| Hepber Ltd | Wholesale & retail | 2025 |
| Heresy IS My Therapy Ltd | Construction | 2024 |
| Hilbo Ltd | Wholesale & retail | 2025 |
| Hillbilly's Catering Limited | Hospitality | 2026 |
| Hindhaugh Opticians Limited | Health & social care | 2004 |
| Hindmarch Engineering Services Ltd | Construction | 2025 |
| Hire a Sunbed Ltd | Administrative & support | 2017 |
| HM Inspection Services Ltd | Professional & scientific | 2026 |
| Hodgins Saddlery & Valeting Limited | Arts & recreation | 2025 |
| Holly Ashford Protection Limited | Professional & scientific | 2023 |
| Holmes & Sons Electrical Services Limited | Construction | 2021 |
| Holt Car & Van Transport Limited | Transport & logistics | 2025 |
| Home Hire Sunbeds Ltd | Administrative & support | 2022 |
| Home on the Range Limited | Health & social care | 2014 |
| Homes Bright Ltd | Wholesale & retail | 2024 |
| Honest Leads Limited | Administrative & support | 2025 |
| Hope Global Trade Ltd | Wholesale & retail | 2026 |
| House of Style (NE) Limited | Other services | 2023 |
| Hunters Glazing Services Ltd | Construction | 2019 |
| Huntley & Cockrill Construction Ltd | Construction | 2025 |
| HY Grup Ltd | Wholesale & retail | 2026 |
| HZ Global Medical Ltd | Wholesale & retail | 2025 |
| I F Training Competency Consultancy Limited | Education | 2019 |
| IAN Hall Interiors Ltd | Construction | 2013 |
| IDA Commerce Ltd | Wholesale & retail | 2025 |
| IDL Eyes Ltd | Health & social care | 2025 |
| Iepcb Ltd | Hospitality | 2018 |
| Ilayda Demir Ltd | Wholesale & retail | 2025 |
| IMD Building Solutions Ltd | Construction | 2023 |
| Importonics Limited | Wholesale & retail | 2016 |
| Infinite Prosperity Store Ltd | Wholesale & retail | 2025 |
| Initial Group (Ritson Street) Ltd | Real estate | 2015 |
| Initial Group of Companies Limited | Professional & scientific | 2012 |
| Initial Propco (Belmont) Limited | Real estate | 2017 |
| Inklingwood Ltd | Information & communication | 2021 |
| Inspireod Ltd | Professional & scientific | 2023 |
| Inspirio Group Limited | Financial services | 2025 |
| Inspirio Wensleydale Hospitality Limited | Hospitality | 2025 |
| Integration Group Ltd | Real estate | 2026 |
| Integrity Energy Solutions Limited | Construction | 2022 |
| IRF Trade Ltd | Wholesale & retail | 2026 |
| IUD Ltd | Real estate | 2025 |
| Izzy JAP Cars Ltd | Wholesale & retail | 2023 |
| J & L (North East) Limited | Real estate | 2003 |
| J & S Installations (North East) Ltd | Construction | 2016 |
| J Hughes Consultancy Limited | Professional & scientific | 2022 |
| J M Jackson Construction Limited | Construction | 2003 |
| J Steel Renewables Ltd | Manufacturing | 2019 |
| J-Tec Electrical Solutions Ltd | Construction | 2025 |
| J.A. Jewitt (Meat) Limited | Wholesale & retail | 1979 |
| J.A.Jewitt | Wholesale & retail | 1959 |
| J.Race Property Ltd | Real estate | 2024 |
| James Alexander Thompson Limited | Financial services | 2023 |
| James King & Co. Ltd. | Professional & scientific | 1999 |
| James King Services Limited | Professional & scientific | 2019 |
| James Southern Property Services Limited | Real estate | 2009 |
| Jasmine ML Store Ltd | Wholesale & retail | 2026 |
| JAX Renewables Ltd | Construction | 2022 |
| JBD Arts Ltd | Arts & recreation | 2023 |
| JBD Productions Ltd | Arts & recreation | 2025 |
| JCS Aviation Consultancy Limited | Professional & scientific | 2025 |
| Jeff Dobson Marquee Hire Limited | Administrative & support | 2024 |
| Jegtech Ltd | Information & communication | 2022 |
| Jenson Bates Property Group Ltd | Real estate | 2025 |
| Jewelares Group Ltd | Wholesale & retail | 2026 |
| JFI Aesthetics Ltd | Health & social care | 2019 |
| JGM Heating Ltd | Construction | 2020 |
| JK Motors (NE) Limited | Wholesale & retail | 2021 |
| JL Courtspace Ltd | Arts & recreation | 2025 |
| JLL Property Management Limited | Households | 2026 |
| John Hart Commercials Limited | Wholesale & retail | 2014 |
| Johnston Business Group Ltd. | Administrative & support | 2015 |
| Jtwsb Creatives CIC | Arts & recreation | 2022 |
| Juniper Bridge Store Ltd | Wholesale & retail | 2026 |
| Just Sport (Group) Ltd | Professional & scientific | 2004 |
| Just Sport (Pro Club) Ltd | Wholesale & retail | 2004 |
| Just Tall Ltd | Wholesale & retail | 2021 |
| JV Logistics Consultants Ltd | Professional & scientific | 2023 |
| Kacmaz Global Ltd | Wholesale & retail | 2026 |
| Kan-Move (Lettings) Limited | Real estate | 2019 |
| Katherine Blakey Limited | Professional & scientific | 2019 |
| KAY REB Limited | Hospitality | 2023 |
| KAY Rope Solutions Limited | Construction | 2024 |
| Kaye Entertainment Ltd | Hospitality | 2021 |
| Kebab Take Away Ltd | Hospitality | 2026 |
| Kedory Ltd | Hospitality | 2023 |
| Keith Jones Transport Limited | Transport & logistics | 2024 |
| Kemotek Ltd | Wholesale & retail | 2025 |
| Kennedy Growth Consulting Limited | Professional & scientific | 2025 |
| Kiko Investment Ltd | Real estate | 2017 |
| Kims Hair (North East) Limited | Other services | 2025 |
| Kindred Veterinary Care Ltd | Professional & scientific | 2026 |
| Kindred Vets Ltd | Professional & scientific | 2026 |
| Kirk Merrington Pre-School Limited | Education | 2001 |
| Kitchen and Bathroom (NE) Ltd | Construction | 2020 |
| KL Core Values Limited | Professional & scientific | 2023 |
| Kleopatrax Ltd | Wholesale & retail | 2025 |
| KMA Haulage Ltd | Transport & logistics | 2025 |
| Korela Ltd | Wholesale & retail | 2025 |
| Kprmu Limited | Other services | 2020 |