| Hedley's Coffee Company Ltd | Hospitality | 2026 |
| Hedon Care Ltd | Health & social care | 2012 |
| Heights Access Services Ltd | Construction | 2018 |
| Heinzmann UK Limited | Manufacturing | 1983 |
| Helen Dixon Carroll Limited | Other services | 2016 |
| Helen Nails Ltd | Other services | 2026 |
| Hello Teesside Ltd | Households | 2023 |
| Hellovicco Ltd | Arts & recreation | 2021 |
| Helping With Inclusive Care Ltd | Administrative & support | 2025 |
| Hemlington Boxing Club C.I.C. | Arts & recreation | 2024 |
| Hemlington Golden FRY Ltd | Hospitality | 2023 |
| Henderson Inspections Limited | Professional & scientific | 2025 |
| Henpro Limited | Professional & scientific | 2018 |
| Henry & Junior Plumbing & Heating Ltd | Construction | 2025 |
| Henry Automotive Ltd | Wholesale & retail | 2024 |
| Henry Peacock,Limited | | 1935 |
| Henry's Pizza Box Ltd | Wholesale & retail | 2025 |
| Hepspection Limited | Professional & scientific | 2022 |
| Herbaspot Ltd | Wholesale & retail | 2025 |
| Herbie House Supplies Ltd | Wholesale & retail | 2023 |
| Heritage Classics of Teesside Limited | Manufacturing | 2009 |
| Heritage Horizons Ltd | Real estate | 2022 |
| Hesk & Hesk Ltd | Construction | 2019 |
| Heslop M Limited | Wholesale & retail | 2024 |
| HEW EOT Limited | Other services | 2022 |
| HEY Houselife Ltd. | Hospitality | 2018 |
| Heyderz Ltd | Wholesale & retail | 2026 |
| Hezzy Holdings Limited | Real estate | 2023 |
| HF Services Ltd | Construction | 2026 |
| HF Welding Services Ltd. | Professional & scientific | 2026 |
| Hfashion House Ltd | Arts & recreation | 2024 |
| HGB Services NE Limited | Professional & scientific | 2019 |
| HGM Solutions Limited | Mining & quarrying | 2019 |
| HH Coatings Ltd | Construction | 2026 |
| Hhcp Services Limited | Construction | 2026 |
| HHE Lifting Ltd | Mining & quarrying | 2025 |
| HI Mavis Ltd | Professional & scientific | 2018 |
| HI Rope Limited | Other services | 2011 |
| Hi&Cs Limited | Professional & scientific | 2025 |
| Hi-Line Ceilings Limited | Construction | 2015 |
| Hibbah N.E Limited | Households | 2024 |
| HIC36 Ltd | Professional & scientific | 2011 |
| Hickston Limited | Manufacturing | 2014 |
| Hideaway-Redcar Limited | Other services | 2021 |
| HIF Installations Ltd | Information & communication | 2018 |
| Hifza News Ltd | Wholesale & retail | 2021 |
| High Force Leisure (Scarborough) Limited | Real estate | 2023 |
| High Sky Estate Limited | Real estate | 2025 |
| High Vision Facades and Cladding Ltd | Construction | 2025 |
| Highcliff Marine Services Ltd | Transport & logistics | 2023 |
| Higher Trevartha Solar Park Limited | Energy | 2012 |
| Highgleam Window Cleaning Ltd | Administrative & support | 2020 |
| Highland Wear Ltd | Wholesale & retail | 2018 |
| HIK Property Services Ltd | Real estate | 2024 |
| Hildreth Limited | Wholesale & retail | 2025 |
| Hill Baxter Group Ltd | Financial services | 2024 |
| Hill Yard Management Company Limited | Households | 2017 |
| Hillano Limited | Wholesale & retail | 2024 |
| Hillier Jewellers Limited | Wholesale & retail | 2016 |
| Hills Engineering Company Ltd | Professional & scientific | 2024 |
| Hills UK Services Limited | Construction | 2025 |
| Hill’S Inspection Ltd | Professional & scientific | 2021 |
| Hilton Wordsworth Financial Services Limited | Financial services | 2005 |
| Hinton Design Limited | Professional & scientific | 2009 |
| Hire IT Solutions Ltd | Households | 2019 |
| HIS Tech Ltd | Wholesale & retail | 2022 |
| HIT the Space Bar Limited | Administrative & support | 2023 |
| Hitchinson Access Limited | Professional & scientific | 2019 |
| Hive -V Limited | Real estate | 2014 |
| Hivecommercial Ltd | Professional & scientific | 2019 |
| Hiwot Limited | Wholesale & retail | 2022 |
| HJA Construction Limited | Construction | 2024 |
| HK Electrics Limited | Construction | 2015 |
| HK Legacy Estates Ltd | Real estate | 2025 |
| HK Legacy Planning Ltd | Financial services | 2025 |
| HK Properties NE Limited | Real estate | 2026 |
| HKA Holdings Ltd | Transport & logistics | 2026 |
| HLG Access Solutions Ltd | Professional & scientific | 2025 |
| HLG Property Ltd | Real estate | 2019 |
| HM Barbers 2025 Ltd | Other services | 2025 |
| HM Digital Solution Ltd | Wholesale & retail | 2025 |
| HM Lazenby Limited | Hospitality | 2019 |
| HM Sisters Ltd | Wholesale & retail | 2025 |
| HMD Enterprises Limited | Wholesale & retail | 2025 |
| HMD Management Ltd | Real estate | 2024 |
| HMF Divisions Ltd | Manufacturing | 2024 |
| HMH Ltd | Health & social care | 2023 |
| HMM (NE) Ltd | Wholesale & retail | 2025 |
| HNW Law Limited | Professional & scientific | 2021 |
| Hobbs EMC Limited | Administrative & support | 2026 |
| HOD Media Ltd | Arts & recreation | 2025 |
| Hodgson Engineering Limited | Manufacturing | 2017 |
| Hodgson Financial Ltd | Financial services | 2020 |
| Hodgson Joinery Limited | Construction | 2025 |
| Hodgsons Unique MOT & Autoservices Limited | Wholesale & retail | 2017 |
| Hodi Ltd | Professional & scientific | 2025 |
| Hogg Sauce Limited | Manufacturing | 2025 |
| Hoko Group Estate Management Ltd | Real estate | 2024 |
| Holden North Ltd | Information & communication | 2024 |
| Holden Techserv Limited | Information & communication | 2011 |