| Feldon Valley (UK) Limited | Arts & recreation | 2013 |
| Feldon Valley C.I.C. | Hospitality | 2018 |
| Fellowship Hairdressing Limited | Other services | 2010 |
| Fellowship Limited | Administrative & support | 1995 |
| Fellworld Limited | Extraterritorial | 1994 |
| Fenbury Plumbing and Heating Limited | Construction | 2018 |
| Fenda Solutions Ltd | Manufacturing | 2021 |
| FER Transport Ltd | Transport & logistics | 2016 |
| Fergus Software Ltd | Information & communication | 2018 |
| Fermor Construction Ltd | Construction | 2007 |
| Fern & Field Antiquarian Books Ltd | Wholesale & retail | 2026 |
| Fernhill Estates Cattle END Ltd | Real estate | 2021 |
| Fernhill Estates Silverstone Ltd | Real estate | 2020 |
| Fernhill Land Holdings Ltd | Financial services | 2021 |
| Fernside Avenue Management Company Limited | Real estate | 2005 |
| Ferriston Vets Ltd | Professional & scientific | 2024 |
| Festive Promotions Ltd | Wholesale & retail | 2007 |
| FH Transportation Ltd | Transport & logistics | 2024 |
| Fiddlers Elbow Grease Life Limited | Manufacturing | 2017 |
| Field View (Brackley) Management Company Limited | Real estate | 2013 |
| Filip & Manu Ltd | Construction | 2021 |
| Fillosophy Ltd | Professional & scientific | 2018 |
| FIN Real Estate Limited | Real estate | 2015 |
| Finance Director Consultancy Ltd | Professional & scientific | 2018 |
| Finca Group Ltd | Wholesale & retail | 2024 |
| Finco Services Limited | Professional & scientific | 2025 |
| Findley Property Ltd | Households | 2021 |
| Fine Plastering and Tiling Limited | Construction | 2021 |
| Finesstcare Ltd | Health & social care | 2016 |
| Finest Flooring Services Ltd | Construction | 2020 |
| Finlog Developments Limited | Construction | 2008 |
| Finmere Market Limited | Administrative & support | 2003 |
| Finney Mathew Limited | Professional & scientific | 2025 |
| Finvantage Ltd | Information & communication | 2026 |
| Fiona Moon Advisory Limited | Administrative & support | 2022 |
| Firac Ltd | Construction | 2016 |
| Fire Conferences and Exhibitions Ltd | Administrative & support | 2014 |
| Fire Dragon Publishing Ltd | Wholesale & retail | 2026 |
| Fire Experimental Unit Ltd | Professional & scientific | 2013 |
| First Class Chauffeurs Oxford Ltd | Transport & logistics | 2026 |
| First Class Simulations Limited | Arts & recreation | 2004 |
| First Line Limited | Wholesale & retail | 2000 |
| First State Pizza Company Limited | Extraterritorial | 2002 |
| First Time Right Limited | Information & communication | 2018 |
| Firstmove Limited | Transport & logistics | 1986 |
| Fisher Family Company Ltd | Wholesale & retail | 2022 |
| Fit Food Corp Ltd | Other services | 2025 |
| Fit Peeps Ltd | Other services | 2020 |
| FIT4ZERO Ltd | Information & communication | 2025 |
| Five Acres Management Limited | Households | 2007 |
| Five Star Shine Ltd | Administrative & support | 2022 |
| FJS Scientific Consulting Ltd | Professional & scientific | 2026 |
| FL Scaffolding Ltd | Construction | 2022 |
| Flaming Taste Ltd | Hospitality | 2026 |
| Flashbuzz Limited | Information & communication | 2018 |
| Fleet Farm Residents Management Company Limited | Households | 2022 |
| Fletcher Medical Equipment Limited | Manufacturing | 2023 |
| Flexpertise Ltd | Professional & scientific | 2011 |
| Flintstone Property Services Ltd | Real estate | 2025 |
| Flip Base Ltd | Wholesale & retail | 2015 |
| Flip Energy Limited | Energy | 2015 |
| FLO Corp Ltd | Information & communication | 2016 |
| Floor 2 Roof Solutions Ltd | Construction | 2022 |
| Floor IT Direct Limited | Construction | 2008 |
| Floor Restore Oxford Limited | Administrative & support | 2010 |
| Flopatra Ltd | Transport & logistics | 2023 |
| Flora Fairbairn & Co Limited | Arts & recreation | 2021 |
| Florensis Flower Seeds UK Limited | Agriculture & fishing | 2009 |
| Floriography Ltd | Wholesale & retail | 2020 |
| Flow Projects Limited | Construction | 2023 |
| Flowops Consulting Ltd | Information & communication | 2025 |
| Fluid Events Ltd | Administrative & support | 2010 |
| FM Logistics 2025 Ltd | Transport & logistics | 2025 |
| FMJ Autos Ltd | Wholesale & retail | 2022 |
| FMP Decorators Limited | Construction | 2026 |
| FN Electrical Services Ltd | Construction | 2022 |
| Focused Performance Ltd | Professional & scientific | 2024 |
| Follixir Ltd | Wholesale & retail | 2026 |
| Food Diversity Ltd | Hospitality | 2023 |
| Food Plus International Ltd | Wholesale & retail | 2025 |
| Foot Health UK Ltd | Health & social care | 2008 |
| FOR YOU Pubs Limited | Hospitality | 2025 |
| Forecast Technology Limited | Professional & scientific | 2013 |
| Foreman King Limited | Real estate | 2014 |
| Foremost Magnets Limited | Manufacturing | 2006 |
| Foremost Print Limited | Manufacturing | 2015 |
| Forge Coffee (Culworth) Limited | Hospitality | 2022 |
| Forge Coffee LLP | | 2018 |
| Forge Garage (Brailes) Limited | Wholesale & retail | 2007 |
| Forge Labs Ltd | Information & communication | 2022 |
| Forge Valeting Ltd | Administrative & support | 2023 |
| FORGE41 Limited | Information & communication | 2024 |
| Forgemedialab Limited | Information & communication | 2013 |
| Formsmith Ltd | Professional & scientific | 2026 |
| Fornalczyk Property Ltd | Real estate | 2024 |
| Fort Locks Self Storage Ltd | Transport & logistics | 2003 |
| Fortridge Consulting Limited | Professional & scientific | 2002 |
| Fortune Digital Limited | Professional & scientific | 2022 |
| Forward Structural Consultants Ltd | Professional & scientific | 2012 |
| Forz Ltd | Financial services | 2024 |