| FF Construction Ltd | Construction | 2020 |
| Ffaf Entertainment Limited | Arts & recreation | 2020 |
| Field Farm Fresh Limited | Wholesale & retail | 2019 |
| Field Gardens Flats (Steventon) Management Limited | Households | 1990 |
| Fieldhall Construction Limited | Construction | 2022 |
| Fifty One Point SIX Ltd | Information & communication | 2026 |
| Financial Advice Oxford Ltd | Financial services | 2024 |
| Financialmerrett Limited | Financial services | 2022 |
| Find and Discover ME Limited | Professional & scientific | 2025 |
| Findley Properties Ltd | Real estate | 2015 |
| Findleys Limited | Real estate | 2021 |
| Fine Edge Chefs Ltd | Professional & scientific | 2025 |
| Finer Bedrooms Ltd | Wholesale & retail | 2020 |
| Finley Marsh Racing Limited | Arts & recreation | 2024 |
| Finson Ltd | Real estate | 2022 |
| Fiona Pocock Education Ltd | Education | 2024 |
| Fire-Pro Future Ltd | Other services | 2025 |
| Fire-Pro Ltd | Construction | 2012 |
| Firefly Cage Limited | Arts & recreation | 2006 |
| Firefly Holiday Homes Limited | Hospitality | 2025 |
| Firefly Holidays (UK) Ltd | Administrative & support | 2015 |
| Firestar Investments Limited | Professional & scientific | 2022 |
| Firetek Firing Systems UK Ltd | Wholesale & retail | 2025 |
| First Draft Analytics Limited | Professional & scientific | 2010 |
| First Point Fitness Ltd | Arts & recreation | 2022 |
| Fischer Medical Project Limited | Professional & scientific | 2008 |
| Fisherman's Wharf Residents' Association Limited | Administrative & support | 2001 |
| Fishers Restaurant (Clifton) Limited | Hospitality | 2000 |
| Fishzone Limited | Wholesale & retail | 2008 |
| Fit and Healthy Mums Ltd | Arts & recreation | 2017 |
| Fitzharris Estate Management Ltd | Real estate | 2022 |
| Fitzwin Holdings Ltd | Real estate | 2024 |
| FJF Consultancy Ltd | Professional & scientific | 2014 |
| FJS Consulting Services Ltd | Professional & scientific | 2020 |
| Flag Brothers Ltd | Construction | 2025 |
| Flamingo Logistics Ltd | Wholesale & retail | 2025 |
| Flash Broadcast Production Ltd | Professional & scientific | 2019 |
| Flat Free Tyres Limited | Manufacturing | 2006 |
| Fleet Insights Group Limited | Financial services | 2023 |
| Flemington Express Ltd | Transport & logistics | 2024 |
| Fliss Hoad Public Relations Limited | Administrative & support | 2003 |
| Floar Ltd | Other services | 2023 |
| Floreat WHL Ltd | Professional & scientific | 2023 |
| Florencenajji UK Ltd | Health & social care | 2019 |
| Flowers by Cherie Limited | Wholesale & retail | 2021 |
| Flying on Fire Limited | Information & communication | 2020 |
| Flying Squirrel Limited | Administrative & support | 2002 |
| Flyttr Holdings Limited | Professional & scientific | 2015 |
| Flyttr Limited | Agriculture & fishing | 2002 |
| FM Renovations Ltd | Construction | 2026 |
| Focus Wellness Ltd | Health & social care | 2019 |
| Folio (Shelves for Books) Limited | Other services | 1997 |
| Fone Care Limited | Wholesale & retail | 2013 |
| Football Safari Ltd | Administrative & support | 2025 |
| FOR a Limited Time Only Limited | Arts & recreation | 2018 |
| Force Analytics Limited | Wholesale & retail | 2015 |
| Ford Sidevalve Owners' Club Limited | Other services | 1991 |
| Fordsolve Ltd | Wholesale & retail | 2021 |
| Fordwat Gentlemen Limited | Arts & recreation | 2012 |
| Foregate Developments (North West) Limited | Real estate | 2004 |
| Forensics Limited | Health & social care | 2007 |
| Forge Engineering Design Solutions Ltd | Professional & scientific | 2013 |
| Formtech Composite Limited | Professional & scientific | 2008 |
| Forpos Investments Limited | Real estate | 2019 |
| Forpos Limited | Wholesale & retail | 2009 |
| Forposapps Limited | Information & communication | 2015 |
| Fortress Alarms (UK) Limited | Administrative & support | 2006 |
| FORTY3 Consulting Services Ltd | Professional & scientific | 2018 |
| Four Letters London Limited | Professional & scientific | 2021 |
| Four Seasons Dog Grooming Ltd | Other services | 2023 |
| FOX Records Limited | Arts & recreation | 2009 |
| FOX Sport Performance Ltd | Education | 2023 |
| Foxborough Limited | Households | 1988 |
| Foxborough Road Residents Association Limited | Households | 1980 |
| Foxstar Group Ltd | Education | 2026 |
| FPI Co 71 Ltd | Health & social care | 2016 |
| FPT Oxfordshire Swimming LLP | | 2018 |
| Framecore Ltd | Construction | 2026 |
| Framework Roofing, Construction & Scaffolding Ltd | Construction | 2012 |
| Frank & Nancy Ltd | Arts & recreation | 2023 |
| Frank and Louis Laundry Services Limited | Information & communication | 2024 |
| Fratelli Games Ltd | Manufacturing | 2022 |
| Freedanoise Limited | Information & communication | 2021 |
| Freehouse Pubs Limited | Hospitality | 2011 |
| Freeman Digital Ltd | Information & communication | 2013 |
| Freight Shepherd (Warehousing) Limited | Extraterritorial | 2009 |
| Frenchmans Lodge Asset Management Limited | Administrative & support | 2005 |
| Frend and Company Limited | Wholesale & retail | 1959 |
| Fresh Krepts Limited | Arts & recreation | 2015 |
| Freshnet Systems Limited | Extraterritorial | 2000 |
| Friction Productions Limited | Arts & recreation | 2019 |
| Fried Electronics Ltd | Manufacturing | 2025 |
| Frilford Development Limited | Construction | 2022 |
| Frilford Farms Limited | Agriculture & fishing | 1937 |
| Frinden Investments Ltd | Professional & scientific | 2017 |
| Frost Farms Limited | Agriculture & fishing | 1976 |
| FRS (Furniture) Ltd | Wholesale & retail | 2014 |
| Fruitway Farm Limited | Agriculture & fishing | 2024 |
| Fsbr LLP | | 2019 |
| Fudge Inns PUB Company Ltd | Hospitality | 2014 |