| Hadrians Holdings (North East) Limited | Financial services | 2020 |
| Halls Decorating & Kitchen Resprays Ltd | Construction | 2023 |
| Hallspire Ltd | Wholesale & retail | 2025 |
| Halo Events and Projects Ltd | Professional & scientific | 2013 |
| Harjess Ltd | Transport & logistics | 2019 |
| Harrison Construction N.E Limited | Construction | 2021 |
| Hart Brothers Limited | Manufacturing | 1992 |
| Harts-End Bathroom Co. Limited | Construction | 2019 |
| Harveys Fish Bar NE LLP | | 2025 |
| Have to Love Active Limited | Wholesale & retail | 2018 |
| Haveli Lumley Ltd | Hospitality | 2024 |
| Hazim Residentials Limited | Households | 2020 |
| HB Beauty Salon Ltd | Other services | 2025 |
| HCR Services North East Ltd | Manufacturing | 2025 |
| HD Sealants Ltd | Construction | 2023 |
| HE Fortune 6688 Limited | Hospitality | 2026 |
| HE Fortune Limited | Hospitality | 2018 |
| HE3 Holdings Ltd | Financial services | 2026 |
| Hebron Medics Limited | Health & social care | 2015 |
| Hedley Joinery Limited | Construction | 2023 |
| Heel and TOE Ltd | Health & social care | 2008 |
| Hemptor Limited | Wholesale & retail | 2019 |
| Hennessy Childrens Service (East Mids) Limited | Extraterritorial | 2013 |
| Hennessy Childrens Services Limited | Health & social care | 2013 |
| Hennessy Living Group Limited | Health & social care | 2013 |
| Hepburn Properties Limited | Real estate | 1993 |
| Herdtex Products Limited | Manufacturing | 2014 |
| Hermoso Ltd | Manufacturing | 2025 |
| Hewitt Cladding Contractors Ltd | Construction | 2019 |
| Hewitt Envelope Systems Limited | Construction | 2014 |
| Hewson's Fabrications Ltd | Professional & scientific | 2025 |
| Heyno Limited | Real estate | 2018 |
| Hhhm Ltd | Transport & logistics | 2026 |
| Hibou Blanc Ltd | Hospitality | 2017 |
| High Level Kits Limited | Manufacturing | 2017 |
| Highgate 1971 Limited | Extraterritorial | 2014 |
| Hill and Bailey Properties Limited | Real estate | 2023 |
| Hillsmoor Farm Solar Farm Ltd | Energy | 2014 |
| Himalaya Restaurant (NE) Ltd | Hospitality | 2015 |
| Hire Connect Ltd | Administrative & support | 2024 |
| HIT Back Business Energy Claims Ltd | Professional & scientific | 2023 |
| HLM Robotic Automation Solutions Limited | Information & communication | 2025 |
| HLS Building Contractors Ltd | Construction | 2024 |
| HM Properties NE Limited | Real estate | 2026 |
| HM Retail Store Limited | Wholesale & retail | 2021 |
| HMA (North East) Consultants Limited | Professional & scientific | 2020 |
| HMA (North East) Limited | Construction | 2015 |
| Holisticlifestyle PA Ltd | Health & social care | 2012 |
| Holy Eagle Holiday Rental Management Ltd | Hospitality | 2019 |
| Holy Eagle Property Ltd | Real estate | 2016 |
| Holy Eagle Property Management Ltd | Real estate | 2019 |
| Home Awaiting Ltd | Wholesale & retail | 2025 |
| Home From Home Childminding Ltd | Health & social care | 2020 |
| Homemaker Property Ltd | Real estate | 2025 |
| Hope (NE) Ltd | Other services | 2018 |
| Hopper Wright Vinyls Ltd | Manufacturing | 2017 |
| Houghton Foot Clinic Limited | Health & social care | 2026 |
| House of Ajwa Ltd | Wholesale & retail | 2026 |
| House of TAN Ltd | Other services | 2023 |
| Housefx Limited | Real estate | 2020 |
| Howlett Boarding Kennels Ltd | Agriculture & fishing | 2023 |
| HP Chester Ltd | Hospitality | 2025 |
| HSH Management Limited | Construction | 2012 |
| Hudson Homes North East Ltd | Construction | 2020 |
| Hunter Aerospace Limited | Professional & scientific | 2014 |
| HW Asset Management Limited | Real estate | 2016 |
| HW Equipment Ltd | Wholesale & retail | 2021 |
| HWI Solutions Limited | Administrative & support | 2023 |
| Hypedmass Ltd | Wholesale & retail | 2026 |
| Hyper Light Station Ltd | Wholesale & retail | 2026 |
| I. D. Drilling North East Limited | Construction | 2024 |
| I.T. Professional Services Limited | Information & communication | 2000 |
| IAP Consultancy Ltd | Financial services | 2011 |
| IBE Airtnoch Limited | Energy | 2023 |
| IBE Flushdyke Limited | Energy | 2022 |
| IBE Kirkby Limited | Energy | 2024 |
| IBE LOW Common Limited | Energy | 2025 |
| IBE Lower Elker Limited | Energy | 2024 |
| IBE Mount Farm Limited | Energy | 2023 |
| IBE Old Works Limited | Energy | 2025 |
| IBE Salts Road Limited | Energy | 2022 |
| ID Property Development (NE) Limited | Construction | 2020 |
| Identity Hair and Beauty Washington Limited | Other services | 2017 |
| IF U Care Share | Health & social care | 2010 |
| IF U Care Share Foundation | Health & social care | 2011 |
| Ignix Limited | Manufacturing | 2025 |
| Ilianna Ltd | Hospitality | 2024 |
| IMB Investments Ltd | Real estate | 2022 |
| Imperial Claims Consultants Ltd | Financial services | 2010 |
| Imperial Lettings (North East) Limited | Real estate | 2009 |
| IMPRO2PRO Ltd | Arts & recreation | 2021 |
| Improtech Soccer Limited | Education | 2010 |
| IN the Closet Boutique Limited | Wholesale & retail | 2018 |
| Inchigeelagh O'Gorman Academy of Irish Dance Ltd. | Education | 2012 |
| Incite Web Design Limited | Information & communication | 2017 |
| Inclusive Connections Durham CIC | Education | 2025 |
| Industria Brand Energy Limited | Financial services | 2022 |
| Industria Resources LLP | | 2016 |
| Industria Rockingham Limited | Construction | 2021 |
| Industria Services Limited | Administrative & support | 2021 |