| Ihandle Iot AS | Information & communication | 2022 |
| Ihlevi Holdings AS | Construction | 2013 |
| Ihv Holding AS | | 2022 |
| Ik Group AS | Mining & quarrying | 2005 |
| Ik Subsea AS | Mining & quarrying | 1987 |
| Ik Topside AS | Mining & quarrying | 2025 |
| Ikeen Trading AS | Real estate | 2011 |
| Ikm Flux AS | Wholesale & retail | 2020 |
| Ikm Hendrik Veder AS | Manufacturing | 1992 |
| Ikm Inspection AS | Professional & scientific | 1988 |
| Ikm Well Services AS | Professional & scientific | 2022 |
| Ikm Welldrone Technologies AS | Professional & scientific | 2022 |
| Ikn Tech AS | Professional & scientific | 2023 |
| Ikr Ingeniørkontor AS | Real estate | 2007 |
| Ikt Teknikk Da | Information & communication | 2005 |
| Il Holding AS | Financial services | 2017 |
| Ildsjelen Stavanger AS | Wholesale & retail | 2014 |
| Illuminati Consulting AS | Real estate | 2013 |
| Ilmaca AS | Financial services | 2005 |
| Im Gramstad AS | Financial services | 2018 |
| Im Solutions AS | Manufacturing | 2024 |
| Image Eiendom AS | Real estate | 1989 |
| Image Salong AS | Other services | 2022 |
| Imanagement AS | Real estate | 2011 |
| Imi Holding AS | Real estate | 1999 |
| Imi Investering AS | Real estate | 2022 |
| Imi Tjensvoll Eiendom AS | Administrative & support | 1999 |
| Imi Åpen Barnehage AS | Education | 2005 |
| Imiq Gruppen AS | Real estate | 2021 |
| Imj Holding AS | | 2023 |
| Immutable AS | Information & communication | 2023 |
| Impact Lab AS | Education | 2020 |
| Impact Million 2023 AS | Financial services | 2023 |
| Impact Million 2024 AS | | 2024 |
| Impact Million 2025 AS | | 2025 |
| Impact Million 2026 AS | | 2026 |
| Impello AS | Professional & scientific | 2003 |
| Imperator Consult AS | Professional & scientific | 2011 |
| Imperial Oil Resources Limited | Mining & quarrying | 2004 |
| Impero Cafe AS | Wholesale & retail | 2026 |
| Impuls Bevegelsen AS | Other services | 2013 |
| Ims Import AS | Wholesale & retail | 2015 |
| Ims Lead AS | Professional & scientific | 2024 |
| Imsvest AS | | 2026 |
| Imtiaz Invest AS | | 2026 |
| IN2VIZION AS | Information & communication | 2024 |
| Incap AS | Information & communication | 2004 |
| Inco AS | Health & social care | 1992 |
| Incom Invest AS | | 2006 |
| Incremental Invest Holding AS | | 2025 |
| Independent Oil Tools AS | Mining & quarrying | 2006 |
| Independent Tool Pool AS | Administrative & support | 2005 |
| Indesign Ans | Information & communication | 1999 |
| Index Eiendom AS | Real estate | 1965 |
| India Tandoori Restaurant AS | Hospitality | 2016 |
| Indigo Vekst AS | Real estate | 2005 |
| Industri Eiendom AS | Real estate | 2013 |
| Industri Og Maritim Service AS | Manufacturing | 2006 |
| Industrial Management Services Consulting AS | Professional & scientific | 1999 |
| Industrial Services Norway AS | Wholesale & retail | 2018 |
| Industriell Vannbehandling AS | Professional & scientific | 2012 |
| Industriell Vannbehandling Holding AS | Professional & scientific | 2023 |
| Industriguide AS | Education | 2012 |
| Industripartnerne AS | Manufacturing | 2025 |
| Industripartnerne Drift AS | Manufacturing | 2026 |
| Industripartnerne Eiendom AS | Real estate | 2026 |
| Industripartnerne Group AS | | 2026 |
| Industriuka Expo AS | Professional & scientific | 2022 |
| Industry Comply AS | Information & communication | 2018 |
| Ineo Eiendom 2 AS | Real estate | 2024 |
| Ineo Eiendom AS | Real estate | 2011 |
| Inferens AS | Real estate | 2021 |
| Infinite Puls Balance AS | Wholesale & retail | 2026 |
| Infinity Engelschiøn AS | Financial services | 2016 |
| Influx Holding AS | Real estate | 2017 |
| Infographic AS | Information & communication | 2022 |
| Informantene Ans | Manufacturing | 1992 |
| Information Management by Holsen Consulting AS | Information & communication | 2023 |
| Infotiles AS | Information & communication | 2016 |
| Infotronics AS | Professional & scientific | 2018 |
| Infra Eiendom AS | Real estate | 2025 |
| Infrastructure Networks AS | Information & communication | 2023 |
| Ing Pro AS | Professional & scientific | 2023 |
| Inge Anda Holding AS | | 2018 |
| Inge Dørheim AS | Wholesale & retail | 2007 |
| Ingebrigtsen Eiendom AS | Real estate | 2024 |
| Ingeniørfirmaet L S Solland AS | Construction | 1973 |
| Ingeniørfirmaet Mitech AS | Wholesale & retail | 1992 |
| Ingeo AS | Professional & scientific | 2014 |
| Ingipingi AS | | 2023 |
| Ingrid Selmer AS | Education | 2016 |
| Inguel AS | | 2023 |
| Init Stavanger AS | Professional & scientific | 2014 |
| Innate Invest AS | Real estate | 2018 |
| Inner Melody AS | Health & social care | 2026 |
| Innfall AS | Arts & recreation | 2019 |
| Innflygningå AS | Real estate | 2020 |
| Innokap AS | Professional & scientific | 2023 |
| Innovasjonsparken AS | Real estate | 1998 |
| Innovasjonsparken Prosjektutvikling AS | Real estate | 2018 |