| Headland Construction NE Ltd | Construction | 2022 |
| Headland Folkfest Hartlepool CIC | Arts & recreation | 2025 |
| Health & Aesthetics by Faye Ltd | Other services | 2022 |
| Health and Safety Documents Limited | Information & communication | 2016 |
| Health First NE C.I.C. | Health & social care | 2025 |
| Health Pro LAB Ltd | Wholesale & retail | 2019 |
| Health, Safety & Fire Compliance Solutions Ltd | Other services | 2022 |
| Hearme FM Limited | Information & communication | 2016 |
| Hearts and Minds Play Therapy Ltd | Education | 2020 |
| HEAT4ENERGY Property Management Ltd | Real estate | 2025 |
| Hektare Project Management Limited | Professional & scientific | 2024 |
| Helen Clarke ANP Limited | Health & social care | 2015 |
| Helios Precision Engineering Ltd | Manufacturing | 2009 |
| Hellenic Velocity UK Limited | Financial services | 2024 |
| Helluva... Limited | Wholesale & retail | 2012 |
| Henderson Design Group Ltd | Wholesale & retail | 1998 |
| Henderson Inspection Services Limited | Construction | 2017 |
| Heortnesse Road 1965 Limited | Extraterritorial | 2014 |
| Hepa Dental Practice | Health & social care | 2008 |
| Herbovita Ltd | Wholesale & retail | 2025 |
| Here and NOW Hypnosis Limited | Health & social care | 2020 |
| Heretu Consulting Ltd | Information & communication | 2025 |
| Heron Engineering Consultancy Limited | Professional & scientific | 2019 |
| Herring Safety Services Ltd | Professional & scientific | 2013 |
| Herron Consultant Services Ltd | Other services | 2023 |
| Herron Electrical Limited | Construction | 2018 |
| Heugh GUN Battery Trust Limited | Arts & recreation | 2003 |
| Hexham Accident Repair Centre Limited | Extraterritorial | 2024 |
| HHH Welding Services Ltd | Other services | 2026 |
| Hidden Beauty Clinic Limited | Health & social care | 2019 |
| Hidden Gems of Sunderland Ltd | Information & communication | 2010 |
| High Frequency Bubble Ltd | Education | 2025 |
| High Task Limited | Construction | 2018 |
| High Tide Consulting Limited | Information & communication | 2008 |
| High Tide Group Holdings Limited | Financial services | 2019 |
| High Tide Group Limited | Information & communication | 2019 |
| High Tide Properties Limited | Real estate | 2016 |
| High Tide Services Limited | Information & communication | 2020 |
| High Tide Solutions Limited | Information & communication | 2012 |
| Higher Hire NE Ltd | Construction | 2025 |
| Highfield Furniture Moving & Building Ltd | Transport & logistics | 2021 |
| Highflow Traffic Management Ltd | Construction | 2025 |
| Hight Throston Properties Limited | Households | 2025 |
| Hightree Engineering Limited | Professional & scientific | 2023 |
| Hillcarter Developments Limited | Construction | 2019 |
| Hillcarter House Limited | Real estate | 2022 |
| Hillyer Properties Ltd | Real estate | 2020 |
| Hima Events & Caterers Ltd | Hospitality | 2025 |
| Hitch Heaven Weddings Limited | Extraterritorial | 2011 |
| Hitreal Limited | Professional & scientific | 1988 |
| Hiyas (GB) Ltd | Real estate | 2011 |
| HKA Technical Services Ltd | Professional & scientific | 2026 |
| HLE Services Ltd | Health & social care | 2022 |
| HOB Nail Books Limited | Other services | 2009 |
| Hodgson Family Funeral Home Ltd | Other services | 2022 |
| Hodgson Site Services Ltd | Manufacturing | 2017 |
| Hoedown Ltd | Hospitality | 2025 |
| Hogarth Wealth Management Ltd | Professional & scientific | 2021 |
| Hogg Global Logistics Ltd | Transport & logistics | 2019 |
| Holden Acland (Yarm) Ltd | Real estate | 2020 |
| Holistic Minds Consultancy Ltd | Health & social care | 2024 |
| Holly Capital Investments Limited | Financial services | 2025 |
| Holmes and Watson Limited | Extraterritorial | 2017 |
| Holroyd Contracting Ltd | Professional & scientific | 2021 |
| Home Design Flooring Limited | Wholesale & retail | 2008 |
| Homely Homes Group Ltd | Financial services | 2023 |
| Homestyle Interiors (NE) Limited | Construction | 2014 |
| Hoofprints Community Interest Company | Education | 2024 |
| Hooks Aesthetics Ltd | Other services | 2026 |
| Hope Performance Limited | Professional & scientific | 2020 |
| Hopkinson Communications Limited | Information & communication | 2010 |
| Hops and Cheese Limited | Wholesale & retail | 2017 |
| Horizon View Limited | Real estate | 2021 |
| Hornby Park Limited | Hospitality | 2019 |
| Hornsey (Hartlepool) Limited | Financial services | 2014 |
| Hornsey Hardware Limited | Wholesale & retail | 2014 |
| Hot Property Associates Limited | Real estate | 2002 |
| Houscout Ltd | Real estate | 2018 |
| House of Lineage Limited | Wholesale & retail | 2020 |
| Howdles Family Butchers Ltd | Wholesale & retail | 2023 |
| Howell & Mountney Ltd | Hospitality | 2020 |
| Hoxton Booths Ltd | Professional & scientific | 2025 |
| HP Aesthetics at Home Ltd | Other services | 2026 |
| HP Engineering Services Limited | Professional & scientific | 2024 |
| HPY Energy Consulting Limited | Professional & scientific | 2011 |
| HRS Residential Ltd | Real estate | 2017 |
| HSA Investment Holdings Limited | Real estate | 2024 |
| HSR Developments Limited | Real estate | 2017 |
| HSR Properties Limited | Real estate | 2016 |
| HTI Technical Services Ltd. | Manufacturing | 2022 |
| Hudsons 23 Limited | Transport & logistics | 2003 |
| Hughes Leisure Limited | Hospitality | 2019 |
| Hugo Land & Property Holdings Ltd | Construction | 2025 |
| Hugos Petfood Limited | Manufacturing | 2024 |
| Humbeglink Logistics Limited | Transport & logistics | 2023 |
| Hunslet Ltd | Manufacturing | 2021 |
| Hunter House Developments Limited | Other services | 2014 |
| Huntington Window Design Limited | Construction | 2025 |
| Huskies Basketball CIC | Education | 2022 |
| Huskisson Solutions Ltd | Professional & scientific | 2024 |