| RakTek Engineering Oy | Construction | 2018 |
| Rakennepalvelu Jurva Rinne Oy | Manufacturing | 1987 |
| Rakennus Is-Ka Ky | Professional & scientific | 1991 |
| Rakennus Leivo Oy | Construction | 1987 |
| Rakennus-Lalla Oy | Construction | 1991 |
| Rakennuskonsultointi ja -suunnittelu J. Lalla Oy | Professional & scientific | 2024 |
| Rakennuspalvelu JJ Levo Oy | Construction | 2006 |
| Rakennussuunnittelu Soinu Oy | Construction | 2021 |
| Rakennustoimisto Soinu Oy | Construction | 2017 |
| Rakennusurakointi Vanha-Rauvola Ky | Construction | 1987 |
| Ramoss Ravintola Oy | Hospitality | 2023 |
| Randenin Verhoomo Ky | Other services | 1990 |
| Rannan Marjat Oy | Agriculture & fishing | 2022 |
| Rastegaise Oy | Wholesale & retail | 1988 |
| Rauman Kolariosa Nieminen & Nieminen | Wholesale & retail | 1987 |
| Ravinnelogistiikka Oy | Transport & logistics | 1995 |
| Ravintola Kukonkulma Avoin Yhtiö | Hospitality | 1991 |
| Ravintola Kusfa Oy | Hospitality | 2023 |
| Realistic Prosthetic Finland Oy | Health & social care | 2022 |
| Renest Group Oy | Construction | 2024 |
| Rengas-Laitila Oy | Wholesale & retail | 2020 |
| Resaltek Oy | Manufacturing | 2019 |
| Reship Oy | Transport & logistics | 2019 |
| Rilahe Oy | Construction | 2016 |
| Ripleri Oy | Construction | 2009 |
| Riverside Invest Oy | Administrative & support | 2021 |
| Rohdostupa Oy | Wholesale & retail | 2024 |
| Romu-Katti Oy | Transport & logistics | 2006 |
| SE-Tili Oy | Professional & scientific | 1999 |
| SES Holding Oy | Financial services | 2024 |
| SP Moulding Finland Oy | Manufacturing | 2004 |
| SP Ravintola Kukonkulma Oy | Hospitality | 2008 |
| SV-Rakenne Levo Ky | Construction | 1990 |
| Saariston Tila Oy | Agriculture & fishing | 2023 |
| Sairaankuljetus Tapani Oy | Health & social care | 1982 |
| SalVakka Oy | Energy | 2025 |
| Samppa Paint Oy | Construction | 2023 |
| Samppakiinteistöt Oy | Real estate | 2005 |
| Samppamaalaus Oy | Construction | 2012 |
| Samppanummen Yritystalo Oy | Real estate | 2019 |
| Samuli Simula Oy | Manufacturing | 1996 |
| Satavakka Oy | Energy | 1992 |
| Savikon Pienrakennuspaja Oy | Construction | 2026 |
| Sediment Oy Laitila | Water & waste | 2020 |
| Serigraaf Oy | Manufacturing | 2012 |
| Sikago Oy | Wholesale & retail | 2000 |
| Simulan Tila Oy | Agriculture & fishing | 2015 |
| Siniste Oy | Real estate | 2014 |
| Sinun mielesi OY | Health & social care | 2024 |
| Sisustus- ja Rakennussuunnittelu Sira Oy | Wholesale & retail | 1998 |
| Soinu Holding Oy | Real estate | 2018 |
| Soinu Ky | Construction | 2007 |
| Solar Power Holding Oy | Financial services | 2017 |
| Sora ja Kallio Heinonen Oy | Mining & quarrying | 1988 |
| Soundform Music Avoin Yhtiö | Arts & recreation | 2009 |
| Steelfox Ky | Manufacturing | 2014 |
| Stenholm avoin yhtiö | Agriculture & fishing | 1987 |
| Stock Traders Team Finland Oy | Financial services | 2003 |
| Sulotek Oy | Manufacturing | 1989 |
| Suomen LaatuKone Oy | Wholesale & retail | 2014 |
| Suomen Nahka ja Olkain Oy | Manufacturing | 2019 |
| Suontaan Vesihuolto-osuuskunta | Water & waste | 2007 |
| Suosiva Oy | Wholesale & retail | 2017 |
| Sydämellä Design Oy | Wholesale & retail | 2020 |
| Sähkö-Perkkola Oy | Wholesale & retail | 1992 |
| Sähkö-Silvola Kommandiittiyhtiö | Construction | 1977 |
| Sähköurakointi Heinonen Oy | Construction | 2008 |
| TK Kouru Oy | Construction | 2020 |
| TUO-JO Oy | Wholesale & retail | 2013 |
| Taimavuo Oy | Administrative & support | 2026 |
| Taksi Päivi Nurmi Ky | Transport & logistics | 2006 |
| Tamino Oy | Financial services | 2021 |
| Tanssiorkesteri Kaiho Oy | Arts & recreation | 2018 |
| Tarmamet Oy | Manufacturing | 2006 |
| Tasovihannes Ky | Wholesale & retail | 1980 |
| Telenikkari Oy | Real estate | 1995 |
| Teletoimi Oy | Construction | 2007 |
| TemmelTanner Oy | Arts & recreation | 2021 |
| The Bunny Productions osk | Arts & recreation | 2022 |
| Tiihosen Leipomo Oy | Manufacturing | 2019 |
| Tilateurastamo Maiskis Oy | Manufacturing | 1994 |
| Tilitoimisto Heikki Peltola Oy | Professional & scientific | 1988 |
| Tilix Oy | Professional & scientific | 2021 |
| Tipux Oy | Agriculture & fishing | 2015 |
| Tohaus Oy | Real estate | 2015 |
| Tommi Laine Trading Oy | Wholesale & retail | 1993 |
| Tommi Vippola Oy | Agriculture & fishing | 2009 |
| Tonest Oy | Agriculture & fishing | 2008 |
| Torikan Tila Oy | Agriculture & fishing | 2015 |
| Triforce Oy | Energy | 2018 |
| Tructor Oy | Wholesale & retail | 2018 |
| Tube Holding Oy | Professional & scientific | 2025 |
| Tuokilan Tila Oy | Agriculture & fishing | 2013 |
| Tuomi Group Oy | Professional & scientific | 2021 |
| Tuorekartano Oy | Wholesale & retail | 2008 |
| Turkoosi 11 Oy | Professional & scientific | 1998 |
| Turun Vuokravarastot Oy | Real estate | 2021 |
| Tusutek Oy | Construction | 2020 |
| Tuulihaukka Oy | Agriculture & fishing | 1989 |
| Tuunan Koneurakointi Oy | Agriculture & fishing | 2019 |