| Future Energy NE Ltd | Construction | 2023 |
| Future Forged Ltd. | Wholesale & retail | 2023 |
| Future Talent Management Agency Limited | Arts & recreation | 2014 |
| Futurenova Limited | Manufacturing | 2013 |
| Fuze Electrical Solutions Limited | Construction | 2019 |
| FWM Electrical Ltd | Construction | 2023 |
| G & a Robson Properties Ltd | Households | 2019 |
| G & T Robson Ltd | Manufacturing | 2006 |
| G a Mackenzie Ltd | Construction | 2011 |
| G a Sports Management Limited | Arts & recreation | 2010 |
| G Adams Trading Ltd | Wholesale & retail | 2016 |
| G Collier Access Limited | Transport & logistics | 2011 |
| G D Services (N.E.) Limited | Construction | 2017 |
| G Elliott Couriers Ltd | Transport & logistics | 2016 |
| G PEV Properties Limited | Real estate | 2025 |
| G Turnbull & SON Limited | Agriculture & fishing | 2011 |
| G&D Brickwork Ltd | Construction | 2017 |
| G&D Transport Ltd | Transport & logistics | 2021 |
| G&D Ward Property Ltd | Real estate | 2026 |
| G&G101 Ltd | Transport & logistics | 2025 |
| G&K Build Ltd | Construction | 2025 |
| G&T Roofing Limited | Construction | 2026 |
| G-Force Rooflines & Property Maintenance Ltd | Construction | 2021 |
| G.Prudhoe & Company Limited | Manufacturing | 1938 |
| G.Wake SMS Ltd | Professional & scientific | 2024 |
| G2 (Redcar) Management Company Limited | Households | 2007 |
| GA Oliver Limited | Construction | 2003 |
| Gabalis Ltd | Transport & logistics | 2020 |
| Gabl Hospitality Limited | Hospitality | 2025 |
| Gaia Uplift Ltd | Wholesale & retail | 2023 |
| Gainford Consulting Limited | Information & communication | 2016 |
| Gainford Housing Ltd | Professional & scientific | 2011 |
| Gainford Riverside Millennium Green Limited | Arts & recreation | 2009 |
| Galaxy Vape Ltd | Information & communication | 2013 |
| Galecki Property Ltd | Real estate | 2025 |
| Gallerina Limited | Arts & recreation | 2004 |
| Gamecore Ltd | Wholesale & retail | 2025 |
| Gamesley Ltd | Administrative & support | 2023 |
| Gange Beauty Ltd | Other services | 2025 |
| Garden Court (Darlington) Residents' Association Limited | Households | 1998 |
| Gardyen Ltd | Wholesale & retail | 2025 |
| Gargetts Ltd | Wholesale & retail | 2025 |
| Gary Hughes Investments Unlimited | Financial services | 2020 |
| Gary Lowe Chef Ltd | Hospitality | 2025 |
| GAS Services Industrial Limited | Construction | 2011 |
| GAS Universe Ltd | Construction | 2019 |
| Gasgo Plumbing & Heating Ltd | Construction | 2010 |
| Gaskillapex Ltd | Construction | 2025 |
| Gasomatic Ltd | Construction | 2018 |
| Gathering Point Games Limited | Wholesale & retail | 2021 |
| Gavin Watson Plumbing & Heating Ltd | Construction | 2017 |
| GB Heating Design Ltd | Construction | 2018 |
| GB Trading Limited | Real estate | 2015 |
| GBL Consultants Limited | Professional & scientific | 2017 |
| Gbmw Ltd | Professional & scientific | 2017 |
| GC Commercial Services Ltd | Professional & scientific | 2023 |
| GCB Road Freight Ltd | Transport & logistics | 2016 |
| GCR Construction Limited | Manufacturing | 2015 |
| GD Cable Consulting Limited | Professional & scientific | 2025 |
| Gdcc Limited | Administrative & support | 2013 |
| GDL Access Limited | Construction | 2019 |
| Gdmss Ltd | Professional & scientific | 2017 |
| GDS Project Services Ltd | Professional & scientific | 2024 |
| Gear Guardians Ltd | Other services | 2025 |
| Gecadis One Management Limited | Administrative & support | 2019 |
| Gecho Ultrasound Solutions Ltd | Health & social care | 2016 |
| Gecko Digital Global Limited | Professional & scientific | 2019 |
| Gecomac Limited | Manufacturing | 2010 |
| Geddes Construction Ltd | Administrative & support | 2024 |
| Geddes Plant Hire Ltd | Administrative & support | 2024 |
| Gehrmann Engineering Services Ltd | Wholesale & retail | 2025 |
| GEM Horseboxes Limited | Wholesale & retail | 2016 |
| GEM Properties Draycot Limited | Households | 2020 |
| Gen-Rent UK Ltd | Energy | 2019 |
| Genesis HOMES13 Limited | Households | 2025 |
| Genh Ltd | Real estate | 2025 |
| Genisus Ltd | Professional & scientific | 2020 |
| Gentix Ltd | Information & communication | 2001 |
| GEO Bloc Ltd | Manufacturing | 2019 |
| Geoffrey Gillow Ltd | Wholesale & retail | 2013 |
| George Allinson (Transport) Limited | Wholesale & retail | 1969 |
| George and Dragon 25 Ltd | Hospitality | 2025 |
| George Davidson Limited | Construction | 2024 |
| George Trans ALF Limited | Transport & logistics | 2022 |
| Gereli Ltd | Transport & logistics | 2019 |
| GF Park Homes Ltd | Construction | 2024 |
| GGB Projects Ltd | Real estate | 2013 |
| Ghag Properties Ltd | Real estate | 2020 |
| GI Gi's Leisure Ltd | Arts & recreation | 2021 |
| GIG (Bishop) Limited | Hospitality | 2024 |
| Ginger Flame Limited | Real estate | 2007 |
| Gingerjar (Couture) Ltd | Extraterritorial | 2012 |
| Gingerwick Limited | Wholesale & retail | 2023 |
| Girl Power Rocks Limited | Other services | 2022 |
| GIS Innovation Ltd | Professional & scientific | 2012 |
| GJJ Developments Ltd | Construction | 2026 |
| GKV NE Ltd | Hospitality | 2024 |
| GL Surveys Limited | Construction | 2014 |
| Gladstone Convenience Stores Ltd | Wholesale & retail | 2010 |
| Gladys Beauty Salons Limited | Other services | 2016 |