| Icke & Co Limited | Professional & scientific | 2009 |
| Iconic Beautique Limited | Other services | 2022 |
| Iconic Boutique Limited | Other services | 2018 |
| Iconic Hair-Dress Limited | Other services | 2022 |
| Idol Clothing Ltd | Wholesale & retail | 2025 |
| Ietek Ltd | Transport & logistics | 2025 |
| Ignaceous Ltd. | Professional & scientific | 2006 |
| Ikon Parkview Management Company Limited | Extraterritorial | 2015 |
| Illuminity Ltd | Information & communication | 2013 |
| IM9 Limited | Construction | 2021 |
| Imogen Design Ltd | Professional & scientific | 2020 |
| Imola Cars Limited | Manufacturing | 1995 |
| Implex Agricultural Limited | Financial services | 2014 |
| Implex Property Management Limited | Real estate | 2001 |
| Improve IT T/A Peter Dickenson Ltd | Other services | 2009 |
| Imvu Cosmetics Ltd | Wholesale & retail | 2019 |
| IN Control Engineering (Evesham) Limited | Professional & scientific | 2011 |
| Inchbald Day Planning and Development Limited | Real estate | 2018 |
| Incontrol Marketing Group Ltd | Information & communication | 2017 |
| Incontrol Marketing Ltd | Information & communication | 2020 |
| Independent Engineering Company Limited(The) | Extraterritorial | 1971 |
| Independent Technical Advice Limited | Agriculture & fishing | 2006 |
| Indy Limited | Wholesale & retail | 2007 |
| Influential Design Limited | Other services | 2014 |
| Ingles Development Corp Limited | Construction | 2025 |
| Inishfree | Health & social care | 2000 |
| Inn Significant Limited | Hospitality | 2022 |
| Innservice PUB Solutions Limited | Professional & scientific | 2009 |
| Inspire L & D Limited | Education | 2008 |
| Instant Response UK Limited | Transport & logistics | 2001 |
| Intelligent Resilience Ltd | Extraterritorial | 2023 |
| Interfab Limited | Manufacturing | 1997 |
| Interim Quality Management Ltd | Professional & scientific | 2014 |
| Interiors by Nicola Limited | Professional & scientific | 2018 |
| Ioan&Bia Ltd | Transport & logistics | 2022 |
| Ionica Consulting Limited | Professional & scientific | 2006 |
| Iron Grasshopper Ltd | Real estate | 2015 |
| Ironmann Gym Ltd | Arts & recreation | 2011 |
| Isham House Management Limited | Real estate | 2006 |
| ISOL8 Teknologies Limited | Manufacturing | 2004 |
| Isolec Limited | Professional & scientific | 2000 |
| Issab Developments Ltd | Financial services | 2023 |
| ISW Consulting Limited | Extraterritorial | 2020 |
| ITA Logistic 25 Ltd | Transport & logistics | 2025 |
| Italiamato Limited | Extraterritorial | 2026 |
| It’S Only Money Ltd | Hospitality | 2022 |
| Iulian&Iuliana Ltd | Transport & logistics | 2020 |
| IVY Lane 1973 Limited | Extraterritorial | 2014 |
| Izanami Investments Limited | Real estate | 2016 |
| Izzzo Services Limited | Information & communication | 2020 |
| J H Heating and Plumbing Limited | Manufacturing | 2009 |
| J J Properties (Midlands) Limited | Real estate | 2017 |
| J L Thould Limited | Construction | 2017 |
| J M Bailey Limited | Information & communication | 2011 |
| J R Cleaning & Sons Ltd | Administrative & support | 2024 |
| J R Developements Ltd | Construction | 2017 |
| J R Payne Haulage Limited | Transport & logistics | 2005 |
| J S Ward Limited | Hospitality | 2025 |
| J&G Motors Ltd | Wholesale & retail | 2025 |
| J&R Auto Repairs Ltd | Wholesale & retail | 2024 |
| J. R. Tustin & Sons Limited | Agriculture & fishing | 1961 |
| J.& J.Bannister(Evesham)Limited | Wholesale & retail | 1965 |
| J.A. Consult Limited | Professional & scientific | 2015 |
| J.Williamson(Sedgeberrow) Ltd | Administrative & support | 2020 |
| J3 Development Limited | Professional & scientific | 2019 |
| Jack Harrison Agencies Limited | Wholesale & retail | 2003 |
| Jack Surman Web Development Solutions Limited | Information & communication | 2024 |
| James & Palmer Limited | Wholesale & retail | 2021 |
| James Dyer Transport Limited | Transport & logistics | 2018 |
| James Macnaughton Wealth Management Ltd | Professional & scientific | 2020 |
| James the Fish Ltd | Wholesale & retail | 2001 |
| Jamlam Limited | Other services | 2012 |
| Jamm Design Limited | Professional & scientific | 2008 |
| Jason Bowld Music Ltd | Arts & recreation | 2013 |
| Jaydans Ltd | Information & communication | 2025 |
| Jaydy Limited | Real estate | 2025 |
| Jbmr Ltd | Transport & logistics | 2025 |
| Jbrt Developments Limited | Construction | 2015 |
| JDJ Landscapes Limited | Administrative & support | 2022 |
| Jeantrans Limited | Transport & logistics | 2024 |
| Jecusv Ltd | Transport & logistics | 2018 |
| Jeffries Recruitment Ltd | Administrative & support | 2023 |
| Jephson Legal Limited | Professional & scientific | 2026 |
| Jeremy Knight Estate Agents Limited | Real estate | 2005 |
| JET Plant Hire Group Holdings Limited | Financial services | 2023 |
| JET Plant Hire Holdings Limited | Financial services | 2016 |
| JET Plant Hire Limited | Construction | 1989 |
| Jetscape Leisure Limited | Administrative & support | 2001 |
| Jewel Digital Consulting Ltd | Information & communication | 2023 |
| JF Pro-Builders Ltd | Construction | 2023 |
| JGB Barbers Ltd | Other services | 2023 |
| JGB Tattoo Ltd | Arts & recreation | 2024 |
| JJ Group (Midlands) Ltd | Transport & logistics | 2022 |
| JJ Roofing Ltd | Construction | 2023 |
| JJ Roofing Oxford Limited | Construction | 2026 |
| JKS Cleans Limited | Administrative & support | 2022 |
| JMC Insulations Limited | Construction | 2009 |
| Jmjo Ltd | Professional & scientific | 2016 |
| Jo&R Group Limited | Other services | 2011 |
| Jo&R Homes Limited | Real estate | 2017 |