| Intelology Limited | Real estate | 2014 |
| Intent Life Limited | Hospitality | 2019 |
| Interact Management Solutions Ltd | Professional & scientific | 2009 |
| Intergage (Holdings) Limited | Financial services | 2017 |
| Intergage Group Limited | Information & communication | 2000 |
| Intergage Marketing Engineers Ltd | Other services | 2021 |
| Intergage Marketing Systems Limited | Other services | 2021 |
| Intergage Partnerships Limited | Other services | 2021 |
| Interim CTO Ltd | Information & communication | 2016 |
| Interim Endeavour Ltd | Professional & scientific | 2024 |
| Interior Fit Limited | Manufacturing | 1997 |
| Intermedia Supplies Limited | Information & communication | 1992 |
| International Reseal and Probate Services Limited | Professional & scientific | 2018 |
| International Cards & Gifts Limited | Manufacturing | 2004 |
| International Safeguarding Solutions Limited | Information & communication | 2024 |
| International Team Ltd | Professional & scientific | 2016 |
| Intrasystems Global Ltd | Construction | 2024 |
| Intrasystems Holdings Ltd | Financial services | 2024 |
| Intratech Limited | Information & communication | 2018 |
| Intrinsium Intelligence Ltd | Information & communication | 2022 |
| Intwine Jewellery Ltd | Manufacturing | 2024 |
| Investor Administration Solutions Limited | Financial services | 1996 |
| Invictasoft Ltd | Information & communication | 2023 |
| Invictus.Global Commerce Services Limited | Professional & scientific | 2024 |
| Invigilo Financial Services Limited | Financial services | 2020 |
| Invursus Limited | Real estate | 2023 |
| Iobaydi Limited | Professional & scientific | 2025 |
| ION Enterprises Limited | Manufacturing | 1990 |
| Ioniq Consulting Limited | Professional & scientific | 2020 |
| Iotbw Limited | Information & communication | 2022 |
| Iotrex Solutions Limited | Other services | 2021 |
| IOW PUB Co Ltd | Hospitality | 2024 |
| IP Property Developments Limited | Construction | 1994 |
| IPC Financial Services Limited | Real estate | 1999 |
| IPM International Sales Ltd | Professional & scientific | 2022 |
| Ipoc AI Limited | Information & communication | 2026 |
| IPR Environmental Limited | Water & waste | 2017 |
| Iron Born Limited | Other services | 2022 |
| Iron Records Ltd | Wholesale & retail | 2026 |
| Ironart Fabrications of Wimborne Ltd | Manufacturing | 2025 |
| Ironstache Elixirs Ltd | Manufacturing | 2022 |
| Irregular Solutions Ltd | Administrative & support | 2025 |
| Irwin Tech Services Limited | Manufacturing | 2013 |
| Isher Kirpa Limited | Information & communication | 2016 |
| Isher Sweets Limited | Wholesale & retail | 2018 |
| Island View Management Company Limited | Households | 1999 |
| Isle of Wight Bowling Limited | Arts & recreation | 2009 |
| Ismene Ltd | Professional & scientific | 2023 |
| Ismini K Ltd | Health & social care | 2021 |
| Ispeak Education Ltd | Education | 2025 |
| IT Citysolutions Limited | Administrative & support | 2006 |
| IT Cocos Ltd | Information & communication | 2020 |
| IT Programmes Limited | Information & communication | 2018 |
| IT Service Consult Ltd | Information & communication | 2016 |
| IT Spartans Limited | Information & communication | 2022 |
| It's ALL Gravy Ltd | Professional & scientific | 2023 |
| ITA Analysis Limited | Information & communication | 2021 |
| Iteration Zero Ltd | Information & communication | 2024 |
| Ithax Analysis Limited | Professional & scientific | 2024 |
| ITM Components Limited | Information & communication | 1995 |
| ITM Direct Ltd | Extraterritorial | 2016 |
| Itsmc Ltd | Information & communication | 2024 |
| Itwhiz Computer Services Limited | Information & communication | 2013 |
| IVY Barns Management Company Ltd | Real estate | 2025 |
| IVY Electrical Limited | Construction | 2007 |
| Iyetu Ltd | Manufacturing | 2024 |
| J & J Enterprise Consulting Limited | Information & communication | 2011 |
| J & S Milhofer Limited | Wholesale & retail | 1982 |
| J a Lucas Ltd | Hospitality | 2017 |
| J a Spencer Consulting Ltd | Information & communication | 2026 |
| J Curran Ltd | Information & communication | 2022 |
| J Lewis Financial Planning Ltd | Professional & scientific | 2019 |
| J Pisani Consulting Ltd | Information & communication | 2024 |
| J Pittard Limited | Professional & scientific | 2003 |
| J T Automotive Dorset Ltd | Wholesale & retail | 2022 |
| J&K Productions Ltd | Information & communication | 2021 |
| J&N James Properties Limited | Real estate | 2021 |
| J. Lukins Limited | Professional & scientific | 2016 |
| J.K Design Limited | Professional & scientific | 2021 |
| J.M. Paine & S.W. Paine Properties Limited | Real estate | 2001 |
| J.S Contract Consultancy Services Limited | Professional & scientific | 2012 |
| J.Toogs Ltd | Hospitality | 2025 |
| JA Capital Partners Limited | Professional & scientific | 2020 |
| JA Financial Advisors Limited | Professional & scientific | 2021 |
| JA Legal Limited | Professional & scientific | 2017 |
| JA RA Limited | Information & communication | 2015 |
| Jacc GIN Limited | Wholesale & retail | 2025 |
| Jacel Consulting Ltd | Information & communication | 2022 |
| Jack & Bill Limited | Administrative & support | 2008 |
| Jack Lodge Photography Limited | Professional & scientific | 2024 |
| Jack Willis TV Ltd | Information & communication | 2015 |
| Jackdaw Technology Group Limited | Information & communication | 2016 |
| Jackieson Engineering Ltd | Professional & scientific | 2023 |
| JAD Project Consultancy Limited | Professional & scientific | 2026 |
| Jadem SP Ltd | Administrative & support | 2007 |
| JAI Comms Ltd | Information & communication | 2025 |
| Jainita Shah Consulting Ltd | Information & communication | 2023 |
| JAM Property Services Ltd | Real estate | 2018 |
| Jamaica Fresh Ltd | Wholesale & retail | 2009 |
| Jamal Boxing Ltd | Arts & recreation | 2024 |