| Halo Plant Ltd | Administrative & support | 2025 |
| Halton Property Management Limited | Real estate | 1987 |
| Halton Property Services Limited | Real estate | 1983 |
| Hamill Limited | Financial services | 2016 |
| Hamilton Thomas Ltd | Information & communication | 2026 |
| Hamise Ltd | Other services | 2015 |
| Hammarit Fabrications Ltd | Construction | 2026 |
| Hampton Commerical Estates Ltd | Real estate | 2021 |
| Hams Global Limited | Wholesale & retail | 2025 |
| Hamsard 2342 Limited | Real estate | 2001 |
| Hamsard 2492 Limited | Real estate | 2002 |
| Hamsard 2517 (New Business) Limited | Real estate | 2006 |
| Hamsard 2517 Limited | Real estate | 2002 |
| Hamsard 2518 Limited | Professional & scientific | 2002 |
| Hamza Drireche Limited | Hospitality | 2017 |
| Hamza Solutions Limited | Real estate | 2018 |
| Hands of an Angel Limited | Health & social care | 2005 |
| Handy Helpers Property Maintenance North East Ltd | Construction | 2020 |
| Handy SAM Property Maintenance Ltd | Water & waste | 2025 |
| Hanhan Family Ltd | Other services | 2025 |
| Hanna Brothers Limited | Financial services | 2006 |
| Hansom Limited | Wholesale & retail | 2020 |
| Hapipod Ltd | Information & communication | 2020 |
| Happy Penguin Home Air Conditioning Limited | Energy | 2019 |
| HAPPYLAD4 Limited | Construction | 2026 |
| Haqs Trading Limited | Wholesale & retail | 2025 |
| Harambee Pasadia CIC | Arts & recreation | 2018 |
| Harbron Properties Ltd | Real estate | 2014 |
| Harefields GPS Ltd | Health & social care | 2025 |
| Harewood Green Investments Limited | Real estate | 2017 |
| Harish Kosuru Photography Limited | Professional & scientific | 2024 |
| Harland Construction Limited | Construction | 2025 |
| Harlgra Ltd | Information & communication | 2022 |
| Harlow Green Flat Management Company Limited | Households | 2026 |
| Harper Products Ltd | | 2010 |
| Harris in the City Limited | Professional & scientific | 2016 |
| Harris Trade Vans Direct Ltd | Wholesale & retail | 2025 |
| Harrison & SON Ltd | Administrative & support | 2003 |
| Harrison Legal Services Ltd | Professional & scientific | 2023 |
| Harry Developments Ltd | Construction | 2025 |
| Harry Osborne Investments Ltd | Real estate | 2025 |
| Harry Wildfire Limited | Information & communication | 2015 |
| Hartec Solutions Limited | Construction | 2015 |
| Hartington Court (Durham Road) Management Company Limited | Households | 2005 |
| Hartlepool Cable Group Limited | Financial services | 2024 |
| Hartlepool Cable Services Limited | Construction | 2022 |
| Hartlepool Property Solutions Ltd | Real estate | 2021 |
| Hartlepool PUB Company Limited | Hospitality | 2016 |
| Hartlepool Safety Services Ltd | Professional & scientific | 2007 |
| Hartman Estates Ltd | Real estate | 2020 |
| Hartman Ltd | Wholesale & retail | 2014 |
| Harton Central Limited | Professional & scientific | 2009 |
| Harton Project Services Ltd | Professional & scientific | 2015 |
| Hartside Enterprises Limited | Information & communication | 1929 |
| Harvest Properties (Holdings) Ltd | Real estate | 2024 |
| Harvest Properties Ltd | Real estate | 2023 |
| Harveys Transport Limited | Transport & logistics | 2018 |
| Hashmi Imaging Solution Ltd | Other services | 2016 |
| Hasibra-Gp Limited | Health & social care | 2018 |
| Hasik Investments Ltd | Real estate | 2024 |
| Hassaan M Limited | Wholesale & retail | 2026 |
| Hassan Kanani Ltd | Health & social care | 2025 |
| Hathaways the Law Firm Limited | Professional & scientific | 2012 |
| Hatz OFF IM Ltd | Administrative & support | 2015 |
| Havanna Hair and Beauty Limited | Other services | 2024 |
| Haven Holdings One Ltd | Real estate | 2019 |
| Haven Properties NE Limited | Real estate | 2022 |
| Haven Tyneside Ltd | Hospitality | 1993 |
| Hawks Road Community Nursery Limited | Education | 1991 |
| HAY Freehold Ltd | Real estate | 2026 |
| HAY Investment Group Ltd | Financial services | 2024 |
| HAY Property Investments Ltd | Real estate | 2024 |
| Hayama Limited | Wholesale & retail | 2023 |
| Hayat Healthcare NE Limited | Health & social care | 2013 |
| Haymarket Estates Ltd | Professional & scientific | 2012 |
| Hazel Blossom Florist & Cafe Ltd | Wholesale & retail | 2025 |
| Hazel Cleaners Ltd | Administrative & support | 2020 |
| Hazel Window Cleaners Limited | Administrative & support | 1998 |
| HBI Professional Services Ltd | Professional & scientific | 2010 |
| HBS Energy UK Limited | Wholesale & retail | 2022 |
| Hbsportfolios Ltd | Real estate | 2021 |
| HBT Property Ltd | Real estate | 2020 |
| HCA Energy Limited | Construction | 2025 |
| HDC Ferries Limited | Professional & scientific | 2017 |
| HDC Travel Limited | Professional & scientific | 2011 |
| Head Forth (North East) Limited | Wholesale & retail | 2013 |
| Headland Property Management Ltd | Real estate | 2007 |
| Headline Models Ltd | Administrative & support | 2014 |
| Heal Medical Services Ltd | Health & social care | 2016 |
| Heald Coaching and Consultancy Limited | Professional & scientific | 2023 |
| Health and Wellness Solutions Ltd | Health & social care | 2019 |
| Health Bridge Medical Ltd | Health & social care | 2025 |
| Health Fitness Supplements Ltd | Extraterritorial | 2019 |
| Health MED. Training Solutions Ltd | Education | 2020 |
| Healthcare Operational Living Advisors Ltd | Real estate | 2024 |
| Healthways Chemists (North East) Limited | Financial services | 1986 |
| Healthy Greens Ltd | Agriculture & fishing | 2018 |
| Heartfuel Ltd | Professional & scientific | 2021 |
| Heartscan Ltd | Health & social care | 2014 |
| Heathwood Property Limited | Real estate | 2024 |