| Froth 'N' Elbow Limited | Hospitality | 2001 |
| Fruit Based Software Limited | Information & communication | 2012 |
| Fruitful Property Investments Ltd | Real estate | 2021 |
| FSL Fire and Security Limited | Administrative & support | 2026 |
| Fsmuk Ltd | Professional & scientific | 2021 |
| Ftmb Holdings Limited | Real estate | 2020 |
| FTP Motorsport Ltd | Wholesale & retail | 2020 |
| FTR Performance Ltd | Wholesale & retail | 2018 |
| Fully Design Ltd | Information & communication | 2024 |
| Fumsi Limited | Information & communication | 2000 |
| Fusion Express Limited | Hospitality | 2020 |
| Fusion Splice Limited | Construction | 2000 |
| Fusion Therapeutic Coaching Limited | Health & social care | 2012 |
| Fusionmech Solutions Ltd | Construction | 2024 |
| Future Access Scaffolding Ltd | Construction | 2025 |
| Future Green Developments Limited | Construction | 2021 |
| Future of Heating Ltd | Construction | 2026 |
| Futuredesh Limited | Professional & scientific | 2024 |
| Futurelet Property Solutions Ltd | Real estate | 2025 |
| FX17 Ltd | Construction | 2024 |
| G & C ALL in One Limited | Transport & logistics | 2007 |
| G & C Weoley Exim Ltd | Wholesale & retail | 2024 |
| G & J a Heeps (Transport) Limited | Transport & logistics | 2001 |
| G & J Groundwork Contractors Limited | Construction | 2020 |
| G & J Groundwork Limited | Construction | 2015 |
| G & J Group of Companies Limited | Financial services | 2023 |
| G C M Distribution Limited | Transport & logistics | 2003 |
| G M Frazer Tree Surgery Ltd | Agriculture & fishing | 2025 |
| G Mihalachi Ltd | Construction | 2013 |
| G N Contractors Ltd | Construction | 2019 |
| G Sake Company Limited | Wholesale & retail | 1993 |
| G&A Fast Food Houghton Regis Ltd | Hospitality | 2026 |
| G&D Builders Limited | Construction | 2021 |
| G&E Residential Ltd | Real estate | 2026 |
| G&Gn Properties Ltd | Extraterritorial | 2021 |