| SNJ Bygg & Montasje AS | Heimdal | 2025 |
| SNK AS | Flateby | 2015 |
| Snog AS | Vågå | 2002 |
| Snor AS | Lindesnes | 2009 |
| Snor-Rett AS | Årnes | 2024 |
| Snorre Bygg Da | Kristiansand S | 1994 |
| Snåsa Entreprenør AS | Snåsa | 1991 |
| Snøhetta Anlegg AS | Dombås | 2022 |
| Snøhetta Holding AS | Dombås | 2022 |
| Snøtt AS | Svene | 2025 |
| Snøås Holding AS | Sannidal | 2021 |
| So Anlegg AS | Arendal | 1998 |
| So Holding Og Invest AS | Alta | 2019 |
| So Lund AS | Åkrehamn | 2024 |
| So-Bygg AS | Lillehammer | 2021 |
| So-El Holding AS | Tvedestrand | 2017 |
| So. Ve. S.R.L. | It-30020 Torre De Moste (Ve) | 2019 |
| Soah AS | Sogndal | 2019 |
| Sob Eiendom AS | Hemsedal | 2014 |
| Sobol Bygg AS | Sandefjord | 2019 |
| Sociedad Ibérica De Construcciones Eléctricas S.A. Nuf | Es-28108 Alcobendas, Madrid | 2021 |
| Societe Internationale Des Moteurs Baudoin | Fr-13260 Cassis | 2026 |
| Sofienberg Rør Og Varme AS | Billingstad | 2023 |
| Sogn Alu Design AS | Vang I Valdres | 2021 |
| Sogn Anlegg AS | Vik I Sogn | 2018 |
| Sogn Anleggstjenester AS | Kaupanger | 2022 |
| Sogn Brannsikring AS | Fardal | 2026 |
| Sogn Bygg AS | Sørbøvåg | 2005 |
| Sogn Bygg Og Anlegg AS | Sogndal | 2025 |
| Sogn Elektro AS | Kaupanger | 2013 |
| Sogn Entreprenør AS | Gaupne | 2007 |
| Sogn Kjøleservice AS | Kaupanger | 1996 |
| Sogn Kran AS | Årdalstangen | 1999 |
| Sogn Kran Eigedom AS | Årdalstangen | 2007 |
| Sogn Kran Og Transport AS | Årdalstangen | 2007 |
| Sogn Minihus AS | Kaupanger | 2022 |
| Sogn Mur & Flisservice AS | Sogndal | 1995 |
| Sogn Og Fjordane Bygg AS | Sogndal | 2012 |
| Sogn Røyr AS | Leikanger | 2006 |
| Sogn Samspel AS | Kaupanger | 2025 |
| Sogn Service Drift AS | Oslo | 2019 |
| Sogn Service Holding AS | Oslo | 1997 |
| Sogn Snikkarlag AS | Sogndal | 2022 |
| Sogn Tavle - Og Datamontering AS | Leikanger | 1986 |
| Sogn Varme Og Piperehabilitering AS | Sogndal | 2007 |
| Sogn Vegteneste AS | Sogndal | 2022 |
| Sogndalstrand Undervannstjeneste AS | Hauge I Dalane | 2021 |
| Sognehus AS | Kaupanger | 2012 |
| Sognesjø Holding AS | Søreidgrend | 2005 |
| Soka Invest AS | Lierskogen | 2016 |
| Sokna Elektro AS | Soknedal | 2016 |
| Sokna Elektro Holding AS | Soknedal | 2016 |
| Sokna Rør AS | Soknedal | 2022 |
| Sokna VVS Nuf | Sokna | 2010 |
| Soknedal Maskin Og Transport AS | Soknedal | 2023 |
| Soknedal Næringspark AS | Soknedal | 2020 |
| Sol & Skygge Limited Nuf | Fjellhamar | 2009 |
| Sol - Invest AS | Forsand | 1982 |
| Sol Invest AS | Hommelvik | 2020 |
| Sol Maskin AS | Sandefjord | 2024 |
| Sol Orkan AS | Rolvsøy | 2024 |
| Sol-Vest AS | Os | 2024 |
| Sola Blikk AS | Ræge | 1992 |
| Sola Bygg AS | Sola | 2009 |
| Sola Byggtjenester AS | Sola | 2020 |
| Sola Elektro AS | Sola | 2020 |
| Sola Gulv AS | Sandnes | 2009 |
| Sola Kjøleservice AS | Ræge | 2017 |
| Sola Mur AS | Figgjo | 2018 |
| Sola Parkettsliperi AS | Tananger | 2021 |
| Sola Rør AS | Sola | 2024 |
| Sola Varmepumpe Service AS | Kjøpmannskjær | 2024 |
| Solafabrikken AS | Tjodalyng | 2007 |
| Soland Invest AS | Sarpsborg | 2005 |
| Solar Eliten Norge AS | Mjølkeråen | 2023 |
| Solar Energy AS | Oslo | 2020 |
| Solares AS | Haugesund | 2023 |
| Solarpark | Dk-6240 Løgumkolster | 2024 |
| Solas Elektro AS | Lunde | 2025 |
| Solax Holding AS | Flekkerøy | 2005 |
| Solbakk Bygg Og Vedlikehold AS | Mjølkeråen | 2016 |
| Solbakken 360 AS | Frogner | 2018 |
| Solbakken Anlegg AS | Tromsdalen | 2019 |
| Solbakken Betong AS | Tofte | 2016 |
| Solbakken Blikk AS | Sandnes | 2016 |
| Solbakken Eiendom, Flis Og Betong AS | Sveio | 2015 |
| Solberg Aluminium AS | Leirsund | 1998 |
| Solberg Anlegg AS | Kjerrgarden | 1979 |
| Solberg AS | Valestrandsfossen | 2025 |
| Solberg Bygg & Service AS | Kirkenær | 2025 |
| Solberg Byggservice AS | Tønsberg | 2025 |
| Solberg Deponi AS | Tiller | 2023 |
| Solberg Eiendom & Invest AS | Fetsund | 2005 |
| Solberg El-Service AS | Slinda | 2013 |
| Solberg Elektro AS | Oslo | 2002 |
| Solberg Elektroinstallasjon AS | Brumunddal | 1989 |
| Solberg Forskaling AS | Kleppestø | 2025 |
| Solberg Glass AS | Vøyenenga | 2013 |
| Solberg Gulv Industribelegg AS | Rolvsøy | 1988 |
| Solberg Hage & Anlegg AS | Råde | 2015 |