| Kiinteistö Oy Harjavallan Teollisuuskatu 32 | Real estate | 1996 |
| Kiinteistö Oy Harjavallan Vuokratalo | Real estate | 1969 |
| Kiinteistö Oy Kreetala | Real estate | 1978 |
| Kiinteistö Oy Luotolan Talli | Real estate | 1990 |
| Kiinteistö Oy Metsotie 6 | Real estate | 1992 |
| Kiinteistö Oy Pennipaja | Real estate | 1988 |
| Kiinteistö Oy Ratala 3 | Real estate | 1986 |
| Kiinteistö Oy Räisälä | Real estate | 1989 |
| Kiinteistö Oy Sairaalantie 35 | Real estate | 2005 |
| Kiinteistö Oy Seka-10 | Real estate | 1997 |
| Kiinteistö Oy Seponkatu 12 Harjavalta | Real estate | 1993 |
| Kiinteistö Oy Syky | Real estate | 1983 |
| Kiinteistö Oy Teollisuuslinna | Real estate | 1984 |
| Kiinteistö Oy Vauhtipaja | Real estate | 1990 |
| Kiinteistö Oy Velkava | Real estate | 2003 |
| Kiinteistö oy Hällinkatu 14 | Real estate | 2018 |
| Kiukaisten Minimarket Ky | Wholesale & retail | 1990 |
| Kodin Uudistus Oy | Construction | 2026 |
| Kodintekniikka Kukola Oy | Wholesale & retail | 1993 |
| Kodintekniikka Mattila Oy | Wholesale & retail | 2000 |
| Kokemäen Monitoimihalli Oy | Arts & recreation | 2015 |
| Konetalo MJS Oy | Other services | 2026 |
| Korsuluoto Invest Oy | Financial services | 2024 |
| Kuljetus J. Vohlakari ky | Wholesale & retail | 2002 |
| Kuljetus Koota Oy | Transport & logistics | 2021 |
| Kuljetus Mikola Ky | Transport & logistics | 1990 |
| Kuljetusliike Rimpinen Oy | Transport & logistics | 2005 |
| Kunto-Liikis Oy | Arts & recreation | 1999 |
| Kurrun Kanala Oy | Agriculture & fishing | 2003 |
| Kuutospalvelu Oy | Wholesale & retail | 2000 |
| Kyymeister Oy | Construction | 2026 |
| LVI-Asennus Kokki Oy | Construction | 1988 |
| Lvi-Jawater OY | Construction | 2017 |
| LVI-Jawapipe Oy | Construction | 2007 |
| LahtiProjekti Oy | Real estate | 2023 |
| Lammaisten Energia Oy | Energy | 1914 |
| Lastenkoti Jelperi Oy | Health & social care | 2010 |
| Lenan Taidemetalli Oy | Wholesale & retail | 2022 |
| Lentsman Palvelut Oy | Construction | 2023 |
| Liikenne Jorma Ketonen Ky | Transport & logistics | 1990 |
| Local Electric Oy | Construction | 2025 |
| Lännen Huolto ja Kunnossapito Oy | Manufacturing | 2009 |
| Lännen Talopalvelu Oy | Real estate | 2013 |
| Lännenkiinteistöt Oy | Real estate | 1978 |
| Länsi-Tamur Oy | Manufacturing | 1992 |
| Länsi-Teräs Oy | Construction | 1975 |
| M. Henttinen Oy | Transport & logistics | 1996 |
| M3M Holding Oy | Financial services | 2025 |
| MA-Rakennus J. Mäntylä Ky | Construction | 1986 |
| Mati Auto OY | Other services | 2023 |
| MECOSER Oy | Professional & scientific | 2011 |
| MN Kuljetus Oy | Transport & logistics | 2003 |
| MT-Konepalvelu Oy | Other services | 2021 |
| MVSOLUTIONS Ky | Administrative & support | 2005 |
| MaPeRa Oy | Construction | 2019 |
| Maanrakennus Jouko Kärkkänen Oy | Construction | 1992 |
| MaplePoint avoin yhtiö | Manufacturing | 2014 |
| Masina motors Oy | Wholesale & retail | 2021 |
| Matti Koskinen Oy | Wholesale & retail | 1983 |
| Merstolan Kuljetus Oy | Transport & logistics | 1994 |
| Mäntylä Forest Oy | Agriculture & fishing | 1996 |
| NV - Thermotrans Oy | Transport & logistics | 2002 |
| NakTech Oy | Administrative & support | 2026 |
| Nakkilan Hiekanjalostus Oy | Mining & quarrying | 1977 |
| Nakkilan Sähkö-Mylly Oy | Energy | 1922 |
| Niinivirta Holding Oy | Transport & logistics | 2002 |
| Nocitor Oy | Wholesale & retail | 1996 |
| Norilsk Nickel Harjavalta Oy | Manufacturing | 2000 |
| OLTU Invest Oy | Transport & logistics | 2026 |
| OMJ-Kallinen Oy | Construction | 2007 |
| Olli Mattsson Oy | Construction | 1997 |
| Olshin Oy | Construction | 2005 |
| Orastus Invest I Oy | Professional & scientific | 2008 |
| Orastus Invest Oy | Administrative & support | 2021 |
| Osuuskunta Markkinoinnin Sataverkko | Wholesale & retail | 1998 |
| Oy Finsawtec Ab | Wholesale & retail | 2001 |
| Oy Scanhomes Ltd. Finland | Wholesale & retail | 1995 |
| P & S Hakanen Oy | Administrative & support | 2018 |
| PHV- kiinteistö Oy | Real estate | 2017 |
| Painopori Kommandiittiyhtiö | Manufacturing | 1981 |
| Palalaikka Oy | Wholesale & retail | 2021 |
| Panelian Kone Oy | Manufacturing | 1991 |
| Panelian Terästyö Oy | Manufacturing | 1995 |
| Pasi Flodström Oy | Arts & recreation | 2023 |
| Patopalvelut Oy | Real estate | 2024 |
| Pekka ja Kaija avoin yhtiö | Other services | 2007 |
| Pelti-Leino Ky | Manufacturing | 1981 |
| Pentti Niinivirta Oy | Professional & scientific | 2002 |
| Pienkoti Tyllintupa Oy | Health & social care | 2003 |
| Pikakuljetus Miettinen Oy | Transport & logistics | 1981 |
| Pitkäjärven Golf Akatemia Oy | Professional & scientific | 2014 |
| Plus Katsastus Harjavalta Oy | Professional & scientific | 2015 |
| Polarprize Urheilupalkinnot Oy | Manufacturing | 1995 |
| Profitec Design Oy | Manufacturing | 2002 |
| Project Consulting Jaakkola Ky | Construction | 2022 |
| Ps Marila Oy | Other services | 2015 |
| Pulputus Oy | Health & social care | 2019 |
| Puustelli Group Oy | Manufacturing | 1999 |
| RJ Toimipalvelu Oy | Arts & recreation | 2023 |
| RL Deal OY | Wholesale & retail | 2025 |