| Hais Property Ltd | Real estate | 2022 |
| Haldenby Moor Wind Farm Limited | Energy | 2024 |
| Halo Recruitment Ltd | Administrative & support | 2014 |
| Hamilton Steel Buildings Ltd | Construction | 2017 |
| Hammani Hospitality Ltd | Hospitality | 2026 |
| Hamshi and Hareni Properties Ltd | Real estate | 2023 |
| Hanway Blade Repair Services Ltd | Manufacturing | 2018 |
| Hanwel Limited | Professional & scientific | 2021 |
| Happy WOK DH4 Ltd | Hospitality | 2025 |
| Hardy Gill Ltd | Financial services | 2025 |
| Hareni Ltd | Wholesale & retail | 2020 |
| Hari RAM Limited | Wholesale & retail | 2022 |
| Harmony Protected Ltd | Financial services | 2025 |
| Harness Renewables Limited | Construction | 2023 |
| Harper Building Services Limited | Construction | 2026 |
| HAS Pizza Ltd | Hospitality | 2024 |
| Haswells Homer Hill Farm Shop Limited | Wholesale & retail | 2003 |
| Hawley & Sons Limited | Wholesale & retail | 2023 |
| Hawthorn Estates North East Ltd | Real estate | 2016 |
| HC Executive Contracts Limited | Transport & logistics | 2021 |
| Head for the Border (Leeds) Limited | Financial services | 1989 |
| Heads UP Limited CIC | Education | 2017 |
| Healthy Chef Ltd | Hospitality | 2018 |
| Heart and Soul Television & Film Limited | Information & communication | 2018 |
| Heart Remind Community Interest Company | Arts & recreation | 2019 |
| Heartwood Skills C.I.C. | Education | 2018 |
| Heathland Windfarm Limited | Energy | 2010 |
| Hedley Mcewan Limited | Professional & scientific | 2010 |
| Helm Property Management Ltd | Real estate | 2024 |
| Hepple Property Care Limited | Construction | 2010 |
| Herrington Tyres Ltd | Wholesale & retail | 2020 |
| Hershaw Consulting Ltd | Professional & scientific | 2025 |
| Herspace Studio CIC | Education | 2025 |
| Hess Photography Ltd | Professional & scientific | 2019 |
| Hetton LE Hole Car Wash Ltd | Administrative & support | 2023 |
| Hidden Beauty by Emma Ltd | Other services | 2023 |
| Hides Fine Foods Limited | Hospitality | 2016 |
| Highbrooke Limited | Households | 2005 |
| Highflyers Education Consult Limited | Education | 2023 |
| Hilders Bespoke Interiors Limited | Construction | 2019 |
| Hilders Joinery Ltd | Construction | 2015 |
| Hipe Trains Ltd | Energy | 2026 |
| Hire ME Tool Hire Ltd | Wholesale & retail | 2002 |
| Hjcm Engineering Ltd | Professional & scientific | 2025 |
| HLO Recruitment Ltd | Administrative & support | 2022 |
| Hogg Engineering Ltd | Professional & scientific | 2015 |
| Holland Decorators Limited | Construction | 1990 |
| Home Design Products Limited | Construction | 2021 |
| Home Design Properties Ltd | Real estate | 2024 |
| Homecheck Surveying NE Ltd | Professional & scientific | 2024 |
| Homesmith North East Limited | Real estate | 2018 |
| Hopgarth Court Management Limited | Households | 2003 |
| Hopling Properties Limited | Real estate | 2003 |
| Horn’S Plant Services Ltd | Construction | 2026 |
| Houghton Carpet Centre Limited | Wholesale & retail | 1992 |
| Houghton Dog Groomers Limited | Other services | 2017 |
| Houghton Health Box Ltd | Hospitality | 2025 |
| Houghton Housing Group Ltd | Real estate | 2024 |
| Houghton Indian Limited | Hospitality | 2017 |
| Houghton Investments Family Leisure Limited | Arts & recreation | 1986 |
| Houghton Thai Boxing Academy Limited | Arts & recreation | 2023 |
| Houghton-Le-Spring Removals Limited | Transport & logistics | 2023 |
| Houghton-Le-Spring Residents CIC | Arts & recreation | 2021 |
| House of Apreda Ltd | Wholesale & retail | 2025 |
| House of Boutique Cakes Limited | Arts & recreation | 2012 |
| House of Crewe Ltd | Financial services | 2020 |
| Hover Media Ltd | Information & communication | 2020 |
| HPD Translations Ltd | Professional & scientific | 2021 |
| HRS Software Limited | Information & communication | 2019 |
| HSJ Services Ltd | Construction | 2025 |
| Hugall Ramsay Ltd | Administrative & support | 2024 |
| Hunter Electrical Services Limited | Construction | 2001 |
| I GOT YOU Properties Limited | Real estate | 2020 |
| I&C Properties Limited | Hospitality | 2017 |
| I.R.G. Roofing Limited | Construction | 2001 |
| IAN Holmes Financial Management Limited | Professional & scientific | 2008 |
| Ichthus Financial Services Limited | Financial services | 2008 |
| Identec Limited | Manufacturing | 1995 |
| IE Offshore Ltd | Professional & scientific | 2025 |
| Impact Forklift Training Limited | Education | 2015 |
| Imperial Blinds Limited | Wholesale & retail | 2015 |
| IN the Corners Cleaning Limited | Administrative & support | 2024 |
| Independent Midwife of the North Ltd | Health & social care | 2021 |
| Infinity Hair Crowns Ltd | Other services | 2026 |
| Inner Circle Services Ltd | Professional & scientific | 2025 |
| Intentional Clothing Ltd | Wholesale & retail | 2021 |
| Inter City Developers NE Ltd | Construction | 2024 |
| Iomez Property Ltd | Real estate | 2024 |
| Ironforge Athletics Ltd | Arts & recreation | 2025 |
| ITD Trading Limited | Wholesale & retail | 2025 |
| IVY Forge Games Ltd | Information & communication | 2024 |
| J & L C Clark Chemist Ltd | Wholesale & retail | 2010 |
| J & T Cars Ltd | Wholesale & retail | 2022 |
| J C Plastering (Durham) Ltd | Construction | 2024 |
| J C Wind Turbine Services Ltd | Manufacturing | 2017 |
| J K Civils Ltd | Construction | 2022 |
| J K F Cleaning & Security Services Ltd | Administrative & support | 2023 |
| J Lighten Properties Ltd | Real estate | 2018 |
| J Moor Farming Limited | Agriculture & fishing | 2011 |
| J R Grounds Maintenance Ltd | Water & waste | 2020 |