| Eynsham Limited | Construction | 2016 |
| Eynsham Park Limited | Extraterritorial | 1990 |
| Eynsham Park Padel Club Ltd | Arts & recreation | 2026 |
| F & H Construction (Oxon) Limited | Construction | 2026 |
| F and G Transport Management Limited | Professional & scientific | 2025 |
| F&Y Consultancy Ltd | Professional & scientific | 2025 |
| F. Church Limited | Construction | 1987 |
| F.J. Payne & SON Limited | Manufacturing | 1996 |
| F.W. Looker (Witney) Limited | Real estate | 1946 |
| F4F Design Limited | Professional & scientific | 2008 |
| Fabulous Flowers Holdings Limited | Financial services | 2023 |
| Fabulous Flowers Limited | Other services | 2010 |
| Face for Soul Ltd | Other services | 2019 |
| Factor T Limited | Professional & scientific | 1997 |
| Factoti Limited | Manufacturing | 2006 |
| Faded Craft Ltd | Other services | 2023 |
| Fairies at the Bottom of the Garden Ltd | Arts & recreation | 2026 |
| Fairseat Carterton (Management Company) Limited | Households | 2022 |
| Fairspear Holdings Limited | Financial services | 2021 |
| Fairview Cattery Ltd | Other services | 2023 |
| Fairview Cattery RTW Limited | Other services | 2025 |
| Fairy Farming Limited | Agriculture & fishing | 2016 |
| Family Practice Group Limited | Health & social care | 2021 |
| FAR Horizons Marketing Limited | Administrative & support | 2009 |
| Faringdon Cars Limited | Transport & logistics | 2018 |
| Farm to Fork Inns Ltd | Hospitality | 2015 |
| Farmer & SON Heating and Plumbing Ltd | Construction | 2018 |
| Farmoor Plumbing Limited | Construction | 2021 |
| FASCINATION4FOOD Ltd | Wholesale & retail | 2021 |
| Fasciopathy Research and CAF Ltd | Health & social care | 2024 |
| Fastminds AI Ltd | Administrative & support | 2025 |
| Faulkner FAM Property Management Ltd | Real estate | 2026 |
| Faulkner Windows Ltd | Construction | 2022 |
| FBN Properties LLP | | 2006 |
| FCP Group Limited | Education | 2025 |
| FD Resources Limited | Professional & scientific | 2022 |
| FDV Ventures Ltd | Professional & scientific | 2026 |
| Fear Industries Ltd | Hospitality | 2025 |
| Feather & Feather Ltd | Hospitality | 2018 |
| Fego Bakehouse Limited | Hospitality | 2024 |
| Fego Beaconsfield Limited | Hospitality | 2017 |
| Fego Caffe Ascot Limited | Hospitality | 2005 |
| Fego Caffe Cobham Limited | Hospitality | 2009 |
| Fego Caffe Gerrards Cross Limited | Hospitality | 2007 |
| Fego Caffe Marlow Limited | Hospitality | 2004 |
| Fego Caffe Sunningdale Limited | Hospitality | 2002 |
| Fego Esher Ltd | Hospitality | 2022 |
| Fego Innovation Hub Limited | Hospitality | 2009 |
| Fego Operations Limited | Financial services | 2006 |
| Fego Restaurants Limited | Hospitality | 2010 |
| Feltec Roofing Services Ltd | Construction | 2024 |
| Fergal Holdings Limited | Professional & scientific | 2014 |
| Fergus & Fleur Ltd | Manufacturing | 2013 |
| Ferlee Investments Limited | Real estate | 2025 |
| Fidgital Ltd | Wholesale & retail | 2025 |
| Fiendish Ltd | Information & communication | 2013 |
| Fifteen Years Ltd | Financial services | 2010 |
| Fifty Twenty Two Limited | Financial services | 2023 |
| Fillymoe Holdings Limited | Financial services | 2020 |
| Fillymoe Limited | Manufacturing | 2002 |
| Filosofy Ltd | Administrative & support | 2020 |
| Final Dental LAB Ltd | Manufacturing | 2023 |
| Find My Inner Calm Limited | Health & social care | 2024 |
| Findlay & Friends Ltd | Other services | 2025 |
| Fine Print (Services) Limited | Manufacturing | 1990 |
| Fine Print Holdings Limited | Financial services | 2003 |
| Finedco Ltd | Wholesale & retail | 2023 |
| Finery Blvd Ltd | Wholesale & retail | 2025 |
| Finesse Group (UK) Holdings Limited | Extraterritorial | 2022 |
| Finsbury Consultants Ltd | Financial services | 2025 |
| Fircroft Private Apartments Limited | Households | 2006 |
| Fire & Wine Ltd | Wholesale & retail | 2023 |
| Firebird Investments Ltd | Financial services | 2009 |
| Fireheart Coffee Roasters Ltd | Wholesale & retail | 2020 |
| Firestarter Nepal Ltd | Wholesale & retail | 2026 |
| First and Last Mile C.I.C. | Transport & logistics | 2020 |
| First for Plants Limited | Wholesale & retail | 2016 |
| Fiscalis Management Limited | Professional & scientific | 2002 |
| Fiscalis Strategic Consulting Limited | Professional & scientific | 2012 |
| Fishers Fish Carriage (Oxford) Limited | Wholesale & retail | 1999 |
| Fit & FAB Fit for Life Ltd | Wholesale & retail | 2020 |
| FIT2RUN (Topsport) Ltd | Wholesale & retail | 2015 |
| Five Comms Ltd | Professional & scientific | 2024 |
| Fixifyhub Ltd | Wholesale & retail | 2026 |
| Fkmt Limited | Real estate | 2020 |
| Fksw Limited | Health & social care | 2026 |
| Flareexpert Ltd | Information & communication | 2022 |
| Flash of Splendour Arts CIC | Arts & recreation | 2009 |
| Flat 2 Langdale Gate (Witney) Limited | Households | 1999 |
| Fletcher Leatherworks Limited | Manufacturing | 2025 |
| Flexible FD Services Limited | Professional & scientific | 2022 |
| Flexrents Ltd | Administrative & support | 2025 |
| Flintandfigg Ltd | Construction | 2025 |
| Flintlock Property Ltd | Real estate | 2024 |
| Flourishing Futures Oxford Limited | Health & social care | 2026 |
| Flux Global Limited | Other services | 2018 |
| FLUX2FUSION Software Limited | Information & communication | 2001 |
| FLY Ltd | Information & communication | 2005 |
| Flybeale Ltd | Transport & logistics | 2025 |
| Focus Office Equipment Limited | Information & communication | 1981 |