| Pari alpakkaa ja ryysyjä Oy | Arts & recreation | 2021 |
| Peltomaa Relining Solutions Oy | Water & waste | 2025 |
| Pesuset Oy | Wholesale & retail | 1977 |
| Pesutimangi Oy | Other services | 1989 |
| Pikkala Taverna Ky Ekström & Saari | Hospitality | 1983 |
| Pitopalvelu ja moniapu TuuMa Oy | Hospitality | 2012 |
| Plusdent Oy | Health & social care | 1988 |
| Pohjan ratkaisut Oy | Administrative & support | 2020 |
| Precision Executive Development Oy | Professional & scientific | 2024 |
| Prego Oy DOCG | Professional & scientific | 1991 |
| Pro B Oy | Professional & scientific | 2010 |
| ProTech Industrial Services Oy | Manufacturing | 2024 |
| Provija Oy | Professional & scientific | 2025 |
| Prowodi Oy | Construction | 2015 |
| R. Wilkman Oy | Manufacturing | 1989 |
| Rakart OY | Construction | 2004 |
| Riistasiemen OY | Wholesale & retail | 2015 |
| RP Mettälä Kaivutyö Oy | Construction | 1987 |
| Ra-Su Piironen Oy | Construction | 2022 |
| Rakennus Ky Ekström Bygg Kb | Construction | 1989 |
| Rakennus Nordman Oy | Construction | 1990 |
| Rakennuspalvelu Kaisla Oy | Construction | 2009 |
| Rakennuspalvelu Kajander Oy | Construction | 2024 |
| Rakennuspalvelu Vilcore Oy | Construction | 2025 |
| Rakennuspiisku Oy | Construction | 1989 |
| Realex Capital Oy | Real estate | 2000 |
| Relokha Oy | Real estate | 2018 |
| Restaurants By Spoon Oy | Hospitality | 2022 |
| Riku Söderlund Oy | Construction | 2012 |
| Rock Golf Oy | Arts & recreation | 2022 |
| Rock Properties Oy | Real estate | 2022 |
| SR Finance OY | Professional & scientific | 2022 |
| Saivatron Oy | Construction | 1992 |
| Salon Lea Ky Mari Wasenius | Other services | 2017 |
| Sampleri Oy | Wholesale & retail | 2025 |
| Saneerauspalvelu Engman Oy | Construction | 1989 |
| Sanelmia Oy | Professional & scientific | 2023 |
| Scalephant Oy | Information & communication | 2026 |
| Sekoitus & Separointi Oy | Wholesale & retail | 2025 |
| Seppälä Consulting Oy Ab | Professional & scientific | 2011 |
| Serene Label Oy | Wholesale & retail | 2025 |
| Sergun Oy | Construction | 2021 |
| Seventh River Capital Oy | Financial services | 2021 |
| Siivoustimangi Ky | Administrative & support | 1988 |
| Simon & Reinhold, Partner | Real estate | |
| Sipro Sport Consult Oy | Arts & recreation | 1990 |
| Sipronen Oy | Wholesale & retail | 1989 |
| Siuntion Autotarvike Oy | Wholesale & retail | 1991 |
| Siuntion Ekosähkö Oy | Construction | 2020 |
| Siuntion Lavers Oy | Administrative & support | 1990 |
| Siuntion Mehiläistarhat Oy - Sjundeå Bigårdar Ab | Agriculture & fishing | 1979 |
| Siuntion taitonikkarit Ky | Construction | 1989 |
| Siuvatti Oy | Construction | 1990 |
| Sjundby Forskraft och Park Ab | Energy | 1997 |
| Sjundeå Maskinstation Ab | Construction | 1985 |
| Sjundeå Veterinärer Ab | Professional & scientific | 2010 |
| Sken Oy | Administrative & support | 2017 |
| Solida HR Oy | Professional & scientific | 2026 |
| Stemmi Avoin yhtiö | Administrative & support | 2008 |
| Stole Oy | Wholesale & retail | 1994 |
| Susipuu Oy | Manufacturing | 2016 |
| Suutariliike Radical Leather Oy | Other services | 2025 |
| Svanfeldt Ventures Oy | Wholesale & retail | 2026 |
| Svanfield Oy | Wholesale & retail | 2018 |
| Svenner Oy Ab | Professional & scientific | 2020 |
| Sähkö-Vikke Oy | Construction | 1995 |
| TCI Palvelut Oy | Real estate | 2019 |
| TP-Infra Oy | Real estate | 2018 |
| TT Voltti oy | Construction | 2016 |
| TTM Rakennusliike Oy | Professional & scientific | 2009 |
| Taitosähkö Oy | Construction | 2025 |
| Technovita Oy | Professional & scientific | 2025 |
| Telesys Oy | Construction | 2010 |
| TiArCo Oy | Professional & scientific | 2026 |
| TiN Advisory Oy | Administrative & support | 2019 |
| Tilikide Oy | Professional & scientific | 1998 |
| Tilitoimisto Clerkit Oy | Professional & scientific | 1994 |
| Tolonen Partners Oy | Professional & scientific | 2025 |
| Tomle Oy | Information & communication | 2019 |
| Tommi Marketing Image Oy | Professional & scientific | 2012 |
| Torgideck Oy | Real estate | 1989 |
| Torgilack Oy | Wholesale & retail | 2008 |
| Torginol-Teollisuuslattiat Oy | Manufacturing | 1973 |
| Torp Djupbäck Ab | Professional & scientific | 2020 |
| Tukipojat Oy | Professional & scientific | 2011 |
| Tuulenhenki Oy | Professional & scientific | 1995 |
| TÖRMIS GROUP Oy | Hospitality | 2025 |
| Töölö kuntosali Oy | Arts & recreation | 2022 |
| Uudenmaan Tallipalvelut Avoin yhtiö | Construction | 2010 |
| VRN Technologies Oy | Professional & scientific | 2010 |
| VS Transport Oy | Transport & logistics | 2024 |
| Valkia Advisors Oy | Professional & scientific | 2014 |
| Vaulted Oy | Information & communication | 2013 |
| Veikko Still Oy | Wholesale & retail | 1967 |
| Vesa Laukkanen Oy | Financial services | 2014 |
| Ville Salmia Oy | Agriculture & fishing | 2025 |
| Vino Games Oy | Information & communication | 2024 |
| Wattisol Oy | Construction | 2023 |
| Web-House Oy | Real estate | 1992 |
| Westdeal Oy | Construction | 2008 |