| H.Q. Hair Design Limited | Other services | 2002 |
| H20 Fitter @ the Coast Limited | Construction | 2019 |
| H2O Bathrooms @ the Coast Limited | Wholesale & retail | 2018 |
| Hadrian Business Solutions Limited | Professional & scientific | 2017 |
| Hadrian Estates Letting Agency Ltd | Real estate | 2012 |
| Hadrian Surveying & Consulting Ltd | Professional & scientific | 2020 |
| Hage NE Ltd | Construction | 2022 |
| Haggie Holdings Limited | Financial services | 2016 |
| Haig Property Investments Limited | Real estate | 2015 |
| Hair Boutique (Dudley) Ltd | Other services | 2023 |
| Hair by SR Limited | Other services | 2024 |
| Hana Beauty Ltd | Other services | 2016 |
| Handy Group NE Ltd | Manufacturing | 2024 |
| Happy Planet Creative Arts CIC | Administrative & support | 2014 |
| Harbour View (NE) Ltd | Hospitality | 2017 |
| Hardium Ltd | Professional & scientific | 2025 |
| Harmonic Ventures Ltd | Education | 2025 |
| Harness AI Limited | Information & communication | 2024 |
| Harper Lavoir Limited | Wholesale & retail | 2021 |
| Harratcg Ltd | Wholesale & retail | 2026 |
| Harry Jenkinson Ltd | Information & communication | 2017 |
| Harry Mutch Eventing Ltd | Other services | 2016 |
| Hartley Engineering Ltd | Professional & scientific | 2018 |
| Hartley Property Reactive Services Ltd | Construction | 2024 |
| Harvolt Engineering Limited | Professional & scientific | 2025 |
| Harwood & Rose Ltd | Administrative & support | 2017 |
| Haselhurst Consulting Ltd | Professional & scientific | 2022 |
| Hatch North East Properties Ltd | Real estate | 2022 |
| Hattrick Developments Ltd | Real estate | 2017 |
| Hazeplace Limited | Real estate | 1985 |
| Hazy Daze Ltd | Wholesale & retail | 2021 |
| HC Inspec Limited | Professional & scientific | 2020 |
| Headland Marketing LLP | | 2015 |
| Heads Holdings Limited | Financial services | 2018 |
| Healey Dodds Properties Ltd | Real estate | 2019 |
| Hearth MAP Limited | Information & communication | 2025 |
| Heasco Ltd | Health & social care | 2024 |
| Heathdale Apartments Ltd | Households | 2024 |
| Hectorshaze Vape Ltd | Wholesale & retail | 2020 |
| Hedley Residential Ltd | Real estate | 2022 |
| Hedley Retail Limited | Real estate | 2024 |
| Heidi Lilly Cosmedics Ltd | Other services | 2026 |
| Helen Sked Ltd | Administrative & support | 2017 |
| Helen Wheatley Art Ltd | Arts & recreation | 2024 |
| Hello Financial Limited | Financial services | 2018 |
| Hello Financial Services Limited | Financial services | 2018 |
| Hellsplinter Limited | Wholesale & retail | 2021 |
| Henry Hughes Property Services Limited | Administrative & support | 2006 |
| Herdtherumah Ltd | Real estate | 2018 |
| Heritage House Furniture Ltd | Wholesale & retail | 2026 |
| Heslington Holdings Limited | Hospitality | 2019 |
| Hexham Podiatry Ltd | Health & social care | 2026 |
| Hibbert Wealth Management Limited | Professional & scientific | 2016 |
| Hidden Depths Research Ltd | Professional & scientific | 2014 |
| High Kicks Community Interest Company | Health & social care | 2023 |
| High Tide Enterprises Limited | Professional & scientific | 2019 |
| Hillcroft North and South Ltd | Households | 1999 |
| Hindmarsh & Partners LLP | | 2016 |
| HNM Investments Limited | Real estate | 1929 |
| Hnmx Holdings Limited | Professional & scientific | 2007 |
| Hola Support Services Limited | Public administration | 2025 |
| Holiday Stays Ltd | Real estate | 2011 |
| Holmes PR and Communications Ltd | Professional & scientific | 2024 |
| Holystone OUT of School Club Limited | Education | 2013 |
| Holywell Electrics Limited | Other services | 1995 |
| Holywell Hospitality Ltd | Hospitality | 2023 |
| Holywell Property Management Company Limited | Households | 2008 |
| Homeward Bound North Limited | Real estate | 2020 |
| Honey Hive Play Cafe Ltd | Hospitality | 2026 |
| Honeycomb Deli Limited | Hospitality | 2018 |
| Honeypearls Limited | Wholesale & retail | 2025 |
| Hopkinson Brown Ltd | Administrative & support | 2021 |
| Horizons Property Group Ltd | Real estate | 2025 |
| Horizons Property Staging Ltd | Other services | 2024 |
| Hotpod Yoga Newcastle Limited | Arts & recreation | 2017 |
| Hotpotz Studio Limited | Manufacturing | 2023 |
| Hotspurcraft Limited | Hospitality | 2019 |
| Hounds and Heritage Ltd | Information & communication | 2026 |
| Hourplan Limited | Professional & scientific | 1990 |
| House Folk Events Ltd | Arts & recreation | 2024 |
| House of Beauty (Whitley Bay) Limited | Other services | 2014 |
| House of Element Ltd | Other services | 2021 |
| House of Jago Ltd | Real estate | 2018 |
| Howourth Industries Limited | Wholesale & retail | 2023 |
| Hoylage Limited | Wholesale & retail | 2018 |
| HSE Specialists Ltd | Professional & scientific | 2017 |
| Hues Home Decor Ltd | Construction | 2022 |
| Hunt Consultancy Services Limited | Information & communication | 2025 |
| Hunter Access Specialists Limited | Professional & scientific | 2023 |
| Hunter North Ltd. | Administrative & support | 2012 |
| Hush Ecom Ltd | Wholesale & retail | 2024 |
| Hush Research and Strategy Ltd | Professional & scientific | 2022 |
| HW Plumbing Limited | Construction | 2018 |
| HWG Property Developments Ltd | Real estate | 2020 |
| Hydmec Ltd | Professional & scientific | 2017 |
| I D P Property Limited | Real estate | 2020 |
| I'M Pipe Fitting Ltd | Transport & logistics | 2025 |
| I-Pools (Host) Limited | Arts & recreation | 2012 |
| I-Pools Limited | Arts & recreation | 2012 |
| IAN Black Legal Costs Ltd | Professional & scientific | 2024 |