| Hyde Diecasting Ltd. | Manufacturing | 2001 |
| Hyde Flooring Company Limited | Construction | 1971 |
| Hydro Cleanse Ltd | Construction | 2023 |
| Hyper Civils Ltd | Construction | 2026 |
| Iain Clements Ltd | Information & communication | 2012 |
| Iain Home Consulting Limited | Professional & scientific | 2018 |
| Iain Hunt Consultancy Ltd | Professional & scientific | 2021 |
| IAN Bland Ltd | Administrative & support | 2012 |
| Ibizaclubland Ltd | Information & communication | 2023 |
| Icon Kitchen Contracts Limited | Extraterritorial | 2016 |
| Icon Kitchen Studio Limited | Wholesale & retail | 2015 |
| Icon Studio Limited | Extraterritorial | 2023 |
| Ideal Home Away Limited | Hospitality | 2025 |
| Ideal Investment Group Ltd | Real estate | 2018 |
| Ifalconi Consultants Ltd. | Construction | 2018 |
| IG Hydraulics Ltd | Manufacturing | 2023 |
| Igni-Uk Limited | Public administration | 2020 |
| Ignition CBS Limited | Professional & scientific | 2001 |
| Ijbmachineservices Ltd | Professional & scientific | 2023 |
| Images PLN Limited | Other services | 2018 |
| IMI Deals Ltd | Wholesale & retail | 2024 |
| IMT Consulting Services Limited | Professional & scientific | 2016 |
| IN the BAG Bagels Ltd | Hospitality | 2024 |
| IN2 Build and Design Ltd | Construction | 2014 |
| IN2 Group Holdings Ltd | Other services | 2024 |
| Inclusively Hired Ltd | Administrative & support | 2020 |
| India 2 U Limited | Hospitality | 2013 |
| Indian Kitchen Curry House Ltd | Hospitality | 2024 |
| Industrial Grounds Maintenance UK Limited | Professional & scientific | 2004 |
| INK and Soul C.I.C. | Education | 2025 |
| Inkpharm Ltd | Administrative & support | 2025 |
| Innerbyte Solutions Ltd | Information & communication | 2012 |
| Innovate Leadership Consultancy Limited | Professional & scientific | 2018 |
| Innovatetech Services Limited | Information & communication | 2025 |
| Innovative Nail Kreations Ltd | Wholesale & retail | 2013 |
| Insoles Direct Limited | Wholesale & retail | 2023 |
| Inspire Learning Centre Ltd | Education | 2011 |
| Inspire Physics Ltd | Manufacturing | 2024 |
| Installhq Ltd | Construction | 2022 |
| Insullite Limited | Construction | 2012 |
| Integrate Independence Limited | Administrative & support | 2025 |
| Intelligent Process Control Limited | Manufacturing | 2011 |
| Intelligent Project Management Control Limited | Other services | 2015 |
| Intelligent Search Limited | Administrative & support | 2008 |
| Intelligent Technical Control Limited | Other services | 2018 |
| Inter-Cover (E.Hampson) Limited | Wholesale & retail | 2000 |
| Interfloor Group Limited | Professional & scientific | 2005 |
| Interfloor Limited | Manufacturing | 1920 |
| Interfloor Operations Limited | Professional & scientific | 2005 |
| Intermatrix Limited | Information & communication | 2017 |
| International Boxing Kickboxing Organisation Ltd | Education | 2020 |
| International Foods Store 1 Limited | Wholesale & retail | 2025 |
| Introcrown Limited | Extraterritorial | 1989 |
| Intu Campers Limited | Manufacturing | 2025 |
| Investment Property Traders Limited | Professional & scientific | 2003 |
| IOT Sync Limited | Information & communication | 2023 |
| IP FOX Ltd | Professional & scientific | 2020 |
| IPH Electrical Limited | Construction | 2014 |
| IPH Fire Solutions Limited | Construction | 2014 |
| Irza Limited | Real estate | 2026 |
| Irza Property Limited | Real estate | 2024 |
| Isabakes Ltd | Wholesale & retail | 2020 |
| Islam Logistics Ltd | Transport & logistics | 2025 |
| Istanbul Rossendale Ltd | Other services | 2025 |
| Italian Haslingden Limited | Hospitality | 2023 |
| ITS Slime for FUN Ltd | Health & social care | 2022 |
| IVY Housebuilders Limited | Real estate | 2025 |
| Izzibuyer Limited | Extraterritorial | 2008 |
| Izzyy Pamper Lounge Ltd | Other services | 2025 |
| Izzyy Village Shop Ltd | Wholesale & retail | 2023 |
| J & J Design Ltd | Construction | 1998 |
| J & J Fire Engineering Limited | Construction | 2023 |
| J & J Groundwork ( Rossendale ) Ltd | Construction | 2021 |
| J & T Winter Group Limited | Construction | 2021 |
| J and E Engineering Services Ltd | Professional & scientific | 2025 |
| J Hartley Properties Ltd | Real estate | 2023 |
| J Holgate Brown Ltd | Wholesale & retail | 2025 |
| J Jackson Plumbing & Heating Ltd | Construction | 2024 |
| J Kempson Associates Limited | Financial services | 2013 |
| J Noon Properties Ltd | Real estate | 2024 |
| J Phillips Limited | Other services | 2003 |
| J&L Fire Protection Ltd | Construction | 2026 |
| J.A. Taylor Car Sales (Rossendale) Limited | Wholesale & retail | 1978 |
| J.E Plumbing & Bathrooms Ltd | Construction | 2022 |
| J.H Auto Installation Ltd | Construction | 2024 |
| J.S Joinery&Carpentry Ltd | Construction | 2023 |
| Ja-Karpets Limited | Construction | 2020 |
| Jach Ltd | Wholesale & retail | 2026 |
| Jack Consultancy Ltd | Professional & scientific | 2024 |
| JAD Property Development Limited | Extraterritorial | 2024 |
| JAG Group (NW) Ltd | Construction | 2019 |
| Jake Drive Ltd | Transport & logistics | 2025 |
| JAM Storage Installations Ltd | Construction | 2022 |
| James E.France & Company Limited | Construction | 1961 |
| James Trickett & SON (Independent Consultancy) Limited | Financial services | 1994 |
| James Trickett & SON (Insurances) Limited | Financial services | 1957 |
| Jamie Stansfield Joinery Limited | Construction | 2017 |
| Jane Edwards Limited | Real estate | 2007 |
| JAS Extractions Ltd | Professional & scientific | 2023 |
| Jasmine House Rossendale Ltd | Hospitality | 2023 |