| Gussco Limited | Hospitality | 2017 |
| GV Offshore Ltd | Other services | 2018 |
| GW Watts Ltd | Manufacturing | 2018 |
| H Bargain Ltd | Wholesale & retail | 2026 |
| H T Facilities Ltd | Administrative & support | 2016 |
| H&H Northeast Property Ltd | Real estate | 2020 |
| Hair & Beauty by Fusion Limited | Other services | 2019 |
| HAN Food Services Ltd | Hospitality | 2020 |
| Happiness Inn Takeaway Ltd | Hospitality | 2019 |
| Happydays Leisure Sixty Nine Limited | Hospitality | 2020 |
| Haqq&Insaf Ltd | Real estate | 2021 |
| Harlak Limited | Real estate | 2017 |
| Harlyn 2 Ltd | Financial services | 2025 |
| Harlyn Ltd | Financial services | 2020 |
| Harlyn Properties Limited | Real estate | 2025 |
| Harlyn Solutions Limited | Professional & scientific | 2020 |
| Harris Wilson Ltd | Construction | 2011 |
| Harrison Retail Limited | Wholesale & retail | 2020 |
| Harry Bolland Ltd | Real estate | 2018 |
| Harwood Enterprises Ltd | Hospitality | 2024 |
| Hassan Traders Limited | Administrative & support | 2018 |
| Havis and Daughters Ltd | Construction | 2020 |
| Hawk Information Technologies Limited | Information & communication | 2021 |
| HB Technical UK Ltd | Professional & scientific | 2022 |
| Headway Arts | Education | 1995 |
| Hearoes Limited | Wholesale & retail | 2024 |
| Heatworx Heating & Plumbing Solutions Ltd | Construction | 2007 |
| Hedley Nominees (NO. 1) Ltd | Professional & scientific | 2020 |
| Hedley Nominees (NO. 2) Ltd | Professional & scientific | 2020 |
| Hedley Solicitors Limited | Professional & scientific | 2017 |
| Helen Health Consultant Ltd | Health & social care | 2025 |
| Helping Hand Care Services Limited | Information & communication | 2025 |
| Hemnall Court Management Company Limited | Real estate | 2006 |
| Hengtian Limited | Hospitality | 2023 |
| Hetherington Joinery Ltd | Construction | 2024 |
| Hightower Home Improvements Ltd | Construction | 2025 |
| Hixi Hire Limited | Manufacturing | 2015 |
| Hodson Property Ltd | Real estate | 2025 |
| Holding Hearts Therapeutic Services Community Interest Company | Health & social care | 2019 |
| Holly Harding Lettings Limited | Real estate | 2023 |
| Home From Home Inns Ltd | Hospitality | 2025 |
| Honey and Hounds Ltd | Other services | 2025 |
| Hood Airport & Ice Limited | Manufacturing | 2000 |
| HOP Haven C.I.C. | Education | 2024 |
| Hopwood Maintenance Ltd | Professional & scientific | 2025 |
| Hopwood Property Maintenance Ltd | Real estate | 2025 |
| Horizon Works Limited | Professional & scientific | 2024 |
| Horizons North East Community Interest Company | Health & social care | 2018 |
| Hot TUB Lodges Ltd | Hospitality | 2026 |
| Hotpod Yoga Morpeth Ltd | Arts & recreation | 2020 |
| House of Champions Ltd | Wholesale & retail | 2025 |
| Htuk Tech Ltd | Professional & scientific | 2023 |
| Hudson Survival Arena Ltd | Arts & recreation | 2026 |
| Hunter Mane Construction Ltd | Construction | 2024 |
| Hyserve Marine Limited | Manufacturing | 2021 |
| I T Mechanical Services Ltd | Professional & scientific | 2024 |
| I. Finlayson Roofing Contractor Limited | Construction | 2008 |
| I4NTEGRITY Ltd | Professional & scientific | 2025 |
| IAN Cowie Investments Ltd | Real estate | 2021 |
| Icue Sports Limited | Education | 2015 |
| Igcs Property Ltd | Real estate | 2024 |
| Ilyay Ltd | Hospitality | 2020 |
| Improving Croft and Cowpen Quay Empowering and Training Communities Ltd | Other services | 2011 |
| Industry Logic Limited | Information & communication | 2012 |
| Infrastructure Labour Limited | Professional & scientific | 2022 |
| Infrastructure Site Services Limited | Manufacturing | 2016 |
| Innovation Consultancy Partnership Limited | Professional & scientific | 2005 |
| Inspired HR Ltd | Administrative & support | 2025 |
| Inspired Human Resources Ltd | Administrative & support | 2019 |
| Inspired Minds Adhd Ltd | Administrative & support | 2025 |
| Interceil Limited | Construction | 1982 |
| Interim FD Solutions Ltd | Professional & scientific | 2023 |
| IQ Cosmetics Ltd | Wholesale & retail | 2019 |
| Iris Beauty Group Ltd | Other services | 2018 |
| Isabella Community Association Ltd | Other services | 2006 |
| Islaaa Limited | Arts & recreation | 2018 |
| J a Masonry Limited | Construction | 2010 |
| J J P Electrical Contractors Limited | Construction | 2010 |
| J Maddison Developments Ltd | Construction | 2019 |
| J Nelson Renewables Ltd | Energy | 2021 |
| J&L Leisure Group Ltd | Arts & recreation | 2026 |
| J.A & J.G Property Limited | Real estate | 2025 |
| Jader Entertainments Ltd | Arts & recreation | 2015 |
| Jalal's Food Ltd | Hospitality | 2026 |
| James William Homes Ltd | Real estate | 2024 |
| Jamiecurle Ltd | Agriculture & fishing | 2022 |
| Jarjoura Medical Consultancy Limited | Professional & scientific | 2026 |
| Jarjoura Medical Ltd | Manufacturing | 2025 |
| Jasi Plumbing Limited | Construction | 2025 |
| JBC2 Ltd | Financial services | 2021 |
| Jeastlake Enterprises Limited | Hospitality | 2025 |
| JEG Inspection Limited | Professional & scientific | 2024 |
| Jella Afrique Limited | Wholesale & retail | 2024 |
| Jenks Creative Ltd | Professional & scientific | 2021 |
| JET COX Ltd. | Manufacturing | 1928 |
| JETALPHA07 Limited | Extraterritorial | 2024 |
| JFS Torbitt Limited | Administrative & support | 2019 |
| JG Building & Ground Services Ltd | Construction | 2021 |
| Jill's Dog Grooming Limited | Other services | 2014 |
| JJ Davis Electrical Limited | Construction | 2017 |