| Kuljetusliike E. Salo Oy | Transport & logistics | 1989 |
| Kuljetusliike H. ja J. Helén Ky | Transport & logistics | 1979 |
| Kuljetusliike Juha Eerola Oy | Transport & logistics | 1989 |
| Kuljetusliike Laurell Oy | Transport & logistics | 1996 |
| Kuljetusliike P & P Riihilahti Oy | Transport & logistics | 1980 |
| Kuuselan tupa avoin yhtiö | Hospitality | 2013 |
| L-M & J Tuomi OY | Wholesale & retail | 2006 |
| LI-Holding Oy | Manufacturing | 2005 |
| LVI-Palvelu Sarvi Oy | Construction | 2019 |
| Laatu Hinaus Oy | Transport & logistics | 2020 |
| Lammi I&V Oy | Wholesale & retail | 2026 |
| Lammin Autohuolto Oy | Wholesale & retail | 1993 |
| Lammin Betoni Oy | Manufacturing | 1977 |
| Lammin Energiahoito Ky | Health & social care | 2001 |
| Lammin Hiekkapuhallus ja Maalaus Oy | Construction | 2006 |
| Lammin Ikkuna Oy | Manufacturing | 1998 |
| Lammin Jätehuolto avoin yhtiö | Transport & logistics | 1995 |
| Lammin Kiinteistökeskus Oy | Real estate | 1995 |
| Lammin Koneosa Oy | Manufacturing | 2015 |
| Lammin LVI-Palvelu Oy | Construction | 2026 |
| Lammin LVI-asennus Simola Oy | Construction | 2014 |
| Lammin Lääkäriasema Oy | Health & social care | 2018 |
| Lammin Metallikaluste Oy | Construction | 1998 |
| Lammin Paja Oy | Financial services | 1980 |
| Lammin Pienkonehuolto Oy | Other services | 2018 |
| Lammin Pikapesula Oy | Other services | 2011 |
| Lammin Pizzeria Kebab Avoin yhtiö | Hospitality | 2005 |
| Lammin Sahti Oy | Manufacturing | 1985 |
| Lammin Siirtonurmi Oy | Administrative & support | 2012 |
| Lammin Talonmiespalvelu Oy | Administrative & support | 2000 |
| Lammin Tili- ja Toimistopalvelut Oy | Professional & scientific | 2015 |
| Lammin Traktorihuolto Oy | Other services | 2022 |
| Lammin Turvantalo Oy | Real estate | 2012 |
| Lammin Varaosa Oy | Wholesale & retail | 1990 |
| Lammin Vihtakiinteistö Oy | Real estate | 2012 |
| Lammitar Oy | Hospitality | 2018 |
| Lounas & Pitopalvelu Lammi Oy | Hospitality | 1999 |
| Lovon Oy | Construction | 2022 |
| Lumi Fire Suppression Oy | Administrative & support | 2024 |
| Luna&House oy | Hospitality | 2025 |
| MJAH Consulting Oy | Professional & scientific | 2020 |
| MP-Sähkötec Oy | Construction | 2005 |
| Maamies Jukka Oy | Transport & logistics | 2003 |
| Maanrakennus Alenius Oy | Construction | 1998 |
| Maansiirto Tyrkäs Oy | Construction | 1977 |
| Maisemaurakointi Pulkkinen Oy | Construction | 2021 |
| Makkonen & Ranta-aho Oy | Transport & logistics | 2010 |
| Manory Oy | Wholesale & retail | 2021 |
| Marraskuu 22 Oy | Hospitality | 2022 |
| Me-Me-Me Metsäpalvelut Oy | Agriculture & fishing | 2023 |
| Megavalvonta Oy | Energy | 2015 |
| Melukylä Oy | Education | 2012 |
| Metsä-Pantsar Oy | Agriculture & fishing | 1996 |
| Moniapu Salonen Oy | Administrative & support | 2017 |
| Monipalvelu Lindholm Oy | Agriculture & fishing | 2005 |
| Monipalvelu Saarinen OY | Construction | 2023 |
| Moss&Garden Oy | Administrative & support | 2020 |
| Mount Finland Oy | Administrative & support | 2007 |
| Myllyn kuppi & kakku Oy | Hospitality | 2012 |
| NK-Ryhmä Oy | Professional & scientific | 2009 |
| Niemi-Tek Oy | Construction | 2017 |
| Nordman Food Oy | Wholesale & retail | 2026 |
| Nostokuljetukset Koskinen Oy | Transport & logistics | 2012 |
| Nättilän Torppa Oy | Agriculture & fishing | 2019 |
| OiTe Oy | Health & social care | 2018 |
| Old Valley Oy | Wholesale & retail | 2024 |
| Onnenvuoren Sora Oy | Mining & quarrying | 1979 |
| Opinia Oy | Hospitality | 2016 |
| Opmel Trading Oy | Wholesale & retail | 2016 |
| Osuuskunta Kuitu 121 | Information & communication | 2023 |
| Oy Etiquette Business Coaching Ab | Education | 2016 |
| Oy Filokalia Ltd | Wholesale & retail | 2011 |
| PKJ-Huolto Ky | Other services | 2016 |
| Padankallio Oy | Health & social care | 2005 |
| Pajapellon Huolto Oy | Manufacturing | 2015 |
| Pannujärven Auto Oy | Other services | 1995 |
| Perivoli Oy | Administrative & support | 2020 |
| Perunapojat Oy | Agriculture & fishing | 2010 |
| Perustava Elementti Oy | Construction | 1994 |
| Piirtotalo Oy | Professional & scientific | 2016 |
| Pintahelmi Oy | Construction | 2017 |
| Pohjoisen Tadex Oy | Administrative & support | 2019 |
| Powerstyle Ky | Wholesale & retail | 1985 |
| Pradito Oy | Administrative & support | 1995 |
| Putkimaja Oy | Construction | 2010 |
| Puukuljetus Kalle Salo Ky | Transport & logistics | 2012 |
| Puutarhapalvelu Leena Veikkola Ky | Wholesale & retail | 1991 |
| Pöystilä & Lehtinen Oy | Real estate | 1980 |
| RAUTAVIRTAA Ky | Professional & scientific | 2008 |
| RDS Finland Oy | Construction | 2003 |
| RT Kaiverrus OY | Manufacturing | 2004 |
| Radio-Tv Westerlund Oy | Wholesale & retail | 1979 |
| Rahkio & Välikylä Oy | Education | 2013 |
| Raimo Raittinen Oy | Professional & scientific | 2001 |
| RakHe Oy | Construction | 2022 |
| Rakennus Joakim Paajanen Oy | Construction | 2023 |
| Rakennus Kerttula Oy | Construction | 2020 |
| Rakennus Raittinen Oy | Construction | 2010 |
| Rakennus Toni. M Oy | Construction | 2020 |
| Rakennusliike Mäkinen & Rantanen Oy | Construction | 2001 |