| Getinstyle Shop Ltd | Wholesale & retail | 2020 |
| Getzler Law & Equity Limited | Professional & scientific | 2019 |
| GEX Trans Ltd | Transport & logistics | 2026 |
| Ggoss Limited | Wholesale & retail | 2019 |
| Ghsrc Ltd | Professional & scientific | 2018 |
| Gifted Social Limited | Information & communication | 2024 |
| Gigafix Limited | Wholesale & retail | 2017 |
| Gigamoth Limited | Information & communication | 2012 |
| Gigastream Limited | Information & communication | 1999 |
| Giggling Goose Leisure Limited | Hospitality | 2020 |
| Gilded Words Ltd | Wholesale & retail | 2023 |
| Giles Service Centre Limited | Wholesale & retail | 2010 |
| Gilgal Healthcare Ltd | Administrative & support | 2021 |
| Gill & Co Plumbing & Heating Services Ltd | Construction | 2011 |
| Gillespies LLP | | 2003 |
| Gingell Aerospace Limited | Wholesale & retail | 2008 |
| Ginger & Spice OX Ltd | Hospitality | 2025 |
| Ginger and Palmerston Company Limited | Health & social care | 2025 |
| Ginos (Oxford) Limited | Hospitality | 2024 |
| GIO (Oxford) Limited | Wholesale & retail | 2007 |
| Girardo & Co Limited | Wholesale & retail | 2015 |
| Girardo & Co Storage Limited | Transport & logistics | 2025 |
| Girardo & Co. Private Sales Limited | Wholesale & retail | 2016 |
| Gites DE Charente Limited | Hospitality | 1995 |
| Give US a Smacker Ltd. | Professional & scientific | 1994 |
| Gjoka Construction Limited | Construction | 2026 |
| GK Oxford Limited | Hospitality | 2017 |
| Gkouri Limited | Hospitality | 2023 |
| Glad Private Care Ltd | Health & social care | 2015 |
| Gladstone Oxford Ltd | Wholesale & retail | 1950 |
| Glamour Aesthetic Limited | Other services | 2026 |
| Glamour Oxford 2 Limited | Other services | 2019 |
| Glamour Oxford Limited | Other services | 2019 |
| Glamour Westgate Limited | Other services | 2022 |
| Glat International Ltd | Education | 2024 |
| Glavmi Ltd | Wholesale & retail | 2025 |
| Gledic Residential Ltd | Real estate | 2025 |
| Glenauk Economics Limited | Professional & scientific | 2023 |
| Glide Digital Ltd | Information & communication | 2012 |
| Gliotherapy Limited | Professional & scientific | 2015 |
| Glitter Palace Limited | Arts & recreation | 2017 |
| Global AG Media UK Ltd | Information & communication | 2020 |
| Global Canopy | Professional & scientific | 2001 |
| Global Canopy Initiatives Limited | Education | 2005 |
| Global Change Data LAB | Education | 2018 |
| Global Compliance Strategies Ltd | Professional & scientific | 2018 |
| Global Construction Plant and Equipment Limited | Other services | 1992 |
| Global ED Solutions Ltd | Administrative & support | 2023 |
| Global Education and Development CIC | Professional & scientific | 2019 |
| Global Food Cash & Carry Ltd | Wholesale & retail | 2024 |
| Global Group Enterprise Limited | Real estate | 2023 |
| Global Health Policy Limited | Professional & scientific | 2022 |
| Global Initiative Limited | Information & communication | 1999 |
| Global Leadership Associates Limited | Professional & scientific | 2016 |
| Global Lexis Limited | Education | 2010 |
| Global Lions Ltd | Information & communication | 2017 |
| Global Marketing Consultants Ltd | Wholesale & retail | 2025 |
| Global Real Estate Portfolios Limited | Real estate | 2005 |
| Global Signal Exchange | Information & communication | 2021 |
| Global Sports Policy Ltd | Real estate | 2022 |
| Global Talent Associates Limited | Professional & scientific | 2013 |
| Global Technology Innovation Partnership Ltd | Administrative & support | 2014 |
| Global Thinkers Meet UP CIC | Education | 2026 |
| Global Vision Films Ltd | Information & communication | 2003 |
| Global Vision Research Ltd | Extraterritorial | 2010 |
| Global Worldwork Ltd | Financial services | 2023 |
| Global Z Consulting Ltd | Wholesale & retail | 2022 |
| Globe Newsmarket Limited | Wholesale & retail | 2019 |
| Glocom Ltd | Professional & scientific | 2010 |
| Gloria Pjean Ltd | Wholesale & retail | 2026 |
| Gloriana Fashion Limited | Wholesale & retail | 2019 |
| Gloucestershire Golf Union Limited | Arts & recreation | 2025 |
| Glow MEE Ltd | Other services | 2025 |
| Glowbar Oxford Limited | Other services | 2024 |
| Glowtec Oxford Limited | Construction | 2009 |
| Gloxhome Ltd | Real estate | 2025 |
| Glymab Therapeutics Limited | Professional & scientific | 2025 |
| GMD Estates Ltd | Construction | 2017 |
| GMD Properties (Oxford) Limited | Real estate | 2013 |
| Gmdn Agency | Health & social care | 2005 |
| Go and EAT Oxford Limited | Manufacturing | 2025 |
| Go Andrei Ltd | Transport & logistics | 2024 |
| Go Configure IT Ltd | Other services | 2018 |
| Go for IT (Respite and Social Care) Ltd | Health & social care | 2015 |
| Go for IT! (Social Care) Limited | Administrative & support | 2012 |
| Go Wild Landscapes Limited | Administrative & support | 2010 |
| Goarem Lannig Limited | Professional & scientific | 2025 |
| Goat Waste Ltd | Water & waste | 2024 |
| GOD Object Ltd | Information & communication | 2014 |
| Godolphin House (Isles of Scilly) Limited | Professional & scientific | 1964 |
| Godstow Properties Ltd | Households | 2026 |
| Golan Grill Limited | Hospitality | 2024 |
| Gold Flamingo Events Limited | Hospitality | 2019 |
| Golden CUP Ltd | Wholesale & retail | 2025 |
| Golden Heart Care Oxford Ltd | Health & social care | 2026 |
| Golden Path Technology LLP | | 2024 |
| Golden Rose Trading Ltd | Wholesale & retail | 2014 |
| Golden Sunshine Limited | Other services | 2013 |
| Golden Trio Ltd | Hospitality | 2025 |
| Goldenphoenix Export, Ltd | Wholesale & retail | 2025 |