| Hydrotek Group Limited | Water & waste | 2025 |
| Hygiene Ltd | Administrative & support | 2019 |
| Hynovia Ltd | Administrative & support | 2025 |
| Hyperion Business Consulting Ltd | Professional & scientific | 2026 |
| I AM Recycling Limited | Manufacturing | 2025 |
| I Care Service Providers Ltd | Health & social care | 2024 |
| I Wear (Cheshire) Ltd | Professional & scientific | 2016 |
| I.C Mobile Tyres Ltd | Transport & logistics | 2025 |
| I.D Clothing Ltd | Wholesale & retail | 2024 |
| IA Modest Wear Limited | Wholesale & retail | 2025 |
| IA Production Ltd | Administrative & support | 2025 |
| IAN Pearson Consulting Limited | Professional & scientific | 2007 |
| Ice Digital Marketing Ltd | Professional & scientific | 2010 |
| Icratec (U.K.) Limited | Information & communication | 2002 |
| Ideas JAR Limited | Extraterritorial | 2004 |
| Idle Work Factory Ltd | Information & communication | 2023 |
| IF I GET Stuck Limited | Education | 2014 |
| IFA Consultants Limited | Financial services | 2008 |
| IFD Tech Ltd | Information & communication | 2024 |
| Ifra M Ltd | Health & social care | 2020 |
| Igen Trust | Education | 2008 |
| IK Oankar Property Ltd | Real estate | 2026 |
| IL Pirata Pizzata Limited | Hospitality | 2020 |
| Ilkley Properties Ltd | Construction | 2023 |
| ILS Property Developments Ltd | Construction | 2016 |
| IM Mortgage Solutions Limited | Financial services | 2025 |
| Imaan Consulting Limited | Professional & scientific | 2024 |
| Image Optical Limited | Professional & scientific | 2012 |
| IMF Global Limited | Wholesale & retail | 2020 |
| Improvisia Limited | Professional & scientific | 2003 |
| Incommunities Treasury PLC | Financial services | 2018 |
| Independent Foster Carers Alliance Ltd | Other services | 2019 |
| Independent Surveyors Ltd | Professional & scientific | 2003 |
| Infinity Plastic Solutions Limited | Administrative & support | 2025 |
| Information Designs Limited | Financial services | 2015 |
| Inib Ltd | Health & social care | 2025 |
| INK Original Limited | Wholesale & retail | 2016 |
| Innapub Ltd | Hospitality | 2019 |
| Innes Fabrication Services Limited | Manufacturing | 2019 |
| Innovate (North) Limited | Professional & scientific | 2009 |
| Insight Best Practice Limited | Professional & scientific | 2010 |
| Insight Supps Ltd | Wholesale & retail | 2018 |
| Inspexx Ltd | Professional & scientific | 1998 |
| Inspired Solutions Consultancy Limited | Administrative & support | 2015 |
| Intact Builders & Maintenance Ltd | Construction | 2021 |
| International Moisture Analysers (Holdings) Limited | Financial services | 2017 |
| International Moisture Analysers Limited | Manufacturing | 1995 |
| International Rubber & Tyre Recycling Limited | Professional & scientific | 2011 |
| Intu Design & Build Limited | Construction | 2018 |
| Intu Developments Limited | Construction | 2018 |
| Invest 4 Rainy Dayz Limited | Real estate | 2019 |
| Invictus Developments Yorkshire Ltd | Construction | 2016 |
| Iridium Talent Limited | Administrative & support | 2024 |
| Iron Octopus Limited | Manufacturing | 2015 |
| Ironstone Cottages Limited | Hospitality | 2019 |
| Irregular Arts | Arts & recreation | 2014 |
| Irtr Environmental Services Limited | Professional & scientific | 2011 |
| Isamed Limited | Health & social care | 2014 |
| Ishop Security Ltd | Extraterritorial | 2014 |
| Islambradford | Education | 2012 |
| Issan Ltd | Professional & scientific | 2024 |
| Issy Innovations Ltd | Wholesale & retail | 2018 |
| IT Blackbelt Ltd | Wholesale & retail | 2026 |
| IT Change Delivery Limited | Information & communication | 2024 |
| Izen DD Labs UK Ltd | Health & social care | 2025 |
| J & G Developments Yorkshire Ltd | Construction | 2016 |
| J & L Chemicals Ltd | Wholesale & retail | 2014 |
| J a Fabrications Limited | Manufacturing | 2024 |
| J and P Nall Ltd | Professional & scientific | 2018 |
| J Brannan Engineering Limited | Manufacturing | 2019 |
| J Christensen Plumbing & Heating Limited | Construction | 2019 |
| J D Sales and Marketing Limited | Administrative & support | 2018 |
| J K Lost Stars Limited | Health & social care | 2018 |
| J M Developments (Bradford) Limited | Construction | 2013 |
| J R Autocare Limited | Wholesale & retail | 2013 |
| J. Campbell Limited | Wholesale & retail | 2023 |
| J. Meredith Electrical Contractors Ltd | Construction | 2018 |
| J.Clark & Co Ltd. | Manufacturing | 1996 |
| J.W. Stead & SON Limited | Manufacturing | 1976 |
| Jabs Technical Solutions Limited | Administrative & support | 2022 |
| Jacksons Coatings Limited | Manufacturing | 2004 |
| Jacoo Limited | Manufacturing | 2020 |
| Jacuzzi Suits Limited | Hospitality | 2025 |
| Jagger (Holdings) Limited | Financial services | 2019 |
| Jahangir Travels Ltd | Transport & logistics | 2023 |
| JAK Trading Ltd | Health & social care | 2017 |
| James Gledhill Agencies Ltd | Wholesale & retail | 2015 |
| James Kitching Builders Ltd | Construction | 2026 |
| James MAE Automation Limited | Administrative & support | 2017 |
| James MAE Construction Limited | Professional & scientific | 2016 |
| James MAE Group Limited | Financial services | 2019 |
| James MAE Industries Limited | Manufacturing | 2016 |
| James MAE Projects Limited | Professional & scientific | 2014 |
| James MAE Properties Limited | Real estate | 2016 |
| James MAE Renewables Limited | Construction | 2025 |
| Jamia Shan-E-Islam Welfare and Educational Centre Ltd | Other services | 2026 |
| JAY Russell Ltd | Information & communication | 2025 |
| JAYBEE74 Limited | Professional & scientific | 2021 |
| JB Storage Solutions Ltd | Transport & logistics | 2023 |
| JB Valeting Centre Limited | Administrative & support | 2025 |