| Global Flooring North East Limited | Wholesale & retail | 1983 |
| Glowled Limited | Manufacturing | 2006 |
| GMB Geological Limited | Mining & quarrying | 2021 |
| Gmc-Instruments UK Limited | Professional & scientific | 2015 |
| Go Courier Solutions Ltd | Transport & logistics | 2026 |
| GO2 Electrical Services Ltd | Construction | 2010 |
| Gold ARC Ltd | Wholesale & retail | 2025 |
| Gold Star Travel (NE) Ltd | Transport & logistics | 2023 |
| Golden FRY Peterlee Ltd | Hospitality | 2021 |
| Goodfellow & Goodfellow Ltd. | Wholesale & retail | 2011 |
| Gourmet Gainz Ltd | Hospitality | 2023 |
| GR Collective Solutions Limited | Professional & scientific | 2025 |
| Grand Recruit Limited | Administrative & support | 2024 |
| Grangetown Tyres Ltd | Wholesale & retail | 2020 |
| Great Ayton Filling Station Ltd | Wholesale & retail | 2016 |
| Greek Taste Ltd | Hospitality | 2023 |
| Green Planet Catering Products Limited | Wholesale & retail | 2018 |
| Growth Equestrian - the Wellbeing Project C.I.C. | Education | 2022 |
| Growth Equestrian Ltd | Other services | 2022 |
| Gwbc Walls & Ceilings Specialists Limited | Construction | 2010 |
| Gym Rebel Limited | Arts & recreation | 2019 |
| Hakan Barber UK 2 Ltd | Other services | 2025 |
| Hakan Barber UK Ltd | Other services | 2025 |
| Hallfield Renewables Limited | Energy | 2012 |
| Hamsworth Limited | Construction | 2025 |
| Harbro Electrical Wholesale Limited | Wholesale & retail | 1998 |
| Harris Joinery Limited | Manufacturing | 2023 |
| Hearts Leisure and Bars Ltd | Hospitality | 2024 |
| Heavens Gate Estates Ltd | Hospitality | 2025 |
| Hesleden Limited | Wholesale & retail | 1999 |
| Hong Kong Express 122 Ltd | Hospitality | 2025 |
| Horden Big Foot Studios CIC | Information & communication | 2025 |
| Horden Hand Carwash (NE) Ltd | Administrative & support | 2022 |
| Horden Lettings & Management Ltd | Real estate | 2021 |
| Horden Podiatry Clinic Ltd | Wholesale & retail | 2026 |
| Horden Youth and Community Centre | Education | 2008 |
| Howaystay Ltd | Real estate | 2021 |
| Howell Cummings Joinery Ltd | Construction | 2014 |
| Howletch and Shotton Primary Childcare Limited | Education | 2006 |
| Human-Centric AI Ltd | Information & communication | 2026 |
| HV Commissioning Services Limited | Construction | 2024 |
| Hydraulic Technical Services (NE) Limited | Professional & scientific | 2010 |
| Hydro Clean Nationwide Ltd | Administrative & support | 2025 |
| Hzci Associates Limited | Transport & logistics | 2018 |
| Ibis & Partners Ltd | Wholesale & retail | 2019 |
| Iconcept Property Ltd | Real estate | 2022 |
| Ieltsplus Limited | Health & social care | 2024 |
| Igneous Developments Ltd | Construction | 2021 |
| Infinitycast Media Ltd | Information & communication | 2023 |
| Innerglass Limited | Wholesale & retail | 1981 |
| Inside OUT North East CIC | Education | 2023 |
| Inside OUT North East Flourish Limited | Education | 2026 |
| Inside OUT North East Futures Limited | Education | 2026 |
| Installs Direct Limited | Administrative & support | 2020 |
| Inta Fitness Leisure Limited | Other services | 1996 |
| Intel Dispatch Ltd | Information & communication | 2026 |
| Intellelearn Ltd | Education | 2018 |
| Intrahealth Limited | Health & social care | 1999 |
| Intrahealth Pharmacy Limited | Wholesale & retail | 2006 |
| Investing Care Company Ltd | Administrative & support | 2025 |
| IPS NE Ltd | Professional & scientific | 2023 |
| Iris Business Services Ltd | Professional & scientific | 2014 |
| Iris Consultancy Solutions Ltd | Professional & scientific | 2014 |
| Iris Engineering & Technology Limited | Professional & scientific | 2005 |
| Iris EOT Trustee Limited | Financial services | 2023 |
| Iris Jean Designs Ltd | Wholesale & retail | 2026 |
| Iris Project Solutions Ltd | Professional & scientific | 2014 |
| Iris Service Solutions Ltd | Professional & scientific | 2014 |
| IS GG Properties Ltd | Real estate | 2023 |
| Isocom Limited | Manufacturing | 1994 |
| Istanbul Turkish Barber (Hordon) Ltd | Other services | 2016 |
| Ivic (Northern) Limited | Professional & scientific | 2010 |
| Ivic Lighting Limited | Professional & scientific | 2010 |
| Ivic Limited | Construction | 1989 |
| Izzy Fruits Ltd | Wholesale & retail | 2023 |
| J a Empire Ltd | Other services | 2025 |
| J Dodds Carpets Ltd | Wholesale & retail | 2015 |
| J S Training Services Ltd | Education | 2019 |
| J T Lewis Ltd | Manufacturing | 2017 |
| J W Renewables Ltd | Energy | 2012 |
| J&N Steelcraft UK Ltd | Manufacturing | 2020 |
| J.A.C.S. Accountancy Limited | Professional & scientific | 2011 |
| Jack Worrall Logistics Ltd | Transport & logistics | 2025 |
| JAG Clinical Limited | Health & social care | 2023 |
| Jamie Sanders Air Conditioning Ltd | Construction | 2023 |
| JB Rigging (North) Ltd | Administrative & support | 2025 |
| JBM Business Services Ltd | Transport & logistics | 2019 |
| JC Corporate Ltd | Wholesale & retail | 2025 |
| JDL Rooflines Ltd | Manufacturing | 2022 |
| Jesus Church Deliverance and Healing Ministry Ltd | Other services | 2009 |
| Jgtx Properties Ltd | Real estate | 2025 |
| JJ Logistics (NE) Ltd | Transport & logistics | 2025 |
| JLE Recovery Ltd | Transport & logistics | 2026 |
| JLT Electrical Contractors Limited | Construction | 2020 |
| JMF Fibre Ltd | Construction | 2023 |
| JMH Exploration Limited | Information & communication | 2014 |
| John Pyle Environmental Ltd | Professional & scientific | 2018 |
| Jointtech Limited | Construction | 2019 |
| Jomavic Properties Limited | Real estate | 2020 |
| JP Environmental NE Ltd | Professional & scientific | 2025 |