| Gilliattconstruction Ltd | Construction | 2026 |
| Gillies Fabrics Limited | Extraterritorial | 2014 |
| Gillivervet Limited | Extraterritorial | 2002 |
| Gillygate Guest House Ltd | Hospitality | 2019 |
| Gillygate Management Company Limited | Households | 1995 |
| Gillygate York Property Management Limited | Households | 2018 |
| Gilmoor Vets Limited | Extraterritorial | 2010 |
| Gilsted Properties Ltd | Real estate | 2026 |
| Gilt Bakehouse Limited | Hospitality | 2026 |
| Gilted Investments Limited | Construction | 1960 |
| Gimlet Associates Limited | Professional & scientific | 2014 |
| Gina York Ltd | Hospitality | 2024 |
| Ginaluca Ltd | Hospitality | 2025 |
| Ginger Bear (Helmsley) LLP | | 2021 |
| Ginger Taverns Limited | Extraterritorial | 2001 |
| Gingernut Monkey Limited | Hospitality | 2012 |
| Ginos Ltd | Hospitality | 2018 |
| Gipping Mill (Great Blakenham) Residents Management Company Limited | Households | 2019 |
| Giraffe Logistics Limited | Transport & logistics | 2006 |
| Girandole London Limited | Extraterritorial | 2025 |
| Giungla Amore Limited | Wholesale & retail | 2019 |
| Give the Dog a Bone (York) Limited | Wholesale & retail | 2017 |
| GIVE2GETS Project Planning Services Ltd | Professional & scientific | 2022 |
| GJ Orthodontics Limited | Health & social care | 2025 |
| GJB Kitchens Ltd | Construction | 2019 |
| GJR Property Services Limited | Administrative & support | 2017 |
| GKB Audio Ltd | Information & communication | 2026 |
| GL02 Limited | Construction | 2020 |
| GL03 Limited | Construction | 2020 |
| GL05 Limited | Construction | 2022 |
| Gladene Limited | Financial services | 2026 |
| Gladstone (Yorkshire) Properties Ltd | Real estate | 2023 |
| Gladstone Tyre & Autocare Ltd | Wholesale & retail | 2023 |
| Gladstone Tyre & Battery Co (York) Limited | Real estate | 1951 |
| Glaisby Court Management Company Limited | Real estate | 2004 |
| Glam Living Limited | Construction | 2019 |
| Glamford Building Company Limited | Extraterritorial | 1957 |
| Glamour Estetica Limited | Wholesale & retail | 2022 |
| Glan YR Afon (Swansea) Management Company Limited | Households | 2015 |
| Glass Wall Industries Ltd | Hospitality | 2024 |
| Glassbrook Imports Ltd | Manufacturing | 2016 |
| Glasshouse Farm Limited | Agriculture & fishing | 1986 |
| Glasshouse York Ltd | Hospitality | 2024 |
| Glassplant Services Limited | Manufacturing | 2006 |
| Glasswing Consulting Ltd | Professional & scientific | 2019 |
| Glastonfurry Ltd | Professional & scientific | 2024 |
| GLC Properties Limited | Real estate | 2018 |
| Glebe Properties Limited | Construction | 1995 |
| Gledhill Homes York Limited | Construction | 2012 |
| Glencairn Finance Limited | Financial services | 2014 |
| Glencairn Properties Limited | Real estate | 2014 |
| Glencor Golf Holidays Limited | Administrative & support | 2012 |
| Glencross Case Management Limited | Health & social care | 2015 |
| Glendale Praetorian Limited | Financial services | 2017 |
| Glenn Coaches Limited | Professional & scientific | 2010 |
| Glensbury Property Limited | Real estate | 2020 |
| Glew Enterprises Limited | Energy | 2013 |
| GLF Ltd | Other services | 2025 |
| Gliterary Lunches Limited | Arts & recreation | 2018 |
| Gliwa Limited | Information & communication | 2015 |
| GLK Solutions Ltd | Professional & scientific | 2010 |
| Gllu Ltd | Transport & logistics | 2026 |
| GLO Clean (York) Limited | Administrative & support | 2025 |
| Global Church Ltd. | Other services | 2011 |
| Global Company Formation Limited | Administrative & support | 2006 |
| Global Direct Consultancy Ltd | Professional & scientific | 2014 |
| Global Fabrication Ltd | Manufacturing | 2017 |
| Global Goals Education CIC | Education | 2026 |
| Global Insulation Limited | Wholesale & retail | 2015 |
| Global Investments Online Ltd. | Wholesale & retail | 2013 |
| Global Offset Limited | Professional & scientific | 2024 |
| Global Paper Sales Limited | Wholesale & retail | 2024 |
| Global Power Resource Limited | Professional & scientific | 2017 |
| Global Unistudy Consultancy Limited | Professional & scientific | 2022 |
| Globalgradsolutions Ltd | Information & communication | 2025 |
| Globalridge Limited | Real estate | 2014 |
| Gloe Ltd | Arts & recreation | 2025 |
| Glory International Resources Ltd | Mining & quarrying | 2011 |
| Glory Petroleum UK Limited | Mining & quarrying | 2019 |
| Gloss Creative Recruitment LLP | | 2016 |
| Glossa Limited | Health & social care | 2012 |
| Glover Training (York) Limited | Real estate | 2007 |
| Glovers Plumbers Ltd | Construction | 2026 |
| Glow Fibre Networks Ltd | Information & communication | 2026 |
| Glowbuzzer Ltd | Information & communication | 2016 |
| Gluma Ltd | Health & social care | 2020 |
| Glwd Property Ltd | Households | 2024 |
| Glyn Morrell Electrical Services Limited | Construction | 2024 |
| GM Feeley Consultancy Limited | Extraterritorial | 2011 |
| GM Management Systems Consultancy Limited | Professional & scientific | 2017 |
| GM Soft-Tek Limited | Information & communication | 1996 |
| Gmaj Consulting Limited | Professional & scientific | 2013 |
| Gmaj Holdings Ltd | Professional & scientific | 2024 |
| Gmalinga Limited | Public administration | 2018 |
| GMG Health Limited | Health & social care | 2016 |
| Gmkd Holdings Ltd | Wholesale & retail | 2023 |
| GML Group Limited | Extraterritorial | 1992 |
| GMY Structural Detailing Services Limited | Professional & scientific | 2017 |
| GN Photonics Ltd | Professional & scientific | 2024 |
| Gnashers Oral Care Ltd | Health & social care | 2023 |