| Img AS | Wholesale & retail | 1999 |
| Imjelt AS | | 2018 |
| Imjelt Golfsenter AS | Arts & recreation | 2004 |
| Immerbygg Norge AS | Administrative & support | 2026 |
| Imo AS | Real estate | 1993 |
| Imolo AS | Wholesale & retail | 2010 |
| Impahla Invest AS | Financial services | 2017 |
| Import & Export AS | Wholesale & retail | 2025 |
| Ims Drammen AS | Wholesale & retail | 2020 |
| In Front Design AS | Professional & scientific | 2016 |
| In-Tec AS | Information & communication | 1987 |
| Incendium Consult AS | Professional & scientific | 2015 |
| Incendium Holding AS | Professional & scientific | 2014 |
| Independent Hair AS | Other services | 2009 |
| Independent Living Norge AS | Other services | 2013 |
| Indermark Invest AS | Information & communication | 2013 |
| Indras Fotterapi AS | Health & social care | 2017 |
| Industri Elteam Da | | 1993 |
| Industri Engineering AS | Real estate | 1997 |
| Industri Engineering Eiendom AS | Real estate | 2011 |
| Industri Holding AS | Construction | 2007 |
| Industri Og Kompressor Tjenester AS | Wholesale & retail | 2000 |
| Industribelegg AS | Construction | 2007 |
| Industrikurs AS | Education | 2005 |
| Industritaksering AS | Professional & scientific | 1987 |
| Inergeo AS | Professional & scientific | 2012 |
| Inex Eiendom AS | Wholesale & retail | 1986 |
| Inex Holding AS | | 1988 |
| Inference Holding AS | | 2025 |
| Infiniti Medical AS | Wholesale & retail | 1992 |
| Infinity Designs AS | Professional & scientific | 2021 |
| Infinity Fabrtkk AS | Professional & scientific | 2022 |
| Infinity Furniture Care AS | Wholesale & retail | 2011 |
| INFLOW24 AS | Professional & scientific | 2023 |
| Inforce Holding AS | | 2025 |
| Inform.As | | 2000 |
| Infoserve AS | Professional & scientific | 2000 |
| Infront Consult AS | Professional & scientific | 2021 |
| Ing Dag Ivar Østby AS | Construction | 1997 |
| Ing Rybergsgate 48 AS | Real estate | 2015 |
| Ing. Ludvigsens GT. 24 AS | Real estate | 2016 |
| Ing. Rybergsgate 102 AS | Real estate | 2012 |
| Ingeniør Ivar Pettersen AS | Construction | 1991 |
| Ingeniør Nicolai Grøntoft Ans | Professional & scientific | 1990 |
| Ingeniør Stig Johnsen AS | Professional & scientific | 2018 |
| Ingers Hus AS | Real estate | 2025 |
| Inglot Norge AS | Wholesale & retail | 2013 |
| Ingrain AS | Education | 2015 |
| Ingv Ludvigsensgt 14 Ans | Real estate | 1988 |
| Ingvild Nakstad Helsetjenester AS | Health & social care | 2024 |
| Ingvild Sehl Holding AS | | 2025 |
| Inino AS | Real estate | 2005 |
| Innocom AS | Professional & scientific | 2017 |
| Innocom Invest AS | Professional & scientific | 2018 |
| Innolaunch AS | Information & communication | 2023 |
| Innoquest AS | Information & communication | 2024 |
| Innovius AS | Professional & scientific | 2016 |
| Innregistrering.No AS | Information & communication | 2025 |
| Innvi Norge AS | Wholesale & retail | 1920 |
| Innviken AS | Real estate | 2005 |
| Inotex AS | Water & waste | 2024 |
| Inpeq Improved Nautical Propulsion Equipment AS | Professional & scientific | 2021 |
| Insam AS | Professional & scientific | 2006 |
| Insiros AS | Education | 2026 |
| Insolidum AS | Professional & scientific | 2015 |
| Insotech AS | Wholesale & retail | 2026 |
| Inspect AS | Professional & scientific | 2021 |
| Inspect Energi AS | Professional & scientific | 2023 |
| Inspect Holding AS | Real estate | 2021 |
| Inspect Innbo AS | Professional & scientific | 2012 |
| Inspect Legal AS | Professional & scientific | 2023 |
| Inspo Interiør AS | Professional & scientific | 2022 |
| Installatør Ove E Thoresen AS | Construction | 1992 |
| Intact Sport AS | Professional & scientific | 2019 |
| Intark AS | Professional & scientific | 2014 |
| Integral Audio AS | Wholesale & retail | 1998 |
| Intelli Solutions AS | Professional & scientific | 2022 |
| Intelligent Investments Holding AS | Real estate | 2022 |
| Intelnord AS | Information & communication | 2022 |
| Inter-Invest AS | | 1989 |
| Interactive AS | Construction | 2003 |
| Interfinance AS | Professional & scientific | 2014 |
| Interiør Og Beslag AS | Wholesale & retail | 2013 |
| Interiørgården AS | Real estate | 1987 |
| Interiørmetall AS | Construction | 1997 |
| International Quality AS | Professional & scientific | 1997 |
| Interroll AS | Wholesale & retail | 1991 |
| Intersonic AS | Arts & recreation | 2011 |
| Inti Viridis Holding AS | | 2025 |
| Invest That AS | Professional & scientific | 2011 |
| Invest This AS | | 2021 |
| Investa Kapital AS | Administrative & support | 2024 |
| Investadoren AS | Real estate | 2024 |
| Investech AS | | 2019 |
| Investgruppen AS | Real estate | 2013 |
| Investigo AS | Financial services | 2008 |
| Investor Compagniet AS | Real estate | 1998 |
| Investorservice AS | Professional & scientific | 2013 |
| Inwaves AS | Professional & scientific | 2022 |
| Ir Revisjon AS | Professional & scientific | 1995 |