| Fantazy Rocks UK Ltd | Wholesale & retail | 2020 |
| Faramir Creation Ltd | Information & communication | 2023 |
| Farfesh Limited | Hospitality | 2017 |
| Farm Fried Chicken Burgers and Pizzas Limited | Hospitality | 2019 |
| Faro Business Analytics Ltd | Information & communication | 2018 |
| Farzay Holdings Limited | Real estate | 2023 |
| Faso Dream Construction Limited | Construction | 2023 |
| Fast Response Security Limited | Administrative & support | 2025 |
| Fauzhan Real Estate Limited | Real estate | 2012 |
| FDC Construction Ltd | Construction | 2015 |
| Feasted Foods Limited | Hospitality | 2026 |
| Feel Lavish Limited | Other services | 2024 |
| Feex Consultancy Limited | Professional & scientific | 2014 |
| Feltham Tuition Ltd | Education | 2020 |
| Fenpro Limited | Construction | 2008 |
| Fernarr Consultancy Ltd | Professional & scientific | 2018 |
| Fery's Dreamworld Limited | Arts & recreation | 2025 |
| FH Consulting Limited | Extraterritorial | 2015 |
| Fieldstone Advisors Limited | Professional & scientific | 2021 |
| Fieldwork Clothing Project Limited | Wholesale & retail | 2026 |
| Film Art Limited | Information & communication | 2016 |
| Filmy Gems Ltd | Information & communication | 2017 |
| Finance Director Services Ltd | Professional & scientific | 2025 |
| Finance Talk Limited | Professional & scientific | 2025 |
| FINANCES4YOU Limited | Professional & scientific | 2015 |
| Fine Work Services Ltd | Other services | 2025 |
| Fiona Neilson Limited | Information & communication | 2023 |
| Fiona White Consulting Limited | Professional & scientific | 2025 |
| Fiorito Limited | Construction | 2008 |
| Fire Skilled Ltd | Construction | 2018 |
| Firestar Accounting Limited | Construction | 2009 |
| First Degree Limited | Wholesale & retail | 2002 |
| First Degree Properties Limited | Real estate | 2019 |
| First Floor Construction Ltd | Construction | 2022 |
| First Heights Limited | Real estate | 2005 |
| First in Music Ltd | Arts & recreation | 2009 |
| First Initiate Service Limited | Financial services | 2016 |
| First Pick Goods Ltd | Wholesale & retail | 2025 |
| FIRST4LANDLORDS Limited | Real estate | 2017 |
| FIX Motor Bike Ltd | Wholesale & retail | 2024 |
| FIX Networks Ltd | Information & communication | 2019 |
| Flair London Ltd | Wholesale & retail | 2024 |
| Flamin APE Limited | Professional & scientific | 2009 |
| Fleming Mechanical Limited | Construction | 2015 |
| Flexipipe Engineering Solutions Limited | Professional & scientific | 2010 |
| Flim City Ltd | Administrative & support | 2021 |
| Flock 57 Ltd | Professional & scientific | 2021 |
| Flossin Ltd | Information & communication | 2025 |
| Flowstate Fitness Coaching Ltd | Arts & recreation | 2025 |
| Flyafrica Airways Ltd | Transport & logistics | 2023 |
| FMA Group Holdings Ltd | Professional & scientific | 2026 |
| FO Consulting Limited | Professional & scientific | 2018 |
| Focus Foods Ltd | Hospitality | 2026 |
| Foley Fest CIC | Arts & recreation | 2025 |
| FOLIO5 Ltd | Professional & scientific | 2024 |
| Food With Love CIC | Hospitality | 2020 |
| Formatt Film Services Limited | Administrative & support | 2025 |
| Fortis Resources Ltd | Financial services | 2023 |
| Fortuna London Properties Limited | Hospitality | 2026 |
| Forum Energy Services Limited | Mining & quarrying | 2015 |
| Foundar Ltd | Professional & scientific | 2025 |
| Four Aces Trading Limited | Wholesale & retail | 2022 |
| Four Pillars PUB & Grill Ltd | Hospitality | 2025 |
| FOX and Squirrel (Isleworth) Ltd | Health & social care | 2023 |
| Foxwell Properties Limited | Real estate | 2016 |
| Fragmented Studio Ltd | Information & communication | 2025 |
| Frame Hospitality Ltd | Professional & scientific | 2025 |
| Framir Limited | Real estate | 2023 |
| Francis Smith Flowers Ltd | Wholesale & retail | 2018 |
| Frasa Enterprises Limited | Hospitality | 2025 |
| Fred Adair Media Ltd | Information & communication | 2019 |
| Freddie Webster Ltd | Administrative & support | 2025 |
| Freshway Meat Ltd | Wholesale & retail | 2018 |
| FRG Services Limited | Construction | 2017 |
| Friends of Isleworth Station CIC | Health & social care | 2025 |
| Fringe Buildings Construction Private Ltd | Construction | 2023 |
| Frontier Botanics Ltd | Wholesale & retail | 2019 |
| Frontier Diagnostics Ltd | Professional & scientific | 2022 |
| Fruit & VEG MA Limited | Wholesale & retail | 2021 |
| Fruit and Barley Limited | Construction | 2017 |
| FS Drinks Limited | Manufacturing | 2022 |
| FSP London Limited | Wholesale & retail | 2016 |
| FSV Love Ltd | Transport & logistics | 2026 |
| Full-Funnel Marketing Solutions Ltd | Professional & scientific | 2020 |
| Funomal Ltd | Wholesale & retail | 2023 |
| Future Dynamics Ltd | Information & communication | 2021 |
| Future Itech Solutions Ltd | Real estate | 2024 |
| Future Media Consulting Limited | Professional & scientific | 2016 |
| Future Tech Training and Services Ltd | Information & communication | 2026 |
| Futurepath AI Ltd | Information & communication | 2026 |
| Fyltre Ltd | Information & communication | 2026 |
| G&J Trade & Consulting Private Limited | Wholesale & retail | 2020 |
| G. P. Motors (Teddington) Ltd | Manufacturing | 2012 |
| G.O.A.T.S.Bbq Ltd | Hospitality | 2019 |
| G14 Solutions Limited | Information & communication | 2026 |
| Gainland Properties Limited | Professional & scientific | 1992 |
| GAJ Developments Limited | Real estate | 2015 |
| GAJ Homes Ltd | Real estate | 2015 |
| GAJ Property Investments Ltd | Real estate | 2011 |
| GAJ Property Management Limited | Real estate | 2014 |