| GPS Installations Ltd | Construction | 2008 |
| Graeme Barker Company Limited | Construction | 2009 |
| Graeme Mitcheson Stone Carving Limited | Construction | 2025 |
| Graham Hill Building Surveyor Limited | Professional & scientific | 2015 |
| Grahame Mcgill Limited | Construction | 2012 |
| Gravity Heating Ltd | Construction | 2022 |
| Grays Management Rentals Ltd | Administrative & support | 2024 |
| Greener Lawns Ltd | Administrative & support | 2022 |
| Group Jester Security Ltd | Administrative & support | 2025 |
| GS Retail Limited | Wholesale & retail | 2023 |
| GTS Autoparts Ltd | Wholesale & retail | 2023 |
| GTS Auto Repairs Limited | Wholesale & retail | 2025 |
| Gulmen Ltd | Hospitality | 2019 |
| Gust Independent School Ltd | Education | 2004 |
| Haghkar Offshore Limited | Mining & quarrying | 2014 |
| HAH North East Ltd | Real estate | 2019 |
| Happy MAN Holdings Ltd | Real estate | 2023 |
| Happy Wall Limited | Manufacturing | 2025 |
| Harrison Property (NE) Ltd | Real estate | 2020 |
| Hart Asset Ltd | Construction | 2024 |
| Harvey Brewis Services Ltd | Construction | 2025 |
| Hawthorne Electrics Limited | Construction | 2016 |
| Heads Earthmoving Limited | Administrative & support | 2007 |
| Health NE Limited | Wholesale & retail | 2026 |
| Healthy Happy Places Limited | Health & social care | 2025 |
| Hector Accountancy Ltd | Professional & scientific | 2020 |
| Hemera Holidays Franchise Limited | Hospitality | 2017 |
| Hermes Consulting Ltd | Information & communication | 2019 |
| Herron Property Ltd | Real estate | 2023 |
| Hi-Quality Limited | Wholesale & retail | 2023 |
| Higgins Bookmakers Limited | Arts & recreation | 1983 |
| High Climber Limited | Construction | 2025 |
| High PIT Fish & Grill Ltd | Wholesale & retail | 2022 |
| Highfield House Consett Limited | Construction | 2025 |
| Hirst Welfare Centre Ltd | Health & social care | 2024 |
| HOG Roast Deli Ltd | Wholesale & retail | 2022 |
| Holiday Lets NE Ltd | Hospitality | 2020 |
| Hollie & Lauren Townsley Property Limited | Financial services | 2020 |
| Hollow Investments Ltd | Real estate | 2021 |
| Home IS Where the Help IS Ltd | Health & social care | 2017 |
| Homes for Rent North Ltd | Real estate | 2019 |
| Hopkin Group Ltd | Professional & scientific | 2026 |
| Horizon Estates (Ferryhill) Ltd | Real estate | 2017 |
| House of Frame Ltd | Wholesale & retail | 2024 |
| Howpark Lettings Ltd | Real estate | 2025 |
| HPH Renewables Ltd | Construction | 2025 |
| Hudsmechanicalservices Limited | Professional & scientific | 2025 |
| Human Reset Consultants Ltd | Administrative & support | 2025 |
| I D Construction and Joinery Limited | Construction | 2011 |
| I N E R T I a Health Care Limited | Health & social care | 2004 |
| I&M Azam Ltd | Wholesale & retail | 2024 |
| I-Glo Limited | Administrative & support | 2017 |
| IAN Rutherford Surveying Ltd | Professional & scientific | 2023 |
| IDM Landscaping Limited | Administrative & support | 2007 |
| Idunn Aesthetics Ltd | Other services | 2023 |
| Impact Change Solutions Limited | Professional & scientific | 2005 |
| Impacted Grace Ltd | Wholesale & retail | 2026 |
| INFIN8 Developments Limited | Construction | 2019 |
| Infinite Estates Ltd | Real estate | 2018 |
| Informative IT Solutions Limited | Information & communication | 2014 |
| Innova North Ltd | Construction | 2024 |
| Innovative Sales Strategies Ltd | Professional & scientific | 2026 |
| Innovision Global Limited | Manufacturing | 2025 |
| Innovision Global Solutions Limited | Manufacturing | 2022 |
| Inspection, Testing & Maintenance Engineering Ltd | Professional & scientific | 2003 |
| Inspired Product Design Ltd | Manufacturing | 2023 |
| Intek Adhesives Limited | Wholesale & retail | 1999 |
| Intrinsic Business Consultancy Ltd | Professional & scientific | 2018 |
| Issac Ltd | Health & social care | 2018 |
| Istanbul Pizza Ltd | Hospitality | 2024 |
| IT Construction Services Ltd | Construction | 2024 |
| IT Subsea Limited | Other services | 2017 |
| J B Tustain Motors Holdings Limited | Professional & scientific | 2010 |
| J D Body Repairs Limited | Wholesale & retail | 2019 |
| J Haghkar Engineering Limited | Mining & quarrying | 2015 |
| J Mullins Limited | Construction | 2025 |
| JAB Wind Ltd | Manufacturing | 2025 |
| JAR Property Investments Ltd | Real estate | 2026 |
| Jarrovian Limited | Professional & scientific | 2016 |
| Jason's Hair Salon Ltd | Other services | 2024 |
| Jbaxter Properties Limited | Real estate | 2023 |
| JBR Social Solutions Ltd | Health & social care | 2024 |
| JC Planning Limited | Professional & scientific | 2024 |
| JD Motorwerks Ltd | Wholesale & retail | 2025 |
| JD Properties (Northumberland) Limited | Real estate | 2025 |
| Jdeb Ltd | Other services | 2013 |
| Jdelgb Limited | Manufacturing | 2025 |
| Jeff Smith Technical Services Limited | Extraterritorial | 2014 |
| Jeffrey Seccombe Painters and Decorators Ltd | Construction | 2021 |
| JET Developments (NE) Limited | Construction | 2019 |
| JEX Motors Ltd | Wholesale & retail | 2024 |
| Jill Weatherburn Home Economist Limited | Hospitality | 2011 |
| Jingteng Ltd | Professional & scientific | 2026 |
| JJ Saunders Decorating Services Ltd | Construction | 2011 |
| JJR Ladhar Properties Limited | Real estate | 2021 |
| JLB Housing Ltd | Real estate | 2019 |
| JLB Survey Ltd | Other services | 2018 |
| JM Integrity Services Ltd | Mining & quarrying | 2023 |
| John Daley Inspection Services Limited | Professional & scientific | 2011 |
| John Jeffrey Roofing and Building Services Ltd | Construction | 2025 |