| Flamefx Ltd | Energy | 2007 |
| Flameout International Limited | Construction | 2008 |
| Flaming Grill and Peri Peri Ltd | Hospitality | 2020 |
| Flaming House Ltd | Hospitality | 2019 |
| Flare & Tower Inspection Services Limited | Construction | 2015 |
| Flaunden Stables Ltd | Other services | 2019 |
| Flava Foods Ltd | Wholesale & retail | 2018 |
| Flavorfix Limited | Hospitality | 2024 |
| Flavourz of Ghana Ltd | Hospitality | 2019 |
| FLB Logistics Ltd | Transport & logistics | 2019 |
| Fleetbox Telematics Ltd | Information & communication | 2017 |
| Fleetwave Logistics Ltd | Transport & logistics | 2025 |
| Fleming Consultancy Services Limited | Professional & scientific | 2007 |
| Flemish Fields Management Company Limited | Households | 1982 |
| Fletcher Way Car Wash Ltd | Other services | 2019 |
| Flex Accounting Services Ltd | Professional & scientific | 2007 |
| Flicker of Gold Ltd | Professional & scientific | 2022 |
| Flintstone Solutions UK Limited | Construction | 2011 |
| Flinty's Limited | Professional & scientific | 2023 |
| Floating Duck Records Ltd | Information & communication | 2025 |
| Florere Inc Limited | Wholesale & retail | 2024 |
| Florin Contractors Limited | Construction | 2024 |
| Flow Trustees Limited | Information & communication | 2016 |
| Flow UK Holdings Limited | Financial services | 2015 |
| Flowcraft Groundworks Ltd | Water & waste | 2023 |
| Flower Pots Day Nursery Childcare Ltd | Health & social care | 2018 |
| Flowerwalls of London Limited | Administrative & support | 2018 |
| Flowpass Limited | Transport & logistics | 2025 |
| Flowzaics Ltd | Professional & scientific | 2020 |
| Fluid Technology Solutions Ltd | Information & communication | 2024 |
| FLY With Flair Aviation Services Ltd | Professional & scientific | 2025 |
| Flycheapestonline Limited | Administrative & support | 2019 |
| Flying Mobula Films Ltd | Information & communication | 2017 |
| Flying Stone Ltd | Wholesale & retail | 2012 |
| Flypack Property Management Company Limited | Households | 1990 |
| FM Hardy Electrical Ltd | Construction | 2022 |
| FMC Motors Ltd | Wholesale & retail | 2019 |
| FMG Direct Ltd | Professional & scientific | 2008 |
| FMP IR Limited | Professional & scientific | 2013 |
| FNS Limited | Information & communication | 2004 |
| Focus Design and Create Limited | Construction | 2025 |
| Focus Operations Limited | Real estate | 2023 |
| Fola Property Services Limited | Real estate | 2024 |
| Foldx E-Scooters Ltd | Manufacturing | 2025 |
| Foleshill Cash&Curry Ltd | Extraterritorial | 2025 |
| Foliobridge Limited | Information & communication | 2018 |
| Folium Management Company Limited | Households | 2011 |
| Fondcroft Services Limited | Construction | 1977 |
| Fontwell Meadows Estate (Block a) Management Company Limited | Real estate | 2021 |
| Fontwell Meadows Estate (Block H) Management Company Limited | Real estate | 2021 |
| Fontwell Meadows Estate (Blocks F & G) Management Company Limited | Real estate | 2021 |
| Fontwell Meadows Estate Management Company Limited | Households | 2021 |
| Food WE Trust Ltd | Hospitality | 2016 |
| Foodevo Limited | Hospitality | 2024 |
| Foodopia UK Ltd | Wholesale & retail | 2021 |
| Foodplease Limited | Hospitality | 2024 |
| Foodpol Ltd | Wholesale & retail | 2019 |
| Foodsign Limited | Hospitality | 2024 |
| Football Quest Ltd | Arts & recreation | 2025 |
| FOR Life Care Ltd | Health & social care | 2018 |
| FOR the Love of the Frame Ltd | Wholesale & retail | 2020 |
| Forbes Blinds and Shutters Ltd | Construction | 2020 |
| Forbes Young (London) Limited | Professional & scientific | 2012 |
| Forde & Mchugh Limited | Construction | 1973 |
| Forest and I Group Ltd | Wholesale & retail | 2021 |
| Forest Chase Management Company Ltd | Households | 2019 |
| Forest Edge (Fordingbridge) Management Company Limited | Households | 2022 |
| Forever Flowers 4 Hire Ltd | Other services | 2023 |
| Forexcel Ltd | Financial services | 2026 |
| Forfeit Fantasy Draft Ltd | Information & communication | 2025 |
| Forge Gym Studio Ltd | Arts & recreation | 2025 |
| Forge Media Ltd | Information & communication | 2021 |
| Forrest View Takeley Limited | Households | 2021 |
| Fortis Construction Limited | Construction | 2010 |
| Fortune Security Limited | Administrative & support | 2016 |
| Forty Five Degrees Ltd | Professional & scientific | 2015 |
| Foster Signalling Solutions Ltd | Construction | 2026 |
| Foto Careplus Ltd | Health & social care | 2018 |
| Found. Fabulous Ltd | Wholesale & retail | 2026 |
| Foundry Court (Wokingham) Management Limited | Households | 2014 |
| Fountain Healthcare Solutions Limited | Professional & scientific | 2010 |
| Four Acres Electrical Services Ltd | Construction | 2014 |
| Four Chestnuts Management Co Limited | Households | 2005 |
| Four Hair Design Limited | Other services | 2013 |
| Four Seasons Energy UK Limited | Wholesale & retail | 2019 |
| Fourdec Property Ltd | Real estate | 2021 |
| Fourtrax Automotive Limited | Wholesale & retail | 2016 |
| FOX DEN Nursery Ltd | Education | 2024 |
| FOX Drylining Ltd | Construction | 2019 |
| Foxburn Ltd | Professional & scientific | 2026 |
| Foxy Drylining Limited | Construction | 2026 |
| FP Trans Ltd | Transport & logistics | 2018 |
| Fpdn Holdings Limited | Financial services | 2023 |
| Fpdn Premises Limited | Real estate | 2023 |
| Fral Investment Ltd | Real estate | 2024 |
| Frank Skilled Ltd | Administrative & support | 2019 |
| Franklin & Greatorex Limited | Arts & recreation | 2014 |
| Fraser Munro Ltd | Administrative & support | 2010 |
| Freddie Lewis Transport Ltd | Transport & logistics | 2025 |
| Free Education Ltd | Education | 2025 |