| Skattendin AS | Professional & scientific | 2013 |
| Skogsbo Invest AS | Real estate | 2006 |
| Skogveien Invest AS | Real estate | 2021 |
| Smeby's AS | Construction | 2012 |
| Små Skritt AS | Health & social care | 2023 |
| Snøpatruljen AS | Administrative & support | 2025 |
| Sofie Ellefsen AS | Real estate | 1934 |
| Soino AS | Professional & scientific | 2026 |
| Soldal Capital AS | | 2023 |
| Solidez AS | Construction | 2022 |
| Sorbus Eiendom AS | Real estate | 2024 |
| Sorbus Prosjekt AS | Real estate | 2026 |
| Soundproof Productions Da | Arts & recreation | 2003 |
| Spikkestadveien 12 AS | Real estate | 2004 |
| Spine AS | Health & social care | 2002 |
| Sponsormegleren AS | Administrative & support | 2018 |
| Stabrun Invest AS | Real estate | 2024 |
| Stereo World AS | | 2026 |
| Studio 5 Dekor AS | Professional & scientific | 1986 |
| Studio Hårfin AS | Other services | 2014 |
| Stuland Prosjekt AS | | 2022 |
| Sulander Yachting AS | Wholesale & retail | 2000 |
| Sundal Invest AS | Financial services | 2001 |
| Sundveien 47 AS | Wholesale & retail | 1992 |
| Surpompen AS | Professional & scientific | 2024 |
| Svein Melby Holding AS | | 2023 |
| Svein Ole Wilsgård Holding AS | | 2023 |
| Svein Persson AS | Financial services | 2005 |
| Sætrang Regnskap AS | Professional & scientific | 1990 |
| Sætre Terrasse Vei Og Avløpslag SA | Real estate | 2022 |
| Søndberg Holding AS | Real estate | 2017 |
| Sørkedalsveien 3 Næring AS | Real estate | 2022 |
| T-2 Holding AS | Real estate | 2010 |
| Tackl AS | Professional & scientific | 2018 |
| Takst Og Bolig AS | Professional & scientific | 2014 |
| Tangram Design AS | Professional & scientific | 2015 |
| Tc-Eiendom AS | Wholesale & retail | 2017 |
| Tcct Holding AS | | 2022 |
| Te Strandos Holding AS | | 2022 |
| Teal Capital AS | | 2025 |
| Tebsene AS | Wholesale & retail | 2016 |
| Teodor AS | Information & communication | 2019 |
| Tetrao AS | | 1937 |
| Thau Reklamebyrå AS | Professional & scientific | 1937 |
| Thedynamics AS | Information & communication | 2007 |
| Thilde Eiendom AS | Real estate | 1988 |
| Thomas Roander Holding AS | Professional & scientific | 2010 |
| Thorkelsson Elektro AS | Construction | 2018 |
| Thorkildsen Holding AS | | 2026 |
| Thorup Design AS | Professional & scientific | 2015 |
| Thorup Holding AS | | 2023 |
| Thstrømsnes Holding AS | | 2026 |
| Tilt Holding AS | Information & communication | 2015 |
| Tilt Norge AS | Information & communication | 2015 |
| Timrehaugen Havn AS | | 2024 |
| Tingeling Holding AS | | 2025 |
| Tito Kapital AS | | 2025 |
| TKH Holding AS | Professional & scientific | 2020 |
| Toftenes Eiendom AS | Real estate | 2005 |
| Tom Elnes Rørleggerforretning AS | Construction | 1980 |
| Tomtebanken 1 AS | Real estate | 2017 |
| Tonning AS | | 2025 |
| Tordensky Holding AS | | 2020 |
| Toverud Eiendom AS | | 2015 |
| Tradedesk AS | Professional & scientific | 2015 |
| Trekanten Eiendom AS | Real estate | 1987 |
| Trepe AS | Real estate | 2009 |
| Trond G Hansen AS | Real estate | 2017 |
| Trude Staalesen AS | Health & social care | 2021 |
| Tryggestad Holding AS | | 2021 |
| Tryggestad Stasjonsdrift AS | Wholesale & retail | 2014 |
| Tryti Holding AS | | 2005 |
| TSP Invest AS | Real estate | 2006 |
| Tujo Ans | Information & communication | 2005 |
| Tveit Eiendom AS | Real estate | 1987 |
| Tyrell Corporation AS | Financial services | 2014 |
| Ubj AS | | 2025 |
| Utleiefirma Pose & Sekk Da | Administrative & support | 2002 |
| V1 Invest AS | Real estate | 2013 |
| Valberg Generator AS | | 2024 |
| Vamoset AS | Information & communication | 2026 |
| Vannperlen AS | Wholesale & retail | 2009 |
| Varde Interiørstudio Lillestrøm AS | Administrative & support | 2025 |
| Varm I Vollen AS | Administrative & support | 2019 |
| Varsla Bygg AS | Wholesale & retail | 1983 |
| Vartdal Solutions AS | Information & communication | 2015 |
| Vatrans AS | Transport & logistics | 2001 |
| Venlifjell Invest AS | Real estate | 1998 |
| Vennelslund AS | Real estate | 2008 |
| Vennely AS | Real estate | 2026 |
| Videntium AS | Information & communication | 2017 |
| Viken Bolig Service AS | Construction | 2023 |
| Vildr AS | Information & communication | 2025 |
| Vinsdal AS | Professional & scientific | 2021 |
| Visnekk AS | Construction | 2015 |
| Visnekk Gruppen AS | Transport & logistics | 2023 |
| Viso AS | Information & communication | 2012 |
| Vital Fungi AS | Agriculture & fishing | 2025 |
| Vivelstadveien 1A AS | Real estate | 2019 |
| Voco AS | Professional & scientific | 2013 |