| I NO I NO Developments Ltd | Construction | 2025 |
| I R Mcgarvey Opticians Limited | Wholesale & retail | 2003 |
| I.G. Gibson Limited | Professional & scientific | 2011 |
| IAC Waters Limited | Construction | 2019 |
| IAH Marketing Ltd | Professional & scientific | 2024 |
| Iain Shaw Dentistry Limited | Health & social care | 2025 |
| IAM Controls Ltd | Extraterritorial | 2018 |
| ICC Blackburn Ltd | Administrative & support | 2021 |
| ICC Valeting Service Limited | Other services | 2018 |
| Ice Cold 2 Piping Hot Ltd | Construction | 2026 |
| Ice Dental Limited | Health & social care | 2007 |
| Iconic Creative Limited | Administrative & support | 2025 |
| IDB Lettings Limited | Real estate | 2020 |
| Ideal Dental Care Limited | Professional & scientific | 2008 |
| Ideal Drylining Ltd | Construction | 2023 |
| Ideal Storage Limited | Other services | 2011 |
| Ifed Consult Limited | Administrative & support | 2023 |
| IG Cloud OPS Limited | Financial services | 2019 |
| IG Send Ltd | Information & communication | 2019 |
| IGS Joinery Ltd | Construction | 2025 |
| IJS Doctors Limited | Health & social care | 2017 |
| Imaru Property Ltd | Real estate | 2025 |
| Immanuel Enterprise Ltd | Wholesale & retail | 2026 |
| Income Group Limited | Professional & scientific | 2016 |
| Index Zero Consulting Limited | Information & communication | 2022 |
| Indian Stone Direct Limited | Administrative & support | 2010 |
| Indigo Haulage Ltd | Transport & logistics | 2021 |
| Indigo Vehicle Solutions Limited | Wholesale & retail | 2024 |
| Indikart Racing Limited | Arts & recreation | 2012 |
| Industrial Tank Services Limited | Professional & scientific | 2017 |
| Info-Gate Direct Ltd | Education | 2011 |
| Infracare and Consulting Ltd | Construction | 2025 |
| Infranorth Limited | Manufacturing | 2018 |
| Ingenium Wound Consultancy Limited | Education | 2006 |
| Inglewood Projects Ltd | Professional & scientific | 2022 |
| Inkd Brow Studio Ltd | Other services | 2025 |
| Inn Confidence Limited | Education | 2001 |
| Innospec (Plant) Limited | Administrative & support | 1966 |
| Innospec Developments Limited | Professional & scientific | 1998 |
| Innospec Finance Limited | Administrative & support | 2005 |
| Innospec Fuel Specialties Limited | Administrative & support | 1997 |
| Innospec Holdings Limited | Professional & scientific | 2000 |
| Innospec International Limited | Administrative & support | 1997 |
| Innospec Limited | Manufacturing | 1938 |
| Innospec Performance Chemicals Europe Limited | Wholesale & retail | 2016 |
| INNOV8 Technologies Ltd | Information & communication | 2022 |
| INNOV8EFFICIENCY Ltd | Professional & scientific | 2020 |
| Innovative HSE Consultancy Solutions Limited | Professional & scientific | 2025 |
| Innovent Recycling Ltd | Information & communication | 2017 |
| Insight Support Educate Empower Ltd | Education | 2025 |
| Inspire by Sbarduno CIC | Education | 2022 |
| Institute of Health Promotion and Education | Other services | 2013 |
| Insurica Ltd | Financial services | 2025 |
| Integral Engineering Solutions Limited | Information & communication | 2016 |
| Integrato Solutions Limited | Information & communication | 2022 |
| Intelligence Group Limited | Information & communication | 2005 |
| Inter Car Cleaning Cheshire Oaks Ltd | Administrative & support | 2023 |
| Internal Affairs Limited | Administrative & support | 2012 |
| Inventive Spaces Limited | Construction | 2022 |
| Invest Hive Limited | Other services | 2025 |
| Invincible Homes (Chester) Limited | Real estate | 1956 |
| Invisergy Ltd | Professional & scientific | 2025 |
| IQ Engineering Systems Limited | Professional & scientific | 2013 |
| IRD Management Ltd | Professional & scientific | 2018 |
| IRI G Construction Ltd | Construction | 2022 |
| Ironform Financial Limited | Professional & scientific | 2025 |
| ISA Collective Ltd | Health & social care | 2026 |
| Isle of Astute Limited | Health & social care | 2019 |
| Isocomply Ltd | Professional & scientific | 2014 |
| IT Delivery Ltd | Information & communication | 2025 |
| Itsfail Ltd | Wholesale & retail | 2021 |
| Itty Bitty Ltd | Extraterritorial | 2015 |
| ITZ Limited | Administrative & support | 2007 |
| IW Nominee Limited | Professional & scientific | 2012 |
| Ixion Consulting Ltd. | Health & social care | 2016 |
| J & a Oak Products Ltd | Manufacturing | 2025 |
| J & K Hawkins Limited | Real estate | 2018 |
| J a Mcclure Ltd | Health & social care | 2025 |
| J and K Safety Solutions Ltd | Professional & scientific | 2024 |
| J Ganatra Ltd | Health & social care | 2015 |
| J Hobbs Catering Ltd | Hospitality | 2024 |
| J Horne & Jayne's Travel Limited | Transport & logistics | 2012 |
| J J S a Properties Limited | Real estate | 2020 |
| J James Joinery Limited | Construction | 2008 |
| J Kuspisz Ltd | Other services | 2015 |
| J L Hayes Developments Limited | Hospitality | 2009 |
| J North Associates Ltd | Arts & recreation | 2019 |
| J P P Motors Ltd | Wholesale & retail | 2023 |
| J W Norris Limited | Health & social care | 2018 |
| J&L Assets Ltd | Real estate | 2026 |
| J&L Associates Ltd | Health & social care | 2019 |
| J.C.(Narborough) Limited | Hospitality | 2013 |
| J.E.M. Enterprises Limited | Professional & scientific | 1996 |
| J.J.W Learning & Development Ltd | Administrative & support | 2019 |
| J.Kent (Auctioneers) Limited | Wholesale & retail | 1940 |
| J.T. Metz Ltd | Information & communication | 2013 |
| J.Watson Ltd | Real estate | 2025 |
| Jaalt Engineering Limited | Other services | 2004 |
| Jackie Mount Ltd | Extraterritorial | 2024 |
| Jacob Enterprise Ltd | Real estate | 2024 |