| G M and J Properties Limited | Real estate | 2017 |
| G&B Automotors Ltd | Wholesale & retail | 2024 |
| G-Fert Ltd | Transport & logistics | 2023 |
| G-Rack Ltd | Wholesale & retail | 2025 |
| G-Tech Commercials Ltd | Wholesale & retail | 2022 |
| G. Willis Roofing Ltd | Construction | 2007 |
| G.B. Properties (North East) Limited | Real estate | 2021 |
| G.O.A.T Entertainment Ltd | Professional & scientific | 2024 |
| G2M Testing Ltd | Professional & scientific | 2001 |
| Gala Tres (Trading) Limited | Real estate | 2010 |
| Galapagos Energy Limited | Administrative & support | 2024 |
| Galaxy Vapes and Mobiles Ltd | Wholesale & retail | 2022 |
| Gale Force Pubs Ltd | Hospitality | 2023 |
| Gallagher Investments (North East) Limited | Financial services | 2021 |
| Galley & Partners Ltd. | Professional & scientific | 2021 |
| Galley & Tindle Audit Limited | Professional & scientific | 2016 |
| Galtrim Electronics Limited | Construction | 2025 |
| Gama Systems Holdings Ltd | Other services | 2024 |
| Gama Systems North East Ltd | Manufacturing | 2008 |
| Gama Systems Press Parts Ltd | Manufacturing | 2024 |
| Games Hire UK Limited | Arts & recreation | 2011 |
| Gamma Proteins Ltd | Professional & scientific | 2023 |
| Gao's Family Ltd | Hospitality | 2024 |
| Garden Vision Ltd | Construction | 2022 |
| Gareth Pearson Enterprises Ltd | Transport & logistics | 2025 |
| Gariban Enterprise Ltd | Wholesale & retail | 2025 |
| Garramor Ltd | Professional & scientific | 2021 |
| Gartech International UK Ltd | Professional & scientific | 2019 |
| Gary Cockbain Limited | Construction | 2026 |
| Gary Hogg Transport Limited | Transport & logistics | 2022 |
| Gary Pennington Couriers Ltd | Transport & logistics | 2017 |
| Gary Potts Motors Limited | Wholesale & retail | 2007 |
| GAS and Power Solutions Limited | Energy | 2021 |
| GAS Energy (North East) Ltd | Construction | 2022 |
| GAS to TAP Ltd | Construction | 2025 |
| Gastrobiz (Holdings) Limited | Health & social care | 2015 |
| Gastrocare Limited | Health & social care | 2012 |
| Gastroendoscopy Limited | Health & social care | 2013 |
| Gate Psychological Services Ltd | Health & social care | 2020 |
| Gauk Academy Limited | Wholesale & retail | 2022 |
| Gauk Limited | Wholesale & retail | 2022 |
| Gauk Properties Limited | Construction | 2023 |
| Gavin Sutherland Limited | Information & communication | 2018 |
| Gazelle Travel Newcastle Ltd | Administrative & support | 1998 |
| GB Bookkeeping & Accounting Ltd | Professional & scientific | 2018 |
| GCS Subsea Engineering Services Limited | Professional & scientific | 2007 |
| GD Autocare Ltd | Wholesale & retail | 2024 |
| GD Industrial Ltd | Real estate | 2019 |
| GE Eco Consultants Limited | Professional & scientific | 2024 |
| Gelenrose Ltd | Wholesale & retail | 2025 |
| GEM Energy - for Business Group Limited | Energy | 2018 |
| Gemica Consulting Limited | Professional & scientific | 2019 |
| Gemini Risk Management Limited | Education | 2013 |
| Gemini Roofing Limited | Construction | 2018 |
| Geniusup Store Ltd | Wholesale & retail | 2024 |
| Gentius Ltd | Wholesale & retail | 2025 |
| Genuine Way Limited | Professional & scientific | 2024 |
| GEO Plumbing & Heating Ltd | Construction | 2019 |
| Geoenergy Durham Limited | Professional & scientific | 2010 |
| Geofirma Soils Engineering Limited | Construction | 1996 |
| Geol Consulting Limited | Extraterritorial | 2024 |
| Geordiebytes Limited | Information & communication | 2026 |
| George Beattie Civil Engineering Ltd | Construction | 2015 |
| Geospatial Research Ltd | Mining & quarrying | 2004 |
| Geothermal Wells UK Limited | Energy | 2024 |
| GET Fit and Dance CIC | Health & social care | 2021 |
| GET Technology Limited | Wholesale & retail | 2022 |
| GET the Service Ltd | Professional & scientific | 2025 |
| GFR Property Ltd | Households | 2019 |
| GG Property and Homes Limited | Real estate | 2021 |
| GGH Global Ltd | Wholesale & retail | 2025 |
| GH Roofing & Sons Ltd | Construction | 2026 |
| Ghost Software Technologies Limited | Information & communication | 2025 |
| Gibside Consultancy Services Ltd | Professional & scientific | 2023 |
| Gibside Store Ltd | Wholesale & retail | 2022 |
| Gibson Residential Properties Ltd | Real estate | 2019 |
| Gibsons Sweet Escape Ltd | Wholesale & retail | 2025 |
| Gifts 365 Ltd | Wholesale & retail | 2009 |
| Gigable Ltd | Information & communication | 2020 |
| Gigabyte Games Ltd | Information & communication | 2023 |
| Gigi Property Company Ltd | Construction | 2024 |
| Gildea & Sons Property Ltd | Real estate | 2025 |
| Gilesgate Golden Chippy Ltd | Hospitality | 2019 |
| Gilesgate Ltd | Professional & scientific | 2017 |
| Gilesgate Properties Limited | Real estate | 1978 |
| Gilesgate R & M Services Ltd | Real estate | 2021 |
| Gingeroma Limited | Hospitality | 2015 |
| Gino Menta Ltd | Wholesale & retail | 2025 |
| Girlboss Properties Limited | Real estate | 2020 |
| Gironda (NE) Ltd | Hospitality | 2023 |
| Gissmos Limited | Manufacturing | 2018 |
| GJK (Durham) Limited | Hospitality | 2013 |
| GJK (Property Developments) Ltd. | Construction | 2016 |
| GK Mining and Tunnelling Services Limited | Mining & quarrying | 2025 |
| GKC Store Ltd | Wholesale & retail | 2025 |
| GL Property Renovations Ltd | Construction | 2024 |
| Glacier Property Limited | Real estate | 2021 |
| Gladiator Nutrition 4.0 Ltd | Wholesale & retail | 2016 |
| Gladys Property Connect Ltd | Real estate | 2025 |
| Glasper Tunstall Stone Masonry Limited | Mining & quarrying | 2006 |