| Eyrie Holdings Limited | Real estate | 2021 |
| F&G Dog Walking Services Ltd | Other services | 2026 |
| F.W.P. Matthews Limited | Manufacturing | 1912 |
| Fairytale Farm Limited | Arts & recreation | 2011 |
| Fairytale Holdings Limited | Professional & scientific | 2020 |
| Fairytale Holidays Limited | Hospitality | 2022 |
| False Flag Ltd | Information & communication | 2022 |
| Familiar Faces Care in the Cotswolds Limited | Health & social care | 2019 |
| Farmed CIC | Agriculture & fishing | 2020 |
| Farming Favourites Ltd | Agriculture & fishing | 2015 |
| Farmoor Service Station Limited | Real estate | 2012 |
| Fccs Arasain Ltd | Real estate | 2021 |
| FCS Management Limited | Construction | 2008 |
| Featherstone and Dalton Ltd | Real estate | 2019 |
| Feldon Builders Limited | Construction | 2013 |
| Fern Mawson Ltd | Administrative & support | 2021 |
| FH Global LLP | | 2012 |
| FH Worldwide Ltd | Information & communication | 2020 |
| Field Financial Services Limited | Professional & scientific | 2019 |
| Filum Ltd | Arts & recreation | 2025 |
| FIN Technologies Limited | Information & communication | 2017 |
| Find a Caregiver Ltd | Health & social care | 2026 |
| Findpar Limited | Households | 1981 |
| Finestock Limited | Professional & scientific | 2021 |
| Finsbury Place (Chipping Norton) Management Company Limited | Professional & scientific | 1977 |
| Firmware Solutions Limited | Information & communication | 1985 |
| First for Safety Oxfordshire Ltd | Professional & scientific | 2019 |
| First for Safety Oxon Limited | Public administration | 2026 |
| First Sight Media Limited | Professional & scientific | 2004 |
| Fjeldheim Holdings Limited | Financial services | 2025 |
| FJO Properties Ltd | Real estate | 2025 |
| Flick Quarry Limited | Extraterritorial | 2017 |
| Flight Register Limited | Information & communication | 2006 |
| Flipping Awesome Limited | Hospitality | 2024 |
| Flourish.Ed Limited | Professional & scientific | 2025 |
| Flowgiant Limited | Extraterritorial | 2006 |
| Food Tech Associates Limited | Professional & scientific | 2010 |
| Fosseway House Management Company Limited | Households | 1984 |
| Fossilised Furnishings Ltd | Manufacturing | 2018 |
| FR Govport Limited | Information & communication | 2022 |
| FR Ramps Limited | Information & communication | 2022 |
| Free Bird Poultry Limited | Agriculture & fishing | 2011 |
| Fusion Fitness Gym (Portsmouth) Limited | Arts & recreation | 2023 |
| Fusion WDT Limited | Administrative & support | 2005 |
| Future Healthcare Group Limited | Information & communication | 2023 |
| Fwpm Holdings Limited | Manufacturing | 2014 |
| G & M Auto Repairs Limited | Wholesale & retail | 2003 |
| G & M Tyack Limited | Wholesale & retail | 2015 |
| G & T Butchery Services Ltd | Manufacturing | 2024 |
| GAD R & D Limited | Professional & scientific | 2006 |
| Gadd & Company Limited | Wholesale & retail | 2006 |
| Gadgets and Gears Ltd | Wholesale & retail | 2024 |
| Gagingwell Properties Limited | Real estate | 2020 |
| Galley Order Ltd | Professional & scientific | 2023 |
| Gambit Holdings Limited | Real estate | 2021 |
| Gambit Services Limited | Professional & scientific | 2022 |
| Garden Events Limited | Administrative & support | 2006 |
| Gardn Enterprise Ltd | Administrative & support | 2024 |
| Gbpre | Other services | 2016 |
| GCH Fire and Safety Services Limited | Financial services | 2016 |
| Gdpr Systems Limited | Information & communication | 2017 |
| Geesan Limited | Wholesale & retail | 1993 |
| GEMINI4K Ltd | Professional & scientific | 2021 |
| Gemma Elizabeth Consultancy Ltd | Professional & scientific | 2025 |
| Gemma Jane Casey Limited | Professional & scientific | 2023 |
| Gemstone Aviation Limited | Transport & logistics | 2006 |
| Gfoamo Ltd | Manufacturing | 2023 |
| Giantflow Limited | Extraterritorial | 2000 |
| Gifford Investments Limited | Financial services | 2020 |
| Giraffe OUT Loud Limited | Wholesale & retail | 2024 |
| Giuseppe Catering Ltd | Wholesale & retail | 2025 |
| GJ and H Consulting Ltd | Professional & scientific | 2014 |
| Global Finance Online Limited | Financial services | 1999 |
| Global Healthcare Information Network C.I.C. | Health & social care | 2005 |
| Glyme Farm Limited | Agriculture & fishing | 1984 |
| Glyme Valley Services Ltd | Health & social care | 2023 |
| Goony Enterprises Ltd | Real estate | 2024 |
| Goosey Glass Limited | Manufacturing | 2021 |
| Goosey Glass Trading Limited | Wholesale & retail | 2021 |
| GP Systems Limited | Information & communication | 2013 |
| Graded Temp Limited | Wholesale & retail | 2021 |
| Grant Batchelor Master Thatcher Limited | Administrative & support | 2011 |
| Great Oaks Renewable Energy Park Ltd | Energy | 2022 |
| Great Rollright Rector & Wardens Ltd | Real estate | 2024 |
| Great TEW Bespoke Ltd | Construction | 2022 |
| Great TEW Construction LLP | | 2010 |
| Great TEW Grain Processing Limited | Agriculture & fishing | 2008 |
| Great TEW Properties Limited | Real estate | 2017 |
| Greek Lettings Holdings Limited | Financial services | 2025 |
| Greek Lettings Limited | Real estate | 2025 |
| Greencroft Property Management Limited | Households | 2013 |
| Greendoor Projekts Ltd | Construction | 2025 |
| Greenstake Limited | Real estate | 2002 |
| Grid Telecom Networks Ltd | Information & communication | 2011 |
| Grigny (UK) Limited | Professional & scientific | 1977 |
| Grosvenor Construction Services (Banbury) Limited | Professional & scientific | 1978 |
| Gruppo DE Simone Limited | Administrative & support | 2009 |
| Gsgm Ltd | Administrative & support | 2026 |
| Gsmsc Ltd | Professional & scientific | 2022 |
| Guiting Quarry Limited | Mining & quarrying | 2019 |