| First FIX Joinery Limited | Construction | 2017 |
| First on Scene North East Ltd | Health & social care | 2025 |
| Fitz-Coatings Limited | Professional & scientific | 1999 |
| Five Star Hand Car Wash (Jarrow) Ltd | Other services | 2019 |
| Fleet Vehicle Holdings Ltd | Financial services | 2025 |
| Fleet Vehicle Solutions Ltd | Wholesale & retail | 2022 |
| FLH (Jarrow) Limited | Financial services | 2024 |
| Flickering Myth Limited | Information & communication | 2015 |
| Flooring @ Holding Ltd | Extraterritorial | 2022 |
| Flowery Bloom Ltd | Wholesale & retail | 2026 |
| Food & Meat Connection Limited | Manufacturing | 2024 |
| FOR ALL Your Occasions Limited | Professional & scientific | 2024 |
| Forresters Properties Limited | Real estate | 2023 |
| Fort Access Ltd | Construction | 2024 |
| Fortress Electrical Services Limited | Construction | 2021 |
| Franchi Properties Ltd | Real estate | 2019 |
| Freemans Quay Management Company Limited | Households | 2005 |
| Frontline Nutrition Ltd | Wholesale & retail | 2025 |
| Frostworks Cleaning Limited | Administrative & support | 2024 |
| Frostworks DRY Ice Blasting Ltd | Administrative & support | 2026 |
| Fulcrum Recruitment Limited | Administrative & support | 2024 |
| Function Room Hire Ltd | Hospitality | 2015 |
| Funky Chunky Furniture Ltd | Manufacturing | 2013 |
| Funnels Kingdom Ltd | Wholesale & retail | 2024 |
| FW Packaging (Northern) Limited | Wholesale & retail | 2004 |
| G B OIL & GAS Services Limited | Construction | 2018 |
| Gableco Ltd | Manufacturing | 2024 |
| Gauci’S Ltd | Other services | 2025 |
| Gcne Limited | Construction | 2025 |
| Geoffrey Forrester & Co Limited | Professional & scientific | 2012 |
| Getfitacademy Ltd | Other services | 2011 |
| GHI Computers Limited | Information & communication | 2013 |
| GHI Property Holdings Limited | Real estate | 2022 |
| Giulio Franchi Ltd | Real estate | 2012 |
| GLB Builders Limited | Construction | 2015 |
| Glenmore Operations Ltd | Real estate | 2026 |
| Glenmore Tower House Ltd | Financial services | 2026 |
| GLJ Electrical Services Limited | Professional & scientific | 2024 |
| Global Strategic Planning Ltd | Administrative & support | 2012 |
| GMC Rescue Ltd | Professional & scientific | 2025 |
| GN Brickwork North East Ltd | Construction | 2024 |
| Goodman Transport Services Ltd | Transport & logistics | 2024 |
| Gordon Square Services Limited | Administrative & support | 1959 |
| Grapevine Financial Services Limited | Other services | 2010 |
| Great North Accountants UK Limited | Professional & scientific | 2025 |
| Great North Convenience Stores Limited | Wholesale & retail | 2025 |
| Green GAS Energy Ltd | Construction | 2021 |
| Griffin Electrical Group Limited | Energy | 2024 |
| Gsce Holdings Ltd | Real estate | 2018 |
| H C C Consultancy Ltd | Professional & scientific | 2021 |
| Hadrian 55 Limited | Extraterritorial | 2013 |
| Hair at Ellison Limited | Other services | 2023 |
| Hair by Ashton Ltd | Other services | 2025 |
| Hamilton Facilities Management Services Ltd | Transport & logistics | 2012 |
| Hamilton Properties NE Ltd | Real estate | 2021 |
| Harrison Mechanical and Electrical Limited | Construction | 2021 |
| Hastings Hill Sunderland Ltd | Hospitality | 2022 |
| Hawkridge Holdings Limited | Manufacturing | 2021 |
| Hawkridge Management Limited | Manufacturing | 2013 |
| Hawkswood Lodges Ltd | Hospitality | 2022 |
| Hebson Properties Ltd | Real estate | 2015 |
| Hedworthfield Community Hub Limited | Hospitality | 2017 |
| Hendriksen Industrial Flooring Limited | Construction | 1998 |
| HG Industrial Ltd | Construction | 2026 |
| Hillside Filling Station Limited | Wholesale & retail | 2008 |
| HMF Gynae Limited | Health & social care | 2025 |
| Hodgsons Butchers Limited | Wholesale & retail | 2025 |
| Holly Wealth Protection Limited | Financial services | 2012 |
| Holmes Hospitality Ltd | Hospitality | 2025 |
| Home Delivery Group Ltd | Transport & logistics | 2025 |
| Homely Real Estate Limited | Real estate | 2020 |
| House of Savannah Limited | Other services | 2025 |
| Htodd Ltd | Health & social care | 2018 |
| Hughes Hospitality Ltd | Hospitality | 2023 |
| HVR Pentagon Limited | Manufacturing | 1973 |
| I & a Property Investments Ltd | Real estate | 2020 |
| I Stonehouse Ltd | Manufacturing | 2026 |
| I&A Commercial Properties Ltd | Real estate | 2024 |
| IAN Cruickshank & Co. Limited | Professional & scientific | 2010 |
| IAN Shepherd Consultancy Limited | Professional & scientific | 2024 |
| IAN West Photo Ltd | Arts & recreation | 2019 |
| Iconitech Limited | Wholesale & retail | 2017 |
| Idleson Limited | Real estate | 2014 |
| IE Property Limited | Households | 2024 |
| IFA Inspection & Access Ltd | Professional & scientific | 2023 |
| IFA Properties (NE) Ltd | Real estate | 2025 |
| Impack Apparel Ltd | Wholesale & retail | 2013 |
| IN House Design (NE) Ltd | Administrative & support | 2016 |
| Inba Housing Ltd | Real estate | 2025 |
| Indemandsale Ltd | Wholesale & retail | 2023 |
| Infinite Roofing and Building Limited | Construction | 2025 |
| Inline Heating and Plumbing NE Ltd | Construction | 2025 |
| Inova Leisure Ltd | Manufacturing | 2022 |
| Inpipe Technical Limited | Mining & quarrying | 2007 |
| Intelligent Commercial Finance Limited | Financial services | 2009 |
| Intelligent Dental Solutions Laboratory Limited | Health & social care | 2011 |
| Intertank Cleaning Services Limited | Other services | 1988 |
| Intertank Holdings Limited | Financial services | 2024 |
| Intolerancelab Limited | Health & social care | 2017 |
| Italica Evolve Property Services Ltd | Construction | 2026 |