| Feltham Coachworks Limited | Wholesale & retail | 1992 |
| Fergali Ltd | Information & communication | 2008 |
| Fermac Cargo United Kingdom Ltd | Transport & logistics | 2016 |
| Fernart Services Ltd | Construction | 2025 |
| Feronex Global Resources Ltd | Wholesale & retail | 2026 |
| Feryal Limited | Hospitality | 2019 |
| Fgcwo Investments LLP | | 2019 |
| FGZ Cosmetics Ltd | Wholesale & retail | 2023 |
| Fieldend Residents Association Limited | Households | 1960 |
| Fifth Cross Limited | Real estate | 2015 |
| Fighting Productions Ltd | Information & communication | 2022 |
| Figjam Props Ltd | Information & communication | 2017 |
| FIL Resources Limited | Financial services | 1996 |
| Film Haus Ltd | Information & communication | 2020 |
| Filmtech Ltd | Other services | 2012 |
| Filzmoos Appartments Ltd | Hospitality | 2018 |
| FIM Advisory Ltd | Professional & scientific | 2022 |
| Finance Bros Ltd | Financial services | 2019 |
| Fincom Consultancy Ltd | Information & communication | 2014 |
| Find Web Tech Ltd | Information & communication | 2023 |
| Fine & Country Ascot Limited | Real estate | 2021 |
| Fine & Country BW Limited | Real estate | 2023 |
| Fine & Country Prime Surrey Limited | Real estate | 2021 |
| Fine & Country Richmond Limited | Real estate | 2019 |
| Fine Chauffeurs Ltd | Transport & logistics | 2021 |
| Fine Foods (London) Limited | Hospitality | 2021 |
| Finesse Property Management Limited | Construction | 2005 |
| Finfit AI Ltd | Information & communication | 2026 |
| Finnkor Ltd | Information & communication | 2014 |
| Finsight Technologies Ltd | Information & communication | 2014 |
| Fiore Ltd | Transport & logistics | 2011 |
| Firemint Limited | Manufacturing | 2015 |
| Firewater Productions Limited | Information & communication | 2005 |
| Firm Foundations for Children and Adolescents C.I.C. | Education | 2003 |
| Firm Property Ltd | Hospitality | 2015 |
| Firmalytics Limited | Information & communication | 2025 |
| First Cross Limited | Information & communication | 2017 |
| First Horizon Construction Ltd | Construction | 2025 |
| First Niyyah Ltd | Information & communication | 2026 |
| First Swim Limited | Education | 2016 |
| Fistal Limited | Professional & scientific | 2022 |
| Fitness-Tech Ltd | Arts & recreation | 2022 |
| Fitvits (IP) Limited | Manufacturing | 2023 |
| Five Fish Limited | Manufacturing | 2003 |
| Five Riverdale Ltd | Households | 2026 |
| Fizzbar Retail Ltd | Hospitality | 2014 |
| FJ Cudmore Ltd | Professional & scientific | 2015 |
| FK (Bristol) Limited | Professional & scientific | 2023 |
| FKV (Bristol) Ltd | Professional & scientific | 2025 |
| FL Labs Ltd | Information & communication | 2023 |
| FL Trading Limited | Hospitality | 2008 |
| Flame 47 Limited | Information & communication | 2003 |
| Flamefish Media Ltd | Administrative & support | 2010 |
| Flamenco Ninja Ltd | Administrative & support | 2017 |
| Flames of Richmond Ltd | Construction | 2016 |
| Fleetvp Ltd | Professional & scientific | 2026 |
| FLEX/50 Limited | Information & communication | 2014 |
| Flexifitt Ltd | Professional & scientific | 2025 |
| Flight Life Ltd | Administrative & support | 2020 |
| Flipside Coaching Ltd | Administrative & support | 2019 |
| Flizang Properties Ltd | Real estate | 2026 |
| FLO Advisory Limited | Professional & scientific | 2025 |
| Floral Holdings Limited | Administrative & support | 1986 |
| Flourish AI Advisory Limited | Professional & scientific | 2025 |
| Flow Mach Ltd | Wholesale & retail | 2026 |
| Flow State Logistics Ltd | Transport & logistics | 2025 |
| Flowers by Anita Ltd | Wholesale & retail | 2025 |
| Fluid PUB Group Limited | Hospitality | 2003 |
| FM Labs Limited | Information & communication | 2026 |
| Focus LLC Ltd | Professional & scientific | 2023 |
| Focus Scaffolding Ltd | Construction | 2022 |
| Focuslock Limited | Real estate | 2010 |
| FOG Logistics Ltd | Administrative & support | 2017 |
| Fons Well-Being Limited | Health & social care | 2025 |
| Food Bench Ltd | Manufacturing | 2017 |
| Food Land London Limited | Wholesale & retail | 2017 |
| Foolanas Limited | Arts & recreation | 2019 |
| Football Linx Ltd | Arts & recreation | 2026 |
| Foraus Ltd | Wholesale & retail | 2022 |
| Forbes Hunter Hawley Ltd | Information & communication | 2026 |
| Fordy Pictures Limited | Arts & recreation | 2017 |
| Foreign Objects Studios Ltd | Information & communication | 2025 |
| Foreign Stones Ltd | Construction | 2020 |
| Forest Corner Consulting Ltd | Information & communication | 2024 |
| Forgespring Ltd | Information & communication | 2026 |
| Formula Estates Ltd | Real estate | 2021 |
| Forthview Technology Ltd | Information & communication | 1999 |
| Fortitude Arts Ltd | Professional & scientific | 2025 |
| Fortune Group of Properties Ltd | Real estate | 2021 |
| Fortwell Ltd | Real estate | 2025 |
| Forwardlease Property Management Limited | Households | 2000 |
| Foster Creative Ltd | Information & communication | 2025 |
| Foundry Cars Limited | Wholesale & retail | 2003 |
| Four H Ltd | Professional & scientific | 2014 |
| Four Leaf Clover Productions Limited | Information & communication | 2026 |
| Four Square Court Management Co. Limited | Real estate | 1982 |
| Four-Tex Clothing and Home Textile Ltd | Wholesale & retail | 2022 |
| Fourfour+ Limited | Information & communication | 2025 |
| Fourned Limited | Hospitality | 2025 |
| FOX Alloys Limited | Wholesale & retail | 2024 |