| High Grange Motor Company Ltd | Wholesale & retail | 2020 |
| High Hermitage Holiday Park Limited | Hospitality | 2020 |
| High Impact Development Limited | Education | 2009 |
| High Pressure Damproofing (Darlington) Limited | | 1979 |
| High Sixes Projects Limited | Professional & scientific | 2012 |
| High-Tech Access Ltd | Construction | 2015 |
| Highbrook Croft Managment Company Limited | Households | 2009 |
| Highland Medico-Legal Ltd | Health & social care | 2018 |
| Highlight Cleaning Services Limited | Other services | 2005 |
| Highroad 2 Riches Ltd | Transport & logistics | 2018 |
| Hightech GRP Ltd | Financial services | 2025 |
| Hightech Industrial Access Ltd | Manufacturing | 2020 |
| Hightech Industrial Rescue Division Ltd | Construction | 2026 |
| Hightech Industrial Services Ltd | Construction | 2026 |
| Hightech Industrial Training Ltd | Professional & scientific | 2021 |
| Hightech Plant Ltd | Administrative & support | 2025 |
| Hightech Property Ltd | Real estate | 2025 |
| Highthorn Developments Limited | Construction | 2018 |
| Highway North Ltd | Construction | 2025 |
| Highway Road Repairs Ltd | Construction | 2026 |
| Highways Road Seal Ltd | Construction | 2025 |
| Hillscott Projects Ltd | Manufacturing | 2020 |
| Hillside Convenience Limited | Wholesale & retail | 2022 |
| Hillside Dance Ltd | Arts & recreation | 2020 |
| Hilltop Care Services Ltd | Health & social care | 2018 |
| Hilltop Performance Ltd | Wholesale & retail | 2019 |
| Hilltop Performance Van Leasing Ltd | Administrative & support | 2020 |
| Hinds Building Services Limited | Construction | 2018 |
| Hirst Developments Limited | Administrative & support | 2017 |
| Hissbic Project Ltd | Other services | 2021 |
| Hk-Truck Limited | Transport & logistics | 2022 |
| HL Aesthetics and Training Ltd | Education | 2025 |
| HL Medical Aesthetics Ltd | Other services | 2022 |
| HL Protection Services Limited | Professional & scientific | 2019 |
| HLH Property Holdings Ltd | Real estate | 2025 |
| HLS Estates Ltd | Real estate | 2026 |
| HMA Ltd | Other services | 2013 |
| HMC Cathedral Limited | Real estate | 2023 |
| HMC Gosforth Limited | Administrative & support | 2005 |
| HMC Group Ltd | Real estate | 2004 |
| HMC Land Limited | Construction | 2005 |
| HMC Ventures Limited | Real estate | 2015 |
| Hmpl Group Holdings Limited | Financial services | 2023 |
| HMS Tees Valley Ltd | Real estate | 2024 |
| HN Developments (NE) Ltd | Construction | 2017 |
| HOC Capital Ltd | Financial services | 2026 |
| Hocal Ltd | Administrative & support | 2026 |
| Hodgson Property Development Ltd | Real estate | 2019 |
| Holdings in Exile Ltd | Financial services | 2023 |
| Holdings.Digital Limited | Information & communication | 2022 |
| Holistic Nurse UK Limited | Health & social care | 2021 |
| Hollis Property Holdings Ltd | Real estate | 2018 |
| Holly's Doggy Deli Ltd | Wholesale & retail | 2019 |
| Hollywood Handprint Ltd | Manufacturing | 2022 |
| Holmes Estates Ltd | Real estate | 2024 |
| Holmes Rigging Ltd | Professional & scientific | 2019 |
| Holstein Arboriculture Limited | Agriculture & fishing | 2025 |
| Home & Away Security Services | | 1990 |
| Home & Design Property Services Ltd | Construction | 2020 |
| Home Bubble Ltd | Professional & scientific | 2017 |
| Home Improvements Worcestershire Ltd | Construction | 2021 |
| Homeally Ltd | Information & communication | 2026 |
| Homes by Matthew Ltd | Real estate | 2024 |
| Homes for Communities Ltd | Real estate | 2025 |
| Homes on TAP Ltd | Hospitality | 2017 |
| Homeserve Properties Ltd | Real estate | 2026 |
| Honey Beauty Academy Ltd | Other services | 2026 |
| HOP155 Limited | Professional & scientific | 2023 |
| Hope's Edge CIC | Health & social care | 2025 |
| Hopes Wraps & Graphics Limited | Professional & scientific | 2025 |
| Hophit Ltd | Wholesale & retail | 2025 |
| Hopkins Properties Limited | Real estate | 2003 |
| Horizon Holiday Parks (NE) Limited | Hospitality | 2017 |
| Horizon Holiday Parks (Trossachs) Limited | Hospitality | 2019 |
| Horizon Holiday Parks (Yorkshire) Limited | Hospitality | 2024 |
| Horizon Holiday Parks Limited | Hospitality | 2021 |
| Horrors Inc Ltd | Information & communication | 2025 |
| Hospitaller Order of Saint John of GOD | Health & social care | 2010 |
| Host & Name Ltd | Information & communication | 2016 |
| Hosted Novel Ltd | Wholesale & retail | 2020 |
| Hot Catering Limited | Hospitality | 2008 |
| Hot Dog Pet Products Limited | Transport & logistics | 2016 |
| Hot Plate North East Limited | Hospitality | 2014 |
| Hotel 119 Ltd | Hospitality | 2023 |
| Houndgate Wines Limited | Hospitality | 2021 |
| House Build Solutions Limited | Construction | 2016 |
| House of Horrors Tattoo Collective Ltd | Other services | 2025 |
| House of TIG Welding and Fabrication Limited | Manufacturing | 2022 |
| House of Zana Limited | Wholesale & retail | 2023 |
| Hovingham Consultancy Ltd | Administrative & support | 2007 |
| Howard & Robson Ltd | Professional & scientific | 2025 |
| Howard & Ward Properties Ltd | Real estate | 2019 |
| Howard Builders (Darlington) Limited | Other services | 2018 |
| Howard Housing 2000 Limited | Real estate | 2000 |
| Howarth Assets Limited | Professional & scientific | 2015 |
| Howe Utilities Limited | Construction | 2016 |
| Howson Developments Limited | Professional & scientific | 2006 |
| Howtech Engineering Limited | Professional & scientific | 2012 |
| HR Change Collective Ltd | Professional & scientific | 2024 |
| HR2DAY Limited | Other services | 2010 |