| Inka Home Ltd | Wholesale & retail | 2026 |
| Inkcave Limited | Other services | 2023 |
| Inkdot Print Limited | Manufacturing | 2017 |
| Inkeyinc Ltd | Construction | 2020 |
| Inkfish Tattoo Limited | Other services | 2008 |
| Inline Health Limited | Health & social care | 2015 |
| Inline Track Training Limited | Other services | 2002 |
| Inline Track Welding Limited | Construction | 1991 |
| Inme Ltd | Wholesale & retail | 2018 |
| Inn the Wood Ltd | Hospitality | 2018 |
| Inner Sense Nutrition Ltd | Health & social care | 2022 |
| Innerchoice Limited | Other services | 1974 |
| Innovare Design Limited | Construction | 2006 |
| Innovare Design Retail Consultants Ltd | Extraterritorial | 2017 |
| Innovation Construction Limited | Construction | 2009 |
| Innovation for Life Limited | Health & social care | 2025 |
| Innovation World Limited | Information & communication | 2016 |
| Innovative Demolation Ltd | Construction | 2021 |
| Innovative Electrical Supplies Ltd | Wholesale & retail | 2024 |
| Innovative Engineering Solutions SL Limited | Manufacturing | 2019 |
| Innovative Investment & Industrial Supplies Limited | Administrative & support | 2004 |
| Innovolt Electrical Group Ltd | Construction | 2024 |
| Innox Waste and Recycling Limited | Water & waste | 2020 |
| Inospeed Limited | Information & communication | 2022 |
| Inovex-Performance Ltd | Administrative & support | 2020 |
| Inpigritas LLP | | 2021 |
| Inpulsa Tuning Ltd | Wholesale & retail | 2022 |
| Inreach Support Services Ltd | Health & social care | 2025 |
| Insanity Samples Ltd | Information & communication | 2025 |
| Inscope Select Limited | Information & communication | 2025 |
| Inside 360 Ltd | Construction | 2026 |
| Insight Air Conditioning Limited | Energy | 2021 |
| Insight Consulting and Management Ltd | Professional & scientific | 2006 |
| Insight Select Limited | Administrative & support | 2020 |
| Insight Surveying Solutions Ltd | Administrative & support | 2015 |
| Insight Teaching & Learning Ltd | Education | 2026 |
| Insightmed Limited | Arts & recreation | 2021 |
| Insigne Consultancy Ltd | Manufacturing | 2015 |
| Inspiration Capital Developments Ltd | Construction | 2017 |
| Inspirational Change Therapies Limited | Health & social care | 2016 |
| Inspire Asset Finance Limited | Financial services | 2004 |
| Inspire London Ltd | Other services | 2011 |
| Inspire ME Equestrian Limited | Arts & recreation | 2017 |
| Inspire Sport Football Academy Ltd | Arts & recreation | 2026 |
| Inspire Support Workers Limited | Health & social care | 2016 |
| Inspired Vision Group Ltd | Real estate | 2025 |
| Install Digital Ltd | Information & communication | 2023 |
| Installations-Uk Limited | Construction | 2017 |
| Instinct Accounting Ltd | Professional & scientific | 2023 |
| Institute of Islamic Strategic & Socio-Political Affairs | Public administration | 2012 |
| Instyle Spaces Limited | Construction | 2004 |
| Intake 18 QGE Ltd | Other services | 2025 |
| Intamotorcycle Services Limited | Wholesale & retail | 1996 |
| Intapharm Laboratories Limited | Manufacturing | 2017 |
| Intcore Ltd | Administrative & support | 2022 |
| Intec Heating and Mechanical Services Limited | Construction | 2010 |
| Intec Select Limited | Administrative & support | 2016 |
| Integral Financial Advice Limited | Financial services | 2007 |
| Integral Hair Solutions Limited | Other services | 2004 |
| Integrated Scheduling Solutions Limited | Administrative & support | 2007 |
| Intelled Solutions Limited | Hospitality | 2017 |
| Intelligent Facility Services Limited | Administrative & support | 2017 |
| Intelligent Interiors Limited | Construction | 2001 |
| Intelligent Linking Consulting Ltd | Professional & scientific | 2010 |
| Intelligent Plant Hire Ltd | Administrative & support | 2022 |
| Inteltrans Ltd | Transport & logistics | 2018 |
| Interactive Group Ltd | Professional & scientific | 2025 |
| Interface Services Ltd | Extraterritorial | 2021 |
| Interfuse Media Ltd | Administrative & support | 2010 |
| Interiart Ltd | Manufacturing | 2017 |
| Interim USE | Transport & logistics | 2016 |
| Interiors Developments Limited | Construction | 2012 |
| Interklass U.K. Ltd. | Wholesale & retail | 1998 |
| Interlink Cars Ltd | Transport & logistics | 2020 |
| Intermedius Limited | Financial services | 2017 |
| Internafix Ltd | Construction | 2023 |
| International Academic Journals Limited | Education | 2026 |
| International Cable Association | Professional & scientific | 2013 |
| International Foods Centre Ltd | Wholesale & retail | 2025 |
| International Intraocular Implant Club | Professional & scientific | 2011 |
| International Military Services (EOD) Ltd | Administrative & support | 2015 |
| International Power Consulting Ltd | Extraterritorial | 2021 |
| International School of Revenue Management Ltd | Education | 2012 |
| International Therapy Space Ltd | Health & social care | 2024 |
| Interpersonnel UK Limited | Administrative & support | 2003 |
| Intertoll Highways Operations Limited | Construction | 2016 |
| Intertoll Limited | Construction | 2013 |
| Intervconsult Ltd | Information & communication | 2024 |
| Intex CPS Ltd | Construction | 2025 |
| Intlx Limited | Professional & scientific | 2015 |
| Into Coding Limited | Information & communication | 2016 |
| Intrada Ships Management Limited | Administrative & support | 1987 |
| Intrade&Consultancy Ltd | Wholesale & retail | 2020 |
| Intrafreight Ltd | Administrative & support | 2010 |
| Intraparts Ltd | Financial services | 2021 |
| Introgroup Limited | Professional & scientific | 1995 |
| Inventive Games Limited | Arts & recreation | 2026 |
| Inventive Live Limited | Hospitality | 2024 |
| Inventive Magic Limited | Hospitality | 2025 |
| Investment Partners Holdings Ltd | Financial services | 2020 |