| Icons-Stylinghair Limited | Other services | 2016 |
| Icontest Ltd | Education | 2023 |
| ICR Home Ltd | Real estate | 2019 |
| ICR Properties Ltd | Real estate | 2024 |
| Idan Vibes Ltd | Manufacturing | 2024 |
| Ideal - Standard Limited | Professional & scientific | 1954 |
| Ideal Bodyworx Ltd | Wholesale & retail | 2014 |
| Ideal Boiler Installation Ltd | Construction | 2019 |
| Ideal Boilers Limited | Manufacturing | 1936 |
| Ideal Brands (UK) Limited | Real estate | 2003 |
| Ideal Centre Hull Limited | Education | 2021 |
| Ideal Electrical Solutions (Hull) Ltd | Construction | 2015 |
| Ideal Financial Advice Limited | Financial services | 2013 |
| Ideal Garden Rooms Limited | Manufacturing | 2024 |
| Ideal Motorcycle Training Ltd | Education | 2022 |
| Ideal Motorworx Ltd | Wholesale & retail | 2024 |
| Ideal Services Hull Limited | Construction | 2023 |
| Ideal Standard (UK) Limited | Wholesale & retail | 1907 |
| Ideal Standard AS Limited | Administrative & support | 1912 |
| Ideal Standard Holdings (BC) UK Ltd | Professional & scientific | 2007 |
| Ideal Wheels Ltd | Wholesale & retail | 2019 |
| Identikit Limited | Wholesale & retail | 2002 |
| Identity Security Solutions Ltd | Information & communication | 2025 |
| Ideologic Limited | Information & communication | 2012 |
| Idris (Hull) Limited | Wholesale & retail | 2019 |
| Idyllic Escapes Limited | Hospitality | 2023 |
| IED-K9 Training & Consultancy Ltd | Administrative & support | 2024 |
| Iemploy Ltd | Administrative & support | 2011 |
| Ifeluxe Compassionate Healthcare Ltd | Health & social care | 2026 |
| Iformulate Ltd | Professional & scientific | 2012 |
| Iguana Developments Limited | Construction | 2015 |
| Ih&Kf Ltd | Real estate | 2023 |
| Ihatch-Apps Ltd | Information & communication | 2018 |
| Ihelios Living Reinvented Ltd | Manufacturing | 2022 |
| Ihsan Trading Group Ltd | Information & communication | 2025 |
| Iiihealthcare Ltd | Wholesale & retail | 2025 |
| IKD Inspection & Verification Services Ltd | Professional & scientific | 2022 |
| Ikram&Nusrat Limited | Real estate | 2024 |
| IL Cane Nero Company Ltd | Construction | 2011 |
| Ileg Financial Limited | Administrative & support | 2014 |
| Ilex Replanted Forestry Limited | Agriculture & fishing | 1998 |
| Ilgus Ltd | Hospitality | 2025 |
| Ilid Limited | Information & communication | 2025 |
| Iligma Limited | Wholesale & retail | 2021 |
| Illingworth & Gregory (Holdings) Limited | Professional & scientific | 1989 |
| Illingworth & Gregory Limited | Construction | 1976 |
| Illoomed Limited | Wholesale & retail | 2015 |
| Illusions Nails and Beauty Limited | Other services | 2015 |
| Illustrativelearn Limited | Professional & scientific | 2024 |
| Ilyas Barbers 1 Ltd | Other services | 2024 |
| Image Marmaris Limited | Other services | 2015 |
| Image Windows (East Yorkshire) Limited | Construction | 2004 |
| Imagexps Limited | Manufacturing | 1986 |
| Imaginary Capital Limited | Information & communication | 2025 |
| Imagine Housing CIC | Hospitality | 2020 |
| Imagnu Ltd | Hospitality | 2015 |
| IMG Build Ltd | Manufacturing | 2025 |
| Immingham Truck and Trailer Commercial Services Ltd | Wholesale & retail | 2024 |
| Impact Community CIC | Hospitality | 2025 |
| Impact Dancewear Ltd | Wholesale & retail | 2016 |
| Impact Refinishers Limited | Wholesale & retail | 1998 |
| Impact Social Value Reporting Ltd | Information & communication | 2018 |
| Impala Properties Ltd | Real estate | 2024 |
| Imperial Van Glass Limited | Wholesale & retail | 2019 |
| Imperium Flooring Limited | Manufacturing | 2021 |
| Imperium Media Ltd | Manufacturing | 2024 |
| IMPRESSION11 Limited | Information & communication | 2011 |
| Imstech Ltd | Extraterritorial | 2010 |
| IMV Packaging Limited | Manufacturing | 2009 |
| IMV Transport Logistic Ltd | Transport & logistics | 2025 |
| Inaayan Holdings Limited | Wholesale & retail | 2025 |
| Inaayan UK Limited | Real estate | 2025 |
| Inamik Ltd | Extraterritorial | 2018 |
| Incaudo Software House Ltd | Information & communication | 2026 |
| Incognito Network Ltd | Professional & scientific | 2024 |
| Income Ltd | Construction | 2025 |
| Independence (Hedon) Limited | Other services | 2004 |
| Independent Cleaning Services Limited | Administrative & support | 1995 |
| Independent MOT Limited | Wholesale & retail | 2004 |
| Independent MOT Testing (Hull) Limited | Wholesale & retail | 2022 |
| Independent Steel Fabrications Ltd. | Manufacturing | 2014 |
| India Spice 23 Limited | Hospitality | 2023 |
| Indian & Continental Stores Limited | Wholesale & retail | 2025 |
| Indian Queens Power Limited | Energy | 1994 |
| Indigo Blue Holdings Limited | Financial services | 2022 |
| Individual Modular Installations Limited | Wholesale & retail | 2007 |
| Indivior EU Limited | Manufacturing | 2012 |
| Indivior Global Holdings Limited | Financial services | 2015 |
| Indivior Limited | Financial services | 2014 |
| Indivior UK Finance NO 1 Limited | Financial services | 2020 |
| Indivior UK Finance NO 2 Limited | Financial services | 2020 |
| Indivior UK Finance NO 3 Limited | Financial services | 2020 |
| Indivior UK Limited | Manufacturing | 2010 |
| Indo Bangla Corporation Ltd | Hospitality | 2024 |
| Indra Consulting Limited | Information & communication | 2007 |
| Industria Macchina Limited | Hospitality | 2018 |
| Industrial Filter Services (UK) Limited | Manufacturing | 2013 |
| Industrial Filter Services Limited | Manufacturing | 2005 |
| Industrial Filtration Services (UK) Limited | Manufacturing | 2026 |
| Industrial Paint Supplies (Hull) Limited | Wholesale & retail | 2016 |