| Hungry Gannet NE Limited | Hospitality | 2025 |
| Hungry Tech Ltd | Information & communication | 2018 |
| Hungryscarecrow Limited | Manufacturing | 2015 |
| Hunter House Property Limited | Real estate | 2024 |
| Huss Invest Ltd | Real estate | 2025 |
| Hussa Limited | Wholesale & retail | 2025 |
| Hussain Mengal Limited | Wholesale & retail | 2026 |
| Hutchinson Brothers Limited | Financial services | 2026 |
| Hutchinson D Limited | Wholesale & retail | 2012 |
| Hutchinson Digital Consulting Limited | Information & communication | 2025 |
| Hutchinson Technical Services (NW) Ltd | Manufacturing | 2009 |
| Hutchinson Technical Services Limited | Transport & logistics | 2002 |
| Hutchinson Transport Limited | Transport & logistics | 2000 |
| Hutchinson's Plumbing and Heating Ltd | Construction | 2025 |
| Hutt & Co Properties Ltd | Real estate | 2021 |
| Hutton Carpets Ltd | Construction | 2025 |
| Huzzy’S Plumbing and Heating Ltd | Construction | 2024 |
| HV & LV Solutions Ltd | Professional & scientific | 2022 |
| HWG ENG Consultants Ltd | Professional & scientific | 2021 |
| HWG Luxury Living Ltd | Wholesale & retail | 2021 |
| Hybay Limited | Administrative & support | 2002 |
| Hybrid Architectural Ltd | Manufacturing | 2017 |
| Hybrid Fitness Teeside Limited | Arts & recreation | 2024 |
| Hybrid Solar Solutions Ltd | Energy | 2023 |
| Hyde Park Guest House Ltd | Hospitality | 2020 |
| Hyderabadi Kitchen Ltd | Hospitality | 2022 |
| Hyderabadi Kitchen Takeaway Ltd | Hospitality | 2025 |
| Hydro Karts Ltd | Manufacturing | 2024 |
| Hypadel Group Ltd | Financial services | 2026 |
| Hypadel Killingworth Opco Ltd | Arts & recreation | 2026 |
| Hypadel Killingworth Propco Ltd | Real estate | 2026 |
| Hypadel Services Ltd | Professional & scientific | 2026 |
| Hypadel Teesside Opco Ltd | Arts & recreation | 2026 |
| Hypadel Teesside Propco Ltd | Real estate | 2026 |
| Hypehut Ltd | Wholesale & retail | 2026 |
| Hypno JO Limited | Health & social care | 2020 |
| Hypnobirthing Your Way Ltd | Education | 2024 |
| I & D Consultancy Limited | Professional & scientific | 2011 |
| I a Islam Ltd | Wholesale & retail | 2022 |
| I a Odontic Ltd | Health & social care | 2026 |
| I Heritage CIC | Real estate | 2024 |
| I Love Comparing Ltd | Information & communication | 2020 |
| I S Compliance Limited | Professional & scientific | 2024 |
| I-Snapshot Limited | Information & communication | 2006 |
| I. M. Subs Limited | Hospitality | 2014 |
| I. Smeaton Ltd | Transport & logistics | 2015 |
| I.K. Howard Services Ltd | Construction | 2026 |
| I/C/U Window Cleaner Ltd | Administrative & support | 2021 |
| IAD Writing Ltd | Arts & recreation | 2016 |
| Iajg Engine Limited | Professional & scientific | 2024 |
| IAM Community Ltd | Education | 2025 |
| IAN Bird Contracting Ltd | Professional & scientific | 2025 |
| IAN T Wright Consulting Limited | Administrative & support | 2018 |
| IAU Worldwide Limited | Information & communication | 1998 |
| IB Professional Cleaners Ltd | Administrative & support | 2024 |
| IB UK Holdings Ltd | Financial services | 2024 |
| Ibis Motors Ltd | Wholesale & retail | 2024 |
| Iboxed Limited | Transport & logistics | 2022 |
| Ibraheem Stores Limited | Wholesale & retail | 2025 |
| Ibroh Leather Ltd | Manufacturing | 2023 |
| IC Spray Limited | Wholesale & retail | 2016 |
| Icare Health Services Ltd | Health & social care | 2021 |
| ICB Glazing and Cladding Limited | Construction | 2021 |
| ICB Property Management Limited | Financial services | 2025 |
| Iceton Lifting Solutions Ltd | Professional & scientific | 2024 |
| Ichina Wholesale Ltd | Wholesale & retail | 2013 |
| Icome Resource Ltd | Wholesale & retail | 2025 |
| Iconic Communications Limited | Information & communication | 2026 |
| Iconkay-Tech UK Ltd | Information & communication | 2018 |
| Idata Associates Ltd | Information & communication | 2014 |
| IDEAS2BIZ Ltd | Information & communication | 2023 |
| Idibelo Ltd | Manufacturing | 2026 |
| IE Suleman NE Ltd | Construction | 2024 |
| IEX Projects Ltd | Professional & scientific | 2018 |
| IFK Properties Limited | Real estate | 2025 |
| IFL Operations Ltd | Professional & scientific | 2026 |
| IFV North East Limited | Construction | 2026 |
| IG Systems UK Ltd | Administrative & support | 2003 |
| Ignite Fitness by Jack Doyle Limited | Arts & recreation | 2020 |
| Ignite Your Brand NE Limited | Professional & scientific | 2025 |
| Igniteshield Engineering (NE) Ltd | Professional & scientific | 2025 |
| IH Management Limited | Other services | 2022 |
| II Subs Ltd | Hospitality | 2023 |
| IIB Lifting Ltd | Professional & scientific | 2019 |
| IJR Rigging & Construction Ltd | Professional & scientific | 2025 |
| IJW H&S Ltd | Professional & scientific | 2024 |
| Iklin Global Freight and Logistics Limited | Transport & logistics | 2026 |
| ILI Legal Group Ltd | Professional & scientific | 2025 |
| Illingworth Ltd | Construction | 2016 |
| Illingworth Renewables Ltd | Construction | 2025 |
| Illuminate Safety Ltd | Professional & scientific | 2025 |
| Illustrated Identity Ltd | Wholesale & retail | 2015 |
| Illys Plumbing and Heating Limited | Construction | 2017 |
| Imaan Consultants NE Limited | Professional & scientific | 2025 |
| Imagine That Design Ltd | Administrative & support | 2023 |
| Imake CIC | Administrative & support | 2025 |
| Imcres Ltd | Public administration | 2026 |
| Imew Limited | Professional & scientific | 2020 |
| IMI Accountancy Ltd | Professional & scientific | 2022 |
| Immigration Advice Centre Ltd | Professional & scientific | 2011 |