| Antti Ristolainen Holding Oy | Professional & scientific | 2020 |
| Arkkitehdit Paunila & Rautamäki Ky | Professional & scientific | 1987 |
| ArtTeijo Oy | Wholesale & retail | 2021 |
| Betaniankadun Apollo Oy | Manufacturing | 1993 |
| Clavus Oy | Construction | 2017 |
| Data-Invest Oy | Information & communication | 1986 |
| Facilus Oy | Health & social care | 2012 |
| Formare Oy | Manufacturing | 2018 |
| Greenlips Finland Oy | Wholesale & retail | 2010 |
| Hangon Graniittilinna Oy | Real estate | 1998 |
| Hotel Teijo Oy | Hospitality | 2019 |
| Infobase Towers Oy | Professional & scientific | 2000 |
| Ironwise Oy | Professional & scientific | 2005 |
| Javaction Oy | Arts & recreation | 2019 |
| Kartanonpaja Oy | Manufacturing | 2010 |
| Kiinteistö Oy Harvaluodon Majat | Real estate | 1992 |
| Kiinteistö Oy Harventajankatu 7 | Real estate | 2006 |
| Kiinteistö Oy Mathildedalin Ruukinranta | Real estate | 1994 |
| Kiinteistö Oy Meri-Teijo Marina | Real estate | 2002 |
| Kiinteistö Oy Mynämäen Katajamäki | Real estate | 1989 |
| Kiinteistö Oy Taigatupa | Real estate | 2000 |
| Kiinteistö Oy Veljekset Gustafsson | Financial services | 2001 |
| Koolle Oy | Arts & recreation | 2016 |
| Kullanpuu Oy | Hospitality | 2021 |
| Käpsä Oy | Construction | 1995 |
| LVI-Elteko Oy | Construction | 2007 |
| Malhom OY | Real estate | 1995 |
| MUKI:n vesihuolto-osuuskunta | Water & waste | 1990 |
| Madvisory Oy | Professional & scientific | 2025 |
| Makerspaceman Oy | Education | 2020 |
| Marine Alutech Oy Ab | Manufacturing | 1991 |
| Marine Alutech Service Oy | Manufacturing | 2010 |
| Mathildedalin Ruukki Oy | Real estate | 1992 |
| Matildan Pähkinä Oy | Real estate | 2005 |
| Meri-Teijo Golf Oy | Arts & recreation | 1989 |
| Millog Marine & Power Oy | Manufacturing | 1994 |
| Minnami Oy | Wholesale & retail | 2019 |
| Morite Oy | Manufacturing | 1983 |
| Nerator OY | Wholesale & retail | 2007 |
| Nordic Piping Company NPC Oy | Manufacturing | 2017 |
| Norino Invest Oy | Real estate | 2022 |
| Närhen pesä Oy | Administrative & support | 1988 |
| Oy Tykömarin Ab | Transport & logistics | 2010 |
| PK Economics Oy | Professional & scientific | 2006 |
| Perniön Muotti ja Vene, avoin yhtiö | Manufacturing | 1991 |
| Pihaksi Oy | Administrative & support | 2014 |
| Polar Diesel Oy | Wholesale & retail | 2009 |
| Praduman Nordics, Suomen sivuliike | Wholesale & retail | 2026 |
| Prokasta Oy | Professional & scientific | 2003 |
| Ruukinkartano Oy, Teijo | Real estate | 1998 |
| Saiko Oy | Professional & scientific | 2025 |
| Satya Creative Oy | Education | 2026 |
| Scalor Oy | Wholesale & retail | 2026 |
| Sigon Oy | Professional & scientific | 2026 |
| Siiko Oy | Professional & scientific | 2025 |
| Spinteco Oy | Transport & logistics | 1993 |
| Strandkrogen Oy | Hospitality | 2024 |
| Studio Sininen tila Oy | Professional & scientific | 1989 |
| Suomen Jahtimatkat Oy | Administrative & support | 2008 |
| Sähköhiltunen Oy | Construction | 1988 |
| THC OY Salo | Professional & scientific | 2021 |
| TeiSec Oy | Construction | 2021 |
| Teijo Cafe & Bakery Oy | Hospitality | 2019 |
| Teijon Halssi Ky | Wholesale & retail | 1996 |
| Teijon Kyläkauppa Oy | Wholesale & retail | 2011 |
| Teijon Manteli Ky | Wholesale & retail | 1993 |
| Teijon Masuuni Oy | Real estate | 2011 |
| Teijon Matkailu Oy | Arts & recreation | 1996 |
| Teijon Merikiinteistöt Oy | Real estate | 2022 |
| Teijon Ruukki Oy | Real estate | 2003 |
| Teijon Teollisuustuote Oy | Wholesale & retail | 1979 |
| Teijon Työkalu oy | Manufacturing | 1996 |
| Teijon sähkö Oy | Construction | 2021 |
| Teijopörssi Oy | Construction | 1989 |
| TiKazza Oy | Hospitality | 2020 |
| Tomarcon Oy | Information & communication | 1994 |
| Uniglor Oy | Construction | 2025 |
| Verroa Oy | Professional & scientific | 2025 |
| Vilniemen Valinta Ky | Wholesale & retail | 1983 |
| Wahl Enterprises Oy | Professional & scientific | 2026 |