| Fixzone (UK) Limited | Extraterritorial | 2020 |
| FJF Training Services Ltd | Professional & scientific | 2022 |
| Fletcher Gamble Properties Limited | Real estate | 2020 |
| Fletcher-Gamble Limited | Wholesale & retail | 2011 |
| FLO Motorcycles Limited | Wholesale & retail | 2025 |
| Foamworx Ltd | Administrative & support | 2026 |
| Focus Joinery Limited | Construction | 2017 |
| Food Paradise HLS Ltd | Hospitality | 2024 |
| Foot Fairy Ltd | Health & social care | 2025 |
| Forb Media Ltd | Manufacturing | 2017 |
| Forefront Logic Ltd | Information & communication | 2025 |
| Forest Development NE Ltd | Construction | 2024 |
| Forever Roofing Limited | Construction | 2020 |
| Forgenorth Consulting Ltd | Information & communication | 2026 |
| Form 4 Limited | Professional & scientific | 2003 |
| Form and Fit Ltd | Manufacturing | 2026 |
| Forming Essentials Ltd | Professional & scientific | 2021 |
| Fourforty General Haulage Ltd | Transport & logistics | 2023 |
| Frame Team Ltd. | Construction | 2013 |
| Framwellgate Fishpan Limited | Hospitality | 2019 |
| Francesca Ltd | Hospitality | 2019 |
| Francis Brown Limited | Manufacturing | 1947 |
| Frank Jones (Chemist) Limited | Health & social care | 1941 |
| Freedom Inc Ltd | Professional & scientific | 2022 |
| Frenched Press Ltd | Information & communication | 2017 |
| Fresh Heart Limited | Information & communication | 2010 |
| Fresh Start Events Ltd | Information & communication | 2018 |
| Friendz Enterprises Ltd | Wholesale & retail | 2025 |
| From the Terraces Limited | Wholesale & retail | 2019 |
| Front Street Inn Limited | Hospitality | 2024 |
| FTA Limited | Professional & scientific | 2023 |
| Fulton Property Ltd | Real estate | 2023 |
| G & J Wood Machinery Limited | Administrative & support | 2007 |
| G C Solutions (NE) Ltd | Construction | 2020 |
| G Cooper Consulting Limited | Professional & scientific | 2021 |
| G K & M Limited | Other services | 2009 |
| G S Brennan Inspection Services Ltd | Administrative & support | 2017 |
| G Turnbull Limited | Manufacturing | 1955 |
| G. Appleby Limited | Transport & logistics | 2011 |
| GAC Property Investments Limited | Real estate | 2025 |
| Gaines and Kerry Properties Limited | Real estate | 2004 |
| Galaxeous ICT Solutions Limited | Information & communication | 2025 |
| Gallaghers GAS Limited | Manufacturing | 2015 |
| Garden Tidy Ltd | Administrative & support | 2026 |
| Garrett Contractors Ltd | Construction | 2022 |
| Gary Bennett (Sports & Media) Limited | Manufacturing | 2005 |
| Gate Burton Energy Park Limited | Energy | 2020 |
| Gateway Wheelers | Health & social care | 2019 |
| Gbboutique Ltd | Other services | 2019 |
| Geek Talent Limited | Information & communication | 2014 |
| Gelatissimo Limited | Manufacturing | 2022 |
| GENER8 Energy Plus Limited | Administrative & support | 2022 |
| Genrov Ltd | Professional & scientific | 2009 |
| GEO Omni Delivery Services Ltd | Transport & logistics | 2026 |
| GF Productions Limited | Arts & recreation | 2018 |
| GHJ Services Ltd | Construction | 2025 |
| Gingerbird Ltd | Real estate | 2026 |
| GJ Heat Ltd | Construction | 2023 |
| GJ Home Improvements Ltd | Construction | 2024 |
| Glass Balustrades Northern Limited | Manufacturing | 2020 |
| Glass Moor II Windfarm Limited | Energy | 2003 |
| Gleam Housekeeping Service Ltd | Administrative & support | 2013 |
| Glis Express Ltd | Transport & logistics | 2017 |
| Global Access Consultants Ltd | Construction | 2023 |
| Glow Merchandise Ltd | Wholesale & retail | 2025 |
| GMH Groundworks Ltd | Construction | 2025 |
| Go Beyond Limits Ltd | Administrative & support | 2017 |
| Go FIX Northern Limited | Construction | 2012 |
| Gofer A.G.V.'s Ltd. | Manufacturing | 1996 |
| Gogou Pets Ltd | Wholesale & retail | 2026 |
| Golden Falcon NE Ltd | Real estate | 2025 |
| Golden FRY Fencehouses Limited | Hospitality | 2018 |
| Goodini Limited | Hospitality | 2019 |
| Gordon Plumbing Services Limited | Construction | 2003 |
| Gosife Aerospace Ltd | Manufacturing | 2025 |
| GPL Contracts Ltd | Construction | 2011 |
| Graceful INK Ltd | Arts & recreation | 2018 |
| Grassroots Games Ltd | Information & communication | 2025 |
| Green Rigg Windfarm Limited | Energy | 2011 |
| Greenbank Property Solutions Ltd | Real estate | 2018 |
| Greenstone Groundworks Ltd | Construction | 2025 |
| Greykai Ltd | Real estate | 2025 |
| Griffiths Waste Removals Ltd | Water & waste | 2024 |
| Grimlord Games Limited | Manufacturing | 2014 |
| Grindon Gymnastics Club Community Interest Company | Arts & recreation | 2019 |
| Grinformation Ltd | Information & communication | 2024 |
| Grizedale Observatory Education C.I.C. | Education | 2025 |
| Grow Hard OR Grow Home Ltd | Wholesale & retail | 2025 |
| GSB Roofing (NE) Limited | Construction | 2021 |
| GT Retail Ltd | Hospitality | 2026 |
| GT Waste Disposal Ltd | Water & waste | 2026 |
| GTK Engineering (NE) Limited | Professional & scientific | 2019 |
| GW Changes CIC | Health & social care | 2022 |
| GWR BIN Rentals Ltd | Water & waste | 2026 |
| Gwynt Glas Offshore Wind Farm Limited | Energy | 2021 |
| H&M Electrical Lighting and Power Ltd | Construction | 2021 |
| H. S. Scaffolding (North East) Limited | Construction | 2011 |
| H.G Security Solutions UK Ltd | Administrative & support | 2024 |
| H.T.B. Electrical Contractors Limited | Construction | 2004 |
| Hair Connection (Houghton-Le-Spring) Ltd | Other services | 2022 |