| Infraheim Eldre AS | Real estate | 2025 |
| Infraheim Enebolig AS | Real estate | 2021 |
| Infraheim Omsorg AS | | 2025 |
| Infrakit AS | Information & communication | 2017 |
| Infrakraft AS | Construction | 2022 |
| Inframedia AS | Professional & scientific | 2025 |
| Infranode AB | Real estate | 2018 |
| Infranode Advisory AS | Professional & scientific | 2026 |
| Infranor AS | Professional & scientific | 2025 |
| Infranord Norge AS | Construction | 2010 |
| Infranordic AS | Energy | 2013 |
| Infranordic Holding AS | | 2026 |
| Infrarail AS | Professional & scientific | 2012 |
| Infrared Infrastructure Vi Galley Bidco AS | | 2025 |
| Infrasoft AS | Information & communication | 2016 |
| Infrastructure Management AS | Information & communication | 2002 |
| Infrastructure Nordics 3 AS | Professional & scientific | 2021 |
| Infrastructure Nordics 4 AS | Information & communication | 2019 |
| Infrastructure Nordics III Parent AS | Information & communication | 2023 |
| Infrastructure Norway I AS | Information & communication | 2023 |
| Infratech AS | Wholesale & retail | 2025 |
| Infratek Norge AS | Construction | 2002 |
| Infrateq Group Norway AS | Information & communication | 2021 |
| Infravision AS | Professional & scientific | 2024 |
| Infront AS | Information & communication | 1998 |
| Infuture AS | Professional & scientific | 2007 |
| Infuture Invest AS | Construction | 2005 |
| Infutureco AS | | 2025 |
| Ing Arne Ånneland AS | Professional & scientific | 2026 |
| Ing Einar CHR Halvorseth AS | Construction | 1987 |
| Ing F Wickstrøm AS | Construction | 1992 |
| Ing Morten Fure AS Elektroentreprenøren | Construction | 1989 |
| Ing S D Baastad AS | Construction | 1985 |
| Ing Thor Marcus Kjemiske AS | Manufacturing | 1983 |
| Ing Tore Hekneby AS | | 2000 |
| Ing Yngve Ege AS | Wholesale & retail | 1986 |
| Ing. Arve Eid Ans | Real estate | 2005 |
| Ing. Borgen AS | Professional & scientific | 2018 |
| Ing. G Holte AS | Real estate | 2004 |
| Ing. Rasmussen & Strand AS | Professional & scientific | 2012 |
| Ing. Rybergsgate 108 AS | Other services | 2012 |
| Inga Invest AS | | 2021 |
| Inga Investment AS | | 2023 |
| Inga Sandve Musikk AS | Education | 2015 |
| Inga Scheitz Holding AS | Real estate | 2023 |
| Ingar Abrahamsen Holding AS | | 2024 |
| Ingar Nilsens Vei 7 Oslo AS | | 2025 |
| Ingar Nilsensvei 5 AS | Households | 1939 |
| Inge AS | | 2024 |
| Inge B. Nilsen Nuf | Information & communication | 2012 |
| Inge Fossland Invest AS | Professional & scientific | 2014 |
| Inge. AS | Financial services | 2005 |
| Ingebjørg Bratland AS | Arts & recreation | 2018 |
| Ingeborg Aas Vei 4 Eiendom AS | Real estate | 1971 |
| Ingeborg AS | Financial services | 2005 |
| Ingeborg Baustad AS | Professional & scientific | 2002 |
| Ingeborg Dæhlin AS | | 2005 |
| Ingeborg Gjærum AS | | 2020 |
| Ingebrigt Invest AS | | 2020 |
| Ingecid Norge AS | Professional & scientific | 2022 |
| Ingel Solutions AS | Professional & scientific | 2013 |
| Ingelin Clausen Holding AS | | 2019 |
| Ingelsfjord Invest AS | Financial services | 2005 |
| Ingen Fare AS | Administrative & support | 2024 |
| Ingenia Commerce Limited | Wholesale & retail | 2020 |
| Ingenier-Proyect World Limited | Real estate | 2021 |
| Ingenieria Especializada Obra Civil E Industrial S.A Nuf | Professional & scientific | 2015 |
| Ingeniør Bjørn R Bolstad AS | Real estate | 1994 |
| Ingeniør Christen Smith & Co AS | Real estate | 2025 |
| Ingeniør Gunnar Johansson AS | Construction | 2011 |
| Ingeniør Hans Becker AS | Construction | 1979 |
| Ingeniør Joar L. Søvik AS | Professional & scientific | 2026 |
| Ingeniør Kjeld W Eriksen AS | Manufacturing | 1962 |
| Ingeniør Knut Larsen AS Aut Rørleggermester | Construction | 2002 |
| Ingeniør L Brinchmann Mek Verksted AS | Real estate | 1961 |
| Ingeniør Larsson AS | Construction | 2010 |
| Ingeniør Loe AS | Professional & scientific | 2023 |
| Ingeniør Og Tømrermester Faye AS | Real estate | 2015 |
| Ingeniør Per Fossum AS | Real estate | 1986 |
| Ingeniør Rybergs Gate 44 AS | Real estate | 2019 |
| Ingeniør Service Ans | Professional & scientific | 1990 |
| Ingeniør Service AS | Professional & scientific | 1997 |
| Ingeniør Terje Melleberg AS | Real estate | 2005 |
| Ingeniør Tidemand AS | Construction | 1926 |
| Ingeniørbygg Utvikling AS | Wholesale & retail | 1996 |
| Ingeniørenes Serviceselskap AS | Real estate | 1929 |
| Ingeniørfirma Knut J. Bø AS | Wholesale & retail | 2011 |
| Ingeniørfirmaet Stensrud AS | Real estate | 1983 |
| Ingeniørkonsult AS | Professional & scientific | 2012 |
| Ingeniørkontoret Ingenia AS | Professional & scientific | 1993 |
| Ingeniørplan AS | Professional & scientific | 2002 |
| Ingenmans AS | Hospitality | 2021 |
| Ingensteds AS | Hospitality | 2012 |
| Ingensteds Booking AS | Professional & scientific | 2025 |
| Ingenting AS | Hospitality | 2018 |
| Ingenuity Factor AS | Professional & scientific | 2009 |
| Inger Media AS | Information & communication | 2013 |
| Ingerheiberg.No AS | Professional & scientific | 2024 |
| Ingersoll-Rand AB | Professional & scientific | 1995 |
| Ingerø Investment AS | Real estate | 2003 |