| A-P Productions Oy | Professional & scientific | 1994 |
| A.S Auto Ja Rakennuspalvelut OY | Real estate | 2023 |
| AVR Rak Oy | Construction | 2017 |
| Aarni Health Oy | Professional & scientific | 2019 |
| Aarni Henkilöstö Oy | Administrative & support | 2019 |
| Aarni Kasvu Oy | Professional & scientific | 2020 |
| Alderland Oy | Wholesale & retail | 2021 |
| Ami Junnila Oy | Wholesale & retail | 2016 |
| Beautyspot Kitta Oy | Other services | 2019 |
| Bell Communications Oy | Professional & scientific | 2004 |
| Benera Oy | Professional & scientific | 2008 |
| Big Five Solutions Oy | Professional & scientific | 2022 |
| Biojack Oy | Manufacturing | 2010 |
| Biotsek Oy | Professional & scientific | 2019 |
| Bonlex Oy | Professional & scientific | 2025 |
| Drunken seal beverage aid Oy | Hospitality | 2025 |
| Edureal Oy | Real estate | 2019 |
| Eklund Enterprises Oy | Professional & scientific | 2024 |
| Ekotrans Oy | Transport & logistics | 2022 |
| Eteläkärjen Laiva Oy | Transport & logistics | 1992 |
| Euro Group Oy | Manufacturing | 2015 |
| Eurocomp Oy | Construction | 1998 |
| Flinkki Ky | Wholesale & retail | 1991 |
| Fysika Perniön fysioterapia- ja kuntokeskus Oy | Health & social care | 2018 |
| Gardi Oy | Manufacturing | 2024 |
| Gynekologipalvelut Pirjo Järvinen Oy | Health & social care | 2024 |
| H. Koskinen Oy | Water & waste | 1999 |
| HJ-RENKAAT avoin yhtiö | Wholesale & retail | 2016 |
| HK-Automaalaus Oy | Other services | 2015 |
| Halikon RKT Ky | Construction | 2005 |
| Hannu A. Veikkolin Oy | Construction | 2021 |
| Hautauspalvelu Aava Oy | Other services | 2022 |
| Hoivakoti Mathilda Oy | Health & social care | 1998 |
| Hummetal Oy | Manufacturing | 2015 |
| Huoltokorjaamo J. Parviainen Oy | Other services | 2017 |
| Huoposen Saha Oy | Manufacturing | 1994 |
| HÅK Graniitti Oy | Construction | 1989 |
| Hästön Maatila Oy | Agriculture & fishing | 2003 |
| Idea Machine Oy | Manufacturing | 1989 |
| Infra Olli Oy | Construction | 2024 |
| International K9 Institute Ltd Oy | Other services | 2021 |
| JJ Wildexperience Hunting oy | Agriculture & fishing | 2020 |
| JLS-Yhtiö Oy | Construction | 2018 |
| JMA-Kiinteistöt Oy | Real estate | 2018 |
| JS-Kulta Oy | Wholesale & retail | 1996 |
| JTL-Rent Oy | Real estate | 1997 |
| Jellow Factory Oy | Manufacturing | 2019 |
| Jesimer Ky | Manufacturing | 2011 |
| JobCo Oy | Manufacturing | 2003 |
| Johanneslund Oy | Professional & scientific | 1993 |
| Johannisberg Adventures Oy | Arts & recreation | 2024 |
| Johannisberg Investment Oy | Real estate | 2025 |
| JuJo Oy | Professional & scientific | 2014 |
| Jurttipois Oy | Agriculture & fishing | 2010 |
| KT-Invest Oy | Financial services | 1987 |
| KaEr Oy | Administrative & support | 2010 |
| Kaisa Isotupa Oy | Hospitality | 2025 |
| Kiinteistö OY Wijenita Fastighets AB | Real estate | 1987 |
| Kiinteistö Oy Kuusjoen Seiskakuus | Real estate | 2010 |
| Kiinteistö Oy Perniön Petäjämäki | Real estate | 1991 |
| Kiinteistö Oy Perniön Ykköset | Real estate | 2008 |
| Kiinteistö Oy Tiipilä | Real estate | 1975 |
| Kiinteistö-Lindroos Oy | Real estate | 2009 |
| KoneHai Oy | Other services | 2024 |
| Kosken vesiosuuskunta | Water & waste | 1986 |
| Kovamäen tila Oy | Agriculture & fishing | 2014 |
| Kuljetus Nurmela Oy | Transport & logistics | 2006 |
| Kuljetus Petri Villa Oy | Transport & logistics | 2013 |
| Kuljetus Simo Niemi Oy | Transport & logistics | 2007 |
| Kuljetus Sirkiä Oy | Transport & logistics | 2004 |
| Kuljetusliike Hovi Ky | Transport & logistics | 1972 |
| LLP Markkinointi Oy | Information & communication | 2026 |
| Laatukasvatus Oy | Agriculture & fishing | 2023 |
| Laitinen Holding Oy | Professional & scientific | 2025 |
| Laki ja Evankeliumi Oy | Health & social care | 2023 |
| Lattialle Oy | Information & communication | 2022 |
| Laukkaset investment Oy | Real estate | 2018 |
| Lehtisen Puutarha Oy | Agriculture & fishing | 2014 |
| Lesel Oy | Manufacturing | 2006 |
| Lounais-Suomen Alihankinta Oy | Manufacturing | 2017 |
| Lounais-Suomen Laatuhake Oy | Agriculture & fishing | 2023 |
| Lupajan Murske Oy | Construction | 2002 |
| Lupajan jätevesiosuuskunta | Water & waste | 2011 |
| M & M Peltola Oy | Wholesale & retail | 2010 |
| MRJK-Kaivuu Oy | Construction | 2019 |
| Maa-ainescom Oy | Mining & quarrying | 2010 |
| Maalausliike Jarmo Laaksonen Ky | Construction | 1986 |
| Maatila Örri Oy | Agriculture & fishing | 2014 |
| Maisema Invest Oy | Real estate | 2022 |
| Malin Roads Oy | Administrative & support | 2023 |
| Mariannen Kotipalvelu Oy | Health & social care | 2020 |
| Marita ja Mila Oy | Arts & recreation | 2024 |
| Marketpojat Oy | Wholesale & retail | 2017 |
| Masima avoin yhtiö | Administrative & support | 2022 |
| Matrona Oy | Construction | 2016 |
| MaxiMar avoin yhtiö | Administrative & support | 2017 |
| MetsäVarvikko Oy | Agriculture & fishing | 2008 |
| MikoMako Oy | Professional & scientific | 2022 |
| Mil-Hunt Suppressors Oy | Manufacturing | 2024 |
| Mortinmäen Mukava Koirahotelli Avoin yhtiö | Other services | 2011 |