| Trysil Race Elite AS | Education | 2020 |
| Trysil Regnskap AS | Professional & scientific | 2026 |
| Trysil Renholds-Service AS | Administrative & support | 2021 |
| Trysil Rep Og Sveis AS | Manufacturing | 2024 |
| Trysil Restaurantgruppe SA | Administrative & support | 2011 |
| Trysil Riverfront AS | Real estate | 2026 |
| Trysil Rør Holding AS | Construction | 2023 |
| Trysil Rørleggerbedrift AS | Construction | 2023 |
| Trysil Skishop Eiendom AS | Administrative & support | 1999 |
| Trysil Snekkeri AS | Manufacturing | 2012 |
| Trysil Sportshop AS | Wholesale & retail | 2014 |
| Trysil Storage AS | Real estate | 2014 |
| Trysil Taxi AS | Transport & logistics | 2023 |
| Trysil Troll AS | Wholesale & retail | 2024 |
| Trysil Utleie AS | Real estate | 2021 |
| Trysil Varmepumpe AS | Construction | 2020 |
| Trysil Vask Og Rens AS | Health & social care | 1986 |
| Trysil Ventilasjonsrengjøring AS | Administrative & support | 2025 |
| Trysil Økonomisenter AS | Professional & scientific | 2008 |
| Trysil-Engerdal Innkjøpslag SA | Wholesale & retail | 1990 |
| Trysilball AS | Real estate | 2019 |
| Trysilbil AS | Wholesale & retail | 2014 |
| Trysilbo AS | Real estate | 2022 |
| Trysilelva Camping Ans | Hospitality | 2010 |
| Trysilfjell Apartment Eiendom AS | Real estate | 2003 |
| Trysilfjell AS | Real estate | 2022 |
| Trysilfjell Eiendom AS | Real estate | 2006 |
| Trysilfjell Hytter AS | Construction | 2013 |
| Trysilfjell Utmarkslag Eiendom AS | Real estate | 2020 |
| Trysilfjell Utmarkslag SA | Real estate | 1971 |
| Trysilfjellet Dagligvare AS | Wholesale & retail | 2014 |
| Trysilfjellet Golf AS | Arts & recreation | 2000 |
| Trysilfjellet Handel AS | Wholesale & retail | 2015 |
| Trysilfjellet Viltstellområde | Real estate | 1997 |
| Trysilportalen AS | Real estate | 2008 |
| Trysilsetra AS | Real estate | 2010 |
| Trysiltannlegene AS | Health & social care | 2020 |
| TS Laft AS | Real estate | 2018 |
| Tystad Eiendom AS | Wholesale & retail | 2003 |
| Ulvsjøen Eiendom AS | Real estate | 2016 |
| Ulvsjøen Samdrift Da | Agriculture & fishing | 2007 |
| Unique Design AS | Manufacturing | 2025 |
| Vacation Trysil AS | Hospitality | 2024 |
| Vamos Trysil AS | Hospitality | 2020 |
| Varli AS | Agriculture & fishing | 1998 |
| Ve-Holding AS | Administrative & support | 2016 |
| Vestby Bygdeservice AS | Construction | 2024 |
| Vestby Vannverk SA | Water & waste | 1953 |
| Vestbyvegen 24 AS | Real estate | 2022 |
| Vestmo Invest AS | Financial services | 2016 |
| Vestsidevegen Eiendom AS | Real estate | 2022 |
| Villa Holtnes AS | Real estate | 2020 |
| Villa Sole Trysil AS | Hospitality | 2020 |
| Wassgren Consult AS | Professional & scientific | 2013 |
| William Notkevich Holding AS | Real estate | 2020 |
| Wilma Invest AS | Real estate | 2019 |
| Wiosam Holding AS | Hospitality | 2024 |
| Yilmaz AS | Hospitality | 2016 |
| Ze Bra Verksted AS | Other services | 1998 |
| Zyberia AS | Information & communication | 2013 |
| Økonomidekk AS | Wholesale & retail | 2003 |
| Ørbæk Design AS | Wholesale & retail | 2020 |
| Østgård Utvikling AS | Real estate | 2008 |
| Østhagen Skog Drift Ans | Agriculture & fishing | 2007 |
| Øverby Sameie Da | Agriculture & fishing | 2025 |
| Øystein Søgaard AS | | 2020 |
| Øyvind Søgaard AS | | 2005 |
| Øyvind Ørtoft Bygg AS | Construction | 2024 |