| Happy House Inn Limited | Hospitality | 2023 |
| Happy Little Sunbeams Day Nursery Limited | Health & social care | 2017 |
| Happy Pills Ltd | Wholesale & retail | 2024 |
| Happy Sapid - Serendib Spice & Sugarlicious Ltd | Hospitality | 2026 |
| HAPPYTREES18 Limited | Hospitality | 2024 |
| Haraf Homes Ltd | Administrative & support | 2024 |
| Harambe Investments Ltd | Real estate | 2020 |
| Harbour View Fish & Chips Ltd | Hospitality | 2026 |
| Harbron T&D Limited | Professional & scientific | 2014 |
| Hardware Supply Company (Middlesbrough) Limited | Wholesale & retail | 1920 |
| Hardwood JAM Ltd | Wholesale & retail | 2025 |
| Hardy Industrial Services Ltd | Manufacturing | 2020 |
| Harhat Cleaning Services Ltd | Administrative & support | 2025 |
| Haribo Contractor Solutions Limited | Construction | 2025 |
| Haris Signs Limited | Manufacturing | 2013 |
| Harker Garages Northern Limited | Wholesale & retail | 2012 |
| Harker-Lane Group Ltd | Other services | 2025 |
| Harland Specialist Cars Limited | Wholesale & retail | 2017 |
| Harleyray Ltd | Construction | 2026 |
| Harlow Carr Landscapes Limited | Administrative & support | 2001 |
| Harlsey Homes Ltd | Real estate | 2025 |
| Harlsey Property Limited | Real estate | 2022 |
| Haro NE Ltd | Hospitality | 2026 |
| Harper Engineering North East Ltd | Professional & scientific | 2026 |
| Harrierservices Ltd | Administrative & support | 2026 |
| Harris Brick Safety Systems Ltd | Construction | 2022 |
| Harris Safety Training Limited | Education | 2024 |
| Harris-Williams Property Ltd | Real estate | 2025 |
| Harrison & Barley Removals Ltd | Transport & logistics | 2025 |
| Harrison and Fletcher Limited | Manufacturing | 2014 |
| Harrison Building Solutions Limited | Construction | 2018 |
| Harrison Marine (London) Limited | Professional & scientific | 1981 |
| Harrisons Taxis Limited | Extraterritorial | 2012 |
| Harrisons Taxis of Whitby Limited | Extraterritorial | 2012 |
| Harrison’S and SON Ltd | Construction | 2026 |
| Harrow Business Consultancy Ltd | Wholesale & retail | 2025 |
| Harry Tanfield Limited | Arts & recreation | 2018 |
| Harry Woolf Sales and Engineering Ltd. | Manufacturing | 2003 |
| Harsha Prasad Ltd | Transport & logistics | 2026 |
| Harshiddhi MAA Limited | Wholesale & retail | 2022 |
| Hartlebury Green Hydrogen Limited | Manufacturing | 2024 |
| Hartlepool Boatmans Association Limited | Arts & recreation | 1986 |
| Hartlepool Eats Ltd | Hospitality | 2020 |
| Hartley & Bowron Consultants Ltd | Health & social care | 2022 |
| Hartom Consulting Ltd | Professional & scientific | 2024 |
| Harvey’S Site Services Ltd | Construction | 2020 |
| Hateley-Smith Properties Ltd | Real estate | 2018 |
| Hatfield Brand Management Ltd | Wholesale & retail | 2013 |
| Hathaway & Cope (Life & Pensions) Limited | Financial services | 1993 |
| Haus of Fiore Ltd | Professional & scientific | 2026 |
| Havana Restaurant Ltd | Hospitality | 2025 |
| Havanna Resturant Shisha Lounge Limited | Hospitality | 2020 |
| Have a Go on That Ltd | Real estate | 2020 |
| Haven Holiday Lettings Limited | Real estate | 2025 |
| Haven of Hope Residential Services Limited | Health & social care | 2026 |
| Hawk Electrical Services Ltd | Professional & scientific | 2025 |
| Hawk Fasteners Limited | Manufacturing | 1981 |
| Hawkins Advisory Limited | Professional & scientific | 2026 |
| Hawks Hire Teesside Limited | Administrative & support | 2026 |
| Hawsar Barber Ltd | Other services | 2024 |
| Hawthorn Engineering Limited | Professional & scientific | 1997 |
| Hawthorn Lodges Stokesley Limited | Hospitality | 2021 |
| Hawthorn Pharma Ltd | Administrative & support | 2018 |
| Hawxwell Engineering Ltd | Professional & scientific | 2024 |
| Haxin Limited | Professional & scientific | 2010 |
| Haya & Home Limited | Wholesale & retail | 2026 |
| Haynes PUB Group Ltd | Hospitality | 2025 |
| Hazik Logistics Limited | Transport & logistics | 2024 |
| HB Associates (NE) Ltd | Health & social care | 2023 |
| HB Car Sales Ltd | Wholesale & retail | 2026 |
| HC Electrical Services Limited | Manufacturing | 2026 |
| HC Electrical Solutions Ltd | Construction | 2025 |
| HD & RK Property Ltd | Households | 2023 |
| HD Auto Services Ltd | Wholesale & retail | 2022 |
| HD Electrical Automation Ltd | Construction | 2025 |
| HD Management Limited | Real estate | 2020 |
| HDH Retail Ltd | Hospitality | 2023 |
| HDH Wholesale Ltd | Wholesale & retail | 2023 |
| HDM Holdings Limited | Financial services | 2018 |
| HDS Development Limited | Professional & scientific | 2026 |
| Head Kandy Limited | Other services | 2017 |
| Headkandy 2 Limited | Other services | 2024 |
| Headkandy Hair Limited | Other services | 2024 |
| Headkandy Superior Limited | Wholesale & retail | 2021 |
| Headway Teesside | Health & social care | 2009 |
| Headwind Consultants Limited | Information & communication | 2021 |
| Healing Spaces North East Community Interest Company | Professional & scientific | 2022 |
| Health and Fitness EVO Limited | Professional & scientific | 2026 |
| Health Village CIC | Health & social care | 2021 |
| Health Your Way C.I.C. | Health & social care | 2013 |
| Healthy Fit Academy Ltd | Arts & recreation | 2019 |
| Healthy Tiger Limited | Health & social care | 2020 |
| Heanan Engineering Consultancy Ltd | Professional & scientific | 2025 |
| Heanan Engineering Services Ltd | Professional & scientific | 2019 |
| Heartfelt Support & Care Ltd | Health & social care | 2025 |
| HEAT4ENERGY Ltd | Construction | 2023 |
| Heating Spares Centre Limited | Wholesale & retail | 2011 |
| Heatpro Services (Teesside) Ltd | Construction | 2012 |
| Heavenly Rain Logistics and Retailing Ltd | Transport & logistics | 2026 |
| Heavy Lift Consulting Limited | Professional & scientific | 2013 |