| Sjötrade Oy | Professional & scientific | 1993 |
| Skibbie Oy | Wholesale & retail | 2024 |
| Sonkkila Investment Oy | Agriculture & fishing | 2007 |
| Spoonful Oy | Hospitality | 2015 |
| Sporttitehdas Oy | Arts & recreation | 2021 |
| Spurilan Marjat Oy | Real estate | 2021 |
| Starttivalmennus Oy | Education | 2017 |
| Studio Ilmari Oy | Information & communication | 2013 |
| Stuntpioneers Oy | Manufacturing | 2026 |
| Subtropic Finland Oy | Wholesale & retail | 1989 |
| Sukselan Jätevesiosuuskunta | Water & waste | 2008 |
| Suomen Kalustopankki Oy | Administrative & support | 2020 |
| Suomen Kone- ja Laitepalvelu Oy | Manufacturing | 2015 |
| Suomen Osuusmuuraus | Construction | 2006 |
| Suomen Pihatyö Oy | Administrative & support | 2021 |
| Syseko Oy | Information & communication | 1985 |
| Sähkö Ampeeri Oy | Construction | 2021 |
| Sähkö-Automaatio Joripa Oy | Construction | 2009 |
| Sähköpalvelu K.Laine Oy | Construction | 2009 |
| Säteri Invest Oy | Real estate | 1984 |
| Tehan OY | Construction | 2013 |
| TJS Innovaatiot Oy | Wholesale & retail | 2025 |
| TL Inno Oy | Financial services | 2018 |
| Tukimatik OY | Households | 2013 |
| Taitotekijät Group Oy | Construction | 2017 |
| Taksi Roos Oy | Transport & logistics | 2022 |
| Talent Dogs Valmennuspalvelut Oy | Other services | 2021 |
| Tammari Oy | Construction | 2012 |
| Tanssikoulu Antti Törmänen Oy | Education | 2014 |
| Team Rantsu Oy | Financial services | 2024 |
| Terapiapalvelut Tulevaisuuden Historia Oy | Health & social care | 2026 |
| The Serandons Oy | Information & communication | 2022 |
| Tiiltec Oy | Manufacturing | 2016 |
| Tili-Paimio Oy | Professional & scientific | 1993 |
| Tili-Peimari OY | Professional & scientific | 2014 |
| Tilitimantti Oy | Professional & scientific | 2003 |
| Tilitoimisto Nummila Ky | Professional & scientific | 2003 |
| Tradecom OY | Other services | 2006 |
| Train & Feel Oy | Education | 2011 |
| Tuikitaan Oy | Professional & scientific | 2019 |
| Tupus Sijoitus Oy | Financial services | 2021 |
| Turnip Rock Oy | Information & communication | 2016 |
| Turun Ajovaruste Oy | Wholesale & retail | 2014 |
| Turun Betonirakenne Oy | Construction | 2022 |
| Turun HKV-Rakennepalvelu Oy | Manufacturing | 2000 |
| Turun Talonmiespalvelu Oy | Construction | 2026 |
| Turun Teollisuuden Purkajat Oy | Construction | 2006 |
| Turun Yritystaksit Oy | Transport & logistics | 2011 |
| Uhmis Oy | Financial services | 1989 |
| Urban Design Boutique Oy | Wholesale & retail | 2015 |
| VLiNdATA Oy | Information & communication | 2023 |
| VOS Advisory & Consulting Oy | Professional & scientific | 2026 |
| VS-Hallitila Oy | Real estate | 2014 |
| Vahasilta Oy | Manufacturing | 2015 |
| Vakre Oy | Other services | 2022 |
| Vansor Oy | Manufacturing | 1993 |
| Varastoasema Oy | Transport & logistics | 2007 |
| Varsinais-Suomen Talot Oy | Construction | 2023 |
| Vedessa Oy | Professional & scientific | 2026 |
| VelMed Oy | Financial services | 2009 |
| Veljekset Kovanen Oy | Construction | 1990 |
| Ventilation Music & Entertainment Oy | Arts & recreation | 2019 |
| Vilomix Finland Oy | Manufacturing | 1982 |
| Visba Oy | Hospitality | 1993 |
| Vistalasi Avoin yhtiö | Construction | 1998 |
| Vistamatkat Oy | Administrative & support | 1989 |
| Vistan Kauppa Oy | Wholesale & retail | 1977 |
| Vistan Kerrostalo Oy | Real estate | 1955 |
| Vistan Markkinat Oy | Real estate | 1988 |
| Vistan Paistekiinteistöt Oy | Real estate | 2024 |
| Vistan Pesula Oy | Other services | 2024 |
| Vistan Vauhtivarpaat Oy | Education | 2008 |
| Vistavisio Oy | Wholesale & retail | 1981 |
| Vivi Point OY | Professional & scientific | 2015 |
| Voimakas Sali Oy | Arts & recreation | 2021 |
| Vähäkiinteistöt Oy | Real estate | 2002 |
| WALSACO Oy | Wholesale & retail | 2008 |
| WWL Tekniikka Oy | Manufacturing | 2020 |
| WellingLures Oy Ltd. | Wholesale & retail | 2014 |
| Whitewater Coast Oy | Wholesale & retail | 2021 |
| Xioxmara Oy | Wholesale & retail | 2019 |
| Yhden Tähden Oy | Hospitality | 2021 |
| avopalvelut Apila oy | Health & social care | 2005 |
| idaida Oy | Hospitality | 2020 |
| jh remontointi oy | Construction | 2024 |
| Äidit Media OY | Arts & recreation | 2019 |