| Hashtag Heat Ltd | Construction | 2024 |
| Hashtagg Limited | Real estate | 2014 |
| Hasirpa Properties Ltd | Real estate | 2025 |
| Haskoll Limited | Professional & scientific | 1988 |
| Hass CAB Ltd | Transport & logistics | 2023 |
| Hass Equipment Limited | Manufacturing | 2019 |
| HASS25 Limited | Real estate | 2025 |
| Hassan Hair LAB Limited | Other services | 2020 |
| Hassan Real Estate Ltd | Real estate | 2024 |
| Hassanmustafa Limited | Health & social care | 2025 |
| Hassanz Property Limited | Real estate | 2025 |
| Haswell-Lyons Ltd | Professional & scientific | 2022 |
| Hatch Hospitality Ltd | Hospitality | 2025 |
| HATCH76 Ltd | Hospitality | 2018 |
| Hatem Construction Limited | Construction | 2024 |
| Hatfield Lane Armthorpe Management Company Limited | Households | 2022 |
| Hats & Scrolls Ltd | Hospitality | 2023 |
| Hats Plus Caps Ltd | Wholesale & retail | 2020 |
| Hatti Holdings Limited | Real estate | 2016 |
| Hattons Travel Ltd | Transport & logistics | 2026 |
| Hattyb Limited | Professional & scientific | 2023 |
| Haugh Property Investment Ltd | Real estate | 2020 |
| Haughton Square (Humshaugh) Management Company Limited | Households | 2017 |
| Haumea Health Limited | Health & social care | 2026 |
| Haus Holdings Limited | Professional & scientific | 2018 |
| Haus of Finance Ltd | Administrative & support | 2022 |
| Haus of Zizi Limited | Other services | 2025 |
| HAUS21 Property Management Ltd | Real estate | 2025 |
| Havana Properties Limited | Real estate | 2020 |
| Have a Day Properties Ltd | Real estate | 2026 |
| Havelock Park Management Company Limited | Real estate | 2024 |
| Haven Residential Management Limited | Wholesale & retail | 2025 |
| Havengate Property Management Ltd | Real estate | 2025 |
| Havenharmony Ltd | Wholesale & retail | 2025 |
| Havensites Realty Ltd | Real estate | 2025 |
| Haventide Ltd | Other services | 2023 |
| Haventime Limited | Other services | 1997 |
| Havering Glazing+ UK Limited | Construction | 2025 |
| Havilla Social Care Ltd | Public administration | 2020 |
| Having a Party Limited | Wholesale & retail | 2017 |
| Havio Designs Limited | Professional & scientific | 2020 |
| Hawa Lounge Ltd | Hospitality | 2018 |
| Hawaa Ayaat Properties Limited | Real estate | 2026 |
| Hawar Fast Food Ltd | Hospitality | 2019 |
| Hawdon Bespoke Ltd | Professional & scientific | 2025 |
| Hawdon Work Surfaces Limited | Manufacturing | 2017 |
| Hawk Heating and GAS Ltd | Construction | 2025 |
| Hawk Real Estate Ltd | Real estate | 2021 |
| Hawkins Rigging and Lifting Ltd | Construction | 2022 |
| Hawkpost Limited | Financial services | 2002 |
| Hawkside Ltd | Real estate | 2020 |
| Hawksley Residents Association | Real estate | 1997 |
| Hawkwellhead Ltd | Professional & scientific | 2023 |
| Hawthorn Court Management Company Limited | Households | 2002 |
| Hawthorn Grange Management Company (NO.2) Ltd | Households | 2014 |
| Hawthorn Grange Management Company Limited | Real estate | 2007 |
| Hawthorn Leslie Fabrications Limited | Manufacturing | 1991 |
| Hawthorn Mews (Maintenance) Limited | Real estate | 1986 |
| Hawthorne Properties (NE) Limited | Real estate | 2024 |
| Hawthorns Windows Limited | Construction | 1997 |
| Haxah Ltd | Information & communication | 2025 |
| HAY & Kilner LLP | | 2017 |
| HAY & Kilner Trust Corporation Limited | Administrative & support | 2024 |
| Hayati Rental Ltd | Administrative & support | 2025 |
| Haycombe Holdings | Financial services | 2025 |
| Hayley Down Nutrition Limited | Health & social care | 2022 |
| Hayloft Care Limited | Administrative & support | 2025 |
| Haystack App Limited | Information & communication | 2019 |
| Hayton Builders Limited | Wholesale & retail | 1982 |
| Hayward Avenue Lettings North East Limited | Real estate | 2025 |
| Hazara NE Limited | Construction | 2017 |
| Hazel Court Management Company (Haswell) Limited | Real estate | 2005 |
| Hazeldene Mews (Tynemouth) Management Company Limited | Households | 1993 |
| Hazelmere Court (Bedlington) Management Company Limited | Real estate | 2014 |
| Hazem Jouda Ltd | Health & social care | 2023 |
| Hazlerigg Stores Ltd | Wholesale & retail | 2019 |
| HB Opticians Ltd | Wholesale & retail | 2005 |
| HBH Investments Limited | Real estate | 2012 |
| HBO Engineering Ltd | Professional & scientific | 2025 |
| HBS Fabrication Northwest Limited | Manufacturing | 2020 |
| HC Educational Psychology Limited | Education | 2026 |
| HCA (NE) Limited | Health & social care | 2023 |
| Hcjj Property Ltd | Real estate | 2025 |
| HD Cleaning and Maintenance Ltd | Administrative & support | 2023 |
| HD Pharmaceuticals Ltd | Health & social care | 2022 |
| Hdhnt Technologies Limited | Information & communication | 2026 |
| HDI Consultancy Ltd | Professional & scientific | 2024 |
| HDI Properties Ltd | Construction | 2017 |
| HDJ Electrical Limited | Construction | 2013 |
| HDP IT Services Ltd | Information & communication | 2025 |
| Hdresidence Limited | Real estate | 2024 |
| HE Brand Strategy & Design Ltd | Professional & scientific | 2021 |
| HEA (NE) Ltd | Hospitality | 2019 |
| Head Shoulders Knees and Toes Limited | Real estate | 2025 |
| Headline Barbers Limited | Other services | 2016 |
| Headliners (UK) | Health & social care | 1994 |
| Heads HR Limited | Administrative & support | 2013 |
| Headway Tyneside | Health & social care | 2009 |
| Healermed Instruments Ltd | Wholesale & retail | 2022 |
| Healing Beyond Borders CIC | Health & social care | 2025 |