| Goldwire Solutions Ltd | Information & communication | 2021 |
| Golem Commerce Limited | Wholesale & retail | 2024 |
| Golf Buggy Services Limited | Manufacturing | 2008 |
| Gone for a Burton Ltd | Hospitality | 2018 |
| Good Consideration LLP | | 2001 |
| Good Food Oxfordshire Ltd | Hospitality | 2017 |
| Good Hope Carers Ltd. | Other services | 2016 |
| Good News to the World Ministries Limited | Information & communication | 2010 |
| Good Projects Limited | Professional & scientific | 2025 |
| Good PUB Food Ltd | Hospitality | 2025 |
| Good Vibes Technologies Ltd | Information & communication | 2023 |
| Good Wallet Ltd | Information & communication | 2026 |
| Goodfellow Publishers Limited | Information & communication | 2008 |
| Goodies Oxford Ltd | Wholesale & retail | 2024 |
| Gordian Pharma Limited | Professional & scientific | 2020 |
| Gorman Surfacing Limited | Construction | 2020 |
| Gosford Builders Limited | Construction | 2003 |
| Gosford Engineering Ltd | Construction | 2019 |
| Gosouk Ltd | Wholesale & retail | 2025 |
| Goswell Vantage Limited | Extraterritorial | 2007 |
| Goswiftcorp Ltd | Administrative & support | 2023 |
| Gotemhere Ltd | Wholesale & retail | 2024 |
| Govericks Limited | Professional & scientific | 2016 |
| Gowrings (Abingdon) Limited | Real estate | 1966 |
| Grace Jennings Ltd | Health & social care | 2024 |
| Grade Design Consultants Limited | Professional & scientific | 2003 |
| Graeme Freeman Associates Limited | Professional & scientific | 2010 |
| Graeme Ogilvie Consultancy Limited | Professional & scientific | 2008 |
| Granary Delicatessen Ltd | Wholesale & retail | 2019 |
| Grand CRU Oxford Limited | Hospitality | 2024 |
| Grand Gyms Ltd | Arts & recreation | 2019 |
| Grand River Productions Ltd | Information & communication | 2018 |
| Grand Towers Ltd | Professional & scientific | 2012 |
| Grandpont Limited | Information & communication | 2007 |
| Grange Mill (Holdings) Limited | Construction | 2017 |
| Grange Mill Developments Limited | Construction | 2000 |
| Granta Laboratories Limited | Professional & scientific | 2012 |
| Granza BIO Limited | Administrative & support | 2024 |
| Graphicwraps Limited | Extraterritorial | 2014 |
| Grass & Brix Ltd | Real estate | 2026 |
| Grassgarth (Management) Limited | Professional & scientific | 2003 |
| Grasshopper Independent Ltd | Administrative & support | 2024 |
| Grasshopper Property Group Limited | Real estate | 2025 |
| Grassp Ltd | Education | 2023 |
| Gravegood Production Ltd | Information & communication | 2023 |
| Gravel Rock Groundworks Limited | Construction | 2018 |
| Gravel Rock Limited | Construction | 2017 |
| Gravita Audit Oxford LLP | | 2017 |
| Gravita Oxford LLP | | 2010 |
| Gravity Underwriting Limited | Financial services | 2008 |
| Gray Baynes & Shew LLP | | 2006 |
| Gray Page Intelligence Services Limited | Information & communication | 2003 |
| Gray Page Limited | Professional & scientific | 2003 |
| Gray Page Marine Systems Limited | Professional & scientific | 2003 |
| Grayburn Carpentry Limited | Construction | 2018 |
| GRE Capital Ltd | Real estate | 2007 |
| GRE Growth Limited | Financial services | 2023 |
| GRE Land Limited | Real estate | 2008 |
| Great Asia 43 Limited | Hospitality | 2026 |
| Great British Escapes Limited | Administrative & support | 2013 |
| Great Food Oxford Ltd | Hospitality | 2026 |
| Great Oak Landscaping Ltd | Administrative & support | 2025 |
| Green & Grey Associates Ltd | Information & communication | 2026 |
| Green Bandit Limited | Construction | 2006 |
| Green Bike Food Company Ltd | Hospitality | 2020 |
| Green Cafes Limited | Hospitality | 2009 |
| Green Cars Oxford Ltd | Transport & logistics | 2025 |
| Green Debt Advisory Limited | Professional & scientific | 2026 |
| Green Gold Group Ltd | Professional & scientific | 2025 |
| Green Hygge Engineering Ltd | Professional & scientific | 2019 |
| Green Investment Company One Limited | Administrative & support | 2021 |
| Green Junk Hub Limited | Water & waste | 2025 |
| Green Order Limited | Hospitality | 2021 |
| Green Planet Architecture Ltd | Professional & scientific | 2023 |
| Green Pomegranate Ltd | Manufacturing | 2017 |
| Green Ridges Freehold Limited | Households | 2013 |
| Green Templeton Services Ltd. | Administrative & support | 2005 |
| Green Valley AK Ltd | Wholesale & retail | 2023 |
| Greencities Consulting Ltd | Professional & scientific | 2026 |
| Greene's Educational Services Limited | Education | 2013 |
| Greene's Tutorial Education Limited | Education | 2020 |
| Greenhithe London Limited | Real estate | 2017 |
| Greenhouse Ministries Limited | Other services | 2006 |
| Greenings (Oxford) Limited | Real estate | 1930 |
| Greenings (Retail) Limited | Real estate | 2013 |
| Greenings Limited | Professional & scientific | 2008 |
| Greenleaf (Land & Build) Limited | Administrative & support | 2022 |
| Greenlight the Globe Limited | Arts & recreation | 2018 |
| Greenpole Investments Limited | Real estate | 2018 |
| Greenridges Management Company (Merewood) Limited | Households | 1994 |
| Greenridges Management Company Limited | Households | 1990 |
| Greens Funeral Services Ltd | Other services | 2015 |
| Greens Steel Frame Buildings Limited | Construction | 1982 |
| Greenselfie Ltd | Real estate | 2021 |
| Greensteer Ltd | Professional & scientific | 2024 |
| Greenstone Properties Limited | Construction | 2000 |
| Greenway Holdings (Narberth) Limited | Real estate | 2001 |
| Greenwoods of Garsington Limited | Wholesale & retail | 2013 |
| Gregory Homes Limited | Construction | 2013 |
| Gregory Homes Properties Ltd | Real estate | 2020 |