| Igoe Property & Maintenance Ltd | Construction | 2018 |
| IGS Heating & Bathrooms Ltd | Construction | 2026 |
| IJ Social Care Limited | Health & social care | 2022 |
| IJ2P Limited | Real estate | 2012 |
| IJH Properties Limited | Real estate | 2022 |
| IJH Travel Limited | Administrative & support | 2022 |
| IL Technical Design Ltd | Construction | 2019 |
| Ilets LPM Ltd | Real estate | 2013 |
| ILO Create Limited | Professional & scientific | 2006 |
| IM Hurley Management & Consulting Ltd | Transport & logistics | 2012 |
| Imagined Idea Limited | Information & communication | 2024 |
| Imagineit Solutions Ltd | Information & communication | 2012 |
| Imapm Consultancy Ltd | Professional & scientific | 2015 |
| IMC Marine Services Ltd | Professional & scientific | 2023 |
| Immundiagnostik Limited | Extraterritorial | 2021 |
| Impact Education Cheshire Limited | Education | 2022 |
| Impact Management Consultancy Limited | Professional & scientific | 2019 |
| Impact Monitor Limited | Information & communication | 2020 |
| Impact North West Enterprise CIC | Education | 2020 |
| Impact North West Ltd | Education | 2019 |
| Impactgain Limited | Information & communication | 2020 |
| Impression Massage & Advanced Beauty Therapies Ltd | Other services | 2025 |
| Improve IT Commercial Ltd | Construction | 2019 |
| Imren Catering Ltd | Hospitality | 2021 |
| Imrz Labs Limited | Wholesale & retail | 2018 |
| IN a House Limited | Real estate | 2017 |
| IN the Loop Group Ltd | Administrative & support | 2023 |
| Inaddition Ltd | Professional & scientific | 2018 |
| Inchbroom Estates Ltd | Real estate | 2016 |
| Incline Mechanical Services Ltd | Construction | 2024 |
| Incubabies | Other services | 2017 |
| Indess Group Ltd | Administrative & support | 2025 |
| Indie Hacker Limited | Extraterritorial | 2024 |
| Indiecell Ltd | Information & communication | 2015 |
| Indigo Home & Gift Ltd. | Wholesale & retail | 2026 |
| Indigo Lion Ltd | Information & communication | 2009 |
| Indirect Investments Limited | Administrative & support | 2020 |
| Industrial Construction Limited | Construction | 2021 |
| Industry Talent Limited | Professional & scientific | 2025 |
| Inferno Vape Limited | Wholesale & retail | 2023 |
| Infinity APE Ltd | Manufacturing | 2021 |
| Influence Rigging Ltd | Administrative & support | 2017 |
| Ingen Rooms Ltd | Arts & recreation | 2023 |
| Inglewood Technical Services Limited | Information & communication | 2018 |
| Inglés CON Matt Ltd | Education | 2022 |
| Inheritance Protection Services Ltd | Professional & scientific | 2020 |
| Inheritance Tax Solutions Limited | Administrative & support | 2003 |
| Inhouse Commodity Consulting Ltd | Financial services | 2018 |
| Inline Projects Ltd | Construction | 2024 |
| INN2 Ltd | Other services | 2012 |
| Inner Gorilla Ltd | Wholesale & retail | 2022 |
| Inner Sanctuary CIC | Health & social care | 2024 |
| Innocell Limited | Construction | 2015 |
| Innosolutions Limited | Professional & scientific | 2021 |
| INNOV8 Signs Ltd | Manufacturing | 2020 |
| INNOVATE81 Ltd | Wholesale & retail | 2025 |
| Innovative Lighting Solutions Limited | Wholesale & retail | 2009 |
| Innovipharm Ltd | Professional & scientific | 2014 |
| Inochi Homes Ltd | Construction | 2024 |
| Inoh People Recruitment Ltd | Administrative & support | 2024 |
| Inquiro Intelligence Limited | Administrative & support | 2025 |
| INS Acoustics Limited | Other services | 2019 |
| Inside OUT Fires Limited | Wholesale & retail | 2012 |
| Insights Children's Services Ltd | Health & social care | 2015 |
| Insomnia Technology Ltd | Information & communication | 2016 |
| Inspiras Move Ltd | Other services | 2022 |
| Inspirations Wholesale Limited | Wholesale & retail | 1996 |
| Inspire Instructor Training Ltd | Education | 2023 |
| Inspired Bathrooms & Kitchens Ltd | Wholesale & retail | 2013 |
| Inspired Landscaping Limited | Administrative & support | 2023 |
| Inspiring Construction Ltd | Manufacturing | 2024 |
| Inspiring Minds Group CIC | Wholesale & retail | 2023 |
| Install, Service, Maintenance Ltd | Construction | 2018 |
| Insthea Limited | Information & communication | 2020 |
| Instratagem Property Limited | Construction | 2024 |
| Integra Management Consulting Ltd | Professional & scientific | 2026 |
| Integrated Digital Services Limited | Information & communication | 1995 |
| Integrated Food Solutions Limited | Professional & scientific | 2016 |
| Integrated Risk Solutions Limited | Professional & scientific | 2024 |
| Integrity Medical and Health Ltd | Health & social care | 2023 |
| Intelligent Care Solutions Ltd | Professional & scientific | 2014 |
| Intellube Ltd | Professional & scientific | 2019 |
| Interaction Northwest Ltd | Professional & scientific | 2019 |
| Interdisciplinary Applications on Silicon Ltd | Professional & scientific | 2021 |
| Interior AM Ltd | Professional & scientific | 2020 |
| Interiors by SB Ltd. | Wholesale & retail | 2017 |
| Interlec Services Limited | Construction | 2019 |
| International Fire Solutions Limited | Administrative & support | 2010 |
| International Health Consulting Services Ltd | Professional & scientific | 2015 |
| Intertalk Therapy Ltd | Health & social care | 2023 |
| Interworld Systems Ltd | Information & communication | 2007 |
| Intrepid Training Wirral Ltd | Arts & recreation | 2018 |
| Invest in Britain Ltd | Real estate | 2019 |
| Investment and Trade Capability Ltd | Professional & scientific | 2022 |
| Investverte Ltd | Information & communication | 2020 |
| Invictus V Ltd | Administrative & support | 2009 |
| Invisible Music Promotions Ltd | Arts & recreation | 2020 |
| INVITATION2MURDER Ltd | Arts & recreation | 2023 |
| Ioanna Vasilopoulou Limited | Administrative & support | 2019 |
| Ipol Ltd | Administrative & support | 2021 |