| Ryhmis Pikkutassu Avoin yhtiö | Education | 2007 |
| Ryhmäperhepäiväkoti Helmiportti, avoin yhtiö | Education | 2015 |
| Ryhmäperhepäiväkoti Ikiliikkujat Oy | Education | 2019 |
| Ryhmäperhepäiväkoti Metsätähti Avoin yhtiö | Education | 2010 |
| S&S Kinnunen Oy | Real estate | 2023 |
| SC Rouhee Oy | Arts & recreation | 2025 |
| SH Klapi ja kone Oy | Agriculture & fishing | 2025 |
| SISOL Oy | Wholesale & retail | 2010 |
| SMLatvakoski Oy | Manufacturing | 2021 |
| SPM Group Oy | Construction | 2015 |
| Saaren Autohuolto Oy | Other services | 2018 |
| Sagro Oy | Construction | 2019 |
| Sahra-Talli Oy | Arts & recreation | 2008 |
| Salanssi Oy | Construction | 2023 |
| Salaojapalvelu Savola Oy | Construction | 1980 |
| Salmela Solutions Oy | Information & communication | 1994 |
| Salom Oy | Manufacturing | 2020 |
| Sampro Innovations Oy | Information & communication | 2024 |
| Sarica Trading Oy | Wholesale & retail | 1993 |
| Savarin Autohuolto Oy | Other services | 2017 |
| Savarin Varaosa Oy | Wholesale & retail | 2020 |
| Savur Kebab Oy | Hospitality | 2023 |
| Scanfori Oy | Financial services | 2021 |
| Semecon Oy | Professional & scientific | 2018 |
| Seravia Oy | Education | 2025 |
| Sesipuu Oy | Administrative & support | 1997 |
| SevenHeaven AI Oy | Information & communication | 2025 |
| Sievin Kaluste Oy | Manufacturing | 1986 |
| Silvan Rauta Oy | Wholesale & retail | 2025 |
| Silver Fields Oy | Manufacturing | 2025 |
| Simonen Holding Oy | Financial services | 2026 |
| Sisuta Oy | Administrative & support | 2020 |
| Skissi Oy | Professional & scientific | 2023 |
| Solarsepät Oy | Construction | 2020 |
| Solart Ky | Professional & scientific | 2006 |
| Solofor Oy | Manufacturing | 2007 |
| SonjaCamillaBooks Oy | Arts & recreation | 2026 |
| Sport Huoltokeskus Oy | Other services | 1989 |
| Suomen Havupuu Oy | Real estate | 1999 |
| Suomen Johdannaismarkkinat Oy | Financial services | 1998 |
| Suomen Ostosparatiisi Ky | Wholesale & retail | 1988 |
| Suomen Puu Oy | Agriculture & fishing | 2023 |
| Suomen Vaskisepät Oy | Construction | 2020 |
| Suomi Trading Oy | Wholesale & retail | 2019 |
| Suoppari Oy | Real estate | 1992 |
| Suunnittelu Laukka Oy | Professional & scientific | 1991 |
| Suunnittelu RakIN Oy | Professional & scientific | 2020 |
| Sykkeliakut Oy | Manufacturing | 2021 |
| Syytec Oy | Manufacturing | 2024 |
| Syötteen Aihki Oy | Real estate | 2005 |
| Sähköliike M & T Oy | Construction | 2014 |
| T&E Rahja Oy | Agriculture & fishing | 2025 |
| T. Kaarlela Ky | Other services | 1989 |
| THIRD HANDS Oy | Other services | 2018 |
| THS-Yhtiöt Oy | Real estate | 2025 |
| TJ Monipalvelu Ky | Administrative & support | 2008 |
| TM Events OY | Arts & recreation | 2022 |
| TPP Kokko Oy | Construction | 2007 |
| TT-Hitsi Oy | Manufacturing | 2014 |
| Taberna Nova Oy | Administrative & support | 2017 |
| Taivaallinen Rauha Tian An Oy | Hospitality | 2008 |
| Taksi P. Pahkala Oy | Transport & logistics | 2021 |
| Taksiliikenne Koskela Oy | Transport & logistics | 2024 |
| Taksiway Oy | Transport & logistics | 2023 |
| Tarinamaailma avoin yhtiö | Education | 2017 |
| Tarsus Oy | Wholesale & retail | 1990 |
| Team Saurento avoin yhtiö | Transport & logistics | 2024 |
| Teksa MSI Oy | Wholesale & retail | 2023 |
| Tekstiimi Oy | Manufacturing | 2012 |
| Tellervo Maa 2 Oy | Agriculture & fishing | 2024 |
| Tellervo Maa Pro Mark 1 Oy | Agriculture & fishing | 2023 |
| Terapiapalvelut Saari Oy | Health & social care | 2025 |
| TerraNova, Avoin yhtiö | Construction | 2013 |
| Testimylly Oy | Real estate | 2020 |
| Tieurakointi MS Oy | Construction | 2010 |
| Tiililä-Invest Oy | Real estate | 2017 |
| Tili- ja Isännöitsijätoimisto O. Ojanperä Ky | Real estate | 1989 |
| Tiliksinet Oy | Real estate | 1994 |
| Tilitoimisto Agri-Pari Ky | Professional & scientific | 1990 |
| Tilitoimisto Esa Anttila Oy | Professional & scientific | 2008 |
| Tilitoimisto Virve Väntsi Avoin yhtiö | Professional & scientific | 2002 |
| Tiliyli Oy | Real estate | 2009 |
| Timantti Vuokraus avoin yhtiö | Real estate | 2019 |
| Timantti taksi Oy | Transport & logistics | 2019 |
| Timatek Oy | Professional & scientific | 2023 |
| Timedico Oy | Health & social care | 2023 |
| Timlin Farm Oy | Agriculture & fishing | 2020 |
| TouhuTepot Oy | Wholesale & retail | 2023 |
| Traumapsykoterapia Kirsi Huhtelin-Lesell Ky | Health & social care | 2018 |
| Trelin Oy | Financial services | 1996 |
| Tähtituvat Avoin yhtiö | Education | 2011 |
| Törmälehto Group Oy | Construction | 1993 |
| Upicar Oy | Wholesale & retail | 1994 |
| Urpo Saari Ky | Financial services | 2006 |
| Uupe Oy | Hospitality | 2008 |
| V&JJJ Invest Oy | Financial services | 2023 |
| V2 Connect Oy | Information & communication | 2024 |
| Vahtelo OY | Professional & scientific | 2007 |
| VH-Trans Oy | Transport & logistics | 2022 |
| Vieska Kama Fin Invest OY Limited, Suomen Sivuliike | Wholesale & retail | 2018 |