| Hi-Tech Commodities Limited | Transport & logistics | 2005 |
| High-Teens Records Limited | Information & communication | 2009 |
| Highcliffe Engineering Limited | Construction | 1983 |
| Highvalue Care Limited | Health & social care | 2025 |
| Hinchi Studio Ltd | Arts & recreation | 2026 |
| Hipco Ltd | Health & social care | 2014 |
| Hirst Bathroom Renovations Ltd | Construction | 2026 |
| Hirst Cuts Limited | Other services | 2025 |
| HK Pathway Limited | Education | 2026 |
| HKB Food Ltd | Hospitality | 2025 |
| HM Integrity Consultancy Limited | Professional & scientific | 2025 |
| Hodges Construction Ltd | Construction | 2020 |
| Hogton & Holt Homes Ltd | Real estate | 2020 |
| Holloways Property Solutions Limited | Real estate | 2026 |
| Hollywood Nails DN Ltd | Other services | 2023 |
| Holme Joinery Limited | Construction | 2026 |
| Home BOY Services Ltd | Transport & logistics | 2025 |
| Homechoice Loans Ltd | Administrative & support | 2007 |
| Hooton Bingo Limited | Arts & recreation | 2023 |
| Hooton Lodge Events Limited | Arts & recreation | 2019 |
| Hooton Lodge Leisure Limited | Arts & recreation | 2018 |
| Hopwood PHG Ltd. | Construction | 2018 |
| Hot Homes (Yorkshire) Limited | Construction | 2012 |
| Hough Lane Management Company Limited | Households | 2020 |
| Houlbrook Engineering Ltd | Professional & scientific | 2026 |
| House Fixer Ltd | Construction | 2026 |
| HP Smiles Limited | Health & social care | 2025 |
| HRC Investments Ltd | Real estate | 2016 |
| Hughes Water Engineers Limited | Extraterritorial | 2014 |
| Hugo Property Limited | Real estate | 2024 |
| Huma Renewables Limited | Construction | 2025 |
| Humber Specialist Fabricators Limited | Manufacturing | 2003 |
| Hunsley Financial Planning Limited | Financial services | 2014 |
| Hunsley Renovations Limited | Construction | 2018 |
| HVG Limited | Real estate | 2014 |
| Hwjc Properties Ltd | Real estate | 2020 |
| Hydro-Fix Hydraulics Limited | Professional & scientific | 2016 |
| Hydrogen Business Intelligence Limited | Information & communication | 2022 |
| I Kershaw Engineering Services Limited | Manufacturing | 2014 |
| I&Co Cosmetics Limited | Wholesale & retail | 2024 |
| IAM Lettings Ltd | Real estate | 2025 |
| Iamdoors Ltd | Manufacturing | 2017 |
| IAN Allerston Optometry Ltd | Wholesale & retail | 2023 |
| ICD Energy Charging Ltd | Construction | 2019 |
| Ideal Properties Yorkshire Ltd | Real estate | 2024 |
| Ideal Travel Limited | Administrative & support | 1999 |
| IHB Property Limited | Real estate | 2025 |
| Ikpoba Hill Barrack & Mammy Youth Association CIC | Health & social care | 2025 |
| Imams Healthcare Limited | Health & social care | 2011 |
| Imove Logistics Ltd | Other services | 2016 |
| IN the Tank HQ Ltd | Arts & recreation | 2026 |
| Indebuscon Limited | Professional & scientific | 2006 |
| Industrial Ropeworks Ltd | Construction | 2025 |
| Industry-Wide Coal Staff Superannuation Scheme Co-Ordinator Limited | Other services | 1994 |
| Industry-Wide Coal Staff Superannuation Scheme Trustees Limited | Financial services | 1994 |
| Industry-Wide Mineworkers' Pension Scheme Co-Ordinator Limited | Other services | 1994 |
| Industry-Wide Mineworkers' Pension Scheme Trustees Limited | Financial services | 1994 |
| Inspire 2 Empower CIC | Health & social care | 2024 |
| Install Maintain Sustain Ltd | Construction | 2023 |
| Installit (Yorkshire) Limited | Construction | 2025 |
| Insul Properties Limited | Real estate | 2026 |
| Intchems Limited | Professional & scientific | 2019 |
| Intelligent Instructor Limited | Administrative & support | 2015 |
| Intercontinental Chemical Products Limited | Manufacturing | 1993 |
| International Stock Disposal Limited | Administrative & support | 2020 |
| Intra Core Technologies (UK) Ltd | Information & communication | 2023 |
| IQ2SURVEYS Ltd | Professional & scientific | 2025 |
| IVC Capital Ltd | Administrative & support | 2020 |
| J & a K Holdings Ltd | Financial services | 2023 |
| J Ashton Engineering Ltd | Construction | 2026 |
| J Elson Projects Ltd | Professional & scientific | 2021 |
| J Litchfield & Sons Commercial GAS Services Limited | Construction | 2024 |
| J Saunders Property Limited | Real estate | 2025 |
| J T Owen (Yorkshire) Ltd | Construction | 2023 |
| J Turkish Barber Ltd | Other services | 2025 |
| J W Heating and Plumbing Solutions Limited | Construction | 2011 |
| J'S Groundforce Limited | Other services | 2020 |
| J. Anderson & SON Limited | Construction | 2004 |
| J.L.M Fabs Ltd | Manufacturing | 2025 |
| JAC Partnership Limited | Transport & logistics | 2025 |
| Jack in the Box Club Limited | Arts & recreation | 1999 |
| Jackson Seven Limited | Financial services | 2024 |
| Jaeger Precision Limited | Other services | 2024 |
| Jake Uttley Electrical Limited | Energy | 2025 |
| Jakk Developments Limited | Construction | 2014 |
| Jakub Tradings Ltd | Information & communication | 2025 |
| Jama Fade Ltd | Other services | 2025 |
| James Park Homes Limited | Hospitality | 2015 |
| Jamshid Barber Ltd | Other services | 2025 |
| Jans Transport Ltd | Transport & logistics | 2018 |
| Jason Cunningham Boxing Ltd | Arts & recreation | 2021 |
| Jason Ward Just Mortgages Ltd | Financial services | 2021 |
| JB Wealth & Strategy Ltd | Professional & scientific | 2021 |
| Jbackerley Ltd | Health & social care | 2025 |
| JBM Engineering Limited | Manufacturing | 2015 |
| JBM Recycling Limited | Manufacturing | 2018 |
| JC Urban Developments Limited | Real estate | 2025 |
| JD Garden Buildings Limited | Construction | 2022 |
| JDW Buildings Limited | Real estate | 2025 |
| Jebels Group Limited | Real estate | 2022 |