| Storgata 81 Eiendom AS | Real estate | 2023 |
| Storgata 86 AS | Real estate | 2005 |
| Storgata Eiendom Holding AS | Real estate | 2025 |
| Storgaten 70 AS | Real estate | 2025 |
| Storgaten 92 AS | Real estate | 2013 |
| Stortorget Lillehammer AS | Real estate | 1998 |
| Strada AS | Wholesale & retail | 2011 |
| Strai Kjøkken Lillehammer AS | Wholesale & retail | 2007 |
| Strandpromenaden Motell AS | Hospitality | 2004 |
| Strandtorget Autosenter AS | Wholesale & retail | 2010 |
| Strandum Consulting AS | Professional & scientific | 2023 |
| Strongylus AS | | 2005 |
| Structor Lillehammer AS | Professional & scientific | 2014 |
| Studio Laura Van AS I AS | Professional & scientific | 2020 |
| Stuskin AS | Financial services | 2020 |
| Styrmand AS | Information & communication | 2008 |
| Ståle Lunn Holding AS | | 2026 |
| Sulaymani Transport AS | Transport & logistics | 2023 |
| Sulbu AS | | 2020 |
| Sulland Bilsenter Lillehammer AS | Other services | 2009 |
| Sulland Bilskadesenter AS | Other services | 1990 |
| Sulland Lillehammer AS | Wholesale & retail | 1997 |
| Sungam Holding AS | | 2021 |
| Surveyservice AS | Professional & scientific | 2002 |
| Suttestad Handel AS | Real estate | 2019 |
| Svachris AS | Health & social care | 2012 |
| Svartor Holding AS | Real estate | 2007 |
| Svartskard AS | Real estate | 2018 |
| Svea Bolig AS | Real estate | 2017 |
| Svein Tore Lysgaard AS | Construction | 2008 |
| Svein Tore Lysgaard Holding AS | Real estate | 2024 |
| Svein-Olav Bøen AS | Professional & scientific | 1994 |
| Sverre Lien Transport AS | Transport & logistics | 2012 |
| Svingen Legesenter AS | Health & social care | 2000 |
| SVN 8 AS | Real estate | 2025 |
| Sway Consulting AS | Professional & scientific | 2022 |
| Swig AS | Administrative & support | 2025 |
| Sybutikken Lillehammer AS | Wholesale & retail | 2004 |
| Sygard Fougner Holding AS | Professional & scientific | 2016 |
| Syhema Invest AS | | 2020 |
| Sykkologen AS | Wholesale & retail | 2017 |
| Sylliåsen Invest AS | | 2023 |
| Sylliåsen Prosjektpartner AS | Construction | 2026 |
| Symbion AS | Real estate | 1985 |
| Synlig Bedrift AS | Professional & scientific | 2015 |
| Synsnerven AS | Health & social care | 2025 |
| Sæterdal Holding AS | | 2023 |
| Sæther Fysioterapi AS | Health & social care | 2013 |
| Sætra Islandshester AS | Agriculture & fishing | 2021 |
| Sør - Øst Bygg AS | Real estate | 2010 |
| Sør-Hove Eiendom AS | Real estate | 2004 |
| Sørby Bygg AS | Construction | 2014 |
| Søre Kjos Invest AS | | 2026 |
| Søre Langseth Eiendom AS | Real estate | 2020 |
| Søre Ål Bil AS | Other services | 2025 |
| Søre Ål Eiendom AS | Real estate | 2018 |
| Søre Ål Holding AS | Real estate | 2022 |
| Søre Ål Utvikling AS | Real estate | 2021 |
| T B Eiendom AS | Real estate | 1969 |
| T Belsvik AS | Wholesale & retail | 2021 |
| T J Strand Lillehammer Glassmagasin AS | Wholesale & retail | 1998 |
| T-Ab Holding AS | | 2018 |
| T-T Invest AS | | 2018 |
| T. F. Hovslageren AS | Agriculture & fishing | 2022 |
| T.A.Håndverk Tjenester AS | Construction | 2020 |
| T.Lund Holding AS | Real estate | 2015 |
| Ta Olsen Takst AS | Real estate | 2022 |
| Tamburstuen AS | Construction | 2015 |
| Tamburstuen Holding AS | Construction | 2024 |
| Tande AS | Agriculture & fishing | 2011 |
| Tannhuset Lillehammer AS | Health & social care | 2021 |
| Tannlege Anne Therese Solås AS | Health & social care | 2012 |
| Tannlege Kristin Thorud AS | Health & social care | 2018 |
| Tannlege Lars Nustad AS | Health & social care | 2012 |
| Tannlege Nordblom AS | Health & social care | 2016 |
| Tannlege Ole Johan Hjortdal AS | Health & social care | 2005 |
| Targetone AS | Professional & scientific | 2005 |
| Taste of Bangkok Take Away AS | Hospitality | 2022 |
| Tava Holding AS | | 2024 |
| TBS Holding AS | Real estate | 2005 |
| Tea Lillehammer AS | Hospitality | 2025 |
| Team Riiber Invest AS | Financial services | 2021 |
| Team Tur AS | Information & communication | 2021 |
| Teater Leven Da | Arts & recreation | 1997 |
| Teateret I Berget Det Blå AS | Arts & recreation | 2025 |
| Teip Holding AS | Wholesale & retail | 2020 |
| Tekbit AS | Transport & logistics | 2025 |
| Tendenza AS | Wholesale & retail | 2010 |
| Tendenza Men AS | Wholesale & retail | 2021 |
| Terralgea AS | Wholesale & retail | 2022 |
| Tetøsene AS | Wholesale & retail | 2013 |
| TF Forvaltning Da | Wholesale & retail | 2008 |
| Tfo 386 Holding AS | | 2023 |
| TH Lunde AS | Wholesale & retail | 1990 |
| Thaimassasje Lillehammer AS | Other services | 2021 |
| Tharen Holding AS | | 2020 |
| The Best Choise Ans | Wholesale & retail | 2001 |
| The Company Business AS | | 2024 |
| The Lipp AS | Information & communication | 2016 |
| Thelu Invest AS | Professional & scientific | 2017 |