| Infocloud Limited | Information & communication | 2024 |
| Informatics Trading Development (ITD) Ltd | Information & communication | 2012 |
| Information Systems Consultants Ltd. | Wholesale & retail | 2014 |
| Informatrix Consultance Ltd | Information & communication | 2013 |
| Infotech IT Limited | Information & communication | 2024 |
| Infrafuture Limited | Extraterritorial | 2024 |
| Infrared Sauna Spa Childwall Limited | Other services | 2018 |
| Infrared Training Limited | Administrative & support | 2005 |
| Infrastruct North Ltd | Construction | 2023 |
| Infusion Lines User Limited | Health & social care | 2025 |
| Ingenium (Ace) Holdings Ltd | Financial services | 2023 |
| Ingenium (CON ED) Holdings Ltd | Financial services | 2026 |
| Ingenium Group Services Ltd | Information & communication | 2026 |
| Ingenuity Properties Limited | Real estate | 2021 |
| Ingestre Projects Ltd | Construction | 2020 |
| Ingham Management Ltd | Professional & scientific | 2021 |
| Ingleholme Education Services Ltd | Education | 2016 |
| Ingley Limited | Real estate | 1981 |
| Inglismith Ltd | Professional & scientific | 2026 |
| Ingo Interiors Ltd | Professional & scientific | 2014 |
| Ingot Holdings Limited | Financial services | 2018 |
| Ingot Portal Limited | Professional & scientific | 2007 |
| Ingress Communications UK Ltd | Wholesale & retail | 2014 |
| Ingrid Wilkinson Limited | Arts & recreation | 2022 |
| Ingull Limited | Financial services | 2025 |
| Ingy Limited | Other services | 2022 |
| Inhale & Exhale CIC | Other services | 2025 |
| Initiaate Limited | Information & communication | 2019 |
| Initial Advice Ltd | Administrative & support | 2019 |
| Initial Film Sales Ltd | Information & communication | 2019 |
| Initiative Investment Ltd | Real estate | 2024 |
| Initio Interactive Ltd | Administrative & support | 2011 |
| Initio Media UK Ltd | Professional & scientific | 2026 |
| INK & Beauty Ltd | Other services | 2025 |
| INK Bar Events Ltd | Hospitality | 2025 |
| INK Memorabilia Ltd | Wholesale & retail | 2019 |
| INK Sea Limited | Other services | 2026 |
| Inkling Property Limited | Real estate | 2017 |
| Inkside Supplies Limited | Wholesale & retail | 2025 |
| Inkson Engineering Limited | Administrative & support | 2009 |
| Inkson Entertainments Ltd | Arts & recreation | 2026 |
| Inkson Industries Ltd | Financial services | 2026 |
| INM Construct Ltd | Construction | 2019 |
| INM Contractors Ltd | Construction | 2025 |
| Inn Design (NW) Ltd | Construction | 2020 |
| Inner Beauty (NW) Limited | Other services | 2013 |
| Inner Bliss Wellbeing CIC | Health & social care | 2020 |
| Inner Guru CIC | Health & social care | 2020 |
| Inner ME Ltd | Health & social care | 2025 |
| Inner ME Supplements Ltd | Wholesale & retail | 2026 |
| Inner Mind Consulting Ltd | Transport & logistics | 2019 |
| Inner Solutions Life Coaching Ltd | Education | 2015 |
| Inner Work Hypnotherapy Ltd | Health & social care | 2024 |
| Inner Works FM Ltd | Professional & scientific | 2025 |
| Inner World Design & Build Limited | Construction | 1999 |
| Innerbalance Wellbeing & Training Solutions Limited | Health & social care | 2024 |
| Innerimage Property Ltd | Real estate | 2023 |
| Innerverie Limited | Real estate | 2025 |
| Innervision Consultancy Ltd | Professional & scientific | 2020 |
| Innobella Media Limited | Information & communication | 2009 |
| Innocent Foods Ltd | Administrative & support | 2009 |
| Innocents World Support Ltd | Education | 2020 |
| Innogenn Health Care Ltd | Health & social care | 2025 |
| INNOV8TIONS Ltd | Arts & recreation | 2013 |
| Innovaite Solutions Ltd | Information & communication | 2025 |
| Innovate Environmental Services Ltd | Wholesale & retail | 2021 |
| Innovate GAS Solutions Limited | Administrative & support | 2017 |
| Innovate Pave Limited | Construction | 2026 |
| Innovatech Designs Ltd | Information & communication | 2025 |
| Innovatic Business Solutions Ltd | Professional & scientific | 2026 |
| Innovating Education CIC | Administrative & support | 2016 |
| Innovation Design Services Limited | Professional & scientific | 2013 |
| Innovation Properties Northwest Ltd | Real estate | 2024 |
| Innovation Solutions Ltd | Professional & scientific | 2020 |
| Innovation Student Property Ltd | Real estate | 2015 |
| Innovation Textiles and Clothing Ltd | Manufacturing | 2013 |
| Innovation Training and Recruitment Limited | Professional & scientific | 2022 |
| Innovation X Ltd | Information & communication | 2019 |
| Innovative Culinary Concepts Ltd | Other services | 2016 |
| Innovative Design & Manufacturing Limited | Professional & scientific | 2014 |
| Innovative Employment Services Ltd | Administrative & support | 2017 |
| Innovative Equipment Ltd | Wholesale & retail | 2023 |
| Innovative General Practice Collaborative Primary Care Network Ltd | Health & social care | 2021 |
| Innovative Industries Limited | Administrative & support | 2007 |
| Innovative Pension Solutions Ltd | Professional & scientific | 2025 |
| Innovative Road Safety Solutions Ltd | Other services | 2019 |
| Innovative Software Technologies UK Ltd | Information & communication | 2023 |
| Innove Solutions NW Ltd | Information & communication | 2018 |
| Innovex Science Limited | Professional & scientific | 2025 |
| Innox Property Limited | Real estate | 2020 |
| Innsight Services Limited | Health & social care | 2015 |
| Inofinity Ltd | Administrative & support | 2019 |
| Inoks Integrated Services Ltd | Transport & logistics | 2025 |
| Inoventra Limited | Information & communication | 2025 |
| INS Travel Limited | Administrative & support | 2021 |
| Insane Interiors Limited | Other services | 2019 |
| Insero Investments Ltd | Financial services | 2024 |
| Insero Media Ltd | Professional & scientific | 2019 |
| Inside Connections App Limited | Information & communication | 2019 |
| Inside Connections Group Limited | Financial services | 2019 |