| A-Korjaamo J. Tirri Oy | Other services | 1989 |
| ALOR Oy | Financial services | 2001 |
| Agrikumppanit Oy | Agriculture & fishing | 2014 |
| Alashalli Oy | Other services | 2010 |
| Alastaron Liikekiinteistöt Oy | Real estate | 1991 |
| Alastaron Lounaspiste Ky | Hospitality | 1991 |
| Alastaron Puhallus- ja Maalauspalvelu Oy | Construction | 1995 |
| Alastaron Pörssi Oy | Financial services | 1987 |
| Alastaron Rakentajat Oy | Construction | 1987 |
| Alastaron Tili ja Kiinteistö Oy | Professional & scientific | 1994 |
| Altike avoin yhtiö | Professional & scientific | 2015 |
| Anjaki Oy | Wholesale & retail | 2018 |
| Avoin yhtiö Alastaron Kodinkone Mäkinen & Huotilainen | Wholesale & retail | 1990 |
| EO-SähköPiikki Oy | Construction | 2006 |
| Edena Oy | Health & social care | 2025 |
| Egstone Oy | Agriculture & fishing | 2011 |
| Farmi-Erkkilä Oy | Agriculture & fishing | 2013 |
| Grando Oy | Hospitality | 2021 |
| Hilfe Oy | Transport & logistics | 2008 |
| Hinaus-Linkki Oy | Transport & logistics | 2019 |
| Huhtalan Taksit Oy | Transport & logistics | 2020 |
| Jaakko Rautala Oy | Agriculture & fishing | 2002 |
| Johto Software Oy | Information & communication | 2016 |
| Joset Oy | Wholesale & retail | 2011 |
| Jouni Saastamoinen & Co | Hospitality | 1984 |
| Juha ja Teemu Oy | Real estate | 1986 |
| Järri Forest Oy | Agriculture & fishing | 2017 |
| Kaaharit Oy | Other services | 2002 |
| Kalustepisara Oy | Wholesale & retail | 1996 |
| Kanakumppanit Oy | Agriculture & fishing | 2005 |
| Kanoiks Oy | Manufacturing | 2024 |
| Karaati Oy | Manufacturing | 2012 |
| Kiinteistö Oy Alastaron Myllytie 4 | Real estate | 2006 |
| Kiinteistö Oy Alastaron Mäkipää | Real estate | 2007 |
| Kiinteistö Oy Kotirinne-Alastaro | Real estate | 2007 |
| Kiinteistö Oy Pirtti-Alastaro | Real estate | 1996 |
| Kone- ja Rakennustyö Lehtonen Oy | Construction | 2014 |
| Koneurakointi Ismo Mäkelä Oy | Construction | 2011 |
| Koneurakointi Järri Oy | Construction | 2012 |
| Koneurakointi Kallionpää Oy | Construction | 2012 |
| Koneurakointi Rami Kivekäs Oy | Construction | 2002 |
| Kotiapu Oy Anu Männistö | Health & social care | 2014 |
| Kukkojan Tila Oy | Agriculture & fishing | 2007 |
| Kuljetus Tero Liukas Oy | Transport & logistics | 2019 |
| Laivasisustus ja Rakennusurakointi JVJ Oy | Construction | 2001 |
| Loimaan Aluetaksi Oy | Transport & logistics | 2008 |
| Loimaan Kolarikorjaamo Oy | Other services | 2015 |
| Loimaan PT Rakennus Oy | Construction | 2016 |
| Loor Oy | Construction | 2021 |
| MMH Oy Huotilainen | Agriculture & fishing | 1991 |
| Maalaus ja Mattotyö Hänninen Oy | Construction | 1997 |
| Maalog oy | Transport & logistics | 2014 |
| Matti Koivisto Oy | Construction | 2011 |
| Melkart Oy | Other services | 1995 |
| Melotron Oy | Other services | 2000 |
| Merikallion nostolavat Oy | Administrative & support | 2000 |
| Mixeri Oy | Construction | 2006 |
| Namukori Oy | Wholesale & retail | 2022 |
| Nikmar Oy | Agriculture & fishing | 2020 |
| Oakland Labs Oy | Manufacturing | 2020 |
| Ossi Saaren Tila Oy | Agriculture & fishing | 2000 |
| Osuuskunta Freezing Penguin | Information & communication | 2011 |
| Osuuskunta Timtax | Administrative & support | 2017 |
| Pakilantien Sorvaus Oy | Real estate | 2021 |
| Panpot Oy | Arts & recreation | 2023 |
| Pekka Mäkipää Oy | Transport & logistics | 1979 |
| Pellotsalo Ky | Administrative & support | 1982 |
| Pitkärannan Kauppa Oy | Wholesale & retail | 1984 |
| Project Ship Installation Oy | Manufacturing | 2006 |
| Puukuljetus J.Välimäki Oy | Transport & logistics | 2008 |
| Raimec Installations Oy | Manufacturing | 2007 |
| Rakennusliike Hakanen Oy | Construction | 1994 |
| Rakennuspexi Oy | Construction | 2007 |
| RanSam Oy | Real estate | 2014 |
| Rim Wizard Oy | Wholesale & retail | 2017 |
| SS-Metalli Oy | Manufacturing | 2008 |
| Sallila Energia Oy | Energy | 1915 |
| Sallila Sähkönsiirto Oy | Energy | 2006 |
| Salomäen Tila Oy | Agriculture & fishing | 2013 |
| Se-automaatio oy | Construction | 2018 |
| Suutarlan Täystuho avoin yhtiö | Construction | 2012 |
| SähköTenho Oy | Construction | 2025 |
| Sähköasennus Talvitie Oy | Construction | 2005 |
| TB Huolto Lehtilä Ky | Wholesale & retail | 2007 |
| TT-Farmi Oy | Agriculture & fishing | 2000 |
| Taksi Juha Suominen Oy | Transport & logistics | 2018 |
| Taksipalvelu Jari ja Raimo Huhtala Oy | Transport & logistics | 2016 |
| Taksipalvelu Loimitaksi Oy | Transport & logistics | 2024 |
| Takun Puu Oy | Construction | 2000 |
| Taltor Oy | Manufacturing | 1991 |
| Tasoite&Rappaus Kurri Oy | Construction | 2026 |
| Terifix Oy | Other services | 1996 |
| Toivosen Tila Oy | Agriculture & fishing | 2020 |
| Traverum Oy | Administrative & support | 2024 |
| Tuu-Ma Oy | Agriculture & fishing | 2012 |
| Vainiopunti Invest Oy | Real estate | 2025 |
| Veljekset Lehtonen Oy | Agriculture & fishing | 2016 |
| Ventcomp Oy | Manufacturing | 2020 |
| Vinset Oy | Manufacturing | 1988 |
| Virttaan Kiinteistö Oy | Real estate | 1966 |