| Focus Vehicle Management Limited | Administrative & support | 2017 |
| Folios Limited | Wholesale & retail | 1989 |
| Follow the Magpie Ltd | Wholesale & retail | 2026 |
| Fonesmartuk Limited | Wholesale & retail | 2019 |
| FOR the Love of MUD Ltd | Extraterritorial | 2014 |
| Forces Support Limited | Wholesale & retail | 2010 |
| Ford Plumbing and Heating Ltd | Construction | 2014 |
| Foreman Roberts Consulting Limited | Professional & scientific | 2010 |
| Forensic Solutions Limited | Professional & scientific | 1999 |
| Forest IT Solutions Ltd | Information & communication | 2013 |
| Formulate Design Ltd | Professional & scientific | 2022 |
| Fornix Ltd | Professional & scientific | 2013 |
| Forrester-Hayes Property Investments Ltd | Real estate | 2015 |
| Forster Procurement Services Limited | Professional & scientific | 2014 |
| Fortis Psychology Limited | Health & social care | 2025 |
| Fortivex Ltd | Wholesale & retail | 2026 |
| Fortivity Ltd | Financial services | 2024 |
| Fortizo Cleaning Services Ltd | Administrative & support | 2022 |
| Four Flowers Ltd | Real estate | 2025 |
| Fourleys Limited | Households | 1989 |
| Fourseasons Livery Ltd | Wholesale & retail | 2013 |
| FOURT3 Construction Limited | Construction | 2019 |
| Fourthwright Design and Construction Limited | Construction | 2014 |
| FOX Close Management Company Limited | Households | 1997 |
| Foxbay Limited | Construction | 2018 |
| Foxbell Limited | Wholesale & retail | 2022 |
| Foxbury Court Management Limited | Households | 2012 |
| Foxcroft Services Limited | Professional & scientific | 2022 |
| Foxdon Limited | Construction | 1997 |
| Fractive Ltd | Information & communication | 2023 |
| Framework Scaffolding Services Limited | Construction | 2017 |
| Francis Lovel & Co Limited | Wholesale & retail | 2004 |
| Francis Lovel Gunmakers Ltd | Wholesale & retail | 2024 |
| Francis-Barnett Owners Club | Other services | 2003 |
| Fransoft Property Investment Limited | Real estate | 2022 |
| Fraser Evans & Sons Limited | Water & waste | 2002 |
| Freehold Management Administration Ltd | Real estate | 2023 |
| Freeland Engineering (Oxford) Limited | Manufacturing | 2001 |
| Freeland Nurseries Ltd | Administrative & support | 2011 |
| Freeman Architecture Ltd | Professional & scientific | 2016 |
| Fretabott (Holdings) Limited | Financial services | 2022 |
| Fretabott Advisory Limited | Professional & scientific | 2022 |
| Friday's Child Communications Ltd | Professional & scientific | 2025 |
| Fringe Hair and Beauty Limited | Administrative & support | 2002 |
| FRW Training Ltd | Arts & recreation | 2023 |
| FRY Days Fish and Chips Witney Ltd | Hospitality | 2026 |
| FSL Engineering Limited | Wholesale & retail | 2012 |
| Fswind Limited | Energy | 2010 |
| Fullstar UK Ltd | Wholesale & retail | 2021 |
| Funky Little Darlings Limited | Arts & recreation | 2006 |
| Funkydiva Jukeboxes Limited | Arts & recreation | 2017 |
| Future Carbon Capital (Holdings) Limited | Extraterritorial | 2022 |
| Future Carbon Capital Limited | Professional & scientific | 2022 |
| Future Firewood Supplies Ltd | Agriculture & fishing | 2024 |
| Future Fossils Ltd | Arts & recreation | 2026 |
| Future Power Solutions Limited | Construction | 2014 |
| Future Proof App Ltd | Health & social care | 2025 |
| Futureproof Studios Ltd | Wholesale & retail | 2025 |
| Fyrmforge Limited | Information & communication | 2026 |
| Fyson Ltd | Construction | 2008 |
| G & O Engineers (Building Services) Limited | Construction | 2003 |
| G & O Engineers Limited | Construction | 2003 |
| G and P Creative Co Ltd | Professional & scientific | 2024 |
| G Collins & Sons (Holdings) Limited | Financial services | 2022 |
| G Collins & Sons (Investments) Limited | Real estate | 2022 |
| G D Associates (Oxon) Limited | Professional & scientific | 2003 |
| G Hill & Sons Limited | Construction | 2003 |
| G MAC Electrical Ltd | Construction | 2022 |
| G S M Automotive Limited | Manufacturing | 2001 |
| G&Ss Holdings Ltd | Financial services | 2026 |
| G&Tn Cleaning Services Limited | Administrative & support | 2024 |
| G. Collins & Sons Limited | Administrative & support | 1998 |
| G.Loci Transport Limited | Manufacturing | 2021 |
| G.S. Pascoe Carpentry & Decorating Limited | Extraterritorial | 2003 |
| G.Soame Planning & Development Limited | Construction | 1991 |
| Gable Cottage Ltd | Real estate | 2023 |
| GAC Family Holdings Limited | Financial services | 2020 |
| Gadlys 8 (Investments) Limited | Administrative & support | 2014 |
| Gaff Trading Co. Ltd. | Wholesale & retail | 2006 |
| Gage Demolition Limited | Construction | 2012 |
| Gaiaveda Gardens Ltd | Administrative & support | 2023 |
| Gameup Ltd | Information & communication | 2025 |
| GAP Developments Oxford Ltd | Construction | 2018 |
| Gardias Engine Services Limited | Wholesale & retail | 2004 |
| Gardner Plumbing Limited | Construction | 2003 |
| Gary Derwent at Ltd | Professional & scientific | 2026 |
| Gate Keepers Property Services Limited | Real estate | 2003 |
| GB Auctions Limited | Financial services | 2020 |
| GB Firewood Limited | Wholesale & retail | 2025 |
| Gbkl Limited | Real estate | 2020 |
| Gdpr Sentry Limited | Information & communication | 2017 |
| Geaney Bell Ltd | Administrative & support | 2015 |
| Geldard Chappell Ltd | Administrative & support | 2025 |
| Geller Limited | Construction | 2013 |
| GEM Installations Limited | Construction | 2001 |
| GEM Residence Limited | Construction | 2021 |
| Gemma Alashe Consulting Ltd | Administrative & support | 2013 |
| Gencast Limited | Manufacturing | 2006 |
| General Church of the New Jerusalem Council Limited(The) | Other services | 1971 |
| Generation Palestine CIC | Information & communication | 2024 |