| Integral Structural Steelwork Ltd | Manufacturing | 2026 |
| Integrative Pet Care Limited | Professional & scientific | 2022 |
| Integrum Business Solutions Ltd | Information & communication | 2018 |
| Intelecore Ltd | Wholesale & retail | 2025 |
| Intelectual Marketing Limited | Wholesale & retail | 2023 |
| Inteliqo Enterprises Limited | Wholesale & retail | 2020 |
| Intelligent Diesel Systems Limited | Professional & scientific | 2003 |
| Intelligent Solutions International Limited | Wholesale & retail | 2025 |
| Intelligent Technologies and Solutions Ltd | Information & communication | 2026 |
| Intellimon Limited | Information & communication | 2001 |
| Intellivapes Ltd | Wholesale & retail | 2013 |
| Inter Force Trading Ltd | Information & communication | 2018 |
| Inter Road Systems Ltd | Construction | 2024 |
| Inter-Diversity Limited | Education | 2015 |
| Inter-Facilities Management Ltd | Construction | 2018 |
| Intercity Cars Ltd | Transport & logistics | 2025 |
| Intercity Holidays Ltd | Administrative & support | 2026 |
| Intercity Laundry Limited | Other services | 2025 |
| Intercultured Festival C.I.C. | Arts & recreation | 2021 |
| Interior Direct Ltd | Manufacturing | 2019 |
| Interior Form Design and Installation Ltd | Professional & scientific | 2025 |
| Interior Form Installations Ltd | Construction | 2018 |
| Interior Source Limited | Wholesale & retail | 2025 |
| Interloop Global Limited | Wholesale & retail | 2023 |
| Intermesh Creative Limited | Manufacturing | 2011 |
| Internal Wing Chun Academy Ltd | Arts & recreation | 2022 |
| International Breakdown Limited | Other services | 2000 |
| International City Cargo Services Ltd | Transport & logistics | 2017 |
| International Education Services Ltd | Education | 2022 |
| International Educational Development Limited | Education | 2019 |
| International Flagship Limited | Hospitality | 2023 |
| International Mixed Ability Sports C.I.C. | Education | 2014 |
| International Riding Company Limited | Wholesale & retail | 2013 |
| International Scientific Supplies Limited | Manufacturing | 2002 |
| International Seafoods Limited | Manufacturing | 2011 |
| International Support Foundation Limited | Health & social care | 2014 |
| Internet Lounge Ltd | Other services | 2021 |
| Interspace Music Ltd | Arts & recreation | 2023 |
| Intervention Motor Company Limited | Wholesale & retail | 2025 |
| Interworx Northern Ltd | Construction | 2019 |
| Intimate Treasures Ltd | Wholesale & retail | 2025 |
| Into the Temple Limited | Other services | 2020 |
| Intouch Cafe/Diner Ltd | Hospitality | 2018 |
| Intra Trax Limited | Wholesale & retail | 2026 |
| Intradistant Ltd | Administrative & support | 2018 |
| INVENTORY-4U Ltd | Wholesale & retail | 2020 |
| Inver Court Ltd | Real estate | 2025 |
| Invest Profile Ltd | Real estate | 2021 |
| Investahive Limited | Real estate | 2023 |
| Investico Bradford Ltd | Real estate | 2025 |
| Invictus Sales & Marketing Limited | Wholesale & retail | 2024 |
| Invisi Track UK Ltd | Wholesale & retail | 2026 |
| Invisible Light Ltd | Information & communication | 2016 |
| Invoicefree UK Ltd | Information & communication | 2025 |
| Invory Solutions Point Limited | Administrative & support | 2021 |
| IO Supplies Ltd | Wholesale & retail | 2024 |
| Ioannis Optical Services Ltd | Health & social care | 2025 |
| Ionel’S Transport Ltd | Transport & logistics | 2019 |
| Ionit North Ltd | Health & social care | 2026 |
| Ionut Trans Ltd | Transport & logistics | 2015 |
| Iorio Solutions Limited | Construction | 2019 |
| IOT Routers Limited | Professional & scientific | 2015 |
| IOX Robotics Ltd | Professional & scientific | 2020 |
| Ipearls Limited | Professional & scientific | 2017 |
| Iphendi Ltd | Arts & recreation | 2019 |
| Iphone Centre Limited | Wholesale & retail | 2017 |
| Iproducts Nationwide Ltd | Wholesale & retail | 2017 |
| Ipts Hub Ltd | Wholesale & retail | 2022 |
| IQ & Sons Building Contractors Ltd | Construction | 2023 |
| IQ Builders Yorkshire Ltd | Other services | 2023 |
| IQ Labels & Packaging Ltd | Manufacturing | 2024 |
| IQ Nest Ltd | Wholesale & retail | 2025 |
| IQ Plus Security Ltd | Financial services | 2025 |
| IQ Property Yorkshire Ltd | Real estate | 2025 |
| IQ Sleep Solutions Ltd | Wholesale & retail | 2026 |
| IQ Surveyors Ltd | Professional & scientific | 2025 |
| Iqbal Catering Services Ltd | Hospitality | 2019 |
| Iqbal Choudhury Ltd | Wholesale & retail | 2021 |
| Iqbal Groceries Ltd | Wholesale & retail | 2023 |
| Iqbal Investment Properties Ltd | Real estate | 2024 |
| Iqbal Mots Ltd | Wholesale & retail | 2020 |
| Iqbal Singh Sekhon Limited | Real estate | 2021 |
| Iqbal’S Curry House Limited | Hospitality | 2025 |
| IQI Industries Ltd | Real estate | 2004 |
| IQQ Centre Ltd | Education | 2016 |
| Iqra Educational & Welfare Trust Ltd | Education | 2009 |
| IQS Consultants Ltd | Financial services | 2017 |
| Irca.Uk Ltd | Professional & scientific | 2025 |
| Irfa Digital Limited | Information & communication | 2021 |
| Irima’S Marketplace Limited | Wholesale & retail | 2025 |
| Irish Mutsa Care UK Ltd | Health & social care | 2023 |
| Iristani Properties Ltd | Real estate | 2024 |
| IRL 123 Ltd | Transport & logistics | 2025 |
| Irlam Service Station Ltd | Wholesale & retail | 2015 |
| Irm-Group Ltd | Water & waste | 2024 |
| Iron Time Gym Ltd | Arts & recreation | 2022 |
| Ironclad Fabrication & Maintenance Solutions Limited | Manufacturing | 2022 |
| Ironman Leeds Limited | Water & waste | 2022 |
| Ironmongery Express (UK) Ltd | Wholesale & retail | 2013 |
| Ironveil Protections Limited | Administrative & support | 2026 |