| IM 1 Ltd | Real estate | 2022 |
| Impact Field Marketing Group Limited | Financial services | 2022 |
| Impasto Limited | Information & communication | 2013 |
| Imperial Clean Ltd | Administrative & support | 2024 |
| IN HIS Name Ltd | Construction | 2023 |
| In-Alto Limited | Professional & scientific | 2006 |
| Incentive Finance Ltd | Financial services | 2020 |
| Incisive Healthcare Consulting Ltd. | Professional & scientific | 2014 |
| Incubise Investments Ltd | Real estate | 2015 |
| Incubise LLP | | 2013 |
| India Investments Limited | Households | 2020 |
| Indigena Biodiversity Limited | Health & social care | 2014 |
| Indigo Bar & Grill Ltd | Hospitality | 2008 |
| Indo European Limited | Hospitality | 2024 |
| Indoor Games Limited | Arts & recreation | 2025 |
| Indosat Limited | Administrative & support | 2009 |
| Industrious G Ltd | Professional & scientific | 2016 |
| Infinity Developments Propco Ltd | Construction | 2020 |
| Infinity Sun Properties Ltd | Real estate | 2022 |
| Infotech Management Limited | Information & communication | 2003 |
| Innovate Stadia Limited | Construction | 2022 |
| Innovation Capital Finance Limited | Financial services | 2018 |
| Innovative Partners Group Limited | Real estate | 2015 |
| Innovative Real Estate Developments Limited | Real estate | 2020 |
| Innovative Solutions for Decision Agriculture Ltd | Agriculture & fishing | 2018 |
| Insaland Limited | Professional & scientific | 2016 |
| Inside Design Interiors Limited | Other services | 2009 |
| Insights & Options Ltd | Professional & scientific | 2016 |
| Inspire Leadership Training Limited | Professional & scientific | 2021 |
| Inspiring Projects Group Limited | Professional & scientific | 2021 |
| Instant Office Space Limited | Real estate | 1999 |
| Instantlabour Limited | Transport & logistics | 2025 |
| Intalo Group Holding Limited | Financial services | 2025 |
| Intalo Group Ltd | Administrative & support | 2024 |
| Integra Property Services Limited | Real estate | 2003 |
| Integrated Broadcast Information Systems Limited | Information & communication | 1991 |
| Integrated FM Limited | Information & communication | 1992 |
| Inter-County Ambulance Service Ltd. | Health & social care | 1972 |
| Interexec Limited | Professional & scientific | 2022 |
| Interior Project Management Services Ltd | Construction | 2025 |
| International Council for Standardization in Haematology | Professional & scientific | 2017 |
| International Group Limited | Professional & scientific | 1977 |
| International Group Management Limited | Professional & scientific | 2006 |
| International Healthcare Group Limited | Professional & scientific | 1978 |
| International Hospitals Group Limited | Construction | 2015 |
| International Marine Radio Company Limited | Information & communication | 1992 |
| International Mobility Limited | Construction | 2013 |
| International Productions Limited | Information & communication | 1989 |
| Internet Business Consultants Limited | Information & communication | 2012 |
| Interphase Medical Ltd. | Administrative & support | 2022 |
| Iprocess Engineering & Consulting Ltd | Professional & scientific | 2016 |
| Iprology Limited | Professional & scientific | 2017 |
| IQ Management Solutions Ltd | Professional & scientific | 2018 |
| IQ Property Management Ltd | Real estate | 2018 |
| Iridium Management Ltd | Administrative & support | 2013 |
| Iris AV Limited | Information & communication | 2019 |
| IS Lettings Limited | Hospitality | 2024 |
| Island Business Solutions Ltd | Professional & scientific | 1995 |
| ISW Accounting Limited | Professional & scientific | 2013 |
| IT Invest Limited | Information & communication | 2008 |
| IT Trouble Free Limited | Information & communication | 2017 |
| IXA2A Ltd. | Information & communication | 2025 |
| Ixln FS Focus & Insight Ltd | Professional & scientific | 2021 |
| Iyla Health Ltd | Professional & scientific | 2026 |
| Iynk Ltd | Administrative & support | 2017 |
| IZY Investments Limited | Real estate | 2023 |
| J & J Preparations Limited | Hospitality | 1984 |
| J Bates Accounts Ltd | Professional & scientific | 2021 |
| J Beck IT Consulting Limited | Other services | 2020 |
| J Grip Limited | Information & communication | 2019 |
| J Penney Consulting Limited | Professional & scientific | 2021 |
| J Tobin Groundworks Limited | Construction | 2004 |
| J3 Edit Ltd | Information & communication | 2013 |
| Jackman Partners Ltd | Real estate | 2021 |
| Jackman Surveying Services Ltd | Professional & scientific | 2024 |
| Jacquards Limited | Professional & scientific | 2003 |
| Jade Jewellery Limited | Wholesale & retail | 2015 |
| Jade Medicare Limited | Extraterritorial | 2008 |
| Jagannath BMV Limited | Administrative & support | 2024 |
| Jaggery Limited | Wholesale & retail | 2020 |
| Jagpal Property Group Ltd | Real estate | 2026 |
| Jalaram Jyot Trust | Other services | 2012 |
| Jalbel Limited | Professional & scientific | 2022 |
| James Donovan Limited | Professional & scientific | 2018 |
| James Oliver Roberts Ltd | Professional & scientific | 2023 |
| Jamolidom Limited | Real estate | 2011 |
| Janac Associates Ltd | Professional & scientific | 2020 |
| Jane Guest Education Ltd | Administrative & support | 2011 |
| Janine Vitali Limited | Professional & scientific | 2017 |
| Jarkmoy Creations Limited | Professional & scientific | 2012 |
| Jarkmoy Limited | Professional & scientific | 2021 |
| Jarrett Property Services Ltd | Real estate | 2025 |
| JAS Consultant Ltd | Wholesale & retail | 2026 |
| Jasara Ltd | Real estate | 2021 |
| Jazzy BEE Ltd | Information & communication | 2024 |
| JB Refrigeration Limited | Construction | 2006 |
| JBM Incorporated Ltd | Wholesale & retail | 2026 |
| JCB Transport Ltd | Transport & logistics | 2024 |
| JCH Consulting Ltd | Health & social care | 2022 |
| JD8 Group Ltd | Construction | 2018 |