| Soda Eiendom AS | Real estate | 2025 |
| Soh Invest AS | Manufacturing | 2005 |
| Sokalbygget AS | Real estate | 1985 |
| Solberg. AS | Administrative & support | 2018 |
| Solhaug Holding AS | Financial services | 2005 |
| Solhaug Maskin AS | Construction | 2023 |
| Soltun Grendehus Ba | Real estate | 1976 |
| Solums AS | Professional & scientific | 2025 |
| Soria Moria Kultur & Turisme AS | Hospitality | 2006 |
| Sov Invest AS | | 2005 |
| Spaceherder AS | | 2026 |
| SPANIAMEGLER1 AS | Wholesale & retail | 2015 |
| Sparktech Nuf | Manufacturing | 2026 |
| Spera AS | Professional & scientific | 2016 |
| Spinneri AS | Health & social care | 2009 |
| Sprek Trening AS | Arts & recreation | 2003 |
| Sprek Verdal AS | Arts & recreation | 2011 |
| Stall Volhaugen AS | Education | 2024 |
| Stasjonsdrift Holmen AS | Wholesale & retail | 2019 |
| Stein Aksnes Holding AS | | 2012 |
| Stein Arild Risan AS | Construction | 2015 |
| Stekke Eiendom AS | Real estate | 2015 |
| Stekke Legesenter AS | Health & social care | 2011 |
| Stekkstad Holding AS | Hospitality | 2022 |
| Steuker Holding AS | | 2018 |
| Stiklestad Bemanning AS | Administrative & support | 2019 |
| Stiklestad Camping AS | Hospitality | 1995 |
| Stiklestad Golfklubb Klubbhus AS | Real estate | 2004 |
| Stiklestad Gårds- Og Friluftsbarnehage AS | Education | 2008 |
| Stiklestad Hotell AS | Hospitality | 2006 |
| Stiklestad Landbruk AS | Wholesale & retail | 2026 |
| Stiklestad Lyd & Lys AS | Arts & recreation | 2004 |
| Stiklestad Maskinlag SA | Agriculture & fishing | 2013 |
| Stiklestad Snekkerlag Ans | Construction | 1995 |
| Stiklestad Tre AS | Manufacturing | 1998 |
| Stiklestad Østre Holding AS | | 2025 |
| Storholmen Drift SA | Water & waste | 2016 |
| Strandveien Auto Verdal AS | Wholesale & retail | 1984 |
| Strøm Taxi AS | Transport & logistics | 2023 |
| STUDENTINFO Torgersen & Stene | Wholesale & retail | 1986 |
| Studio 2 Dame & Herrefrisør AS | Other services | 1997 |
| Ståle Elnes Transport AS | Transport & logistics | 2020 |
| Ståle Skrove AS | | 2024 |
| Stødig Prosjektering AS | Professional & scientific | 2025 |
| Sulland Verdal AS | Other services | 1996 |
| Sunderland Invest AS | Financial services | 2009 |
| Sunnfornuft Da | Health & social care | 2005 |
| Sustinere Holding AS | | 2018 |
| Sveberg & Gran Holding AS | Real estate | 2007 |
| Sveberg Rør AS | Construction | 1982 |
| Svein Eggen Holding AS | Real estate | 2021 |
| Swerock AS | Mining & quarrying | 2001 |
| Systeminvestering AS | | 2024 |
| Søreng Invest AS | | 2024 |
| Sørfjella Bruksberettigedes Saubeitelag SA | Agriculture & fishing | 2003 |
| Sørskaget Eiendom AS | Real estate | 2017 |
| T-A Storhaug Holding AS | Real estate | 2014 |
| T-E Helgesen AS | Professional & scientific | 2025 |
| T. Lillesand Holding AS | Real estate | 2016 |
| T.Aurstad AS | Construction | 2021 |
| T.Berge Maskin AS | Construction | 2021 |
| T.Bjørk Holding AS | | 2019 |
| T.Hynne Holding AS | | 2024 |
| Takmesteran AS | Construction | 2015 |
| Takst Midt AS | Professional & scientific | 2019 |
| Tannlege Halvor Sørhuus AS | Health & social care | 1996 |
| Tannlege Kjetil Kroglund AS | Health & social care | 2020 |
| Tannlege Trond Sørhuus AS | Health & social care | 2010 |
| Tannlege Walberg AS | Health & social care | 2025 |
| Tannlegene Sørhuus AS | Health & social care | 2003 |
| TB Invest AS | Administrative & support | 2013 |
| Tele-Com Midt-Norge AS | Information & communication | 2011 |
| Telekiosken Verdal AS | Wholesale & retail | 2011 |
| Temo Eiendom AS | Real estate | 2000 |
| Terje Skjevik AS | Professional & scientific | 2017 |
| Tevo Bil Da | Other services | 2002 |
| Tevo Dekk AS | Wholesale & retail | 2003 |
| Tevo Service AS | Administrative & support | 2009 |
| Thingstad Bygg AS | Construction | 2004 |
| Thingstad Holding AS | Construction | 2016 |
| Thoja AS | Wholesale & retail | 2011 |
| Thomar AS | Financial services | 2005 |
| Thomsengården Eiendom AS | Manufacturing | 1974 |
| Thomsengården Hus & Hage AS | Wholesale & retail | 2025 |
| Timetrack AS | Arts & recreation | 2017 |
| Tindslett Eiendom AS | Real estate | 2020 |
| Tindved AS | Professional & scientific | 2004 |
| Tinna Holding AS | Financial services | 2005 |
| Tinna Invest AS | Financial services | 2013 |
| TKV Holding AS | Financial services | 2013 |
| Tllc Invest AS | | 2018 |
| Tmelby AS | | 2026 |
| Tol Holding AS | Real estate | 2017 |
| Ton Eiendom AS | Real estate | 2013 |
| Ton Holding AS | | 2014 |
| Tor Sende Transport AS | Transport & logistics | 2011 |
| Tord Foleson AS | Real estate | 2020 |
| Tord Utvikling AS | Real estate | 2020 |
| Tore Guddingsmo Grus AS | Mining & quarrying | 1989 |
| Tore Wågø Forskaling Og Betong AS | Construction | 2022 |