| Splendid Group Oy | Wholesale & retail | 2018 |
| Splunk Services Sweden AB, Suomen sivuliike | Information & communication | 2019 |
| Sponsorio Oy | Professional & scientific | 2016 |
| Sport On - Sportia Hämeenlinna Ky | Wholesale & retail | 1988 |
| Sport Studio Helsinki Oy | Arts & recreation | 2021 |
| SportsBar Group oy | Hospitality | 2022 |
| Spot Salon Oy | Information & communication | 2021 |
| Spray-Liner Scandinavia Oy | Construction | 2013 |
| Sproutverse Oy | Professional & scientific | 2019 |
| SpudFin OY | Hospitality | 2025 |
| Square VN Investment & Management Oy | Professional & scientific | 2017 |
| Stack Tech Oy | Information & communication | 2024 |
| Stadin Mustavalkoinen Oy | Professional & scientific | 2010 |
| Stadin Saneeraus Oy | Professional & scientific | 2021 |
| Stadin kiinteistöpalvelu Oy | Real estate | 2023 |
| Stadion Catering Oy | Manufacturing | 2001 |
| Stafe OY | Wholesale & retail | 2022 |
| Stall Harmony Horse Oy | Agriculture & fishing | 2020 |
| Stand City Oy | Education | 2021 |
| Standby-Go OY | Professional & scientific | 2019 |
| Star Ace Limited Oy | Real estate | 2015 |
| Star Solutions Oy | Information & communication | 1986 |
| Star industries Oy | Wholesale & retail | 2001 |
| Starax Oy | Professional & scientific | 2020 |
| Startist Oy | Education | 1993 |
| Starx Oy | Construction | 2018 |
| Steda Oy | Administrative & support | 2022 |
| SteelDeal Oy | Wholesale & retail | 2017 |
| Stellaria Oy | Hospitality | 1992 |
| Stenu Oy | Wholesale & retail | 1998 |
| Sterly Oy | Professional & scientific | 2020 |
| StevNer Oy | Other services | 2024 |
| Stocbud Meiku Oy | Wholesale & retail | 2021 |
| Stockend Oy | Wholesale & retail | 2024 |
| Stone Creative Oy | Arts & recreation | 2022 |
| Stonevan Oy | Construction | 2012 |
| Story of Roo Oy | Wholesale & retail | 2016 |
| StoryTold Oy | Manufacturing | 2021 |
| Street Food & Co Oy | Hospitality | 2020 |
| Strength & Rehab Unit Oy | Health & social care | 2021 |
| Strong Cap Oy | Financial services | 2013 |
| Structor Group Oy | Professional & scientific | 1986 |
| Studio Bodin Oy | Professional & scientific | 2022 |
| Studio Jorma Keränen Oy | Professional & scientific | 1996 |
| Studio Taiga Oy | Other services | 2024 |
| Studio Valen Oy | Arts & recreation | 2022 |
| Studio1337 Oy | Other services | 2017 |
| Subedi MB Oy | Hospitality | 2016 |
| Suka Pojat OY | Construction | 2018 |
| Sukisuki Oy | Water & waste | 2024 |
| Summani Oy | Professional & scientific | 2019 |
| Sumu Seeds Oy | Wholesale & retail | 2020 |
| Sun Solar Oy | Wholesale & retail | 2017 |
| SunParkki Oy | Transport & logistics | 2025 |
| Sunkirppis Oy | Wholesale & retail | 2019 |
| Sunoi Oy | Manufacturing | 2020 |
| Sunrise Finland Oy | Financial services | 2025 |
| Suoja Consulting Oy | Education | 2024 |
| Suola ja Sokeri Oy | Health & social care | 2023 |
| Suomalainen HANSE YEAMIE Tuotemerkin Hallinta Oy | Wholesale & retail | 2019 |
| Suomalainen Sindibad Oy | Hospitality | 2018 |
| Suomen Aurinkoenergiaratkaisut Oy | Construction | 2023 |
| Suomen Autokoripaja Oy | Other services | 2019 |
| Suomen Autokunkku Oy | Wholesale & retail | 2023 |
| Suomen Dataturva Oy | Information & communication | 2015 |
| Suomen Ekoneliöt oy | Construction | 2012 |
| Suomen Helppo kierrätys Oy | Wholesale & retail | 2021 |
| Suomen Ideavarasto Oy | Arts & recreation | 2016 |
| Suomen Interator Oy | Information & communication | 2001 |
| Suomen Juhlamakeiset Oy | Wholesale & retail | 1993 |
| Suomen Kalustekunnostus Oy | Other services | 2021 |
| Suomen Kauppatarvike SKT Oy | Wholesale & retail | 1999 |
| Suomen Kimppataksi Oy | Transport & logistics | 2004 |
| Suomen Kivirakenteet OY | Construction | 2020 |
| Suomen Kone ja Hybridi Oy | Wholesale & retail | 2021 |
| Suomen Konepalvelu Oy | Administrative & support | 2021 |
| Suomen Kulta Outlet Oy | Wholesale & retail | 2011 |
| Suomen Laatusuoja Oy | Wholesale & retail | 2023 |
| Suomen Liiketoimintakehitys Oy | Professional & scientific | 2021 |
| Suomen Luonnonmaalit Oy | Wholesale & retail | 2016 |
| Suomen Lämpö Oy | Construction | 2016 |
| Suomen Lämpöputki Oy | Construction | 2017 |
| Suomen Magneettimestarit Oy | Information & communication | 2019 |
| Suomen Mercus Oy | Wholesale & retail | 1994 |
| Suomen Muovivarikko Oy - Plastic Depot Finland Ltd | Manufacturing | 1994 |
| Suomen Paras Gelato Oy | Hospitality | 2021 |
| Suomen Pelitietokoneet Oy | Wholesale & retail | 2024 |
| Suomen Pientalo-osat Oy | Construction | 1998 |
| Suomen Puuveneosuuskunta | Arts & recreation | 2019 |
| Suomen Rakennus Group Oy | Construction | 2008 |
| Suomen Steel Body Oy | Wholesale & retail | 1995 |
| Suomen Talouudistus Oy | Construction | 1985 |
| Suomen Tehosiivouspörssi Oy | Administrative & support | 2021 |
| Suomen Termo Eristeet Oy | Manufacturing | 2007 |
| Suomen Tukkinosto Oy | Water & waste | 2011 |
| Suomen Verkonrakennustarvike Oy | Wholesale & retail | 2015 |
| Suomen Yksittäishyväksyntä Palvelu Oy | Professional & scientific | 2015 |
| Suomen kevytperävaunujen Turvatarkastus OY | Professional & scientific | 2019 |
| Suomen Öljykierrätys Oy | Water & waste | 2013 |
| Suomen-ID Oy | Other services | 2021 |