| SHP-Palvelut Oy | Administrative & support | 2021 |
| SHP-Sijoitus Oy | Administrative & support | 2021 |
| SKM-Tekniikka Oy | Construction | 2006 |
| SP Elementit Oy | Manufacturing | 2011 |
| SaJa kiinteistöt Oy | Real estate | 2022 |
| Saaga viesti Oy | Professional & scientific | 2025 |
| Sainion Peltisepänliike Ky | Construction | 1975 |
| Saluuna Majava Oy | Hospitality | 2016 |
| Samjet Oy | Professional & scientific | 2009 |
| Saraforma Oy | Professional & scientific | 2000 |
| Sarbuss V & K Sarmeen | Transport & logistics | 1995 |
| Satahammas Oy | Manufacturing | 1983 |
| Sataharju Oy | Construction | 2024 |
| Satahelmi Oy | Health & social care | 2023 |
| Satakampi Oy | Other services | 2025 |
| Satakunnan Siivouspalvelu Ky | Administrative & support | 1982 |
| Satakunnan Sisäilmapalvelu Oy | Administrative & support | 2010 |
| Satamek Oy | Manufacturing | 2016 |
| Satanäkö Oy | Wholesale & retail | 2015 |
| Satasammutin Oy | Manufacturing | 1989 |
| Satatila oy | Transport & logistics | 2022 |
| Scoogie Oy | Arts & recreation | 2009 |
| Scuderia Finland Oy | Wholesale & retail | 2022 |
| Sellent Oy | Manufacturing | 1998 |
| Signature Kodit Oy | Real estate | 2022 |
| Sijoitus 100 Oy | Real estate | 2019 |
| Skönön Safarit Oy | Arts & recreation | 1999 |
| Snowbistro avoin yhtiö | Hospitality | 2013 |
| Soft Diamond Oy | Manufacturing | 2004 |
| Sosiaalipalvelut SaJa Oy | Health & social care | 2022 |
| Soturi Oy | Information & communication | 2022 |
| Sound Elite avoin yhtiö | Arts & recreation | 2017 |
| Sporthold Oy | Professional & scientific | 2023 |
| Starament Oy | Construction | 2023 |
| Stormax Oy | Construction | 2008 |
| Successful Moon Oy | Professional & scientific | 2025 |
| Suomen Alitus Oy | Construction | 2018 |
| Suomen Autopinnoite Oy | Other services | 2016 |
| Suomen Bussikauppa Oy | Wholesale & retail | 2014 |
| Suomen Pakkauslaatikkotehdas Oy | Manufacturing | 2021 |
| Suomen Putkiasentajat Oy | Construction | 2014 |
| Suomen Raskas Kalusto Oy | Wholesale & retail | 2024 |
| Suomen Ravintolalaite Oy | Wholesale & retail | 2019 |
| Suonpään Metallirakenne Ky | Manufacturing | 1989 |
| Super-KaMa Oy | Arts & recreation | 2020 |
| Suunnittelupalvelu Sampo Kuusinen kommandiittiyhtiö | Wholesale & retail | 1999 |
| Sylvestori Ky | Real estate | 1992 |
| Sähkö ja Rakennuskolmio Oy | Construction | 2018 |
| Sähkö-Domino Oy | Construction | 2018 |
| Sähköasennus Anttila Ky | Construction | 1981 |
| Sähkötekniikka Joensuu Oy | Construction | 2025 |
| Sävisys Oy | Professional & scientific | 1994 |
| Tamarai Ky | Other services | 2016 |
| TC Kiinteistöt Oy | Real estate | 2021 |
| Tiemm Pizza OY | Hospitality | 2026 |
| TJ Maanrakennus Oy | Construction | 2022 |
| TL Metsäpalvelut Ky | Agriculture & fishing | 2009 |
| Taksi Halmela Oy | Transport & logistics | 2025 |
| Taksi Länsi-Suomi Osuuskunta | Transport & logistics | 2017 |
| Taksipalvelu Rosenberg Oy | Transport & logistics | 2019 |
| Talkkarimatti Oy | Administrative & support | 2015 |
| Taloneuvo Rosenberg Oy | Professional & scientific | 2015 |
| Tapion Konditoria Ky | Manufacturing | 1979 |
| Tarvikepiste Oy Hakala | Wholesale & retail | 1984 |
| Tavat Oy | Real estate | 1987 |
| Tecsec Oy | Construction | 2003 |
| TekHaka Oy | Construction | 2013 |
| Tekracon Oy | Construction | 2006 |
| Telcotec Oy | Wholesale & retail | 2005 |
| Terveyspiste Mäntysalo Oy | Wholesale & retail | 2023 |
| Tiino Oy | Transport & logistics | 2023 |
| Tili- ja Konsulttitoimisto Mestari Oy | Professional & scientific | 2002 |
| Tilintarkastus Torpo Oy | Professional & scientific | 2001 |
| Tilipalvelu Kiviharju Ky | Professional & scientific | 2006 |
| Tilitoimisto Elma Oy | Professional & scientific | 2023 |
| Tilitoimisto Minna Väliaho Oy | Professional & scientific | 2008 |
| Tilitoimisto Torpo Oy | Professional & scientific | 1974 |
| Tilitoimisto Torsti Myllymäki Oy | Professional & scientific | 1995 |
| Timberlog Oy | Agriculture & fishing | 2019 |
| Toredo Oy | Real estate | 2020 |
| Tumeku Oy | Construction | 1994 |
| Tuomi-Kenkä Oy | Manufacturing | 1977 |
| Urakointi K Varis Oy | Construction | 2007 |
| Uudisrakennus/Saneeraus Huhtamäki Oy | Construction | 2008 |
| Uuho Oy | Construction | 2022 |
| VEKI Invest Oy | Real estate | 2023 |
| VT Kiinteistöpalvelut Oy | Real estate | 2020 |
| Vakuutuspaja R.Kuusisto Oy | Financial services | 2020 |
| ValueTek Oy | Real estate | 2017 |
| Valvea Oy | Professional & scientific | 2023 |
| Vatajaiset Oy | Construction | 1997 |
| Vatajankoski Oy | Energy | 1980 |
| Vatajankoski Sähköverkko Oy | Energy | 2020 |
| Vauhdin Festivaali Oy | Professional & scientific | 2016 |
| Veikka Financial Engineering Oy | Financial services | 2016 |
| Vernikos Lines Oy | Wholesale & retail | 1993 |
| Vesan Sähkö Oy | Construction | 2011 |
| Vesijohtoliike Esko Paavilainen, kommandiittiyhtiö | Construction | 1977 |
| Vetoturve Oy | Mining & quarrying | 1989 |
| Vihusaaren Vesiosuuskunta | Water & waste | 2024 |