| Stårri AS | Ålesund | 2023 |
| Stæntrølle AS | Hunndalen | 2019 |
| Stærk & Co AS | Arendal | 2018 |
| Stærk Holding AS | Tromsø | 2008 |
| Stærkeby Takst AS | Drammen | 2009 |
| Stø Technology AS | Ålesund | 2021 |
| Stødi Byggconsult AS | Mo I Rana | 2018 |
| Stødig AS | Kråkerøy | 2015 |
| Stødig Partner AS | Tromsdalen | 2022 |
| Stødig Prosjektering AS | Verdal | 2025 |
| Stødle AS | Kristiansand S | 2021 |
| Støkurs-Rom for Retning AS | Skjoldastraumen | 2026 |
| Støle Invest AS | Lørenskog | 2022 |
| Stølvarlia Invest AS | Førde | 2001 |
| Støre Arkitekter AS | Oslo | 2015 |
| Støre Holding AS | Oslo | 1998 |
| Støre Ventures AS | Drøbak | 2022 |
| Støren Dyreklinikk AS | Støren | 2008 |
| Støren Veterinærkontor AS | Støren | 2010 |
| Størmer Mur & Bygg AS | Oslo | 2021 |
| Støttebein AS | Oslo | 2026 |
| Støttt AS | Oslo | 2019 |
| Støvland AS | Larvik | 2020 |
| Støvland Holding AS | Larvik | 2015 |
| Støwer AS | Buvika | 2019 |
| Støyklar Akustikk AS | Husøysund | 2025 |
| Støyva Holding AS | Porsgrunn | 2017 |
| Su Consulting AS | Berger | 2016 |
| Sub Mare Tech AS | Stavanger | 2015 |
| Suballiance | 69320 Feyzin | 2011 |
| Subc Holding AS | Straume | 2007 |
| Subc Solutions AS | Straume | 2007 |
| Subc Technology AS | Straume | 2008 |
| SUBC3D AS | Haugesund | 2016 |
| Subcom AS | Røyneberg | 2008 |
| Subcpartner | Dk-6700 Esbjerg | 2013 |
| Subcurrent AS | Godvik | 2025 |
| Subeno India Private Limited | In-Andhra Pradesh 533005 | 2024 |
| Subex AS | Kristiansund N | 2026 |
| Subgas Limited | Aberdeen Ab15 8Pz | 2019 |
| Subject Aid AS | Oslo | 2007 |
| Sublim-Z AS | Skallestad | 2011 |
| Sublime Media AS | Oslo | 2014 |
| Sublime Performance AS | Ås | 2018 |
| Submara Survey AS | Stryn | 2016 |
| Submare AS | Stavanger | 2015 |
| Submatech AS | Mandal | 2013 |
| Submerged AS | Stadsbygd | 2018 |
| Submersible Technology Services AS | Bergen | 1990 |
| Subsea & Oilfield Services International AS | Fannrem | 2024 |
| Subsea & Topside Consultant AS | Sandnes | 2013 |
| Subsea 7 Deep Sea Ltd | Aberdeenshire Ab32 6Fe Scottland | 2026 |
| Subsea 7 Engineering Ltd | Surrey Sm2 Bn, Ab32 6Fe | 2025 |
| Subsea 7 I-Tech Limited Nuf | Aberdeenshire Ab32 6Fe | 2016 |
| Subsea 7 Rov UK Limited Nuf | Stavanger | 2026 |
| Subsea Alba Limited | Isle Of Lewis Hs1 2Dz | 2012 |
| Subsea and Hydraulics Ltd | Durham Dl3 7Eh | 2019 |
| Subsea Assist AS | Vega | 2025 |
| Subsea Bellows AS | Tønsberg | 2022 |
| Subsea Competence Group AS | Bergen | 2010 |
| Subsea Consulting AS | Hafrsfjord | 1993 |
| Subsea Engineering Aberdeen Limited | Aberdeenshire Ab21 0Ae Scotland | 2019 |
| Subsea Engineers Limited Nuf | Im9 5Eu Isle Of Man | 2025 |
| Subsea Enterprises AS | Hvalstad | 2006 |
| Subsea Farming AS | Oslo | 2017 |
| Subsea Innovation Limited | County Durham Dl3 0Ur | 2013 |
| Subsea Installer AS | Sandvika | 2012 |
| Subsea Integrity Consulting Ltd | Glasgow G3 6Aa Scotland | 2015 |
| Subsea Marintech AS | Sagvåg | 2005 |
| Subsea Metrics LLC | 44052 Lorain, Oh | 2023 |
| Subsea Oil Solutions AS | Drammen | 2012 |
| Subsea Optimizers LLC | Fort Lauderdale, Fl 33312 | 2020 |
| Subsea Projects (UK) Ltd | Yo30 1Ag York | 2015 |
| Subsea Provider AS | Stavanger | 2023 |
| Subsea Rider Ltd | Eurotowers Gx11 1Aa | 2023 |
| Subsea Robotics AS | Grimstad | 2022 |
| Subsea Services Solutions Ltd | Dunblane Fk15 9Db Scotland | 2020 |
| Subsea Solutions Partner AS | Sandvika | 2011 |
| Subsea Systems AS | Tertnes | 2005 |
| Subsea Technical & Safety Services Ltd | Antrim Bt54 6Bu | 2020 |
| Subsea Technical Services (UK) Ltd | Gb-Hampshire Rg21 5Th | 2017 |
| Subsea Technology & Rentals Norway AS | Åkrehamn | 2024 |
| Subsea Technology and Rentals Ltd | Aberdeen Ab12 3Lh Scotland | 2016 |
| Subsea Technology AS | Oslo | 1996 |
| Subsea Tjenester AS | Ulset | 2007 |
| Subsea Wellpartner AS | Stavanger | 2019 |
| Subsea Wellpartner Contracting Ltd | Aberdeen Ab11 6Yw Scotland | 2016 |
| Subsea Works Ltd | Aberdeen Ab15 8Qj Scotland | 2017 |
| Subseacomm AS | Mosjøen | 2013 |
| Subseadesign AS | Lier | 2020 |
| Subsealink AS | Stavanger | 2014 |
| Subseapilot Nuf | Gressvik | 2024 |
| Subseaquence Ltd | Kent Da5 1Lr England | 2018 |
| Subsearemote AS | Gamle Fredrikstad | 2025 |
| Subshore AS | Stavanger | 1998 |
| Subspection Limited | Hampshire So24 0 Qe | 1995 |
| Substans AS | Nesttun | 2016 |
| Substans Management&Consulting AS | Kristiansand S | 2014 |
| Substrata AS | Jakobsli | 2016 |
| Subsurface AS | Tananger | 2015 |