| Abnor AS | Professional & scientific | 2001 |
| Annes Klær AS | Wholesale & retail | 2014 |
| AS Helldal & Co | Construction | 2005 |
| Aslaksen Bygg Og Anleggsteknikk AS | Professional & scientific | 2020 |
| Badia AS | Wholesale & retail | 2011 |
| Badstuegruppen Bygg AS | Construction | 2026 |
| Bakke Auran Holding AS | Real estate | 2025 |
| Bladet Tysnes AS | Information & communication | 2001 |
| Blikk Design AS | Professional & scientific | 2017 |
| Brekke Eiendom AS | Real estate | 1976 |
| Bygg Tysnes AS | Wholesale & retail | 2015 |
| Byggmeister Belt AS | Construction | 2016 |
| Carisma Frisør Og Solstudio AS | Other services | 2003 |
| Dalland Invest AS | | 2023 |
| Fagerheim AS | Real estate | 2021 |
| Fingamezone AS | Information & communication | 2026 |
| Fonna AS | Real estate | 2013 |
| Frisøren På Tysnes AS | Other services | 2026 |
| Frisøren På Tysnes Da | Other services | 2009 |
| Gåsavika Vannlag SA | Water & waste | 2019 |
| Heggland Psykologtjenester AS | Health & social care | 2024 |
| Helland Capital AS | | 2025 |
| Helland Housing AS | Real estate | 2026 |
| Helldal AS | Construction | 2005 |
| Hopeium AS | | 2026 |
| Horso AS | Professional & scientific | 2015 |
| I & M Holding AS | Real estate | 2009 |
| Ivyelli AS | Wholesale & retail | 2016 |
| Jeppland AS | | 2025 |
| JL Eiendommer AS | Real estate | 2021 |
| JL Lund Holding AS | | 2025 |
| K Hagen Holding AS | Financial services | 2017 |
| Kaien Utvikling AS | Real estate | 2014 |
| Kines Hudpleie AS | Other services | 2024 |
| Knepet AS | Financial services | 2010 |
| Kpov AS | Real estate | 2015 |
| Kulturkontoret AS | Arts & recreation | 2022 |
| Lavik Mur & Flis AS | Construction | 2022 |
| Livi Holding AS | | 2005 |
| LR Fargestudio AS | Professional & scientific | 2024 |
| Lysekloster Miljøpark AS | Mining & quarrying | 2026 |
| Mandelhuset AS | Hospitality | 2007 |
| Mandelhuset Eigendom AS | Real estate | 2012 |
| Marinegruppen AS | Manufacturing | 2025 |
| Merki AS | Information & communication | 2026 |
| Merksemd AS | Professional & scientific | 2023 |
| Mets Holding AS | | 2023 |
| Murmester Storesætre AS | Construction | 2021 |
| Njord Aqua AS | Agriculture & fishing | 2015 |
| Nordnes Eigedom AS | Real estate | 1993 |
| Omega Bygg AS | Construction | 2022 |
| Ospedalen Eiendom AS | Real estate | 2024 |
| R Hagen Holding AS | Financial services | 2017 |
| Rajav Holding AS | Wholesale & retail | 2018 |
| Rallaren Eiendom AS | Administrative & support | 2006 |
| Refsnesset AS | Professional & scientific | 2010 |
| Rett I Nebbet AS | Administrative & support | 2024 |
| Rod AS | | 2022 |
| Rosinvt AS | | 2023 |
| Seira Holding AS | | 2024 |
| Sju Med Sindre AS | Information & communication | 2026 |
| Sjurdagarden AS | Real estate | 2012 |
| Skarvatun VVS AS | Construction | 2015 |
| SMM Holding AS | Financial services | 2010 |
| Spar Tysnes AS | Wholesale & retail | 2004 |
| Sundavegen 1 AS | Real estate | 2025 |
| Svein Kongsvik Holding AS | | 2024 |
| Svingen Eiendom Tysnes AS | Real estate | 2024 |
| Svingenpuls AS | Arts & recreation | 2014 |
| T. Tvedt Holding AS | Financial services | 2010 |
| Tiko AS | Construction | 1996 |
| Tiko Eigedom AS | Real estate | 2009 |
| TM Storetvedt AS | Construction | 2025 |
| Treco Bil AS | Other services | 1988 |
| Trond Helland Holding AS | Manufacturing | 2024 |
| Ty Marine Services AS | Agriculture & fishing | 2019 |
| Tysnes Apotek AS | Wholesale & retail | 2022 |
| Tysnes Blomster & Interiør AS | Wholesale & retail | 2011 |
| Tysnes Bolig AS | Real estate | 2007 |
| Tysnes Group AS | Construction | 2011 |
| Tysnes Hus Og Hytte Service AS | Construction | 2017 |
| Tysnes Kraftlag AS | Energy | 1946 |
| Tysnes Kystfiske AS | Agriculture & fishing | 2016 |
| Tysnes Lakk Og Servicesenter AS | Wholesale & retail | 1999 |
| Tysnes Lydutleige Ans | Administrative & support | 2001 |
| Tysnes Næring AS | Real estate | 2013 |
| Tysnes Trygdepensjonat AS | Real estate | 1985 |
| Vajar AS | Construction | 2022 |
| Vest Bygg Entreprenør AS | Construction | 2020 |
| Vest Gruppen AS | Construction | 2016 |
| Vest Marina AS | Wholesale & retail | 2020 |
| VLF Holding AS | | 2024 |
| Våge Hamn AS | Transport & logistics | 2009 |
| Vågen AS | Professional & scientific | 1991 |
| Vågsmarka 7 AS | Real estate | 2025 |
| Øvre Gjerstad Holding AS | | 2025 |