| HR Solutions Yorkshire Limited | Administrative & support | 2016 |
| HRD Business Solutions Limited | Administrative & support | 2017 |
| HRH Exports Limited | Real estate | 2002 |
| Hrhp Ltd | Wholesale & retail | 2007 |
| Hstv Media Limited | Information & communication | 2007 |
| Htsp Ltd | Hospitality | 2023 |
| Huddle Property Group Limited | Real estate | 2025 |
| Hudson Acquisitions Limited | Real estate | 2024 |
| Hudson Properties & Letting Limited | Real estate | 2025 |
| Hudson Specialist Cars Ltd | Wholesale & retail | 2022 |
| Hugh J. Boswell Limited | Financial services | 1936 |
| Hughes Courier Services Ltd | Transport & logistics | 2025 |
| Hughes Training Systems Ltd | Professional & scientific | 2021 |
| Hugo's Antiques Limited | Wholesale & retail | 2014 |
| Huis Developments Ltd | Construction | 2017 |
| Hujem Medtech Consulting Ltd | Health & social care | 2025 |
| Hullah (Contractors) Limited | Construction | 1998 |
| Hummingbird Kitchen Designs Ltd | Wholesale & retail | 2025 |
| Huntcliffe Court Maintenance Limited | Households | 1980 |
| Huntcliffe House Maintenance Limited | Households | 1976 |
| Hunter Anderson Limited | Wholesale & retail | 2024 |
| Huntergate Consulting Limited | Information & communication | 2016 |
| Huntleigh Medical Healthcare Limited | Health & social care | 2018 |
| Hurcules FM Limited | Extraterritorial | 2020 |
| Hurst Court (Beckenham) Management Limited | Households | 1997 |
| Husk Beer Emporium Ltd | Wholesale & retail | 2019 |
| Husk Energy Limited | Construction | 2022 |
| Hussar Roofing Limited | Construction | 2023 |
| Hutchinson WM Ltd | Financial services | 2024 |
| Hutchison Recruitment Ltd | Administrative & support | 2011 |
| Huxley Belmont Limited | Wholesale & retail | 2024 |
| Hwayer Property Limited | Construction | 2024 |
| HY Joinery & Building Services Ltd | Construction | 2024 |
| Hygena Limited | Extraterritorial | 2011 |
| Hymie Ltd | Extraterritorial | 2015 |
| Hype Facilities Limited | Extraterritorial | 2025 |
| Hype Securities Limited | Extraterritorial | 2025 |
| Hyper Drive Ltd | Extraterritorial | 2012 |
| Hyper Horology Ltd | Wholesale & retail | 2019 |
| Hyper Loop Ltd | Extraterritorial | 2013 |
| Hyperion Property Consultants Ltd | Professional & scientific | 2012 |
| I & C Watts Limited | Construction | 1999 |
| I & I Marketing Ltd | Administrative & support | 2004 |
| I CAN Compose Ltd | Education | 2017 |
| I Care International Limited | Health & social care | 2001 |
| I D Maintenance Limited | Manufacturing | 2003 |
| I Empower Ltd | Education | 2021 |
| I'Anson Jewellers & Goldsmiths Limited | Wholesale & retail | 2013 |
| I4 Consulting Limited | Information & communication | 2011 |
| Iain Robertson Limited | Information & communication | 2008 |
| IAN Nicol Ltd | Professional & scientific | 2022 |
| IAN Taylor Free Range Eggs Limited | Wholesale & retail | 2018 |
| Iasm Ltd | Wholesale & retail | 2025 |
| IB Engineering Consultants Limited | Professional & scientific | 2008 |
| IB Planning Limited | Professional & scientific | 2017 |
| IB1ZA Limited | Extraterritorial | 2026 |
| IBD Bikes UK Limited | Wholesale & retail | 2009 |
| Ibdaa Alokoul Company Ltd | Wholesale & retail | 2024 |
| Ibet Ltd | Professional & scientific | 2025 |
| IBG Financial Services Limited | Financial services | 2007 |
| Ibis Consult Limited | Professional & scientific | 2005 |
| IBN Sina Supplies Ltd | Wholesale & retail | 2024 |
| Iboss Asset Management Limited | Financial services | 2015 |
| Iboss Limited | Financial services | 2007 |
| Ibtikar Group for Industry Ltd | Manufacturing | 2023 |
| Ic-Ed Limited | Professional & scientific | 2007 |
| Ichota Limited | Information & communication | 2024 |
| Ickringill Transport Services Ltd | Transport & logistics | 2024 |
| ID Catering Harrogate Limited | Hospitality | 2025 |
| IDC Harrogate Limited | Construction | 1991 |
| Identilid Limited | Administrative & support | 2015 |
| Ideology Images Limited | Professional & scientific | 2010 |
| Idigital Marketing Ltd | Professional & scientific | 2011 |
| Idiom Design Limited | Construction | 2006 |
| Idle Productions Ltd | Information & communication | 2014 |
| IDR Law Limited | Professional & scientific | 2017 |
| Iempowerclinics Ltd | Health & social care | 2024 |
| Ignata Properties Limited | Real estate | 2016 |
| Ignite Business Consulting Limited | Professional & scientific | 2014 |
| Ignite+ Limited | Construction | 2015 |
| IH Construction Ltd | Construction | 2022 |
| IH Professional Services Ltd | Professional & scientific | 2025 |
| IH Rise Limited | Administrative & support | 2026 |
| IHC Defence Solutions Ltd | Professional & scientific | 2020 |
| Ihire Tools Ltd | Administrative & support | 2025 |
| Ikonik Hair Ltd | Other services | 2020 |
| Ilissa Fashion UK Ltd | Wholesale & retail | 2025 |
| Ilkley Limited | Extraterritorial | 2026 |
| Illam Restaurant Ltd | Hospitality | 2022 |
| Illingworth Holdings Limited | Financial services | 2020 |
| Illumanize Ltd | Information & communication | 2008 |
| Image Concepts (Yorkshire) Ltd | Information & communication | 2012 |
| Image Design / Northern Editions Limited | Wholesale & retail | 2008 |
| Image Design Trustees Limited | Administrative & support | 2022 |
| Imaginaria Limited | Other services | 2022 |
| Imagine Build MT Ltd | Information & communication | 2014 |
| Imagine Investments MT Ltd | Financial services | 2020 |
| Imagined Things Ltd | Wholesale & retail | 2017 |
| Immortal Images Ltd | Professional & scientific | 2012 |
| Immpress Ltd | Manufacturing | 2003 |