| Huichao Chen Limited | Wholesale & retail | 2026 |
| Hullabaloo Media Limited | Information & communication | 2012 |
| Humanxdesign Ltd | Professional & scientific | 2023 |
| Hunger Hill Cafe Ltd | Hospitality | 2023 |
| Hunt Haulage Limited | Transport & logistics | 2010 |
| Hunters Garage & SON Ltd | Wholesale & retail | 2021 |
| Hunters Properties (Yorkshire) Limited | Real estate | 2025 |
| Hurtley Plumbing & Heating Limited | Construction | 2017 |
| Hussain Building Services Ltd | Construction | 2016 |
| Hussain Fibres Ltd | Manufacturing | 2018 |
| HUSSAIN36 (NI) Ltd | Administrative & support | 2017 |
| Hutchinson Cooper Northern Limited | Real estate | 1987 |
| Hutton & Cawood Limited | Professional & scientific | 2000 |
| Hutton and Cawood Building and Joinery Limited | Manufacturing | 2010 |
| HV Engineers Ltd | Manufacturing | 2012 |
| HW Holdings Limited | Financial services | 2015 |
| HX Cine Ltd | Information & communication | 2019 |
| HX Civils Ltd | Construction | 2024 |
| HX Corner Ltd | Wholesale & retail | 2023 |
| HX Developments Ltd | Real estate | 2022 |
| HX Homes Ltd | Real estate | 2018 |
| HX Management Services Ltd | Professional & scientific | 2011 |
| HX Performance Ltd | Wholesale & retail | 2024 |
| HX Properties 1 Ltd | Real estate | 2025 |
| HX Storage Ltd | Transport & logistics | 2024 |
| HX1 Catering Limited | Hospitality | 2025 |
| HX1 Window Supplies Limited | Construction | 2012 |
| HX2 Holdings Limited | Financial services | 2016 |
| HX3 Loaded Limited | Hospitality | 2025 |
| HX3 Property Group Limited | Real estate | 2024 |
| HX5 Displays Ltd | Manufacturing | 2011 |
| HX5 Homes Ltd | Real estate | 2025 |
| HX7 MOT & Repair Center Limited | Wholesale & retail | 2019 |
| Hxhvac Ltd | Construction | 2026 |
| Hxkeys Ltd | Other services | 2025 |
| HXL Mechanical Services Ltd | Construction | 2016 |
| Hydroserve Limited | Water & waste | 2010 |
| Hyflex Ltd | Real estate | 2022 |
| Hygge Hot Tubs Ltd | Households | 2018 |
| HYGIENE2003 Ltd | Health & social care | 2023 |
| Hyline Fabrications Limited | Manufacturing | 2012 |
| Hynivo Ltd | Wholesale & retail | 2023 |
| Hypergrowth Digital Ltd | Professional & scientific | 2025 |
| I 2 I (Yorkshire) Limited | Health & social care | 2006 |
| I Akhtar Legal Limited | Professional & scientific | 2026 |
| I and B Hall Builder and Plasterer Ltd | Construction | 2024 |
| I K Plastics Limited | Construction | 2013 |
| I S Roper Limited | Professional & scientific | 2022 |
| I W K Services Ltd | Transport & logistics | 2026 |
| I.O.U. Limited | Arts & recreation | 1977 |
| I.T.T.I.D. (Trading) Ltd | Health & social care | 1988 |
| I5ERVE Computing Limited | Information & communication | 2007 |
| IAH Medics Ltd | Health & social care | 2017 |
| IAK Healthcare Limited | Health & social care | 2021 |
| IAM Legal Justice Ltd | Professional & scientific | 2025 |
| IAN Birtwell Excavations &Groundworks Ltd | Construction | 2022 |
| IAN Hutchinson Enterprises Limited | Arts & recreation | 2015 |
| IAN Midgley Roofing Ltd | Construction | 2008 |
| IAN Smith Medical Limited | Health & social care | 2010 |
| Ibstock Lathom Ltd | Wholesale & retail | 2025 |
| Ibuild Scaffolding Services Limited | Construction | 2021 |
| Ibuildgroup Ltd | Construction | 2013 |
| Icarus Contract Services Ltd | Transport & logistics | 2019 |
| ICC Detailing Limited | Other services | 2026 |
| Icedbrew Ltd | Manufacturing | 2023 |
| ICL Law Ltd | Professional & scientific | 2016 |
| Icon Industrial Engineering Services Ltd | Professional & scientific | 2025 |
| Icon Lighting Ltd | Wholesale & retail | 2024 |
| Icon Living Limited | Professional & scientific | 2014 |
| Iconic Memorabilia Limited | Wholesale & retail | 2023 |
| ID Bridge Ltd | Information & communication | 2023 |
| Ideal Autolease Limited | Administrative & support | 2003 |
| IES Properties Limited | Construction | 2017 |
| Ifaprosure Limited | Financial services | 2009 |
| Ifix HX Ltd | Wholesale & retail | 2024 |
| IFT Wealth Management Ltd | Financial services | 2010 |
| IG Joiner Limited | Construction | 2023 |
| IG Lettings Ltd | Real estate | 2020 |
| IG Solutions Limited | Information & communication | 2019 |
| Igpr Limited | Wholesale & retail | 2014 |
| IH Property Developments Limited | Construction | 2018 |
| Ihus Limited | Information & communication | 2016 |
| IHY Publishing Limited | Information & communication | 2025 |
| Iisaccs Limited | Construction | 2013 |
| Ijaz Rehman Limited | Health & social care | 2017 |
| IJL Electrical Services Limited | Construction | 2022 |
| Ikonik Visuals Cinematography Studio Ltd | Information & communication | 2019 |
| Ikoy Secretarial Ltd | Administrative & support | 2016 |
| Illyrian 3 Ltd | Hospitality | 2026 |
| Imaad Fast Food Limited | Hospitality | 2023 |
| Imaam-Deen Limited | Construction | 2019 |
| Imara Tamir Ltd | Administrative & support | 2019 |
| Imarah Perfumes Ltd | Manufacturing | 2023 |
| Imhj Property Management Ltd | Real estate | 2024 |
| Immerse Recovery Ltd | Other services | 2023 |
| Immerse Social Club Ltd | Hospitality | 2026 |
| IMP Sports Management and Promotions Ltd | Arts & recreation | 2026 |
| Impact Creative Solutions Ltd | Manufacturing | 2018 |
| Implement Services Ltd | Administrative & support | 2023 |
| Imrati UK Limited | Wholesale & retail | 2024 |