| HOG Expert Welding Ltd | Manufacturing | 2024 |
| Holiday Stylist Limited | Administrative & support | 2014 |
| Holistically Human Ltd | Education | 2025 |
| Holland & Sons (London) Ltd | Manufacturing | 2025 |
| Hollathans Limited | Extraterritorial | 2000 |
| Hollyhill Fish & Chips Ltd | Hospitality | 2018 |
| Holmside Studios Ltd | Information & communication | 2022 |
| Homes and Drives by Design Limited | Construction | 2014 |
| Homest Limited | Real estate | 2020 |
| Homewelly Business Limited | Real estate | 2023 |
| Hosein Pizza Limited | Hospitality | 2026 |
| Hotspots Homes Limited | Information & communication | 2019 |
| House Brown Limited | Hospitality | 2024 |
| House of Stitch Ltd | Manufacturing | 2024 |
| HT Nails Ltd | Other services | 2026 |
| Htkr Services Limited | Construction | 2025 |
| Humanbutbetter Ltd | Professional & scientific | 2024 |
| HW Tools Ltd | Wholesale & retail | 2020 |
| Hy-Dynamix Ltd | Administrative & support | 2014 |
| Hydrogenic Limited | Real estate | 2020 |
| Hyperhouse Limited | Real estate | 2020 |
| I S D (UK) Limited | Manufacturing | 1999 |
| I Want That Property Limited | Administrative & support | 2011 |
| Idamy Business Development Ltd | Households | 2020 |
| IF Only MEX Venture Limited | Real estate | 2016 |
| IF Then Else Creative Ltd | Information & communication | 2016 |
| ILA Beamish Limited | Hospitality | 2023 |
| Image Home Improvement Ltd | Construction | 2009 |
| Imperator Consulting Limited | Extraterritorial | 2015 |
| Imperator Developments Limited | Construction | 2018 |
| Imperator Group Limited | Professional & scientific | 2015 |
| Imperator Plant and Machinery Limited | Administrative & support | 2016 |
| Inclusive Atmosphere Ltd | Health & social care | 2023 |
| Inclusive Workshops Community Interest Company | Education | 2023 |
| Indian Kitchen DH9 Ltd | Hospitality | 2024 |
| Infinitino Company Limited | Real estate | 2020 |
| Insiro Limited | Manufacturing | 2016 |
| Inspire Insight C.I.C. | Professional & scientific | 2013 |
| Integrated Health Solutions Ltd | Health & social care | 2005 |
| Interio Brands Limited | Wholesale & retail | 2025 |
| Ionique Holdings Limited | Financial services | 2021 |
| Iron Tower Film Services Limited | Information & communication | 2023 |
| Irving Holmes Property Ltd | Real estate | 2022 |
| ISS Automation Ltd | Manufacturing | 2022 |
| Itechnical Services Limited | Other services | 2018 |
| Ithread Solutions Ltd | Information & communication | 2010 |
| IVY Cottage Nursery Limited | Health & social care | 2023 |
| Izzy Wizzy Cleaning Ltd | Administrative & support | 2024 |
| J and C Phone Home Limited | Real estate | 2020 |
| J C Selby Vehicle Services Ltd | Wholesale & retail | 2017 |
| J P Oxley Consulting Ltd | Professional & scientific | 2026 |
| J Purvis Contracting Ltd | Agriculture & fishing | 2024 |
| J&M Builders Limited | Construction | 2026 |
| J. Waugh Drilling Solutions Ltd | Construction | 2022 |
| JA Distributions Ltd | Wholesale & retail | 2026 |
| Jack Blenk Audio Ltd | Arts & recreation | 2020 |
| Jack Cherry Engineering Ltd | Professional & scientific | 2025 |
| Jacksons Stone Masonry and Building Services Limited | Construction | 2023 |
| Jake Baker Construction Limited | Construction | 2019 |
| James Brennan Constructions Limited | Wholesale & retail | 1980 |
| JAN Mitchell Limited | Real estate | 2015 |
| Janken Limited | Real estate | 2025 |
| JAS Property Services (NE) Ltd | Real estate | 2026 |
| JAX First AID Limited | Wholesale & retail | 2016 |
| JB Roofline Ltd | Construction | 2021 |
| JCC Properties Ltd | Real estate | 2002 |
| JD North East Properties Ltd | Households | 2026 |
| Jd's Chippy & Desserts Ltd | Hospitality | 2024 |
| JDL Capital Limited | Real estate | 2020 |
| Jennifer Thompson Strategy & Solutions Ltd | Professional & scientific | 2019 |
| JES Fast FRY Ltd | Hospitality | 2023 |
| Jeta House Properties Limited | Real estate | 2020 |
| JF Construction (North East) Ltd | Construction | 2025 |
| JG Groundworks (North East) Ltd | Construction | 2023 |
| JHK Estates Limited | Real estate | 2019 |
| JJP Residential Limited | Real estate | 2023 |
| JL Roof Care Ltd | Construction | 2021 |
| JMA Precision Limited | Professional & scientific | 2022 |
| Jmpubstheox Limited | Hospitality | 2026 |
| JO & Jean Limited | Real estate | 2024 |
| JO White Limited | Transport & logistics | 2015 |
| John Cook Commercial Law Limited | Professional & scientific | 2025 |
| John Painter Limited | Health & social care | 2018 |
| John Whitney Haulage Ltd | Transport & logistics | 2002 |
| Johnson & Hillas Developments Ltd | Construction | 2021 |
| Johnson Utility Networks Ltd | Construction | 2022 |
| Joker Competitions Limited | Arts & recreation | 2026 |
| Jole Limited | Real estate | 2020 |
| Jonny Armadillos Ltd | Hospitality | 2022 |
| Josefa LAU Limited | Real estate | 2024 |
| Joy to the Home Limited | Real estate | 2023 |
| Joyful Property Investment Ltd | Real estate | 2021 |
| Joymily Property Limited | Real estate | 2021 |
| Joyolution Ltd | Information & communication | 2025 |
| JP Barberzz Ltd | Other services | 2024 |
| JRC Fitness Limited | Arts & recreation | 2025 |
| JRH Investements Ltd | Real estate | 2026 |
| JS Integrity Limited | Extraterritorial | 2024 |
| JS Roofing & Metals Ltd | Construction | 2026 |
| Jsle Solutions Limited | Information & communication | 2014 |