| Il Ros Arena AS | Spikkestad | 2009 |
| Il Ros Arena Drift AS | Spikkestad | 2010 |
| Iliana Papadimitriou Artworks AS | Oslo | 2025 |
| Ilja Pilja AS | Oslo | 2016 |
| Imjelt Golfsenter AS | Drammen | 2004 |
| Impact Shows AS | Oslo | 2014 |
| Imperia Gym - Sandaker, AS | Oslo | 2015 |
| Imperia Gym, AS | Oslo | 2015 |
| Imperiet AS | Kristiansand S | 2007 |
| Imperium AS | Askim | 2019 |
| Impossible Da | Oslo | 2011 |
| Imprint Da | Jørpeland | 2006 |
| Improfolk SA | Hanestad | 2013 |
| Impulse Treningssenter AS | Trondheim | 2014 |
| Imrestind AS | Hemsedal | 2015 |
| In Consept Bingo Ans | Haugesund | 2001 |
| In North AS | Alta | 2018 |
| In Shape AS | Olsvik | 2007 |
| In the Country Da | Oslo | 2009 |
| In the Park AS | Oslo | 2017 |
| Ina Johannesen AS | Nesoddtangen | 1987 |
| Inatur Norge AS | Namsos | 2002 |
| Incicon AS | Oslo | 1998 |
| Indian Food Records Da | Duken | 2010 |
| Indian Summer Da | Skien | 2006 |
| Indieforfatterne SA | Kristiansand S | 2020 |
| Indoor Golf Trondheim AS | Trondheim | 2024 |
| Indre Hanken Båtlag SA | Ålesund | 1983 |
| Indre Lundøy Grunneierlag SA | Engeløya | 2017 |
| Indre Sula Trening AS | Eidsnes | 2025 |
| Indre Østfold Golfsenter AS | Askim | 2021 |
| Indreberg Tours AS | Tromsø | 2025 |
| Indris Pro AS | Oslo | 2001 |
| Inductive Culture Nuf | Oslo | 2011 |
| Ine Jansen AS | Oslo | 2019 |
| Inertia AS | Nedenes | 2022 |
| Inferno Metal Festival Nuf | Oslo | 2010 |
| Infinity Blue AS | Oslo | 2016 |
| Infoliten AS | Tofte | 2012 |
| Informa Markets (UK) Limited | London Sw1P 1Wg England | 2019 |
| Informasjonshuset AS | Forsand | 2011 |
| Ing. Lubomir Ovciarik Nuf | Sk-91901 Dlhá | 2026 |
| Inga Ibsdotter Lilleaas AS | Nesoddtangen | 2026 |
| Ingar Bergby AS | Tårnåsen | 2010 |
| Ingebjørg Bratland AS | Oslo | 2018 |
| Ingeborg Rosenberg AS | Lillesand | 2013 |
| Ingeborgs Musikktjenester AS | Drevsjø | 2026 |
| Ingenomvei AS | Haslum | 2018 |
| Inger Og Knut (Den Gang) Da | Kristiansand S | 2002 |
| Ingimundarson Diving Service | Is-200 Kopavogi | 2013 |
| INGOLF365 AS | Sandnes | 2016 |
| Ingoodcompany AS | Kolbotn | 2024 |
| Ingrid Aguiluz AS | Ulset | 2021 |
| Ingrid Bolsø Berdal AS | Son | 2017 |
| Ingrid Krokvik Birkelid | Tromsø | 2013 |
| Ingrid La AS | Bergen | 2023 |
| Ingridviklysne AS | Oslo | 2022 |
| Ingska AS | Nøtterøy | 2024 |
| Ingunns Villagalleria AS | Namsos | 2022 |
| Ingwaz Ltd Nuf | Kvaløya | 2025 |
| Ingá Márjá Sarre AS | Kautokeino | 2020 |
| Inhouse AS | Sandefjord | 2018 |
| Inka Holde AS | Siggerud | 2005 |
| Inkeri Laitinen Produksjoner AS | Tana | 2022 |
| Inkognito Konserveringsatelier AS | Oslo | 2024 |
| Inkwall AS | Jakobsli | 2026 |
| Inn I Skauen AS | Brumunddal | 2025 |
| Inn På Konto Holding AS | Oslo | 2023 |
| Innas Kunst AS | Kvalsund | 2021 |
| Inner Castle Music AS | Melhus | 2003 |
| Inner East Records Da | Siggerud | 2003 |
| Inner Voice AS | Nesna | 2021 |
| Innesving AS | Skien | 2025 |
| Innfall AS | Stavanger | 2019 |
| Innfjorden Elveeierlag SA | Innfjorden | 1908 |
| Insane Rock Party AS | Oslo | 2018 |
| Inside Productions Da | Tønsberg | 1999 |
| Insight Events Aps | Dk-1113 København | 2017 |
| Insolite AS | Strusshamn | 2019 |
| Insono AS | Mandal | 2023 |
| Inspira Visjon AS | Trondheim | 2013 |
| Inspiratene Nuf | Jessheim | 2009 |
| Inspirator Investment Network AS | Oslo | 2000 |
| Inspired by Larsen AS | Oslo | 2019 |
| Inspiria Eiendom AS | Grålum | 2005 |
| Inspiria Science Center AS | Grålum | 2009 |
| Instant Oslo AS | Oslo | 2015 |
| Instedalen Skianlegg AS | Naustdal | 2013 |
| Instinct Eiken AS | Eiken | 2019 |
| Instinct Flekkefjord AS | Flekkefjord | 2010 |
| Instinct Kvinesdal AS | Kvinesdal | 2018 |
| Int Art Group AS | Fjerdingby | 2021 |
| Inter Padel AS | Sandnes | 2006 |
| Inter Padel Holding AS | Sandnes | 2021 |
| Intergolf AS | Stavanger | 2024 |
| International Coalition of Rhino Protection | Hjellestad | 2016 |
| International Creativity Workshop AS | Kråkerøy | 2016 |
| International Library of Fashion Research AS | Oslo | 2024 |
| International Orienteering Federation | Se-65225 Karlstad | 2022 |
| Intero Invest AS | Froland | 2016 |