| Finishline Car Sales Limited | Wholesale & retail | 2011 |
| Finite Event Planning Ltd | Administrative & support | 2025 |
| Fiona Hudson Ltd | Information & communication | 2014 |
| Fireplaces & Heating Direct Limited | Construction | 2004 |
| Firs Hotel Limited(The) | Hospitality | 1979 |
| First Class Assistant Limited | Administrative & support | 2024 |
| First Goal Events Limited | Arts & recreation | 2014 |
| First Goal LLP | | 2023 |
| First Line Events Ltd | Professional & scientific | 2011 |
| First Motion Transmissions Limited | Wholesale & retail | 2016 |
| First SMT Limited | Manufacturing | 1992 |
| First Touch Training Ltd | Education | 1997 |
| Fit Kidz CIC | Health & social care | 2019 |
| Fitz Fine Art Restoration Limited | Arts & recreation | 2026 |
| Fitz Flooring Limited | Construction | 2016 |
| Five Cat Films Ltd | Arts & recreation | 2024 |
| Five Notes Media Services Ltd | Information & communication | 2021 |
| Fixing Salvage Ltd | Wholesale & retail | 2024 |
| Fixture & Automation Design Limited | Professional & scientific | 2009 |
| Flair Electronic Systems Limited | Manufacturing | 1978 |
| Flamingo Design Ltd | Arts & recreation | 2013 |
| Flatwest Holdings Limited | Financial services | 2024 |
| Flatwest Lettings Limited | Real estate | 2024 |
| Flatwest Property Limited | Real estate | 2023 |
| Flawless Equations LLP | | 2023 |
| Fletcher Kirwan & Co Ltd | Construction | 2025 |
| Fletchers Building Solutions Ltd | Construction | 2019 |
| FLO Advisors Ltd | Professional & scientific | 2025 |
| Float Technology Limited | Administrative & support | 2015 |
| Floating Cloud Limited | Professional & scientific | 2012 |
| Floating UK Limited | Health & social care | 2015 |
| Floor Safe Limited | Construction | 2003 |
| Florian Fire Services Limited | Agriculture & fishing | 2013 |
| FLOUR21 Limited | Manufacturing | 2025 |
| Flowers by Daizy Limited | Other services | 2011 |
| Flowmotion Consultancy Limited | Professional & scientific | 2023 |
| Flowright Drainage Limited | Water & waste | 2025 |
| Flowstatescience Ltd | Wholesale & retail | 2025 |
| Fluffles Finance Ltd | Financial services | 2014 |
| Flying Stone Design Ltd | Professional & scientific | 2023 |
| FMC Law Ltd | Information & communication | 2007 |
| FMG Healthcare Consulting Ltd | Professional & scientific | 2022 |
| Fmjc Limited | Professional & scientific | 2021 |
| Focus Consulting Ltd | Professional & scientific | 2016 |
| Focus Healthcare Consulting Ltd | Extraterritorial | 2025 |
| Foldkozi Consulting Ltd | Administrative & support | 2016 |
| Food Rescue Hub CIC | Wholesale & retail | 2021 |
| Food Trade Review Ltd | Information & communication | 2011 |
| Foootie Ltd | Information & communication | 2016 |
| Football FUN Factory (Community 094) Ltd | Arts & recreation | 2023 |
| Footpro Podiatry Limited | Health & social care | 2025 |
| Footy's Foundations Limited | Construction | 2014 |
| Forbes Walker Ltd | Construction | 2018 |
| Force Submission Brazilian JIU Jitsu & MMA Academy Ltd | Arts & recreation | 2021 |
| Forces Affiliation Ltd | Administrative & support | 2024 |
| Forctis Capital Limited | Real estate | 2021 |
| Ford Spare Parts Ltd | Wholesale & retail | 2015 |
| Fordable Group Ltd | Construction | 2024 |
| Forefirst Limited | Health & social care | 2015 |
| Foreman Laws LLP | | 2011 |
| Forestwood Services Ltd | Agriculture & fishing | 2019 |
| Forever 13 Care Ltd | Health & social care | 2023 |
| Forever 13 Properties Ltd | Real estate | 2023 |
| Forever Fairfield Ltd | Real estate | 2020 |
| Forever Unfinished Ltd | Wholesale & retail | 2023 |
| Formation Co. Ltd | Manufacturing | 2022 |
| Fortune & Fortune Consultancy Limited | Professional & scientific | 2012 |
| Fortune Financial Commercial Ltd | Financial services | 2025 |
| Fortune Financial Planning Ltd | Financial services | 2011 |
| Fortune Wills & Estate Planning Ltd | Financial services | 2020 |
| Fotiadis Property Ltd | Real estate | 2021 |
| FOU4 Ltd | Households | 2022 |
| Four Faces Ltd | Real estate | 2022 |
| FOX Driver Ltd | Transport & logistics | 2024 |
| FOX Jones Ltd | Financial services | 2024 |
| Foxtrot Delta Limited | Education | 2010 |
| Foxy Lou’S Boutique Limited | Wholesale & retail | 2024 |
| Fozi Properties Ltd | Real estate | 2022 |
| Fpfp Ltd | Wholesale & retail | 2020 |
| Fprs Plumbing and Drains Limited | Construction | 2013 |
| FR Wellness Limited | Wholesale & retail | 2023 |
| Fraction Consulting Ltd | Professional & scientific | 2024 |
| Fractional Staffing Ltd | Administrative & support | 2026 |
| Fractional Vtalent Limited | Information & communication | 2025 |
| Fraed Associates Limited | Administrative & support | 2024 |
| Fram Executive Search Limited | Administrative & support | 2010 |
| Fram Professionals Limited | Extraterritorial | 2023 |
| Fram Search Limited | Extraterritorial | 2023 |
| Framequake Ltd | Information & communication | 2025 |
| Frances Rose Aviation Limited | Transport & logistics | 2014 |
| Franchise Sales and Resales Ltd | Professional & scientific | 2016 |
| Francos 77 Ltd | Other services | 2005 |
| Frango Properties Ltd | Real estate | 2019 |
| Frankly Design Limited | Professional & scientific | 2019 |
| Franklyn Shaw Associates Limited | Construction | 2010 |
| Fraser & Menna 2.0 Ltd | Education | 2022 |
| Fratelli Homes Limited | Real estate | 2024 |
| Free Bojo Limited | Health & social care | 2024 |
| Freedom 45 Trading Ltd | Wholesale & retail | 2026 |
| Freeman Construction Limited | Construction | 2018 |