| Lonbakken AS | Manufacturing | 2005 |
| Lonbakken Mekaniske Verksted AS | Manufacturing | 1992 |
| Lyftho AS | | 2025 |
| Lågen Fiskeelv Sone 5 SA | Real estate | 1965 |
| Lågen Fly Fishing Da | Administrative & support | 2014 |
| M. Holum Holding AS | Wholesale & retail | 2018 |
| M. Holum Sport AS | Wholesale & retail | 2018 |
| Make IT Flow AS | Information & communication | 2021 |
| Manuellterapeut Mathilde Bakke AS | Health & social care | 2020 |
| Markus Bekken Holding AS | | 2024 |
| Massivbetong AS | Construction | 2025 |
| Meea Holding AS | Wholesale & retail | 2019 |
| Meire Vekst AS | Professional & scientific | 2020 |
| Meire VVS Regnskap AS | Professional & scientific | 2021 |
| Mellombakkerogberg AS | Construction | 2023 |
| Minel Gudbrandsdal AS | Construction | 2004 |
| Mir Otta AS | Wholesale & retail | 2015 |
| Modulteknikk AS | Professional & scientific | 2020 |
| Mullersgate 14 AS | Education | 2023 |
| Myrmoen Sag & Høvleri Ans | Manufacturing | 1990 |
| Mysuseter Servicesenter Da | Wholesale & retail | 2001 |
| Mysusetervegen SA | Real estate | 1887 |
| Narvik Maskintransport AS | Transport & logistics | 2023 |
| Nedregata 5A AS | Real estate | 2023 |
| Nord-Gudbrandsdal Media AS | Information & communication | 2005 |
| Norsk Kleber AS | Manufacturing | 1989 |
| Nye Feelgood Otta AS | Arts & recreation | 2026 |
| Nye Otta Skifer AS | Manufacturing | 2026 |
| Nye Sliperigata 1 AS | Real estate | 2026 |
| Nytal AS | Wholesale & retail | 1999 |
| O C Smidesang Holding AS | Financial services | 2005 |
| Od Eiendom AS | Real estate | 2019 |
| Olsen Og Jordet Eiendom Da | Real estate | 2003 |
| Opplæringskontoret Brimi-Kjøken SA | Education | 2008 |
| Optiker Gøsta Saastad AS | Wholesale & retail | 1998 |
| Otta Begravelsesbyrå Ans | Other services | 1991 |
| Otta Bilskadesenter AS | Wholesale & retail | 1991 |
| Otta Blomster & Begravelsesbyrå AS | Other services | 2025 |
| Otta Bok Og Papirhandel AS | Wholesale & retail | 1908 |
| Otta Eiendom AS | Real estate | 2001 |
| Otta Entreprenør AS | Construction | 2021 |
| Otta Hotelldrift AS | Hospitality | 1996 |
| Otta Jernvarehandel AS | Wholesale & retail | 1996 |
| Otta Karosseri Og Lakk AS | Other services | 2005 |
| Otta Lift AS | Administrative & support | 2014 |
| Otta Mat AS | Wholesale & retail | 2007 |
| Otta Panorama AS | Real estate | 2019 |
| Otta Regnskapskontor AS | Professional & scientific | 1986 |
| Otta S AS | Real estate | 2024 |
| Otta Sag Og Høvleri AS | Manufacturing | 1983 |
| Otta Skifer AS | Manufacturing | 1998 |
| Otta Sko AS | Wholesale & retail | 2005 |
| Otta Steakhouse AS | Hospitality | 2020 |
| Otta Taxisentral Da | Transport & logistics | 2003 |
| Otta Tekstil AS | Wholesale & retail | 1999 |
| Otta Vaktmestertjeneste AS | Administrative & support | 2013 |
| Ottadalen Bakside Grunneierlag SA | Agriculture & fishing | 2021 |
| Ottadalen Bygg AS | Construction | 2019 |
| Ottadalen Holding AS | Construction | 2020 |
| Ottaskifer Holding AS | Manufacturing | 2022 |
| Otto Moen Installasjon AS | Construction | 2018 |
| Parken Grill & Cafebar AS | Hospitality | 2005 |
| Parken Hårstudio Ans | Other services | 1998 |
| Pe-To Invest AS | Wholesale & retail | 2005 |
| Pillarguri Invest AS | Real estate | 2016 |
| Pillarguri Kafè AS | Hospitality | 2010 |
| Pillarguri Productions AS | Information & communication | 2024 |
| Pillargurivegen SA | Real estate | 2025 |
| Ple Holding AS | Wholesale & retail | 2022 |
| Pål Olstad AS | Real estate | 1997 |
| R. M. Bygg AS | Construction | 2013 |
| Rallargruppen AS | Real estate | 2015 |
| Raphamn Midtre Avløpsanlegg SA | Water & waste | 2025 |
| Raphamn Midtre Avløpslag SA | Water & waste | 2025 |
| Robust Beredskap AS | Education | 2024 |
| Rondane Fjellhytter AS | Hospitality | 2014 |
| Rondane Fjellteknikk AS | Construction | 2026 |
| Rondane Høyfjellshotell AS | Real estate | 1996 |
| Rondane Kjøtt Og Vilt Da | Manufacturing | 2007 |
| Rondane Maskin AS | | 2018 |
| Rondane Oppmåling AS | Professional & scientific | 2019 |
| Rondane Produksjon AS | Manufacturing | 2020 |
| Rondane Velvære AS | Other services | 2018 |
| Rondeslottet Hotell AS | Hospitality | 2017 |
| Rudi & Skogum Bygg AS | Construction | 1996 |
| Saagro AS | Wholesale & retail | 2005 |
| Sagtomta 2 AS | Real estate | 2024 |
| Salong Vi 2 Otta AS | Other services | 2010 |
| Sandbumoen Industriselskap AS | Real estate | 2021 |
| Sbl-Holding AS | Professional & scientific | 2024 |
| Sel Kraft AS | Energy | 2018 |
| Sellanrå Da | Agriculture & fishing | 2026 |
| Selsvollene Biffring AS | Agriculture & fishing | 2019 |
| Sideprosjekt AS | Education | 2009 |
| Sjoa Laft & Restaurering AS | Construction | 2015 |
| Sjoa Raftingsenter NWR AS | Arts & recreation | 2020 |
| Sjoa Riverjet AS | Transport & logistics | 2021 |
| Skeidar Otta AS | Wholesale & retail | 2006 |
| Skiferprodukter Design & Produksjon AS | Mining & quarrying | 2013 |
| Skjerdinghø Hyttegrend SA | Real estate | 1991 |