| Seos Holding AS | | 2019 |
| Servicegrossisten Nord AS | Wholesale & retail | 2022 |
| Shades Ans | Arts & recreation | 2021 |
| Shanley Electrical Contractors Limited | Construction | 2008 |
| Sichuan Road & Bridge (Group) Corporation Ltd. Nuf | Construction | 2014 |
| Sigge AS | Real estate | 2024 |
| Signalco-Nord AS | Wholesale & retail | 2007 |
| Sigve Stokland AS | Professional & scientific | 2006 |
| Sigøynerfamilien AS | | 2024 |
| Simonsen Og Sånt AS | Construction | 2023 |
| Sintef Narvik AS | Professional & scientific | 1991 |
| Site Mgmt International AS | Professional & scientific | 2023 |
| Sivilingeniør Guttorm Ræder AS | Financial services | 2013 |
| Sivilingeniør Knutson AS | Professional & scientific | 2018 |
| Sivilingeniør Terje Ivar Ingebrigtsen AS | Financial services | 2013 |
| Sivilingeniør Trond Mikaelsen AS | Financial services | 2013 |
| Sjøveien Eiendom AS | Real estate | 2025 |
| Skala Industri AS | Manufacturing | 2020 |
| Skarberget Brygger AS | Real estate | 2025 |
| Skarsfjord Drift AS | Administrative & support | 2025 |
| Skarvenesveien 3 AS | Real estate | 2023 |
| Skarvenesveien 3 Eiendom Ans | Real estate | 2002 |
| Skarvenesveien 6 AS | Real estate | 2006 |
| Skavik AS | Wholesale & retail | 2021 |
| Skavik Holding AS | Professional & scientific | 2017 |
| Skeidar Narvik AS | Wholesale & retail | 2004 |
| Skinboost AS | Other services | 2018 |
| Skistua Bolig AS | Real estate | 2012 |
| Skistua Eiendommer AS | Real estate | 2020 |
| Skistua Handelseiendom Narvik AS | Real estate | 2011 |
| Skjomen Eiendom AS | Real estate | 2017 |
| Skjomen Hideaway AS | Real estate | 2026 |
| Sklitur AS | Real estate | 2020 |
| Sko+Sånt AS | Wholesale & retail | 2006 |
| Skog Og Villmark AS | Agriculture & fishing | 2020 |
| Skogsbilveilaget Ytre Sommerseth SA | Real estate | 2020 |
| Sky Fuel Lofoten AS | Wholesale & retail | 2025 |
| Skålvold Eiendom AS | Real estate | 1997 |
| Sleep Scandinavia AS | Wholesale & retail | 2005 |
| Sleggesvingen 15 AS | Real estate | 2007 |
| Sletteng Holding AS | | 2021 |
| Slush AS | Real estate | 2023 |
| Smaksrik Catering AS | Hospitality | 2025 |
| SMT Eiendom AS | Real estate | 2025 |
| Småjobba AS | Information & communication | 2026 |
| Smørblomst AS | Real estate | 2024 |
| Snajdder AS | Education | 2025 |
| Snefjellåkraft AS | Energy | 2010 |
| Snekkermester Viggo Remman AS | Construction | 2022 |
| Snorres Gate 21 Narvik AS | Real estate | 2022 |
| Sofri AS | Financial services | 1999 |
| Sokrates Eiendom AS | Real estate | 1998 |
| Solbakken Gård Nygård Da | Agriculture & fishing | 2024 |
| Solbes AS | Professional & scientific | 2011 |
| Solinor Teknologi AS | Professional & scientific | 2025 |
| Solsida Holding AS | Real estate | 2020 |
| Sommereiendom Holding AS | Real estate | 2006 |
| Sonja Blomster AS | Wholesale & retail | 1998 |
| Soria Moria Studentbarnehage AS | Education | 2022 |
| Sparebanken Narvik | Financial services | 1903 |
| SPC Holding AS | | 2015 |
| Spenning Eiendom AS | Real estate | 1989 |
| Sport 1 Narvik AS | Wholesale & retail | 2019 |
| Sportcentret AS | Wholesale & retail | 2015 |
| SPX AS | Administrative & support | 2021 |
| SSJ Eiendom AS | Wholesale & retail | 2003 |
| Stefan Hartsieker Transport Nuf | Transport & logistics | 2009 |
| Steinbra Eiendom AS | Real estate | 1999 |
| Steinovnsbakeriet Myklevold AS | Wholesale & retail | 2007 |
| Stelius AS | | 2026 |
| Stetind Eiendom AS | Real estate | 2020 |
| Stetinden Prosjekter AS | Real estate | 2021 |
| Stihan Holding AS | | 2019 |
| Storforshei Naturkraft AS | Energy | 2002 |
| Storgata 18 Finnsnes AS | Real estate | 2021 |
| Strømme & Rasmussen Da | Other services | 1996 |
| Sunshine Renhold AS | Administrative & support | 2000 |
| Superpål AS | | 2024 |
| Sushi Lab AS | Transport & logistics | 2025 |
| Svarta Bjørn AS | Manufacturing | 2025 |
| Svebjørn Auto AS | Other services | 1989 |
| Svebjørn Bilutleie AS | Administrative & support | 2025 |
| Svensken Kiosk Da | Wholesale & retail | 2001 |
| Svinøya 32 AS | Real estate | 2018 |
| Syglede AS | Wholesale & retail | 2020 |
| Sykehusveien 3 AS | Real estate | 2021 |
| Tairo AS | Information & communication | 2025 |
| Tak & Fasade AS | Construction | 2009 |
| Takster Og Skjønn AS | Professional & scientific | 2003 |
| Talentmatch AS | Professional & scientific | 2025 |
| Tanntorvet Klinikk AS | Health & social care | 2021 |
| Tao Holding AS | Professional & scientific | 2005 |
| Taraldsvik AS | Construction | 2010 |
| Taraldsvik Maskin AS | Construction | 1997 |
| Taraldsvik Services AS | Administrative & support | 2015 |
| Taru Eiendom AS | Real estate | 2025 |
| TBS Eiendom AS | Real estate | 2004 |
| TBS Invest AS | Real estate | 2005 |
| Tdalbu AS | | 2024 |
| Teglverksveien 17 AS | Real estate | 2021 |