| Forssan Ilona Advancing Oy | Professional & scientific | 2025 |
| Forssan Jama Oy | Wholesale & retail | 1998 |
| Forssan Kaivin ja Kuljetus Oy | Construction | 2008 |
| Forssan Kiinteistökauppiaat Oy | Real estate | 2014 |
| Forssan Kiinteistökeidas Oy | Real estate | 1986 |
| Forssan Kirjanpito Oy | Professional & scientific | 2016 |
| Forssan Kirjapaino Oy | Manufacturing | 1920 |
| Forssan Kulmakiinteistöt Oy | Real estate | 2017 |
| Forssan Kyllästämö U. Saarenmaa Oy | Manufacturing | 1997 |
| Forssan Kylmä-Keskus Oy | Manufacturing | 1985 |
| Forssan Käyttörengas Oy | Wholesale & retail | 2015 |
| Forssan LVI-Kulma Oy | Construction | 2007 |
| Forssan LVI-Valmiste Oy | Construction | 2003 |
| Forssan Lasitehdas Oy | Construction | 1990 |
| Forssan Lava ja Huolto Oy | Other services | 1996 |
| Forssan Levy Oy | Manufacturing | 1993 |
| Forssan Liikevartiointi Oy | Administrative & support | 1974 |
| Forssan Lukko Oy | Wholesale & retail | 1984 |
| Forssan Lumi- ja Lämpöapu Oy | Real estate | 1994 |
| Forssan Matkatoimisto Oy | Administrative & support | 1977 |
| Forssan Megamarkkinointi Avoin yhtiö | Wholesale & retail | 2017 |
| Forssan Metalliovi Oy | Real estate | 1997 |
| Forssan Metallityöt Oy | Manufacturing | 1960 |
| Forssan Monipalvelu Oy | Transport & logistics | 1993 |
| Forssan Mores Ky | Wholesale & retail | 1997 |
| Forssan Oiva Työterveys Oy | Health & social care | 2020 |
| Forssan Outlet Tapahtuma avoin yhtiö | Wholesale & retail | 2016 |
| Forssan Pee Pee Oy | Wholesale & retail | 1989 |
| Forssan Peltipalvelu Oy | Construction | 2018 |
| Forssan Piippuravintolat Oy | Hospitality | 2008 |
| Forssan Poika Ky | Wholesale & retail | 1960 |
| Forssan Putki Oy | Construction | 2016 |
| Forssan Puucenter Oy | Wholesale & retail | 2010 |
| Forssan Puunjalostamo O.Y. | Professional & scientific | 1945 |
| Forssan Puutyö Ky | Construction | 2008 |
| Forssan Rakennuskonevuokraamo Oy | Administrative & support | 1981 |
| Forssan Rakennuspystytys Oy | Construction | 1987 |
| Forssan Rengashuolto Oy | Wholesale & retail | 2023 |
| Forssan Ruosteenesto Oy | Other services | 1997 |
| Forssan Sairasautoyhtymä avoin yhtiö | Health & social care | 1971 |
| Forssan Salaman Tuki Oy | Administrative & support | 2011 |
| Forssan Sisusteasennus Ky | Manufacturing | 1987 |
| Forssan Snooker Club Oy | Financial services | 1991 |
| Forssan Soran- ja maankuljetus Oy | Transport & logistics | 1993 |
| Forssan Suojainvalmistus Oy | Manufacturing | 2020 |
| Forssan Suojapeite Oy | Manufacturing | 1993 |
| Forssan Sähködiesel Oy | Other services | 1983 |
| Forssan Säästö-aitta Oy | Financial services | 1988 |
| Forssan Säätökaluste Oy | Wholesale & retail | 2023 |
| Forssan TRT-Rakennus Oy | Construction | 1996 |
| Forssan TT-Kiinteistöt Oy | Real estate | 2018 |
| Forssan Tehokansi Oy | Other services | 1998 |
| Forssan Teräsrakenne Oy | Manufacturing | 2003 |
| Forssan Tyykikylä Oy | Professional & scientific | 2001 |
| Forssan Tyylipuku Oy | Financial services | 1980 |
| Forssan Tähti Oy | Hospitality | 2025 |
| Forssan Ullakko Oy | Professional & scientific | 2007 |
| Forssan Vahinkokuivaus Oy | Construction | 1994 |
| Forssan Valmiskaivo Oy | Manufacturing | 1981 |
| Forssan Valokopio Ky | Information & communication | 2012 |
| Forssan Varaosa ja Tarvike Ky | Wholesale & retail | 2000 |
| Forssan Verkkopalvelut Oy | Energy | 2008 |
| Forssan Viihde Oy | Hospitality | 2007 |
| Forssan Ympäristöurakointi Oy | Construction | 1999 |
| Forssan Yrittäjät Oy | Administrative & support | 2017 |
| Forssan Yrityskehitys Oy | Professional & scientific | 1996 |
| Forssan Yrityspalvelu Oy | Wholesale & retail | 1980 |
| Forssan Zeus Oy | Construction | 2023 |
| Forssan putkihitsaus ja asennus Oy | Construction | 2024 |
| Forssan toimitilavuokraus Oy | Real estate | 2021 |
| Fortema Oy | Manufacturing | 1996 |
| Forza Terra Oy | Real estate | 2025 |
| Fosa-hall KT OY | Real estate | 2019 |
| Foxa Oy | Wholesale & retail | 2021 |
| Foxmind Oy | Real estate | 2021 |
| Framion Oy | Professional & scientific | 2010 |
| Fullpaint Oy | Manufacturing | 2008 |
| Fysio Merja Oy | Health & social care | 2020 |
| Glasstower Oy | Hospitality | 2023 |
| Good Game Wellness Oy | Health & social care | 2025 |
| Graafinen Expertti Heikkilä Oy | Professional & scientific | 1995 |
| Grafors Oy | Manufacturing | 2025 |
| GreenWhale Oy | Wholesale & retail | 2008 |
| Greenmix Oy | Wholesale & retail | 1995 |
| HAMMASLABORATORIO Edent Ky | Manufacturing | 2013 |
| HH-Machine Oy | Wholesale & retail | 1999 |
| HPT-Kiinteistöt Oy | Real estate | 1989 |
| Haisio Oy | Real estate | 2003 |
| Haka-Akku, Janne Hakala Ky | Wholesale & retail | 1983 |
| Haljaste Rakennustyöt Oy | Construction | 2023 |
| Hallitilat Forssa Oy | Real estate | 2019 |
| HammasKara Oy | Health & social care | 2022 |
| Hammaslaboratorio Heinonen Oy | Manufacturing | 2001 |
| Hamsatek Oy | Construction | 2021 |
| Hannu Kaija Oy | Administrative & support | 1997 |
| Hannun Kello Oy | Wholesale & retail | 1992 |
| Hansatie Oy | Wholesale & retail | 2005 |
| Harju Clean & Consultation Oy | Other services | 2006 |
| Hautakiviliike Veljekset Rautio Oy | Manufacturing | 1990 |
| Hautaustoimisto ja Kukkakauppa, Kalevi Laine Ky | Other services | 1978 |