| Morvarid Oy | Hospitality | 2020 |
| Moto-Alm Oy | Agriculture & fishing | 2000 |
| Multapois Oy | Agriculture & fishing | 2009 |
| Murto-Unkila Oy | Construction | 2014 |
| NOH Vuokraus Oy | Administrative & support | 2026 |
| Necaemission Oy | Manufacturing | 2024 |
| Nummek Oy | Manufacturing | 2004 |
| Nummek Trade Oy | Manufacturing | 1977 |
| Näpsä-laiturit Oy | Manufacturing | 2007 |
| OK Farms Oy | Agriculture & fishing | 2008 |
| OSR-Invest Oy | Professional & scientific | 1990 |
| OY International Trade Consulting AB | Construction | 1989 |
| Oikia Tilitoimisto Oy | Professional & scientific | 1985 |
| OnWood Oy | Construction | 2000 |
| Oy Isovihree Ab | Administrative & support | 1991 |
| Oy Mekan-nummi Ab | Manufacturing | 1975 |
| PK Sammutinhuolto Oy | Wholesale & retail | 2021 |
| PRK-Laaksonen Oy | Construction | 2017 |
| Pajakullan Tila Oy | Agriculture & fishing | 2022 |
| Pasi Eriksson Oy | Agriculture & fishing | 2021 |
| Perniön A & L Rakenne Ky | Manufacturing | 1987 |
| Perniön Airtools Oy | Manufacturing | 2008 |
| Perniön Hius Oy | Other services | 2020 |
| Perniön KKV-Vuokraus Oy | Administrative & support | 2010 |
| Perniön Kauppahuone Oy | Information & communication | 1964 |
| Perniön Kebab avoin yhtiö | Hospitality | 1998 |
| Perniön Metsäkuljetus Oy | Agriculture & fishing | 1995 |
| Perniön Metsäpojat Oy | Agriculture & fishing | 2004 |
| Perniön OP-Tilikeskus Oy | Professional & scientific | 1969 |
| Perniön Pappila Oy | Real estate | 2023 |
| Perniön Rahtipalvi Oy | Manufacturing | 2018 |
| Perniön Rakennustyö Oy | Construction | 2008 |
| Perniön Rullakebab -tehdas Oy | Manufacturing | 2008 |
| Perniön Saunapalvi Oy | Manufacturing | 2018 |
| Perniön Talotekniikka & Pienrauta Oy. | Wholesale & retail | 2026 |
| Perniön Väri ja Tapetti kommandiittiyhtiö | Wholesale & retail | 1978 |
| Perniönpuiston Huolto Oy | Administrative & support | 1984 |
| Pneutec Ky | Professional & scientific | 1983 |
| RK Moottorihuolto Oy | Other services | 2020 |
| RR Ruohoranta Oy | Financial services | 1990 |
| RR-Koneistus Oy | Manufacturing | 2025 |
| RR-Sorvaus Oy | Manufacturing | 2023 |
| RR-Vet Oy | Professional & scientific | 2023 |
| RT-Maalaus Oy | Construction | 1985 |
| Rakennus Saarinen Oy | Construction | 2021 |
| Rakennusliike Fagerström Oy | Construction | 2005 |
| Rakennuspelti Etsalo & Etsalo ky | Construction | 1985 |
| Raksalle Oy | Construction | 2016 |
| Risto Rintakoski Oy | Financial services | 2018 |
| Rondamode Oy | Financial services | 2021 |
| Ruokalilli Oy | Wholesale & retail | 2024 |
| SJ-Precision Oy | Manufacturing | 2026 |
| Saara Sulanen Oy | Other services | 2022 |
| Sahlbom Oy | Information & communication | 2025 |
| Salon Pihamies Oy | Administrative & support | 2014 |
| Sarppi Oy | Construction | 2018 |
| Sijoitusyhtiö Pihlaja Oy | Financial services | 2013 |
| Sikalaosakeyhtiö Ahlqvist | Agriculture & fishing | 1996 |
| Simon Camping & Fishing Oy | Hospitality | 2026 |
| Sipo-Niitty Oy | Agriculture & fishing | 1995 |
| Storybound Oy | Professional & scientific | 2025 |
| Suomen Jahti Varuste Ky | Wholesale & retail | 2007 |
| Sähkö Nurmi Oy | Construction | 2009 |
| TSGA Oy | Arts & recreation | 2008 |
| TT-Välitys Oy | Real estate | 2008 |
| TaRiYa Oy | Professional & scientific | 2018 |
| TahtiTukku Oy | Wholesale & retail | 2025 |
| Taiga Invest Oy | Construction | 2023 |
| Takametsän Voima Oy | Energy | 2008 |
| Taksi- ja Tilausliikenne Särkinen Oy | Transport & logistics | 2018 |
| Tasemarkat Oy | Professional & scientific | 1988 |
| Tasoite ja Maalaus H Lunki Oy | Construction | 2018 |
| TeijoCon Oy | Administrative & support | 2015 |
| Teoin Oy | Professional & scientific | 2012 |
| Ti-Li Investment Oy | Financial services | 2021 |
| Tieisännöinti Vaahtera Oy | Real estate | 2024 |
| Tiipilän Lämpö Oy | Energy | 1975 |
| Tilitoimisto Heino Ky | Professional & scientific | 2007 |
| Topaz Oy | Manufacturing | 2018 |
| Trans-Manninen Oy | Transport & logistics | 1994 |
| Tuovila Capital Oy | Agriculture & fishing | 2021 |
| Tuulan Tuvat Oy | Real estate | 2009 |
| Unelma Diili Oy | Transport & logistics | 2014 |
| Upin Näyttelyt Oy | Arts & recreation | 2023 |
| Valla Outdoors Oy | Administrative & support | 2019 |
| Value4C Oy | Professional & scientific | 2025 |
| Vanlai Oy | Real estate | 2022 |
| Varaosakartta Oy | Information & communication | 2025 |
| Varenda Group Oy - vanX - tukkuX - rentaX - truX - umaX - fiX - tireX - homeX | Professional & scientific | 2025 |
| Veraze Oy | Other services | 2021 |
| Viherpalvelu Pihavihreä Oy | Administrative & support | 2018 |
| Villa Adlije Oy | Real estate | 2025 |
| Walhalla Team Oy | Transport & logistics | 2026 |
| Wipro Infrastructure Engineering Oy | Manufacturing | 1989 |
| Woodwinds ky | Wholesale & retail | 1978 |