| Storage AS | Information & communication | 2016 |
| Storengveien 8 Kontor I AS | Real estate | 2012 |
| Storengveien AS | Financial services | 2014 |
| Storyline Coproductions AS | Information & communication | 2008 |
| Storyline Studios AS | Information & communication | 2005 |
| Stranger Things AS | | 2023 |
| Strasias AS | Real estate | 2005 |
| Stubbraaten Consulting AS | Information & communication | 2025 |
| Studio Classic AS | Other services | 2013 |
| Stunjo AS | | 2019 |
| Sudmann Holding AS | Information & communication | 2024 |
| Summab Media AS | Professional & scientific | 2016 |
| Sunhome AS | Professional & scientific | 2017 |
| Sunlark AS | Professional & scientific | 2014 |
| Sunne Organisasjoner AS | Professional & scientific | 2006 |
| Sup Invest AS | | 2014 |
| Susebukta AS | Professional & scientific | 2023 |
| Svae Invest AS | | 1990 |
| Svartdal Design AS | Professional & scientific | 1990 |
| Sveko Invest AS | Real estate | 2006 |
| Svelvik Invest AS | Real estate | 2014 |
| Svelvik Nærsenter AS | Real estate | 2005 |
| Svend Ole Nielsen AS | Health & social care | 2005 |
| SVEST1 Invest AS | Professional & scientific | 2020 |
| Syneco AS | Real estate | 1985 |
| Syntese AS | Professional & scientific | 1989 |
| T&P Bygg AS | Construction | 2020 |
| T.Al. Holding AS | Arts & recreation | 2018 |
| Tact AS | Information & communication | 2005 |
| Tallhode AS | Professional & scientific | 2024 |
| Talo AS | Real estate | 2016 |
| Tannlegene I Jarhuset AS | Health & social care | 2020 |
| Tantalis AS | | 2008 |
| Tasma Invest AS | Financial services | 2015 |
| TCH Invest AS | Financial services | 2017 |
| Tchansen Horizon Holding AS | | 2025 |
| Tefre Invest AS | | 2020 |
| Teige Catering AS | Hospitality | 2025 |
| Tele Broker AS | Wholesale & retail | 1987 |
| Telhaug & Karlsson AS | Professional & scientific | 2013 |
| Terjebo Ltd Nuf | Professional & scientific | 2015 |
| TH. Irby Holding AS | Wholesale & retail | 2005 |
| Thanks to Boredom AS | Information & communication | 2017 |
| Think Protons AS | | 2021 |
| Thirdplace AS | Information & communication | 2025 |
| Thomas Harstad Holding AS | | 2023 |
| Tidale AS | Professional & scientific | 2025 |
| Tigerboy AS | Financial services | 2011 |
| Tigris Invest AS | Real estate | 2026 |
| Tikea Invest AS | Real estate | 2015 |
| Tinka Vekst AS | | 2021 |
| Tivoli Servering AS | | 2026 |
| TJC Reiten AS | | 2025 |
| Tjernet AS | Information & communication | 1986 |
| Tjernsrud Invest AS | Financial services | 2005 |
| TLT Leadership AS | Professional & scientific | 2023 |
| TN Holding AS | Real estate | 2005 |
| Toffy Dynasty AS | | 2026 |
| Togare AS | Financial services | 2017 |
| Tojo Eiendom Og Consult AS | Real estate | 1993 |
| Toka Consult AS | Professional & scientific | 2023 |
| Topco AS | Financial services | 2022 |
| Toppsvill Holding AS | Professional & scientific | 2021 |
| Totalpeis AS | Construction | 2024 |
| TRAINING4FUTURE Da | Professional & scientific | 2009 |
| Tredje Etasje AS | Real estate | 2026 |
| Treningsglede AS | Arts & recreation | 2016 |
| Tress Finans AS | Real estate | 2020 |
| Trinity Group AS | Real estate | 2011 |
| Trioinvest AS | | 2018 |
| Trollstien Syd AS | Real estate | 2022 |
| Trolltind Kommunikasjon AS | Professional & scientific | 1978 |
| Trudvangen AS | Financial services | 2005 |
| TS Invest AS | | 2026 |
| TSN Invest Og Rådgivning AS | Professional & scientific | 2014 |
| Ttem AS | | 2022 |
| Tufto AS | Manufacturing | 2020 |
| Tulipan AS | Water & waste | 2012 |
| Tusleboks AS | | 2021 |
| Tusmørke AS | Arts & recreation | 2014 |
| Tveit Investering AS | Professional & scientific | 2021 |
| Twin Spark AS | Financial services | 1992 |
| Tysfjord AS | Real estate | 2025 |
| Tømrermesterfirmaet Lars Unnli AS | Construction | 1997 |
| Tømmermester Ola Rogn A/S | Construction | 1987 |
| Uim Invest AS | | 2024 |
| Uixly AS | Information & communication | 2026 |
| Ulimoen Holding AS | | 2019 |
| Ultra Medica AS | Wholesale & retail | 2011 |
| Undring AS | Education | 2021 |
| Unib Invest AS | | 2025 |
| Unknown Holding AS | Information & communication | 2020 |
| Unnli Eiendom AS | Real estate | 2008 |
| Unnli Holding AS | Real estate | 2015 |
| Urnes Holdings AS | | 2026 |
| Utla Helse AS | Health & social care | 2026 |
| Vaba AS | Professional & scientific | 2012 |
| Vadnes AS | Professional & scientific | 2016 |
| Vaga Gruppen AS | Professional & scientific | 2016 |
| Valentini AS | | 2018 |