| Robur Safe AS | Wholesale & retail | 1982 |
| ROM4VIN AS | Wholesale & retail | 2021 |
| Roness Helse AS | Education | 2023 |
| Roth Norge AS | Wholesale & retail | 1996 |
| Rpl-Prosjekt AS | Professional & scientific | 2005 |
| Rud Utvikling AS | Real estate | 2020 |
| Rugde Industrier AS | | 2022 |
| Rundfjell AS | Financial services | 2016 |
| Ruseløkkveien 59 Seksjon 2 AS | Real estate | 2025 |
| Rådhuskvartalet Raufoss AS | Real estate | 2025 |
| Rønningen Digital AS | Information & communication | 2017 |
| Rør Og Sanitærutstyr AS | Construction | 2017 |
| S4S Nordic AS | Wholesale & retail | 2014 |
| Sagn Kommunikasjon Og Ledelse AS | Professional & scientific | 2024 |
| Sagu AS | Professional & scientific | 2022 |
| Saltac AS | Information & communication | 2025 |
| Salto Ladestasjoner AS | | 2000 |
| Sandvika Entreprenør AS | Real estate | 2024 |
| Sandvika Ønh-Senter AS | Health & social care | 2026 |
| Sarafine AS | Financial services | 2013 |
| Saturn V AS | | 2021 |
| Sauer Invest AS | | 2024 |
| Savant AS | Professional & scientific | 2012 |
| Schultz Gate 2 AS | Real estate | 2022 |
| Schøning-Kristiansen AS | Wholesale & retail | 2014 |
| Scuderia Nord AS | Other services | 2006 |
| Seadream AS | Real estate | 2006 |
| Seadream Yacht Club AS | Real estate | 1995 |
| Seadream Yacht Club Ltd | Transport & logistics | 2004 |
| Seadream Yacht Club Management AS | Transport & logistics | 2001 |
| Seadream Yachts AS | Administrative & support | 2001 |
| Seadream Yachts III AS | Real estate | 2026 |
| Seawiz AS | Transport & logistics | 2022 |
| Seil & Motor AS | Information & communication | 2005 |
| Seldal Bakke Holding AS | | 2016 |
| Semear AS | Professional & scientific | 2021 |
| Sero AS | Manufacturing | 1963 |
| Setsaas Rekruttering AS | Professional & scientific | 2018 |
| Sgbb AS | | 2021 |
| Shahan Service AS | Professional & scientific | 2022 |
| She Slependen AS | Real estate | 1994 |
| Shealtech AS | Professional & scientific | 2019 |
| Sigma Systemer AS | Professional & scientific | 2005 |
| Sine Holding AS | | 2021 |
| Sintra Forvaltning AS | Information & communication | 2000 |
| Siv Ing Nils Hjorthol AS | Professional & scientific | 1994 |
| Siv. Ing. Maxwell Entreprenør AS | Real estate | 2025 |
| Sivilingeniørene Stensaker AS | Professional & scientific | 2000 |
| Sjøengen Kro AS | Hospitality | 2015 |
| Skate AS | | 2022 |
| Skeidanger AS | | 2024 |
| Skoggata Utvikling AS | Real estate | 2015 |
| Skogs & Kemi HBG AB | Agriculture & fishing | 1998 |
| Skolemagasinet AS | Education | 2007 |
| Skulberg Holding AS | | 2022 |
| Slaatsveen Consulting AS | Professional & scientific | 2018 |
| Slependen Båtplass SA | Other services | 1970 |
| Slependveien 55 AS | Construction | 2021 |
| Slevik Invest AS | | 2025 |
| Smea Consult AS | Professional & scientific | 2015 |
| Snelledalen AS | Wholesale & retail | 2008 |
| Snowman AS | | 1998 |
| Sofienberg Gruppen AS | Real estate | 2013 |
| Sofienberg Invest AS | Real estate | 2019 |
| Sofienberg Rør Og Varme AS | Construction | 2023 |
| Sogelink Norway AS | Information & communication | 2021 |
| Solbråveien 10 AS | Real estate | 2022 |
| Solbråveien 20 AS | Real estate | 2002 |
| Solbråveien AS | Real estate | 2016 |
| Solvik Holding AS | Real estate | 2005 |
| Sonhuis AS | Wholesale & retail | 2018 |
| Spjelkevik Holding AS | | 2025 |
| SPK Invest AS | Financial services | 2016 |
| Sporveisgt 27 AS | Real estate | 2007 |
| Sru 093 Holding AS | | 2023 |
| Sseapro Solutions AS | Professional & scientific | 2018 |
| ST Eiendom AS | Real estate | 1986 |
| Stasjonsveien 44 AS | Real estate | 1983 |
| Stein Vikan Og Ole Grangaard Ans | Real estate | 2010 |
| Stikkerne AS | Professional & scientific | 2024 |
| Stjerna Holding AS | | 2024 |
| Stor-Oslo Bruktbil AS | Wholesale & retail | 2016 |
| Stormåsan Lager AS | Real estate | 2016 |
| Strømstad Handelspark AS | Real estate | 2010 |
| Strømsveien 303 AS | Wholesale & retail | 2006 |
| Stubbengkroken 73 AS | Real estate | 2021 |
| Stålfjæra 12 Oslo AS | Real estate | 2023 |
| Summiteer AS | Financial services | 2016 |
| Svang Eiendom AS | Real estate | 1994 |
| Sveinja Invest AS | Administrative & support | 1981 |
| Swan Advokater Da | Professional & scientific | 2014 |
| SWN AS | | 2015 |
| Syningom AS | Professional & scientific | 2010 |
| Sætre Havn Utvikling 2 AS | Real estate | 2018 |
| Sætre Havn Utvikling 3 AS | Real estate | 2020 |
| Sørlandsidyllen AS | Real estate | 2005 |
| Søster Holding AS | Wholesale & retail | 2023 |
| T.A. Agnæss Holdings AS | Real estate | 2005 |
| T.A.F. Eiendom AS | Real estate | 2011 |
| T.A.F. Holding AS | Wholesale & retail | 2005 |