| Innovasjonsstudio AS | Professional & scientific | 2010 |
| Innovatio AS | Financial services | 2013 |
| Innovation Dock AS | Real estate | 2015 |
| Innovation Dock Event AS | Administrative & support | 2015 |
| Innovation Lab Norge AS | Information & communication | 2014 |
| Innovative Design Solutions AS | Financial services | 2005 |
| Innovex International (Europe) Limited Nuf | Wholesale & retail | 1995 |
| Innovinblue AS | Professional & scientific | 2018 |
| Inoor Holding AS | | 2021 |
| Inox AS | Professional & scientific | 2017 |
| Inrav Invest AS | Financial services | 2017 |
| Inro AS | Real estate | 2006 |
| Insectaveto AS | Administrative & support | 2025 |
| Inser AS | Construction | 2019 |
| Inside Kong Oscar Stavanger AS | Hospitality | 2013 |
| Insight Management AS | Professional & scientific | 2025 |
| Insima AS | | 2026 |
| Inspex AS | Information & communication | 2026 |
| Inspired Living AS | | 2026 |
| Inspirit Tattoo AS | Other services | 2020 |
| Installer AS | Information & communication | 2022 |
| Instamart AS | Wholesale & retail | 2024 |
| Instinct Tasta AS | Wholesale & retail | 2012 |
| Institutt for Anvendt Atferdsanalyse AS | Health & social care | 2001 |
| Insub AS | Professional & scientific | 2009 |
| Intactiw AS | Information & communication | 2001 |
| Integral Eda AS | Professional & scientific | 2025 |
| Integrering Og Kompetanse Akademiet AS | Education | 2023 |
| Integrotek AS | Professional & scientific | 2022 |
| Integrum Invest | | 2022 |
| Intellicess AS | Professional & scientific | 2025 |
| Intelligent Energy Solutions AS | Professional & scientific | 2016 |
| Intelligent Mud Solutions AS | Professional & scientific | 2010 |
| Intellion AS | Professional & scientific | 2026 |
| Intellion Holding AS | | 2026 |
| Intentum AS | | 2023 |
| Interfjord Norway AS | Transport & logistics | 2014 |
| Intergolf AS | Arts & recreation | 2024 |
| Interiørarkitektene Nil Engesland & Halsne Ans | Professional & scientific | 1988 |
| Interiørfaghuset T. Lund AS | Construction | 2018 |
| Interlude AS | Professional & scientific | 2018 |
| Intermediary AS | Professional & scientific | 2020 |
| Intermoor AS | Administrative & support | 1994 |
| Internasjonal Matsenter AS | Wholesale & retail | 2012 |
| International Holding AS | Wholesale & retail | 1996 |
| International Oilfield Services AS | Administrative & support | 1987 |
| Interpadel Forus AS | Arts & recreation | 2021 |
| Into Holding AS | Financial services | 2005 |
| Intra Group AS | | 2025 |
| Intra Motorsport AS | Other services | 2021 |
| Intra Solutions AS | Manufacturing | 2025 |
| Intrika AS | | 2023 |
| Intro Helse AS | Information & communication | 2023 |
| Inuk AS | Real estate | 2007 |
| Invaron AS | Information & communication | 2025 |
| Invenius Invest AS | Professional & scientific | 2018 |
| Inventi AS | Professional & scientific | 2024 |
| Invest Selvik AS | | 2005 |
| INVESTA9 AS | Real estate | 2018 |
| Investbekk AS | Professional & scientific | 2021 |
| Investeringsselskapet Det Gode Håp AS | Financial services | 2005 |
| Investix AS | | 2001 |
| Investlink AS | Manufacturing | 2008 |
| Investment & Management Services AS | Professional & scientific | 1997 |
| Investment Syndicate AS | | 2019 |
| Investore AS | Arts & recreation | 2005 |
| Investore Finans AS | | 2008 |
| Invisible Hand AS | Financial services | 2011 |
| Iopt Stavanger AS | Health & social care | 2018 |
| Ior Aqua AS | Mining & quarrying | 2004 |
| Ipark Eiendom I AS | Real estate | 2006 |
| Ipark Eiendom Parkering AS | Transport & logistics | 2010 |
| Ipeople AS | Administrative & support | 2011 |
| Ipi AS | Administrative & support | 2008 |
| Iqm AS | Professional & scientific | 2020 |
| Iqon AS | Professional & scientific | 2011 |
| Ir Holding AS | Real estate | 2022 |
| Ir Import AS | Wholesale & retail | 2005 |
| Irene Invest AS | Real estate | 2015 |
| Iris Labs AS | Professional & scientific | 2017 |
| Irman Development Association Ekonomiske Forening | Administrative & support | 2002 |
| Isachsen Kommunikasjon AS | Professional & scientific | 2013 |
| Isaksen Investering AS | | 2022 |
| Isbar AS | Hospitality | 2017 |
| Isfo Holding AS | | 2021 |
| Islandstone Ventures AS | | 2026 |
| Iso-Invest AS | | 2022 |
| Iso-Personell AS | Real estate | 2016 |
| Isotwo AS | Wholesale & retail | 2022 |
| Istanbul Grillkebab AS | Hospitality | 2017 |
| Istanbul Import AS | Wholesale & retail | 2019 |
| Istanbul Restaurantdrift Ans | Hospitality | 1999 |
| Istesso AS | Real estate | 2020 |
| IT Forces AS | Professional & scientific | 1986 |
| IT Holdco AS | | 2024 |
| IT Relasjon AS | Information & communication | 2017 |
| Itr Cybersecurity AS | Information & communication | 2019 |
| Itr Robotics AS | Information & communication | 2019 |
| Iull.No AS | Manufacturing | 2011 |
| IV Invest AS | Financial services | 2005 |